101 files changed, 19378 insertions, 268 deletions

diff --git a/vendor/github.com/blang/semver/LICENSE b/vendor/github.com/blang/semver/LICENSE
new file mode 100644
index 0000000..5ba5c86
--- /dev/null
+++ b/vendor/github.com/blang/semver/LICENSE
@@ -0,0 +1,22 @@
+The MIT License
+
+Copyright (c) 2014 Benedikt Lang <github at benediktlang.de>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
diff --git a/vendor/github.com/blang/semver/README.md b/vendor/github.com/blang/semver/README.md
new file mode 100644
index 0000000..08b2e4a
--- /dev/null
+++ b/vendor/github.com/blang/semver/README.md
@@ -0,0 +1,194 @@
+semver for golang [![Build Status](https://travis-ci.org/blang/semver.svg?branch=master)](https://travis-ci.org/blang/semver) [![GoDoc](https://godoc.org/github.com/blang/semver?status.png)](https://godoc.org/github.com/blang/semver) [![Coverage Status](https://img.shields.io/coveralls/blang/semver.svg)](https://coveralls.io/r/blang/semver?branch=master)
+======
+
+semver is a [Semantic Versioning](http://semver.org/) library written in golang. It fully covers spec version `2.0.0`.
+
+Usage
+-----
+```bash
+$ go get github.com/blang/semver
+```
+Note: Always vendor your dependencies or fix on a specific version tag.
+
+```go
+import github.com/blang/semver
+v1, err := semver.Make("1.0.0-beta")
+v2, err := semver.Make("2.0.0-beta")
+v1.Compare(v2)
+```
+
+Also check the [GoDocs](http://godoc.org/github.com/blang/semver).
+
+Why should I use this lib?
+-----
+
+- Fully spec compatible
+- No reflection
+- No regex
+- Fully tested (Coverage >99%)
+- Readable parsing/validation errors
+- Fast (See [Benchmarks](#benchmarks))
+- Only Stdlib
+- Uses values instead of pointers
+- Many features, see below
+
+
+Features
+-----
+
+- Parsing and validation at all levels
+- Comparator-like comparisons
+- Compare Helper Methods
+- InPlace manipulation
+- Ranges `>=1.0.0 <2.0.0 || >=3.0.0 !3.0.1-beta.1`
+- Wildcards `>=1.x`, `<=2.5.x`
+- Sortable (implements sort.Interface)
+- database/sql compatible (sql.Scanner/Valuer)
+- encoding/json compatible (json.Marshaler/Unmarshaler)
+
+Ranges
+------
+
+A `Range` is a set of conditions which specify which versions satisfy the range.
+
+A condition is composed of an operator and a version. The supported operators are:
+
+- `<1.0.0` Less than `1.0.0`
+- `<=1.0.0` Less than or equal to `1.0.0`
+- `>1.0.0` Greater than `1.0.0`
+- `>=1.0.0` Greater than or equal to `1.0.0`
+- `1.0.0`, `=1.0.0`, `==1.0.0` Equal to `1.0.0`
+- `!1.0.0`, `!=1.0.0` Not equal to `1.0.0`. Excludes version `1.0.0`.
+
+Note that spaces between the operator and the version will be gracefully tolerated.
+
+A `Range` can link multiple `Ranges` separated by space:
+
+Ranges can be linked by logical AND:
+
+  - `>1.0.0 <2.0.0` would match between both ranges, so `1.1.1` and `1.8.7` but not `1.0.0` or `2.0.0`
+  - `>1.0.0 <3.0.0 !2.0.3-beta.2` would match every version between `1.0.0` and `3.0.0` except `2.0.3-beta.2`
+
+Ranges can also be linked by logical OR:
+
+  - `<2.0.0 || >=3.0.0` would match `1.x.x` and `3.x.x` but not `2.x.x`
+
+AND has a higher precedence than OR. It's not possible to use brackets.
+
+Ranges can be combined by both AND and OR
+
+  - `>1.0.0 <2.0.0 || >3.0.0 !4.2.1` would match `1.2.3`, `1.9.9`, `3.1.1`, but not `4.2.1`, `2.1.1`
+
+Range usage:
+
+```
+v, err := semver.Parse("1.2.3")
+range, err := semver.ParseRange(">1.0.0 <2.0.0 || >=3.0.0")
+if range(v) {
+    //valid
+}
+
+```
+
+Example
+-----
+
+Have a look at full examples in [examples/main.go](examples/main.go)
+
+```go
+import github.com/blang/semver
+
+v, err := semver.Make("0.0.1-alpha.preview+123.github")
+fmt.Printf("Major: %d\n", v.Major)
+fmt.Printf("Minor: %d\n", v.Minor)
+fmt.Printf("Patch: %d\n", v.Patch)
+fmt.Printf("Pre: %s\n", v.Pre)
+fmt.Printf("Build: %s\n", v.Build)
+
+// Prerelease versions array
+if len(v.Pre) > 0 {
+    fmt.Println("Prerelease versions:")
+    for i, pre := range v.Pre {
+        fmt.Printf("%d: %q\n", i, pre)
+    }
+}
+
+// Build meta data array
+if len(v.Build) > 0 {
+    fmt.Println("Build meta data:")
+    for i, build := range v.Build {
+        fmt.Printf("%d: %q\n", i, build)
+    }
+}
+
+v001, err := semver.Make("0.0.1")
+// Compare using helpers: v.GT(v2), v.LT, v.GTE, v.LTE
+v001.GT(v) == true
+v.LT(v001) == true
+v.GTE(v) == true
+v.LTE(v) == true
+
+// Or use v.Compare(v2) for comparisons (-1, 0, 1):
+v001.Compare(v) == 1
+v.Compare(v001) == -1
+v.Compare(v) == 0
+
+// Manipulate Version in place:
+v.Pre[0], err = semver.NewPRVersion("beta")
+if err != nil {
+    fmt.Printf("Error parsing pre release version: %q", err)
+}
+
+fmt.Println("\nValidate versions:")
+v.Build[0] = "?"
+
+err = v.Validate()
+if err != nil {
+    fmt.Printf("Validation failed: %s\n", err)
+}
+```
+
+
+Benchmarks
+-----
+
+    BenchmarkParseSimple-4           5000000    390    ns/op    48 B/op   1 allocs/op
+    BenchmarkParseComplex-4          1000000   1813    ns/op   256 B/op   7 allocs/op
+    BenchmarkParseAverage-4          1000000   1171    ns/op   163 B/op   4 allocs/op
+    BenchmarkStringSimple-4         20000000    119    ns/op    16 B/op   1 allocs/op
+    BenchmarkStringLarger-4         10000000    206    ns/op    32 B/op   2 allocs/op
+    BenchmarkStringComplex-4         5000000    324    ns/op    80 B/op   3 allocs/op
+    BenchmarkStringAverage-4         5000000    273    ns/op    53 B/op   2 allocs/op
+    BenchmarkValidateSimple-4      200000000      9.33 ns/op     0 B/op   0 allocs/op
+    BenchmarkValidateComplex-4       3000000    469    ns/op     0 B/op   0 allocs/op
+    BenchmarkValidateAverage-4       5000000    256    ns/op     0 B/op   0 allocs/op
+    BenchmarkCompareSimple-4       100000000     11.8  ns/op     0 B/op   0 allocs/op
+    BenchmarkCompareComplex-4       50000000     30.8  ns/op     0 B/op   0 allocs/op
+    BenchmarkCompareAverage-4       30000000     41.5  ns/op     0 B/op   0 allocs/op
+    BenchmarkSort-4                  3000000    419    ns/op   256 B/op   2 allocs/op
+    BenchmarkRangeParseSimple-4      2000000    850    ns/op   192 B/op   5 allocs/op
+    BenchmarkRangeParseAverage-4     1000000   1677    ns/op   400 B/op  10 allocs/op
+    BenchmarkRangeParseComplex-4      300000   5214    ns/op  1440 B/op  30 allocs/op
+    BenchmarkRangeMatchSimple-4     50000000     25.6  ns/op     0 B/op   0 allocs/op
+    BenchmarkRangeMatchAverage-4    30000000     56.4  ns/op     0 B/op   0 allocs/op
+    BenchmarkRangeMatchComplex-4    10000000    153    ns/op     0 B/op   0 allocs/op
+
+See benchmark cases at [semver_test.go](semver_test.go)
+
+
+Motivation
+-----
+
+I simply couldn't find any lib supporting the full spec. Others were just wrong or used reflection and regex which i don't like.
+
+
+Contribution
+-----
+
+Feel free to make a pull request. For bigger changes create a issue first to discuss about it.
+
+
+License
+-----
+
+See [LICENSE](LICENSE) file.
diff --git a/vendor/github.com/blang/semver/json.go b/vendor/github.com/blang/semver/json.go
new file mode 100644
index 0000000..a74bf7c
--- /dev/null
+++ b/vendor/github.com/blang/semver/json.go
@@ -0,0 +1,23 @@
+package semver
+
+import (
+        "encoding/json"
+)
+
+// MarshalJSON implements the encoding/json.Marshaler interface.
+func (v Version) MarshalJSON() ([]byte, error) {
+        return json.Marshal(v.String())
+}
+
+// UnmarshalJSON implements the encoding/json.Unmarshaler interface.
+func (v *Version) UnmarshalJSON(data []byte) (err error) {
+        var versionString string
+
+        if err = json.Unmarshal(data, &versionString); err != nil {
+                return
+        }
+
+        *v, err = Parse(versionString)
+
+        return
+}
diff --git a/vendor/github.com/blang/semver/package.json b/vendor/github.com/blang/semver/package.json
new file mode 100644
index 0000000..1cf8ebd
--- /dev/null
+++ b/vendor/github.com/blang/semver/package.json
@@ -0,0 +1,17 @@
+{
+  "author": "blang",
+  "bugs": {
+    "URL": "https://github.com/blang/semver/issues",
+    "url": "https://github.com/blang/semver/issues"
+  },
+  "gx": {
+    "dvcsimport": "github.com/blang/semver"
+  },
+  "gxVersion": "0.10.0",
+  "language": "go",
+  "license": "MIT",
+  "name": "semver",
+  "releaseCmd": "git commit -a -m \"gx publish $VERSION\"",
+  "version": "3.5.1"
+}
+
diff --git a/vendor/github.com/blang/semver/range.go b/vendor/github.com/blang/semver/range.go
new file mode 100644
index 0000000..fca406d
--- /dev/null
+++ b/vendor/github.com/blang/semver/range.go
@@ -0,0 +1,416 @@
+package semver
+
+import (
+        "fmt"
+        "strconv"
+        "strings"
+        "unicode"
+)
+
+type wildcardType int
+
+const (
+        noneWildcard  wildcardType = iota
+        majorWildcard wildcardType = 1
+        minorWildcard wildcardType = 2
+        patchWildcard wildcardType = 3
+)
+
+func wildcardTypefromInt(i int) wildcardType {
+        switch i {
+        case 1:
+                return majorWildcard
+        case 2:
+                return minorWildcard
+        case 3:
+                return patchWildcard
+        default:
+                return noneWildcard
+        }
+}
+
+type comparator func(Version, Version) bool
+
+var (
+        compEQ comparator = func(v1 Version, v2 Version) bool {
+                return v1.Compare(v2) == 0
+        }
+        compNE = func(v1 Version, v2 Version) bool {
+                return v1.Compare(v2) != 0
+        }
+        compGT = func(v1 Version, v2 Version) bool {
+                return v1.Compare(v2) == 1
+        }
+        compGE = func(v1 Version, v2 Version) bool {
+                return v1.Compare(v2) >= 0
+        }
+        compLT = func(v1 Version, v2 Version) bool {
+                return v1.Compare(v2) == -1
+        }
+        compLE = func(v1 Version, v2 Version) bool {
+                return v1.Compare(v2) <= 0
+        }
+)
+
+type versionRange struct {
+        v Version
+        c comparator
+}
+
+// rangeFunc creates a Range from the given versionRange.
+func (vr *versionRange) rangeFunc() Range {
+        return Range(func(v Version) bool {
+                return vr.c(v, vr.v)
+        })
+}
+
+// Range represents a range of versions.
+// A Range can be used to check if a Version satisfies it:
+//
+//     range, err := semver.ParseRange(">1.0.0 <2.0.0")
+//     range(semver.MustParse("1.1.1") // returns true
+type Range func(Version) bool
+
+// OR combines the existing Range with another Range using logical OR.
+func (rf Range) OR(f Range) Range {
+        return Range(func(v Version) bool {
+                return rf(v) || f(v)
+        })
+}
+
+// AND combines the existing Range with another Range using logical AND.
+func (rf Range) AND(f Range) Range {
+        return Range(func(v Version) bool {
+                return rf(v) && f(v)
+        })
+}
+
+// ParseRange parses a range and returns a Range.
+// If the range could not be parsed an error is returned.
+//
+// Valid ranges are:
+//   - "<1.0.0"
+//   - "<=1.0.0"
+//   - ">1.0.0"
+//   - ">=1.0.0"
+//   - "1.0.0", "=1.0.0", "==1.0.0"
+//   - "!1.0.0", "!=1.0.0"
+//
+// A Range can consist of multiple ranges separated by space:
+// Ranges can be linked by logical AND:
+//   - ">1.0.0 <2.0.0" would match between both ranges, so "1.1.1" and "1.8.7" but not "1.0.0" or "2.0.0"
+//   - ">1.0.0 <3.0.0 !2.0.3-beta.2" would match every version between 1.0.0 and 3.0.0 except 2.0.3-beta.2
+//
+// Ranges can also be linked by logical OR:
+//   - "<2.0.0 || >=3.0.0" would match "1.x.x" and "3.x.x" but not "2.x.x"
+//
+// AND has a higher precedence than OR. It's not possible to use brackets.
+//
+// Ranges can be combined by both AND and OR
+//
+//  - `>1.0.0 <2.0.0 || >3.0.0 !4.2.1` would match `1.2.3`, `1.9.9`, `3.1.1`, but not `4.2.1`, `2.1.1`
+func ParseRange(s string) (Range, error) {
+        parts := splitAndTrim(s)
+        orParts, err := splitORParts(parts)
+        if err != nil {
+                return nil, err
+        }
+        expandedParts, err := expandWildcardVersion(orParts)
+        if err != nil {
+                return nil, err
+        }
+        var orFn Range
+        for _, p := range expandedParts {
+                var andFn Range
+                for _, ap := range p {
+                        opStr, vStr, err := splitComparatorVersion(ap)
+                        if err != nil {
+                                return nil, err
+                        }
+                        vr, err := buildVersionRange(opStr, vStr)
+                        if err != nil {
+                                return nil, fmt.Errorf("Could not parse Range %q: %s", ap, err)
+                        }
+                        rf := vr.rangeFunc()
+
+                        // Set function
+                        if andFn == nil {
+                                andFn = rf
+                        } else { // Combine with existing function
+                                andFn = andFn.AND(rf)
+                        }
+                }
+                if orFn == nil {
+                        orFn = andFn
+                } else {
+                        orFn = orFn.OR(andFn)
+                }
+
+        }
+        return orFn, nil
+}
+
+// splitORParts splits the already cleaned parts by '||'.
+// Checks for invalid positions of the operator and returns an
+// error if found.
+func splitORParts(parts []string) ([][]string, error) {
+        var ORparts [][]string
+        last := 0
+        for i, p := range parts {
+                if p == "||" {
+                        if i == 0 {
+                                return nil, fmt.Errorf("First element in range is '||'")
+                        }
+                        ORparts = append(ORparts, parts[last:i])
+                        last = i + 1
+                }
+        }
+        if last == len(parts) {
+                return nil, fmt.Errorf("Last element in range is '||'")
+        }
+        ORparts = append(ORparts, parts[last:])
+        return ORparts, nil
+}
+
+// buildVersionRange takes a slice of 2: operator and version
+// and builds a versionRange, otherwise an error.
+func buildVersionRange(opStr, vStr string) (*versionRange, error) {
+        c := parseComparator(opStr)
+        if c == nil {
+                return nil, fmt.Errorf("Could not parse comparator %q in %q", opStr, strings.Join([]string{opStr, vStr}, ""))
+        }
+        v, err := Parse(vStr)
+        if err != nil {
+                return nil, fmt.Errorf("Could not parse version %q in %q: %s", vStr, strings.Join([]string{opStr, vStr}, ""), err)
+        }
+
+        return &versionRange{
+                v: v,
+                c: c,
+        }, nil
+
+}
+
+// inArray checks if a byte is contained in an array of bytes
+func inArray(s byte, list []byte) bool {
+        for _, el := range list {
+                if el == s {
+                        return true
+                }
+        }
+        return false
+}
+
+// splitAndTrim splits a range string by spaces and cleans whitespaces
+func splitAndTrim(s string) (result []string) {
+        last := 0
+        var lastChar byte
+        excludeFromSplit := []byte{'>', '<', '='}
+        for i := 0; i < len(s); i++ {
+                if s[i] == ' ' && !inArray(lastChar, excludeFromSplit) {
+                        if last < i-1 {
+                                result = append(result, s[last:i])
+                        }
+                        last = i + 1
+                } else if s[i] != ' ' {
+                        lastChar = s[i]
+                }
+        }
+        if last < len(s)-1 {
+                result = append(result, s[last:])
+        }
+
+        for i, v := range result {
+                result[i] = strings.Replace(v, " ", "", -1)
+        }
+
+        // parts := strings.Split(s, " ")
+        // for _, x := range parts {
+        //      if s := strings.TrimSpace(x); len(s) != 0 {
+        //              result = append(result, s)
+        //      }
+        // }
+        return
+}
+
+// splitComparatorVersion splits the comparator from the version.
+// Input must be free of leading or trailing spaces.
+func splitComparatorVersion(s string) (string, string, error) {
+        i := strings.IndexFunc(s, unicode.IsDigit)
+        if i == -1 {
+                return "", "", fmt.Errorf("Could not get version from string: %q", s)
+        }
+        return strings.TrimSpace(s[0:i]), s[i:], nil
+}
+
+// getWildcardType will return the type of wildcard that the
+// passed version contains
+func getWildcardType(vStr string) wildcardType {
+        parts := strings.Split(vStr, ".")
+        nparts := len(parts)
+        wildcard := parts[nparts-1]
+
+        possibleWildcardType := wildcardTypefromInt(nparts)
+        if wildcard == "x" {
+                return possibleWildcardType
+        }
+
+        return noneWildcard
+}
+
+// createVersionFromWildcard will convert a wildcard version
+// into a regular version, replacing 'x's with '0's, handling
+// special cases like '1.x.x' and '1.x'
+func createVersionFromWildcard(vStr string) string {
+        // handle 1.x.x
+        vStr2 := strings.Replace(vStr, ".x.x", ".x", 1)
+        vStr2 = strings.Replace(vStr2, ".x", ".0", 1)
+        parts := strings.Split(vStr2, ".")
+
+        // handle 1.x
+        if len(parts) == 2 {
+                return vStr2 + ".0"
+        }
+
+        return vStr2
+}
+
+// incrementMajorVersion will increment the major version
+// of the passed version
+func incrementMajorVersion(vStr string) (string, error) {
+        parts := strings.Split(vStr, ".")
+        i, err := strconv.Atoi(parts[0])
+        if err != nil {
+                return "", err
+        }
+        parts[0] = strconv.Itoa(i + 1)
+
+        return strings.Join(parts, "."), nil
+}
+
+// incrementMajorVersion will increment the minor version
+// of the passed version
+func incrementMinorVersion(vStr string) (string, error) {
+        parts := strings.Split(vStr, ".")
+        i, err := strconv.Atoi(parts[1])
+        if err != nil {
+                return "", err
+        }
+        parts[1] = strconv.Itoa(i + 1)
+
+        return strings.Join(parts, "."), nil
+}
+
+// expandWildcardVersion will expand wildcards inside versions
+// following these rules:
+//
+// * when dealing with patch wildcards:
+// >= 1.2.x    will become    >= 1.2.0
+// <= 1.2.x    will become    <  1.3.0
+// >  1.2.x    will become    >= 1.3.0
+// <  1.2.x    will become    <  1.2.0
+// != 1.2.x    will become    <  1.2.0 >= 1.3.0
+//
+// * when dealing with minor wildcards:
+// >= 1.x      will become    >= 1.0.0
+// <= 1.x      will become    <  2.0.0
+// >  1.x      will become    >= 2.0.0
+// <  1.0      will become    <  1.0.0
+// != 1.x      will become    <  1.0.0 >= 2.0.0
+//
+// * when dealing with wildcards without
+// version operator:
+// 1.2.x       will become    >= 1.2.0 < 1.3.0
+// 1.x         will become    >= 1.0.0 < 2.0.0
+func expandWildcardVersion(parts [][]string) ([][]string, error) {
+        var expandedParts [][]string
+        for _, p := range parts {
+                var newParts []string
+                for _, ap := range p {
+                        if strings.Index(ap, "x") != -1 {
+                                opStr, vStr, err := splitComparatorVersion(ap)
+                                if err != nil {
+                                        return nil, err
+                                }
+
+                                versionWildcardType := getWildcardType(vStr)
+                                flatVersion := createVersionFromWildcard(vStr)
+
+                                var resultOperator string
+                                var shouldIncrementVersion bool
+                                switch opStr {
+                                case ">":
+                                        resultOperator = ">="
+                                        shouldIncrementVersion = true
+                                case ">=":
+                                        resultOperator = ">="
+                                case "<":
+                                        resultOperator = "<"
+                                case "<=":
+                                        resultOperator = "<"
+                                        shouldIncrementVersion = true
+                                case "", "=", "==":
+                                        newParts = append(newParts, ">="+flatVersion)
+                                        resultOperator = "<"
+                                        shouldIncrementVersion = true
+                                case "!=", "!":
+                                        newParts = append(newParts, "<"+flatVersion)
+                                        resultOperator = ">="
+                                        shouldIncrementVersion = true
+                                }
+
+                                var resultVersion string
+                                if shouldIncrementVersion {
+                                        switch versionWildcardType {
+                                        case patchWildcard:
+                                                resultVersion, _ = incrementMinorVersion(flatVersion)
+                                        case minorWildcard:
+                                                resultVersion, _ = incrementMajorVersion(flatVersion)
+                                        }
+                                } else {
+                                        resultVersion = flatVersion
+                                }
+
+                                ap = resultOperator + resultVersion
+                        }
+                        newParts = append(newParts, ap)
+                }
+                expandedParts = append(expandedParts, newParts)
+        }
+
+        return expandedParts, nil
+}
+
+func parseComparator(s string) comparator {
+        switch s {
+        case "==":
+                fallthrough
+        case "":
+                fallthrough
+        case "=":
+                return compEQ
+        case ">":
+                return compGT
+        case ">=":
+                return compGE
+        case "<":
+                return compLT
+        case "<=":
+                return compLE
+        case "!":
+                fallthrough
+        case "!=":
+                return compNE
+        }
+
+        return nil
+}
+
+// MustParseRange is like ParseRange but panics if the range cannot be parsed.
+func MustParseRange(s string) Range {
+        r, err := ParseRange(s)
+        if err != nil {
+                panic(`semver: ParseRange(` + s + `): ` + err.Error())
+        }
+        return r
+}
diff --git a/vendor/github.com/blang/semver/semver.go b/vendor/github.com/blang/semver/semver.go
new file mode 100644
index 0000000..8ee0842
--- /dev/null
+++ b/vendor/github.com/blang/semver/semver.go
@@ -0,0 +1,418 @@
+package semver
+
+import (
+        "errors"
+        "fmt"
+        "strconv"
+        "strings"
+)
+
+const (
+        numbers  string = "0123456789"
+        alphas          = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-"
+        alphanum        = alphas + numbers
+)
+
+// SpecVersion is the latest fully supported spec version of semver
+var SpecVersion = Version{
+        Major: 2,
+        Minor: 0,
+        Patch: 0,
+}
+
+// Version represents a semver compatible version
+type Version struct {
+        Major uint64
+        Minor uint64
+        Patch uint64
+        Pre   []PRVersion
+        Build []string //No Precendence
+}
+
+// Version to string
+func (v Version) String() string {
+        b := make([]byte, 0, 5)
+        b = strconv.AppendUint(b, v.Major, 10)
+        b = append(b, '.')
+        b = strconv.AppendUint(b, v.Minor, 10)
+        b = append(b, '.')
+        b = strconv.AppendUint(b, v.Patch, 10)
+
+        if len(v.Pre) > 0 {
+                b = append(b, '-')
+                b = append(b, v.Pre[0].String()...)
+
+                for _, pre := range v.Pre[1:] {
+                        b = append(b, '.')
+                        b = append(b, pre.String()...)
+                }
+        }
+
+        if len(v.Build) > 0 {
+                b = append(b, '+')
+                b = append(b, v.Build[0]...)
+
+                for _, build := range v.Build[1:] {
+                        b = append(b, '.')
+                        b = append(b, build...)
+                }
+        }
+
+        return string(b)
+}
+
+// Equals checks if v is equal to o.
+func (v Version) Equals(o Version) bool {
+        return (v.Compare(o) == 0)
+}
+
+// EQ checks if v is equal to o.
+func (v Version) EQ(o Version) bool {
+        return (v.Compare(o) == 0)
+}
+
+// NE checks if v is not equal to o.
+func (v Version) NE(o Version) bool {
+        return (v.Compare(o) != 0)
+}
+
+// GT checks if v is greater than o.
+func (v Version) GT(o Version) bool {
+        return (v.Compare(o) == 1)
+}
+
+// GTE checks if v is greater than or equal to o.
+func (v Version) GTE(o Version) bool {
+        return (v.Compare(o) >= 0)
+}
+
+// GE checks if v is greater than or equal to o.
+func (v Version) GE(o Version) bool {
+        return (v.Compare(o) >= 0)
+}
+
+// LT checks if v is less than o.
+func (v Version) LT(o Version) bool {
+        return (v.Compare(o) == -1)
+}
+
+// LTE checks if v is less than or equal to o.
+func (v Version) LTE(o Version) bool {
+        return (v.Compare(o) <= 0)
+}
+
+// LE checks if v is less than or equal to o.
+func (v Version) LE(o Version) bool {
+        return (v.Compare(o) <= 0)
+}
+
+// Compare compares Versions v to o:
+// -1 == v is less than o
+// 0 == v is equal to o
+// 1 == v is greater than o
+func (v Version) Compare(o Version) int {
+        if v.Major != o.Major {
+                if v.Major > o.Major {
+                        return 1
+                }
+                return -1
+        }
+        if v.Minor != o.Minor {
+                if v.Minor > o.Minor {
+                        return 1
+                }
+                return -1
+        }
+        if v.Patch != o.Patch {
+                if v.Patch > o.Patch {
+                        return 1
+                }
+                return -1
+        }
+
+        // Quick comparison if a version has no prerelease versions
+        if len(v.Pre) == 0 && len(o.Pre) == 0 {
+                return 0
+        } else if len(v.Pre) == 0 && len(o.Pre) > 0 {
+                return 1
+        } else if len(v.Pre) > 0 && len(o.Pre) == 0 {
+                return -1
+        }
+
+        i := 0
+        for ; i < len(v.Pre) && i < len(o.Pre); i++ {
+                if comp := v.Pre[i].Compare(o.Pre[i]); comp == 0 {
+                        continue
+                } else if comp == 1 {
+                        return 1
+                } else {
+                        return -1
+                }
+        }
+
+        // If all pr versions are the equal but one has further prversion, this one greater
+        if i == len(v.Pre) && i == len(o.Pre) {
+                return 0
+        } else if i == len(v.Pre) && i < len(o.Pre) {
+                return -1
+        } else {
+                return 1
+        }
+
+}
+
+// Validate validates v and returns error in case
+func (v Version) Validate() error {
+        // Major, Minor, Patch already validated using uint64
+
+        for _, pre := range v.Pre {
+                if !pre.IsNum { //Numeric prerelease versions already uint64
+                        if len(pre.VersionStr) == 0 {
+                                return fmt.Errorf("Prerelease can not be empty %q", pre.VersionStr)
+                        }
+                        if !containsOnly(pre.VersionStr, alphanum) {
+                                return fmt.Errorf("Invalid character(s) found in prerelease %q", pre.VersionStr)
+                        }
+                }
+        }
+
+        for _, build := range v.Build {
+                if len(build) == 0 {
+                        return fmt.Errorf("Build meta data can not be empty %q", build)
+                }
+                if !containsOnly(build, alphanum) {
+                        return fmt.Errorf("Invalid character(s) found in build meta data %q", build)
+                }
+        }
+
+        return nil
+}
+
+// New is an alias for Parse and returns a pointer, parses version string and returns a validated Version or error
+func New(s string) (vp *Version, err error) {
+        v, err := Parse(s)
+        vp = &v
+        return
+}
+
+// Make is an alias for Parse, parses version string and returns a validated Version or error
+func Make(s string) (Version, error) {
+        return Parse(s)
+}
+
+// ParseTolerant allows for certain version specifications that do not strictly adhere to semver
+// specs to be parsed by this library. It does so by normalizing versions before passing them to
+// Parse(). It currently trims spaces, removes a "v" prefix, and adds a 0 patch number to versions
+// with only major and minor components specified
+func ParseTolerant(s string) (Version, error) {
+        s = strings.TrimSpace(s)
+        s = strings.TrimPrefix(s, "v")
+
+        // Split into major.minor.(patch+pr+meta)
+        parts := strings.SplitN(s, ".", 3)
+        if len(parts) < 3 {
+                if strings.ContainsAny(parts[len(parts)-1], "+-") {
+                        return Version{}, errors.New("Short version cannot contain PreRelease/Build meta data")
+                }
+                for len(parts) < 3 {
+                        parts = append(parts, "0")
+                }
+                s = strings.Join(parts, ".")
+        }
+
+        return Parse(s)
+}
+
+// Parse parses version string and returns a validated Version or error
+func Parse(s string) (Version, error) {
+        if len(s) == 0 {
+                return Version{}, errors.New("Version string empty")
+        }
+
+        // Split into major.minor.(patch+pr+meta)
+        parts := strings.SplitN(s, ".", 3)
+        if len(parts) != 3 {
+                return Version{}, errors.New("No Major.Minor.Patch elements found")
+        }
+
+        // Major
+        if !containsOnly(parts[0], numbers) {
+                return Version{}, fmt.Errorf("Invalid character(s) found in major number %q", parts[0])
+        }
+        if hasLeadingZeroes(parts[0]) {
+                return Version{}, fmt.Errorf("Major number must not contain leading zeroes %q", parts[0])
+        }
+        major, err := strconv.ParseUint(parts[0], 10, 64)
+        if err != nil {
+                return Version{}, err
+        }
+
+        // Minor
+        if !containsOnly(parts[1], numbers) {
+                return Version{}, fmt.Errorf("Invalid character(s) found in minor number %q", parts[1])
+        }
+        if hasLeadingZeroes(parts[1]) {
+                return Version{}, fmt.Errorf("Minor number must not contain leading zeroes %q", parts[1])
+        }
+        minor, err := strconv.ParseUint(parts[1], 10, 64)
+        if err != nil {
+                return Version{}, err
+        }
+
+        v := Version{}
+        v.Major = major
+        v.Minor = minor
+
+        var build, prerelease []string
+        patchStr := parts[2]
+
+        if buildIndex := strings.IndexRune(patchStr, '+'); buildIndex != -1 {
+                build = strings.Split(patchStr[buildIndex+1:], ".")
+                patchStr = patchStr[:buildIndex]
+        }
+
+        if preIndex := strings.IndexRune(patchStr, '-'); preIndex != -1 {
+                prerelease = strings.Split(patchStr[preIndex+1:], ".")
+                patchStr = patchStr[:preIndex]
+        }
+
+        if !containsOnly(patchStr, numbers) {
+                return Version{}, fmt.Errorf("Invalid character(s) found in patch number %q", patchStr)
+        }
+        if hasLeadingZeroes(patchStr) {
+                return Version{}, fmt.Errorf("Patch number must not contain leading zeroes %q", patchStr)
+        }
+        patch, err := strconv.ParseUint(patchStr, 10, 64)
+        if err != nil {
+                return Version{}, err
+        }
+
+        v.Patch = patch
+
+        // Prerelease
+        for _, prstr := range prerelease {
+                parsedPR, err := NewPRVersion(prstr)
+                if err != nil {
+                        return Version{}, err
+                }
+                v.Pre = append(v.Pre, parsedPR)
+        }
+
+        // Build meta data
+        for _, str := range build {
+                if len(str) == 0 {
+                        return Version{}, errors.New("Build meta data is empty")
+                }
+                if !containsOnly(str, alphanum) {
+                        return Version{}, fmt.Errorf("Invalid character(s) found in build meta data %q", str)
+                }
+                v.Build = append(v.Build, str)
+        }
+
+        return v, nil
+}
+
+// MustParse is like Parse but panics if the version cannot be parsed.
+func MustParse(s string) Version {
+        v, err := Parse(s)
+        if err != nil {
+                panic(`semver: Parse(` + s + `): ` + err.Error())
+        }
+        return v
+}
+
+// PRVersion represents a PreRelease Version
+type PRVersion struct {
+        VersionStr string
+        VersionNum uint64
+        IsNum      bool
+}
+
+// NewPRVersion creates a new valid prerelease version
+func NewPRVersion(s string) (PRVersion, error) {
+        if len(s) == 0 {
+                return PRVersion{}, errors.New("Prerelease is empty")
+        }
+        v := PRVersion{}
+        if containsOnly(s, numbers) {
+                if hasLeadingZeroes(s) {
+                        return PRVersion{}, fmt.Errorf("Numeric PreRelease version must not contain leading zeroes %q", s)
+                }
+                num, err := strconv.ParseUint(s, 10, 64)
+
+                // Might never be hit, but just in case
+                if err != nil {
+                        return PRVersion{}, err
+                }
+                v.VersionNum = num
+                v.IsNum = true
+        } else if containsOnly(s, alphanum) {
+                v.VersionStr = s
+                v.IsNum = false
+        } else {
+                return PRVersion{}, fmt.Errorf("Invalid character(s) found in prerelease %q", s)
+        }
+        return v, nil
+}
+
+// IsNumeric checks if prerelease-version is numeric
+func (v PRVersion) IsNumeric() bool {
+        return v.IsNum
+}
+
+// Compare compares two PreRelease Versions v and o:
+// -1 == v is less than o
+// 0 == v is equal to o
+// 1 == v is greater than o
+func (v PRVersion) Compare(o PRVersion) int {
+        if v.IsNum && !o.IsNum {
+                return -1
+        } else if !v.IsNum && o.IsNum {
+                return 1
+        } else if v.IsNum && o.IsNum {
+                if v.VersionNum == o.VersionNum {
+                        return 0
+                } else if v.VersionNum > o.VersionNum {
+                        return 1
+                } else {
+                        return -1
+                }
+        } else { // both are Alphas
+                if v.VersionStr == o.VersionStr {
+                        return 0
+                } else if v.VersionStr > o.VersionStr {
+                        return 1
+                } else {
+                        return -1
+                }
+        }
+}
+
+// PreRelease version to string
+func (v PRVersion) String() string {
+        if v.IsNum {
+                return strconv.FormatUint(v.VersionNum, 10)
+        }
+        return v.VersionStr
+}
+
+func containsOnly(s string, set string) bool {
+        return strings.IndexFunc(s, func(r rune) bool {
+                return !strings.ContainsRune(set, r)
+        }) == -1
+}
+
+func hasLeadingZeroes(s string) bool {
+        return len(s) > 1 && s[0] == '0'
+}
+
+// NewBuildVersion creates a new valid build version
+func NewBuildVersion(s string) (string, error) {
+        if len(s) == 0 {
+                return "", errors.New("Buildversion is empty")
+        }
+        if !containsOnly(s, alphanum) {
+                return "", fmt.Errorf("Invalid character(s) found in build meta data %q", s)
+        }
+        return s, nil
+}
diff --git a/vendor/github.com/blang/semver/sort.go b/vendor/github.com/blang/semver/sort.go
new file mode 100644
index 0000000..e18f880
--- /dev/null
+++ b/vendor/github.com/blang/semver/sort.go
@@ -0,0 +1,28 @@
+package semver
+
+import (
+        "sort"
+)
+
+// Versions represents multiple versions.
+type Versions []Version
+
+// Len returns length of version collection
+func (s Versions) Len() int {
+        return len(s)
+}
+
+// Swap swaps two versions inside the collection by its indices
+func (s Versions) Swap(i, j int) {
+        s[i], s[j] = s[j], s[i]
+}
+
+// Less checks if version at index i is less than version at index j
+func (s Versions) Less(i, j int) bool {
+        return s[i].LT(s[j])
+}
+
+// Sort sorts a slice of versions
+func Sort(versions []Version) {
+        sort.Sort(Versions(versions))
+}
diff --git a/vendor/github.com/blang/semver/sql.go b/vendor/github.com/blang/semver/sql.go
new file mode 100644
index 0000000..eb4d802
--- /dev/null
+++ b/vendor/github.com/blang/semver/sql.go
@@ -0,0 +1,30 @@
+package semver
+
+import (
+        "database/sql/driver"
+        "fmt"
+)
+
+// Scan implements the database/sql.Scanner interface.
+func (v *Version) Scan(src interface{}) (err error) {
+        var str string
+        switch src := src.(type) {
+        case string:
+                str = src
+        case []byte:
+                str = string(src)
+        default:
+                return fmt.Errorf("Version.Scan: cannot convert %T to string.", src)
+        }
+
+        if t, err := Parse(str); err == nil {
+                *v = t
+        }
+
+        return
+}
+
+// Value implements the database/sql/driver.Valuer interface.
+func (v Version) Value() (driver.Value, error) {
+        return v.String(), nil
+}
diff --git a/vendor/github.com/hashicorp/go-cleanhttp/LICENSE b/vendor/github.com/hashicorp/go-cleanhttp/LICENSE
new file mode 100644
index 0000000..e87a115
--- /dev/null
+++ b/vendor/github.com/hashicorp/go-cleanhttp/LICENSE
@@ -0,0 +1,363 @@
+Mozilla Public License, version 2.0
+
+1. Definitions
+
+1.1. "Contributor"
+
+     means each individual or legal entity that creates, contributes to the
+     creation of, or owns Covered Software.
+
+1.2. "Contributor Version"
+
+     means the combination of the Contributions of others (if any) used by a
+     Contributor and that particular Contributor's Contribution.
+
+1.3. "Contribution"
+
+     means Covered Software of a particular Contributor.
+
+1.4. "Covered Software"
+
+     means Source Code Form to which the initial Contributor has attached the
+     notice in Exhibit A, the Executable Form of such Source Code Form, and
+     Modifications of such Source Code Form, in each case including portions
+     thereof.
+
+1.5. "Incompatible With Secondary Licenses"
+     means
+
+     a. that the initial Contributor has attached the notice described in
+        Exhibit B to the Covered Software; or
+
+     b. that the Covered Software was made available under the terms of
+        version 1.1 or earlier of the License, but not also under the terms of
+        a Secondary License.
+
+1.6. "Executable Form"
+
+     means any form of the work other than Source Code Form.
+
+1.7. "Larger Work"
+
+     means a work that combines Covered Software with other material, in a
+     separate file or files, that is not Covered Software.
+
+1.8. "License"
+
+     means this document.
+
+1.9. "Licensable"
+
+     means having the right to grant, to the maximum extent possible, whether
+     at the time of the initial grant or subsequently, any and all of the
+     rights conveyed by this License.
+
+1.10. "Modifications"
+
+     means any of the following:
+
+     a. any file in Source Code Form that results from an addition to,
+        deletion from, or modification of the contents of Covered Software; or
+
+     b. any new file in Source Code Form that contains any Covered Software.
+
+1.11. "Patent Claims" of a Contributor
+
+      means any patent claim(s), including without limitation, method,
+      process, and apparatus claims, in any patent Licensable by such
+      Contributor that would be infringed, but for the grant of the License,
+      by the making, using, selling, offering for sale, having made, import,
+      or transfer of either its Contributions or its Contributor Version.
+
+1.12. "Secondary License"
+
+      means either the GNU General Public License, Version 2.0, the GNU Lesser
+      General Public License, Version 2.1, the GNU Affero General Public
+      License, Version 3.0, or any later versions of those licenses.
+
+1.13. "Source Code Form"
+
+      means the form of the work preferred for making modifications.
+
+1.14. "You" (or "Your")
+
+      means an individual or a legal entity exercising rights under this
+      License. For legal entities, "You" includes any entity that controls, is
+      controlled by, or is under common control with You. For purposes of this
+      definition, "control" means (a) the power, direct or indirect, to cause
+      the direction or management of such entity, whether by contract or
+      otherwise, or (b) ownership of more than fifty percent (50%) of the
+      outstanding shares or beneficial ownership of such entity.
+
+
+2. License Grants and Conditions
+
+2.1. Grants
+
+     Each Contributor hereby grants You a world-wide, royalty-free,
+     non-exclusive license:
+
+     a. under intellectual property rights (other than patent or trademark)
+        Licensable by such Contributor to use, reproduce, make available,
+        modify, display, perform, distribute, and otherwise exploit its
+        Contributions, either on an unmodified basis, with Modifications, or
+        as part of a Larger Work; and
+
+     b. under Patent Claims of such Contributor to make, use, sell, offer for
+        sale, have made, import, and otherwise transfer either its
+        Contributions or its Contributor Version.
+
+2.2. Effective Date
+
+     The licenses granted in Section 2.1 with respect to any Contribution
+     become effective for each Contribution on the date the Contributor first
+     distributes such Contribution.
+
+2.3. Limitations on Grant Scope
+
+     The licenses granted in this Section 2 are the only rights granted under
+     this License. No additional rights or licenses will be implied from the
+     distribution or licensing of Covered Software under this License.
+     Notwithstanding Section 2.1(b) above, no patent license is granted by a
+     Contributor:
+
+     a. for any code that a Contributor has removed from Covered Software; or
+
+     b. for infringements caused by: (i) Your and any other third party's
+        modifications of Covered Software, or (ii) the combination of its
+        Contributions with other software (except as part of its Contributor
+        Version); or
+
+     c. under Patent Claims infringed by Covered Software in the absence of
+        its Contributions.
+
+     This License does not grant any rights in the trademarks, service marks,
+     or logos of any Contributor (except as may be necessary to comply with
+     the notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+     No Contributor makes additional grants as a result of Your choice to
+     distribute the Covered Software under a subsequent version of this
+     License (see Section 10.2) or under the terms of a Secondary License (if
+     permitted under the terms of Section 3.3).
+
+2.5. Representation
+
+     Each Contributor represents that the Contributor believes its
+     Contributions are its original creation(s) or it has sufficient rights to
+     grant the rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+     This License is not intended to limit any rights You have under
+     applicable copyright doctrines of fair use, fair dealing, or other
+     equivalents.
+
+2.7. Conditions
+
+     Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
+     Section 2.1.
+
+
+3. Responsibilities
+
+3.1. Distribution of Source Form
+
+     All distribution of Covered Software in Source Code Form, including any
+     Modifications that You create or to which You contribute, must be under
+     the terms of this License. You must inform recipients that the Source
+     Code Form of the Covered Software is governed by the terms of this
+     License, and how they can obtain a copy of this License. You may not
+     attempt to alter or restrict the recipients' rights in the Source Code
+     Form.
+
+3.2. Distribution of Executable Form
+
+     If You distribute Covered Software in Executable Form then:
+
+     a. such Covered Software must also be made available in Source Code Form,
+        as described in Section 3.1, and You must inform recipients of the
+        Executable Form how they can obtain a copy of such Source Code Form by
+        reasonable means in a timely manner, at a charge no more than the cost
+        of distribution to the recipient; and
+
+     b. You may distribute such Executable Form under the terms of this
+        License, or sublicense it under different terms, provided that the
+        license for the Executable Form does not attempt to limit or alter the
+        recipients' rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+     You may create and distribute a Larger Work under terms of Your choice,
+     provided that You also comply with the requirements of this License for
+     the Covered Software. If the Larger Work is a combination of Covered
+     Software with a work governed by one or more Secondary Licenses, and the
+     Covered Software is not Incompatible With Secondary Licenses, this
+     License permits You to additionally distribute such Covered Software
+     under the terms of such Secondary License(s), so that the recipient of
+     the Larger Work may, at their option, further distribute the Covered
+     Software under the terms of either this License or such Secondary
+     License(s).
+
+3.4. Notices
+
+     You may not remove or alter the substance of any license notices
+     (including copyright notices, patent notices, disclaimers of warranty, or
+     limitations of liability) contained within the Source Code Form of the
+     Covered Software, except that You may alter any license notices to the
+     extent required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+     You may choose to offer, and to charge a fee for, warranty, support,
+     indemnity or liability obligations to one or more recipients of Covered
+     Software. However, You may do so only on Your own behalf, and not on
+     behalf of any Contributor. You must make it absolutely clear that any
+     such warranty, support, indemnity, or liability obligation is offered by
+     You alone, and You hereby agree to indemnify every Contributor for any
+     liability incurred by such Contributor as a result of warranty, support,
+     indemnity or liability terms You offer. You may include additional
+     disclaimers of warranty and limitations of liability specific to any
+     jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+
+   If it is impossible for You to comply with any of the terms of this License
+   with respect to some or all of the Covered Software due to statute,
+   judicial order, or regulation then You must: (a) comply with the terms of
+   this License to the maximum extent possible; and (b) describe the
+   limitations and the code they affect. Such description must be placed in a
+   text file included with all distributions of the Covered Software under
+   this License. Except to the extent prohibited by statute or regulation,
+   such description must be sufficiently detailed for a recipient of ordinary
+   skill to be able to understand it.
+
+5. Termination
+
+5.1. The rights granted under this License will terminate automatically if You
+     fail to comply with any of its terms. However, if You become compliant,
+     then the rights granted under this License from a particular Contributor
+     are reinstated (a) provisionally, unless and until such Contributor
+     explicitly and finally terminates Your grants, and (b) on an ongoing
+     basis, if such Contributor fails to notify You of the non-compliance by
+     some reasonable means prior to 60 days after You have come back into
+     compliance. Moreover, Your grants from a particular Contributor are
+     reinstated on an ongoing basis if such Contributor notifies You of the
+     non-compliance by some reasonable means, this is the first time You have
+     received notice of non-compliance with this License from such
+     Contributor, and You become compliant prior to 30 days after Your receipt
+     of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+     infringement claim (excluding declaratory judgment actions,
+     counter-claims, and cross-claims) alleging that a Contributor Version
+     directly or indirectly infringes any patent, then the rights granted to
+     You by any and all Contributors for the Covered Software under Section
+     2.1 of this License shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
+     license agreements (excluding distributors and resellers) which have been
+     validly granted by You or Your distributors under this License prior to
+     termination shall survive termination.
+
+6. Disclaimer of Warranty
+
+   Covered Software is provided under this License on an "as is" basis,
+   without warranty of any kind, either expressed, implied, or statutory,
+   including, without limitation, warranties that the Covered Software is free
+   of defects, merchantable, fit for a particular purpose or non-infringing.
+   The entire risk as to the quality and performance of the Covered Software
+   is with You. Should any Covered Software prove defective in any respect,
+   You (not any Contributor) assume the cost of any necessary servicing,
+   repair, or correction. This disclaimer of warranty constitutes an essential
+   part of this License. No use of  any Covered Software is authorized under
+   this License except under this disclaimer.
+
+7. Limitation of Liability
+
+   Under no circumstances and under no legal theory, whether tort (including
+   negligence), contract, or otherwise, shall any Contributor, or anyone who
+   distributes Covered Software as permitted above, be liable to You for any
+   direct, indirect, special, incidental, or consequential damages of any
+   character including, without limitation, damages for lost profits, loss of
+   goodwill, work stoppage, computer failure or malfunction, or any and all
+   other commercial damages or losses, even if such party shall have been
+   informed of the possibility of such damages. This limitation of liability
+   shall not apply to liability for death or personal injury resulting from
+   such party's negligence to the extent applicable law prohibits such
+   limitation. Some jurisdictions do not allow the exclusion or limitation of
+   incidental or consequential damages, so this exclusion and limitation may
+   not apply to You.
+
+8. Litigation
+
+   Any litigation relating to this License may be brought only in the courts
+   of a jurisdiction where the defendant maintains its principal place of
+   business and such litigation shall be governed by laws of that
+   jurisdiction, without reference to its conflict-of-law provisions. Nothing
+   in this Section shall prevent a party's ability to bring cross-claims or
+   counter-claims.
+
+9. Miscellaneous
+
+   This License represents the complete agreement concerning the subject
+   matter hereof. If any provision of this License is held to be
+   unenforceable, such provision shall be reformed only to the extent
+   necessary to make it enforceable. Any law or regulation which provides that
+   the language of a contract shall be construed against the drafter shall not
+   be used to construe this License against a Contributor.
+
+
+10. Versions of the License
+
+10.1. New Versions
+
+      Mozilla Foundation is the license steward. Except as provided in Section
+      10.3, no one other than the license steward has the right to modify or
+      publish new versions of this License. Each version will be given a
+      distinguishing version number.
+
+10.2. Effect of New Versions
+
+      You may distribute the Covered Software under the terms of the version
+      of the License under which You originally received the Covered Software,
+      or under the terms of any subsequent version published by the license
+      steward.
+
+10.3. Modified Versions
+
+      If you create software not governed by this License, and you want to
+      create a new license for such software, you may create and use a
+      modified version of this License if you rename the license and remove
+      any references to the name of the license steward (except to note that
+      such modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary
+      Licenses If You choose to distribute Source Code Form that is
+      Incompatible With Secondary Licenses under the terms of this version of
+      the License, the notice described in Exhibit B of this License must be
+      attached.
+
+Exhibit A - Source Code Form License Notice
+
+      This Source Code Form is subject to the
+      terms of the Mozilla Public License, v.
+      2.0. If a copy of the MPL was not
+      distributed with this file, You can
+      obtain one at
+      http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular file,
+then You may include the notice in a location (such as a LICENSE file in a
+relevant directory) where a recipient would be likely to look for such a
+notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - "Incompatible With Secondary Licenses" Notice
+
+      This Source Code Form is "Incompatible
+      With Secondary Licenses", as defined by
+      the Mozilla Public License, v. 2.0.
+
diff --git a/vendor/github.com/hashicorp/go-cleanhttp/README.md b/vendor/github.com/hashicorp/go-cleanhttp/README.md
new file mode 100644
index 0000000..036e531
--- /dev/null
+++ b/vendor/github.com/hashicorp/go-cleanhttp/README.md
@@ -0,0 +1,30 @@
+# cleanhttp
+
+Functions for accessing "clean" Go http.Client values
+
+-------------
+
+The Go standard library contains a default `http.Client` called
+`http.DefaultClient`. It is a common idiom in Go code to start with
+`http.DefaultClient` and tweak it as necessary, and in fact, this is
+encouraged; from the `http` package documentation:
+
+> The Client's Transport typically has internal state (cached TCP connections),
+so Clients should be reused instead of created as needed. Clients are safe for
+concurrent use by multiple goroutines.
+
+Unfortunately, this is a shared value, and it is not uncommon for libraries to
+assume that they are free to modify it at will. With enough dependencies, it
+can be very easy to encounter strange problems and race conditions due to
+manipulation of this shared value across libraries and goroutines (clients are
+safe for concurrent use, but writing values to the client struct itself is not
+protected).
+
+Making things worse is the fact that a bare `http.Client` will use a default
+`http.Transport` called `http.DefaultTransport`, which is another global value
+that behaves the same way. So it is not simply enough to replace
+`http.DefaultClient` with `&http.Client{}`.
+
+This repository provides some simple functions to get a "clean" `http.Client`
+-- one that uses the same default values as the Go standard library, but
+returns a client that does not share any state with other clients.
diff --git a/vendor/github.com/hashicorp/go-cleanhttp/cleanhttp.go b/vendor/github.com/hashicorp/go-cleanhttp/cleanhttp.go
new file mode 100644
index 0000000..7d8a57c
--- /dev/null
+++ b/vendor/github.com/hashicorp/go-cleanhttp/cleanhttp.go
@@ -0,0 +1,56 @@
+package cleanhttp
+
+import (
+        "net"
+        "net/http"
+        "runtime"
+        "time"
+)
+
+// DefaultTransport returns a new http.Transport with similar default values to
+// http.DefaultTransport, but with idle connections and keepalives disabled.
+func DefaultTransport() *http.Transport {
+        transport := DefaultPooledTransport()
+        transport.DisableKeepAlives = true
+        transport.MaxIdleConnsPerHost = -1
+        return transport
+}
+
+// DefaultPooledTransport returns a new http.Transport with similar default
+// values to http.DefaultTransport. Do not use this for transient transports as
+// it can leak file descriptors over time. Only use this for transports that
+// will be re-used for the same host(s).
+func DefaultPooledTransport() *http.Transport {
+        transport := &http.Transport{
+                Proxy: http.ProxyFromEnvironment,
+                DialContext: (&net.Dialer{
+                        Timeout:   30 * time.Second,
+                        KeepAlive: 30 * time.Second,
+                }).DialContext,
+                MaxIdleConns:          100,
+                IdleConnTimeout:       90 * time.Second,
+                TLSHandshakeTimeout:   10 * time.Second,
+                ExpectContinueTimeout: 1 * time.Second,
+                MaxIdleConnsPerHost:   runtime.GOMAXPROCS(0) + 1,
+        }
+        return transport
+}
+
+// DefaultClient returns a new http.Client with similar default values to
+// http.Client, but with a non-shared Transport, idle connections disabled, and
+// keepalives disabled.
+func DefaultClient() *http.Client {
+        return &http.Client{
+                Transport: DefaultTransport(),
+        }
+}
+
+// DefaultPooledClient returns a new http.Client with similar default values to
+// http.Client, but with a shared Transport. Do not use this function for
+// transient clients as it can leak file descriptors over time. Only use this
+// for clients that will be re-used for the same host(s).
+func DefaultPooledClient() *http.Client {
+        return &http.Client{
+                Transport: DefaultPooledTransport(),
+        }
+}
diff --git a/vendor/github.com/hashicorp/go-cleanhttp/doc.go b/vendor/github.com/hashicorp/go-cleanhttp/doc.go
new file mode 100644
index 0000000..0584109
--- /dev/null
+++ b/vendor/github.com/hashicorp/go-cleanhttp/doc.go
@@ -0,0 +1,20 @@
+// Package cleanhttp offers convenience utilities for acquiring "clean"
+// http.Transport and http.Client structs.
+//
+// Values set on http.DefaultClient and http.DefaultTransport affect all
+// callers. This can have detrimental effects, esepcially in TLS contexts,
+// where client or root certificates set to talk to multiple endpoints can end
+// up displacing each other, leading to hard-to-debug issues. This package
+// provides non-shared http.Client and http.Transport structs to ensure that
+// the configuration will not be overwritten by other parts of the application
+// or dependencies.
+//
+// The DefaultClient and DefaultTransport functions disable idle connections
+// and keepalives. Without ensuring that idle connections are closed before
+// garbage collection, short-term clients/transports can leak file descriptors,
+// eventually leading to "too many open files" errors. If you will be
+// connecting to the same hosts repeatedly from the same client, you can use
+// DefaultPooledClient to receive a client that has connection pooling
+// semantics similar to http.DefaultClient.
+//
+package cleanhttp
diff --git a/vendor/github.com/hashicorp/terraform/config/config.go b/vendor/github.com/hashicorp/terraform/config/config.go
index a157824..3f756dc 100644
--- a/vendor/github.com/hashicorp/terraform/config/config.go
+++ b/vendor/github.com/hashicorp/terraform/config/config.go
@@ -12,6 +12,7 @@ import (
         "github.com/hashicorp/hil"
         "github.com/hashicorp/hil/ast"
         "github.com/hashicorp/terraform/helper/hilmapstructure"
+        "github.com/hashicorp/terraform/plugin/discovery"
         "github.com/mitchellh/reflectwalk"
 )
 
@@ -64,6 +65,7 @@ type Module struct {
 type ProviderConfig struct {
         Name      string
         Alias     string
+        Version   string
         RawConfig *RawConfig
 }
 
@@ -238,6 +240,33 @@ func (r *Resource) Id() string {
         }
 }
 
+// ProviderFullName returns the full name of the provider for this resource,
+// which may either be specified explicitly using the "provider" meta-argument
+// or implied by the prefix on the resource type name.
+func (r *Resource) ProviderFullName() string {
+        return ResourceProviderFullName(r.Type, r.Provider)
+}
+
+// ResourceProviderFullName returns the full (dependable) name of the
+// provider for a hypothetical resource with the given resource type and
+// explicit provider string. If the explicit provider string is empty then
+// the provider name is inferred from the resource type name.
+func ResourceProviderFullName(resourceType, explicitProvider string) string {
+        if explicitProvider != "" {
+                return explicitProvider
+        }
+
+        idx := strings.IndexRune(resourceType, '_')
+        if idx == -1 {
+                // If no underscores, the resource name is assumed to be
+                // also the provider name, e.g. if the provider exposes
+                // only a single resource of each type.
+                return resourceType
+        }
+
+        return resourceType[:idx]
+}
+
 // Validate does some basic semantic checking of the configuration.
 func (c *Config) Validate() error {
         if c == nil {
@@ -349,7 +378,8 @@ func (c *Config) Validate() error {
                 }
         }
 
-        // Check that providers aren't declared multiple times.
+        // Check that providers aren't declared multiple times and that their
+        // version constraints, where present, are syntactically valid.
         providerSet := make(map[string]struct{})
         for _, p := range c.ProviderConfigs {
                 name := p.FullName()
@@ -360,6 +390,16 @@ func (c *Config) Validate() error {
                         continue
                 }
 
+                if p.Version != "" {
+                        _, err := discovery.ConstraintStr(p.Version).Parse()
+                        if err != nil {
+                                errs = append(errs, fmt.Errorf(
+                                        "provider.%s: invalid version constraint %q: %s",
+                                        name, p.Version, err,
+                                ))
+                        }
+                }
+
                 providerSet[name] = struct{}{}
         }
 
diff --git a/vendor/github.com/hashicorp/terraform/config/interpolate_funcs.go b/vendor/github.com/hashicorp/terraform/config/interpolate_funcs.go
index 7b7b3f2..a298cf2 100644
--- a/vendor/github.com/hashicorp/terraform/config/interpolate_funcs.go
+++ b/vendor/github.com/hashicorp/terraform/config/interpolate_funcs.go
@@ -70,6 +70,7 @@ func Funcs() map[string]ast.Function {
                 "coalescelist": interpolationFuncCoalesceList(),
                 "compact":      interpolationFuncCompact(),
                 "concat":       interpolationFuncConcat(),
+                "contains":     interpolationFuncContains(),
                 "dirname":      interpolationFuncDirname(),
                 "distinct":     interpolationFuncDistinct(),
                 "element":      interpolationFuncElement(),
@@ -356,6 +357,22 @@ func interpolationFuncCoalesceList() ast.Function {
         }
 }
 
+// interpolationFuncContains returns true if an element is in the list
+// and return false otherwise
+func interpolationFuncContains() ast.Function {
+        return ast.Function{
+                ArgTypes:   []ast.Type{ast.TypeList, ast.TypeString},
+                ReturnType: ast.TypeBool,
+                Callback: func(args []interface{}) (interface{}, error) {
+                        _, err := interpolationFuncIndex().Callback(args)
+                        if err != nil {
+                                return false, nil
+                        }
+                        return true, nil
+                },
+        }
+}
+
 // interpolationFuncConcat implements the "concat" function that concatenates
 // multiple lists.
 func interpolationFuncConcat() ast.Function {
diff --git a/vendor/github.com/hashicorp/terraform/config/loader.go b/vendor/github.com/hashicorp/terraform/config/loader.go
index 0bfa89c..5dd7d46 100644
--- a/vendor/github.com/hashicorp/terraform/config/loader.go
+++ b/vendor/github.com/hashicorp/terraform/config/loader.go
@@ -194,7 +194,7 @@ func dirFiles(dir string) ([]string, []string, error) {
                         // Only care about files that are valid to load
                         name := fi.Name()
                         extValue := ext(name)
-                        if extValue == "" || isIgnoredFile(name) {
+                        if extValue == "" || IsIgnoredFile(name) {
                                 continue
                         }
 
@@ -215,9 +215,9 @@ func dirFiles(dir string) ([]string, []string, error) {
         return files, overrides, nil
 }
 
-// isIgnoredFile returns true or false depending on whether the
+// IsIgnoredFile returns true or false depending on whether the
 // provided file name is a file that should be ignored.
-func isIgnoredFile(name string) bool {
+func IsIgnoredFile(name string) bool {
         return strings.HasPrefix(name, ".") || // Unix-like hidden files
                 strings.HasSuffix(name, "~") || // vim
                 strings.HasPrefix(name, "#") && strings.HasSuffix(name, "#") // emacs
diff --git a/vendor/github.com/hashicorp/terraform/config/loader_hcl.go b/vendor/github.com/hashicorp/terraform/config/loader_hcl.go
index 9abb196..e85e493 100644
--- a/vendor/github.com/hashicorp/terraform/config/loader_hcl.go
+++ b/vendor/github.com/hashicorp/terraform/config/loader_hcl.go
@@ -17,6 +17,20 @@ type hclConfigurable struct {
         Root *ast.File
 }
 
+var ReservedResourceFields = []string{
+        "connection",
+        "count",
+        "depends_on",
+        "lifecycle",
+        "provider",
+        "provisioner",
+}
+
+var ReservedProviderFields = []string{
+        "alias",
+        "version",
+}
+
 func (t *hclConfigurable) Config() (*Config, error) {
         validKeys := map[string]struct{}{
                 "atlas":     struct{}{},
@@ -562,6 +576,7 @@ func loadProvidersHcl(list *ast.ObjectList) ([]*ProviderConfig, error) {
                 }
 
                 delete(config, "alias")
+                delete(config, "version")
 
                 rawConfig, err := NewRawConfig(config)
                 if err != nil {
@@ -583,9 +598,22 @@ func loadProvidersHcl(list *ast.ObjectList) ([]*ProviderConfig, error) {
                         }
                 }
 
+                // If we have a version field then extract it
+                var version string
+                if a := listVal.Filter("version"); len(a.Items) > 0 {
+                        err := hcl.DecodeObject(&version, a.Items[0].Val)
+                        if err != nil {
+                                return nil, fmt.Errorf(
+                                        "Error reading version for provider[%s]: %s",
+                                        n,
+                                        err)
+                        }
+                }
+
                 result = append(result, &ProviderConfig{
                         Name:      n,
                         Alias:     alias,
+                        Version:   version,
                         RawConfig: rawConfig,
                 })
         }
diff --git a/vendor/github.com/hashicorp/terraform/config/module/tree.go b/vendor/github.com/hashicorp/terraform/config/module/tree.go
index b6f90fd..4b0b153 100644
--- a/vendor/github.com/hashicorp/terraform/config/module/tree.go
+++ b/vendor/github.com/hashicorp/terraform/config/module/tree.go
@@ -92,6 +92,25 @@ func (t *Tree) Children() map[string]*Tree {
         return t.children
 }
 
+// DeepEach calls the provided callback for the receiver and then all of
+// its descendents in the tree, allowing an operation to be performed on
+// all modules in the tree.
+//
+// Parents will be visited before their children but otherwise the order is
+// not defined.
+func (t *Tree) DeepEach(cb func(*Tree)) {
+        t.lock.RLock()
+        defer t.lock.RUnlock()
+        t.deepEach(cb)
+}
+
+func (t *Tree) deepEach(cb func(*Tree)) {
+        cb(t)
+        for _, c := range t.children {
+                c.deepEach(cb)
+        }
+}
+
 // Loaded says whether or not this tree has been loaded or not yet.
 func (t *Tree) Loaded() bool {
         t.lock.RLock()
diff --git a/vendor/github.com/hashicorp/terraform/config/providers.go b/vendor/github.com/hashicorp/terraform/config/providers.go
new file mode 100644
index 0000000..7a50782
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/config/providers.go
@@ -0,0 +1,103 @@
+package config
+
+import "github.com/blang/semver"
+
+// ProviderVersionConstraint presents a constraint for a particular
+// provider, identified by its full name.
+type ProviderVersionConstraint struct {
+        Constraint   string
+        ProviderType string
+}
+
+// ProviderVersionConstraints is a map from provider full name to its associated
+// ProviderVersionConstraint, as produced by Config.RequiredProviders.
+type ProviderVersionConstraints map[string]ProviderVersionConstraint
+
+// RequiredProviders returns the ProviderVersionConstraints for this
+// module.
+//
+// This includes both providers that are explicitly requested by provider
+// blocks and those that are used implicitly by instantiating one of their
+// resource types. In the latter case, the returned semver Range will
+// accept any version of the provider.
+func (c *Config) RequiredProviders() ProviderVersionConstraints {
+        ret := make(ProviderVersionConstraints, len(c.ProviderConfigs))
+
+        configs := c.ProviderConfigsByFullName()
+
+        // In order to find the *implied* dependencies (those without explicit
+        // "provider" blocks) we need to walk over all of the resources and
+        // cross-reference with the provider configs.
+        for _, rc := range c.Resources {
+                providerName := rc.ProviderFullName()
+                var providerType string
+
+                // Default to (effectively) no constraint whatsoever, but we might
+                // override if there's an explicit constraint in config.
+                constraint := ">=0.0.0"
+
+                config, ok := configs[providerName]
+                if ok {
+                        if config.Version != "" {
+                                constraint = config.Version
+                        }
+                        providerType = config.Name
+                } else {
+                        providerType = providerName
+                }
+
+                ret[providerName] = ProviderVersionConstraint{
+                        ProviderType: providerType,
+                        Constraint:   constraint,
+                }
+        }
+
+        return ret
+}
+
+// RequiredRanges returns a semver.Range for each distinct provider type in
+// the constraint map. If the same provider type appears more than once
+// (e.g. because aliases are in use) then their respective constraints are
+// combined such that they must *all* apply.
+//
+// The result of this method can be passed to the
+// PluginMetaSet.ConstrainVersions method within the plugin/discovery
+// package in order to filter down the available plugins to those which
+// satisfy the given constraints.
+//
+// This function will panic if any of the constraints within cannot be
+// parsed as semver ranges. This is guaranteed to never happen for a
+// constraint set that was built from a configuration that passed validation.
+func (cons ProviderVersionConstraints) RequiredRanges() map[string]semver.Range {
+        ret := make(map[string]semver.Range, len(cons))
+
+        for _, con := range cons {
+                spec := semver.MustParseRange(con.Constraint)
+                if existing, exists := ret[con.ProviderType]; exists {
+                        ret[con.ProviderType] = existing.AND(spec)
+                } else {
+                        ret[con.ProviderType] = spec
+                }
+        }
+
+        return ret
+}
+
+// ProviderConfigsByFullName returns a map from provider full names (as
+// returned by ProviderConfig.FullName()) to the corresponding provider
+// configs.
+//
+// This function returns no new information than what's already in
+// c.ProviderConfigs, but returns it in a more convenient shape. If there
+// is more than one provider config with the same full name then the result
+// is undefined, but that is guaranteed not to happen for any config that
+// has passed validation.
+func (c *Config) ProviderConfigsByFullName() map[string]*ProviderConfig {
+        ret := make(map[string]*ProviderConfig, len(c.ProviderConfigs))
+
+        for _, pc := range c.ProviderConfigs {
+                ret[pc.FullName()] = pc
+        }
+
+        return ret
+}
diff --git a/vendor/github.com/hashicorp/terraform/flatmap/expand.go b/vendor/github.com/hashicorp/terraform/flatmap/expand.go
index e0b81b6..1449065 100644
--- a/vendor/github.com/hashicorp/terraform/flatmap/expand.go
+++ b/vendor/github.com/hashicorp/terraform/flatmap/expand.go
@@ -60,6 +60,11 @@ func expandArray(m map[string]string, prefix string) []interface{} {
                 return []interface{}{}
         }
 
+        // NOTE: "num" is not necessarily accurate, e.g. if a user tampers
+        // with state, so the following code should not crash when given a
+        // number of items more or less than what's given in num. The
+        // num key is mainly just a hint that this is a list or set.
+
         // The Schema "Set" type stores its values in an array format, but
         // using numeric hash values instead of ordinal keys. Take the set
         // of keys regardless of value, and expand them in numeric order.
@@ -101,7 +106,7 @@ func expandArray(m map[string]string, prefix string) []interface{} {
         }
         sort.Ints(keysList)
 
-        result := make([]interface{}, num)
+        result := make([]interface{}, len(keysList))
         for i, key := range keysList {
                 keyString := strconv.Itoa(key)
                 if computed[keyString] {
diff --git a/vendor/github.com/hashicorp/terraform/helper/resource/id.go b/vendor/github.com/hashicorp/terraform/helper/resource/id.go
index 629582b..1cde67c 100644
--- a/vendor/github.com/hashicorp/terraform/helper/resource/id.go
+++ b/vendor/github.com/hashicorp/terraform/helper/resource/id.go
@@ -1,21 +1,17 @@
 package resource
 
 import (
-        "crypto/rand"
         "fmt"
-        "math/big"
+        "strings"
         "sync"
+        "time"
 )
 
 const UniqueIdPrefix = `terraform-`
 
-// idCounter is a randomly seeded monotonic counter for generating ordered
-// unique ids.  It uses a big.Int so we can easily increment a long numeric
-// string.  The max possible hex value here with 12 random bytes is
-// "01000000000000000000000000", so there's no chance of rollover during
-// operation.
+// idCounter is a monotonic counter for generating ordered unique ids.
 var idMutex sync.Mutex
-var idCounter = big.NewInt(0).SetBytes(randomBytes(12))
+var idCounter uint32
 
 // Helper for a resource to generate a unique identifier w/ default prefix
 func UniqueId() string {
@@ -25,15 +21,20 @@ func UniqueId() string {
 // Helper for a resource to generate a unique identifier w/ given prefix
 //
 // After the prefix, the ID consists of an incrementing 26 digit value (to match
-// previous timestamp output).
+// previous timestamp output).  After the prefix, the ID consists of a timestamp
+// and an incrementing 8 hex digit value The timestamp means that multiple IDs
+// created with the same prefix will sort in the order of their creation, even
+// across multiple terraform executions, as long as the clock is not turned back
+// between calls, and as long as any given terraform execution generates fewer
+// than 4 billion IDs.
 func PrefixedUniqueId(prefix string) string {
+        // Be precise to 4 digits of fractional seconds, but remove the dot before the
+        // fractional seconds.
+        timestamp := strings.Replace(
+                time.Now().UTC().Format("20060102150405.0000"), ".", "", 1)
+
         idMutex.Lock()
         defer idMutex.Unlock()
-        return fmt.Sprintf("%s%026x", prefix, idCounter.Add(idCounter, big.NewInt(1)))
-}
-
-func randomBytes(n int) []byte {
-        b := make([]byte, n)
-        rand.Read(b)
-        return b
+        idCounter++
+        return fmt.Sprintf("%s%s%08x", prefix, timestamp, idCounter)
 }
diff --git a/vendor/github.com/hashicorp/terraform/helper/resource/testing.go b/vendor/github.com/hashicorp/terraform/helper/resource/testing.go
index ebdbde2..d7de1a0 100644
--- a/vendor/github.com/hashicorp/terraform/helper/resource/testing.go
+++ b/vendor/github.com/hashicorp/terraform/helper/resource/testing.go
@@ -383,11 +383,11 @@ func Test(t TestT, c TestCase) {
                 c.PreCheck()
         }
 
-        ctxProviders, err := testProviderFactories(c)
+        providerResolver, err := testProviderResolver(c)
         if err != nil {
                 t.Fatal(err)
         }
-        opts := terraform.ContextOpts{Providers: ctxProviders}
+        opts := terraform.ContextOpts{ProviderResolver: providerResolver}
 
         // A single state variable to track the lifecycle, starting with no state
         var state *terraform.State
@@ -400,15 +400,22 @@ func Test(t TestT, c TestCase) {
                 var err error
                 log.Printf("[WARN] Test: Executing step %d", i)
 
-                // Determine the test mode to execute
-                if step.Config != "" {
-                        state, err = testStepConfig(opts, state, step)
-                } else if step.ImportState {
-                        state, err = testStepImportState(opts, state, step)
-                } else {
+                if step.Config == "" && !step.ImportState {
                         err = fmt.Errorf(
                                 "unknown test mode for step. Please see TestStep docs\n\n%#v",
                                 step)
+                } else {
+                        if step.ImportState {
+                                if step.Config == "" {
+                                        step.Config = testProviderConfig(c)
+                                }
+
+                                // Can optionally set step.Config in addition to
+                                // step.ImportState, to provide config for the import.
+                                state, err = testStepImportState(opts, state, step)
+                        } else {
+                                state, err = testStepConfig(opts, state, step)
+                        }
                 }
 
                 // If there was an error, exit
@@ -496,16 +503,29 @@ func Test(t TestT, c TestCase) {
         }
 }
 
-// testProviderFactories is a helper to build the ResourceProviderFactory map
+// testProviderConfig takes the list of Providers in a TestCase and returns a
+// config with only empty provider blocks. This is useful for Import, where no
+// config is provided, but the providers must be defined.
+func testProviderConfig(c TestCase) string {
+        var lines []string
+        for p := range c.Providers {
+                lines = append(lines, fmt.Sprintf("provider %q {}\n", p))
+        }
+
+        return strings.Join(lines, "")
+}
+
+// testProviderResolver is a helper to build a ResourceProviderResolver
 // with pre instantiated ResourceProviders, so that we can reset them for the
 // test, while only calling the factory function once.
 // Any errors are stored so that they can be returned by the factory in
 // terraform to match non-test behavior.
-func testProviderFactories(c TestCase) (map[string]terraform.ResourceProviderFactory, error) {
-        ctxProviders := c.ProviderFactories // make(map[string]terraform.ResourceProviderFactory)
+func testProviderResolver(c TestCase) (terraform.ResourceProviderResolver, error) {
+        ctxProviders := c.ProviderFactories
         if ctxProviders == nil {
                 ctxProviders = make(map[string]terraform.ResourceProviderFactory)
         }
+
         // add any fixed providers
         for k, p := range c.Providers {
                 ctxProviders[k] = terraform.ResourceProviderFactoryFixed(p)
@@ -527,7 +547,7 @@ func testProviderFactories(c TestCase) (map[string]terraform.ResourceProviderFac
                 }
         }
 
-        return ctxProviders, nil
+        return terraform.ResourceProviderResolverFixed(ctxProviders), nil
 }
 
 // UnitTest is a helper to force the acceptance testing harness to run in the
diff --git a/vendor/github.com/hashicorp/terraform/helper/schema/provider.go b/vendor/github.com/hashicorp/terraform/helper/schema/provider.go
index d52d2f5..fb28b41 100644
--- a/vendor/github.com/hashicorp/terraform/helper/schema/provider.go
+++ b/vendor/github.com/hashicorp/terraform/helper/schema/provider.go
@@ -8,6 +8,7 @@ import (
         "sync"
 
         "github.com/hashicorp/go-multierror"
+        "github.com/hashicorp/terraform/config"
         "github.com/hashicorp/terraform/terraform"
 )
 
@@ -89,6 +90,13 @@ func (p *Provider) InternalValidate() error {
                 validationErrors = multierror.Append(validationErrors, err)
         }
 
+        // Provider-specific checks
+        for k, _ := range sm {
+                if isReservedProviderFieldName(k) {
+                        return fmt.Errorf("%s is a reserved field name for a provider", k)
+                }
+        }
+
         for k, r := range p.ResourcesMap {
                 if err := r.InternalValidate(nil, true); err != nil {
                         validationErrors = multierror.Append(validationErrors, fmt.Errorf("resource %s: %s", k, err))
@@ -104,6 +112,15 @@ func (p *Provider) InternalValidate() error {
         return validationErrors
 }
 
+func isReservedProviderFieldName(name string) bool {
+        for _, reservedName := range config.ReservedProviderFields {
+                if name == reservedName {
+                        return true
+                }
+        }
+        return false
+}
+
 // Meta returns the metadata associated with this provider that was
 // returned by the Configure call. It will be nil until Configure is called.
 func (p *Provider) Meta() interface{} {
diff --git a/vendor/github.com/hashicorp/terraform/helper/schema/provisioner.go b/vendor/github.com/hashicorp/terraform/helper/schema/provisioner.go
index 856c675..476192e 100644
--- a/vendor/github.com/hashicorp/terraform/helper/schema/provisioner.go
+++ b/vendor/github.com/hashicorp/terraform/helper/schema/provisioner.go
@@ -43,7 +43,7 @@ type Provisioner struct {
 
         // ValidateFunc is a function for extended validation. This is optional
         // and should be used when individual field validation is not enough.
-        ValidateFunc func(*ResourceData) ([]string, []error)
+        ValidateFunc func(*terraform.ResourceConfig) ([]string, []error)
 
         stopCtx       context.Context
         stopCtxCancel context.CancelFunc
@@ -121,32 +121,6 @@ func (p *Provisioner) Stop() error {
         return nil
 }
 
-func (p *Provisioner) Validate(config *terraform.ResourceConfig) ([]string, []error) {
-        if err := p.InternalValidate(); err != nil {
-                return nil, []error{fmt.Errorf(
-                        "Internal validation of the provisioner failed! This is always a bug\n"+
-                                "with the provisioner itself, and not a user issue. Please report\n"+
-                                "this bug:\n\n%s", err)}
-        }
-        w := []string{}
-        e := []error{}
-        if p.Schema != nil {
-                w2, e2 := schemaMap(p.Schema).Validate(config)
-                w = append(w, w2...)
-                e = append(e, e2...)
-        }
-        if p.ValidateFunc != nil {
-                data := &ResourceData{
-                        schema: p.Schema,
-                        config: config,
-                }
-                w2, e2 := p.ValidateFunc(data)
-                w = append(w, w2...)
-                e = append(e, e2...)
-        }
-        return w, e
-}
-
 // Apply implementation of terraform.ResourceProvisioner interface.
 func (p *Provisioner) Apply(
         o terraform.UIOutput,
@@ -204,3 +178,27 @@ func (p *Provisioner) Apply(
         ctx = context.WithValue(ctx, ProvRawStateKey, s)
         return p.ApplyFunc(ctx)
 }
+
+// Validate implements the terraform.ResourceProvisioner interface.
+func (p *Provisioner) Validate(c *terraform.ResourceConfig) (ws []string, es []error) {
+        if err := p.InternalValidate(); err != nil {
+                return nil, []error{fmt.Errorf(
+                        "Internal validation of the provisioner failed! This is always a bug\n"+
+                                "with the provisioner itself, and not a user issue. Please report\n"+
+                                "this bug:\n\n%s", err)}
+        }
+
+        if p.Schema != nil {
+                w, e := schemaMap(p.Schema).Validate(c)
+                ws = append(ws, w...)
+                es = append(es, e...)
+        }
+
+        if p.ValidateFunc != nil {
+                w, e := p.ValidateFunc(c)
+                ws = append(ws, w...)
+                es = append(es, e...)
+        }
+
+        return ws, es
+}
diff --git a/vendor/github.com/hashicorp/terraform/helper/schema/resource.go b/vendor/github.com/hashicorp/terraform/helper/schema/resource.go
index c810558..ddba109 100644
--- a/vendor/github.com/hashicorp/terraform/helper/schema/resource.go
+++ b/vendor/github.com/hashicorp/terraform/helper/schema/resource.go
@@ -6,6 +6,7 @@ import (
         "log"
         "strconv"
 
+        "github.com/hashicorp/terraform/config"
         "github.com/hashicorp/terraform/terraform"
 )
 
@@ -142,6 +143,12 @@ func (r *Resource) Apply(
                 if err := rt.DiffDecode(d); err != nil {
                         log.Printf("[ERR] Error decoding ResourceTimeout: %s", err)
                 }
+        } else if s != nil {
+                if _, ok := s.Meta[TimeoutKey]; ok {
+                        if err := rt.StateDecode(s); err != nil {
+                                log.Printf("[ERR] Error decoding ResourceTimeout: %s", err)
+                        }
+                }
         } else {
                 log.Printf("[DEBUG] No meta timeoutkey found in Apply()")
         }
@@ -388,9 +395,25 @@ func (r *Resource) InternalValidate(topSchemaMap schemaMap, writable bool) error
                 }
         }
 
+        // Resource-specific checks
+        for k, _ := range tsm {
+                if isReservedResourceFieldName(k) {
+                        return fmt.Errorf("%s is a reserved field name for a resource", k)
+                }
+        }
+
         return schemaMap(r.Schema).InternalValidate(tsm)
 }
 
+func isReservedResourceFieldName(name string) bool {
+        for _, reservedName := range config.ReservedResourceFields {
+                if name == reservedName {
+                        return true
+                }
+        }
+        return false
+}
+
 // Data returns a ResourceData struct for this Resource. Each return value
 // is a separate copy and can be safely modified differently.
 //
diff --git a/vendor/github.com/hashicorp/terraform/helper/schema/schema.go b/vendor/github.com/hashicorp/terraform/helper/schema/schema.go
index 632672a..acb5618 100644
--- a/vendor/github.com/hashicorp/terraform/helper/schema/schema.go
+++ b/vendor/github.com/hashicorp/terraform/helper/schema/schema.go
@@ -15,6 +15,7 @@ import (
         "fmt"
         "os"
         "reflect"
+        "regexp"
         "sort"
         "strconv"
         "strings"
@@ -661,7 +662,13 @@ func (m schemaMap) InternalValidate(topSchemaMap schemaMap) error {
                 if v.ValidateFunc != nil {
                         switch v.Type {
                         case TypeList, TypeSet:
-                                return fmt.Errorf("ValidateFunc is not yet supported on lists or sets.")
+                                return fmt.Errorf("%s: ValidateFunc is not yet supported on lists or sets.", k)
+                        }
+                }
+
+                if v.Deprecated == "" && v.Removed == "" {
+                        if !isValidFieldName(k) {
+                                return fmt.Errorf("%s: Field name may only contain lowercase alphanumeric characters & underscores.", k)
                         }
                 }
         }
@@ -669,6 +676,11 @@ func (m schemaMap) InternalValidate(topSchemaMap schemaMap) error {
         return nil
 }
 
+func isValidFieldName(name string) bool {
+        re := regexp.MustCompile("^[a-z0-9_]+$")
+        return re.MatchString(name)
+}
+
 func (m schemaMap) diff(
         k string,
         schema *Schema,
diff --git a/vendor/github.com/hashicorp/terraform/helper/shadow/closer.go b/vendor/github.com/hashicorp/terraform/helper/shadow/closer.go
index 7edd5e7..edc1e2a 100644
--- a/vendor/github.com/hashicorp/terraform/helper/shadow/closer.go
+++ b/vendor/github.com/hashicorp/terraform/helper/shadow/closer.go
@@ -39,6 +39,8 @@ func (w *closeWalker) Struct(reflect.Value) error {
         return nil
 }
 
+var closerType = reflect.TypeOf((*io.Closer)(nil)).Elem()
+
 func (w *closeWalker) StructField(f reflect.StructField, v reflect.Value) error {
         // Not sure why this would be but lets avoid some panics
         if !v.IsValid() {
@@ -56,17 +58,18 @@ func (w *closeWalker) StructField(f reflect.StructField, v reflect.Value) error
                 return nil
         }
 
-        // We're looking for an io.Closer
-        raw := v.Interface()
-        if raw == nil {
-                return nil
+        var closer io.Closer
+        if v.Type().Implements(closerType) {
+                closer = v.Interface().(io.Closer)
+        } else if v.CanAddr() {
+                // The Close method may require a pointer receiver, but we only have a value.
+                v := v.Addr()
+                if v.Type().Implements(closerType) {
+                        closer = v.Interface().(io.Closer)
+                }
         }
 
-        closer, ok := raw.(io.Closer)
-        if !ok && v.CanAddr() {
-                closer, ok = v.Addr().Interface().(io.Closer)
-        }
-        if !ok {
+        if closer == nil {
                 return reflectwalk.SkipEntry
         }
 
diff --git a/vendor/github.com/hashicorp/terraform/helper/shadow/value.go b/vendor/github.com/hashicorp/terraform/helper/shadow/value.go
index 2413335..178b7e7 100644
--- a/vendor/github.com/hashicorp/terraform/helper/shadow/value.go
+++ b/vendor/github.com/hashicorp/terraform/helper/shadow/value.go
@@ -26,6 +26,14 @@ type Value struct {
         valueSet bool
 }
 
+func (v *Value) Lock() {
+        v.lock.Lock()
+}
+
+func (v *Value) Unlock() {
+        v.lock.Unlock()
+}
+
 // Close closes the value. This can never fail. For a definition of
 // "close" see the struct docs.
 func (w *Value) Close() error {
diff --git a/vendor/github.com/hashicorp/terraform/moduledeps/dependencies.go b/vendor/github.com/hashicorp/terraform/moduledeps/dependencies.go
new file mode 100644
index 0000000..87c8431
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/moduledeps/dependencies.go
@@ -0,0 +1,43 @@
+package moduledeps
+
+import (
+        "github.com/hashicorp/terraform/plugin/discovery"
+)
+
+// Providers describes a set of provider dependencies for a given module.
+//
+// Each named provider instance can have one version constraint.
+type Providers map[ProviderInstance]ProviderDependency
+
+// ProviderDependency describes the dependency for a particular provider
+// instance, including both the set of allowed versions and the reason for
+// the dependency.
+type ProviderDependency struct {
+        Constraints discovery.Constraints
+        Reason      ProviderDependencyReason
+}
+
+// ProviderDependencyReason is an enumeration of reasons why a dependency might be
+// present.
+type ProviderDependencyReason int
+
+const (
+        // ProviderDependencyExplicit means that there is an explicit "provider"
+        // block in the configuration for this module.
+        ProviderDependencyExplicit ProviderDependencyReason = iota
+
+        // ProviderDependencyImplicit means that there is no explicit "provider"
+        // block but there is at least one resource that uses this provider.
+        ProviderDependencyImplicit
+
+        // ProviderDependencyInherited is a special case of
+        // ProviderDependencyImplicit where a parent module has defined a
+        // configuration for the provider that has been inherited by at least one
+        // resource in this module.
+        ProviderDependencyInherited
+
+        // ProviderDependencyFromState means that this provider is not currently
+        // referenced by configuration at all, but some existing instances in
+        // the state still depend on it.
+        ProviderDependencyFromState
+)
diff --git a/vendor/github.com/hashicorp/terraform/moduledeps/doc.go b/vendor/github.com/hashicorp/terraform/moduledeps/doc.go
new file mode 100644
index 0000000..7eff083
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/moduledeps/doc.go
@@ -0,0 +1,7 @@
+// Package moduledeps contains types that can be used to describe the
+// providers required for all of the modules in a module tree.
+//
+// It does not itself contain the functionality for populating such
+// data structures; that's in Terraform core, since this package intentionally
+// does not depend on terraform core to avoid package dependency cycles.
+package moduledeps
diff --git a/vendor/github.com/hashicorp/terraform/moduledeps/module.go b/vendor/github.com/hashicorp/terraform/moduledeps/module.go
new file mode 100644
index 0000000..d6cbaf5
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/moduledeps/module.go
@@ -0,0 +1,204 @@
+package moduledeps
+
+import (
+        "sort"
+        "strings"
+
+        "github.com/hashicorp/terraform/plugin/discovery"
+)
+
+// Module represents the dependencies of a single module, as well being
+// a node in a tree of such structures representing the dependencies of
+// an entire configuration.
+type Module struct {
+        Name      string
+        Providers Providers
+        Children  []*Module
+}
+
+// WalkFunc is a callback type for use with Module.WalkTree
+type WalkFunc func(path []string, parent *Module, current *Module) error
+
+// WalkTree calls the given callback once for the receiver and then
+// once for each descendent, in an order such that parents are called
+// before their children and siblings are called in the order they
+// appear in the Children slice.
+//
+// When calling the callback, parent will be nil for the first call
+// for the receiving module, and then set to the direct parent of
+// each module for the subsequent calls.
+//
+// The path given to the callback is valid only until the callback
+// returns, after which it will be mutated and reused. Callbacks must
+// therefore copy the path slice if they wish to retain it.
+//
+// If the given callback returns an error, the walk will be aborted at
+// that point and that error returned to the caller.
+//
+// This function is not thread-safe for concurrent modifications of the
+// data structure, so it's the caller's responsibility to arrange for that
+// should it be needed.
+//
+// It is safe for a callback to modify the descendents of the "current"
+// module, including the ordering of the Children slice itself, but the
+// callback MUST NOT modify the parent module.
+func (m *Module) WalkTree(cb WalkFunc) error {
+        return walkModuleTree(make([]string, 0, 1), nil, m, cb)
+}
+
+func walkModuleTree(path []string, parent *Module, current *Module, cb WalkFunc) error {
+        path = append(path, current.Name)
+        err := cb(path, parent, current)
+        if err != nil {
+                return err
+        }
+
+        for _, child := range current.Children {
+                err := walkModuleTree(path, current, child, cb)
+                if err != nil {
+                        return err
+                }
+        }
+        return nil
+}
+
+// SortChildren sorts the Children slice into lexicographic order by
+// name, in-place.
+//
+// This is primarily useful prior to calling WalkTree so that the walk
+// will proceed in a consistent order.
+func (m *Module) SortChildren() {
+        sort.Sort(sortModules{m.Children})
+}
+
+// SortDescendents is a convenience wrapper for calling SortChildren on
+// the receiver and all of its descendent modules.
+func (m *Module) SortDescendents() {
+        m.WalkTree(func(path []string, parent *Module, current *Module) error {
+                current.SortChildren()
+                return nil
+        })
+}
+
+type sortModules struct {
+        modules []*Module
+}
+
+func (s sortModules) Len() int {
+        return len(s.modules)
+}
+
+func (s sortModules) Less(i, j int) bool {
+        cmp := strings.Compare(s.modules[i].Name, s.modules[j].Name)
+        return cmp < 0
+}
+
+func (s sortModules) Swap(i, j int) {
+        s.modules[i], s.modules[j] = s.modules[j], s.modules[i]
+}
+
+// PluginRequirements produces a PluginRequirements structure that can
+// be used with discovery.PluginMetaSet.ConstrainVersions to identify
+// suitable plugins to satisfy the module's provider dependencies.
+//
+// This method only considers the direct requirements of the receiver.
+// Use AllPluginRequirements to flatten the dependencies for the
+// entire tree of modules.
+//
+// Requirements returned by this method include only version constraints,
+// and apply no particular SHA256 hash constraint.
+func (m *Module) PluginRequirements() discovery.PluginRequirements {
+        ret := make(discovery.PluginRequirements)
+        for inst, dep := range m.Providers {
+                // m.Providers is keyed on provider names, such as "aws.foo".
+                // a PluginRequirements wants keys to be provider *types*, such
+                // as "aws". If there are multiple aliases for the same
+                // provider then we will flatten them into a single requirement
+                // by combining their constraint sets.
+                pty := inst.Type()
+                if existing, exists := ret[pty]; exists {
+                        ret[pty].Versions = existing.Versions.Append(dep.Constraints)
+                } else {
+                        ret[pty] = &discovery.PluginConstraints{
+                                Versions: dep.Constraints,
+                        }
+                }
+        }
+        return ret
+}
+
+// AllPluginRequirements calls PluginRequirements for the receiver and all
+// of its descendents, and merges the result into a single PluginRequirements
+// structure that would satisfy all of the modules together.
+//
+// Requirements returned by this method include only version constraints,
+// and apply no particular SHA256 hash constraint.
+func (m *Module) AllPluginRequirements() discovery.PluginRequirements {
+        var ret discovery.PluginRequirements
+        m.WalkTree(func(path []string, parent *Module, current *Module) error {
+                ret = ret.Merge(current.PluginRequirements())
+                return nil
+        })
+        return ret
+}
+
+// Equal returns true if the receiver is the root of an identical tree
+// to the other given Module. This is a deep comparison that considers
+// the equality of all downstream modules too.
+//
+// The children are considered to be ordered, so callers may wish to use
+// SortDescendents first to normalize the order of the slices of child nodes.
+//
+// The implementation of this function is not optimized since it is provided
+// primarily for use in tests.
+func (m *Module) Equal(other *Module) bool {
+        // take care of nils first
+        if m == nil && other == nil {
+                return true
+        } else if (m == nil && other != nil) || (m != nil && other == nil) {
+                return false
+        }
+
+        if m.Name != other.Name {
+                return false
+        }
+
+        if len(m.Providers) != len(other.Providers) {
+                return false
+        }
+        if len(m.Children) != len(other.Children) {
+                return false
+        }
+
+        // Can't use reflect.DeepEqual on this provider structure because
+        // the nested Constraints objects contain function pointers that
+        // never compare as equal. So we'll need to walk it the long way.
+        for inst, dep := range m.Providers {
+                if _, exists := other.Providers[inst]; !exists {
+                        return false
+                }
+
+                if dep.Reason != other.Providers[inst].Reason {
+                        return false
+                }
+
+                // Constraints are not too easy to compare robustly, so
+                // we'll just use their string representations as a proxy
+                // for now.
+                if dep.Constraints.String() != other.Providers[inst].Constraints.String() {
+                        return false
+                }
+        }
+
+        // Above we already checked that we have the same number of children
+        // in each module, so now we just need to check that they are
+        // recursively equal.
+        for i := range m.Children {
+                if !m.Children[i].Equal(other.Children[i]) {
+                        return false
+                }
+        }
+
+        // If we fall out here then they are equal
+        return true
+}
diff --git a/vendor/github.com/hashicorp/terraform/moduledeps/provider.go b/vendor/github.com/hashicorp/terraform/moduledeps/provider.go
new file mode 100644
index 0000000..89ceefb
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/moduledeps/provider.go
@@ -0,0 +1,30 @@
+package moduledeps
+
+import (
+        "strings"
+)
+
+// ProviderInstance describes a particular provider instance by its full name,
+// like "null" or "aws.foo".
+type ProviderInstance string
+
+// Type returns the provider type of this instance. For example, for an instance
+// named "aws.foo" the type is "aws".
+func (p ProviderInstance) Type() string {
+        t := string(p)
+        if dotPos := strings.Index(t, "."); dotPos != -1 {
+                t = t[:dotPos]
+        }
+        return t
+}
+
+// Alias returns the alias of this provider, if any. An instance named "aws.foo"
+// has the alias "foo", while an instance named just "docker" has no alias,
+// so the empty string would be returned.
+func (p ProviderInstance) Alias() string {
+        t := string(p)
+        if dotPos := strings.Index(t, "."); dotPos != -1 {
+                return t[dotPos+1:]
+        }
+        return ""
+}
diff --git a/vendor/github.com/hashicorp/terraform/plugin/client.go b/vendor/github.com/hashicorp/terraform/plugin/client.go
new file mode 100644
index 0000000..3a5cb7a
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/plugin/client.go
@@ -0,0 +1,24 @@
+package plugin
+
+import (
+        "os/exec"
+
+        plugin "github.com/hashicorp/go-plugin"
+        "github.com/hashicorp/terraform/plugin/discovery"
+)
+
+// ClientConfig returns a configuration object that can be used to instantiate
+// a client for the plugin described by the given metadata.
+func ClientConfig(m discovery.PluginMeta) *plugin.ClientConfig {
+        return &plugin.ClientConfig{
+                Cmd:             exec.Command(m.Path),
+                HandshakeConfig: Handshake,
+                Managed:         true,
+                Plugins:         PluginMap,
+        }
+}
+
+// Client returns a plugin client for the plugin described by the given metadata.
+func Client(m discovery.PluginMeta) *plugin.Client {
+        return plugin.NewClient(ClientConfig(m))
+}
diff --git a/vendor/github.com/hashicorp/terraform/plugin/discovery/error.go b/vendor/github.com/hashicorp/terraform/plugin/discovery/error.go
new file mode 100644
index 0000000..df855a7
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/plugin/discovery/error.go
@@ -0,0 +1,30 @@
+package discovery
+
+// Error is a type used to describe situations that the caller must handle
+// since they indicate some form of user error.
+//
+// The functions and methods that return these specialized errors indicate so
+// in their documentation. The Error type should not itself be used directly,
+// but rather errors should be compared using the == operator with the
+// error constants in this package.
+//
+// Values of this type are _not_ used when the error being reported is an
+// operational error (server unavailable, etc) or indicative of a bug in
+// this package or its caller.
+type Error string
+
+// ErrorNoSuitableVersion indicates that a suitable version (meeting given
+// constraints) is not available.
+const ErrorNoSuitableVersion = Error("no suitable version is available")
+
+// ErrorNoVersionCompatible indicates that all of the available versions
+// that otherwise met constraints are not compatible with the current
+// version of Terraform.
+const ErrorNoVersionCompatible = Error("no available version is compatible with this version of Terraform")
+
+// ErrorNoSuchProvider indicates that no provider exists with a name given
+const ErrorNoSuchProvider = Error("no provider exists with the given name")
+
+func (err Error) Error() string {
+        return string(err)
+}
diff --git a/vendor/github.com/hashicorp/terraform/plugin/discovery/find.go b/vendor/github.com/hashicorp/terraform/plugin/discovery/find.go
new file mode 100644
index 0000000..f5bc4c1
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/plugin/discovery/find.go
@@ -0,0 +1,168 @@
+package discovery
+
+import (
+        "io/ioutil"
+        "log"
+        "path/filepath"
+        "strings"
+)
+
+// FindPlugins looks in the given directories for files whose filenames
+// suggest that they are plugins of the given kind (e.g. "provider") and
+// returns a PluginMetaSet representing the discovered potential-plugins.
+//
+// Currently this supports two different naming schemes. The current
+// standard naming scheme is a subdirectory called $GOOS-$GOARCH containing
+// files named terraform-$KIND-$NAME-V$VERSION. The legacy naming scheme is
+// files directly in the given directory whose names are like
+// terraform-$KIND-$NAME.
+//
+// Only one plugin will be returned for each unique plugin (name, version)
+// pair, with preference given to files found in earlier directories.
+//
+// This is a convenience wrapper around FindPluginPaths and ResolvePluginsPaths.
+func FindPlugins(kind string, dirs []string) PluginMetaSet {
+        return ResolvePluginPaths(FindPluginPaths(kind, dirs))
+}
+
+// FindPluginPaths looks in the given directories for files whose filenames
+// suggest that they are plugins of the given kind (e.g. "provider").
+//
+// The return value is a list of absolute paths that appear to refer to
+// plugins in the given directories, based only on what can be inferred
+// from the naming scheme. The paths returned are ordered such that files
+// in later dirs appear after files in earlier dirs in the given directory
+// list. Within the same directory plugins are returned in a consistent but
+// undefined order.
+func FindPluginPaths(kind string, dirs []string) []string {
+        // This is just a thin wrapper around findPluginPaths so that we can
+        // use the latter in tests with a fake machineName so we can use our
+        // test fixtures.
+        return findPluginPaths(kind, dirs)
+}
+
+func findPluginPaths(kind string, dirs []string) []string {
+        prefix := "terraform-" + kind + "-"
+
+        ret := make([]string, 0, len(dirs))
+
+        for _, dir := range dirs {
+                items, err := ioutil.ReadDir(dir)
+                if err != nil {
+                        // Ignore missing dirs, non-dirs, etc
+                        continue
+                }
+
+                log.Printf("[DEBUG] checking for %s in %q", kind, dir)
+
+                for _, item := range items {
+                        fullName := item.Name()
+
+                        if !strings.HasPrefix(fullName, prefix) {
+                                log.Printf("[DEBUG] skipping %q, not a %s", fullName, kind)
+                                continue
+                        }
+
+                        // New-style paths must have a version segment in filename
+                        if strings.Contains(strings.ToLower(fullName), "_v") {
+                                absPath, err := filepath.Abs(filepath.Join(dir, fullName))
+                                if err != nil {
+                                        log.Printf("[ERROR] plugin filepath error: %s", err)
+                                        continue
+                                }
+
+                                log.Printf("[DEBUG] found %s %q", kind, fullName)
+                                ret = append(ret, filepath.Clean(absPath))
+                                continue
+                        }
+
+                        // Legacy style with files directly in the base directory
+                        absPath, err := filepath.Abs(filepath.Join(dir, fullName))
+                        if err != nil {
+                                log.Printf("[ERROR] plugin filepath error: %s", err)
+                                continue
+                        }
+
+                        log.Printf("[WARNING] found legacy %s %q", kind, fullName)
+
+                        ret = append(ret, filepath.Clean(absPath))
+                }
+        }
+
+        return ret
+}
+
+// ResolvePluginPaths takes a list of paths to plugin executables (as returned
+// by e.g. FindPluginPaths) and produces a PluginMetaSet describing the
+// referenced plugins.
+//
+// If the same combination of plugin name and version appears multiple times,
+// the earlier reference will be preferred. Several different versions of
+// the same plugin name may be returned, in which case the methods of
+// PluginMetaSet can be used to filter down.
+func ResolvePluginPaths(paths []string) PluginMetaSet {
+        s := make(PluginMetaSet)
+
+        type nameVersion struct {
+                Name    string
+                Version string
+        }
+        found := make(map[nameVersion]struct{})
+
+        for _, path := range paths {
+                baseName := strings.ToLower(filepath.Base(path))
+                if !strings.HasPrefix(baseName, "terraform-") {
+                        // Should never happen with reasonable input
+                        continue
+                }
+
+                baseName = baseName[10:]
+                firstDash := strings.Index(baseName, "-")
+                if firstDash == -1 {
+                        // Should never happen with reasonable input
+                        continue
+                }
+
+                baseName = baseName[firstDash+1:]
+                if baseName == "" {
+                        // Should never happen with reasonable input
+                        continue
+                }
+
+                // Trim the .exe suffix used on Windows before we start wrangling
+                // the remainder of the path.
+                if strings.HasSuffix(baseName, ".exe") {
+                        baseName = baseName[:len(baseName)-4]
+                }
+
+                parts := strings.SplitN(baseName, "_v", 2)
+                name := parts[0]
+                version := VersionZero
+                if len(parts) == 2 {
+                        version = parts[1]
+                }
+
+                // Auto-installed plugins contain an extra name portion representing
+                // the expected plugin version, which we must trim off.
+                if underX := strings.Index(version, "_x"); underX != -1 {
+                        version = version[:underX]
+                }
+
+                if _, ok := found[nameVersion{name, version}]; ok {
+                        // Skip duplicate versions of the same plugin
+                        // (We do this during this step because after this we will be
+                        // dealing with sets and thus lose our ordering with which to
+                        // decide preference.)
+                        continue
+                }
+
+                s.Add(PluginMeta{
+                        Name:    name,
+                        Version: VersionStr(version),
+                        Path:    path,
+                })
+                found[nameVersion{name, version}] = struct{}{}
+        }
+
+        return s
+}
diff --git a/vendor/github.com/hashicorp/terraform/plugin/discovery/get.go b/vendor/github.com/hashicorp/terraform/plugin/discovery/get.go
new file mode 100644
index 0000000..241b5cb
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/plugin/discovery/get.go
@@ -0,0 +1,424 @@
+package discovery
+
+import (
+        "errors"
+        "fmt"
+        "io/ioutil"
+        "log"
+        "net/http"
+        "os"
+        "runtime"
+        "strconv"
+        "strings"
+
+        "golang.org/x/net/html"
+
+        cleanhttp "github.com/hashicorp/go-cleanhttp"
+        getter "github.com/hashicorp/go-getter"
+        multierror "github.com/hashicorp/go-multierror"
+)
+
+// Releases are located by parsing the html listing from releases.hashicorp.com.
+//
+// The URL for releases follows the pattern:
+//    https://releases.hashicorp.com/terraform-provider-name/<x.y.z>/terraform-provider-name_<x.y.z>_<os>_<arch>.<ext>
+//
+// The plugin protocol version will be saved with the release and returned in
+// the header X-TERRAFORM_PROTOCOL_VERSION.
+
+const protocolVersionHeader = "x-terraform-protocol-version"
+
+var releaseHost = "https://releases.hashicorp.com"
+
+var httpClient = cleanhttp.DefaultClient()
+
+// An Installer maintains a local cache of plugins by downloading plugins
+// from an online repository.
+type Installer interface {
+        Get(name string, req Constraints) (PluginMeta, error)
+        PurgeUnused(used map[string]PluginMeta) (removed PluginMetaSet, err error)
+}
+
+// ProviderInstaller is an Installer implementation that knows how to
+// download Terraform providers from the official HashiCorp releases service
+// into a local directory. The files downloaded are compliant with the
+// naming scheme expected by FindPlugins, so the target directory of a
+// provider installer can be used as one of several plugin discovery sources.
+type ProviderInstaller struct {
+        Dir string
+
+        PluginProtocolVersion uint
+
+        // OS and Arch specify the OS and architecture that should be used when
+        // installing plugins. These use the same labels as the runtime.GOOS and
+        // runtime.GOARCH variables respectively, and indeed the values of these
+        // are used as defaults if either of these is the empty string.
+        OS   string
+        Arch string
+
+        // Skip checksum and signature verification
+        SkipVerify bool
+}
+
+// Get is part of an implementation of type Installer, and attempts to download
+// and install a Terraform provider matching the given constraints.
+//
+// This method may return one of a number of sentinel errors from this
+// package to indicate issues that are likely to be resolvable via user action:
+//
+//     ErrorNoSuchProvider: no provider with the given name exists in the repository.
+//     ErrorNoSuitableVersion: the provider exists but no available version matches constraints.
+//     ErrorNoVersionCompatible: a plugin was found within the constraints but it is
+//                               incompatible with the current Terraform version.
+//
+// These errors should be recognized and handled as special cases by the caller
+// to present a suitable user-oriented error message.
+//
+// All other errors indicate an internal problem that is likely _not_ solvable
+// through user action, or at least not within Terraform's scope. Error messages
+// are produced under the assumption that if presented to the user they will
+// be presented alongside context about what is being installed, and thus the
+// error messages do not redundantly include such information.
+func (i *ProviderInstaller) Get(provider string, req Constraints) (PluginMeta, error) {
+        versions, err := i.listProviderVersions(provider)
+        // TODO: return multiple errors
+        if err != nil {
+                return PluginMeta{}, err
+        }
+
+        if len(versions) == 0 {
+                return PluginMeta{}, ErrorNoSuitableVersion
+        }
+
+        versions = allowedVersions(versions, req)
+        if len(versions) == 0 {
+                return PluginMeta{}, ErrorNoSuitableVersion
+        }
+
+        // sort them newest to oldest
+        Versions(versions).Sort()
+
+        // take the first matching plugin we find
+        for _, v := range versions {
+                url := i.providerURL(provider, v.String())
+
+                if !i.SkipVerify {
+                        sha256, err := i.getProviderChecksum(provider, v.String())
+                        if err != nil {
+                                return PluginMeta{}, err
+                        }
+
+                        // add the checksum parameter for go-getter to verify the download for us.
+                        if sha256 != "" {
+                                url = url + "?checksum=sha256:" + sha256
+                        }
+                }
+
+                log.Printf("[DEBUG] fetching provider info for %s version %s", provider, v)
+                if checkPlugin(url, i.PluginProtocolVersion) {
+                        log.Printf("[DEBUG] getting provider %q version %q at %s", provider, v, url)
+                        err := getter.Get(i.Dir, url)
+                        if err != nil {
+                                return PluginMeta{}, err
+                        }
+
+                        // Find what we just installed
+                        // (This is weird, because go-getter doesn't directly return
+                        //  information about what was extracted, and we just extracted
+                        //  the archive directly into a shared dir here.)
+                        log.Printf("[DEBUG] looking for the %s %s plugin we just installed", provider, v)
+                        metas := FindPlugins("provider", []string{i.Dir})
+                        log.Printf("[DEBUG] all plugins found %#v", metas)
+                        metas, _ = metas.ValidateVersions()
+                        metas = metas.WithName(provider).WithVersion(v)
+                        log.Printf("[DEBUG] filtered plugins %#v", metas)
+                        if metas.Count() == 0 {
+                                // This should never happen. Suggests that the release archive
+                                // contains an executable file whose name doesn't match the
+                                // expected convention.
+                                return PluginMeta{}, fmt.Errorf(
+                                        "failed to find installed plugin version %s; this is a bug in Terraform and should be reported",
+                                        v,
+                                )
+                        }
+
+                        if metas.Count() > 1 {
+                                // This should also never happen, and suggests that a
+                                // particular version was re-released with a different
+                                // executable filename. We consider releases as immutable, so
+                                // this is an error.
+                                return PluginMeta{}, fmt.Errorf(
+                                        "multiple plugins installed for version %s; this is a bug in Terraform and should be reported",
+                                        v,
+                                )
+                        }
+
+                        // By now we know we have exactly one meta, and so "Newest" will
+                        // return that one.
+                        return metas.Newest(), nil
+                }
+
+                log.Printf("[INFO] incompatible ProtocolVersion for %s version %s", provider, v)
+        }
+
+        return PluginMeta{}, ErrorNoVersionCompatible
+}
+
+func (i *ProviderInstaller) PurgeUnused(used map[string]PluginMeta) (PluginMetaSet, error) {
+        purge := make(PluginMetaSet)
+
+        present := FindPlugins("provider", []string{i.Dir})
+        for meta := range present {
+                chosen, ok := used[meta.Name]
+                if !ok {
+                        purge.Add(meta)
+                }
+                if chosen.Path != meta.Path {
+                        purge.Add(meta)
+                }
+        }
+
+        removed := make(PluginMetaSet)
+        var errs error
+        for meta := range purge {
+                path := meta.Path
+                err := os.Remove(path)
+                if err != nil {
+                        errs = multierror.Append(errs, fmt.Errorf(
+                                "failed to remove unused provider plugin %s: %s",
+                                path, err,
+                        ))
+                } else {
+                        removed.Add(meta)
+                }
+        }
+
+        return removed, errs
+}
+
+// Plugins are referred to by the short name, but all URLs and files will use
+// the full name prefixed with terraform-<plugin_type>-
+func (i *ProviderInstaller) providerName(name string) string {
+        return "terraform-provider-" + name
+}
+
+func (i *ProviderInstaller) providerFileName(name, version string) string {
+        os := i.OS
+        arch := i.Arch
+        if os == "" {
+                os = runtime.GOOS
+        }
+        if arch == "" {
+                arch = runtime.GOARCH
+        }
+        return fmt.Sprintf("%s_%s_%s_%s.zip", i.providerName(name), version, os, arch)
+}
+
+// providerVersionsURL returns the path to the released versions directory for the provider:
+// https://releases.hashicorp.com/terraform-provider-name/
+func (i *ProviderInstaller) providerVersionsURL(name string) string {
+        return releaseHost + "/" + i.providerName(name) + "/"
+}
+
+// providerURL returns the full path to the provider file, using the current OS
+// and ARCH:
+// .../terraform-provider-name_<x.y.z>/terraform-provider-name_<x.y.z>_<os>_<arch>.<ext>
+func (i *ProviderInstaller) providerURL(name, version string) string {
+        return fmt.Sprintf("%s%s/%s", i.providerVersionsURL(name), version, i.providerFileName(name, version))
+}
+
+func (i *ProviderInstaller) providerChecksumURL(name, version string) string {
+        fileName := fmt.Sprintf("%s_%s_SHA256SUMS", i.providerName(name), version)
+        u := fmt.Sprintf("%s%s/%s", i.providerVersionsURL(name), version, fileName)
+        return u
+}
+
+func (i *ProviderInstaller) getProviderChecksum(name, version string) (string, error) {
+        checksums, err := getPluginSHA256SUMs(i.providerChecksumURL(name, version))
+        if err != nil {
+                return "", err
+        }
+
+        return checksumForFile(checksums, i.providerFileName(name, version)), nil
+}
+
+// Return the plugin version by making a HEAD request to the provided url.
+// If the header is not present, we assume the latest version will be
+// compatible, and leave the check for discovery or execution.
+func checkPlugin(url string, pluginProtocolVersion uint) bool {
+        resp, err := httpClient.Head(url)
+        if err != nil {
+                log.Printf("[ERROR] error fetching plugin headers: %s", err)
+                return false
+        }
+
+        if resp.StatusCode != http.StatusOK {
+                log.Println("[ERROR] non-200 status fetching plugin headers:", resp.Status)
+                return false
+        }
+
+        proto := resp.Header.Get(protocolVersionHeader)
+        if proto == "" {
+                // The header isn't present, but we don't make this error fatal since
+                // the latest version will probably work.
+                log.Printf("[WARNING] missing %s from: %s", protocolVersionHeader, url)
+                return true
+        }
+
+        protoVersion, err := strconv.Atoi(proto)
+        if err != nil {
+                log.Printf("[ERROR] invalid ProtocolVersion: %s", proto)
+                return false
+        }
+
+        return protoVersion == int(pluginProtocolVersion)
+}
+
+// list the version available for the named plugin
+func (i *ProviderInstaller) listProviderVersions(name string) ([]Version, error) {
+        versions, err := listPluginVersions(i.providerVersionsURL(name))
+        if err != nil {
+                // listPluginVersions returns a verbose error message indicating
+                // what was being accessed and what failed
+                return nil, err
+        }
+        return versions, nil
+}
+
+var errVersionNotFound = errors.New("version not found")
+
+// take the list of available versions for a plugin, and filter out those that
+// don't fit the constraints.
+func allowedVersions(available []Version, required Constraints) []Version {
+        var allowed []Version
+
+        for _, v := range available {
+                if required.Allows(v) {
+                        allowed = append(allowed, v)
+                }
+        }
+
+        return allowed
+}
+
+// return a list of the plugin versions at the given URL
+func listPluginVersions(url string) ([]Version, error) {
+        resp, err := httpClient.Get(url)
+        if err != nil {
+                // http library produces a verbose error message that includes the
+                // URL being accessed, etc.
+                return nil, err
+        }
+        defer resp.Body.Close()
+
+        if resp.StatusCode != http.StatusOK {
+                body, _ := ioutil.ReadAll(resp.Body)
+                log.Printf("[ERROR] failed to fetch plugin versions from %s\n%s\n%s", url, resp.Status, body)
+
+                switch resp.StatusCode {
+                case http.StatusNotFound, http.StatusForbidden:
+                        // These are treated as indicative of the given name not being
+                        // a valid provider name at all.
+                        return nil, ErrorNoSuchProvider
+
+                default:
+                        // All other errors are assumed to be operational problems.
+                        return nil, fmt.Errorf("error accessing %s: %s", url, resp.Status)
+                }
+
+        }
+
+        body, err := html.Parse(resp.Body)
+        if err != nil {
+                log.Fatal(err)
+        }
+
+        names := []string{}
+
+        // all we need to do is list links on the directory listing page that look like plugins
+        var f func(*html.Node)
+        f = func(n *html.Node) {
+                if n.Type == html.ElementNode && n.Data == "a" {
+                        c := n.FirstChild
+                        if c != nil && c.Type == html.TextNode && strings.HasPrefix(c.Data, "terraform-") {
+                                names = append(names, c.Data)
+                                return
+                        }
+                }
+                for c := n.FirstChild; c != nil; c = c.NextSibling {
+                        f(c)
+                }
+        }
+        f(body)
+
+        return versionsFromNames(names), nil
+}
+
+// parse the list of directory names into a sorted list of available versions
+func versionsFromNames(names []string) []Version {
+        var versions []Version
+        for _, name := range names {
+                parts := strings.SplitN(name, "_", 2)
+                if len(parts) == 2 && parts[1] != "" {
+                        v, err := VersionStr(parts[1]).Parse()
+                        if err != nil {
+                                // filter invalid versions scraped from the page
+                                log.Printf("[WARN] invalid version found for %q: %s", name, err)
+                                continue
+                        }
+
+                        versions = append(versions, v)
+                }
+        }
+
+        return versions
+}
+
+func checksumForFile(sums []byte, name string) string {
+        for _, line := range strings.Split(string(sums), "\n") {
+                parts := strings.Fields(line)
+                if len(parts) > 1 && parts[1] == name {
+                        return parts[0]
+                }
+        }
+        return ""
+}
+
+// fetch the SHA256SUMS file provided, and verify its signature.
+func getPluginSHA256SUMs(sumsURL string) ([]byte, error) {
+        sigURL := sumsURL + ".sig"
+
+        sums, err := getFile(sumsURL)
+        if err != nil {
+                return nil, fmt.Errorf("error fetching checksums: %s", err)
+        }
+
+        sig, err := getFile(sigURL)
+        if err != nil {
+                return nil, fmt.Errorf("error fetching checksums signature: %s", err)
+        }
+
+        if err := verifySig(sums, sig); err != nil {
+                return nil, err
+        }
+
+        return sums, nil
+}
+
+func getFile(url string) ([]byte, error) {
+        resp, err := httpClient.Get(url)
+        if err != nil {
+                return nil, err
+        }
+        defer resp.Body.Close()
+
+        if resp.StatusCode != http.StatusOK {
+                return nil, fmt.Errorf("%s", resp.Status)
+        }
+
+        data, err := ioutil.ReadAll(resp.Body)
+        if err != nil {
+                return data, err
+        }
+        return data, nil
+}
diff --git a/vendor/github.com/hashicorp/terraform/plugin/discovery/meta.go b/vendor/github.com/hashicorp/terraform/plugin/discovery/meta.go
new file mode 100644
index 0000000..bdcebcb
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/plugin/discovery/meta.go
@@ -0,0 +1,41 @@
+package discovery
+
+import (
+        "crypto/sha256"
+        "io"
+        "os"
+)
+
+// PluginMeta is metadata about a plugin, useful for launching the plugin
+// and for understanding which plugins are available.
+type PluginMeta struct {
+        // Name is the name of the plugin, e.g. as inferred from the plugin
+        // binary's filename, or by explicit configuration.
+        Name string
+
+        // Version is the semver version of the plugin, expressed as a string
+        // that might not be semver-valid.
+        Version VersionStr
+
+        // Path is the absolute path of the executable that can be launched
+        // to provide the RPC server for this plugin.
+        Path string
+}
+
+// SHA256 returns a SHA256 hash of the content of the referenced executable
+// file, or an error if the file's contents cannot be read.
+func (m PluginMeta) SHA256() ([]byte, error) {
+        f, err := os.Open(m.Path)
+        if err != nil {
+                return nil, err
+        }
+        defer f.Close()
+
+        h := sha256.New()
+        _, err = io.Copy(h, f)
+        if err != nil {
+                return nil, err
+        }
+
+        return h.Sum(nil), nil
+}
diff --git a/vendor/github.com/hashicorp/terraform/plugin/discovery/meta_set.go b/vendor/github.com/hashicorp/terraform/plugin/discovery/meta_set.go
new file mode 100644
index 0000000..181ea1f
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/plugin/discovery/meta_set.go
@@ -0,0 +1,195 @@
+package discovery
+
+// A PluginMetaSet is a set of PluginMeta objects meeting a certain criteria.
+//
+// Methods on this type allow filtering of the set to produce subsets that
+// meet more restrictive criteria.
+type PluginMetaSet map[PluginMeta]struct{}
+
+// Add inserts the given PluginMeta into the receiving set. This is a no-op
+// if the given meta is already present.
+func (s PluginMetaSet) Add(p PluginMeta) {
+        s[p] = struct{}{}
+}
+
+// Remove removes the given PluginMeta from the receiving set. This is a no-op
+// if the given meta is not already present.
+func (s PluginMetaSet) Remove(p PluginMeta) {
+        delete(s, p)
+}
+
+// Has returns true if the given meta is in the receiving set, or false
+// otherwise.
+func (s PluginMetaSet) Has(p PluginMeta) bool {
+        _, ok := s[p]
+        return ok
+}
+
+// Count returns the number of metas in the set
+func (s PluginMetaSet) Count() int {
+        return len(s)
+}
+
+// ValidateVersions returns two new PluginMetaSets, separating those with
+// versions that have syntax-valid semver versions from those that don't.
+//
+// Eliminating invalid versions from consideration (and possibly warning about
+// them) is usually the first step of working with a meta set after discovery
+// has completed.
+func (s PluginMetaSet) ValidateVersions() (valid, invalid PluginMetaSet) {
+        valid = make(PluginMetaSet)
+        invalid = make(PluginMetaSet)
+        for p := range s {
+                if _, err := p.Version.Parse(); err == nil {
+                        valid.Add(p)
+                } else {
+                        invalid.Add(p)
+                }
+        }
+        return
+}
+
+// WithName returns the subset of metas that have the given name.
+func (s PluginMetaSet) WithName(name string) PluginMetaSet {
+        ns := make(PluginMetaSet)
+        for p := range s {
+                if p.Name == name {
+                        ns.Add(p)
+                }
+        }
+        return ns
+}
+
+// WithVersion returns the subset of metas that have the given version.
+//
+// This should be used only with the "valid" result from ValidateVersions;
+// it will ignore any plugin metas that have a invalid version strings.
+func (s PluginMetaSet) WithVersion(version Version) PluginMetaSet {
+        ns := make(PluginMetaSet)
+        for p := range s {
+                gotVersion, err := p.Version.Parse()
+                if err != nil {
+                        continue
+                }
+                if gotVersion.Equal(version) {
+                        ns.Add(p)
+                }
+        }
+        return ns
+}
+
+// ByName groups the metas in the set by their Names, returning a map.
+func (s PluginMetaSet) ByName() map[string]PluginMetaSet {
+        ret := make(map[string]PluginMetaSet)
+        for p := range s {
+                if _, ok := ret[p.Name]; !ok {
+                        ret[p.Name] = make(PluginMetaSet)
+                }
+                ret[p.Name].Add(p)
+        }
+        return ret
+}
+
+// Newest returns the one item from the set that has the newest Version value.
+//
+// The result is meaningful only if the set is already filtered such that
+// all of the metas have the same Name.
+//
+// If there isn't at least one meta in the set then this function will panic.
+// Use Count() to ensure that there is at least one value before calling.
+//
+// If any of the metas have invalid version strings then this function will
+// panic. Use ValidateVersions() first to filter out metas with invalid
+// versions.
+//
+// If two metas have the same Version then one is arbitrarily chosen. This
+// situation should be avoided by pre-filtering the set.
+func (s PluginMetaSet) Newest() PluginMeta {
+        if len(s) == 0 {
+                panic("can't call NewestStable on empty PluginMetaSet")
+        }
+
+        var first = true
+        var winner PluginMeta
+        var winnerVersion Version
+        for p := range s {
+                version, err := p.Version.Parse()
+                if err != nil {
+                        panic(err)
+                }
+
+                if first == true || version.NewerThan(winnerVersion) {
+                        winner = p
+                        winnerVersion = version
+                        first = false
+                }
+        }
+
+        return winner
+}
+
+// ConstrainVersions takes a set of requirements and attempts to
+// return a map from name to a set of metas that have the matching
+// name and an appropriate version.
+//
+// If any of the given requirements match *no* plugins then its PluginMetaSet
+// in the returned map will be empty.
+//
+// All viable metas are returned, so the caller can apply any desired filtering
+// to reduce down to a single option. For example, calling Newest() to obtain
+// the highest available version.
+//
+// If any of the metas in the set have invalid version strings then this
+// function will panic. Use ValidateVersions() first to filter out metas with
+// invalid versions.
+func (s PluginMetaSet) ConstrainVersions(reqd PluginRequirements) map[string]PluginMetaSet {
+        ret := make(map[string]PluginMetaSet)
+        for p := range s {
+                name := p.Name
+                allowedVersions, ok := reqd[name]
+                if !ok {
+                        continue
+                }
+                if _, ok := ret[p.Name]; !ok {
+                        ret[p.Name] = make(PluginMetaSet)
+                }
+                version, err := p.Version.Parse()
+                if err != nil {
+                        panic(err)
+                }
+                if allowedVersions.Allows(version) {
+                        ret[p.Name].Add(p)
+                }
+        }
+        return ret
+}
+
+// OverridePaths returns a new set where any existing plugins with the given
+// names are removed and replaced with the single path given in the map.
+//
+// This is here only to continue to support the legacy way of overriding
+// plugin binaries in the .terraformrc file. It treats all given plugins
+// as pre-versioning (version 0.0.0). This mechanism will eventually be
+// phased out, with vendor directories being the intended replacement.
+func (s PluginMetaSet) OverridePaths(paths map[string]string) PluginMetaSet {
+        ret := make(PluginMetaSet)
+        for p := range s {
+                if _, ok := paths[p.Name]; ok {
+                        // Skip plugins that we're overridding
+                        continue
+                }
+
+                ret.Add(p)
+        }
+
+        // Now add the metadata for overriding plugins
+        for name, path := range paths {
+                ret.Add(PluginMeta{
+                        Name:    name,
+                        Version: VersionZero,
+                        Path:    path,
+                })
+        }
+
+        return ret
+}
diff --git a/vendor/github.com/hashicorp/terraform/plugin/discovery/requirements.go b/vendor/github.com/hashicorp/terraform/plugin/discovery/requirements.go
new file mode 100644
index 0000000..75430fd
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/plugin/discovery/requirements.go
@@ -0,0 +1,105 @@
+package discovery
+
+import (
+        "bytes"
+)
+
+// PluginRequirements describes a set of plugins (assumed to be of a consistent
+// kind) that are required to exist and have versions within the given
+// corresponding sets.
+type PluginRequirements map[string]*PluginConstraints
+
+// PluginConstraints represents an element of PluginRequirements describing
+// the constraints for a single plugin.
+type PluginConstraints struct {
+        // Specifies that the plugin's version must be within the given
+        // constraints.
+        Versions Constraints
+
+        // If non-nil, the hash of the on-disk plugin executable must exactly
+        // match the SHA256 hash given here.
+        SHA256 []byte
+}
+
+// Allows returns true if the given version is within the receiver's version
+// constraints.
+func (s *PluginConstraints) Allows(v Version) bool {
+        return s.Versions.Allows(v)
+}
+
+// AcceptsSHA256 returns true if the given executable SHA256 hash is acceptable,
+// either because it matches the constraint or because there is no such
+// constraint.
+func (s *PluginConstraints) AcceptsSHA256(digest []byte) bool {
+        if s.SHA256 == nil {
+                return true
+        }
+        return bytes.Equal(s.SHA256, digest)
+}
+
+// Merge takes the contents of the receiver and the other given requirements
+// object and merges them together into a single requirements structure
+// that satisfies both sets of requirements.
+//
+// Note that it doesn't make sense to merge two PluginRequirements with
+// differing required plugin SHA256 hashes, since the result will never
+// match any plugin.
+func (r PluginRequirements) Merge(other PluginRequirements) PluginRequirements {
+        ret := make(PluginRequirements)
+        for n, c := range r {
+                ret[n] = &PluginConstraints{
+                        Versions: Constraints{}.Append(c.Versions),
+                        SHA256:   c.SHA256,
+                }
+        }
+        for n, c := range other {
+                if existing, exists := ret[n]; exists {
+                        ret[n].Versions = ret[n].Versions.Append(c.Versions)
+
+                        if existing.SHA256 != nil {
+                                if c.SHA256 != nil && !bytes.Equal(c.SHA256, existing.SHA256) {
+                                        // If we've been asked to merge two constraints with
+                                        // different SHA256 hashes then we'll produce a dummy value
+                                        // that can never match anything. This is a silly edge case
+                                        // that no reasonable caller should hit.
+                                        ret[n].SHA256 = []byte(invalidProviderHash)
+                                }
+                        } else {
+                                ret[n].SHA256 = c.SHA256 // might still be nil
+                        }
+                } else {
+                        ret[n] = &PluginConstraints{
+                                Versions: Constraints{}.Append(c.Versions),
+                                SHA256:   c.SHA256,
+                        }
+                }
+        }
+        return ret
+}
+
+// LockExecutables applies additional constraints to the receiver that
+// require plugin executables with specific SHA256 digests. This modifies
+// the receiver in-place, since it's intended to be applied after
+// version constraints have been resolved.
+//
+// The given map must include a key for every plugin that is already
+// required. If not, any missing keys will cause the corresponding plugin
+// to never match, though the direct caller doesn't necessarily need to
+// guarantee this as long as the downstream code _applying_ these constraints
+// is able to deal with the non-match in some way.
+func (r PluginRequirements) LockExecutables(sha256s map[string][]byte) {
+        for name, cons := range r {
+                digest := sha256s[name]
+
+                if digest == nil {
+                        // Prevent any match, which will then presumably cause the
+                        // downstream consumer of this requirements to report an error.
+                        cons.SHA256 = []byte(invalidProviderHash)
+                        continue
+                }
+
+                cons.SHA256 = digest
+        }
+}
+
+const invalidProviderHash = "<invalid>"
diff --git a/vendor/github.com/hashicorp/terraform/plugin/discovery/signature.go b/vendor/github.com/hashicorp/terraform/plugin/discovery/signature.go
new file mode 100644
index 0000000..b6686a5
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/plugin/discovery/signature.go
@@ -0,0 +1,53 @@
+package discovery
+
+import (
+        "bytes"
+        "log"
+        "strings"
+
+        "golang.org/x/crypto/openpgp"
+)
+
+// Verify the data using the provided openpgp detached signature and the
+// embedded hashicorp public key.
+func verifySig(data, sig []byte) error {
+        el, err := openpgp.ReadArmoredKeyRing(strings.NewReader(hashiPublicKey))
+        if err != nil {
+                log.Fatal(err)
+        }
+
+        _, err = openpgp.CheckDetachedSignature(el, bytes.NewReader(data), bytes.NewReader(sig))
+        return err
+}
+
+// this is the public key that signs the checksums file for releases.
+const hashiPublicKey = `-----BEGIN PGP PUBLIC KEY BLOCK-----
+Version: GnuPG v1
+
+mQENBFMORM0BCADBRyKO1MhCirazOSVwcfTr1xUxjPvfxD3hjUwHtjsOy/bT6p9f
+W2mRPfwnq2JB5As+paL3UGDsSRDnK9KAxQb0NNF4+eVhr/EJ18s3wwXXDMjpIifq
+fIm2WyH3G+aRLTLPIpscUNKDyxFOUbsmgXAmJ46Re1fn8uKxKRHbfa39aeuEYWFA
+3drdL1WoUngvED7f+RnKBK2G6ZEpO+LDovQk19xGjiMTtPJrjMjZJ3QXqPvx5wca
+KSZLr4lMTuoTI/ZXyZy5bD4tShiZz6KcyX27cD70q2iRcEZ0poLKHyEIDAi3TM5k
+SwbbWBFd5RNPOR0qzrb/0p9ksKK48IIfH2FvABEBAAG0K0hhc2hpQ29ycCBTZWN1
+cml0eSA8c2VjdXJpdHlAaGFzaGljb3JwLmNvbT6JATgEEwECACIFAlMORM0CGwMG
+CwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEFGFLYc0j/xMyWIIAIPhcVqiQ59n
+Jc07gjUX0SWBJAxEG1lKxfzS4Xp+57h2xxTpdotGQ1fZwsihaIqow337YHQI3q0i
+SqV534Ms+j/tU7X8sq11xFJIeEVG8PASRCwmryUwghFKPlHETQ8jJ+Y8+1asRydi
+psP3B/5Mjhqv/uOK+Vy3zAyIpyDOMtIpOVfjSpCplVRdtSTFWBu9Em7j5I2HMn1w
+sJZnJgXKpybpibGiiTtmnFLOwibmprSu04rsnP4ncdC2XRD4wIjoyA+4PKgX3sCO
+klEzKryWYBmLkJOMDdo52LttP3279s7XrkLEE7ia0fXa2c12EQ0f0DQ1tGUvyVEW
+WmJVccm5bq25AQ0EUw5EzQEIANaPUY04/g7AmYkOMjaCZ6iTp9hB5Rsj/4ee/ln9
+wArzRO9+3eejLWh53FoN1rO+su7tiXJA5YAzVy6tuolrqjM8DBztPxdLBbEi4V+j
+2tK0dATdBQBHEh3OJApO2UBtcjaZBT31zrG9K55D+CrcgIVEHAKY8Cb4kLBkb5wM
+skn+DrASKU0BNIV1qRsxfiUdQHZfSqtp004nrql1lbFMLFEuiY8FZrkkQ9qduixo
+mTT6f34/oiY+Jam3zCK7RDN/OjuWheIPGj/Qbx9JuNiwgX6yRj7OE1tjUx6d8g9y
+0H1fmLJbb3WZZbuuGFnK6qrE3bGeY8+AWaJAZ37wpWh1p0cAEQEAAYkBHwQYAQIA
+CQUCUw5EzQIbDAAKCRBRhS2HNI/8TJntCAClU7TOO/X053eKF1jqNW4A1qpxctVc
+z8eTcY8Om5O4f6a/rfxfNFKn9Qyja/OG1xWNobETy7MiMXYjaa8uUx5iFy6kMVaP
+0BXJ59NLZjMARGw6lVTYDTIvzqqqwLxgliSDfSnqUhubGwvykANPO+93BBx89MRG
+unNoYGXtPlhNFrAsB1VR8+EyKLv2HQtGCPSFBhrjuzH3gxGibNDDdFQLxxuJWepJ
+EK1UbTS4ms0NgZ2Uknqn1WRU1Ki7rE4sTy68iZtWpKQXZEJa0IGnuI2sSINGcXCJ
+oEIgXTMyCILo34Fa/C6VCm2WBgz9zZO8/rHIiQm1J5zqz0DrDwKBUM9C
+=LYpS
+-----END PGP PUBLIC KEY BLOCK-----`
diff --git a/vendor/github.com/hashicorp/terraform/plugin/discovery/version.go b/vendor/github.com/hashicorp/terraform/plugin/discovery/version.go
new file mode 100644
index 0000000..8fad58d
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/plugin/discovery/version.go
@@ -0,0 +1,72 @@
+package discovery
+
+import (
+        "fmt"
+        "sort"
+
+        version "github.com/hashicorp/go-version"
+)
+
+const VersionZero = "0.0.0"
+
+// A VersionStr is a string containing a possibly-invalid representation
+// of a semver version number. Call Parse on it to obtain a real Version
+// object, or discover that it is invalid.
+type VersionStr string
+
+// Parse transforms a VersionStr into a Version if it is
+// syntactically valid. If it isn't then an error is returned instead.
+func (s VersionStr) Parse() (Version, error) {
+        raw, err := version.NewVersion(string(s))
+        if err != nil {
+                return Version{}, err
+        }
+        return Version{raw}, nil
+}
+
+// MustParse transforms a VersionStr into a Version if it is
+// syntactically valid. If it isn't then it panics.
+func (s VersionStr) MustParse() Version {
+        ret, err := s.Parse()
+        if err != nil {
+                panic(err)
+        }
+        return ret
+}
+
+// Version represents a version number that has been parsed from
+// a semver string and known to be valid.
+type Version struct {
+        // We wrap this here just because it avoids a proliferation of
+        // direct go-version imports all over the place, and keeps the
+        // version-processing details within this package.
+        raw *version.Version
+}
+
+func (v Version) String() string {
+        return v.raw.String()
+}
+
+func (v Version) NewerThan(other Version) bool {
+        return v.raw.GreaterThan(other.raw)
+}
+
+func (v Version) Equal(other Version) bool {
+        return v.raw.Equal(other.raw)
+}
+
+// MinorUpgradeConstraintStr returns a ConstraintStr that would permit
+// minor upgrades relative to the receiving version.
+func (v Version) MinorUpgradeConstraintStr() ConstraintStr {
+        segments := v.raw.Segments()
+        return ConstraintStr(fmt.Sprintf("~> %d.%d", segments[0], segments[1]))
+}
+
+type Versions []Version
+
+// Sort sorts version from newest to oldest.
+func (v Versions) Sort() {
+        sort.Slice(v, func(i, j int) bool {
+                return v[i].NewerThan(v[j])
+        })
+}
diff --git a/vendor/github.com/hashicorp/terraform/plugin/discovery/version_set.go b/vendor/github.com/hashicorp/terraform/plugin/discovery/version_set.go
new file mode 100644
index 0000000..0aefd75
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/plugin/discovery/version_set.go
@@ -0,0 +1,84 @@
+package discovery
+
+import (
+        "sort"
+
+        version "github.com/hashicorp/go-version"
+)
+
+// A ConstraintStr is a string containing a possibly-invalid representation
+// of a version constraint provided in configuration. Call Parse on it to
+// obtain a real Constraint object, or discover that it is invalid.
+type ConstraintStr string
+
+// Parse transforms a ConstraintStr into a Constraints if it is
+// syntactically valid. If it isn't then an error is returned instead.
+func (s ConstraintStr) Parse() (Constraints, error) {
+        raw, err := version.NewConstraint(string(s))
+        if err != nil {
+                return Constraints{}, err
+        }
+        return Constraints{raw}, nil
+}
+
+// MustParse is like Parse but it panics if the constraint string is invalid.
+func (s ConstraintStr) MustParse() Constraints {
+        ret, err := s.Parse()
+        if err != nil {
+                panic(err)
+        }
+        return ret
+}
+
+// Constraints represents a set of versions which any given Version is either
+// a member of or not.
+type Constraints struct {
+        raw version.Constraints
+}
+
+// AllVersions is a Constraints containing all versions
+var AllVersions Constraints
+
+func init() {
+        AllVersions = Constraints{
+                raw: make(version.Constraints, 0),
+        }
+}
+
+// Allows returns true if the given version permitted by the receiving
+// constraints set.
+func (s Constraints) Allows(v Version) bool {
+        return s.raw.Check(v.raw)
+}
+
+// Append combines the receiving set with the given other set to produce
+// a set that is the intersection of both sets, which is to say that resulting
+// constraints contain only the versions that are members of both.
+func (s Constraints) Append(other Constraints) Constraints {
+        raw := make(version.Constraints, 0, len(s.raw)+len(other.raw))
+
+        // Since "raw" is a list of constraints that remove versions from the set,
+        // "Intersection" is implemented by concatenating together those lists,
+        // thus leaving behind only the versions not removed by either list.
+        raw = append(raw, s.raw...)
+        raw = append(raw, other.raw...)
+
+        // while the set is unordered, we sort these lexically for consistent output
+        sort.Slice(raw, func(i, j int) bool {
+                return raw[i].String() < raw[j].String()
+        })
+
+        return Constraints{raw}
+}
+
+// String returns a string representation of the set members as a set
+// of range constraints.
+func (s Constraints) String() string {
+        return s.raw.String()
+}
+
+// Unconstrained returns true if and only if the receiver is an empty
+// constraint set.
+func (s Constraints) Unconstrained() bool {
+        return len(s.raw) == 0
+}
diff --git a/vendor/github.com/hashicorp/terraform/terraform/context.go b/vendor/github.com/hashicorp/terraform/terraform/context.go
index 306128e..a814a85 100644
--- a/vendor/github.com/hashicorp/terraform/terraform/context.go
+++ b/vendor/github.com/hashicorp/terraform/terraform/context.go
@@ -57,12 +57,17 @@ type ContextOpts struct {
         Parallelism        int
         State              *State
         StateFutureAllowed bool
-        Providers          map[string]ResourceProviderFactory
+        ProviderResolver   ResourceProviderResolver
         Provisioners       map[string]ResourceProvisionerFactory
         Shadow             bool
         Targets            []string
         Variables          map[string]interface{}
 
+        // If non-nil, will apply as additional constraints on the provider
+        // plugins that will be requested from the provider resolver.
+        ProviderSHA256s    map[string][]byte
+        SkipProviderVerify bool
+
         UIInput UIInput
 }
 
@@ -102,6 +107,7 @@ type Context struct {
         l                   sync.Mutex // Lock acquired during any task
         parallelSem         Semaphore
         providerInputConfig map[string]map[string]interface{}
+        providerSHA256s     map[string][]byte
         runLock             sync.Mutex
         runCond             *sync.Cond
         runContext          context.Context
@@ -166,7 +172,6 @@ func NewContext(opts *ContextOpts) (*Context, error) {
         //        set by environment variables if necessary. This includes
         //        values taken from -var-file in addition.
         variables := make(map[string]interface{})
-
         if opts.Module != nil {
                 var err error
                 variables, err = Variables(opts.Module, opts.Variables)
@@ -175,6 +180,23 @@ func NewContext(opts *ContextOpts) (*Context, error) {
                 }
         }
 
+        // Bind available provider plugins to the constraints in config
+        var providers map[string]ResourceProviderFactory
+        if opts.ProviderResolver != nil {
+                var err error
+                deps := ModuleTreeDependencies(opts.Module, state)
+                reqd := deps.AllPluginRequirements()
+                if opts.ProviderSHA256s != nil && !opts.SkipProviderVerify {
+                        reqd.LockExecutables(opts.ProviderSHA256s)
+                }
+                providers, err = resourceProviderFactories(opts.ProviderResolver, reqd)
+                if err != nil {
+                        return nil, err
+                }
+        } else {
+                providers = make(map[string]ResourceProviderFactory)
+        }
+
         diff := opts.Diff
         if diff == nil {
                 diff = &Diff{}
@@ -182,7 +204,7 @@ func NewContext(opts *ContextOpts) (*Context, error) {
 
         return &Context{
                 components: &basicComponentFactory{
-                        providers:    opts.Providers,
+                        providers:    providers,
                         provisioners: opts.Provisioners,
                 },
                 destroy:   opts.Destroy,
@@ -198,6 +220,7 @@ func NewContext(opts *ContextOpts) (*Context, error) {
 
                 parallelSem:         NewSemaphore(par),
                 providerInputConfig: make(map[string]map[string]interface{}),
+                providerSHA256s:     opts.ProviderSHA256s,
                 sh:                  sh,
         }, nil
 }
@@ -509,6 +532,9 @@ func (c *Context) Plan() (*Plan, error) {
                 Vars:    c.variables,
                 State:   c.state,
                 Targets: c.targets,
+
+                TerraformVersion: VersionString(),
+                ProviderSHA256s:  c.providerSHA256s,
         }
 
         var operation walkOperation
diff --git a/vendor/github.com/hashicorp/terraform/terraform/diff.go b/vendor/github.com/hashicorp/terraform/terraform/diff.go
index a9fae6c..fd1687e 100644
--- a/vendor/github.com/hashicorp/terraform/terraform/diff.go
+++ b/vendor/github.com/hashicorp/terraform/terraform/diff.go
@@ -28,7 +28,7 @@ const (
 // multiVal matches the index key to a flatmapped set, list or map
 var multiVal = regexp.MustCompile(`\.(#|%)$`)
 
-// Diff trackes the changes that are necessary to apply a configuration
+// Diff tracks the changes that are necessary to apply a configuration
 // to an existing infrastructure.
 type Diff struct {
         // Modules contains all the modules that have a diff
@@ -370,7 +370,7 @@ type InstanceDiff struct {
 
         // Meta is a simple K/V map that is stored in a diff and persisted to
         // plans but otherwise is completely ignored by Terraform core. It is
-        // mean to be used for additional data a resource may want to pass through.
+        // meant to be used for additional data a resource may want to pass through.
         // The value here must only contain Go primitives and collections.
         Meta map[string]interface{}
 }
@@ -551,7 +551,7 @@ func (d *InstanceDiff) SetDestroyDeposed(b bool) {
 }
 
 // These methods are properly locked, for use outside other InstanceDiff
-// methods but everywhere else within in the terraform package.
+// methods but everywhere else within the terraform package.
 // TODO refactor the locking scheme
 func (d *InstanceDiff) SetTainted(b bool) {
         d.mu.Lock()
diff --git a/vendor/github.com/hashicorp/terraform/terraform/eval_diff.go b/vendor/github.com/hashicorp/terraform/terraform/eval_diff.go
index 6f09526..c35f908 100644
--- a/vendor/github.com/hashicorp/terraform/terraform/eval_diff.go
+++ b/vendor/github.com/hashicorp/terraform/terraform/eval_diff.go
@@ -81,6 +81,12 @@ type EvalDiff struct {
         // Resource is needed to fetch the ignore_changes list so we can
         // filter user-requested ignored attributes from the diff.
         Resource *config.Resource
+
+        // Stub is used to flag the generated InstanceDiff as a stub. This is used to
+        // ensure that the node exists to perform interpolations and generate
+        // computed paths off of, but not as an actual diff where resouces should be
+        // counted, and not as a diff that should be acted on.
+        Stub bool
 }
 
 // TODO: test
@@ -90,11 +96,13 @@ func (n *EvalDiff) Eval(ctx EvalContext) (interface{}, error) {
         provider := *n.Provider
 
         // Call pre-diff hook
-        err := ctx.Hook(func(h Hook) (HookAction, error) {
-                return h.PreDiff(n.Info, state)
-        })
-        if err != nil {
-                return nil, err
+        if !n.Stub {
+                err := ctx.Hook(func(h Hook) (HookAction, error) {
+                        return h.PreDiff(n.Info, state)
+                })
+                if err != nil {
+                        return nil, err
+                }
         }
 
         // The state for the diff must never be nil
@@ -158,15 +166,19 @@ func (n *EvalDiff) Eval(ctx EvalContext) (interface{}, error) {
         }
 
         // Call post-refresh hook
-        err = ctx.Hook(func(h Hook) (HookAction, error) {
-                return h.PostDiff(n.Info, diff)
-        })
-        if err != nil {
-                return nil, err
+        if !n.Stub {
+                err = ctx.Hook(func(h Hook) (HookAction, error) {
+                        return h.PostDiff(n.Info, diff)
+                })
+                if err != nil {
+                        return nil, err
+                }
         }
 
-        // Update our output
-        *n.OutputDiff = diff
+        // Update our output if we care
+        if n.OutputDiff != nil {
+                *n.OutputDiff = diff
+        }
 
         // Update the state if we care
         if n.OutputState != nil {
diff --git a/vendor/github.com/hashicorp/terraform/terraform/graph_builder_plan.go b/vendor/github.com/hashicorp/terraform/terraform/graph_builder_plan.go
index a6a3a90..4b29bbb 100644
--- a/vendor/github.com/hashicorp/terraform/terraform/graph_builder_plan.go
+++ b/vendor/github.com/hashicorp/terraform/terraform/graph_builder_plan.go
@@ -117,7 +117,15 @@ func (b *PlanGraphBuilder) Steps() []GraphTransformer {
                 &CountBoundaryTransformer{},
 
                 // Target
-                &TargetsTransformer{Targets: b.Targets},
+                &TargetsTransformer{
+                        Targets: b.Targets,
+
+                        // Resource nodes from config have not yet been expanded for
+                        // "count", so we must apply targeting without indices. Exact
+                        // targeting will be dealt with later when these resources
+                        // DynamicExpand.
+                        IgnoreIndices: true,
+                },
 
                 // Close opened plugin connections
                 &CloseProviderTransformer{},
diff --git a/vendor/github.com/hashicorp/terraform/terraform/graph_builder_refresh.go b/vendor/github.com/hashicorp/terraform/terraform/graph_builder_refresh.go
index 0634f96..3d3e968 100644
--- a/vendor/github.com/hashicorp/terraform/terraform/graph_builder_refresh.go
+++ b/vendor/github.com/hashicorp/terraform/terraform/graph_builder_refresh.go
@@ -144,7 +144,15 @@ func (b *RefreshGraphBuilder) Steps() []GraphTransformer {
                 &ReferenceTransformer{},
 
                 // Target
-                &TargetsTransformer{Targets: b.Targets},
+                &TargetsTransformer{
+                        Targets: b.Targets,
+
+                        // Resource nodes from config have not yet been expanded for
+                        // "count", so we must apply targeting without indices. Exact
+                        // targeting will be dealt with later when these resources
+                        // DynamicExpand.
+                        IgnoreIndices: true,
+                },
 
                 // Close opened plugin connections
                 &CloseProviderTransformer{},
diff --git a/vendor/github.com/hashicorp/terraform/terraform/interpolate.go b/vendor/github.com/hashicorp/terraform/terraform/interpolate.go
index 0def295..22ddce6 100644
--- a/vendor/github.com/hashicorp/terraform/terraform/interpolate.go
+++ b/vendor/github.com/hashicorp/terraform/terraform/interpolate.go
@@ -317,9 +317,13 @@ func (i *Interpolater) valueTerraformVar(
         n string,
         v *config.TerraformVariable,
         result map[string]ast.Variable) error {
-        if v.Field != "env" {
+
+        // "env" is supported for backward compatibility, but it's deprecated and
+        // so we won't advertise it as being allowed in the error message. It will
+        // be removed in a future version of Terraform.
+        if v.Field != "workspace" && v.Field != "env" {
                 return fmt.Errorf(
-                        "%s: only supported key for 'terraform.X' interpolations is 'env'", n)
+                        "%s: only supported key for 'terraform.X' interpolations is 'workspace'", n)
         }
 
         if i.Meta == nil {
diff --git a/vendor/github.com/hashicorp/terraform/terraform/module_dependencies.go b/vendor/github.com/hashicorp/terraform/terraform/module_dependencies.go
new file mode 100644
index 0000000..b9f44a0
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/terraform/module_dependencies.go
@@ -0,0 +1,156 @@
+package terraform
+
+import (
+        "github.com/hashicorp/terraform/config"
+        "github.com/hashicorp/terraform/config/module"
+        "github.com/hashicorp/terraform/moduledeps"
+        "github.com/hashicorp/terraform/plugin/discovery"
+)
+
+// ModuleTreeDependencies returns the dependencies of the tree of modules
+// described by the given configuration tree and state.
+//
+// Both configuration and state are required because there can be resources
+// implied by instances in the state that no longer exist in config.
+//
+// This function will panic if any invalid version constraint strings are
+// present in the configuration. This is guaranteed not to happen for any
+// configuration that has passed a call to Config.Validate().
+func ModuleTreeDependencies(root *module.Tree, state *State) *moduledeps.Module {
+
+        // First we walk the configuration tree to build the overall structure
+        // and capture the explicit/implicit/inherited provider dependencies.
+        deps := moduleTreeConfigDependencies(root, nil)
+
+        // Next we walk over the resources in the state to catch any additional
+        // dependencies created by existing resources that are no longer in config.
+        // Most things we find in state will already be present in 'deps', but
+        // we're interested in the rare thing that isn't.
+        moduleTreeMergeStateDependencies(deps, state)
+
+        return deps
+}
+
+func moduleTreeConfigDependencies(root *module.Tree, inheritProviders map[string]*config.ProviderConfig) *moduledeps.Module {
+        if root == nil {
+                // If no config is provided, we'll make a synthetic root.
+                // This isn't necessarily correct if we're called with a nil that
+                // *isn't* at the root, but in practice that can never happen.
+                return &moduledeps.Module{
+                        Name: "root",
+                }
+        }
+
+        ret := &moduledeps.Module{
+                Name: root.Name(),
+        }
+
+        cfg := root.Config()
+        providerConfigs := cfg.ProviderConfigsByFullName()
+
+        // Provider dependencies
+        {
+                providers := make(moduledeps.Providers, len(providerConfigs))
+
+                // Any providerConfigs elements are *explicit* provider dependencies,
+                // which is the only situation where the user might provide an actual
+                // version constraint. We'll take care of these first.
+                for fullName, pCfg := range providerConfigs {
+                        inst := moduledeps.ProviderInstance(fullName)
+                        versionSet := discovery.AllVersions
+                        if pCfg.Version != "" {
+                                versionSet = discovery.ConstraintStr(pCfg.Version).MustParse()
+                        }
+                        providers[inst] = moduledeps.ProviderDependency{
+                                Constraints: versionSet,
+                                Reason:      moduledeps.ProviderDependencyExplicit,
+                        }
+                }
+
+                // Each resource in the configuration creates an *implicit* provider
+                // dependency, though we'll only record it if there isn't already
+                // an explicit dependency on the same provider.
+                for _, rc := range cfg.Resources {
+                        fullName := rc.ProviderFullName()
+                        inst := moduledeps.ProviderInstance(fullName)
+                        if _, exists := providers[inst]; exists {
+                                // Explicit dependency already present
+                                continue
+                        }
+
+                        reason := moduledeps.ProviderDependencyImplicit
+                        if _, inherited := inheritProviders[fullName]; inherited {
+                                reason = moduledeps.ProviderDependencyInherited
+                        }
+
+                        providers[inst] = moduledeps.ProviderDependency{
+                                Constraints: discovery.AllVersions,
+                                Reason:      reason,
+                        }
+                }
+
+                ret.Providers = providers
+        }
+
+        childInherit := make(map[string]*config.ProviderConfig)
+        for k, v := range inheritProviders {
+                childInherit[k] = v
+        }
+        for k, v := range providerConfigs {
+                childInherit[k] = v
+        }
+        for _, c := range root.Children() {
+                ret.Children = append(ret.Children, moduleTreeConfigDependencies(c, childInherit))
+        }
+
+        return ret
+}
+
+func moduleTreeMergeStateDependencies(root *moduledeps.Module, state *State) {
+        if state == nil {
+                return
+        }
+
+        findModule := func(path []string) *moduledeps.Module {
+                module := root
+                for _, name := range path[1:] { // skip initial "root"
+                        var next *moduledeps.Module
+                        for _, cm := range module.Children {
+                                if cm.Name == name {
+                                        next = cm
+                                        break
+                                }
+                        }
+
+                        if next == nil {
+                                // If we didn't find a next node, we'll need to make one
+                                next = &moduledeps.Module{
+                                        Name: name,
+                                }
+                                module.Children = append(module.Children, next)
+                        }
+
+                        module = next
+                }
+                return module
+        }
+
+        for _, ms := range state.Modules {
+                module := findModule(ms.Path)
+
+                for _, is := range ms.Resources {
+                        fullName := config.ResourceProviderFullName(is.Type, is.Provider)
+                        inst := moduledeps.ProviderInstance(fullName)
+                        if _, exists := module.Providers[inst]; !exists {
+                                if module.Providers == nil {
+                                        module.Providers = make(moduledeps.Providers)
+                                }
+                                module.Providers[inst] = moduledeps.ProviderDependency{
+                                        Constraints: discovery.AllVersions,
+                                        Reason:      moduledeps.ProviderDependencyFromState,
+                                }
+                        }
+                }
+        }
+
+}
diff --git a/vendor/github.com/hashicorp/terraform/terraform/node_resource_refresh.go b/vendor/github.com/hashicorp/terraform/terraform/node_resource_refresh.go
index 6ab9df7..cd4fe92 100644
--- a/vendor/github.com/hashicorp/terraform/terraform/node_resource_refresh.go
+++ b/vendor/github.com/hashicorp/terraform/terraform/node_resource_refresh.go
@@ -45,13 +45,6 @@ func (n *NodeRefreshableManagedResource) DynamicExpand(ctx EvalContext) (*Graph,
                         Addr:     n.ResourceAddr(),
                 },
 
-                // Switch up any node missing state to a plannable resource. This helps
-                // catch cases where data sources depend on the counts from this resource
-                // during a scale out.
-                &ResourceRefreshPlannableTransformer{
-                        State: state,
-                },
-
                 // Add the count orphans to make sure these resources are accounted for
                 // during a scale in.
                 &OrphanResourceCountTransformer{
@@ -100,6 +93,9 @@ func (n *NodeRefreshableManagedResourceInstance) EvalTree() EvalNode {
         // Eval info is different depending on what kind of resource this is
         switch mode := n.Addr.Mode; mode {
         case config.ManagedResourceMode:
+                if n.ResourceState == nil {
+                        return n.evalTreeManagedResourceNoState()
+                }
                 return n.evalTreeManagedResource()
 
         case config.DataResourceMode:
@@ -176,3 +172,88 @@ func (n *NodeRefreshableManagedResourceInstance) evalTreeManagedResource() EvalN
                 },
         }
 }
+
+// evalTreeManagedResourceNoState produces an EvalSequence for refresh resource
+// nodes that don't have state attached. An example of where this functionality
+// is useful is when a resource that already exists in state is being scaled
+// out, ie: has its resource count increased. In this case, the scaled out node
+// needs to be available to other nodes (namely data sources) that may depend
+// on it for proper interpolation, or confusing "index out of range" errors can
+// occur.
+//
+// The steps in this sequence are very similar to the steps carried out in
+// plan, but nothing is done with the diff after it is created - it is dropped,
+// and its changes are not counted in the UI.
+func (n *NodeRefreshableManagedResourceInstance) evalTreeManagedResourceNoState() EvalNode {
+        // Declare a bunch of variables that are used for state during
+        // evaluation. Most of this are written to by-address below.
+        var provider ResourceProvider
+        var state *InstanceState
+        var resourceConfig *ResourceConfig
+
+        addr := n.NodeAbstractResource.Addr
+        stateID := addr.stateId()
+        info := &InstanceInfo{
+                Id:         stateID,
+                Type:       addr.Type,
+                ModulePath: normalizeModulePath(addr.Path),
+        }
+
+        // Build the resource for eval
+        resource := &Resource{
+                Name:       addr.Name,
+                Type:       addr.Type,
+                CountIndex: addr.Index,
+        }
+        if resource.CountIndex < 0 {
+                resource.CountIndex = 0
+        }
+
+        // Determine the dependencies for the state.
+        stateDeps := n.StateReferences()
+
+        return &EvalSequence{
+                Nodes: []EvalNode{
+                        &EvalInterpolate{
+                                Config:   n.Config.RawConfig.Copy(),
+                                Resource: resource,
+                                Output:   &resourceConfig,
+                        },
+                        &EvalGetProvider{
+                                Name:   n.ProvidedBy()[0],
+                                Output: &provider,
+                        },
+                        // Re-run validation to catch any errors we missed, e.g. type
+                        // mismatches on computed values.
+                        &EvalValidateResource{
+                                Provider:       &provider,
+                                Config:         &resourceConfig,
+                                ResourceName:   n.Config.Name,
+                                ResourceType:   n.Config.Type,
+                                ResourceMode:   n.Config.Mode,
+                                IgnoreWarnings: true,
+                        },
+                        &EvalReadState{
+                                Name:   stateID,
+                                Output: &state,
+                        },
+                        &EvalDiff{
+                                Name:        stateID,
+                                Info:        info,
+                                Config:      &resourceConfig,
+                                Resource:    n.Config,
+                                Provider:    &provider,
+                                State:       &state,
+                                OutputState: &state,
+                                Stub:        true,
+                        },
+                        &EvalWriteState{
+                                Name:         stateID,
+                                ResourceType: n.Config.Type,
+                                Provider:     n.Config.Provider,
+                                Dependencies: stateDeps,
+                                State:        &state,
+                        },
+                },
+        }
+}
diff --git a/vendor/github.com/hashicorp/terraform/terraform/plan.go b/vendor/github.com/hashicorp/terraform/terraform/plan.go
index ea08845..51d6652 100644
--- a/vendor/github.com/hashicorp/terraform/terraform/plan.go
+++ b/vendor/github.com/hashicorp/terraform/terraform/plan.go
@@ -6,6 +6,7 @@ import (
         "errors"
         "fmt"
         "io"
+        "log"
         "sync"
 
         "github.com/hashicorp/terraform/config/module"
@@ -31,6 +32,9 @@ type Plan struct {
         Vars    map[string]interface{}
         Targets []string
 
+        TerraformVersion string
+        ProviderSHA256s  map[string][]byte
+
         // Backend is the backend that this plan should use and store data with.
         Backend *BackendState
 
@@ -40,19 +44,58 @@ type Plan struct {
 // Context returns a Context with the data encapsulated in this plan.
 //
 // The following fields in opts are overridden by the plan: Config,
-// Diff, State, Variables.
+// Diff, Variables.
+//
+// If State is not provided, it is set from the plan. If it _is_ provided,
+// it must be Equal to the state stored in plan, but may have a newer
+// serial.
 func (p *Plan) Context(opts *ContextOpts) (*Context, error) {
+        var err error
+        opts, err = p.contextOpts(opts)
+        if err != nil {
+                return nil, err
+        }
+        return NewContext(opts)
+}
+
+// contextOpts mutates the given base ContextOpts in place to use input
+// objects obtained from the receiving plan.
+func (p *Plan) contextOpts(base *ContextOpts) (*ContextOpts, error) {
+        opts := base
+
         opts.Diff = p.Diff
         opts.Module = p.Module
-        opts.State = p.State
         opts.Targets = p.Targets
+        opts.ProviderSHA256s = p.ProviderSHA256s
+
+        if opts.State == nil {
+                opts.State = p.State
+        } else if !opts.State.Equal(p.State) {
+                // Even if we're overriding the state, it should be logically equal
+                // to what's in plan. The only valid change to have made by the time
+                // we get here is to have incremented the serial.
+                //
+                // Due to the fact that serialization may change the representation of
+                // the state, there is little chance that these aren't actually equal.
+                // Log the error condition for reference, but continue with the state
+                // we have.
+                log.Println("[WARNING] Plan state and ContextOpts state are not equal")
+        }
+
+        thisVersion := VersionString()
+        if p.TerraformVersion != "" && p.TerraformVersion != thisVersion {
+                return nil, fmt.Errorf(
+                        "plan was created with a different version of Terraform (created with %s, but running %s)",
+                        p.TerraformVersion, thisVersion,
+                )
+        }
 
         opts.Variables = make(map[string]interface{})
         for k, v := range p.Vars {
                 opts.Variables[k] = v
         }
 
-        return NewContext(opts)
+        return opts, nil
 }
 
 func (p *Plan) String() string {
@@ -86,7 +129,7 @@ func (p *Plan) init() {
 // the ability in the future to change the file format if we want for any
 // reason.
 const planFormatMagic = "tfplan"
-const planFormatVersion byte = 1
+const planFormatVersion byte = 2
 
 // ReadPlan reads a plan structure out of a reader in the format that
 // was written by WritePlan.
diff --git a/vendor/github.com/hashicorp/terraform/terraform/resource_address.go b/vendor/github.com/hashicorp/terraform/terraform/resource_address.go
index a8a0c95..8badca8 100644
--- a/vendor/github.com/hashicorp/terraform/terraform/resource_address.go
+++ b/vendor/github.com/hashicorp/terraform/terraform/resource_address.go
@@ -8,6 +8,7 @@ import (
         "strings"
 
         "github.com/hashicorp/terraform/config"
+        "github.com/hashicorp/terraform/config/module"
 )
 
 // ResourceAddress is a way of identifying an individual resource (or,
@@ -89,6 +90,51 @@ func (r *ResourceAddress) String() string {
         return strings.Join(result, ".")
 }
 
+// HasResourceSpec returns true if the address has a resource spec, as
+// defined in the documentation:
+//    https://www.terraform.io/docs/internals/resource-addressing.html
+// In particular, this returns false if the address contains only
+// a module path, thus addressing the entire module.
+func (r *ResourceAddress) HasResourceSpec() bool {
+        return r.Type != "" && r.Name != ""
+}
+
+// WholeModuleAddress returns the resource address that refers to all
+// resources in the same module as the receiver address.
+func (r *ResourceAddress) WholeModuleAddress() *ResourceAddress {
+        return &ResourceAddress{
+                Path:            r.Path,
+                Index:           -1,
+                InstanceTypeSet: false,
+        }
+}
+
+// MatchesConfig returns true if the receiver matches the given
+// configuration resource within the given configuration module.
+//
+// Since resource configuration blocks represent all of the instances of
+// a multi-instance resource, the index of the address (if any) is not
+// considered.
+func (r *ResourceAddress) MatchesConfig(mod *module.Tree, rc *config.Resource) bool {
+        if r.HasResourceSpec() {
+                if r.Mode != rc.Mode || r.Type != rc.Type || r.Name != rc.Name {
+                        return false
+                }
+        }
+
+        addrPath := r.Path
+        cfgPath := mod.Path()
+
+        // normalize
+        if len(addrPath) == 0 {
+                addrPath = nil
+        }
+        if len(cfgPath) == 0 {
+                cfgPath = nil
+        }
+        return reflect.DeepEqual(addrPath, cfgPath)
+}
+
 // stateId returns the ID that this resource should be entered with
 // in the state. This is also used for diffs. In the future, we'd like to
 // move away from this string field so I don't export this.
@@ -185,7 +231,10 @@ func ParseResourceAddress(s string) (*ResourceAddress, error) {
 
         // not allowed to say "data." without a type following
         if mode == config.DataResourceMode && matches["type"] == "" {
-                return nil, fmt.Errorf("must target specific data instance")
+                return nil, fmt.Errorf(
+                        "invalid resource address %q: must target specific data instance",
+                        s,
+                )
         }
 
         return &ResourceAddress{
@@ -199,6 +248,75 @@ func ParseResourceAddress(s string) (*ResourceAddress, error) {
         }, nil
 }
 
+// ParseResourceAddressForInstanceDiff creates a ResourceAddress for a
+// resource name as described in a module diff.
+//
+// For historical reasons a different addressing format is used in this
+// context. The internal format should not be shown in the UI and instead
+// this function should be used to translate to a ResourceAddress and
+// then, where appropriate, use the String method to produce a canonical
+// resource address string for display in the UI.
+//
+// The given path slice must be empty (or nil) for the root module, and
+// otherwise consist of a sequence of module names traversing down into
+// the module tree. If a non-nil path is provided, the caller must not
+// modify its underlying array after passing it to this function.
+func ParseResourceAddressForInstanceDiff(path []string, key string) (*ResourceAddress, error) {
+        addr, err := parseResourceAddressInternal(key)
+        if err != nil {
+                return nil, err
+        }
+        addr.Path = path
+        return addr, nil
+}
+
+// Contains returns true if and only if the given node is contained within
+// the receiver.
+//
+// Containment is defined in terms of the module and resource heirarchy:
+// a resource is contained within its module and any ancestor modules,
+// an indexed resource instance is contained with the unindexed resource, etc.
+func (addr *ResourceAddress) Contains(other *ResourceAddress) bool {
+        ourPath := addr.Path
+        givenPath := other.Path
+        if len(givenPath) < len(ourPath) {
+                return false
+        }
+        for i := range ourPath {
+                if ourPath[i] != givenPath[i] {
+                        return false
+                }
+        }
+
+        // If the receiver is a whole-module address then the path prefix
+        // matching is all we need.
+        if !addr.HasResourceSpec() {
+                return true
+        }
+
+        if addr.Type != other.Type || addr.Name != other.Name || addr.Mode != other.Mode {
+                return false
+        }
+
+        if addr.Index != -1 && addr.Index != other.Index {
+                return false
+        }
+
+        if addr.InstanceTypeSet && (addr.InstanceTypeSet != other.InstanceTypeSet || addr.InstanceType != other.InstanceType) {
+                return false
+        }
+
+        return true
+}
+
+// Equals returns true if the receiver matches the given address.
+//
+// The name of this method is a misnomer, since it doesn't test for exact
+// equality. Instead, it tests that the _specified_ parts of each
+// address match, treating any unspecified parts as wildcards.
+//
+// See also Contains, which takes a more heirarchical approach to comparing
+// addresses.
 func (addr *ResourceAddress) Equals(raw interface{}) bool {
         other, ok := raw.(*ResourceAddress)
         if !ok {
@@ -233,6 +351,58 @@ func (addr *ResourceAddress) Equals(raw interface{}) bool {
                 modeMatch
 }
 
+// Less returns true if and only if the receiver should be sorted before
+// the given address when presenting a list of resource addresses to
+// an end-user.
+//
+// This sort uses lexicographic sorting for most components, but uses
+// numeric sort for indices, thus causing index 10 to sort after
+// index 9, rather than after index 1.
+func (addr *ResourceAddress) Less(other *ResourceAddress) bool {
+
+        switch {
+
+        case len(addr.Path) < len(other.Path):
+                return true
+
+        case !reflect.DeepEqual(addr.Path, other.Path):
+                // If the two paths are the same length but don't match, we'll just
+                // cheat and compare the string forms since it's easier than
+                // comparing all of the path segments in turn.
+                addrStr := addr.String()
+                otherStr := other.String()
+                return addrStr < otherStr
+
+        case addr.Mode == config.DataResourceMode && other.Mode != config.DataResourceMode:
+                return true
+
+        case addr.Type < other.Type:
+                return true
+
+        case addr.Name < other.Name:
+                return true
+
+        case addr.Index < other.Index:
+                // Since "Index" is -1 for an un-indexed address, this also conveniently
+                // sorts unindexed addresses before indexed ones, should they both
+                // appear for some reason.
+                return true
+
+        case other.InstanceTypeSet && !addr.InstanceTypeSet:
+                return true
+
+        case addr.InstanceType < other.InstanceType:
+                // InstanceType is actually an enum, so this is just an arbitrary
+                // sort based on the enum numeric values, and thus not particularly
+                // meaningful.
+                return true
+
+        default:
+                return false
+
+        }
+}
+
 func ParseResourceIndex(s string) (int, error) {
         if s == "" {
                 return -1, nil
@@ -275,7 +445,7 @@ func tokenizeResourceAddress(s string) (map[string]string, error) {
         // string "aws_instance.web.tainted[1]"
         re := regexp.MustCompile(`\A` +
                 // "module.foo.module.bar" (optional)
-                `(?P<path>(?:module\.[^.]+\.?)*)` +
+                `(?P<path>(?:module\.(?P<module_name>[^.]+)\.?)*)` +
                 // possibly "data.", if targeting is a data resource
                 `(?P<data_prefix>(?:data\.)?)` +
                 // "aws_instance.web" (optional when module path specified)
@@ -289,7 +459,7 @@ func tokenizeResourceAddress(s string) (map[string]string, error) {
         groupNames := re.SubexpNames()
         rawMatches := re.FindAllStringSubmatch(s, -1)
         if len(rawMatches) != 1 {
-                return nil, fmt.Errorf("Problem parsing address: %q", s)
+                return nil, fmt.Errorf("invalid resource address %q", s)
         }
 
         matches := make(map[string]string)
diff --git a/vendor/github.com/hashicorp/terraform/terraform/resource_provider.go b/vendor/github.com/hashicorp/terraform/terraform/resource_provider.go
index 1a68c86..7d78f67 100644
--- a/vendor/github.com/hashicorp/terraform/terraform/resource_provider.go
+++ b/vendor/github.com/hashicorp/terraform/terraform/resource_provider.go
@@ -1,5 +1,12 @@
 package terraform
 
+import (
+        "fmt"
+
+        multierror "github.com/hashicorp/go-multierror"
+        "github.com/hashicorp/terraform/plugin/discovery"
+)
+
 // ResourceProvider is an interface that must be implemented by any
 // resource provider: the thing that creates and manages the resources in
 // a Terraform configuration.
@@ -154,6 +161,18 @@ type ResourceProvider interface {
         ReadDataApply(*InstanceInfo, *InstanceDiff) (*InstanceState, error)
 }
 
+// ResourceProviderError may be returned when creating a Context if the
+// required providers cannot be satisfied. This error can then be used to
+// format a more useful message for the user.
+type ResourceProviderError struct {
+        Errors []error
+}
+
+func (e *ResourceProviderError) Error() string {
+        // use multierror to format the default output
+        return multierror.Append(nil, e.Errors...).Error()
+}
+
 // ResourceProviderCloser is an interface that providers that can close
 // connections that aren't needed anymore must implement.
 type ResourceProviderCloser interface {
@@ -171,6 +190,50 @@ type DataSource struct {
         Name string
 }
 
+// ResourceProviderResolver is an interface implemented by objects that are
+// able to resolve a given set of resource provider version constraints
+// into ResourceProviderFactory callbacks.
+type ResourceProviderResolver interface {
+        // Given a constraint map, return a ResourceProviderFactory for each
+        // requested provider. If some or all of the constraints cannot be
+        // satisfied, return a non-nil slice of errors describing the problems.
+        ResolveProviders(reqd discovery.PluginRequirements) (map[string]ResourceProviderFactory, []error)
+}
+
+// ResourceProviderResolverFunc wraps a callback function and turns it into
+// a ResourceProviderResolver implementation, for convenience in situations
+// where a function and its associated closure are sufficient as a resolver
+// implementation.
+type ResourceProviderResolverFunc func(reqd discovery.PluginRequirements) (map[string]ResourceProviderFactory, []error)
+
+// ResolveProviders implements ResourceProviderResolver by calling the
+// wrapped function.
+func (f ResourceProviderResolverFunc) ResolveProviders(reqd discovery.PluginRequirements) (map[string]ResourceProviderFactory, []error) {
+        return f(reqd)
+}
+
+// ResourceProviderResolverFixed returns a ResourceProviderResolver that
+// has a fixed set of provider factories provided by the caller. The returned
+// resolver ignores version constraints entirely and just returns the given
+// factory for each requested provider name.
+//
+// This function is primarily used in tests, to provide mock providers or
+// in-process providers under test.
+func ResourceProviderResolverFixed(factories map[string]ResourceProviderFactory) ResourceProviderResolver {
+        return ResourceProviderResolverFunc(func(reqd discovery.PluginRequirements) (map[string]ResourceProviderFactory, []error) {
+                ret := make(map[string]ResourceProviderFactory, len(reqd))
+                var errs []error
+                for name := range reqd {
+                        if factory, exists := factories[name]; exists {
+                                ret[name] = factory
+                        } else {
+                                errs = append(errs, fmt.Errorf("provider %q is not available", name))
+                        }
+                }
+                return ret, errs
+        })
+}
+
 // ResourceProviderFactory is a function type that creates a new instance
 // of a resource provider.
 type ResourceProviderFactory func() (ResourceProvider, error)
@@ -202,3 +265,21 @@ func ProviderHasDataSource(p ResourceProvider, n string) bool {
 
         return false
 }
+
+// resourceProviderFactories matches available plugins to the given version
+// requirements to produce a map of compatible provider plugins if possible,
+// or an error if the currently-available plugins are insufficient.
+//
+// This should be called only with configurations that have passed calls
+// to config.Validate(), which ensures that all of the given version
+// constraints are valid. It will panic if any invalid constraints are present.
+func resourceProviderFactories(resolver ResourceProviderResolver, reqd discovery.PluginRequirements) (map[string]ResourceProviderFactory, error) {
+        ret, errs := resolver.ResolveProviders(reqd)
+        if errs != nil {
+                return nil, &ResourceProviderError{
+                        Errors: errs,
+                }
+        }
+
+        return ret, nil
+}
diff --git a/vendor/github.com/hashicorp/terraform/terraform/state.go b/vendor/github.com/hashicorp/terraform/terraform/state.go
index 074b682..0c46194 100644
--- a/vendor/github.com/hashicorp/terraform/terraform/state.go
+++ b/vendor/github.com/hashicorp/terraform/terraform/state.go
@@ -533,6 +533,43 @@ func (s *State) equal(other *State) bool {
         return true
 }
 
+// MarshalEqual is similar to Equal but provides a stronger definition of
+// "equal", where two states are equal if and only if their serialized form
+// is byte-for-byte identical.
+//
+// This is primarily useful for callers that are trying to save snapshots
+// of state to persistent storage, allowing them to detect when a new
+// snapshot must be taken.
+//
+// Note that the serial number and lineage are included in the serialized form,
+// so it's the caller's responsibility to properly manage these attributes
+// so that this method is only called on two states that have the same
+// serial and lineage, unless detecting such differences is desired.
+func (s *State) MarshalEqual(other *State) bool {
+        if s == nil && other == nil {
+                return true
+        } else if s == nil || other == nil {
+                return false
+        }
+
+        recvBuf := &bytes.Buffer{}
+        otherBuf := &bytes.Buffer{}
+
+        err := WriteState(s, recvBuf)
+        if err != nil {
+                // should never happen, since we're writing to a buffer
+                panic(err)
+        }
+
+        err = WriteState(other, otherBuf)
+        if err != nil {
+                // should never happen, since we're writing to a buffer
+                panic(err)
+        }
+
+        return bytes.Equal(recvBuf.Bytes(), otherBuf.Bytes())
+}
+
 type StateAgeComparison int
 
 const (
@@ -603,6 +640,10 @@ func (s *State) SameLineage(other *State) bool {
 // DeepCopy performs a deep copy of the state structure and returns
 // a new structure.
 func (s *State) DeepCopy() *State {
+        if s == nil {
+                return nil
+        }
+
         copy, err := copystructure.Config{Lock: true}.Copy(s)
         if err != nil {
                 panic(err)
@@ -611,30 +652,6 @@ func (s *State) DeepCopy() *State {
         return copy.(*State)
 }
 
-// IncrementSerialMaybe increments the serial number of this state
-// if it different from the other state.
-func (s *State) IncrementSerialMaybe(other *State) {
-        if s == nil {
-                return
-        }
-        if other == nil {
-                return
-        }
-        s.Lock()
-        defer s.Unlock()
-
-        if s.Serial > other.Serial {
-                return
-        }
-        if other.TFVersion != s.TFVersion || !s.equal(other) {
-                if other.Serial > s.Serial {
-                        s.Serial = other.Serial
-                }
-
-                s.Serial++
-        }
-}
-
 // FromFutureTerraform checks if this state was written by a Terraform
 // version from the future.
 func (s *State) FromFutureTerraform() bool {
@@ -660,6 +677,7 @@ func (s *State) init() {
         if s.Version == 0 {
                 s.Version = StateVersion
         }
+
         if s.moduleByPath(rootModulePath) == nil {
                 s.addModule(rootModulePath)
         }
diff --git a/vendor/github.com/hashicorp/terraform/terraform/test_failure b/vendor/github.com/hashicorp/terraform/terraform/test_failure
new file mode 100644
index 0000000..5d3ad1a
--- /dev/null
+++ b/vendor/github.com/hashicorp/terraform/terraform/test_failure
@@ -0,0 +1,9 @@
+--- FAIL: TestContext2Plan_moduleProviderInherit (0.01s)
+        context_plan_test.go:552: bad: []string{"child"}
+map[string]dag.Vertex{}
+"module.middle.null"
+map[string]dag.Vertex{}
+"module.middle.module.inner.null"
+map[string]dag.Vertex{}
+"aws"
+FAIL
diff --git a/vendor/github.com/hashicorp/terraform/terraform/transform_resource_refresh_plannable.go b/vendor/github.com/hashicorp/terraform/terraform/transform_resource_refresh_plannable.go
deleted file mode 100644
index 35358a3..0000000
--- a/vendor/github.com/hashicorp/terraform/terraform/transform_resource_refresh_plannable.go
+++ /dev/null
@@ -1,55 +0,0 @@
-package terraform
-
-import (
-        "fmt"
-        "log"
-)
-
-// ResourceRefreshPlannableTransformer is a GraphTransformer that replaces any
-// nodes that don't have state yet exist in config with
-// NodePlannableResourceInstance.
-//
-// This transformer is used when expanding count on managed resource nodes
-// during the refresh phase to ensure that data sources that have
-// interpolations that depend on resources existing in the graph can be walked
-// properly.
-type ResourceRefreshPlannableTransformer struct {
-        // The full global state.
-        State *State
-}
-
-// Transform implements GraphTransformer for
-// ResourceRefreshPlannableTransformer.
-func (t *ResourceRefreshPlannableTransformer) Transform(g *Graph) error {
-nextVertex:
-        for _, v := range g.Vertices() {
-                addr := v.(*NodeRefreshableManagedResourceInstance).Addr
-
-                // Find the state for this address, if there is one
-                filter := &StateFilter{State: t.State}
-                results, err := filter.Filter(addr.String())
-                if err != nil {
-                        return err
-                }
-
-                // Check to see if we have a state for this resource. If we do, skip this
-                // node.
-                for _, result := range results {
-                        if _, ok := result.Value.(*ResourceState); ok {
-                                continue nextVertex
-                        }
-                }
-                // If we don't, convert this resource to a NodePlannableResourceInstance node
-                // with all of the data we need to make it happen.
-                log.Printf("[TRACE] No state for %s, converting to NodePlannableResourceInstance", addr.String())
-                new := &NodePlannableResourceInstance{
-                        NodeAbstractResource: v.(*NodeRefreshableManagedResourceInstance).NodeAbstractResource,
-                }
-                // Replace the node in the graph
-                if !g.Replace(v, new) {
-                        return fmt.Errorf("ResourceRefreshPlannableTransformer: Could not replace node %#v with %#v", v, new)
-                }
-        }
-
-        return nil
-}
diff --git a/vendor/github.com/hashicorp/terraform/terraform/transform_targets.go b/vendor/github.com/hashicorp/terraform/terraform/transform_targets.go
index 125f9e3..4f117b4 100644
--- a/vendor/github.com/hashicorp/terraform/terraform/transform_targets.go
+++ b/vendor/github.com/hashicorp/terraform/terraform/transform_targets.go
@@ -41,6 +41,12 @@ type TargetsTransformer struct {
         // that already have the targets parsed
         ParsedTargets []ResourceAddress
 
+        // If set, the index portions of resource addresses will be ignored
+        // for comparison. This is used when transforming a graph where
+        // counted resources have not yet been expanded, since otherwise
+        // the unexpanded nodes (which never have indices) would not match.
+        IgnoreIndices bool
+
         // Set to true when we're in a `terraform destroy` or a
         // `terraform plan -destroy`
         Destroy bool
@@ -199,7 +205,12 @@ func (t *TargetsTransformer) nodeIsTarget(
 
         addr := r.ResourceAddr()
         for _, targetAddr := range addrs {
-                if targetAddr.Equals(addr) {
+                if t.IgnoreIndices {
+                        // targetAddr is not a pointer, so we can safely mutate it without
+                        // interfering with references elsewhere.
+                        targetAddr.Index = -1
+                }
+                if targetAddr.Contains(addr) {
                         return true
                 }
         }
diff --git a/vendor/github.com/hashicorp/terraform/terraform/util.go b/vendor/github.com/hashicorp/terraform/terraform/util.go
index f41f0d7..752241a 100644
--- a/vendor/github.com/hashicorp/terraform/terraform/util.go
+++ b/vendor/github.com/hashicorp/terraform/terraform/util.go
@@ -2,7 +2,8 @@ package terraform
 
 import (
         "sort"
-        "strings"
+
+        "github.com/hashicorp/terraform/config"
 )
 
 // Semaphore is a wrapper around a channel to provide
@@ -47,21 +48,8 @@ func (s Semaphore) Release() {
         }
 }
 
-// resourceProvider returns the provider name for the given type.
-func resourceProvider(t, alias string) string {
-        if alias != "" {
-                return alias
-        }
-
-        idx := strings.IndexRune(t, '_')
-        if idx == -1 {
-                // If no underscores, the resource name is assumed to be
-                // also the provider name, e.g. if the provider exposes
-                // only a single resource of each type.
-                return t
-        }
-
-        return t[:idx]
+func resourceProvider(resourceType, explicitProvider string) string {
+        return config.ResourceProviderFullName(resourceType, explicitProvider)
 }
 
 // strSliceContains checks if a given string is contained in a slice
diff --git a/vendor/github.com/hashicorp/terraform/terraform/version.go b/vendor/github.com/hashicorp/terraform/terraform/version.go
index cdfb8fb..d61b11e 100644
--- a/vendor/github.com/hashicorp/terraform/terraform/version.go
+++ b/vendor/github.com/hashicorp/terraform/terraform/version.go
@@ -7,12 +7,12 @@ import (
 )
 
 // The main version number that is being run at the moment.
-const Version = "0.9.8"
+const Version = "0.10.0"
 
 // A pre-release marker for the version. If this is "" (empty string)
 // then it means that it is a final release. Otherwise, this is a pre-release
 // such as "dev" (in development), "beta", "rc1", etc.
-var VersionPrerelease = ""
+var VersionPrerelease = "dev"
 
 // SemVersion is an instance of version.Version. This has the secondary
 // benefit of verifying during tests and init time that our version is a
diff --git a/vendor/golang.org/x/crypto/cast5/cast5.go b/vendor/golang.org/x/crypto/cast5/cast5.go
new file mode 100644
index 0000000..0b4af37
--- /dev/null
+++ b/vendor/golang.org/x/crypto/cast5/cast5.go
@@ -0,0 +1,526 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package cast5 implements CAST5, as defined in RFC 2144. CAST5 is a common
+// OpenPGP cipher.
+package cast5 // import "golang.org/x/crypto/cast5"
+
+import "errors"
+
+const BlockSize = 8
+const KeySize = 16
+
+type Cipher struct {
+        masking [16]uint32
+        rotate  [16]uint8
+}
+
+func NewCipher(key []byte) (c *Cipher, err error) {
+        if len(key) != KeySize {
+                return nil, errors.New("CAST5: keys must be 16 bytes")
+        }
+
+        c = new(Cipher)
+        c.keySchedule(key)
+        return
+}
+
+func (c *Cipher) BlockSize() int {
+        return BlockSize
+}
+
+func (c *Cipher) Encrypt(dst, src []byte) {
+        l := uint32(src[0])<<24 | uint32(src[1])<<16 | uint32(src[2])<<8 | uint32(src[3])
+        r := uint32(src[4])<<24 | uint32(src[5])<<16 | uint32(src[6])<<8 | uint32(src[7])
+
+        l, r = r, l^f1(r, c.masking[0], c.rotate[0])
+        l, r = r, l^f2(r, c.masking[1], c.rotate[1])
+        l, r = r, l^f3(r, c.masking[2], c.rotate[2])
+        l, r = r, l^f1(r, c.masking[3], c.rotate[3])
+
+        l, r = r, l^f2(r, c.masking[4], c.rotate[4])
+        l, r = r, l^f3(r, c.masking[5], c.rotate[5])
+        l, r = r, l^f1(r, c.masking[6], c.rotate[6])
+        l, r = r, l^f2(r, c.masking[7], c.rotate[7])
+
+        l, r = r, l^f3(r, c.masking[8], c.rotate[8])
+        l, r = r, l^f1(r, c.masking[9], c.rotate[9])
+        l, r = r, l^f2(r, c.masking[10], c.rotate[10])
+        l, r = r, l^f3(r, c.masking[11], c.rotate[11])
+
+        l, r = r, l^f1(r, c.masking[12], c.rotate[12])
+        l, r = r, l^f2(r, c.masking[13], c.rotate[13])
+        l, r = r, l^f3(r, c.masking[14], c.rotate[14])
+        l, r = r, l^f1(r, c.masking[15], c.rotate[15])
+
+        dst[0] = uint8(r >> 24)
+        dst[1] = uint8(r >> 16)
+        dst[2] = uint8(r >> 8)
+        dst[3] = uint8(r)
+        dst[4] = uint8(l >> 24)
+        dst[5] = uint8(l >> 16)
+        dst[6] = uint8(l >> 8)
+        dst[7] = uint8(l)
+}
+
+func (c *Cipher) Decrypt(dst, src []byte) {
+        l := uint32(src[0])<<24 | uint32(src[1])<<16 | uint32(src[2])<<8 | uint32(src[3])
+        r := uint32(src[4])<<24 | uint32(src[5])<<16 | uint32(src[6])<<8 | uint32(src[7])
+
+        l, r = r, l^f1(r, c.masking[15], c.rotate[15])
+        l, r = r, l^f3(r, c.masking[14], c.rotate[14])
+        l, r = r, l^f2(r, c.masking[13], c.rotate[13])
+        l, r = r, l^f1(r, c.masking[12], c.rotate[12])
+
+        l, r = r, l^f3(r, c.masking[11], c.rotate[11])
+        l, r = r, l^f2(r, c.masking[10], c.rotate[10])
+        l, r = r, l^f1(r, c.masking[9], c.rotate[9])
+        l, r = r, l^f3(r, c.masking[8], c.rotate[8])
+
+        l, r = r, l^f2(r, c.masking[7], c.rotate[7])
+        l, r = r, l^f1(r, c.masking[6], c.rotate[6])
+        l, r = r, l^f3(r, c.masking[5], c.rotate[5])
+        l, r = r, l^f2(r, c.masking[4], c.rotate[4])
+
+        l, r = r, l^f1(r, c.masking[3], c.rotate[3])
+        l, r = r, l^f3(r, c.masking[2], c.rotate[2])
+        l, r = r, l^f2(r, c.masking[1], c.rotate[1])
+        l, r = r, l^f1(r, c.masking[0], c.rotate[0])
+
+        dst[0] = uint8(r >> 24)
+        dst[1] = uint8(r >> 16)
+        dst[2] = uint8(r >> 8)
+        dst[3] = uint8(r)
+        dst[4] = uint8(l >> 24)
+        dst[5] = uint8(l >> 16)
+        dst[6] = uint8(l >> 8)
+        dst[7] = uint8(l)
+}
+
+type keyScheduleA [4][7]uint8
+type keyScheduleB [4][5]uint8
+
+// keyScheduleRound contains the magic values for a round of the key schedule.
+// The keyScheduleA deals with the lines like:
+//   z0z1z2z3 = x0x1x2x3 ^ S5[xD] ^ S6[xF] ^ S7[xC] ^ S8[xE] ^ S7[x8]
+// Conceptually, both x and z are in the same array, x first. The first
+// element describes which word of this array gets written to and the
+// second, which word gets read. So, for the line above, it's "4, 0", because
+// it's writing to the first word of z, which, being after x, is word 4, and
+// reading from the first word of x: word 0.
+//
+// Next are the indexes into the S-boxes. Now the array is treated as bytes. So
+// "xD" is 0xd. The first byte of z is written as "16 + 0", just to be clear
+// that it's z that we're indexing.
+//
+// keyScheduleB deals with lines like:
+//   K1 = S5[z8] ^ S6[z9] ^ S7[z7] ^ S8[z6] ^ S5[z2]
+// "K1" is ignored because key words are always written in order. So the five
+// elements are the S-box indexes. They use the same form as in keyScheduleA,
+// above.
+
+type keyScheduleRound struct{}
+type keySchedule []keyScheduleRound
+
+var schedule = []struct {
+        a keyScheduleA
+        b keyScheduleB
+}{
+        {
+                keyScheduleA{
+                        {4, 0, 0xd, 0xf, 0xc, 0xe, 0x8},
+                        {5, 2, 16 + 0, 16 + 2, 16 + 1, 16 + 3, 0xa},
+                        {6, 3, 16 + 7, 16 + 6, 16 + 5, 16 + 4, 9},
+                        {7, 1, 16 + 0xa, 16 + 9, 16 + 0xb, 16 + 8, 0xb},
+                },
+                keyScheduleB{
+                        {16 + 8, 16 + 9, 16 + 7, 16 + 6, 16 + 2},
+                        {16 + 0xa, 16 + 0xb, 16 + 5, 16 + 4, 16 + 6},
+                        {16 + 0xc, 16 + 0xd, 16 + 3, 16 + 2, 16 + 9},
+                        {16 + 0xe, 16 + 0xf, 16 + 1, 16 + 0, 16 + 0xc},
+                },
+        },
+        {
+                keyScheduleA{
+                        {0, 6, 16 + 5, 16 + 7, 16 + 4, 16 + 6, 16 + 0},
+                        {1, 4, 0, 2, 1, 3, 16 + 2},
+                        {2, 5, 7, 6, 5, 4, 16 + 1},
+                        {3, 7, 0xa, 9, 0xb, 8, 16 + 3},
+                },
+                keyScheduleB{
+                        {3, 2, 0xc, 0xd, 8},
+                        {1, 0, 0xe, 0xf, 0xd},
+                        {7, 6, 8, 9, 3},
+                        {5, 4, 0xa, 0xb, 7},
+                },
+        },
+        {
+                keyScheduleA{
+                        {4, 0, 0xd, 0xf, 0xc, 0xe, 8},
+                        {5, 2, 16 + 0, 16 + 2, 16 + 1, 16 + 3, 0xa},
+                        {6, 3, 16 + 7, 16 + 6, 16 + 5, 16 + 4, 9},
+                        {7, 1, 16 + 0xa, 16 + 9, 16 + 0xb, 16 + 8, 0xb},
+                },
+                keyScheduleB{
+                        {16 + 3, 16 + 2, 16 + 0xc, 16 + 0xd, 16 + 9},
+                        {16 + 1, 16 + 0, 16 + 0xe, 16 + 0xf, 16 + 0xc},
+                        {16 + 7, 16 + 6, 16 + 8, 16 + 9, 16 + 2},
+                        {16 + 5, 16 + 4, 16 + 0xa, 16 + 0xb, 16 + 6},
+                },
+        },
+        {
+                keyScheduleA{
+                        {0, 6, 16 + 5, 16 + 7, 16 + 4, 16 + 6, 16 + 0},
+                        {1, 4, 0, 2, 1, 3, 16 + 2},
+                        {2, 5, 7, 6, 5, 4, 16 + 1},
+                        {3, 7, 0xa, 9, 0xb, 8, 16 + 3},
+                },
+                keyScheduleB{
+                        {8, 9, 7, 6, 3},
+                        {0xa, 0xb, 5, 4, 7},
+                        {0xc, 0xd, 3, 2, 8},
+                        {0xe, 0xf, 1, 0, 0xd},
+                },
+        },
+}
+
+func (c *Cipher) keySchedule(in []byte) {
+        var t [8]uint32
+        var k [32]uint32
+
+        for i := 0; i < 4; i++ {
+                j := i * 4
+                t[i] = uint32(in[j])<<24 | uint32(in[j+1])<<16 | uint32(in[j+2])<<8 | uint32(in[j+3])
+        }
+
+        x := []byte{6, 7, 4, 5}
+        ki := 0
+
+        for half := 0; half < 2; half++ {
+                for _, round := range schedule {
+                        for j := 0; j < 4; j++ {
+                                var a [7]uint8
+                                copy(a[:], round.a[j][:])
+                                w := t[a[1]]
+                                w ^= sBox[4][(t[a[2]>>2]>>(24-8*(a[2]&3)))&0xff]
+                                w ^= sBox[5][(t[a[3]>>2]>>(24-8*(a[3]&3)))&0xff]
+                                w ^= sBox[6][(t[a[4]>>2]>>(24-8*(a[4]&3)))&0xff]
+                                w ^= sBox[7][(t[a[5]>>2]>>(24-8*(a[5]&3)))&0xff]
+                                w ^= sBox[x[j]][(t[a[6]>>2]>>(24-8*(a[6]&3)))&0xff]
+                                t[a[0]] = w
+                        }
+
+                        for j := 0; j < 4; j++ {
+                                var b [5]uint8
+                                copy(b[:], round.b[j][:])
+                                w := sBox[4][(t[b[0]>>2]>>(24-8*(b[0]&3)))&0xff]
+                                w ^= sBox[5][(t[b[1]>>2]>>(24-8*(b[1]&3)))&0xff]
+                                w ^= sBox[6][(t[b[2]>>2]>>(24-8*(b[2]&3)))&0xff]
+                                w ^= sBox[7][(t[b[3]>>2]>>(24-8*(b[3]&3)))&0xff]
+                                w ^= sBox[4+j][(t[b[4]>>2]>>(24-8*(b[4]&3)))&0xff]
+                                k[ki] = w
+                                ki++
+                        }
+                }
+        }
+
+        for i := 0; i < 16; i++ {
+                c.masking[i] = k[i]
+                c.rotate[i] = uint8(k[16+i] & 0x1f)
+        }
+}
+
+// These are the three 'f' functions. See RFC 2144, section 2.2.
+func f1(d, m uint32, r uint8) uint32 {
+        t := m + d
+        I := (t << r) | (t >> (32 - r))
+        return ((sBox[0][I>>24] ^ sBox[1][(I>>16)&0xff]) - sBox[2][(I>>8)&0xff]) + sBox[3][I&0xff]
+}
+
+func f2(d, m uint32, r uint8) uint32 {
+        t := m ^ d
+        I := (t << r) | (t >> (32 - r))
+        return ((sBox[0][I>>24] - sBox[1][(I>>16)&0xff]) + sBox[2][(I>>8)&0xff]) ^ sBox[3][I&0xff]
+}
+
+func f3(d, m uint32, r uint8) uint32 {
+        t := m - d
+        I := (t << r) | (t >> (32 - r))
+        return ((sBox[0][I>>24] + sBox[1][(I>>16)&0xff]) ^ sBox[2][(I>>8)&0xff]) - sBox[3][I&0xff]
+}
+
+var sBox = [8][256]uint32{
+        {
+                0x30fb40d4, 0x9fa0ff0b, 0x6beccd2f, 0x3f258c7a, 0x1e213f2f, 0x9c004dd3, 0x6003e540, 0xcf9fc949,
+                0xbfd4af27, 0x88bbbdb5, 0xe2034090, 0x98d09675, 0x6e63a0e0, 0x15c361d2, 0xc2e7661d, 0x22d4ff8e,
+                0x28683b6f, 0xc07fd059, 0xff2379c8, 0x775f50e2, 0x43c340d3, 0xdf2f8656, 0x887ca41a, 0xa2d2bd2d,
+                0xa1c9e0d6, 0x346c4819, 0x61b76d87, 0x22540f2f, 0x2abe32e1, 0xaa54166b, 0x22568e3a, 0xa2d341d0,
+                0x66db40c8, 0xa784392f, 0x004dff2f, 0x2db9d2de, 0x97943fac, 0x4a97c1d8, 0x527644b7, 0xb5f437a7,
+                0xb82cbaef, 0xd751d159, 0x6ff7f0ed, 0x5a097a1f, 0x827b68d0, 0x90ecf52e, 0x22b0c054, 0xbc8e5935,
+                0x4b6d2f7f, 0x50bb64a2, 0xd2664910, 0xbee5812d, 0xb7332290, 0xe93b159f, 0xb48ee411, 0x4bff345d,
+                0xfd45c240, 0xad31973f, 0xc4f6d02e, 0x55fc8165, 0xd5b1caad, 0xa1ac2dae, 0xa2d4b76d, 0xc19b0c50,
+                0x882240f2, 0x0c6e4f38, 0xa4e4bfd7, 0x4f5ba272, 0x564c1d2f, 0xc59c5319, 0xb949e354, 0xb04669fe,
+                0xb1b6ab8a, 0xc71358dd, 0x6385c545, 0x110f935d, 0x57538ad5, 0x6a390493, 0xe63d37e0, 0x2a54f6b3,
+                0x3a787d5f, 0x6276a0b5, 0x19a6fcdf, 0x7a42206a, 0x29f9d4d5, 0xf61b1891, 0xbb72275e, 0xaa508167,
+                0x38901091, 0xc6b505eb, 0x84c7cb8c, 0x2ad75a0f, 0x874a1427, 0xa2d1936b, 0x2ad286af, 0xaa56d291,
+                0xd7894360, 0x425c750d, 0x93b39e26, 0x187184c9, 0x6c00b32d, 0x73e2bb14, 0xa0bebc3c, 0x54623779,
+                0x64459eab, 0x3f328b82, 0x7718cf82, 0x59a2cea6, 0x04ee002e, 0x89fe78e6, 0x3fab0950, 0x325ff6c2,
+                0x81383f05, 0x6963c5c8, 0x76cb5ad6, 0xd49974c9, 0xca180dcf, 0x380782d5, 0xc7fa5cf6, 0x8ac31511,
+                0x35e79e13, 0x47da91d0, 0xf40f9086, 0xa7e2419e, 0x31366241, 0x051ef495, 0xaa573b04, 0x4a805d8d,
+                0x548300d0, 0x00322a3c, 0xbf64cddf, 0xba57a68e, 0x75c6372b, 0x50afd341, 0xa7c13275, 0x915a0bf5,
+                0x6b54bfab, 0x2b0b1426, 0xab4cc9d7, 0x449ccd82, 0xf7fbf265, 0xab85c5f3, 0x1b55db94, 0xaad4e324,
+                0xcfa4bd3f, 0x2deaa3e2, 0x9e204d02, 0xc8bd25ac, 0xeadf55b3, 0xd5bd9e98, 0xe31231b2, 0x2ad5ad6c,
+                0x954329de, 0xadbe4528, 0xd8710f69, 0xaa51c90f, 0xaa786bf6, 0x22513f1e, 0xaa51a79b, 0x2ad344cc,
+                0x7b5a41f0, 0xd37cfbad, 0x1b069505, 0x41ece491, 0xb4c332e6, 0x032268d4, 0xc9600acc, 0xce387e6d,
+                0xbf6bb16c, 0x6a70fb78, 0x0d03d9c9, 0xd4df39de, 0xe01063da, 0x4736f464, 0x5ad328d8, 0xb347cc96,
+                0x75bb0fc3, 0x98511bfb, 0x4ffbcc35, 0xb58bcf6a, 0xe11f0abc, 0xbfc5fe4a, 0xa70aec10, 0xac39570a,
+                0x3f04442f, 0x6188b153, 0xe0397a2e, 0x5727cb79, 0x9ceb418f, 0x1cacd68d, 0x2ad37c96, 0x0175cb9d,
+                0xc69dff09, 0xc75b65f0, 0xd9db40d8, 0xec0e7779, 0x4744ead4, 0xb11c3274, 0xdd24cb9e, 0x7e1c54bd,
+                0xf01144f9, 0xd2240eb1, 0x9675b3fd, 0xa3ac3755, 0xd47c27af, 0x51c85f4d, 0x56907596, 0xa5bb15e6,
+                0x580304f0, 0xca042cf1, 0x011a37ea, 0x8dbfaadb, 0x35ba3e4a, 0x3526ffa0, 0xc37b4d09, 0xbc306ed9,
+                0x98a52666, 0x5648f725, 0xff5e569d, 0x0ced63d0, 0x7c63b2cf, 0x700b45e1, 0xd5ea50f1, 0x85a92872,
+                0xaf1fbda7, 0xd4234870, 0xa7870bf3, 0x2d3b4d79, 0x42e04198, 0x0cd0ede7, 0x26470db8, 0xf881814c,
+                0x474d6ad7, 0x7c0c5e5c, 0xd1231959, 0x381b7298, 0xf5d2f4db, 0xab838653, 0x6e2f1e23, 0x83719c9e,
+                0xbd91e046, 0x9a56456e, 0xdc39200c, 0x20c8c571, 0x962bda1c, 0xe1e696ff, 0xb141ab08, 0x7cca89b9,
+                0x1a69e783, 0x02cc4843, 0xa2f7c579, 0x429ef47d, 0x427b169c, 0x5ac9f049, 0xdd8f0f00, 0x5c8165bf,
+        },
+        {
+                0x1f201094, 0xef0ba75b, 0x69e3cf7e, 0x393f4380, 0xfe61cf7a, 0xeec5207a, 0x55889c94, 0x72fc0651,
+                0xada7ef79, 0x4e1d7235, 0xd55a63ce, 0xde0436ba, 0x99c430ef, 0x5f0c0794, 0x18dcdb7d, 0xa1d6eff3,
+                0xa0b52f7b, 0x59e83605, 0xee15b094, 0xe9ffd909, 0xdc440086, 0xef944459, 0xba83ccb3, 0xe0c3cdfb,
+                0xd1da4181, 0x3b092ab1, 0xf997f1c1, 0xa5e6cf7b, 0x01420ddb, 0xe4e7ef5b, 0x25a1ff41, 0xe180f806,
+                0x1fc41080, 0x179bee7a, 0xd37ac6a9, 0xfe5830a4, 0x98de8b7f, 0x77e83f4e, 0x79929269, 0x24fa9f7b,
+                0xe113c85b, 0xacc40083, 0xd7503525, 0xf7ea615f, 0x62143154, 0x0d554b63, 0x5d681121, 0xc866c359,
+                0x3d63cf73, 0xcee234c0, 0xd4d87e87, 0x5c672b21, 0x071f6181, 0x39f7627f, 0x361e3084, 0xe4eb573b,
+                0x602f64a4, 0xd63acd9c, 0x1bbc4635, 0x9e81032d, 0x2701f50c, 0x99847ab4, 0xa0e3df79, 0xba6cf38c,
+                0x10843094, 0x2537a95e, 0xf46f6ffe, 0xa1ff3b1f, 0x208cfb6a, 0x8f458c74, 0xd9e0a227, 0x4ec73a34,
+                0xfc884f69, 0x3e4de8df, 0xef0e0088, 0x3559648d, 0x8a45388c, 0x1d804366, 0x721d9bfd, 0xa58684bb,
+                0xe8256333, 0x844e8212, 0x128d8098, 0xfed33fb4, 0xce280ae1, 0x27e19ba5, 0xd5a6c252, 0xe49754bd,
+                0xc5d655dd, 0xeb667064, 0x77840b4d, 0xa1b6a801, 0x84db26a9, 0xe0b56714, 0x21f043b7, 0xe5d05860,
+                0x54f03084, 0x066ff472, 0xa31aa153, 0xdadc4755, 0xb5625dbf, 0x68561be6, 0x83ca6b94, 0x2d6ed23b,
+                0xeccf01db, 0xa6d3d0ba, 0xb6803d5c, 0xaf77a709, 0x33b4a34c, 0x397bc8d6, 0x5ee22b95, 0x5f0e5304,
+                0x81ed6f61, 0x20e74364, 0xb45e1378, 0xde18639b, 0x881ca122, 0xb96726d1, 0x8049a7e8, 0x22b7da7b,
+                0x5e552d25, 0x5272d237, 0x79d2951c, 0xc60d894c, 0x488cb402, 0x1ba4fe5b, 0xa4b09f6b, 0x1ca815cf,
+                0xa20c3005, 0x8871df63, 0xb9de2fcb, 0x0cc6c9e9, 0x0beeff53, 0xe3214517, 0xb4542835, 0x9f63293c,
+                0xee41e729, 0x6e1d2d7c, 0x50045286, 0x1e6685f3, 0xf33401c6, 0x30a22c95, 0x31a70850, 0x60930f13,
+                0x73f98417, 0xa1269859, 0xec645c44, 0x52c877a9, 0xcdff33a6, 0xa02b1741, 0x7cbad9a2, 0x2180036f,
+                0x50d99c08, 0xcb3f4861, 0xc26bd765, 0x64a3f6ab, 0x80342676, 0x25a75e7b, 0xe4e6d1fc, 0x20c710e6,
+                0xcdf0b680, 0x17844d3b, 0x31eef84d, 0x7e0824e4, 0x2ccb49eb, 0x846a3bae, 0x8ff77888, 0xee5d60f6,
+                0x7af75673, 0x2fdd5cdb, 0xa11631c1, 0x30f66f43, 0xb3faec54, 0x157fd7fa, 0xef8579cc, 0xd152de58,
+                0xdb2ffd5e, 0x8f32ce19, 0x306af97a, 0x02f03ef8, 0x99319ad5, 0xc242fa0f, 0xa7e3ebb0, 0xc68e4906,
+                0xb8da230c, 0x80823028, 0xdcdef3c8, 0xd35fb171, 0x088a1bc8, 0xbec0c560, 0x61a3c9e8, 0xbca8f54d,
+                0xc72feffa, 0x22822e99, 0x82c570b4, 0xd8d94e89, 0x8b1c34bc, 0x301e16e6, 0x273be979, 0xb0ffeaa6,
+                0x61d9b8c6, 0x00b24869, 0xb7ffce3f, 0x08dc283b, 0x43daf65a, 0xf7e19798, 0x7619b72f, 0x8f1c9ba4,
+                0xdc8637a0, 0x16a7d3b1, 0x9fc393b7, 0xa7136eeb, 0xc6bcc63e, 0x1a513742, 0xef6828bc, 0x520365d6,
+                0x2d6a77ab, 0x3527ed4b, 0x821fd216, 0x095c6e2e, 0xdb92f2fb, 0x5eea29cb, 0x145892f5, 0x91584f7f,
+                0x5483697b, 0x2667a8cc, 0x85196048, 0x8c4bacea, 0x833860d4, 0x0d23e0f9, 0x6c387e8a, 0x0ae6d249,
+                0xb284600c, 0xd835731d, 0xdcb1c647, 0xac4c56ea, 0x3ebd81b3, 0x230eabb0, 0x6438bc87, 0xf0b5b1fa,
+                0x8f5ea2b3, 0xfc184642, 0x0a036b7a, 0x4fb089bd, 0x649da589, 0xa345415e, 0x5c038323, 0x3e5d3bb9,
+                0x43d79572, 0x7e6dd07c, 0x06dfdf1e, 0x6c6cc4ef, 0x7160a539, 0x73bfbe70, 0x83877605, 0x4523ecf1,
+        },
+        {
+                0x8defc240, 0x25fa5d9f, 0xeb903dbf, 0xe810c907, 0x47607fff, 0x369fe44b, 0x8c1fc644, 0xaececa90,
+                0xbeb1f9bf, 0xeefbcaea, 0xe8cf1950, 0x51df07ae, 0x920e8806, 0xf0ad0548, 0xe13c8d83, 0x927010d5,
+                0x11107d9f, 0x07647db9, 0xb2e3e4d4, 0x3d4f285e, 0xb9afa820, 0xfade82e0, 0xa067268b, 0x8272792e,
+                0x553fb2c0, 0x489ae22b, 0xd4ef9794, 0x125e3fbc, 0x21fffcee, 0x825b1bfd, 0x9255c5ed, 0x1257a240,
+                0x4e1a8302, 0xbae07fff, 0x528246e7, 0x8e57140e, 0x3373f7bf, 0x8c9f8188, 0xa6fc4ee8, 0xc982b5a5,
+                0xa8c01db7, 0x579fc264, 0x67094f31, 0xf2bd3f5f, 0x40fff7c1, 0x1fb78dfc, 0x8e6bd2c1, 0x437be59b,
+                0x99b03dbf, 0xb5dbc64b, 0x638dc0e6, 0x55819d99, 0xa197c81c, 0x4a012d6e, 0xc5884a28, 0xccc36f71,
+                0xb843c213, 0x6c0743f1, 0x8309893c, 0x0feddd5f, 0x2f7fe850, 0xd7c07f7e, 0x02507fbf, 0x5afb9a04,
+                0xa747d2d0, 0x1651192e, 0xaf70bf3e, 0x58c31380, 0x5f98302e, 0x727cc3c4, 0x0a0fb402, 0x0f7fef82,
+                0x8c96fdad, 0x5d2c2aae, 0x8ee99a49, 0x50da88b8, 0x8427f4a0, 0x1eac5790, 0x796fb449, 0x8252dc15,
+                0xefbd7d9b, 0xa672597d, 0xada840d8, 0x45f54504, 0xfa5d7403, 0xe83ec305, 0x4f91751a, 0x925669c2,
+                0x23efe941, 0xa903f12e, 0x60270df2, 0x0276e4b6, 0x94fd6574, 0x927985b2, 0x8276dbcb, 0x02778176,
+                0xf8af918d, 0x4e48f79e, 0x8f616ddf, 0xe29d840e, 0x842f7d83, 0x340ce5c8, 0x96bbb682, 0x93b4b148,
+                0xef303cab, 0x984faf28, 0x779faf9b, 0x92dc560d, 0x224d1e20, 0x8437aa88, 0x7d29dc96, 0x2756d3dc,
+                0x8b907cee, 0xb51fd240, 0xe7c07ce3, 0xe566b4a1, 0xc3e9615e, 0x3cf8209d, 0x6094d1e3, 0xcd9ca341,
+                0x5c76460e, 0x00ea983b, 0xd4d67881, 0xfd47572c, 0xf76cedd9, 0xbda8229c, 0x127dadaa, 0x438a074e,
+                0x1f97c090, 0x081bdb8a, 0x93a07ebe, 0xb938ca15, 0x97b03cff, 0x3dc2c0f8, 0x8d1ab2ec, 0x64380e51,
+                0x68cc7bfb, 0xd90f2788, 0x12490181, 0x5de5ffd4, 0xdd7ef86a, 0x76a2e214, 0xb9a40368, 0x925d958f,
+                0x4b39fffa, 0xba39aee9, 0xa4ffd30b, 0xfaf7933b, 0x6d498623, 0x193cbcfa, 0x27627545, 0x825cf47a,
+                0x61bd8ba0, 0xd11e42d1, 0xcead04f4, 0x127ea392, 0x10428db7, 0x8272a972, 0x9270c4a8, 0x127de50b,
+                0x285ba1c8, 0x3c62f44f, 0x35c0eaa5, 0xe805d231, 0x428929fb, 0xb4fcdf82, 0x4fb66a53, 0x0e7dc15b,
+                0x1f081fab, 0x108618ae, 0xfcfd086d, 0xf9ff2889, 0x694bcc11, 0x236a5cae, 0x12deca4d, 0x2c3f8cc5,
+                0xd2d02dfe, 0xf8ef5896, 0xe4cf52da, 0x95155b67, 0x494a488c, 0xb9b6a80c, 0x5c8f82bc, 0x89d36b45,
+                0x3a609437, 0xec00c9a9, 0x44715253, 0x0a874b49, 0xd773bc40, 0x7c34671c, 0x02717ef6, 0x4feb5536,
+                0xa2d02fff, 0xd2bf60c4, 0xd43f03c0, 0x50b4ef6d, 0x07478cd1, 0x006e1888, 0xa2e53f55, 0xb9e6d4bc,
+                0xa2048016, 0x97573833, 0xd7207d67, 0xde0f8f3d, 0x72f87b33, 0xabcc4f33, 0x7688c55d, 0x7b00a6b0,
+                0x947b0001, 0x570075d2, 0xf9bb88f8, 0x8942019e, 0x4264a5ff, 0x856302e0, 0x72dbd92b, 0xee971b69,
+                0x6ea22fde, 0x5f08ae2b, 0xaf7a616d, 0xe5c98767, 0xcf1febd2, 0x61efc8c2, 0xf1ac2571, 0xcc8239c2,
+                0x67214cb8, 0xb1e583d1, 0xb7dc3e62, 0x7f10bdce, 0xf90a5c38, 0x0ff0443d, 0x606e6dc6, 0x60543a49,
+                0x5727c148, 0x2be98a1d, 0x8ab41738, 0x20e1be24, 0xaf96da0f, 0x68458425, 0x99833be5, 0x600d457d,
+                0x282f9350, 0x8334b362, 0xd91d1120, 0x2b6d8da0, 0x642b1e31, 0x9c305a00, 0x52bce688, 0x1b03588a,
+                0xf7baefd5, 0x4142ed9c, 0xa4315c11, 0x83323ec5, 0xdfef4636, 0xa133c501, 0xe9d3531c, 0xee353783,
+        },
+        {
+                0x9db30420, 0x1fb6e9de, 0xa7be7bef, 0xd273a298, 0x4a4f7bdb, 0x64ad8c57, 0x85510443, 0xfa020ed1,
+                0x7e287aff, 0xe60fb663, 0x095f35a1, 0x79ebf120, 0xfd059d43, 0x6497b7b1, 0xf3641f63, 0x241e4adf,
+                0x28147f5f, 0x4fa2b8cd, 0xc9430040, 0x0cc32220, 0xfdd30b30, 0xc0a5374f, 0x1d2d00d9, 0x24147b15,
+                0xee4d111a, 0x0fca5167, 0x71ff904c, 0x2d195ffe, 0x1a05645f, 0x0c13fefe, 0x081b08ca, 0x05170121,
+                0x80530100, 0xe83e5efe, 0xac9af4f8, 0x7fe72701, 0xd2b8ee5f, 0x06df4261, 0xbb9e9b8a, 0x7293ea25,
+                0xce84ffdf, 0xf5718801, 0x3dd64b04, 0xa26f263b, 0x7ed48400, 0x547eebe6, 0x446d4ca0, 0x6cf3d6f5,
+                0x2649abdf, 0xaea0c7f5, 0x36338cc1, 0x503f7e93, 0xd3772061, 0x11b638e1, 0x72500e03, 0xf80eb2bb,
+                0xabe0502e, 0xec8d77de, 0x57971e81, 0xe14f6746, 0xc9335400, 0x6920318f, 0x081dbb99, 0xffc304a5,
+                0x4d351805, 0x7f3d5ce3, 0xa6c866c6, 0x5d5bcca9, 0xdaec6fea, 0x9f926f91, 0x9f46222f, 0x3991467d,
+                0xa5bf6d8e, 0x1143c44f, 0x43958302, 0xd0214eeb, 0x022083b8, 0x3fb6180c, 0x18f8931e, 0x281658e6,
+                0x26486e3e, 0x8bd78a70, 0x7477e4c1, 0xb506e07c, 0xf32d0a25, 0x79098b02, 0xe4eabb81, 0x28123b23,
+                0x69dead38, 0x1574ca16, 0xdf871b62, 0x211c40b7, 0xa51a9ef9, 0x0014377b, 0x041e8ac8, 0x09114003,
+                0xbd59e4d2, 0xe3d156d5, 0x4fe876d5, 0x2f91a340, 0x557be8de, 0x00eae4a7, 0x0ce5c2ec, 0x4db4bba6,
+                0xe756bdff, 0xdd3369ac, 0xec17b035, 0x06572327, 0x99afc8b0, 0x56c8c391, 0x6b65811c, 0x5e146119,
+                0x6e85cb75, 0xbe07c002, 0xc2325577, 0x893ff4ec, 0x5bbfc92d, 0xd0ec3b25, 0xb7801ab7, 0x8d6d3b24,
+                0x20c763ef, 0xc366a5fc, 0x9c382880, 0x0ace3205, 0xaac9548a, 0xeca1d7c7, 0x041afa32, 0x1d16625a,
+                0x6701902c, 0x9b757a54, 0x31d477f7, 0x9126b031, 0x36cc6fdb, 0xc70b8b46, 0xd9e66a48, 0x56e55a79,
+                0x026a4ceb, 0x52437eff, 0x2f8f76b4, 0x0df980a5, 0x8674cde3, 0xedda04eb, 0x17a9be04, 0x2c18f4df,
+                0xb7747f9d, 0xab2af7b4, 0xefc34d20, 0x2e096b7c, 0x1741a254, 0xe5b6a035, 0x213d42f6, 0x2c1c7c26,
+                0x61c2f50f, 0x6552daf9, 0xd2c231f8, 0x25130f69, 0xd8167fa2, 0x0418f2c8, 0x001a96a6, 0x0d1526ab,
+                0x63315c21, 0x5e0a72ec, 0x49bafefd, 0x187908d9, 0x8d0dbd86, 0x311170a7, 0x3e9b640c, 0xcc3e10d7,
+                0xd5cad3b6, 0x0caec388, 0xf73001e1, 0x6c728aff, 0x71eae2a1, 0x1f9af36e, 0xcfcbd12f, 0xc1de8417,
+                0xac07be6b, 0xcb44a1d8, 0x8b9b0f56, 0x013988c3, 0xb1c52fca, 0xb4be31cd, 0xd8782806, 0x12a3a4e2,
+                0x6f7de532, 0x58fd7eb6, 0xd01ee900, 0x24adffc2, 0xf4990fc5, 0x9711aac5, 0x001d7b95, 0x82e5e7d2,
+                0x109873f6, 0x00613096, 0xc32d9521, 0xada121ff, 0x29908415, 0x7fbb977f, 0xaf9eb3db, 0x29c9ed2a,
+                0x5ce2a465, 0xa730f32c, 0xd0aa3fe8, 0x8a5cc091, 0xd49e2ce7, 0x0ce454a9, 0xd60acd86, 0x015f1919,
+                0x77079103, 0xdea03af6, 0x78a8565e, 0xdee356df, 0x21f05cbe, 0x8b75e387, 0xb3c50651, 0xb8a5c3ef,
+                0xd8eeb6d2, 0xe523be77, 0xc2154529, 0x2f69efdf, 0xafe67afb, 0xf470c4b2, 0xf3e0eb5b, 0xd6cc9876,
+                0x39e4460c, 0x1fda8538, 0x1987832f, 0xca007367, 0xa99144f8, 0x296b299e, 0x492fc295, 0x9266beab,
+                0xb5676e69, 0x9bd3ddda, 0xdf7e052f, 0xdb25701c, 0x1b5e51ee, 0xf65324e6, 0x6afce36c, 0x0316cc04,
+                0x8644213e, 0xb7dc59d0, 0x7965291f, 0xccd6fd43, 0x41823979, 0x932bcdf6, 0xb657c34d, 0x4edfd282,
+                0x7ae5290c, 0x3cb9536b, 0x851e20fe, 0x9833557e, 0x13ecf0b0, 0xd3ffb372, 0x3f85c5c1, 0x0aef7ed2,
+        },
+        {
+                0x7ec90c04, 0x2c6e74b9, 0x9b0e66df, 0xa6337911, 0xb86a7fff, 0x1dd358f5, 0x44dd9d44, 0x1731167f,
+                0x08fbf1fa, 0xe7f511cc, 0xd2051b00, 0x735aba00, 0x2ab722d8, 0x386381cb, 0xacf6243a, 0x69befd7a,
+                0xe6a2e77f, 0xf0c720cd, 0xc4494816, 0xccf5c180, 0x38851640, 0x15b0a848, 0xe68b18cb, 0x4caadeff,
+                0x5f480a01, 0x0412b2aa, 0x259814fc, 0x41d0efe2, 0x4e40b48d, 0x248eb6fb, 0x8dba1cfe, 0x41a99b02,
+                0x1a550a04, 0xba8f65cb, 0x7251f4e7, 0x95a51725, 0xc106ecd7, 0x97a5980a, 0xc539b9aa, 0x4d79fe6a,
+                0xf2f3f763, 0x68af8040, 0xed0c9e56, 0x11b4958b, 0xe1eb5a88, 0x8709e6b0, 0xd7e07156, 0x4e29fea7,
+                0x6366e52d, 0x02d1c000, 0xc4ac8e05, 0x9377f571, 0x0c05372a, 0x578535f2, 0x2261be02, 0xd642a0c9,
+                0xdf13a280, 0x74b55bd2, 0x682199c0, 0xd421e5ec, 0x53fb3ce8, 0xc8adedb3, 0x28a87fc9, 0x3d959981,
+                0x5c1ff900, 0xfe38d399, 0x0c4eff0b, 0x062407ea, 0xaa2f4fb1, 0x4fb96976, 0x90c79505, 0xb0a8a774,
+                0xef55a1ff, 0xe59ca2c2, 0xa6b62d27, 0xe66a4263, 0xdf65001f, 0x0ec50966, 0xdfdd55bc, 0x29de0655,
+                0x911e739a, 0x17af8975, 0x32c7911c, 0x89f89468, 0x0d01e980, 0x524755f4, 0x03b63cc9, 0x0cc844b2,
+                0xbcf3f0aa, 0x87ac36e9, 0xe53a7426, 0x01b3d82b, 0x1a9e7449, 0x64ee2d7e, 0xcddbb1da, 0x01c94910,
+                0xb868bf80, 0x0d26f3fd, 0x9342ede7, 0x04a5c284, 0x636737b6, 0x50f5b616, 0xf24766e3, 0x8eca36c1,
+                0x136e05db, 0xfef18391, 0xfb887a37, 0xd6e7f7d4, 0xc7fb7dc9, 0x3063fcdf, 0xb6f589de, 0xec2941da,
+                0x26e46695, 0xb7566419, 0xf654efc5, 0xd08d58b7, 0x48925401, 0xc1bacb7f, 0xe5ff550f, 0xb6083049,
+                0x5bb5d0e8, 0x87d72e5a, 0xab6a6ee1, 0x223a66ce, 0xc62bf3cd, 0x9e0885f9, 0x68cb3e47, 0x086c010f,
+                0xa21de820, 0xd18b69de, 0xf3f65777, 0xfa02c3f6, 0x407edac3, 0xcbb3d550, 0x1793084d, 0xb0d70eba,
+                0x0ab378d5, 0xd951fb0c, 0xded7da56, 0x4124bbe4, 0x94ca0b56, 0x0f5755d1, 0xe0e1e56e, 0x6184b5be,
+                0x580a249f, 0x94f74bc0, 0xe327888e, 0x9f7b5561, 0xc3dc0280, 0x05687715, 0x646c6bd7, 0x44904db3,
+                0x66b4f0a3, 0xc0f1648a, 0x697ed5af, 0x49e92ff6, 0x309e374f, 0x2cb6356a, 0x85808573, 0x4991f840,
+                0x76f0ae02, 0x083be84d, 0x28421c9a, 0x44489406, 0x736e4cb8, 0xc1092910, 0x8bc95fc6, 0x7d869cf4,
+                0x134f616f, 0x2e77118d, 0xb31b2be1, 0xaa90b472, 0x3ca5d717, 0x7d161bba, 0x9cad9010, 0xaf462ba2,
+                0x9fe459d2, 0x45d34559, 0xd9f2da13, 0xdbc65487, 0xf3e4f94e, 0x176d486f, 0x097c13ea, 0x631da5c7,
+                0x445f7382, 0x175683f4, 0xcdc66a97, 0x70be0288, 0xb3cdcf72, 0x6e5dd2f3, 0x20936079, 0x459b80a5,
+                0xbe60e2db, 0xa9c23101, 0xeba5315c, 0x224e42f2, 0x1c5c1572, 0xf6721b2c, 0x1ad2fff3, 0x8c25404e,
+                0x324ed72f, 0x4067b7fd, 0x0523138e, 0x5ca3bc78, 0xdc0fd66e, 0x75922283, 0x784d6b17, 0x58ebb16e,
+                0x44094f85, 0x3f481d87, 0xfcfeae7b, 0x77b5ff76, 0x8c2302bf, 0xaaf47556, 0x5f46b02a, 0x2b092801,
+                0x3d38f5f7, 0x0ca81f36, 0x52af4a8a, 0x66d5e7c0, 0xdf3b0874, 0x95055110, 0x1b5ad7a8, 0xf61ed5ad,
+                0x6cf6e479, 0x20758184, 0xd0cefa65, 0x88f7be58, 0x4a046826, 0x0ff6f8f3, 0xa09c7f70, 0x5346aba0,
+                0x5ce96c28, 0xe176eda3, 0x6bac307f, 0x376829d2, 0x85360fa9, 0x17e3fe2a, 0x24b79767, 0xf5a96b20,
+                0xd6cd2595, 0x68ff1ebf, 0x7555442c, 0xf19f06be, 0xf9e0659a, 0xeeb9491d, 0x34010718, 0xbb30cab8,
+                0xe822fe15, 0x88570983, 0x750e6249, 0xda627e55, 0x5e76ffa8, 0xb1534546, 0x6d47de08, 0xefe9e7d4,
+        },
+        {
+                0xf6fa8f9d, 0x2cac6ce1, 0x4ca34867, 0xe2337f7c, 0x95db08e7, 0x016843b4, 0xeced5cbc, 0x325553ac,
+                0xbf9f0960, 0xdfa1e2ed, 0x83f0579d, 0x63ed86b9, 0x1ab6a6b8, 0xde5ebe39, 0xf38ff732, 0x8989b138,
+                0x33f14961, 0xc01937bd, 0xf506c6da, 0xe4625e7e, 0xa308ea99, 0x4e23e33c, 0x79cbd7cc, 0x48a14367,
+                0xa3149619, 0xfec94bd5, 0xa114174a, 0xeaa01866, 0xa084db2d, 0x09a8486f, 0xa888614a, 0x2900af98,
+                0x01665991, 0xe1992863, 0xc8f30c60, 0x2e78ef3c, 0xd0d51932, 0xcf0fec14, 0xf7ca07d2, 0xd0a82072,
+                0xfd41197e, 0x9305a6b0, 0xe86be3da, 0x74bed3cd, 0x372da53c, 0x4c7f4448, 0xdab5d440, 0x6dba0ec3,
+                0x083919a7, 0x9fbaeed9, 0x49dbcfb0, 0x4e670c53, 0x5c3d9c01, 0x64bdb941, 0x2c0e636a, 0xba7dd9cd,
+                0xea6f7388, 0xe70bc762, 0x35f29adb, 0x5c4cdd8d, 0xf0d48d8c, 0xb88153e2, 0x08a19866, 0x1ae2eac8,
+                0x284caf89, 0xaa928223, 0x9334be53, 0x3b3a21bf, 0x16434be3, 0x9aea3906, 0xefe8c36e, 0xf890cdd9,
+                0x80226dae, 0xc340a4a3, 0xdf7e9c09, 0xa694a807, 0x5b7c5ecc, 0x221db3a6, 0x9a69a02f, 0x68818a54,
+                0xceb2296f, 0x53c0843a, 0xfe893655, 0x25bfe68a, 0xb4628abc, 0xcf222ebf, 0x25ac6f48, 0xa9a99387,
+                0x53bddb65, 0xe76ffbe7, 0xe967fd78, 0x0ba93563, 0x8e342bc1, 0xe8a11be9, 0x4980740d, 0xc8087dfc,
+                0x8de4bf99, 0xa11101a0, 0x7fd37975, 0xda5a26c0, 0xe81f994f, 0x9528cd89, 0xfd339fed, 0xb87834bf,
+                0x5f04456d, 0x22258698, 0xc9c4c83b, 0x2dc156be, 0x4f628daa, 0x57f55ec5, 0xe2220abe, 0xd2916ebf,
+                0x4ec75b95, 0x24f2c3c0, 0x42d15d99, 0xcd0d7fa0, 0x7b6e27ff, 0xa8dc8af0, 0x7345c106, 0xf41e232f,
+                0x35162386, 0xe6ea8926, 0x3333b094, 0x157ec6f2, 0x372b74af, 0x692573e4, 0xe9a9d848, 0xf3160289,
+                0x3a62ef1d, 0xa787e238, 0xf3a5f676, 0x74364853, 0x20951063, 0x4576698d, 0xb6fad407, 0x592af950,
+                0x36f73523, 0x4cfb6e87, 0x7da4cec0, 0x6c152daa, 0xcb0396a8, 0xc50dfe5d, 0xfcd707ab, 0x0921c42f,
+                0x89dff0bb, 0x5fe2be78, 0x448f4f33, 0x754613c9, 0x2b05d08d, 0x48b9d585, 0xdc049441, 0xc8098f9b,
+                0x7dede786, 0xc39a3373, 0x42410005, 0x6a091751, 0x0ef3c8a6, 0x890072d6, 0x28207682, 0xa9a9f7be,
+                0xbf32679d, 0xd45b5b75, 0xb353fd00, 0xcbb0e358, 0x830f220a, 0x1f8fb214, 0xd372cf08, 0xcc3c4a13,
+                0x8cf63166, 0x061c87be, 0x88c98f88, 0x6062e397, 0x47cf8e7a, 0xb6c85283, 0x3cc2acfb, 0x3fc06976,
+                0x4e8f0252, 0x64d8314d, 0xda3870e3, 0x1e665459, 0xc10908f0, 0x513021a5, 0x6c5b68b7, 0x822f8aa0,
+                0x3007cd3e, 0x74719eef, 0xdc872681, 0x073340d4, 0x7e432fd9, 0x0c5ec241, 0x8809286c, 0xf592d891,
+                0x08a930f6, 0x957ef305, 0xb7fbffbd, 0xc266e96f, 0x6fe4ac98, 0xb173ecc0, 0xbc60b42a, 0x953498da,
+                0xfba1ae12, 0x2d4bd736, 0x0f25faab, 0xa4f3fceb, 0xe2969123, 0x257f0c3d, 0x9348af49, 0x361400bc,
+                0xe8816f4a, 0x3814f200, 0xa3f94043, 0x9c7a54c2, 0xbc704f57, 0xda41e7f9, 0xc25ad33a, 0x54f4a084,
+                0xb17f5505, 0x59357cbe, 0xedbd15c8, 0x7f97c5ab, 0xba5ac7b5, 0xb6f6deaf, 0x3a479c3a, 0x5302da25,
+                0x653d7e6a, 0x54268d49, 0x51a477ea, 0x5017d55b, 0xd7d25d88, 0x44136c76, 0x0404a8c8, 0xb8e5a121,
+                0xb81a928a, 0x60ed5869, 0x97c55b96, 0xeaec991b, 0x29935913, 0x01fdb7f1, 0x088e8dfa, 0x9ab6f6f5,
+                0x3b4cbf9f, 0x4a5de3ab, 0xe6051d35, 0xa0e1d855, 0xd36b4cf1, 0xf544edeb, 0xb0e93524, 0xbebb8fbd,
+                0xa2d762cf, 0x49c92f54, 0x38b5f331, 0x7128a454, 0x48392905, 0xa65b1db8, 0x851c97bd, 0xd675cf2f,
+        },
+        {
+                0x85e04019, 0x332bf567, 0x662dbfff, 0xcfc65693, 0x2a8d7f6f, 0xab9bc912, 0xde6008a1, 0x2028da1f,
+                0x0227bce7, 0x4d642916, 0x18fac300, 0x50f18b82, 0x2cb2cb11, 0xb232e75c, 0x4b3695f2, 0xb28707de,
+                0xa05fbcf6, 0xcd4181e9, 0xe150210c, 0xe24ef1bd, 0xb168c381, 0xfde4e789, 0x5c79b0d8, 0x1e8bfd43,
+                0x4d495001, 0x38be4341, 0x913cee1d, 0x92a79c3f, 0x089766be, 0xbaeeadf4, 0x1286becf, 0xb6eacb19,
+                0x2660c200, 0x7565bde4, 0x64241f7a, 0x8248dca9, 0xc3b3ad66, 0x28136086, 0x0bd8dfa8, 0x356d1cf2,
+                0x107789be, 0xb3b2e9ce, 0x0502aa8f, 0x0bc0351e, 0x166bf52a, 0xeb12ff82, 0xe3486911, 0xd34d7516,
+                0x4e7b3aff, 0x5f43671b, 0x9cf6e037, 0x4981ac83, 0x334266ce, 0x8c9341b7, 0xd0d854c0, 0xcb3a6c88,
+                0x47bc2829, 0x4725ba37, 0xa66ad22b, 0x7ad61f1e, 0x0c5cbafa, 0x4437f107, 0xb6e79962, 0x42d2d816,
+                0x0a961288, 0xe1a5c06e, 0x13749e67, 0x72fc081a, 0xb1d139f7, 0xf9583745, 0xcf19df58, 0xbec3f756,
+                0xc06eba30, 0x07211b24, 0x45c28829, 0xc95e317f, 0xbc8ec511, 0x38bc46e9, 0xc6e6fa14, 0xbae8584a,
+                0xad4ebc46, 0x468f508b, 0x7829435f, 0xf124183b, 0x821dba9f, 0xaff60ff4, 0xea2c4e6d, 0x16e39264,
+                0x92544a8b, 0x009b4fc3, 0xaba68ced, 0x9ac96f78, 0x06a5b79a, 0xb2856e6e, 0x1aec3ca9, 0xbe838688,
+                0x0e0804e9, 0x55f1be56, 0xe7e5363b, 0xb3a1f25d, 0xf7debb85, 0x61fe033c, 0x16746233, 0x3c034c28,
+                0xda6d0c74, 0x79aac56c, 0x3ce4e1ad, 0x51f0c802, 0x98f8f35a, 0x1626a49f, 0xeed82b29, 0x1d382fe3,
+                0x0c4fb99a, 0xbb325778, 0x3ec6d97b, 0x6e77a6a9, 0xcb658b5c, 0xd45230c7, 0x2bd1408b, 0x60c03eb7,
+                0xb9068d78, 0xa33754f4, 0xf430c87d, 0xc8a71302, 0xb96d8c32, 0xebd4e7be, 0xbe8b9d2d, 0x7979fb06,
+                0xe7225308, 0x8b75cf77, 0x11ef8da4, 0xe083c858, 0x8d6b786f, 0x5a6317a6, 0xfa5cf7a0, 0x5dda0033,
+                0xf28ebfb0, 0xf5b9c310, 0xa0eac280, 0x08b9767a, 0xa3d9d2b0, 0x79d34217, 0x021a718d, 0x9ac6336a,
+                0x2711fd60, 0x438050e3, 0x069908a8, 0x3d7fedc4, 0x826d2bef, 0x4eeb8476, 0x488dcf25, 0x36c9d566,
+                0x28e74e41, 0xc2610aca, 0x3d49a9cf, 0xbae3b9df, 0xb65f8de6, 0x92aeaf64, 0x3ac7d5e6, 0x9ea80509,
+                0xf22b017d, 0xa4173f70, 0xdd1e16c3, 0x15e0d7f9, 0x50b1b887, 0x2b9f4fd5, 0x625aba82, 0x6a017962,
+                0x2ec01b9c, 0x15488aa9, 0xd716e740, 0x40055a2c, 0x93d29a22, 0xe32dbf9a, 0x058745b9, 0x3453dc1e,
+                0xd699296e, 0x496cff6f, 0x1c9f4986, 0xdfe2ed07, 0xb87242d1, 0x19de7eae, 0x053e561a, 0x15ad6f8c,
+                0x66626c1c, 0x7154c24c, 0xea082b2a, 0x93eb2939, 0x17dcb0f0, 0x58d4f2ae, 0x9ea294fb, 0x52cf564c,
+                0x9883fe66, 0x2ec40581, 0x763953c3, 0x01d6692e, 0xd3a0c108, 0xa1e7160e, 0xe4f2dfa6, 0x693ed285,
+                0x74904698, 0x4c2b0edd, 0x4f757656, 0x5d393378, 0xa132234f, 0x3d321c5d, 0xc3f5e194, 0x4b269301,
+                0xc79f022f, 0x3c997e7e, 0x5e4f9504, 0x3ffafbbd, 0x76f7ad0e, 0x296693f4, 0x3d1fce6f, 0xc61e45be,
+                0xd3b5ab34, 0xf72bf9b7, 0x1b0434c0, 0x4e72b567, 0x5592a33d, 0xb5229301, 0xcfd2a87f, 0x60aeb767,
+                0x1814386b, 0x30bcc33d, 0x38a0c07d, 0xfd1606f2, 0xc363519b, 0x589dd390, 0x5479f8e6, 0x1cb8d647,
+                0x97fd61a9, 0xea7759f4, 0x2d57539d, 0x569a58cf, 0xe84e63ad, 0x462e1b78, 0x6580f87e, 0xf3817914,
+                0x91da55f4, 0x40a230f3, 0xd1988f35, 0xb6e318d2, 0x3ffa50bc, 0x3d40f021, 0xc3c0bdae, 0x4958c24c,
+                0x518f36b2, 0x84b1d370, 0x0fedce83, 0x878ddada, 0xf2a279c7, 0x94e01be8, 0x90716f4b, 0x954b8aa3,
+        },
+        {
+                0xe216300d, 0xbbddfffc, 0xa7ebdabd, 0x35648095, 0x7789f8b7, 0xe6c1121b, 0x0e241600, 0x052ce8b5,
+                0x11a9cfb0, 0xe5952f11, 0xece7990a, 0x9386d174, 0x2a42931c, 0x76e38111, 0xb12def3a, 0x37ddddfc,
+                0xde9adeb1, 0x0a0cc32c, 0xbe197029, 0x84a00940, 0xbb243a0f, 0xb4d137cf, 0xb44e79f0, 0x049eedfd,
+                0x0b15a15d, 0x480d3168, 0x8bbbde5a, 0x669ded42, 0xc7ece831, 0x3f8f95e7, 0x72df191b, 0x7580330d,
+                0x94074251, 0x5c7dcdfa, 0xabbe6d63, 0xaa402164, 0xb301d40a, 0x02e7d1ca, 0x53571dae, 0x7a3182a2,
+                0x12a8ddec, 0xfdaa335d, 0x176f43e8, 0x71fb46d4, 0x38129022, 0xce949ad4, 0xb84769ad, 0x965bd862,
+                0x82f3d055, 0x66fb9767, 0x15b80b4e, 0x1d5b47a0, 0x4cfde06f, 0xc28ec4b8, 0x57e8726e, 0x647a78fc,
+                0x99865d44, 0x608bd593, 0x6c200e03, 0x39dc5ff6, 0x5d0b00a3, 0xae63aff2, 0x7e8bd632, 0x70108c0c,
+                0xbbd35049, 0x2998df04, 0x980cf42a, 0x9b6df491, 0x9e7edd53, 0x06918548, 0x58cb7e07, 0x3b74ef2e,
+                0x522fffb1, 0xd24708cc, 0x1c7e27cd, 0xa4eb215b, 0x3cf1d2e2, 0x19b47a38, 0x424f7618, 0x35856039,
+                0x9d17dee7, 0x27eb35e6, 0xc9aff67b, 0x36baf5b8, 0x09c467cd, 0xc18910b1, 0xe11dbf7b, 0x06cd1af8,
+                0x7170c608, 0x2d5e3354, 0xd4de495a, 0x64c6d006, 0xbcc0c62c, 0x3dd00db3, 0x708f8f34, 0x77d51b42,
+                0x264f620f, 0x24b8d2bf, 0x15c1b79e, 0x46a52564, 0xf8d7e54e, 0x3e378160, 0x7895cda5, 0x859c15a5,
+                0xe6459788, 0xc37bc75f, 0xdb07ba0c, 0x0676a3ab, 0x7f229b1e, 0x31842e7b, 0x24259fd7, 0xf8bef472,
+                0x835ffcb8, 0x6df4c1f2, 0x96f5b195, 0xfd0af0fc, 0xb0fe134c, 0xe2506d3d, 0x4f9b12ea, 0xf215f225,
+                0xa223736f, 0x9fb4c428, 0x25d04979, 0x34c713f8, 0xc4618187, 0xea7a6e98, 0x7cd16efc, 0x1436876c,
+                0xf1544107, 0xbedeee14, 0x56e9af27, 0xa04aa441, 0x3cf7c899, 0x92ecbae6, 0xdd67016d, 0x151682eb,
+                0xa842eedf, 0xfdba60b4, 0xf1907b75, 0x20e3030f, 0x24d8c29e, 0xe139673b, 0xefa63fb8, 0x71873054,
+                0xb6f2cf3b, 0x9f326442, 0xcb15a4cc, 0xb01a4504, 0xf1e47d8d, 0x844a1be5, 0xbae7dfdc, 0x42cbda70,
+                0xcd7dae0a, 0x57e85b7a, 0xd53f5af6, 0x20cf4d8c, 0xcea4d428, 0x79d130a4, 0x3486ebfb, 0x33d3cddc,
+                0x77853b53, 0x37effcb5, 0xc5068778, 0xe580b3e6, 0x4e68b8f4, 0xc5c8b37e, 0x0d809ea2, 0x398feb7c,
+                0x132a4f94, 0x43b7950e, 0x2fee7d1c, 0x223613bd, 0xdd06caa2, 0x37df932b, 0xc4248289, 0xacf3ebc3,
+                0x5715f6b7, 0xef3478dd, 0xf267616f, 0xc148cbe4, 0x9052815e, 0x5e410fab, 0xb48a2465, 0x2eda7fa4,
+                0xe87b40e4, 0xe98ea084, 0x5889e9e1, 0xefd390fc, 0xdd07d35b, 0xdb485694, 0x38d7e5b2, 0x57720101,
+                0x730edebc, 0x5b643113, 0x94917e4f, 0x503c2fba, 0x646f1282, 0x7523d24a, 0xe0779695, 0xf9c17a8f,
+                0x7a5b2121, 0xd187b896, 0x29263a4d, 0xba510cdf, 0x81f47c9f, 0xad1163ed, 0xea7b5965, 0x1a00726e,
+                0x11403092, 0x00da6d77, 0x4a0cdd61, 0xad1f4603, 0x605bdfb0, 0x9eedc364, 0x22ebe6a8, 0xcee7d28a,
+                0xa0e736a0, 0x5564a6b9, 0x10853209, 0xc7eb8f37, 0x2de705ca, 0x8951570f, 0xdf09822b, 0xbd691a6c,
+                0xaa12e4f2, 0x87451c0f, 0xe0f6a27a, 0x3ada4819, 0x4cf1764f, 0x0d771c2b, 0x67cdb156, 0x350d8384,
+                0x5938fa0f, 0x42399ef3, 0x36997b07, 0x0e84093d, 0x4aa93e61, 0x8360d87b, 0x1fa98b0c, 0x1149382c,
+                0xe97625a5, 0x0614d1b7, 0x0e25244b, 0x0c768347, 0x589e8d82, 0x0d2059d1, 0xa466bb1e, 0xf8da0a82,
+                0x04f19130, 0xba6e4ec0, 0x99265164, 0x1ee7230d, 0x50b2ad80, 0xeaee6801, 0x8db2a283, 0xea8bf59e,
+        },
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/armor/armor.go b/vendor/golang.org/x/crypto/openpgp/armor/armor.go
new file mode 100644
index 0000000..592d186
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/armor/armor.go
@@ -0,0 +1,219 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package armor implements OpenPGP ASCII Armor, see RFC 4880. OpenPGP Armor is
+// very similar to PEM except that it has an additional CRC checksum.
+package armor // import "golang.org/x/crypto/openpgp/armor"
+
+import (
+        "bufio"
+        "bytes"
+        "encoding/base64"
+        "golang.org/x/crypto/openpgp/errors"
+        "io"
+)
+
+// A Block represents an OpenPGP armored structure.
+//
+// The encoded form is:
+//    -----BEGIN Type-----
+//    Headers
+//
+//    base64-encoded Bytes
+//    '=' base64 encoded checksum
+//    -----END Type-----
+// where Headers is a possibly empty sequence of Key: Value lines.
+//
+// Since the armored data can be very large, this package presents a streaming
+// interface.
+type Block struct {
+        Type    string            // The type, taken from the preamble (i.e. "PGP SIGNATURE").
+        Header  map[string]string // Optional headers.
+        Body    io.Reader         // A Reader from which the contents can be read
+        lReader lineReader
+        oReader openpgpReader
+}
+
+var ArmorCorrupt error = errors.StructuralError("armor invalid")
+
+const crc24Init = 0xb704ce
+const crc24Poly = 0x1864cfb
+const crc24Mask = 0xffffff
+
+// crc24 calculates the OpenPGP checksum as specified in RFC 4880, section 6.1
+func crc24(crc uint32, d []byte) uint32 {
+        for _, b := range d {
+                crc ^= uint32(b) << 16
+                for i := 0; i < 8; i++ {
+                        crc <<= 1
+                        if crc&0x1000000 != 0 {
+                                crc ^= crc24Poly
+                        }
+                }
+        }
+        return crc
+}
+
+var armorStart = []byte("-----BEGIN ")
+var armorEnd = []byte("-----END ")
+var armorEndOfLine = []byte("-----")
+
+// lineReader wraps a line based reader. It watches for the end of an armor
+// block and records the expected CRC value.
+type lineReader struct {
+        in  *bufio.Reader
+        buf []byte
+        eof bool
+        crc uint32
+}
+
+func (l *lineReader) Read(p []byte) (n int, err error) {
+        if l.eof {
+                return 0, io.EOF
+        }
+
+        if len(l.buf) > 0 {
+                n = copy(p, l.buf)
+                l.buf = l.buf[n:]
+                return
+        }
+
+        line, isPrefix, err := l.in.ReadLine()
+        if err != nil {
+                return
+        }
+        if isPrefix {
+                return 0, ArmorCorrupt
+        }
+
+        if len(line) == 5 && line[0] == '=' {
+                // This is the checksum line
+                var expectedBytes [3]byte
+                var m int
+                m, err = base64.StdEncoding.Decode(expectedBytes[0:], line[1:])
+                if m != 3 || err != nil {
+                        return
+                }
+                l.crc = uint32(expectedBytes[0])<<16 |
+                        uint32(expectedBytes[1])<<8 |
+                        uint32(expectedBytes[2])
+
+                line, _, err = l.in.ReadLine()
+                if err != nil && err != io.EOF {
+                        return
+                }
+                if !bytes.HasPrefix(line, armorEnd) {
+                        return 0, ArmorCorrupt
+                }
+
+                l.eof = true
+                return 0, io.EOF
+        }
+
+        if len(line) > 96 {
+                return 0, ArmorCorrupt
+        }
+
+        n = copy(p, line)
+        bytesToSave := len(line) - n
+        if bytesToSave > 0 {
+                if cap(l.buf) < bytesToSave {
+                        l.buf = make([]byte, 0, bytesToSave)
+                }
+                l.buf = l.buf[0:bytesToSave]
+                copy(l.buf, line[n:])
+        }
+
+        return
+}
+
+// openpgpReader passes Read calls to the underlying base64 decoder, but keeps
+// a running CRC of the resulting data and checks the CRC against the value
+// found by the lineReader at EOF.
+type openpgpReader struct {
+        lReader    *lineReader
+        b64Reader  io.Reader
+        currentCRC uint32
+}
+
+func (r *openpgpReader) Read(p []byte) (n int, err error) {
+        n, err = r.b64Reader.Read(p)
+        r.currentCRC = crc24(r.currentCRC, p[:n])
+
+        if err == io.EOF {
+                if r.lReader.crc != uint32(r.currentCRC&crc24Mask) {
+                        return 0, ArmorCorrupt
+                }
+        }
+
+        return
+}
+
+// Decode reads a PGP armored block from the given Reader. It will ignore
+// leading garbage. If it doesn't find a block, it will return nil, io.EOF. The
+// given Reader is not usable after calling this function: an arbitrary amount
+// of data may have been read past the end of the block.
+func Decode(in io.Reader) (p *Block, err error) {
+        r := bufio.NewReaderSize(in, 100)
+        var line []byte
+        ignoreNext := false
+
+TryNextBlock:
+        p = nil
+
+        // Skip leading garbage
+        for {
+                ignoreThis := ignoreNext
+                line, ignoreNext, err = r.ReadLine()
+                if err != nil {
+                        return
+                }
+                if ignoreNext || ignoreThis {
+                        continue
+                }
+                line = bytes.TrimSpace(line)
+                if len(line) > len(armorStart)+len(armorEndOfLine) && bytes.HasPrefix(line, armorStart) {
+                        break
+                }
+        }
+
+        p = new(Block)
+        p.Type = string(line[len(armorStart) : len(line)-len(armorEndOfLine)])
+        p.Header = make(map[string]string)
+        nextIsContinuation := false
+        var lastKey string
+
+        // Read headers
+        for {
+                isContinuation := nextIsContinuation
+                line, nextIsContinuation, err = r.ReadLine()
+                if err != nil {
+                        p = nil
+                        return
+                }
+                if isContinuation {
+                        p.Header[lastKey] += string(line)
+                        continue
+                }
+                line = bytes.TrimSpace(line)
+                if len(line) == 0 {
+                        break
+                }
+
+                i := bytes.Index(line, []byte(": "))
+                if i == -1 {
+                        goto TryNextBlock
+                }
+                lastKey = string(line[:i])
+                p.Header[lastKey] = string(line[i+2:])
+        }
+
+        p.lReader.in = r
+        p.oReader.currentCRC = crc24Init
+        p.oReader.lReader = &p.lReader
+        p.oReader.b64Reader = base64.NewDecoder(base64.StdEncoding, &p.lReader)
+        p.Body = &p.oReader
+
+        return
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/armor/encode.go b/vendor/golang.org/x/crypto/openpgp/armor/encode.go
new file mode 100644
index 0000000..6f07582
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/armor/encode.go
@@ -0,0 +1,160 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package armor
+
+import (
+        "encoding/base64"
+        "io"
+)
+
+var armorHeaderSep = []byte(": ")
+var blockEnd = []byte("\n=")
+var newline = []byte("\n")
+var armorEndOfLineOut = []byte("-----\n")
+
+// writeSlices writes its arguments to the given Writer.
+func writeSlices(out io.Writer, slices ...[]byte) (err error) {
+        for _, s := range slices {
+                _, err = out.Write(s)
+                if err != nil {
+                        return err
+                }
+        }
+        return
+}
+
+// lineBreaker breaks data across several lines, all of the same byte length
+// (except possibly the last). Lines are broken with a single '\n'.
+type lineBreaker struct {
+        lineLength  int
+        line        []byte
+        used        int
+        out         io.Writer
+        haveWritten bool
+}
+
+func newLineBreaker(out io.Writer, lineLength int) *lineBreaker {
+        return &lineBreaker{
+                lineLength: lineLength,
+                line:       make([]byte, lineLength),
+                used:       0,
+                out:        out,
+        }
+}
+
+func (l *lineBreaker) Write(b []byte) (n int, err error) {
+        n = len(b)
+
+        if n == 0 {
+                return
+        }
+
+        if l.used == 0 && l.haveWritten {
+                _, err = l.out.Write([]byte{'\n'})
+                if err != nil {
+                        return
+                }
+        }
+
+        if l.used+len(b) < l.lineLength {
+                l.used += copy(l.line[l.used:], b)
+                return
+        }
+
+        l.haveWritten = true
+        _, err = l.out.Write(l.line[0:l.used])
+        if err != nil {
+                return
+        }
+        excess := l.lineLength - l.used
+        l.used = 0
+
+        _, err = l.out.Write(b[0:excess])
+        if err != nil {
+                return
+        }
+
+        _, err = l.Write(b[excess:])
+        return
+}
+
+func (l *lineBreaker) Close() (err error) {
+        if l.used > 0 {
+                _, err = l.out.Write(l.line[0:l.used])
+                if err != nil {
+                        return
+                }
+        }
+
+        return
+}
+
+// encoding keeps track of a running CRC24 over the data which has been written
+// to it and outputs a OpenPGP checksum when closed, followed by an armor
+// trailer.
+//
+// It's built into a stack of io.Writers:
+//    encoding -> base64 encoder -> lineBreaker -> out
+type encoding struct {
+        out       io.Writer
+        breaker   *lineBreaker
+        b64       io.WriteCloser
+        crc       uint32
+        blockType []byte
+}
+
+func (e *encoding) Write(data []byte) (n int, err error) {
+        e.crc = crc24(e.crc, data)
+        return e.b64.Write(data)
+}
+
+func (e *encoding) Close() (err error) {
+        err = e.b64.Close()
+        if err != nil {
+                return
+        }
+        e.breaker.Close()
+
+        var checksumBytes [3]byte
+        checksumBytes[0] = byte(e.crc >> 16)
+        checksumBytes[1] = byte(e.crc >> 8)
+        checksumBytes[2] = byte(e.crc)
+
+        var b64ChecksumBytes [4]byte
+        base64.StdEncoding.Encode(b64ChecksumBytes[:], checksumBytes[:])
+
+        return writeSlices(e.out, blockEnd, b64ChecksumBytes[:], newline, armorEnd, e.blockType, armorEndOfLine)
+}
+
+// Encode returns a WriteCloser which will encode the data written to it in
+// OpenPGP armor.
+func Encode(out io.Writer, blockType string, headers map[string]string) (w io.WriteCloser, err error) {
+        bType := []byte(blockType)
+        err = writeSlices(out, armorStart, bType, armorEndOfLineOut)
+        if err != nil {
+                return
+        }
+
+        for k, v := range headers {
+                err = writeSlices(out, []byte(k), armorHeaderSep, []byte(v), newline)
+                if err != nil {
+                        return
+                }
+        }
+
+        _, err = out.Write(newline)
+        if err != nil {
+                return
+        }
+
+        e := &encoding{
+                out:       out,
+                breaker:   newLineBreaker(out, 64),
+                crc:       crc24Init,
+                blockType: bType,
+        }
+        e.b64 = base64.NewEncoder(base64.StdEncoding, e.breaker)
+        return e, nil
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/canonical_text.go b/vendor/golang.org/x/crypto/openpgp/canonical_text.go
new file mode 100644
index 0000000..e601e38
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/canonical_text.go
@@ -0,0 +1,59 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package openpgp
+
+import "hash"
+
+// NewCanonicalTextHash reformats text written to it into the canonical
+// form and then applies the hash h.  See RFC 4880, section 5.2.1.
+func NewCanonicalTextHash(h hash.Hash) hash.Hash {
+        return &canonicalTextHash{h, 0}
+}
+
+type canonicalTextHash struct {
+        h hash.Hash
+        s int
+}
+
+var newline = []byte{'\r', '\n'}
+
+func (cth *canonicalTextHash) Write(buf []byte) (int, error) {
+        start := 0
+
+        for i, c := range buf {
+                switch cth.s {
+                case 0:
+                        if c == '\r' {
+                                cth.s = 1
+                        } else if c == '\n' {
+                                cth.h.Write(buf[start:i])
+                                cth.h.Write(newline)
+                                start = i + 1
+                        }
+                case 1:
+                        cth.s = 0
+                }
+        }
+
+        cth.h.Write(buf[start:])
+        return len(buf), nil
+}
+
+func (cth *canonicalTextHash) Sum(in []byte) []byte {
+        return cth.h.Sum(in)
+}
+
+func (cth *canonicalTextHash) Reset() {
+        cth.h.Reset()
+        cth.s = 0
+}
+
+func (cth *canonicalTextHash) Size() int {
+        return cth.h.Size()
+}
+
+func (cth *canonicalTextHash) BlockSize() int {
+        return cth.h.BlockSize()
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/elgamal/elgamal.go b/vendor/golang.org/x/crypto/openpgp/elgamal/elgamal.go
new file mode 100644
index 0000000..73f4fe3
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/elgamal/elgamal.go
@@ -0,0 +1,122 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package elgamal implements ElGamal encryption, suitable for OpenPGP,
+// as specified in "A Public-Key Cryptosystem and a Signature Scheme Based on
+// Discrete Logarithms," IEEE Transactions on Information Theory, v. IT-31,
+// n. 4, 1985, pp. 469-472.
+//
+// This form of ElGamal embeds PKCS#1 v1.5 padding, which may make it
+// unsuitable for other protocols. RSA should be used in preference in any
+// case.
+package elgamal // import "golang.org/x/crypto/openpgp/elgamal"
+
+import (
+        "crypto/rand"
+        "crypto/subtle"
+        "errors"
+        "io"
+        "math/big"
+)
+
+// PublicKey represents an ElGamal public key.
+type PublicKey struct {
+        G, P, Y *big.Int
+}
+
+// PrivateKey represents an ElGamal private key.
+type PrivateKey struct {
+        PublicKey
+        X *big.Int
+}
+
+// Encrypt encrypts the given message to the given public key. The result is a
+// pair of integers. Errors can result from reading random, or because msg is
+// too large to be encrypted to the public key.
+func Encrypt(random io.Reader, pub *PublicKey, msg []byte) (c1, c2 *big.Int, err error) {
+        pLen := (pub.P.BitLen() + 7) / 8
+        if len(msg) > pLen-11 {
+                err = errors.New("elgamal: message too long")
+                return
+        }
+
+        // EM = 0x02 || PS || 0x00 || M
+        em := make([]byte, pLen-1)
+        em[0] = 2
+        ps, mm := em[1:len(em)-len(msg)-1], em[len(em)-len(msg):]
+        err = nonZeroRandomBytes(ps, random)
+        if err != nil {
+                return
+        }
+        em[len(em)-len(msg)-1] = 0
+        copy(mm, msg)
+
+        m := new(big.Int).SetBytes(em)
+
+        k, err := rand.Int(random, pub.P)
+        if err != nil {
+                return
+        }
+
+        c1 = new(big.Int).Exp(pub.G, k, pub.P)
+        s := new(big.Int).Exp(pub.Y, k, pub.P)
+        c2 = s.Mul(s, m)
+        c2.Mod(c2, pub.P)
+
+        return
+}
+
+// Decrypt takes two integers, resulting from an ElGamal encryption, and
+// returns the plaintext of the message. An error can result only if the
+// ciphertext is invalid. Users should keep in mind that this is a padding
+// oracle and thus, if exposed to an adaptive chosen ciphertext attack, can
+// be used to break the cryptosystem.  See ``Chosen Ciphertext Attacks
+// Against Protocols Based on the RSA Encryption Standard PKCS #1'', Daniel
+// Bleichenbacher, Advances in Cryptology (Crypto '98),
+func Decrypt(priv *PrivateKey, c1, c2 *big.Int) (msg []byte, err error) {
+        s := new(big.Int).Exp(c1, priv.X, priv.P)
+        s.ModInverse(s, priv.P)
+        s.Mul(s, c2)
+        s.Mod(s, priv.P)
+        em := s.Bytes()
+
+        firstByteIsTwo := subtle.ConstantTimeByteEq(em[0], 2)
+
+        // The remainder of the plaintext must be a string of non-zero random
+        // octets, followed by a 0, followed by the message.
+        //   lookingForIndex: 1 iff we are still looking for the zero.
+        //   index: the offset of the first zero byte.
+        var lookingForIndex, index int
+        lookingForIndex = 1
+
+        for i := 1; i < len(em); i++ {
+                equals0 := subtle.ConstantTimeByteEq(em[i], 0)
+                index = subtle.ConstantTimeSelect(lookingForIndex&equals0, i, index)
+                lookingForIndex = subtle.ConstantTimeSelect(equals0, 0, lookingForIndex)
+        }
+
+        if firstByteIsTwo != 1 || lookingForIndex != 0 || index < 9 {
+                return nil, errors.New("elgamal: decryption error")
+        }
+        return em[index+1:], nil
+}
+
+// nonZeroRandomBytes fills the given slice with non-zero random octets.
+func nonZeroRandomBytes(s []byte, rand io.Reader) (err error) {
+        _, err = io.ReadFull(rand, s)
+        if err != nil {
+                return
+        }
+
+        for i := 0; i < len(s); i++ {
+                for s[i] == 0 {
+                        _, err = io.ReadFull(rand, s[i:i+1])
+                        if err != nil {
+                                return
+                        }
+                }
+        }
+
+        return
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/errors/errors.go b/vendor/golang.org/x/crypto/openpgp/errors/errors.go
new file mode 100644
index 0000000..eb0550b
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/errors/errors.go
@@ -0,0 +1,72 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package errors contains common error types for the OpenPGP packages.
+package errors // import "golang.org/x/crypto/openpgp/errors"
+
+import (
+        "strconv"
+)
+
+// A StructuralError is returned when OpenPGP data is found to be syntactically
+// invalid.
+type StructuralError string
+
+func (s StructuralError) Error() string {
+        return "openpgp: invalid data: " + string(s)
+}
+
+// UnsupportedError indicates that, although the OpenPGP data is valid, it
+// makes use of currently unimplemented features.
+type UnsupportedError string
+
+func (s UnsupportedError) Error() string {
+        return "openpgp: unsupported feature: " + string(s)
+}
+
+// InvalidArgumentError indicates that the caller is in error and passed an
+// incorrect value.
+type InvalidArgumentError string
+
+func (i InvalidArgumentError) Error() string {
+        return "openpgp: invalid argument: " + string(i)
+}
+
+// SignatureError indicates that a syntactically valid signature failed to
+// validate.
+type SignatureError string
+
+func (b SignatureError) Error() string {
+        return "openpgp: invalid signature: " + string(b)
+}
+
+type keyIncorrectError int
+
+func (ki keyIncorrectError) Error() string {
+        return "openpgp: incorrect key"
+}
+
+var ErrKeyIncorrect error = keyIncorrectError(0)
+
+type unknownIssuerError int
+
+func (unknownIssuerError) Error() string {
+        return "openpgp: signature made by unknown entity"
+}
+
+var ErrUnknownIssuer error = unknownIssuerError(0)
+
+type keyRevokedError int
+
+func (keyRevokedError) Error() string {
+        return "openpgp: signature made by revoked key"
+}
+
+var ErrKeyRevoked error = keyRevokedError(0)
+
+type UnknownPacketTypeError uint8
+
+func (upte UnknownPacketTypeError) Error() string {
+        return "openpgp: unknown packet type: " + strconv.Itoa(int(upte))
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/keys.go b/vendor/golang.org/x/crypto/openpgp/keys.go
new file mode 100644
index 0000000..68b14c6
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/keys.go
@@ -0,0 +1,637 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package openpgp
+
+import (
+        "crypto/rsa"
+        "io"
+        "time"
+
+        "golang.org/x/crypto/openpgp/armor"
+        "golang.org/x/crypto/openpgp/errors"
+        "golang.org/x/crypto/openpgp/packet"
+)
+
+// PublicKeyType is the armor type for a PGP public key.
+var PublicKeyType = "PGP PUBLIC KEY BLOCK"
+
+// PrivateKeyType is the armor type for a PGP private key.
+var PrivateKeyType = "PGP PRIVATE KEY BLOCK"
+
+// An Entity represents the components of an OpenPGP key: a primary public key
+// (which must be a signing key), one or more identities claimed by that key,
+// and zero or more subkeys, which may be encryption keys.
+type Entity struct {
+        PrimaryKey  *packet.PublicKey
+        PrivateKey  *packet.PrivateKey
+        Identities  map[string]*Identity // indexed by Identity.Name
+        Revocations []*packet.Signature
+        Subkeys     []Subkey
+}
+
+// An Identity represents an identity claimed by an Entity and zero or more
+// assertions by other entities about that claim.
+type Identity struct {
+        Name          string // by convention, has the form "Full Name (comment) <email@example.com>"
+        UserId        *packet.UserId
+        SelfSignature *packet.Signature
+        Signatures    []*packet.Signature
+}
+
+// A Subkey is an additional public key in an Entity. Subkeys can be used for
+// encryption.
+type Subkey struct {
+        PublicKey  *packet.PublicKey
+        PrivateKey *packet.PrivateKey
+        Sig        *packet.Signature
+}
+
+// A Key identifies a specific public key in an Entity. This is either the
+// Entity's primary key or a subkey.
+type Key struct {
+        Entity        *Entity
+        PublicKey     *packet.PublicKey
+        PrivateKey    *packet.PrivateKey
+        SelfSignature *packet.Signature
+}
+
+// A KeyRing provides access to public and private keys.
+type KeyRing interface {
+        // KeysById returns the set of keys that have the given key id.
+        KeysById(id uint64) []Key
+        // KeysByIdAndUsage returns the set of keys with the given id
+        // that also meet the key usage given by requiredUsage.
+        // The requiredUsage is expressed as the bitwise-OR of
+        // packet.KeyFlag* values.
+        KeysByIdUsage(id uint64, requiredUsage byte) []Key
+        // DecryptionKeys returns all private keys that are valid for
+        // decryption.
+        DecryptionKeys() []Key
+}
+
+// primaryIdentity returns the Identity marked as primary or the first identity
+// if none are so marked.
+func (e *Entity) primaryIdentity() *Identity {
+        var firstIdentity *Identity
+        for _, ident := range e.Identities {
+                if firstIdentity == nil {
+                        firstIdentity = ident
+                }
+                if ident.SelfSignature.IsPrimaryId != nil && *ident.SelfSignature.IsPrimaryId {
+                        return ident
+                }
+        }
+        return firstIdentity
+}
+
+// encryptionKey returns the best candidate Key for encrypting a message to the
+// given Entity.
+func (e *Entity) encryptionKey(now time.Time) (Key, bool) {
+        candidateSubkey := -1
+
+        // Iterate the keys to find the newest key
+        var maxTime time.Time
+        for i, subkey := range e.Subkeys {
+                if subkey.Sig.FlagsValid &&
+                        subkey.Sig.FlagEncryptCommunications &&
+                        subkey.PublicKey.PubKeyAlgo.CanEncrypt() &&
+                        !subkey.Sig.KeyExpired(now) &&
+                        (maxTime.IsZero() || subkey.Sig.CreationTime.After(maxTime)) {
+                        candidateSubkey = i
+                        maxTime = subkey.Sig.CreationTime
+                }
+        }
+
+        if candidateSubkey != -1 {
+                subkey := e.Subkeys[candidateSubkey]
+                return Key{e, subkey.PublicKey, subkey.PrivateKey, subkey.Sig}, true
+        }
+
+        // If we don't have any candidate subkeys for encryption and
+        // the primary key doesn't have any usage metadata then we
+        // assume that the primary key is ok. Or, if the primary key is
+        // marked as ok to encrypt to, then we can obviously use it.
+        i := e.primaryIdentity()
+        if !i.SelfSignature.FlagsValid || i.SelfSignature.FlagEncryptCommunications &&
+                e.PrimaryKey.PubKeyAlgo.CanEncrypt() &&
+                !i.SelfSignature.KeyExpired(now) {
+                return Key{e, e.PrimaryKey, e.PrivateKey, i.SelfSignature}, true
+        }
+
+        // This Entity appears to be signing only.
+        return Key{}, false
+}
+
+// signingKey return the best candidate Key for signing a message with this
+// Entity.
+func (e *Entity) signingKey(now time.Time) (Key, bool) {
+        candidateSubkey := -1
+
+        for i, subkey := range e.Subkeys {
+                if subkey.Sig.FlagsValid &&
+                        subkey.Sig.FlagSign &&
+                        subkey.PublicKey.PubKeyAlgo.CanSign() &&
+                        !subkey.Sig.KeyExpired(now) {
+                        candidateSubkey = i
+                        break
+                }
+        }
+
+        if candidateSubkey != -1 {
+                subkey := e.Subkeys[candidateSubkey]
+                return Key{e, subkey.PublicKey, subkey.PrivateKey, subkey.Sig}, true
+        }
+
+        // If we have no candidate subkey then we assume that it's ok to sign
+        // with the primary key.
+        i := e.primaryIdentity()
+        if !i.SelfSignature.FlagsValid || i.SelfSignature.FlagSign &&
+                !i.SelfSignature.KeyExpired(now) {
+                return Key{e, e.PrimaryKey, e.PrivateKey, i.SelfSignature}, true
+        }
+
+        return Key{}, false
+}
+
+// An EntityList contains one or more Entities.
+type EntityList []*Entity
+
+// KeysById returns the set of keys that have the given key id.
+func (el EntityList) KeysById(id uint64) (keys []Key) {
+        for _, e := range el {
+                if e.PrimaryKey.KeyId == id {
+                        var selfSig *packet.Signature
+                        for _, ident := range e.Identities {
+                                if selfSig == nil {
+                                        selfSig = ident.SelfSignature
+                                } else if ident.SelfSignature.IsPrimaryId != nil && *ident.SelfSignature.IsPrimaryId {
+                                        selfSig = ident.SelfSignature
+                                        break
+                                }
+                        }
+                        keys = append(keys, Key{e, e.PrimaryKey, e.PrivateKey, selfSig})
+                }
+
+                for _, subKey := range e.Subkeys {
+                        if subKey.PublicKey.KeyId == id {
+                                keys = append(keys, Key{e, subKey.PublicKey, subKey.PrivateKey, subKey.Sig})
+                        }
+                }
+        }
+        return
+}
+
+// KeysByIdAndUsage returns the set of keys with the given id that also meet
+// the key usage given by requiredUsage.  The requiredUsage is expressed as
+// the bitwise-OR of packet.KeyFlag* values.
+func (el EntityList) KeysByIdUsage(id uint64, requiredUsage byte) (keys []Key) {
+        for _, key := range el.KeysById(id) {
+                if len(key.Entity.Revocations) > 0 {
+                        continue
+                }
+
+                if key.SelfSignature.RevocationReason != nil {
+                        continue
+                }
+
+                if key.SelfSignature.FlagsValid && requiredUsage != 0 {
+                        var usage byte
+                        if key.SelfSignature.FlagCertify {
+                                usage |= packet.KeyFlagCertify
+                        }
+                        if key.SelfSignature.FlagSign {
+                                usage |= packet.KeyFlagSign
+                        }
+                        if key.SelfSignature.FlagEncryptCommunications {
+                                usage |= packet.KeyFlagEncryptCommunications
+                        }
+                        if key.SelfSignature.FlagEncryptStorage {
+                                usage |= packet.KeyFlagEncryptStorage
+                        }
+                        if usage&requiredUsage != requiredUsage {
+                                continue
+                        }
+                }
+
+                keys = append(keys, key)
+        }
+        return
+}
+
+// DecryptionKeys returns all private keys that are valid for decryption.
+func (el EntityList) DecryptionKeys() (keys []Key) {
+        for _, e := range el {
+                for _, subKey := range e.Subkeys {
+                        if subKey.PrivateKey != nil && (!subKey.Sig.FlagsValid || subKey.Sig.FlagEncryptStorage || subKey.Sig.FlagEncryptCommunications) {
+                                keys = append(keys, Key{e, subKey.PublicKey, subKey.PrivateKey, subKey.Sig})
+                        }
+                }
+        }
+        return
+}
+
+// ReadArmoredKeyRing reads one or more public/private keys from an armor keyring file.
+func ReadArmoredKeyRing(r io.Reader) (EntityList, error) {
+        block, err := armor.Decode(r)
+        if err == io.EOF {
+                return nil, errors.InvalidArgumentError("no armored data found")
+        }
+        if err != nil {
+                return nil, err
+        }
+        if block.Type != PublicKeyType && block.Type != PrivateKeyType {
+                return nil, errors.InvalidArgumentError("expected public or private key block, got: " + block.Type)
+        }
+
+        return ReadKeyRing(block.Body)
+}
+
+// ReadKeyRing reads one or more public/private keys. Unsupported keys are
+// ignored as long as at least a single valid key is found.
+func ReadKeyRing(r io.Reader) (el EntityList, err error) {
+        packets := packet.NewReader(r)
+        var lastUnsupportedError error
+
+        for {
+                var e *Entity
+                e, err = ReadEntity(packets)
+                if err != nil {
+                        // TODO: warn about skipped unsupported/unreadable keys
+                        if _, ok := err.(errors.UnsupportedError); ok {
+                                lastUnsupportedError = err
+                                err = readToNextPublicKey(packets)
+                        } else if _, ok := err.(errors.StructuralError); ok {
+                                // Skip unreadable, badly-formatted keys
+                                lastUnsupportedError = err
+                                err = readToNextPublicKey(packets)
+                        }
+                        if err == io.EOF {
+                                err = nil
+                                break
+                        }
+                        if err != nil {
+                                el = nil
+                                break
+                        }
+                } else {
+                        el = append(el, e)
+                }
+        }
+
+        if len(el) == 0 && err == nil {
+                err = lastUnsupportedError
+        }
+        return
+}
+
+// readToNextPublicKey reads packets until the start of the entity and leaves
+// the first packet of the new entity in the Reader.
+func readToNextPublicKey(packets *packet.Reader) (err error) {
+        var p packet.Packet
+        for {
+                p, err = packets.Next()
+                if err == io.EOF {
+                        return
+                } else if err != nil {
+                        if _, ok := err.(errors.UnsupportedError); ok {
+                                err = nil
+                                continue
+                        }
+                        return
+                }
+
+                if pk, ok := p.(*packet.PublicKey); ok && !pk.IsSubkey {
+                        packets.Unread(p)
+                        return
+                }
+        }
+}
+
+// ReadEntity reads an entity (public key, identities, subkeys etc) from the
+// given Reader.
+func ReadEntity(packets *packet.Reader) (*Entity, error) {
+        e := new(Entity)
+        e.Identities = make(map[string]*Identity)
+
+        p, err := packets.Next()
+        if err != nil {
+                return nil, err
+        }
+
+        var ok bool
+        if e.PrimaryKey, ok = p.(*packet.PublicKey); !ok {
+                if e.PrivateKey, ok = p.(*packet.PrivateKey); !ok {
+                        packets.Unread(p)
+                        return nil, errors.StructuralError("first packet was not a public/private key")
+                } else {
+                        e.PrimaryKey = &e.PrivateKey.PublicKey
+                }
+        }
+
+        if !e.PrimaryKey.PubKeyAlgo.CanSign() {
+                return nil, errors.StructuralError("primary key cannot be used for signatures")
+        }
+
+        var current *Identity
+        var revocations []*packet.Signature
+EachPacket:
+        for {
+                p, err := packets.Next()
+                if err == io.EOF {
+                        break
+                } else if err != nil {
+                        return nil, err
+                }
+
+                switch pkt := p.(type) {
+                case *packet.UserId:
+                        current = new(Identity)
+                        current.Name = pkt.Id
+                        current.UserId = pkt
+                        e.Identities[pkt.Id] = current
+
+                        for {
+                                p, err = packets.Next()
+                                if err == io.EOF {
+                                        return nil, io.ErrUnexpectedEOF
+                                } else if err != nil {
+                                        return nil, err
+                                }
+
+                                sig, ok := p.(*packet.Signature)
+                                if !ok {
+                                        return nil, errors.StructuralError("user ID packet not followed by self-signature")
+                                }
+
+                                if (sig.SigType == packet.SigTypePositiveCert || sig.SigType == packet.SigTypeGenericCert) && sig.IssuerKeyId != nil && *sig.IssuerKeyId == e.PrimaryKey.KeyId {
+                                        if err = e.PrimaryKey.VerifyUserIdSignature(pkt.Id, e.PrimaryKey, sig); err != nil {
+                                                return nil, errors.StructuralError("user ID self-signature invalid: " + err.Error())
+                                        }
+                                        current.SelfSignature = sig
+                                        break
+                                }
+                                current.Signatures = append(current.Signatures, sig)
+                        }
+                case *packet.Signature:
+                        if pkt.SigType == packet.SigTypeKeyRevocation {
+                                revocations = append(revocations, pkt)
+                        } else if pkt.SigType == packet.SigTypeDirectSignature {
+                                // TODO: RFC4880 5.2.1 permits signatures
+                                // directly on keys (eg. to bind additional
+                                // revocation keys).
+                        } else if current == nil {
+                                return nil, errors.StructuralError("signature packet found before user id packet")
+                        } else {
+                                current.Signatures = append(current.Signatures, pkt)
+                        }
+                case *packet.PrivateKey:
+                        if pkt.IsSubkey == false {
+                                packets.Unread(p)
+                                break EachPacket
+                        }
+                        err = addSubkey(e, packets, &pkt.PublicKey, pkt)
+                        if err != nil {
+                                return nil, err
+                        }
+                case *packet.PublicKey:
+                        if pkt.IsSubkey == false {
+                                packets.Unread(p)
+                                break EachPacket
+                        }
+                        err = addSubkey(e, packets, pkt, nil)
+                        if err != nil {
+                                return nil, err
+                        }
+                default:
+                        // we ignore unknown packets
+                }
+        }
+
+        if len(e.Identities) == 0 {
+                return nil, errors.StructuralError("entity without any identities")
+        }
+
+        for _, revocation := range revocations {
+                err = e.PrimaryKey.VerifyRevocationSignature(revocation)
+                if err == nil {
+                        e.Revocations = append(e.Revocations, revocation)
+                } else {
+                        // TODO: RFC 4880 5.2.3.15 defines revocation keys.
+                        return nil, errors.StructuralError("revocation signature signed by alternate key")
+                }
+        }
+
+        return e, nil
+}
+
+func addSubkey(e *Entity, packets *packet.Reader, pub *packet.PublicKey, priv *packet.PrivateKey) error {
+        var subKey Subkey
+        subKey.PublicKey = pub
+        subKey.PrivateKey = priv
+        p, err := packets.Next()
+        if err == io.EOF {
+                return io.ErrUnexpectedEOF
+        }
+        if err != nil {
+                return errors.StructuralError("subkey signature invalid: " + err.Error())
+        }
+        var ok bool
+        subKey.Sig, ok = p.(*packet.Signature)
+        if !ok {
+                return errors.StructuralError("subkey packet not followed by signature")
+        }
+        if subKey.Sig.SigType != packet.SigTypeSubkeyBinding && subKey.Sig.SigType != packet.SigTypeSubkeyRevocation {
+                return errors.StructuralError("subkey signature with wrong type")
+        }
+        err = e.PrimaryKey.VerifyKeySignature(subKey.PublicKey, subKey.Sig)
+        if err != nil {
+                return errors.StructuralError("subkey signature invalid: " + err.Error())
+        }
+        e.Subkeys = append(e.Subkeys, subKey)
+        return nil
+}
+
+const defaultRSAKeyBits = 2048
+
+// NewEntity returns an Entity that contains a fresh RSA/RSA keypair with a
+// single identity composed of the given full name, comment and email, any of
+// which may be empty but must not contain any of "()<>\x00".
+// If config is nil, sensible defaults will be used.
+func NewEntity(name, comment, email string, config *packet.Config) (*Entity, error) {
+        currentTime := config.Now()
+
+        bits := defaultRSAKeyBits
+        if config != nil && config.RSABits != 0 {
+                bits = config.RSABits
+        }
+
+        uid := packet.NewUserId(name, comment, email)
+        if uid == nil {
+                return nil, errors.InvalidArgumentError("user id field contained invalid characters")
+        }
+        signingPriv, err := rsa.GenerateKey(config.Random(), bits)
+        if err != nil {
+                return nil, err
+        }
+        encryptingPriv, err := rsa.GenerateKey(config.Random(), bits)
+        if err != nil {
+                return nil, err
+        }
+
+        e := &Entity{
+                PrimaryKey: packet.NewRSAPublicKey(currentTime, &signingPriv.PublicKey),
+                PrivateKey: packet.NewRSAPrivateKey(currentTime, signingPriv),
+                Identities: make(map[string]*Identity),
+        }
+        isPrimaryId := true
+        e.Identities[uid.Id] = &Identity{
+                Name:   uid.Name,
+                UserId: uid,
+                SelfSignature: &packet.Signature{
+                        CreationTime: currentTime,
+                        SigType:      packet.SigTypePositiveCert,
+                        PubKeyAlgo:   packet.PubKeyAlgoRSA,
+                        Hash:         config.Hash(),
+                        IsPrimaryId:  &isPrimaryId,
+                        FlagsValid:   true,
+                        FlagSign:     true,
+                        FlagCertify:  true,
+                        IssuerKeyId:  &e.PrimaryKey.KeyId,
+                },
+        }
+
+        // If the user passes in a DefaultHash via packet.Config,
+        // set the PreferredHash for the SelfSignature.
+        if config != nil && config.DefaultHash != 0 {
+                e.Identities[uid.Id].SelfSignature.PreferredHash = []uint8{hashToHashId(config.DefaultHash)}
+        }
+
+        e.Subkeys = make([]Subkey, 1)
+        e.Subkeys[0] = Subkey{
+                PublicKey:  packet.NewRSAPublicKey(currentTime, &encryptingPriv.PublicKey),
+                PrivateKey: packet.NewRSAPrivateKey(currentTime, encryptingPriv),
+                Sig: &packet.Signature{
+                        CreationTime:              currentTime,
+                        SigType:                   packet.SigTypeSubkeyBinding,
+                        PubKeyAlgo:                packet.PubKeyAlgoRSA,
+                        Hash:                      config.Hash(),
+                        FlagsValid:                true,
+                        FlagEncryptStorage:        true,
+                        FlagEncryptCommunications: true,
+                        IssuerKeyId:               &e.PrimaryKey.KeyId,
+                },
+        }
+        e.Subkeys[0].PublicKey.IsSubkey = true
+        e.Subkeys[0].PrivateKey.IsSubkey = true
+
+        return e, nil
+}
+
+// SerializePrivate serializes an Entity, including private key material, to
+// the given Writer. For now, it must only be used on an Entity returned from
+// NewEntity.
+// If config is nil, sensible defaults will be used.
+func (e *Entity) SerializePrivate(w io.Writer, config *packet.Config) (err error) {
+        err = e.PrivateKey.Serialize(w)
+        if err != nil {
+                return
+        }
+        for _, ident := range e.Identities {
+                err = ident.UserId.Serialize(w)
+                if err != nil {
+                        return
+                }
+                err = ident.SelfSignature.SignUserId(ident.UserId.Id, e.PrimaryKey, e.PrivateKey, config)
+                if err != nil {
+                        return
+                }
+                err = ident.SelfSignature.Serialize(w)
+                if err != nil {
+                        return
+                }
+        }
+        for _, subkey := range e.Subkeys {
+                err = subkey.PrivateKey.Serialize(w)
+                if err != nil {
+                        return
+                }
+                err = subkey.Sig.SignKey(subkey.PublicKey, e.PrivateKey, config)
+                if err != nil {
+                        return
+                }
+                err = subkey.Sig.Serialize(w)
+                if err != nil {
+                        return
+                }
+        }
+        return nil
+}
+
+// Serialize writes the public part of the given Entity to w. (No private
+// key material will be output).
+func (e *Entity) Serialize(w io.Writer) error {
+        err := e.PrimaryKey.Serialize(w)
+        if err != nil {
+                return err
+        }
+        for _, ident := range e.Identities {
+                err = ident.UserId.Serialize(w)
+                if err != nil {
+                        return err
+                }
+                err = ident.SelfSignature.Serialize(w)
+                if err != nil {
+                        return err
+                }
+                for _, sig := range ident.Signatures {
+                        err = sig.Serialize(w)
+                        if err != nil {
+                                return err
+                        }
+                }
+        }
+        for _, subkey := range e.Subkeys {
+                err = subkey.PublicKey.Serialize(w)
+                if err != nil {
+                        return err
+                }
+                err = subkey.Sig.Serialize(w)
+                if err != nil {
+                        return err
+                }
+        }
+        return nil
+}
+
+// SignIdentity adds a signature to e, from signer, attesting that identity is
+// associated with e. The provided identity must already be an element of
+// e.Identities and the private key of signer must have been decrypted if
+// necessary.
+// If config is nil, sensible defaults will be used.
+func (e *Entity) SignIdentity(identity string, signer *Entity, config *packet.Config) error {
+        if signer.PrivateKey == nil {
+                return errors.InvalidArgumentError("signing Entity must have a private key")
+        }
+        if signer.PrivateKey.Encrypted {
+                return errors.InvalidArgumentError("signing Entity's private key must be decrypted")
+        }
+        ident, ok := e.Identities[identity]
+        if !ok {
+                return errors.InvalidArgumentError("given identity string not found in Entity")
+        }
+
+        sig := &packet.Signature{
+                SigType:      packet.SigTypeGenericCert,
+                PubKeyAlgo:   signer.PrivateKey.PubKeyAlgo,
+                Hash:         config.Hash(),
+                CreationTime: config.Now(),
+                IssuerKeyId:  &signer.PrivateKey.KeyId,
+        }
+        if err := sig.SignUserId(identity, e.PrimaryKey, signer.PrivateKey, config); err != nil {
+                return err
+        }
+        ident.Signatures = append(ident.Signatures, sig)
+        return nil
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/packet/compressed.go b/vendor/golang.org/x/crypto/openpgp/packet/compressed.go
new file mode 100644
index 0000000..e8f0b5c
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/packet/compressed.go
@@ -0,0 +1,123 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+        "compress/bzip2"
+        "compress/flate"
+        "compress/zlib"
+        "golang.org/x/crypto/openpgp/errors"
+        "io"
+        "strconv"
+)
+
+// Compressed represents a compressed OpenPGP packet. The decompressed contents
+// will contain more OpenPGP packets. See RFC 4880, section 5.6.
+type Compressed struct {
+        Body io.Reader
+}
+
+const (
+        NoCompression      = flate.NoCompression
+        BestSpeed          = flate.BestSpeed
+        BestCompression    = flate.BestCompression
+        DefaultCompression = flate.DefaultCompression
+)
+
+// CompressionConfig contains compressor configuration settings.
+type CompressionConfig struct {
+        // Level is the compression level to use. It must be set to
+        // between -1 and 9, with -1 causing the compressor to use the
+        // default compression level, 0 causing the compressor to use
+        // no compression and 1 to 9 representing increasing (better,
+        // slower) compression levels. If Level is less than -1 or
+        // more then 9, a non-nil error will be returned during
+        // encryption. See the constants above for convenient common
+        // settings for Level.
+        Level int
+}
+
+func (c *Compressed) parse(r io.Reader) error {
+        var buf [1]byte
+        _, err := readFull(r, buf[:])
+        if err != nil {
+                return err
+        }
+
+        switch buf[0] {
+        case 1:
+                c.Body = flate.NewReader(r)
+        case 2:
+                c.Body, err = zlib.NewReader(r)
+        case 3:
+                c.Body = bzip2.NewReader(r)
+        default:
+                err = errors.UnsupportedError("unknown compression algorithm: " + strconv.Itoa(int(buf[0])))
+        }
+
+        return err
+}
+
+// compressedWriterCloser represents the serialized compression stream
+// header and the compressor. Its Close() method ensures that both the
+// compressor and serialized stream header are closed. Its Write()
+// method writes to the compressor.
+type compressedWriteCloser struct {
+        sh io.Closer      // Stream Header
+        c  io.WriteCloser // Compressor
+}
+
+func (cwc compressedWriteCloser) Write(p []byte) (int, error) {
+        return cwc.c.Write(p)
+}
+
+func (cwc compressedWriteCloser) Close() (err error) {
+        err = cwc.c.Close()
+        if err != nil {
+                return err
+        }
+
+        return cwc.sh.Close()
+}
+
+// SerializeCompressed serializes a compressed data packet to w and
+// returns a WriteCloser to which the literal data packets themselves
+// can be written and which MUST be closed on completion. If cc is
+// nil, sensible defaults will be used to configure the compression
+// algorithm.
+func SerializeCompressed(w io.WriteCloser, algo CompressionAlgo, cc *CompressionConfig) (literaldata io.WriteCloser, err error) {
+        compressed, err := serializeStreamHeader(w, packetTypeCompressed)
+        if err != nil {
+                return
+        }
+
+        _, err = compressed.Write([]byte{uint8(algo)})
+        if err != nil {
+                return
+        }
+
+        level := DefaultCompression
+        if cc != nil {
+                level = cc.Level
+        }
+
+        var compressor io.WriteCloser
+        switch algo {
+        case CompressionZIP:
+                compressor, err = flate.NewWriter(compressed, level)
+        case CompressionZLIB:
+                compressor, err = zlib.NewWriterLevel(compressed, level)
+        default:
+                s := strconv.Itoa(int(algo))
+                err = errors.UnsupportedError("Unsupported compression algorithm: " + s)
+        }
+        if err != nil {
+                return
+        }
+
+        literaldata = compressedWriteCloser{compressed, compressor}
+
+        return
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/packet/config.go b/vendor/golang.org/x/crypto/openpgp/packet/config.go
new file mode 100644
index 0000000..c76eecc
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/packet/config.go
@@ -0,0 +1,91 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+        "crypto"
+        "crypto/rand"
+        "io"
+        "time"
+)
+
+// Config collects a number of parameters along with sensible defaults.
+// A nil *Config is valid and results in all default values.
+type Config struct {
+        // Rand provides the source of entropy.
+        // If nil, the crypto/rand Reader is used.
+        Rand io.Reader
+        // DefaultHash is the default hash function to be used.
+        // If zero, SHA-256 is used.
+        DefaultHash crypto.Hash
+        // DefaultCipher is the cipher to be used.
+        // If zero, AES-128 is used.
+        DefaultCipher CipherFunction
+        // Time returns the current time as the number of seconds since the
+        // epoch. If Time is nil, time.Now is used.
+        Time func() time.Time
+        // DefaultCompressionAlgo is the compression algorithm to be
+        // applied to the plaintext before encryption. If zero, no
+        // compression is done.
+        DefaultCompressionAlgo CompressionAlgo
+        // CompressionConfig configures the compression settings.
+        CompressionConfig *CompressionConfig
+        // S2KCount is only used for symmetric encryption. It
+        // determines the strength of the passphrase stretching when
+        // the said passphrase is hashed to produce a key. S2KCount
+        // should be between 1024 and 65011712, inclusive. If Config
+        // is nil or S2KCount is 0, the value 65536 used. Not all
+        // values in the above range can be represented. S2KCount will
+        // be rounded up to the next representable value if it cannot
+        // be encoded exactly. When set, it is strongly encrouraged to
+        // use a value that is at least 65536. See RFC 4880 Section
+        // 3.7.1.3.
+        S2KCount int
+        // RSABits is the number of bits in new RSA keys made with NewEntity.
+        // If zero, then 2048 bit keys are created.
+        RSABits int
+}
+
+func (c *Config) Random() io.Reader {
+        if c == nil || c.Rand == nil {
+                return rand.Reader
+        }
+        return c.Rand
+}
+
+func (c *Config) Hash() crypto.Hash {
+        if c == nil || uint(c.DefaultHash) == 0 {
+                return crypto.SHA256
+        }
+        return c.DefaultHash
+}
+
+func (c *Config) Cipher() CipherFunction {
+        if c == nil || uint8(c.DefaultCipher) == 0 {
+                return CipherAES128
+        }
+        return c.DefaultCipher
+}
+
+func (c *Config) Now() time.Time {
+        if c == nil || c.Time == nil {
+                return time.Now()
+        }
+        return c.Time()
+}
+
+func (c *Config) Compression() CompressionAlgo {
+        if c == nil {
+                return CompressionNone
+        }
+        return c.DefaultCompressionAlgo
+}
+
+func (c *Config) PasswordHashIterations() int {
+        if c == nil || c.S2KCount == 0 {
+                return 0
+        }
+        return c.S2KCount
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/packet/encrypted_key.go b/vendor/golang.org/x/crypto/openpgp/packet/encrypted_key.go
new file mode 100644
index 0000000..266840d
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/packet/encrypted_key.go
@@ -0,0 +1,199 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+        "crypto/rsa"
+        "encoding/binary"
+        "io"
+        "math/big"
+        "strconv"
+
+        "golang.org/x/crypto/openpgp/elgamal"
+        "golang.org/x/crypto/openpgp/errors"
+)
+
+const encryptedKeyVersion = 3
+
+// EncryptedKey represents a public-key encrypted session key. See RFC 4880,
+// section 5.1.
+type EncryptedKey struct {
+        KeyId      uint64
+        Algo       PublicKeyAlgorithm
+        CipherFunc CipherFunction // only valid after a successful Decrypt
+        Key        []byte         // only valid after a successful Decrypt
+
+        encryptedMPI1, encryptedMPI2 parsedMPI
+}
+
+func (e *EncryptedKey) parse(r io.Reader) (err error) {
+        var buf [10]byte
+        _, err = readFull(r, buf[:])
+        if err != nil {
+                return
+        }
+        if buf[0] != encryptedKeyVersion {
+                return errors.UnsupportedError("unknown EncryptedKey version " + strconv.Itoa(int(buf[0])))
+        }
+        e.KeyId = binary.BigEndian.Uint64(buf[1:9])
+        e.Algo = PublicKeyAlgorithm(buf[9])
+        switch e.Algo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly:
+                e.encryptedMPI1.bytes, e.encryptedMPI1.bitLength, err = readMPI(r)
+        case PubKeyAlgoElGamal:
+                e.encryptedMPI1.bytes, e.encryptedMPI1.bitLength, err = readMPI(r)
+                if err != nil {
+                        return
+                }
+                e.encryptedMPI2.bytes, e.encryptedMPI2.bitLength, err = readMPI(r)
+        }
+        _, err = consumeAll(r)
+        return
+}
+
+func checksumKeyMaterial(key []byte) uint16 {
+        var checksum uint16
+        for _, v := range key {
+                checksum += uint16(v)
+        }
+        return checksum
+}
+
+// Decrypt decrypts an encrypted session key with the given private key. The
+// private key must have been decrypted first.
+// If config is nil, sensible defaults will be used.
+func (e *EncryptedKey) Decrypt(priv *PrivateKey, config *Config) error {
+        var err error
+        var b []byte
+
+        // TODO(agl): use session key decryption routines here to avoid
+        // padding oracle attacks.
+        switch priv.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly:
+                b, err = rsa.DecryptPKCS1v15(config.Random(), priv.PrivateKey.(*rsa.PrivateKey), e.encryptedMPI1.bytes)
+        case PubKeyAlgoElGamal:
+                c1 := new(big.Int).SetBytes(e.encryptedMPI1.bytes)
+                c2 := new(big.Int).SetBytes(e.encryptedMPI2.bytes)
+                b, err = elgamal.Decrypt(priv.PrivateKey.(*elgamal.PrivateKey), c1, c2)
+        default:
+                err = errors.InvalidArgumentError("cannot decrypted encrypted session key with private key of type " + strconv.Itoa(int(priv.PubKeyAlgo)))
+        }
+
+        if err != nil {
+                return err
+        }
+
+        e.CipherFunc = CipherFunction(b[0])
+        e.Key = b[1 : len(b)-2]
+        expectedChecksum := uint16(b[len(b)-2])<<8 | uint16(b[len(b)-1])
+        checksum := checksumKeyMaterial(e.Key)
+        if checksum != expectedChecksum {
+                return errors.StructuralError("EncryptedKey checksum incorrect")
+        }
+
+        return nil
+}
+
+// Serialize writes the encrypted key packet, e, to w.
+func (e *EncryptedKey) Serialize(w io.Writer) error {
+        var mpiLen int
+        switch e.Algo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly:
+                mpiLen = 2 + len(e.encryptedMPI1.bytes)
+        case PubKeyAlgoElGamal:
+                mpiLen = 2 + len(e.encryptedMPI1.bytes) + 2 + len(e.encryptedMPI2.bytes)
+        default:
+                return errors.InvalidArgumentError("don't know how to serialize encrypted key type " + strconv.Itoa(int(e.Algo)))
+        }
+
+        serializeHeader(w, packetTypeEncryptedKey, 1 /* version */ +8 /* key id */ +1 /* algo */ +mpiLen)
+
+        w.Write([]byte{encryptedKeyVersion})
+        binary.Write(w, binary.BigEndian, e.KeyId)
+        w.Write([]byte{byte(e.Algo)})
+
+        switch e.Algo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly:
+                writeMPIs(w, e.encryptedMPI1)
+        case PubKeyAlgoElGamal:
+                writeMPIs(w, e.encryptedMPI1, e.encryptedMPI2)
+        default:
+                panic("internal error")
+        }
+
+        return nil
+}
+
+// SerializeEncryptedKey serializes an encrypted key packet to w that contains
+// key, encrypted to pub.
+// If config is nil, sensible defaults will be used.
+func SerializeEncryptedKey(w io.Writer, pub *PublicKey, cipherFunc CipherFunction, key []byte, config *Config) error {
+        var buf [10]byte
+        buf[0] = encryptedKeyVersion
+        binary.BigEndian.PutUint64(buf[1:9], pub.KeyId)
+        buf[9] = byte(pub.PubKeyAlgo)
+
+        keyBlock := make([]byte, 1 /* cipher type */ +len(key)+2 /* checksum */)
+        keyBlock[0] = byte(cipherFunc)
+        copy(keyBlock[1:], key)
+        checksum := checksumKeyMaterial(key)
+        keyBlock[1+len(key)] = byte(checksum >> 8)
+        keyBlock[1+len(key)+1] = byte(checksum)
+
+        switch pub.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly:
+                return serializeEncryptedKeyRSA(w, config.Random(), buf, pub.PublicKey.(*rsa.PublicKey), keyBlock)
+        case PubKeyAlgoElGamal:
+                return serializeEncryptedKeyElGamal(w, config.Random(), buf, pub.PublicKey.(*elgamal.PublicKey), keyBlock)
+        case PubKeyAlgoDSA, PubKeyAlgoRSASignOnly:
+                return errors.InvalidArgumentError("cannot encrypt to public key of type " + strconv.Itoa(int(pub.PubKeyAlgo)))
+        }
+
+        return errors.UnsupportedError("encrypting a key to public key of type " + strconv.Itoa(int(pub.PubKeyAlgo)))
+}
+
+func serializeEncryptedKeyRSA(w io.Writer, rand io.Reader, header [10]byte, pub *rsa.PublicKey, keyBlock []byte) error {
+        cipherText, err := rsa.EncryptPKCS1v15(rand, pub, keyBlock)
+        if err != nil {
+                return errors.InvalidArgumentError("RSA encryption failed: " + err.Error())
+        }
+
+        packetLen := 10 /* header length */ + 2 /* mpi size */ + len(cipherText)
+
+        err = serializeHeader(w, packetTypeEncryptedKey, packetLen)
+        if err != nil {
+                return err
+        }
+        _, err = w.Write(header[:])
+        if err != nil {
+                return err
+        }
+        return writeMPI(w, 8*uint16(len(cipherText)), cipherText)
+}
+
+func serializeEncryptedKeyElGamal(w io.Writer, rand io.Reader, header [10]byte, pub *elgamal.PublicKey, keyBlock []byte) error {
+        c1, c2, err := elgamal.Encrypt(rand, pub, keyBlock)
+        if err != nil {
+                return errors.InvalidArgumentError("ElGamal encryption failed: " + err.Error())
+        }
+
+        packetLen := 10 /* header length */
+        packetLen += 2 /* mpi size */ + (c1.BitLen()+7)/8
+        packetLen += 2 /* mpi size */ + (c2.BitLen()+7)/8
+
+        err = serializeHeader(w, packetTypeEncryptedKey, packetLen)
+        if err != nil {
+                return err
+        }
+        _, err = w.Write(header[:])
+        if err != nil {
+                return err
+        }
+        err = writeBig(w, c1)
+        if err != nil {
+                return err
+        }
+        return writeBig(w, c2)
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/packet/literal.go b/vendor/golang.org/x/crypto/openpgp/packet/literal.go
new file mode 100644
index 0000000..1a9ec6e
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/packet/literal.go
@@ -0,0 +1,89 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+        "encoding/binary"
+        "io"
+)
+
+// LiteralData represents an encrypted file. See RFC 4880, section 5.9.
+type LiteralData struct {
+        IsBinary bool
+        FileName string
+        Time     uint32 // Unix epoch time. Either creation time or modification time. 0 means undefined.
+        Body     io.Reader
+}
+
+// ForEyesOnly returns whether the contents of the LiteralData have been marked
+// as especially sensitive.
+func (l *LiteralData) ForEyesOnly() bool {
+        return l.FileName == "_CONSOLE"
+}
+
+func (l *LiteralData) parse(r io.Reader) (err error) {
+        var buf [256]byte
+
+        _, err = readFull(r, buf[:2])
+        if err != nil {
+                return
+        }
+
+        l.IsBinary = buf[0] == 'b'
+        fileNameLen := int(buf[1])
+
+        _, err = readFull(r, buf[:fileNameLen])
+        if err != nil {
+                return
+        }
+
+        l.FileName = string(buf[:fileNameLen])
+
+        _, err = readFull(r, buf[:4])
+        if err != nil {
+                return
+        }
+
+        l.Time = binary.BigEndian.Uint32(buf[:4])
+        l.Body = r
+        return
+}
+
+// SerializeLiteral serializes a literal data packet to w and returns a
+// WriteCloser to which the data itself can be written and which MUST be closed
+// on completion. The fileName is truncated to 255 bytes.
+func SerializeLiteral(w io.WriteCloser, isBinary bool, fileName string, time uint32) (plaintext io.WriteCloser, err error) {
+        var buf [4]byte
+        buf[0] = 't'
+        if isBinary {
+                buf[0] = 'b'
+        }
+        if len(fileName) > 255 {
+                fileName = fileName[:255]
+        }
+        buf[1] = byte(len(fileName))
+
+        inner, err := serializeStreamHeader(w, packetTypeLiteralData)
+        if err != nil {
+                return
+        }
+
+        _, err = inner.Write(buf[:2])
+        if err != nil {
+                return
+        }
+        _, err = inner.Write([]byte(fileName))
+        if err != nil {
+                return
+        }
+        binary.BigEndian.PutUint32(buf[:], time)
+        _, err = inner.Write(buf[:])
+        if err != nil {
+                return
+        }
+
+        plaintext = inner
+        return
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/packet/ocfb.go b/vendor/golang.org/x/crypto/openpgp/packet/ocfb.go
new file mode 100644
index 0000000..ce2a33a
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/packet/ocfb.go
@@ -0,0 +1,143 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// OpenPGP CFB Mode. http://tools.ietf.org/html/rfc4880#section-13.9
+
+package packet
+
+import (
+        "crypto/cipher"
+)
+
+type ocfbEncrypter struct {
+        b       cipher.Block
+        fre     []byte
+        outUsed int
+}
+
+// An OCFBResyncOption determines if the "resynchronization step" of OCFB is
+// performed.
+type OCFBResyncOption bool
+
+const (
+        OCFBResync   OCFBResyncOption = true
+        OCFBNoResync OCFBResyncOption = false
+)
+
+// NewOCFBEncrypter returns a cipher.Stream which encrypts data with OpenPGP's
+// cipher feedback mode using the given cipher.Block, and an initial amount of
+// ciphertext.  randData must be random bytes and be the same length as the
+// cipher.Block's block size. Resync determines if the "resynchronization step"
+// from RFC 4880, 13.9 step 7 is performed. Different parts of OpenPGP vary on
+// this point.
+func NewOCFBEncrypter(block cipher.Block, randData []byte, resync OCFBResyncOption) (cipher.Stream, []byte) {
+        blockSize := block.BlockSize()
+        if len(randData) != blockSize {
+                return nil, nil
+        }
+
+        x := &ocfbEncrypter{
+                b:       block,
+                fre:     make([]byte, blockSize),
+                outUsed: 0,
+        }
+        prefix := make([]byte, blockSize+2)
+
+        block.Encrypt(x.fre, x.fre)
+        for i := 0; i < blockSize; i++ {
+                prefix[i] = randData[i] ^ x.fre[i]
+        }
+
+        block.Encrypt(x.fre, prefix[:blockSize])
+        prefix[blockSize] = x.fre[0] ^ randData[blockSize-2]
+        prefix[blockSize+1] = x.fre[1] ^ randData[blockSize-1]
+
+        if resync {
+                block.Encrypt(x.fre, prefix[2:])
+        } else {
+                x.fre[0] = prefix[blockSize]
+                x.fre[1] = prefix[blockSize+1]
+                x.outUsed = 2
+        }
+        return x, prefix
+}
+
+func (x *ocfbEncrypter) XORKeyStream(dst, src []byte) {
+        for i := 0; i < len(src); i++ {
+                if x.outUsed == len(x.fre) {
+                        x.b.Encrypt(x.fre, x.fre)
+                        x.outUsed = 0
+                }
+
+                x.fre[x.outUsed] ^= src[i]
+                dst[i] = x.fre[x.outUsed]
+                x.outUsed++
+        }
+}
+
+type ocfbDecrypter struct {
+        b       cipher.Block
+        fre     []byte
+        outUsed int
+}
+
+// NewOCFBDecrypter returns a cipher.Stream which decrypts data with OpenPGP's
+// cipher feedback mode using the given cipher.Block. Prefix must be the first
+// blockSize + 2 bytes of the ciphertext, where blockSize is the cipher.Block's
+// block size. If an incorrect key is detected then nil is returned. On
+// successful exit, blockSize+2 bytes of decrypted data are written into
+// prefix. Resync determines if the "resynchronization step" from RFC 4880,
+// 13.9 step 7 is performed. Different parts of OpenPGP vary on this point.
+func NewOCFBDecrypter(block cipher.Block, prefix []byte, resync OCFBResyncOption) cipher.Stream {
+        blockSize := block.BlockSize()
+        if len(prefix) != blockSize+2 {
+                return nil
+        }
+
+        x := &ocfbDecrypter{
+                b:       block,
+                fre:     make([]byte, blockSize),
+                outUsed: 0,
+        }
+        prefixCopy := make([]byte, len(prefix))
+        copy(prefixCopy, prefix)
+
+        block.Encrypt(x.fre, x.fre)
+        for i := 0; i < blockSize; i++ {
+                prefixCopy[i] ^= x.fre[i]
+        }
+
+        block.Encrypt(x.fre, prefix[:blockSize])
+        prefixCopy[blockSize] ^= x.fre[0]
+        prefixCopy[blockSize+1] ^= x.fre[1]
+
+        if prefixCopy[blockSize-2] != prefixCopy[blockSize] ||
+                prefixCopy[blockSize-1] != prefixCopy[blockSize+1] {
+                return nil
+        }
+
+        if resync {
+                block.Encrypt(x.fre, prefix[2:])
+        } else {
+                x.fre[0] = prefix[blockSize]
+                x.fre[1] = prefix[blockSize+1]
+                x.outUsed = 2
+        }
+        copy(prefix, prefixCopy)
+        return x
+}
+
+func (x *ocfbDecrypter) XORKeyStream(dst, src []byte) {
+        for i := 0; i < len(src); i++ {
+                if x.outUsed == len(x.fre) {
+                        x.b.Encrypt(x.fre, x.fre)
+                        x.outUsed = 0
+                }
+
+                c := src[i]
+                dst[i] = x.fre[x.outUsed] ^ src[i]
+                x.fre[x.outUsed] = c
+                x.outUsed++
+        }
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/packet/one_pass_signature.go b/vendor/golang.org/x/crypto/openpgp/packet/one_pass_signature.go
new file mode 100644
index 0000000..1713503
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/packet/one_pass_signature.go
@@ -0,0 +1,73 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+        "crypto"
+        "encoding/binary"
+        "golang.org/x/crypto/openpgp/errors"
+        "golang.org/x/crypto/openpgp/s2k"
+        "io"
+        "strconv"
+)
+
+// OnePassSignature represents a one-pass signature packet. See RFC 4880,
+// section 5.4.
+type OnePassSignature struct {
+        SigType    SignatureType
+        Hash       crypto.Hash
+        PubKeyAlgo PublicKeyAlgorithm
+        KeyId      uint64
+        IsLast     bool
+}
+
+const onePassSignatureVersion = 3
+
+func (ops *OnePassSignature) parse(r io.Reader) (err error) {
+        var buf [13]byte
+
+        _, err = readFull(r, buf[:])
+        if err != nil {
+                return
+        }
+        if buf[0] != onePassSignatureVersion {
+                err = errors.UnsupportedError("one-pass-signature packet version " + strconv.Itoa(int(buf[0])))
+        }
+
+        var ok bool
+        ops.Hash, ok = s2k.HashIdToHash(buf[2])
+        if !ok {
+                return errors.UnsupportedError("hash function: " + strconv.Itoa(int(buf[2])))
+        }
+
+        ops.SigType = SignatureType(buf[1])
+        ops.PubKeyAlgo = PublicKeyAlgorithm(buf[3])
+        ops.KeyId = binary.BigEndian.Uint64(buf[4:12])
+        ops.IsLast = buf[12] != 0
+        return
+}
+
+// Serialize marshals the given OnePassSignature to w.
+func (ops *OnePassSignature) Serialize(w io.Writer) error {
+        var buf [13]byte
+        buf[0] = onePassSignatureVersion
+        buf[1] = uint8(ops.SigType)
+        var ok bool
+        buf[2], ok = s2k.HashToHashId(ops.Hash)
+        if !ok {
+                return errors.UnsupportedError("hash type: " + strconv.Itoa(int(ops.Hash)))
+        }
+        buf[3] = uint8(ops.PubKeyAlgo)
+        binary.BigEndian.PutUint64(buf[4:12], ops.KeyId)
+        if ops.IsLast {
+                buf[12] = 1
+        }
+
+        if err := serializeHeader(w, packetTypeOnePassSignature, len(buf)); err != nil {
+                return err
+        }
+        _, err := w.Write(buf[:])
+        return err
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/packet/opaque.go b/vendor/golang.org/x/crypto/openpgp/packet/opaque.go
new file mode 100644
index 0000000..456d807
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/packet/opaque.go
@@ -0,0 +1,162 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+        "bytes"
+        "io"
+        "io/ioutil"
+
+        "golang.org/x/crypto/openpgp/errors"
+)
+
+// OpaquePacket represents an OpenPGP packet as raw, unparsed data. This is
+// useful for splitting and storing the original packet contents separately,
+// handling unsupported packet types or accessing parts of the packet not yet
+// implemented by this package.
+type OpaquePacket struct {
+        // Packet type
+        Tag uint8
+        // Reason why the packet was parsed opaquely
+        Reason error
+        // Binary contents of the packet data
+        Contents []byte
+}
+
+func (op *OpaquePacket) parse(r io.Reader) (err error) {
+        op.Contents, err = ioutil.ReadAll(r)
+        return
+}
+
+// Serialize marshals the packet to a writer in its original form, including
+// the packet header.
+func (op *OpaquePacket) Serialize(w io.Writer) (err error) {
+        err = serializeHeader(w, packetType(op.Tag), len(op.Contents))
+        if err == nil {
+                _, err = w.Write(op.Contents)
+        }
+        return
+}
+
+// Parse attempts to parse the opaque contents into a structure supported by
+// this package. If the packet is not known then the result will be another
+// OpaquePacket.
+func (op *OpaquePacket) Parse() (p Packet, err error) {
+        hdr := bytes.NewBuffer(nil)
+        err = serializeHeader(hdr, packetType(op.Tag), len(op.Contents))
+        if err != nil {
+                op.Reason = err
+                return op, err
+        }
+        p, err = Read(io.MultiReader(hdr, bytes.NewBuffer(op.Contents)))
+        if err != nil {
+                op.Reason = err
+                p = op
+        }
+        return
+}
+
+// OpaqueReader reads OpaquePackets from an io.Reader.
+type OpaqueReader struct {
+        r io.Reader
+}
+
+func NewOpaqueReader(r io.Reader) *OpaqueReader {
+        return &OpaqueReader{r: r}
+}
+
+// Read the next OpaquePacket.
+func (or *OpaqueReader) Next() (op *OpaquePacket, err error) {
+        tag, _, contents, err := readHeader(or.r)
+        if err != nil {
+                return
+        }
+        op = &OpaquePacket{Tag: uint8(tag), Reason: err}
+        err = op.parse(contents)
+        if err != nil {
+                consumeAll(contents)
+        }
+        return
+}
+
+// OpaqueSubpacket represents an unparsed OpenPGP subpacket,
+// as found in signature and user attribute packets.
+type OpaqueSubpacket struct {
+        SubType  uint8
+        Contents []byte
+}
+
+// OpaqueSubpackets extracts opaque, unparsed OpenPGP subpackets from
+// their byte representation.
+func OpaqueSubpackets(contents []byte) (result []*OpaqueSubpacket, err error) {
+        var (
+                subHeaderLen int
+                subPacket    *OpaqueSubpacket
+        )
+        for len(contents) > 0 {
+                subHeaderLen, subPacket, err = nextSubpacket(contents)
+                if err != nil {
+                        break
+                }
+                result = append(result, subPacket)
+                contents = contents[subHeaderLen+len(subPacket.Contents):]
+        }
+        return
+}
+
+func nextSubpacket(contents []byte) (subHeaderLen int, subPacket *OpaqueSubpacket, err error) {
+        // RFC 4880, section 5.2.3.1
+        var subLen uint32
+        if len(contents) < 1 {
+                goto Truncated
+        }
+        subPacket = &OpaqueSubpacket{}
+        switch {
+        case contents[0] < 192:
+                subHeaderLen = 2 // 1 length byte, 1 subtype byte
+                if len(contents) < subHeaderLen {
+                        goto Truncated
+                }
+                subLen = uint32(contents[0])
+                contents = contents[1:]
+        case contents[0] < 255:
+                subHeaderLen = 3 // 2 length bytes, 1 subtype
+                if len(contents) < subHeaderLen {
+                        goto Truncated
+                }
+                subLen = uint32(contents[0]-192)<<8 + uint32(contents[1]) + 192
+                contents = contents[2:]
+        default:
+                subHeaderLen = 6 // 5 length bytes, 1 subtype
+                if len(contents) < subHeaderLen {
+                        goto Truncated
+                }
+                subLen = uint32(contents[1])<<24 |
+                        uint32(contents[2])<<16 |
+                        uint32(contents[3])<<8 |
+                        uint32(contents[4])
+                contents = contents[5:]
+        }
+        if subLen > uint32(len(contents)) || subLen == 0 {
+                goto Truncated
+        }
+        subPacket.SubType = contents[0]
+        subPacket.Contents = contents[1:subLen]
+        return
+Truncated:
+        err = errors.StructuralError("subpacket truncated")
+        return
+}
+
+func (osp *OpaqueSubpacket) Serialize(w io.Writer) (err error) {
+        buf := make([]byte, 6)
+        n := serializeSubpacketLength(buf, len(osp.Contents)+1)
+        buf[n] = osp.SubType
+        if _, err = w.Write(buf[:n+1]); err != nil {
+                return
+        }
+        _, err = w.Write(osp.Contents)
+        return
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/packet/packet.go b/vendor/golang.org/x/crypto/openpgp/packet/packet.go
new file mode 100644
index 0000000..3eded93
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/packet/packet.go
@@ -0,0 +1,537 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package packet implements parsing and serialization of OpenPGP packets, as
+// specified in RFC 4880.
+package packet // import "golang.org/x/crypto/openpgp/packet"
+
+import (
+        "bufio"
+        "crypto/aes"
+        "crypto/cipher"
+        "crypto/des"
+        "golang.org/x/crypto/cast5"
+        "golang.org/x/crypto/openpgp/errors"
+        "io"
+        "math/big"
+)
+
+// readFull is the same as io.ReadFull except that reading zero bytes returns
+// ErrUnexpectedEOF rather than EOF.
+func readFull(r io.Reader, buf []byte) (n int, err error) {
+        n, err = io.ReadFull(r, buf)
+        if err == io.EOF {
+                err = io.ErrUnexpectedEOF
+        }
+        return
+}
+
+// readLength reads an OpenPGP length from r. See RFC 4880, section 4.2.2.
+func readLength(r io.Reader) (length int64, isPartial bool, err error) {
+        var buf [4]byte
+        _, err = readFull(r, buf[:1])
+        if err != nil {
+                return
+        }
+        switch {
+        case buf[0] < 192:
+                length = int64(buf[0])
+        case buf[0] < 224:
+                length = int64(buf[0]-192) << 8
+                _, err = readFull(r, buf[0:1])
+                if err != nil {
+                        return
+                }
+                length += int64(buf[0]) + 192
+        case buf[0] < 255:
+                length = int64(1) << (buf[0] & 0x1f)
+                isPartial = true
+        default:
+                _, err = readFull(r, buf[0:4])
+                if err != nil {
+                        return
+                }
+                length = int64(buf[0])<<24 |
+                        int64(buf[1])<<16 |
+                        int64(buf[2])<<8 |
+                        int64(buf[3])
+        }
+        return
+}
+
+// partialLengthReader wraps an io.Reader and handles OpenPGP partial lengths.
+// The continuation lengths are parsed and removed from the stream and EOF is
+// returned at the end of the packet. See RFC 4880, section 4.2.2.4.
+type partialLengthReader struct {
+        r         io.Reader
+        remaining int64
+        isPartial bool
+}
+
+func (r *partialLengthReader) Read(p []byte) (n int, err error) {
+        for r.remaining == 0 {
+                if !r.isPartial {
+                        return 0, io.EOF
+                }
+                r.remaining, r.isPartial, err = readLength(r.r)
+                if err != nil {
+                        return 0, err
+                }
+        }
+
+        toRead := int64(len(p))
+        if toRead > r.remaining {
+                toRead = r.remaining
+        }
+
+        n, err = r.r.Read(p[:int(toRead)])
+        r.remaining -= int64(n)
+        if n < int(toRead) && err == io.EOF {
+                err = io.ErrUnexpectedEOF
+        }
+        return
+}
+
+// partialLengthWriter writes a stream of data using OpenPGP partial lengths.
+// See RFC 4880, section 4.2.2.4.
+type partialLengthWriter struct {
+        w          io.WriteCloser
+        lengthByte [1]byte
+}
+
+func (w *partialLengthWriter) Write(p []byte) (n int, err error) {
+        for len(p) > 0 {
+                for power := uint(14); power < 32; power-- {
+                        l := 1 << power
+                        if len(p) >= l {
+                                w.lengthByte[0] = 224 + uint8(power)
+                                _, err = w.w.Write(w.lengthByte[:])
+                                if err != nil {
+                                        return
+                                }
+                                var m int
+                                m, err = w.w.Write(p[:l])
+                                n += m
+                                if err != nil {
+                                        return
+                                }
+                                p = p[l:]
+                                break
+                        }
+                }
+        }
+        return
+}
+
+func (w *partialLengthWriter) Close() error {
+        w.lengthByte[0] = 0
+        _, err := w.w.Write(w.lengthByte[:])
+        if err != nil {
+                return err
+        }
+        return w.w.Close()
+}
+
+// A spanReader is an io.LimitReader, but it returns ErrUnexpectedEOF if the
+// underlying Reader returns EOF before the limit has been reached.
+type spanReader struct {
+        r io.Reader
+        n int64
+}
+
+func (l *spanReader) Read(p []byte) (n int, err error) {
+        if l.n <= 0 {
+                return 0, io.EOF
+        }
+        if int64(len(p)) > l.n {
+                p = p[0:l.n]
+        }
+        n, err = l.r.Read(p)
+        l.n -= int64(n)
+        if l.n > 0 && err == io.EOF {
+                err = io.ErrUnexpectedEOF
+        }
+        return
+}
+
+// readHeader parses a packet header and returns an io.Reader which will return
+// the contents of the packet. See RFC 4880, section 4.2.
+func readHeader(r io.Reader) (tag packetType, length int64, contents io.Reader, err error) {
+        var buf [4]byte
+        _, err = io.ReadFull(r, buf[:1])
+        if err != nil {
+                return
+        }
+        if buf[0]&0x80 == 0 {
+                err = errors.StructuralError("tag byte does not have MSB set")
+                return
+        }
+        if buf[0]&0x40 == 0 {
+                // Old format packet
+                tag = packetType((buf[0] & 0x3f) >> 2)
+                lengthType := buf[0] & 3
+                if lengthType == 3 {
+                        length = -1
+                        contents = r
+                        return
+                }
+                lengthBytes := 1 << lengthType
+                _, err = readFull(r, buf[0:lengthBytes])
+                if err != nil {
+                        return
+                }
+                for i := 0; i < lengthBytes; i++ {
+                        length <<= 8
+                        length |= int64(buf[i])
+                }
+                contents = &spanReader{r, length}
+                return
+        }
+
+        // New format packet
+        tag = packetType(buf[0] & 0x3f)
+        length, isPartial, err := readLength(r)
+        if err != nil {
+                return
+        }
+        if isPartial {
+                contents = &partialLengthReader{
+                        remaining: length,
+                        isPartial: true,
+                        r:         r,
+                }
+                length = -1
+        } else {
+                contents = &spanReader{r, length}
+        }
+        return
+}
+
+// serializeHeader writes an OpenPGP packet header to w. See RFC 4880, section
+// 4.2.
+func serializeHeader(w io.Writer, ptype packetType, length int) (err error) {
+        var buf [6]byte
+        var n int
+
+        buf[0] = 0x80 | 0x40 | byte(ptype)
+        if length < 192 {
+                buf[1] = byte(length)
+                n = 2
+        } else if length < 8384 {
+                length -= 192
+                buf[1] = 192 + byte(length>>8)
+                buf[2] = byte(length)
+                n = 3
+        } else {
+                buf[1] = 255
+                buf[2] = byte(length >> 24)
+                buf[3] = byte(length >> 16)
+                buf[4] = byte(length >> 8)
+                buf[5] = byte(length)
+                n = 6
+        }
+
+        _, err = w.Write(buf[:n])
+        return
+}
+
+// serializeStreamHeader writes an OpenPGP packet header to w where the
+// length of the packet is unknown. It returns a io.WriteCloser which can be
+// used to write the contents of the packet. See RFC 4880, section 4.2.
+func serializeStreamHeader(w io.WriteCloser, ptype packetType) (out io.WriteCloser, err error) {
+        var buf [1]byte
+        buf[0] = 0x80 | 0x40 | byte(ptype)
+        _, err = w.Write(buf[:])
+        if err != nil {
+                return
+        }
+        out = &partialLengthWriter{w: w}
+        return
+}
+
+// Packet represents an OpenPGP packet. Users are expected to try casting
+// instances of this interface to specific packet types.
+type Packet interface {
+        parse(io.Reader) error
+}
+
+// consumeAll reads from the given Reader until error, returning the number of
+// bytes read.
+func consumeAll(r io.Reader) (n int64, err error) {
+        var m int
+        var buf [1024]byte
+
+        for {
+                m, err = r.Read(buf[:])
+                n += int64(m)
+                if err == io.EOF {
+                        err = nil
+                        return
+                }
+                if err != nil {
+                        return
+                }
+        }
+}
+
+// packetType represents the numeric ids of the different OpenPGP packet types. See
+// http://www.iana.org/assignments/pgp-parameters/pgp-parameters.xhtml#pgp-parameters-2
+type packetType uint8
+
+const (
+        packetTypeEncryptedKey              packetType = 1
+        packetTypeSignature                 packetType = 2
+        packetTypeSymmetricKeyEncrypted     packetType = 3
+        packetTypeOnePassSignature          packetType = 4
+        packetTypePrivateKey                packetType = 5
+        packetTypePublicKey                 packetType = 6
+        packetTypePrivateSubkey             packetType = 7
+        packetTypeCompressed                packetType = 8
+        packetTypeSymmetricallyEncrypted    packetType = 9
+        packetTypeLiteralData               packetType = 11
+        packetTypeUserId                    packetType = 13
+        packetTypePublicSubkey              packetType = 14
+        packetTypeUserAttribute             packetType = 17
+        packetTypeSymmetricallyEncryptedMDC packetType = 18
+)
+
+// peekVersion detects the version of a public key packet about to
+// be read. A bufio.Reader at the original position of the io.Reader
+// is returned.
+func peekVersion(r io.Reader) (bufr *bufio.Reader, ver byte, err error) {
+        bufr = bufio.NewReader(r)
+        var verBuf []byte
+        if verBuf, err = bufr.Peek(1); err != nil {
+                return
+        }
+        ver = verBuf[0]
+        return
+}
+
+// Read reads a single OpenPGP packet from the given io.Reader. If there is an
+// error parsing a packet, the whole packet is consumed from the input.
+func Read(r io.Reader) (p Packet, err error) {
+        tag, _, contents, err := readHeader(r)
+        if err != nil {
+                return
+        }
+
+        switch tag {
+        case packetTypeEncryptedKey:
+                p = new(EncryptedKey)
+        case packetTypeSignature:
+                var version byte
+                // Detect signature version
+                if contents, version, err = peekVersion(contents); err != nil {
+                        return
+                }
+                if version < 4 {
+                        p = new(SignatureV3)
+                } else {
+                        p = new(Signature)
+                }
+        case packetTypeSymmetricKeyEncrypted:
+                p = new(SymmetricKeyEncrypted)
+        case packetTypeOnePassSignature:
+                p = new(OnePassSignature)
+        case packetTypePrivateKey, packetTypePrivateSubkey:
+                pk := new(PrivateKey)
+                if tag == packetTypePrivateSubkey {
+                        pk.IsSubkey = true
+                }
+                p = pk
+        case packetTypePublicKey, packetTypePublicSubkey:
+                var version byte
+                if contents, version, err = peekVersion(contents); err != nil {
+                        return
+                }
+                isSubkey := tag == packetTypePublicSubkey
+                if version < 4 {
+                        p = &PublicKeyV3{IsSubkey: isSubkey}
+                } else {
+                        p = &PublicKey{IsSubkey: isSubkey}
+                }
+        case packetTypeCompressed:
+                p = new(Compressed)
+        case packetTypeSymmetricallyEncrypted:
+                p = new(SymmetricallyEncrypted)
+        case packetTypeLiteralData:
+                p = new(LiteralData)
+        case packetTypeUserId:
+                p = new(UserId)
+        case packetTypeUserAttribute:
+                p = new(UserAttribute)
+        case packetTypeSymmetricallyEncryptedMDC:
+                se := new(SymmetricallyEncrypted)
+                se.MDC = true
+                p = se
+        default:
+                err = errors.UnknownPacketTypeError(tag)
+        }
+        if p != nil {
+                err = p.parse(contents)
+        }
+        if err != nil {
+                consumeAll(contents)
+        }
+        return
+}
+
+// SignatureType represents the different semantic meanings of an OpenPGP
+// signature. See RFC 4880, section 5.2.1.
+type SignatureType uint8
+
+const (
+        SigTypeBinary            SignatureType = 0
+        SigTypeText                            = 1
+        SigTypeGenericCert                     = 0x10
+        SigTypePersonaCert                     = 0x11
+        SigTypeCasualCert                      = 0x12
+        SigTypePositiveCert                    = 0x13
+        SigTypeSubkeyBinding                   = 0x18
+        SigTypePrimaryKeyBinding               = 0x19
+        SigTypeDirectSignature                 = 0x1F
+        SigTypeKeyRevocation                   = 0x20
+        SigTypeSubkeyRevocation                = 0x28
+)
+
+// PublicKeyAlgorithm represents the different public key system specified for
+// OpenPGP. See
+// http://www.iana.org/assignments/pgp-parameters/pgp-parameters.xhtml#pgp-parameters-12
+type PublicKeyAlgorithm uint8
+
+const (
+        PubKeyAlgoRSA            PublicKeyAlgorithm = 1
+        PubKeyAlgoRSAEncryptOnly PublicKeyAlgorithm = 2
+        PubKeyAlgoRSASignOnly    PublicKeyAlgorithm = 3
+        PubKeyAlgoElGamal        PublicKeyAlgorithm = 16
+        PubKeyAlgoDSA            PublicKeyAlgorithm = 17
+        // RFC 6637, Section 5.
+        PubKeyAlgoECDH  PublicKeyAlgorithm = 18
+        PubKeyAlgoECDSA PublicKeyAlgorithm = 19
+)
+
+// CanEncrypt returns true if it's possible to encrypt a message to a public
+// key of the given type.
+func (pka PublicKeyAlgorithm) CanEncrypt() bool {
+        switch pka {
+        case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoElGamal:
+                return true
+        }
+        return false
+}
+
+// CanSign returns true if it's possible for a public key of the given type to
+// sign a message.
+func (pka PublicKeyAlgorithm) CanSign() bool {
+        switch pka {
+        case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly, PubKeyAlgoDSA, PubKeyAlgoECDSA:
+                return true
+        }
+        return false
+}
+
+// CipherFunction represents the different block ciphers specified for OpenPGP. See
+// http://www.iana.org/assignments/pgp-parameters/pgp-parameters.xhtml#pgp-parameters-13
+type CipherFunction uint8
+
+const (
+        Cipher3DES   CipherFunction = 2
+        CipherCAST5  CipherFunction = 3
+        CipherAES128 CipherFunction = 7
+        CipherAES192 CipherFunction = 8
+        CipherAES256 CipherFunction = 9
+)
+
+// KeySize returns the key size, in bytes, of cipher.
+func (cipher CipherFunction) KeySize() int {
+        switch cipher {
+        case Cipher3DES:
+                return 24
+        case CipherCAST5:
+                return cast5.KeySize
+        case CipherAES128:
+                return 16
+        case CipherAES192:
+                return 24
+        case CipherAES256:
+                return 32
+        }
+        return 0
+}
+
+// blockSize returns the block size, in bytes, of cipher.
+func (cipher CipherFunction) blockSize() int {
+        switch cipher {
+        case Cipher3DES:
+                return des.BlockSize
+        case CipherCAST5:
+                return 8
+        case CipherAES128, CipherAES192, CipherAES256:
+                return 16
+        }
+        return 0
+}
+
+// new returns a fresh instance of the given cipher.
+func (cipher CipherFunction) new(key []byte) (block cipher.Block) {
+        switch cipher {
+        case Cipher3DES:
+                block, _ = des.NewTripleDESCipher(key)
+        case CipherCAST5:
+                block, _ = cast5.NewCipher(key)
+        case CipherAES128, CipherAES192, CipherAES256:
+                block, _ = aes.NewCipher(key)
+        }
+        return
+}
+
+// readMPI reads a big integer from r. The bit length returned is the bit
+// length that was specified in r. This is preserved so that the integer can be
+// reserialized exactly.
+func readMPI(r io.Reader) (mpi []byte, bitLength uint16, err error) {
+        var buf [2]byte
+        _, err = readFull(r, buf[0:])
+        if err != nil {
+                return
+        }
+        bitLength = uint16(buf[0])<<8 | uint16(buf[1])
+        numBytes := (int(bitLength) + 7) / 8
+        mpi = make([]byte, numBytes)
+        _, err = readFull(r, mpi)
+        return
+}
+
+// mpiLength returns the length of the given *big.Int when serialized as an
+// MPI.
+func mpiLength(n *big.Int) (mpiLengthInBytes int) {
+        mpiLengthInBytes = 2 /* MPI length */
+        mpiLengthInBytes += (n.BitLen() + 7) / 8
+        return
+}
+
+// writeMPI serializes a big integer to w.
+func writeMPI(w io.Writer, bitLength uint16, mpiBytes []byte) (err error) {
+        _, err = w.Write([]byte{byte(bitLength >> 8), byte(bitLength)})
+        if err == nil {
+                _, err = w.Write(mpiBytes)
+        }
+        return
+}
+
+// writeBig serializes a *big.Int to w.
+func writeBig(w io.Writer, i *big.Int) error {
+        return writeMPI(w, uint16(i.BitLen()), i.Bytes())
+}
+
+// CompressionAlgo Represents the different compression algorithms
+// supported by OpenPGP (except for BZIP2, which is not currently
+// supported). See Section 9.3 of RFC 4880.
+type CompressionAlgo uint8
+
+const (
+        CompressionNone CompressionAlgo = 0
+        CompressionZIP  CompressionAlgo = 1
+        CompressionZLIB CompressionAlgo = 2
+)
diff --git a/vendor/golang.org/x/crypto/openpgp/packet/private_key.go b/vendor/golang.org/x/crypto/openpgp/packet/private_key.go
new file mode 100644
index 0000000..34734cc
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/packet/private_key.go
@@ -0,0 +1,380 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+        "bytes"
+        "crypto"
+        "crypto/cipher"
+        "crypto/dsa"
+        "crypto/ecdsa"
+        "crypto/rsa"
+        "crypto/sha1"
+        "io"
+        "io/ioutil"
+        "math/big"
+        "strconv"
+        "time"
+
+        "golang.org/x/crypto/openpgp/elgamal"
+        "golang.org/x/crypto/openpgp/errors"
+        "golang.org/x/crypto/openpgp/s2k"
+)
+
+// PrivateKey represents a possibly encrypted private key. See RFC 4880,
+// section 5.5.3.
+type PrivateKey struct {
+        PublicKey
+        Encrypted     bool // if true then the private key is unavailable until Decrypt has been called.
+        encryptedData []byte
+        cipher        CipherFunction
+        s2k           func(out, in []byte)
+        PrivateKey    interface{} // An *{rsa|dsa|ecdsa}.PrivateKey or a crypto.Signer.
+        sha1Checksum  bool
+        iv            []byte
+}
+
+func NewRSAPrivateKey(currentTime time.Time, priv *rsa.PrivateKey) *PrivateKey {
+        pk := new(PrivateKey)
+        pk.PublicKey = *NewRSAPublicKey(currentTime, &priv.PublicKey)
+        pk.PrivateKey = priv
+        return pk
+}
+
+func NewDSAPrivateKey(currentTime time.Time, priv *dsa.PrivateKey) *PrivateKey {
+        pk := new(PrivateKey)
+        pk.PublicKey = *NewDSAPublicKey(currentTime, &priv.PublicKey)
+        pk.PrivateKey = priv
+        return pk
+}
+
+func NewElGamalPrivateKey(currentTime time.Time, priv *elgamal.PrivateKey) *PrivateKey {
+        pk := new(PrivateKey)
+        pk.PublicKey = *NewElGamalPublicKey(currentTime, &priv.PublicKey)
+        pk.PrivateKey = priv
+        return pk
+}
+
+func NewECDSAPrivateKey(currentTime time.Time, priv *ecdsa.PrivateKey) *PrivateKey {
+        pk := new(PrivateKey)
+        pk.PublicKey = *NewECDSAPublicKey(currentTime, &priv.PublicKey)
+        pk.PrivateKey = priv
+        return pk
+}
+
+// NewSignerPrivateKey creates a sign-only PrivateKey from a crypto.Signer that
+// implements RSA or ECDSA.
+func NewSignerPrivateKey(currentTime time.Time, signer crypto.Signer) *PrivateKey {
+        pk := new(PrivateKey)
+        switch pubkey := signer.Public().(type) {
+        case rsa.PublicKey:
+                pk.PublicKey = *NewRSAPublicKey(currentTime, &pubkey)
+                pk.PubKeyAlgo = PubKeyAlgoRSASignOnly
+        case ecdsa.PublicKey:
+                pk.PublicKey = *NewECDSAPublicKey(currentTime, &pubkey)
+        default:
+                panic("openpgp: unknown crypto.Signer type in NewSignerPrivateKey")
+        }
+        pk.PrivateKey = signer
+        return pk
+}
+
+func (pk *PrivateKey) parse(r io.Reader) (err error) {
+        err = (&pk.PublicKey).parse(r)
+        if err != nil {
+                return
+        }
+        var buf [1]byte
+        _, err = readFull(r, buf[:])
+        if err != nil {
+                return
+        }
+
+        s2kType := buf[0]
+
+        switch s2kType {
+        case 0:
+                pk.s2k = nil
+                pk.Encrypted = false
+        case 254, 255:
+                _, err = readFull(r, buf[:])
+                if err != nil {
+                        return
+                }
+                pk.cipher = CipherFunction(buf[0])
+                pk.Encrypted = true
+                pk.s2k, err = s2k.Parse(r)
+                if err != nil {
+                        return
+                }
+                if s2kType == 254 {
+                        pk.sha1Checksum = true
+                }
+        default:
+                return errors.UnsupportedError("deprecated s2k function in private key")
+        }
+
+        if pk.Encrypted {
+                blockSize := pk.cipher.blockSize()
+                if blockSize == 0 {
+                        return errors.UnsupportedError("unsupported cipher in private key: " + strconv.Itoa(int(pk.cipher)))
+                }
+                pk.iv = make([]byte, blockSize)
+                _, err = readFull(r, pk.iv)
+                if err != nil {
+                        return
+                }
+        }
+
+        pk.encryptedData, err = ioutil.ReadAll(r)
+        if err != nil {
+                return
+        }
+
+        if !pk.Encrypted {
+                return pk.parsePrivateKey(pk.encryptedData)
+        }
+
+        return
+}
+
+func mod64kHash(d []byte) uint16 {
+        var h uint16
+        for _, b := range d {
+                h += uint16(b)
+        }
+        return h
+}
+
+func (pk *PrivateKey) Serialize(w io.Writer) (err error) {
+        // TODO(agl): support encrypted private keys
+        buf := bytes.NewBuffer(nil)
+        err = pk.PublicKey.serializeWithoutHeaders(buf)
+        if err != nil {
+                return
+        }
+        buf.WriteByte(0 /* no encryption */)
+
+        privateKeyBuf := bytes.NewBuffer(nil)
+
+        switch priv := pk.PrivateKey.(type) {
+        case *rsa.PrivateKey:
+                err = serializeRSAPrivateKey(privateKeyBuf, priv)
+        case *dsa.PrivateKey:
+                err = serializeDSAPrivateKey(privateKeyBuf, priv)
+        case *elgamal.PrivateKey:
+                err = serializeElGamalPrivateKey(privateKeyBuf, priv)
+        case *ecdsa.PrivateKey:
+                err = serializeECDSAPrivateKey(privateKeyBuf, priv)
+        default:
+                err = errors.InvalidArgumentError("unknown private key type")
+        }
+        if err != nil {
+                return
+        }
+
+        ptype := packetTypePrivateKey
+        contents := buf.Bytes()
+        privateKeyBytes := privateKeyBuf.Bytes()
+        if pk.IsSubkey {
+                ptype = packetTypePrivateSubkey
+        }
+        err = serializeHeader(w, ptype, len(contents)+len(privateKeyBytes)+2)
+        if err != nil {
+                return
+        }
+        _, err = w.Write(contents)
+        if err != nil {
+                return
+        }
+        _, err = w.Write(privateKeyBytes)
+        if err != nil {
+                return
+        }
+
+        checksum := mod64kHash(privateKeyBytes)
+        var checksumBytes [2]byte
+        checksumBytes[0] = byte(checksum >> 8)
+        checksumBytes[1] = byte(checksum)
+        _, err = w.Write(checksumBytes[:])
+
+        return
+}
+
+func serializeRSAPrivateKey(w io.Writer, priv *rsa.PrivateKey) error {
+        err := writeBig(w, priv.D)
+        if err != nil {
+                return err
+        }
+        err = writeBig(w, priv.Primes[1])
+        if err != nil {
+                return err
+        }
+        err = writeBig(w, priv.Primes[0])
+        if err != nil {
+                return err
+        }
+        return writeBig(w, priv.Precomputed.Qinv)
+}
+
+func serializeDSAPrivateKey(w io.Writer, priv *dsa.PrivateKey) error {
+        return writeBig(w, priv.X)
+}
+
+func serializeElGamalPrivateKey(w io.Writer, priv *elgamal.PrivateKey) error {
+        return writeBig(w, priv.X)
+}
+
+func serializeECDSAPrivateKey(w io.Writer, priv *ecdsa.PrivateKey) error {
+        return writeBig(w, priv.D)
+}
+
+// Decrypt decrypts an encrypted private key using a passphrase.
+func (pk *PrivateKey) Decrypt(passphrase []byte) error {
+        if !pk.Encrypted {
+                return nil
+        }
+
+        key := make([]byte, pk.cipher.KeySize())
+        pk.s2k(key, passphrase)
+        block := pk.cipher.new(key)
+        cfb := cipher.NewCFBDecrypter(block, pk.iv)
+
+        data := make([]byte, len(pk.encryptedData))
+        cfb.XORKeyStream(data, pk.encryptedData)
+
+        if pk.sha1Checksum {
+                if len(data) < sha1.Size {
+                        return errors.StructuralError("truncated private key data")
+                }
+                h := sha1.New()
+                h.Write(data[:len(data)-sha1.Size])
+                sum := h.Sum(nil)
+                if !bytes.Equal(sum, data[len(data)-sha1.Size:]) {
+                        return errors.StructuralError("private key checksum failure")
+                }
+                data = data[:len(data)-sha1.Size]
+        } else {
+                if len(data) < 2 {
+                        return errors.StructuralError("truncated private key data")
+                }
+                var sum uint16
+                for i := 0; i < len(data)-2; i++ {
+                        sum += uint16(data[i])
+                }
+                if data[len(data)-2] != uint8(sum>>8) ||
+                        data[len(data)-1] != uint8(sum) {
+                        return errors.StructuralError("private key checksum failure")
+                }
+                data = data[:len(data)-2]
+        }
+
+        return pk.parsePrivateKey(data)
+}
+
+func (pk *PrivateKey) parsePrivateKey(data []byte) (err error) {
+        switch pk.PublicKey.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly, PubKeyAlgoRSAEncryptOnly:
+                return pk.parseRSAPrivateKey(data)
+        case PubKeyAlgoDSA:
+                return pk.parseDSAPrivateKey(data)
+        case PubKeyAlgoElGamal:
+                return pk.parseElGamalPrivateKey(data)
+        case PubKeyAlgoECDSA:
+                return pk.parseECDSAPrivateKey(data)
+        }
+        panic("impossible")
+}
+
+func (pk *PrivateKey) parseRSAPrivateKey(data []byte) (err error) {
+        rsaPub := pk.PublicKey.PublicKey.(*rsa.PublicKey)
+        rsaPriv := new(rsa.PrivateKey)
+        rsaPriv.PublicKey = *rsaPub
+
+        buf := bytes.NewBuffer(data)
+        d, _, err := readMPI(buf)
+        if err != nil {
+                return
+        }
+        p, _, err := readMPI(buf)
+        if err != nil {
+                return
+        }
+        q, _, err := readMPI(buf)
+        if err != nil {
+                return
+        }
+
+        rsaPriv.D = new(big.Int).SetBytes(d)
+        rsaPriv.Primes = make([]*big.Int, 2)
+        rsaPriv.Primes[0] = new(big.Int).SetBytes(p)
+        rsaPriv.Primes[1] = new(big.Int).SetBytes(q)
+        if err := rsaPriv.Validate(); err != nil {
+                return err
+        }
+        rsaPriv.Precompute()
+        pk.PrivateKey = rsaPriv
+        pk.Encrypted = false
+        pk.encryptedData = nil
+
+        return nil
+}
+
+func (pk *PrivateKey) parseDSAPrivateKey(data []byte) (err error) {
+        dsaPub := pk.PublicKey.PublicKey.(*dsa.PublicKey)
+        dsaPriv := new(dsa.PrivateKey)
+        dsaPriv.PublicKey = *dsaPub
+
+        buf := bytes.NewBuffer(data)
+        x, _, err := readMPI(buf)
+        if err != nil {
+                return
+        }
+
+        dsaPriv.X = new(big.Int).SetBytes(x)
+        pk.PrivateKey = dsaPriv
+        pk.Encrypted = false
+        pk.encryptedData = nil
+
+        return nil
+}
+
+func (pk *PrivateKey) parseElGamalPrivateKey(data []byte) (err error) {
+        pub := pk.PublicKey.PublicKey.(*elgamal.PublicKey)
+        priv := new(elgamal.PrivateKey)
+        priv.PublicKey = *pub
+
+        buf := bytes.NewBuffer(data)
+        x, _, err := readMPI(buf)
+        if err != nil {
+                return
+        }
+
+        priv.X = new(big.Int).SetBytes(x)
+        pk.PrivateKey = priv
+        pk.Encrypted = false
+        pk.encryptedData = nil
+
+        return nil
+}
+
+func (pk *PrivateKey) parseECDSAPrivateKey(data []byte) (err error) {
+        ecdsaPub := pk.PublicKey.PublicKey.(*ecdsa.PublicKey)
+
+        buf := bytes.NewBuffer(data)
+        d, _, err := readMPI(buf)
+        if err != nil {
+                return
+        }
+
+        pk.PrivateKey = &ecdsa.PrivateKey{
+                PublicKey: *ecdsaPub,
+                D:         new(big.Int).SetBytes(d),
+        }
+        pk.Encrypted = false
+        pk.encryptedData = nil
+
+        return nil
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/packet/public_key.go b/vendor/golang.org/x/crypto/openpgp/packet/public_key.go
new file mode 100644
index 0000000..ead2623
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/packet/public_key.go
@@ -0,0 +1,748 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+        "bytes"
+        "crypto"
+        "crypto/dsa"
+        "crypto/ecdsa"
+        "crypto/elliptic"
+        "crypto/rsa"
+        "crypto/sha1"
+        _ "crypto/sha256"
+        _ "crypto/sha512"
+        "encoding/binary"
+        "fmt"
+        "hash"
+        "io"
+        "math/big"
+        "strconv"
+        "time"
+
+        "golang.org/x/crypto/openpgp/elgamal"
+        "golang.org/x/crypto/openpgp/errors"
+)
+
+var (
+        // NIST curve P-256
+        oidCurveP256 []byte = []byte{0x2A, 0x86, 0x48, 0xCE, 0x3D, 0x03, 0x01, 0x07}
+        // NIST curve P-384
+        oidCurveP384 []byte = []byte{0x2B, 0x81, 0x04, 0x00, 0x22}
+        // NIST curve P-521
+        oidCurveP521 []byte = []byte{0x2B, 0x81, 0x04, 0x00, 0x23}
+)
+
+const maxOIDLength = 8
+
+// ecdsaKey stores the algorithm-specific fields for ECDSA keys.
+// as defined in RFC 6637, Section 9.
+type ecdsaKey struct {
+        // oid contains the OID byte sequence identifying the elliptic curve used
+        oid []byte
+        // p contains the elliptic curve point that represents the public key
+        p parsedMPI
+}
+
+// parseOID reads the OID for the curve as defined in RFC 6637, Section 9.
+func parseOID(r io.Reader) (oid []byte, err error) {
+        buf := make([]byte, maxOIDLength)
+        if _, err = readFull(r, buf[:1]); err != nil {
+                return
+        }
+        oidLen := buf[0]
+        if int(oidLen) > len(buf) {
+                err = errors.UnsupportedError("invalid oid length: " + strconv.Itoa(int(oidLen)))
+                return
+        }
+        oid = buf[:oidLen]
+        _, err = readFull(r, oid)
+        return
+}
+
+func (f *ecdsaKey) parse(r io.Reader) (err error) {
+        if f.oid, err = parseOID(r); err != nil {
+                return err
+        }
+        f.p.bytes, f.p.bitLength, err = readMPI(r)
+        return
+}
+
+func (f *ecdsaKey) serialize(w io.Writer) (err error) {
+        buf := make([]byte, maxOIDLength+1)
+        buf[0] = byte(len(f.oid))
+        copy(buf[1:], f.oid)
+        if _, err = w.Write(buf[:len(f.oid)+1]); err != nil {
+                return
+        }
+        return writeMPIs(w, f.p)
+}
+
+func (f *ecdsaKey) newECDSA() (*ecdsa.PublicKey, error) {
+        var c elliptic.Curve
+        if bytes.Equal(f.oid, oidCurveP256) {
+                c = elliptic.P256()
+        } else if bytes.Equal(f.oid, oidCurveP384) {
+                c = elliptic.P384()
+        } else if bytes.Equal(f.oid, oidCurveP521) {
+                c = elliptic.P521()
+        } else {
+                return nil, errors.UnsupportedError(fmt.Sprintf("unsupported oid: %x", f.oid))
+        }
+        x, y := elliptic.Unmarshal(c, f.p.bytes)
+        if x == nil {
+                return nil, errors.UnsupportedError("failed to parse EC point")
+        }
+        return &ecdsa.PublicKey{Curve: c, X: x, Y: y}, nil
+}
+
+func (f *ecdsaKey) byteLen() int {
+        return 1 + len(f.oid) + 2 + len(f.p.bytes)
+}
+
+type kdfHashFunction byte
+type kdfAlgorithm byte
+
+// ecdhKdf stores key derivation function parameters
+// used for ECDH encryption. See RFC 6637, Section 9.
+type ecdhKdf struct {
+        KdfHash kdfHashFunction
+        KdfAlgo kdfAlgorithm
+}
+
+func (f *ecdhKdf) parse(r io.Reader) (err error) {
+        buf := make([]byte, 1)
+        if _, err = readFull(r, buf); err != nil {
+                return
+        }
+        kdfLen := int(buf[0])
+        if kdfLen < 3 {
+                return errors.UnsupportedError("Unsupported ECDH KDF length: " + strconv.Itoa(kdfLen))
+        }
+        buf = make([]byte, kdfLen)
+        if _, err = readFull(r, buf); err != nil {
+                return
+        }
+        reserved := int(buf[0])
+        f.KdfHash = kdfHashFunction(buf[1])
+        f.KdfAlgo = kdfAlgorithm(buf[2])
+        if reserved != 0x01 {
+                return errors.UnsupportedError("Unsupported KDF reserved field: " + strconv.Itoa(reserved))
+        }
+        return
+}
+
+func (f *ecdhKdf) serialize(w io.Writer) (err error) {
+        buf := make([]byte, 4)
+        // See RFC 6637, Section 9, Algorithm-Specific Fields for ECDH keys.
+        buf[0] = byte(0x03) // Length of the following fields
+        buf[1] = byte(0x01) // Reserved for future extensions, must be 1 for now
+        buf[2] = byte(f.KdfHash)
+        buf[3] = byte(f.KdfAlgo)
+        _, err = w.Write(buf[:])
+        return
+}
+
+func (f *ecdhKdf) byteLen() int {
+        return 4
+}
+
+// PublicKey represents an OpenPGP public key. See RFC 4880, section 5.5.2.
+type PublicKey struct {
+        CreationTime time.Time
+        PubKeyAlgo   PublicKeyAlgorithm
+        PublicKey    interface{} // *rsa.PublicKey, *dsa.PublicKey or *ecdsa.PublicKey
+        Fingerprint  [20]byte
+        KeyId        uint64
+        IsSubkey     bool
+
+        n, e, p, q, g, y parsedMPI
+
+        // RFC 6637 fields
+        ec   *ecdsaKey
+        ecdh *ecdhKdf
+}
+
+// signingKey provides a convenient abstraction over signature verification
+// for v3 and v4 public keys.
+type signingKey interface {
+        SerializeSignaturePrefix(io.Writer)
+        serializeWithoutHeaders(io.Writer) error
+}
+
+func fromBig(n *big.Int) parsedMPI {
+        return parsedMPI{
+                bytes:     n.Bytes(),
+                bitLength: uint16(n.BitLen()),
+        }
+}
+
+// NewRSAPublicKey returns a PublicKey that wraps the given rsa.PublicKey.
+func NewRSAPublicKey(creationTime time.Time, pub *rsa.PublicKey) *PublicKey {
+        pk := &PublicKey{
+                CreationTime: creationTime,
+                PubKeyAlgo:   PubKeyAlgoRSA,
+                PublicKey:    pub,
+                n:            fromBig(pub.N),
+                e:            fromBig(big.NewInt(int64(pub.E))),
+        }
+
+        pk.setFingerPrintAndKeyId()
+        return pk
+}
+
+// NewDSAPublicKey returns a PublicKey that wraps the given dsa.PublicKey.
+func NewDSAPublicKey(creationTime time.Time, pub *dsa.PublicKey) *PublicKey {
+        pk := &PublicKey{
+                CreationTime: creationTime,
+                PubKeyAlgo:   PubKeyAlgoDSA,
+                PublicKey:    pub,
+                p:            fromBig(pub.P),
+                q:            fromBig(pub.Q),
+                g:            fromBig(pub.G),
+                y:            fromBig(pub.Y),
+        }
+
+        pk.setFingerPrintAndKeyId()
+        return pk
+}
+
+// NewElGamalPublicKey returns a PublicKey that wraps the given elgamal.PublicKey.
+func NewElGamalPublicKey(creationTime time.Time, pub *elgamal.PublicKey) *PublicKey {
+        pk := &PublicKey{
+                CreationTime: creationTime,
+                PubKeyAlgo:   PubKeyAlgoElGamal,
+                PublicKey:    pub,
+                p:            fromBig(pub.P),
+                g:            fromBig(pub.G),
+                y:            fromBig(pub.Y),
+        }
+
+        pk.setFingerPrintAndKeyId()
+        return pk
+}
+
+func NewECDSAPublicKey(creationTime time.Time, pub *ecdsa.PublicKey) *PublicKey {
+        pk := &PublicKey{
+                CreationTime: creationTime,
+                PubKeyAlgo:   PubKeyAlgoECDSA,
+                PublicKey:    pub,
+                ec:           new(ecdsaKey),
+        }
+
+        switch pub.Curve {
+        case elliptic.P256():
+                pk.ec.oid = oidCurveP256
+        case elliptic.P384():
+                pk.ec.oid = oidCurveP384
+        case elliptic.P521():
+                pk.ec.oid = oidCurveP521
+        default:
+                panic("unknown elliptic curve")
+        }
+
+        pk.ec.p.bytes = elliptic.Marshal(pub.Curve, pub.X, pub.Y)
+        pk.ec.p.bitLength = uint16(8 * len(pk.ec.p.bytes))
+
+        pk.setFingerPrintAndKeyId()
+        return pk
+}
+
+func (pk *PublicKey) parse(r io.Reader) (err error) {
+        // RFC 4880, section 5.5.2
+        var buf [6]byte
+        _, err = readFull(r, buf[:])
+        if err != nil {
+                return
+        }
+        if buf[0] != 4 {
+                return errors.UnsupportedError("public key version")
+        }
+        pk.CreationTime = time.Unix(int64(uint32(buf[1])<<24|uint32(buf[2])<<16|uint32(buf[3])<<8|uint32(buf[4])), 0)
+        pk.PubKeyAlgo = PublicKeyAlgorithm(buf[5])
+        switch pk.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
+                err = pk.parseRSA(r)
+        case PubKeyAlgoDSA:
+                err = pk.parseDSA(r)
+        case PubKeyAlgoElGamal:
+                err = pk.parseElGamal(r)
+        case PubKeyAlgoECDSA:
+                pk.ec = new(ecdsaKey)
+                if err = pk.ec.parse(r); err != nil {
+                        return err
+                }
+                pk.PublicKey, err = pk.ec.newECDSA()
+        case PubKeyAlgoECDH:
+                pk.ec = new(ecdsaKey)
+                if err = pk.ec.parse(r); err != nil {
+                        return
+                }
+                pk.ecdh = new(ecdhKdf)
+                if err = pk.ecdh.parse(r); err != nil {
+                        return
+                }
+                // The ECDH key is stored in an ecdsa.PublicKey for convenience.
+                pk.PublicKey, err = pk.ec.newECDSA()
+        default:
+                err = errors.UnsupportedError("public key type: " + strconv.Itoa(int(pk.PubKeyAlgo)))
+        }
+        if err != nil {
+                return
+        }
+
+        pk.setFingerPrintAndKeyId()
+        return
+}
+
+func (pk *PublicKey) setFingerPrintAndKeyId() {
+        // RFC 4880, section 12.2
+        fingerPrint := sha1.New()
+        pk.SerializeSignaturePrefix(fingerPrint)
+        pk.serializeWithoutHeaders(fingerPrint)
+        copy(pk.Fingerprint[:], fingerPrint.Sum(nil))
+        pk.KeyId = binary.BigEndian.Uint64(pk.Fingerprint[12:20])
+}
+
+// parseRSA parses RSA public key material from the given Reader. See RFC 4880,
+// section 5.5.2.
+func (pk *PublicKey) parseRSA(r io.Reader) (err error) {
+        pk.n.bytes, pk.n.bitLength, err = readMPI(r)
+        if err != nil {
+                return
+        }
+        pk.e.bytes, pk.e.bitLength, err = readMPI(r)
+        if err != nil {
+                return
+        }
+
+        if len(pk.e.bytes) > 3 {
+                err = errors.UnsupportedError("large public exponent")
+                return
+        }
+        rsa := &rsa.PublicKey{
+                N: new(big.Int).SetBytes(pk.n.bytes),
+                E: 0,
+        }
+        for i := 0; i < len(pk.e.bytes); i++ {
+                rsa.E <<= 8
+                rsa.E |= int(pk.e.bytes[i])
+        }
+        pk.PublicKey = rsa
+        return
+}
+
+// parseDSA parses DSA public key material from the given Reader. See RFC 4880,
+// section 5.5.2.
+func (pk *PublicKey) parseDSA(r io.Reader) (err error) {
+        pk.p.bytes, pk.p.bitLength, err = readMPI(r)
+        if err != nil {
+                return
+        }
+        pk.q.bytes, pk.q.bitLength, err = readMPI(r)
+        if err != nil {
+                return
+        }
+        pk.g.bytes, pk.g.bitLength, err = readMPI(r)
+        if err != nil {
+                return
+        }
+        pk.y.bytes, pk.y.bitLength, err = readMPI(r)
+        if err != nil {
+                return
+        }
+
+        dsa := new(dsa.PublicKey)
+        dsa.P = new(big.Int).SetBytes(pk.p.bytes)
+        dsa.Q = new(big.Int).SetBytes(pk.q.bytes)
+        dsa.G = new(big.Int).SetBytes(pk.g.bytes)
+        dsa.Y = new(big.Int).SetBytes(pk.y.bytes)
+        pk.PublicKey = dsa
+        return
+}
+
+// parseElGamal parses ElGamal public key material from the given Reader. See
+// RFC 4880, section 5.5.2.
+func (pk *PublicKey) parseElGamal(r io.Reader) (err error) {
+        pk.p.bytes, pk.p.bitLength, err = readMPI(r)
+        if err != nil {
+                return
+        }
+        pk.g.bytes, pk.g.bitLength, err = readMPI(r)
+        if err != nil {
+                return
+        }
+        pk.y.bytes, pk.y.bitLength, err = readMPI(r)
+        if err != nil {
+                return
+        }
+
+        elgamal := new(elgamal.PublicKey)
+        elgamal.P = new(big.Int).SetBytes(pk.p.bytes)
+        elgamal.G = new(big.Int).SetBytes(pk.g.bytes)
+        elgamal.Y = new(big.Int).SetBytes(pk.y.bytes)
+        pk.PublicKey = elgamal
+        return
+}
+
+// SerializeSignaturePrefix writes the prefix for this public key to the given Writer.
+// The prefix is used when calculating a signature over this public key. See
+// RFC 4880, section 5.2.4.
+func (pk *PublicKey) SerializeSignaturePrefix(h io.Writer) {
+        var pLength uint16
+        switch pk.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
+                pLength += 2 + uint16(len(pk.n.bytes))
+                pLength += 2 + uint16(len(pk.e.bytes))
+        case PubKeyAlgoDSA:
+                pLength += 2 + uint16(len(pk.p.bytes))
+                pLength += 2 + uint16(len(pk.q.bytes))
+                pLength += 2 + uint16(len(pk.g.bytes))
+                pLength += 2 + uint16(len(pk.y.bytes))
+        case PubKeyAlgoElGamal:
+                pLength += 2 + uint16(len(pk.p.bytes))
+                pLength += 2 + uint16(len(pk.g.bytes))
+                pLength += 2 + uint16(len(pk.y.bytes))
+        case PubKeyAlgoECDSA:
+                pLength += uint16(pk.ec.byteLen())
+        case PubKeyAlgoECDH:
+                pLength += uint16(pk.ec.byteLen())
+                pLength += uint16(pk.ecdh.byteLen())
+        default:
+                panic("unknown public key algorithm")
+        }
+        pLength += 6
+        h.Write([]byte{0x99, byte(pLength >> 8), byte(pLength)})
+        return
+}
+
+func (pk *PublicKey) Serialize(w io.Writer) (err error) {
+        length := 6 // 6 byte header
+
+        switch pk.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
+                length += 2 + len(pk.n.bytes)
+                length += 2 + len(pk.e.bytes)
+        case PubKeyAlgoDSA:
+                length += 2 + len(pk.p.bytes)
+                length += 2 + len(pk.q.bytes)
+                length += 2 + len(pk.g.bytes)
+                length += 2 + len(pk.y.bytes)
+        case PubKeyAlgoElGamal:
+                length += 2 + len(pk.p.bytes)
+                length += 2 + len(pk.g.bytes)
+                length += 2 + len(pk.y.bytes)
+        case PubKeyAlgoECDSA:
+                length += pk.ec.byteLen()
+        case PubKeyAlgoECDH:
+                length += pk.ec.byteLen()
+                length += pk.ecdh.byteLen()
+        default:
+                panic("unknown public key algorithm")
+        }
+
+        packetType := packetTypePublicKey
+        if pk.IsSubkey {
+                packetType = packetTypePublicSubkey
+        }
+        err = serializeHeader(w, packetType, length)
+        if err != nil {
+                return
+        }
+        return pk.serializeWithoutHeaders(w)
+}
+
+// serializeWithoutHeaders marshals the PublicKey to w in the form of an
+// OpenPGP public key packet, not including the packet header.
+func (pk *PublicKey) serializeWithoutHeaders(w io.Writer) (err error) {
+        var buf [6]byte
+        buf[0] = 4
+        t := uint32(pk.CreationTime.Unix())
+        buf[1] = byte(t >> 24)
+        buf[2] = byte(t >> 16)
+        buf[3] = byte(t >> 8)
+        buf[4] = byte(t)
+        buf[5] = byte(pk.PubKeyAlgo)
+
+        _, err = w.Write(buf[:])
+        if err != nil {
+                return
+        }
+
+        switch pk.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
+                return writeMPIs(w, pk.n, pk.e)
+        case PubKeyAlgoDSA:
+                return writeMPIs(w, pk.p, pk.q, pk.g, pk.y)
+        case PubKeyAlgoElGamal:
+                return writeMPIs(w, pk.p, pk.g, pk.y)
+        case PubKeyAlgoECDSA:
+                return pk.ec.serialize(w)
+        case PubKeyAlgoECDH:
+                if err = pk.ec.serialize(w); err != nil {
+                        return
+                }
+                return pk.ecdh.serialize(w)
+        }
+        return errors.InvalidArgumentError("bad public-key algorithm")
+}
+
+// CanSign returns true iff this public key can generate signatures
+func (pk *PublicKey) CanSign() bool {
+        return pk.PubKeyAlgo != PubKeyAlgoRSAEncryptOnly && pk.PubKeyAlgo != PubKeyAlgoElGamal
+}
+
+// VerifySignature returns nil iff sig is a valid signature, made by this
+// public key, of the data hashed into signed. signed is mutated by this call.
+func (pk *PublicKey) VerifySignature(signed hash.Hash, sig *Signature) (err error) {
+        if !pk.CanSign() {
+                return errors.InvalidArgumentError("public key cannot generate signatures")
+        }
+
+        signed.Write(sig.HashSuffix)
+        hashBytes := signed.Sum(nil)
+
+        if hashBytes[0] != sig.HashTag[0] || hashBytes[1] != sig.HashTag[1] {
+                return errors.SignatureError("hash tag doesn't match")
+        }
+
+        if pk.PubKeyAlgo != sig.PubKeyAlgo {
+                return errors.InvalidArgumentError("public key and signature use different algorithms")
+        }
+
+        switch pk.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
+                rsaPublicKey, _ := pk.PublicKey.(*rsa.PublicKey)
+                err = rsa.VerifyPKCS1v15(rsaPublicKey, sig.Hash, hashBytes, sig.RSASignature.bytes)
+                if err != nil {
+                        return errors.SignatureError("RSA verification failure")
+                }
+                return nil
+        case PubKeyAlgoDSA:
+                dsaPublicKey, _ := pk.PublicKey.(*dsa.PublicKey)
+                // Need to truncate hashBytes to match FIPS 186-3 section 4.6.
+                subgroupSize := (dsaPublicKey.Q.BitLen() + 7) / 8
+                if len(hashBytes) > subgroupSize {
+                        hashBytes = hashBytes[:subgroupSize]
+                }
+                if !dsa.Verify(dsaPublicKey, hashBytes, new(big.Int).SetBytes(sig.DSASigR.bytes), new(big.Int).SetBytes(sig.DSASigS.bytes)) {
+                        return errors.SignatureError("DSA verification failure")
+                }
+                return nil
+        case PubKeyAlgoECDSA:
+                ecdsaPublicKey := pk.PublicKey.(*ecdsa.PublicKey)
+                if !ecdsa.Verify(ecdsaPublicKey, hashBytes, new(big.Int).SetBytes(sig.ECDSASigR.bytes), new(big.Int).SetBytes(sig.ECDSASigS.bytes)) {
+                        return errors.SignatureError("ECDSA verification failure")
+                }
+                return nil
+        default:
+                return errors.SignatureError("Unsupported public key algorithm used in signature")
+        }
+}
+
+// VerifySignatureV3 returns nil iff sig is a valid signature, made by this
+// public key, of the data hashed into signed. signed is mutated by this call.
+func (pk *PublicKey) VerifySignatureV3(signed hash.Hash, sig *SignatureV3) (err error) {
+        if !pk.CanSign() {
+                return errors.InvalidArgumentError("public key cannot generate signatures")
+        }
+
+        suffix := make([]byte, 5)
+        suffix[0] = byte(sig.SigType)
+        binary.BigEndian.PutUint32(suffix[1:], uint32(sig.CreationTime.Unix()))
+        signed.Write(suffix)
+        hashBytes := signed.Sum(nil)
+
+        if hashBytes[0] != sig.HashTag[0] || hashBytes[1] != sig.HashTag[1] {
+                return errors.SignatureError("hash tag doesn't match")
+        }
+
+        if pk.PubKeyAlgo != sig.PubKeyAlgo {
+                return errors.InvalidArgumentError("public key and signature use different algorithms")
+        }
+
+        switch pk.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
+                rsaPublicKey := pk.PublicKey.(*rsa.PublicKey)
+                if err = rsa.VerifyPKCS1v15(rsaPublicKey, sig.Hash, hashBytes, sig.RSASignature.bytes); err != nil {
+                        return errors.SignatureError("RSA verification failure")
+                }
+                return
+        case PubKeyAlgoDSA:
+                dsaPublicKey := pk.PublicKey.(*dsa.PublicKey)
+                // Need to truncate hashBytes to match FIPS 186-3 section 4.6.
+                subgroupSize := (dsaPublicKey.Q.BitLen() + 7) / 8
+                if len(hashBytes) > subgroupSize {
+                        hashBytes = hashBytes[:subgroupSize]
+                }
+                if !dsa.Verify(dsaPublicKey, hashBytes, new(big.Int).SetBytes(sig.DSASigR.bytes), new(big.Int).SetBytes(sig.DSASigS.bytes)) {
+                        return errors.SignatureError("DSA verification failure")
+                }
+                return nil
+        default:
+                panic("shouldn't happen")
+        }
+}
+
+// keySignatureHash returns a Hash of the message that needs to be signed for
+// pk to assert a subkey relationship to signed.
+func keySignatureHash(pk, signed signingKey, hashFunc crypto.Hash) (h hash.Hash, err error) {
+        if !hashFunc.Available() {
+                return nil, errors.UnsupportedError("hash function")
+        }
+        h = hashFunc.New()
+
+        // RFC 4880, section 5.2.4
+        pk.SerializeSignaturePrefix(h)
+        pk.serializeWithoutHeaders(h)
+        signed.SerializeSignaturePrefix(h)
+        signed.serializeWithoutHeaders(h)
+        return
+}
+
+// VerifyKeySignature returns nil iff sig is a valid signature, made by this
+// public key, of signed.
+func (pk *PublicKey) VerifyKeySignature(signed *PublicKey, sig *Signature) error {
+        h, err := keySignatureHash(pk, signed, sig.Hash)
+        if err != nil {
+                return err
+        }
+        if err = pk.VerifySignature(h, sig); err != nil {
+                return err
+        }
+
+        if sig.FlagSign {
+                // Signing subkeys must be cross-signed. See
+                // https://www.gnupg.org/faq/subkey-cross-certify.html.
+                if sig.EmbeddedSignature == nil {
+                        return errors.StructuralError("signing subkey is missing cross-signature")
+                }
+                // Verify the cross-signature. This is calculated over the same
+                // data as the main signature, so we cannot just recursively
+                // call signed.VerifyKeySignature(...)
+                if h, err = keySignatureHash(pk, signed, sig.EmbeddedSignature.Hash); err != nil {
+                        return errors.StructuralError("error while hashing for cross-signature: " + err.Error())
+                }
+                if err := signed.VerifySignature(h, sig.EmbeddedSignature); err != nil {
+                        return errors.StructuralError("error while verifying cross-signature: " + err.Error())
+                }
+        }
+
+        return nil
+}
+
+func keyRevocationHash(pk signingKey, hashFunc crypto.Hash) (h hash.Hash, err error) {
+        if !hashFunc.Available() {
+                return nil, errors.UnsupportedError("hash function")
+        }
+        h = hashFunc.New()
+
+        // RFC 4880, section 5.2.4
+        pk.SerializeSignaturePrefix(h)
+        pk.serializeWithoutHeaders(h)
+
+        return
+}
+
+// VerifyRevocationSignature returns nil iff sig is a valid signature, made by this
+// public key.
+func (pk *PublicKey) VerifyRevocationSignature(sig *Signature) (err error) {
+        h, err := keyRevocationHash(pk, sig.Hash)
+        if err != nil {
+                return err
+        }
+        return pk.VerifySignature(h, sig)
+}
+
+// userIdSignatureHash returns a Hash of the message that needs to be signed
+// to assert that pk is a valid key for id.
+func userIdSignatureHash(id string, pk *PublicKey, hashFunc crypto.Hash) (h hash.Hash, err error) {
+        if !hashFunc.Available() {
+                return nil, errors.UnsupportedError("hash function")
+        }
+        h = hashFunc.New()
+
+        // RFC 4880, section 5.2.4
+        pk.SerializeSignaturePrefix(h)
+        pk.serializeWithoutHeaders(h)
+
+        var buf [5]byte
+        buf[0] = 0xb4
+        buf[1] = byte(len(id) >> 24)
+        buf[2] = byte(len(id) >> 16)
+        buf[3] = byte(len(id) >> 8)
+        buf[4] = byte(len(id))
+        h.Write(buf[:])
+        h.Write([]byte(id))
+
+        return
+}
+
+// VerifyUserIdSignature returns nil iff sig is a valid signature, made by this
+// public key, that id is the identity of pub.
+func (pk *PublicKey) VerifyUserIdSignature(id string, pub *PublicKey, sig *Signature) (err error) {
+        h, err := userIdSignatureHash(id, pub, sig.Hash)
+        if err != nil {
+                return err
+        }
+        return pk.VerifySignature(h, sig)
+}
+
+// VerifyUserIdSignatureV3 returns nil iff sig is a valid signature, made by this
+// public key, that id is the identity of pub.
+func (pk *PublicKey) VerifyUserIdSignatureV3(id string, pub *PublicKey, sig *SignatureV3) (err error) {
+        h, err := userIdSignatureV3Hash(id, pub, sig.Hash)
+        if err != nil {
+                return err
+        }
+        return pk.VerifySignatureV3(h, sig)
+}
+
+// KeyIdString returns the public key's fingerprint in capital hex
+// (e.g. "6C7EE1B8621CC013").
+func (pk *PublicKey) KeyIdString() string {
+        return fmt.Sprintf("%X", pk.Fingerprint[12:20])
+}
+
+// KeyIdShortString returns the short form of public key's fingerprint
+// in capital hex, as shown by gpg --list-keys (e.g. "621CC013").
+func (pk *PublicKey) KeyIdShortString() string {
+        return fmt.Sprintf("%X", pk.Fingerprint[16:20])
+}
+
+// A parsedMPI is used to store the contents of a big integer, along with the
+// bit length that was specified in the original input. This allows the MPI to
+// be reserialized exactly.
+type parsedMPI struct {
+        bytes     []byte
+        bitLength uint16
+}
+
+// writeMPIs is a utility function for serializing several big integers to the
+// given Writer.
+func writeMPIs(w io.Writer, mpis ...parsedMPI) (err error) {
+        for _, mpi := range mpis {
+                err = writeMPI(w, mpi.bitLength, mpi.bytes)
+                if err != nil {
+                        return
+                }
+        }
+        return
+}
+
+// BitLength returns the bit length for the given public key.
+func (pk *PublicKey) BitLength() (bitLength uint16, err error) {
+        switch pk.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
+                bitLength = pk.n.bitLength
+        case PubKeyAlgoDSA:
+                bitLength = pk.p.bitLength
+        case PubKeyAlgoElGamal:
+                bitLength = pk.p.bitLength
+        default:
+                err = errors.InvalidArgumentError("bad public-key algorithm")
+        }
+        return
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/packet/public_key_v3.go b/vendor/golang.org/x/crypto/openpgp/packet/public_key_v3.go
new file mode 100644
index 0000000..5daf7b6
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/packet/public_key_v3.go
@@ -0,0 +1,279 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+        "crypto"
+        "crypto/md5"
+        "crypto/rsa"
+        "encoding/binary"
+        "fmt"
+        "hash"
+        "io"
+        "math/big"
+        "strconv"
+        "time"
+
+        "golang.org/x/crypto/openpgp/errors"
+)
+
+// PublicKeyV3 represents older, version 3 public keys. These keys are less secure and
+// should not be used for signing or encrypting. They are supported here only for
+// parsing version 3 key material and validating signatures.
+// See RFC 4880, section 5.5.2.
+type PublicKeyV3 struct {
+        CreationTime time.Time
+        DaysToExpire uint16
+        PubKeyAlgo   PublicKeyAlgorithm
+        PublicKey    *rsa.PublicKey
+        Fingerprint  [16]byte
+        KeyId        uint64
+        IsSubkey     bool
+
+        n, e parsedMPI
+}
+
+// newRSAPublicKeyV3 returns a PublicKey that wraps the given rsa.PublicKey.
+// Included here for testing purposes only. RFC 4880, section 5.5.2:
+// "an implementation MUST NOT generate a V3 key, but MAY accept it."
+func newRSAPublicKeyV3(creationTime time.Time, pub *rsa.PublicKey) *PublicKeyV3 {
+        pk := &PublicKeyV3{
+                CreationTime: creationTime,
+                PublicKey:    pub,
+                n:            fromBig(pub.N),
+                e:            fromBig(big.NewInt(int64(pub.E))),
+        }
+
+        pk.setFingerPrintAndKeyId()
+        return pk
+}
+
+func (pk *PublicKeyV3) parse(r io.Reader) (err error) {
+        // RFC 4880, section 5.5.2
+        var buf [8]byte
+        if _, err = readFull(r, buf[:]); err != nil {
+                return
+        }
+        if buf[0] < 2 || buf[0] > 3 {
+                return errors.UnsupportedError("public key version")
+        }
+        pk.CreationTime = time.Unix(int64(uint32(buf[1])<<24|uint32(buf[2])<<16|uint32(buf[3])<<8|uint32(buf[4])), 0)
+        pk.DaysToExpire = binary.BigEndian.Uint16(buf[5:7])
+        pk.PubKeyAlgo = PublicKeyAlgorithm(buf[7])
+        switch pk.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
+                err = pk.parseRSA(r)
+        default:
+                err = errors.UnsupportedError("public key type: " + strconv.Itoa(int(pk.PubKeyAlgo)))
+        }
+        if err != nil {
+                return
+        }
+
+        pk.setFingerPrintAndKeyId()
+        return
+}
+
+func (pk *PublicKeyV3) setFingerPrintAndKeyId() {
+        // RFC 4880, section 12.2
+        fingerPrint := md5.New()
+        fingerPrint.Write(pk.n.bytes)
+        fingerPrint.Write(pk.e.bytes)
+        fingerPrint.Sum(pk.Fingerprint[:0])
+        pk.KeyId = binary.BigEndian.Uint64(pk.n.bytes[len(pk.n.bytes)-8:])
+}
+
+// parseRSA parses RSA public key material from the given Reader. See RFC 4880,
+// section 5.5.2.
+func (pk *PublicKeyV3) parseRSA(r io.Reader) (err error) {
+        if pk.n.bytes, pk.n.bitLength, err = readMPI(r); err != nil {
+                return
+        }
+        if pk.e.bytes, pk.e.bitLength, err = readMPI(r); err != nil {
+                return
+        }
+
+        // RFC 4880 Section 12.2 requires the low 8 bytes of the
+        // modulus to form the key id.
+        if len(pk.n.bytes) < 8 {
+                return errors.StructuralError("v3 public key modulus is too short")
+        }
+        if len(pk.e.bytes) > 3 {
+                err = errors.UnsupportedError("large public exponent")
+                return
+        }
+        rsa := &rsa.PublicKey{N: new(big.Int).SetBytes(pk.n.bytes)}
+        for i := 0; i < len(pk.e.bytes); i++ {
+                rsa.E <<= 8
+                rsa.E |= int(pk.e.bytes[i])
+        }
+        pk.PublicKey = rsa
+        return
+}
+
+// SerializeSignaturePrefix writes the prefix for this public key to the given Writer.
+// The prefix is used when calculating a signature over this public key. See
+// RFC 4880, section 5.2.4.
+func (pk *PublicKeyV3) SerializeSignaturePrefix(w io.Writer) {
+        var pLength uint16
+        switch pk.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
+                pLength += 2 + uint16(len(pk.n.bytes))
+                pLength += 2 + uint16(len(pk.e.bytes))
+        default:
+                panic("unknown public key algorithm")
+        }
+        pLength += 6
+        w.Write([]byte{0x99, byte(pLength >> 8), byte(pLength)})
+        return
+}
+
+func (pk *PublicKeyV3) Serialize(w io.Writer) (err error) {
+        length := 8 // 8 byte header
+
+        switch pk.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
+                length += 2 + len(pk.n.bytes)
+                length += 2 + len(pk.e.bytes)
+        default:
+                panic("unknown public key algorithm")
+        }
+
+        packetType := packetTypePublicKey
+        if pk.IsSubkey {
+                packetType = packetTypePublicSubkey
+        }
+        if err = serializeHeader(w, packetType, length); err != nil {
+                return
+        }
+        return pk.serializeWithoutHeaders(w)
+}
+
+// serializeWithoutHeaders marshals the PublicKey to w in the form of an
+// OpenPGP public key packet, not including the packet header.
+func (pk *PublicKeyV3) serializeWithoutHeaders(w io.Writer) (err error) {
+        var buf [8]byte
+        // Version 3
+        buf[0] = 3
+        // Creation time
+        t := uint32(pk.CreationTime.Unix())
+        buf[1] = byte(t >> 24)
+        buf[2] = byte(t >> 16)
+        buf[3] = byte(t >> 8)
+        buf[4] = byte(t)
+        // Days to expire
+        buf[5] = byte(pk.DaysToExpire >> 8)
+        buf[6] = byte(pk.DaysToExpire)
+        // Public key algorithm
+        buf[7] = byte(pk.PubKeyAlgo)
+
+        if _, err = w.Write(buf[:]); err != nil {
+                return
+        }
+
+        switch pk.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
+                return writeMPIs(w, pk.n, pk.e)
+        }
+        return errors.InvalidArgumentError("bad public-key algorithm")
+}
+
+// CanSign returns true iff this public key can generate signatures
+func (pk *PublicKeyV3) CanSign() bool {
+        return pk.PubKeyAlgo != PubKeyAlgoRSAEncryptOnly
+}
+
+// VerifySignatureV3 returns nil iff sig is a valid signature, made by this
+// public key, of the data hashed into signed. signed is mutated by this call.
+func (pk *PublicKeyV3) VerifySignatureV3(signed hash.Hash, sig *SignatureV3) (err error) {
+        if !pk.CanSign() {
+                return errors.InvalidArgumentError("public key cannot generate signatures")
+        }
+
+        suffix := make([]byte, 5)
+        suffix[0] = byte(sig.SigType)
+        binary.BigEndian.PutUint32(suffix[1:], uint32(sig.CreationTime.Unix()))
+        signed.Write(suffix)
+        hashBytes := signed.Sum(nil)
+
+        if hashBytes[0] != sig.HashTag[0] || hashBytes[1] != sig.HashTag[1] {
+                return errors.SignatureError("hash tag doesn't match")
+        }
+
+        if pk.PubKeyAlgo != sig.PubKeyAlgo {
+                return errors.InvalidArgumentError("public key and signature use different algorithms")
+        }
+
+        switch pk.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
+                if err = rsa.VerifyPKCS1v15(pk.PublicKey, sig.Hash, hashBytes, sig.RSASignature.bytes); err != nil {
+                        return errors.SignatureError("RSA verification failure")
+                }
+                return
+        default:
+                // V3 public keys only support RSA.
+                panic("shouldn't happen")
+        }
+}
+
+// VerifyUserIdSignatureV3 returns nil iff sig is a valid signature, made by this
+// public key, that id is the identity of pub.
+func (pk *PublicKeyV3) VerifyUserIdSignatureV3(id string, pub *PublicKeyV3, sig *SignatureV3) (err error) {
+        h, err := userIdSignatureV3Hash(id, pk, sig.Hash)
+        if err != nil {
+                return err
+        }
+        return pk.VerifySignatureV3(h, sig)
+}
+
+// VerifyKeySignatureV3 returns nil iff sig is a valid signature, made by this
+// public key, of signed.
+func (pk *PublicKeyV3) VerifyKeySignatureV3(signed *PublicKeyV3, sig *SignatureV3) (err error) {
+        h, err := keySignatureHash(pk, signed, sig.Hash)
+        if err != nil {
+                return err
+        }
+        return pk.VerifySignatureV3(h, sig)
+}
+
+// userIdSignatureV3Hash returns a Hash of the message that needs to be signed
+// to assert that pk is a valid key for id.
+func userIdSignatureV3Hash(id string, pk signingKey, hfn crypto.Hash) (h hash.Hash, err error) {
+        if !hfn.Available() {
+                return nil, errors.UnsupportedError("hash function")
+        }
+        h = hfn.New()
+
+        // RFC 4880, section 5.2.4
+        pk.SerializeSignaturePrefix(h)
+        pk.serializeWithoutHeaders(h)
+
+        h.Write([]byte(id))
+
+        return
+}
+
+// KeyIdString returns the public key's fingerprint in capital hex
+// (e.g. "6C7EE1B8621CC013").
+func (pk *PublicKeyV3) KeyIdString() string {
+        return fmt.Sprintf("%X", pk.KeyId)
+}
+
+// KeyIdShortString returns the short form of public key's fingerprint
+// in capital hex, as shown by gpg --list-keys (e.g. "621CC013").
+func (pk *PublicKeyV3) KeyIdShortString() string {
+        return fmt.Sprintf("%X", pk.KeyId&0xFFFFFFFF)
+}
+
+// BitLength returns the bit length for the given public key.
+func (pk *PublicKeyV3) BitLength() (bitLength uint16, err error) {
+        switch pk.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
+                bitLength = pk.n.bitLength
+        default:
+                err = errors.InvalidArgumentError("bad public-key algorithm")
+        }
+        return
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/packet/reader.go b/vendor/golang.org/x/crypto/openpgp/packet/reader.go
new file mode 100644
index 0000000..34bc7c6
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/packet/reader.go
@@ -0,0 +1,76 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+        "golang.org/x/crypto/openpgp/errors"
+        "io"
+)
+
+// Reader reads packets from an io.Reader and allows packets to be 'unread' so
+// that they result from the next call to Next.
+type Reader struct {
+        q       []Packet
+        readers []io.Reader
+}
+
+// New io.Readers are pushed when a compressed or encrypted packet is processed
+// and recursively treated as a new source of packets. However, a carefully
+// crafted packet can trigger an infinite recursive sequence of packets. See
+// http://mumble.net/~campbell/misc/pgp-quine
+// https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-4402
+// This constant limits the number of recursive packets that may be pushed.
+const maxReaders = 32
+
+// Next returns the most recently unread Packet, or reads another packet from
+// the top-most io.Reader. Unknown packet types are skipped.
+func (r *Reader) Next() (p Packet, err error) {
+        if len(r.q) > 0 {
+                p = r.q[len(r.q)-1]
+                r.q = r.q[:len(r.q)-1]
+                return
+        }
+
+        for len(r.readers) > 0 {
+                p, err = Read(r.readers[len(r.readers)-1])
+                if err == nil {
+                        return
+                }
+                if err == io.EOF {
+                        r.readers = r.readers[:len(r.readers)-1]
+                        continue
+                }
+                if _, ok := err.(errors.UnknownPacketTypeError); !ok {
+                        return nil, err
+                }
+        }
+
+        return nil, io.EOF
+}
+
+// Push causes the Reader to start reading from a new io.Reader. When an EOF
+// error is seen from the new io.Reader, it is popped and the Reader continues
+// to read from the next most recent io.Reader. Push returns a StructuralError
+// if pushing the reader would exceed the maximum recursion level, otherwise it
+// returns nil.
+func (r *Reader) Push(reader io.Reader) (err error) {
+        if len(r.readers) >= maxReaders {
+                return errors.StructuralError("too many layers of packets")
+        }
+        r.readers = append(r.readers, reader)
+        return nil
+}
+
+// Unread causes the given Packet to be returned from the next call to Next.
+func (r *Reader) Unread(p Packet) {
+        r.q = append(r.q, p)
+}
+
+func NewReader(r io.Reader) *Reader {
+        return &Reader{
+                q:       nil,
+                readers: []io.Reader{r},
+        }
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/packet/signature.go b/vendor/golang.org/x/crypto/openpgp/packet/signature.go
new file mode 100644
index 0000000..6ce0cbe
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/packet/signature.go
@@ -0,0 +1,731 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+        "bytes"
+        "crypto"
+        "crypto/dsa"
+        "crypto/ecdsa"
+        "encoding/asn1"
+        "encoding/binary"
+        "hash"
+        "io"
+        "math/big"
+        "strconv"
+        "time"
+
+        "golang.org/x/crypto/openpgp/errors"
+        "golang.org/x/crypto/openpgp/s2k"
+)
+
+const (
+        // See RFC 4880, section 5.2.3.21 for details.
+        KeyFlagCertify = 1 << iota
+        KeyFlagSign
+        KeyFlagEncryptCommunications
+        KeyFlagEncryptStorage
+)
+
+// Signature represents a signature. See RFC 4880, section 5.2.
+type Signature struct {
+        SigType    SignatureType
+        PubKeyAlgo PublicKeyAlgorithm
+        Hash       crypto.Hash
+
+        // HashSuffix is extra data that is hashed in after the signed data.
+        HashSuffix []byte
+        // HashTag contains the first two bytes of the hash for fast rejection
+        // of bad signed data.
+        HashTag      [2]byte
+        CreationTime time.Time
+
+        RSASignature         parsedMPI
+        DSASigR, DSASigS     parsedMPI
+        ECDSASigR, ECDSASigS parsedMPI
+
+        // rawSubpackets contains the unparsed subpackets, in order.
+        rawSubpackets []outputSubpacket
+
+        // The following are optional so are nil when not included in the
+        // signature.
+
+        SigLifetimeSecs, KeyLifetimeSecs                        *uint32
+        PreferredSymmetric, PreferredHash, PreferredCompression []uint8
+        IssuerKeyId                                             *uint64
+        IsPrimaryId                                             *bool
+
+        // FlagsValid is set if any flags were given. See RFC 4880, section
+        // 5.2.3.21 for details.
+        FlagsValid                                                           bool
+        FlagCertify, FlagSign, FlagEncryptCommunications, FlagEncryptStorage bool
+
+        // RevocationReason is set if this signature has been revoked.
+        // See RFC 4880, section 5.2.3.23 for details.
+        RevocationReason     *uint8
+        RevocationReasonText string
+
+        // MDC is set if this signature has a feature packet that indicates
+        // support for MDC subpackets.
+        MDC bool
+
+        // EmbeddedSignature, if non-nil, is a signature of the parent key, by
+        // this key. This prevents an attacker from claiming another's signing
+        // subkey as their own.
+        EmbeddedSignature *Signature
+
+        outSubpackets []outputSubpacket
+}
+
+func (sig *Signature) parse(r io.Reader) (err error) {
+        // RFC 4880, section 5.2.3
+        var buf [5]byte
+        _, err = readFull(r, buf[:1])
+        if err != nil {
+                return
+        }
+        if buf[0] != 4 {
+                err = errors.UnsupportedError("signature packet version " + strconv.Itoa(int(buf[0])))
+                return
+        }
+
+        _, err = readFull(r, buf[:5])
+        if err != nil {
+                return
+        }
+        sig.SigType = SignatureType(buf[0])
+        sig.PubKeyAlgo = PublicKeyAlgorithm(buf[1])
+        switch sig.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly, PubKeyAlgoDSA, PubKeyAlgoECDSA:
+        default:
+                err = errors.UnsupportedError("public key algorithm " + strconv.Itoa(int(sig.PubKeyAlgo)))
+                return
+        }
+
+        var ok bool
+        sig.Hash, ok = s2k.HashIdToHash(buf[2])
+        if !ok {
+                return errors.UnsupportedError("hash function " + strconv.Itoa(int(buf[2])))
+        }
+
+        hashedSubpacketsLength := int(buf[3])<<8 | int(buf[4])
+        l := 6 + hashedSubpacketsLength
+        sig.HashSuffix = make([]byte, l+6)
+        sig.HashSuffix[0] = 4
+        copy(sig.HashSuffix[1:], buf[:5])
+        hashedSubpackets := sig.HashSuffix[6:l]
+        _, err = readFull(r, hashedSubpackets)
+        if err != nil {
+                return
+        }
+        // See RFC 4880, section 5.2.4
+        trailer := sig.HashSuffix[l:]
+        trailer[0] = 4
+        trailer[1] = 0xff
+        trailer[2] = uint8(l >> 24)
+        trailer[3] = uint8(l >> 16)
+        trailer[4] = uint8(l >> 8)
+        trailer[5] = uint8(l)
+
+        err = parseSignatureSubpackets(sig, hashedSubpackets, true)
+        if err != nil {
+                return
+        }
+
+        _, err = readFull(r, buf[:2])
+        if err != nil {
+                return
+        }
+        unhashedSubpacketsLength := int(buf[0])<<8 | int(buf[1])
+        unhashedSubpackets := make([]byte, unhashedSubpacketsLength)
+        _, err = readFull(r, unhashedSubpackets)
+        if err != nil {
+                return
+        }
+        err = parseSignatureSubpackets(sig, unhashedSubpackets, false)
+        if err != nil {
+                return
+        }
+
+        _, err = readFull(r, sig.HashTag[:2])
+        if err != nil {
+                return
+        }
+
+        switch sig.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
+                sig.RSASignature.bytes, sig.RSASignature.bitLength, err = readMPI(r)
+        case PubKeyAlgoDSA:
+                sig.DSASigR.bytes, sig.DSASigR.bitLength, err = readMPI(r)
+                if err == nil {
+                        sig.DSASigS.bytes, sig.DSASigS.bitLength, err = readMPI(r)
+                }
+        case PubKeyAlgoECDSA:
+                sig.ECDSASigR.bytes, sig.ECDSASigR.bitLength, err = readMPI(r)
+                if err == nil {
+                        sig.ECDSASigS.bytes, sig.ECDSASigS.bitLength, err = readMPI(r)
+                }
+        default:
+                panic("unreachable")
+        }
+        return
+}
+
+// parseSignatureSubpackets parses subpackets of the main signature packet. See
+// RFC 4880, section 5.2.3.1.
+func parseSignatureSubpackets(sig *Signature, subpackets []byte, isHashed bool) (err error) {
+        for len(subpackets) > 0 {
+                subpackets, err = parseSignatureSubpacket(sig, subpackets, isHashed)
+                if err != nil {
+                        return
+                }
+        }
+
+        if sig.CreationTime.IsZero() {
+                err = errors.StructuralError("no creation time in signature")
+        }
+
+        return
+}
+
+type signatureSubpacketType uint8
+
+const (
+        creationTimeSubpacket        signatureSubpacketType = 2
+        signatureExpirationSubpacket signatureSubpacketType = 3
+        keyExpirationSubpacket       signatureSubpacketType = 9
+        prefSymmetricAlgosSubpacket  signatureSubpacketType = 11
+        issuerSubpacket              signatureSubpacketType = 16
+        prefHashAlgosSubpacket       signatureSubpacketType = 21
+        prefCompressionSubpacket     signatureSubpacketType = 22
+        primaryUserIdSubpacket       signatureSubpacketType = 25
+        keyFlagsSubpacket            signatureSubpacketType = 27
+        reasonForRevocationSubpacket signatureSubpacketType = 29
+        featuresSubpacket            signatureSubpacketType = 30
+        embeddedSignatureSubpacket   signatureSubpacketType = 32
+)
+
+// parseSignatureSubpacket parses a single subpacket. len(subpacket) is >= 1.
+func parseSignatureSubpacket(sig *Signature, subpacket []byte, isHashed bool) (rest []byte, err error) {
+        // RFC 4880, section 5.2.3.1
+        var (
+                length     uint32
+                packetType signatureSubpacketType
+                isCritical bool
+        )
+        switch {
+        case subpacket[0] < 192:
+                length = uint32(subpacket[0])
+                subpacket = subpacket[1:]
+        case subpacket[0] < 255:
+                if len(subpacket) < 2 {
+                        goto Truncated
+                }
+                length = uint32(subpacket[0]-192)<<8 + uint32(subpacket[1]) + 192
+                subpacket = subpacket[2:]
+        default:
+                if len(subpacket) < 5 {
+                        goto Truncated
+                }
+                length = uint32(subpacket[1])<<24 |
+                        uint32(subpacket[2])<<16 |
+                        uint32(subpacket[3])<<8 |
+                        uint32(subpacket[4])
+                subpacket = subpacket[5:]
+        }
+        if length > uint32(len(subpacket)) {
+                goto Truncated
+        }
+        rest = subpacket[length:]
+        subpacket = subpacket[:length]
+        if len(subpacket) == 0 {
+                err = errors.StructuralError("zero length signature subpacket")
+                return
+        }
+        packetType = signatureSubpacketType(subpacket[0] & 0x7f)
+        isCritical = subpacket[0]&0x80 == 0x80
+        subpacket = subpacket[1:]
+        sig.rawSubpackets = append(sig.rawSubpackets, outputSubpacket{isHashed, packetType, isCritical, subpacket})
+        switch packetType {
+        case creationTimeSubpacket:
+                if !isHashed {
+                        err = errors.StructuralError("signature creation time in non-hashed area")
+                        return
+                }
+                if len(subpacket) != 4 {
+                        err = errors.StructuralError("signature creation time not four bytes")
+                        return
+                }
+                t := binary.BigEndian.Uint32(subpacket)
+                sig.CreationTime = time.Unix(int64(t), 0)
+        case signatureExpirationSubpacket:
+                // Signature expiration time, section 5.2.3.10
+                if !isHashed {
+                        return
+                }
+                if len(subpacket) != 4 {
+                        err = errors.StructuralError("expiration subpacket with bad length")
+                        return
+                }
+                sig.SigLifetimeSecs = new(uint32)
+                *sig.SigLifetimeSecs = binary.BigEndian.Uint32(subpacket)
+        case keyExpirationSubpacket:
+                // Key expiration time, section 5.2.3.6
+                if !isHashed {
+                        return
+                }
+                if len(subpacket) != 4 {
+                        err = errors.StructuralError("key expiration subpacket with bad length")
+                        return
+                }
+                sig.KeyLifetimeSecs = new(uint32)
+                *sig.KeyLifetimeSecs = binary.BigEndian.Uint32(subpacket)
+        case prefSymmetricAlgosSubpacket:
+                // Preferred symmetric algorithms, section 5.2.3.7
+                if !isHashed {
+                        return
+                }
+                sig.PreferredSymmetric = make([]byte, len(subpacket))
+                copy(sig.PreferredSymmetric, subpacket)
+        case issuerSubpacket:
+                // Issuer, section 5.2.3.5
+                if len(subpacket) != 8 {
+                        err = errors.StructuralError("issuer subpacket with bad length")
+                        return
+                }
+                sig.IssuerKeyId = new(uint64)
+                *sig.IssuerKeyId = binary.BigEndian.Uint64(subpacket)
+        case prefHashAlgosSubpacket:
+                // Preferred hash algorithms, section 5.2.3.8
+                if !isHashed {
+                        return
+                }
+                sig.PreferredHash = make([]byte, len(subpacket))
+                copy(sig.PreferredHash, subpacket)
+        case prefCompressionSubpacket:
+                // Preferred compression algorithms, section 5.2.3.9
+                if !isHashed {
+                        return
+                }
+                sig.PreferredCompression = make([]byte, len(subpacket))
+                copy(sig.PreferredCompression, subpacket)
+        case primaryUserIdSubpacket:
+                // Primary User ID, section 5.2.3.19
+                if !isHashed {
+                        return
+                }
+                if len(subpacket) != 1 {
+                        err = errors.StructuralError("primary user id subpacket with bad length")
+                        return
+                }
+                sig.IsPrimaryId = new(bool)
+                if subpacket[0] > 0 {
+                        *sig.IsPrimaryId = true
+                }
+        case keyFlagsSubpacket:
+                // Key flags, section 5.2.3.21
+                if !isHashed {
+                        return
+                }
+                if len(subpacket) == 0 {
+                        err = errors.StructuralError("empty key flags subpacket")
+                        return
+                }
+                sig.FlagsValid = true
+                if subpacket[0]&KeyFlagCertify != 0 {
+                        sig.FlagCertify = true
+                }
+                if subpacket[0]&KeyFlagSign != 0 {
+                        sig.FlagSign = true
+                }
+                if subpacket[0]&KeyFlagEncryptCommunications != 0 {
+                        sig.FlagEncryptCommunications = true
+                }
+                if subpacket[0]&KeyFlagEncryptStorage != 0 {
+                        sig.FlagEncryptStorage = true
+                }
+        case reasonForRevocationSubpacket:
+                // Reason For Revocation, section 5.2.3.23
+                if !isHashed {
+                        return
+                }
+                if len(subpacket) == 0 {
+                        err = errors.StructuralError("empty revocation reason subpacket")
+                        return
+                }
+                sig.RevocationReason = new(uint8)
+                *sig.RevocationReason = subpacket[0]
+                sig.RevocationReasonText = string(subpacket[1:])
+        case featuresSubpacket:
+                // Features subpacket, section 5.2.3.24 specifies a very general
+                // mechanism for OpenPGP implementations to signal support for new
+                // features. In practice, the subpacket is used exclusively to
+                // indicate support for MDC-protected encryption.
+                sig.MDC = len(subpacket) >= 1 && subpacket[0]&1 == 1
+        case embeddedSignatureSubpacket:
+                // Only usage is in signatures that cross-certify
+                // signing subkeys. section 5.2.3.26 describes the
+                // format, with its usage described in section 11.1
+                if sig.EmbeddedSignature != nil {
+                        err = errors.StructuralError("Cannot have multiple embedded signatures")
+                        return
+                }
+                sig.EmbeddedSignature = new(Signature)
+                // Embedded signatures are required to be v4 signatures see
+                // section 12.1. However, we only parse v4 signatures in this
+                // file anyway.
+                if err := sig.EmbeddedSignature.parse(bytes.NewBuffer(subpacket)); err != nil {
+                        return nil, err
+                }
+                if sigType := sig.EmbeddedSignature.SigType; sigType != SigTypePrimaryKeyBinding {
+                        return nil, errors.StructuralError("cross-signature has unexpected type " + strconv.Itoa(int(sigType)))
+                }
+        default:
+                if isCritical {
+                        err = errors.UnsupportedError("unknown critical signature subpacket type " + strconv.Itoa(int(packetType)))
+                        return
+                }
+        }
+        return
+
+Truncated:
+        err = errors.StructuralError("signature subpacket truncated")
+        return
+}
+
+// subpacketLengthLength returns the length, in bytes, of an encoded length value.
+func subpacketLengthLength(length int) int {
+        if length < 192 {
+                return 1
+        }
+        if length < 16320 {
+                return 2
+        }
+        return 5
+}
+
+// serializeSubpacketLength marshals the given length into to.
+func serializeSubpacketLength(to []byte, length int) int {
+        // RFC 4880, Section 4.2.2.
+        if length < 192 {
+                to[0] = byte(length)
+                return 1
+        }
+        if length < 16320 {
+                length -= 192
+                to[0] = byte((length >> 8) + 192)
+                to[1] = byte(length)
+                return 2
+        }
+        to[0] = 255
+        to[1] = byte(length >> 24)
+        to[2] = byte(length >> 16)
+        to[3] = byte(length >> 8)
+        to[4] = byte(length)
+        return 5
+}
+
+// subpacketsLength returns the serialized length, in bytes, of the given
+// subpackets.
+func subpacketsLength(subpackets []outputSubpacket, hashed bool) (length int) {
+        for _, subpacket := range subpackets {
+                if subpacket.hashed == hashed {
+                        length += subpacketLengthLength(len(subpacket.contents) + 1)
+                        length += 1 // type byte
+                        length += len(subpacket.contents)
+                }
+        }
+        return
+}
+
+// serializeSubpackets marshals the given subpackets into to.
+func serializeSubpackets(to []byte, subpackets []outputSubpacket, hashed bool) {
+        for _, subpacket := range subpackets {
+                if subpacket.hashed == hashed {
+                        n := serializeSubpacketLength(to, len(subpacket.contents)+1)
+                        to[n] = byte(subpacket.subpacketType)
+                        to = to[1+n:]
+                        n = copy(to, subpacket.contents)
+                        to = to[n:]
+                }
+        }
+        return
+}
+
+// KeyExpired returns whether sig is a self-signature of a key that has
+// expired.
+func (sig *Signature) KeyExpired(currentTime time.Time) bool {
+        if sig.KeyLifetimeSecs == nil {
+                return false
+        }
+        expiry := sig.CreationTime.Add(time.Duration(*sig.KeyLifetimeSecs) * time.Second)
+        return currentTime.After(expiry)
+}
+
+// buildHashSuffix constructs the HashSuffix member of sig in preparation for signing.
+func (sig *Signature) buildHashSuffix() (err error) {
+        hashedSubpacketsLen := subpacketsLength(sig.outSubpackets, true)
+
+        var ok bool
+        l := 6 + hashedSubpacketsLen
+        sig.HashSuffix = make([]byte, l+6)
+        sig.HashSuffix[0] = 4
+        sig.HashSuffix[1] = uint8(sig.SigType)
+        sig.HashSuffix[2] = uint8(sig.PubKeyAlgo)
+        sig.HashSuffix[3], ok = s2k.HashToHashId(sig.Hash)
+        if !ok {
+                sig.HashSuffix = nil
+                return errors.InvalidArgumentError("hash cannot be represented in OpenPGP: " + strconv.Itoa(int(sig.Hash)))
+        }
+        sig.HashSuffix[4] = byte(hashedSubpacketsLen >> 8)
+        sig.HashSuffix[5] = byte(hashedSubpacketsLen)
+        serializeSubpackets(sig.HashSuffix[6:l], sig.outSubpackets, true)
+        trailer := sig.HashSuffix[l:]
+        trailer[0] = 4
+        trailer[1] = 0xff
+        trailer[2] = byte(l >> 24)
+        trailer[3] = byte(l >> 16)
+        trailer[4] = byte(l >> 8)
+        trailer[5] = byte(l)
+        return
+}
+
+func (sig *Signature) signPrepareHash(h hash.Hash) (digest []byte, err error) {
+        err = sig.buildHashSuffix()
+        if err != nil {
+                return
+        }
+
+        h.Write(sig.HashSuffix)
+        digest = h.Sum(nil)
+        copy(sig.HashTag[:], digest)
+        return
+}
+
+// Sign signs a message with a private key. The hash, h, must contain
+// the hash of the message to be signed and will be mutated by this function.
+// On success, the signature is stored in sig. Call Serialize to write it out.
+// If config is nil, sensible defaults will be used.
+func (sig *Signature) Sign(h hash.Hash, priv *PrivateKey, config *Config) (err error) {
+        sig.outSubpackets = sig.buildSubpackets()
+        digest, err := sig.signPrepareHash(h)
+        if err != nil {
+                return
+        }
+
+        switch priv.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
+                // supports both *rsa.PrivateKey and crypto.Signer
+                sig.RSASignature.bytes, err = priv.PrivateKey.(crypto.Signer).Sign(config.Random(), digest, sig.Hash)
+                sig.RSASignature.bitLength = uint16(8 * len(sig.RSASignature.bytes))
+        case PubKeyAlgoDSA:
+                dsaPriv := priv.PrivateKey.(*dsa.PrivateKey)
+
+                // Need to truncate hashBytes to match FIPS 186-3 section 4.6.
+                subgroupSize := (dsaPriv.Q.BitLen() + 7) / 8
+                if len(digest) > subgroupSize {
+                        digest = digest[:subgroupSize]
+                }
+                r, s, err := dsa.Sign(config.Random(), dsaPriv, digest)
+                if err == nil {
+                        sig.DSASigR.bytes = r.Bytes()
+                        sig.DSASigR.bitLength = uint16(8 * len(sig.DSASigR.bytes))
+                        sig.DSASigS.bytes = s.Bytes()
+                        sig.DSASigS.bitLength = uint16(8 * len(sig.DSASigS.bytes))
+                }
+        case PubKeyAlgoECDSA:
+                var r, s *big.Int
+                if pk, ok := priv.PrivateKey.(*ecdsa.PrivateKey); ok {
+                        // direct support, avoid asn1 wrapping/unwrapping
+                        r, s, err = ecdsa.Sign(config.Random(), pk, digest)
+                } else {
+                        var b []byte
+                        b, err = priv.PrivateKey.(crypto.Signer).Sign(config.Random(), digest, nil)
+                        if err == nil {
+                                r, s, err = unwrapECDSASig(b)
+                        }
+                }
+                if err == nil {
+                        sig.ECDSASigR = fromBig(r)
+                        sig.ECDSASigS = fromBig(s)
+                }
+        default:
+                err = errors.UnsupportedError("public key algorithm: " + strconv.Itoa(int(sig.PubKeyAlgo)))
+        }
+
+        return
+}
+
+// unwrapECDSASig parses the two integer components of an ASN.1-encoded ECDSA
+// signature.
+func unwrapECDSASig(b []byte) (r, s *big.Int, err error) {
+        var ecsdaSig struct {
+                R, S *big.Int
+        }
+        _, err = asn1.Unmarshal(b, &ecsdaSig)
+        if err != nil {
+                return
+        }
+        return ecsdaSig.R, ecsdaSig.S, nil
+}
+
+// SignUserId computes a signature from priv, asserting that pub is a valid
+// key for the identity id.  On success, the signature is stored in sig. Call
+// Serialize to write it out.
+// If config is nil, sensible defaults will be used.
+func (sig *Signature) SignUserId(id string, pub *PublicKey, priv *PrivateKey, config *Config) error {
+        h, err := userIdSignatureHash(id, pub, sig.Hash)
+        if err != nil {
+                return err
+        }
+        return sig.Sign(h, priv, config)
+}
+
+// SignKey computes a signature from priv, asserting that pub is a subkey. On
+// success, the signature is stored in sig. Call Serialize to write it out.
+// If config is nil, sensible defaults will be used.
+func (sig *Signature) SignKey(pub *PublicKey, priv *PrivateKey, config *Config) error {
+        h, err := keySignatureHash(&priv.PublicKey, pub, sig.Hash)
+        if err != nil {
+                return err
+        }
+        return sig.Sign(h, priv, config)
+}
+
+// Serialize marshals sig to w. Sign, SignUserId or SignKey must have been
+// called first.
+func (sig *Signature) Serialize(w io.Writer) (err error) {
+        if len(sig.outSubpackets) == 0 {
+                sig.outSubpackets = sig.rawSubpackets
+        }
+        if sig.RSASignature.bytes == nil && sig.DSASigR.bytes == nil && sig.ECDSASigR.bytes == nil {
+                return errors.InvalidArgumentError("Signature: need to call Sign, SignUserId or SignKey before Serialize")
+        }
+
+        sigLength := 0
+        switch sig.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
+                sigLength = 2 + len(sig.RSASignature.bytes)
+        case PubKeyAlgoDSA:
+                sigLength = 2 + len(sig.DSASigR.bytes)
+                sigLength += 2 + len(sig.DSASigS.bytes)
+        case PubKeyAlgoECDSA:
+                sigLength = 2 + len(sig.ECDSASigR.bytes)
+                sigLength += 2 + len(sig.ECDSASigS.bytes)
+        default:
+                panic("impossible")
+        }
+
+        unhashedSubpacketsLen := subpacketsLength(sig.outSubpackets, false)
+        length := len(sig.HashSuffix) - 6 /* trailer not included */ +
+                2 /* length of unhashed subpackets */ + unhashedSubpacketsLen +
+                2 /* hash tag */ + sigLength
+        err = serializeHeader(w, packetTypeSignature, length)
+        if err != nil {
+                return
+        }
+
+        _, err = w.Write(sig.HashSuffix[:len(sig.HashSuffix)-6])
+        if err != nil {
+                return
+        }
+
+        unhashedSubpackets := make([]byte, 2+unhashedSubpacketsLen)
+        unhashedSubpackets[0] = byte(unhashedSubpacketsLen >> 8)
+        unhashedSubpackets[1] = byte(unhashedSubpacketsLen)
+        serializeSubpackets(unhashedSubpackets[2:], sig.outSubpackets, false)
+
+        _, err = w.Write(unhashedSubpackets)
+        if err != nil {
+                return
+        }
+        _, err = w.Write(sig.HashTag[:])
+        if err != nil {
+                return
+        }
+
+        switch sig.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
+                err = writeMPIs(w, sig.RSASignature)
+        case PubKeyAlgoDSA:
+                err = writeMPIs(w, sig.DSASigR, sig.DSASigS)
+        case PubKeyAlgoECDSA:
+                err = writeMPIs(w, sig.ECDSASigR, sig.ECDSASigS)
+        default:
+                panic("impossible")
+        }
+        return
+}
+
+// outputSubpacket represents a subpacket to be marshaled.
+type outputSubpacket struct {
+        hashed        bool // true if this subpacket is in the hashed area.
+        subpacketType signatureSubpacketType
+        isCritical    bool
+        contents      []byte
+}
+
+func (sig *Signature) buildSubpackets() (subpackets []outputSubpacket) {
+        creationTime := make([]byte, 4)
+        binary.BigEndian.PutUint32(creationTime, uint32(sig.CreationTime.Unix()))
+        subpackets = append(subpackets, outputSubpacket{true, creationTimeSubpacket, false, creationTime})
+
+        if sig.IssuerKeyId != nil {
+                keyId := make([]byte, 8)
+                binary.BigEndian.PutUint64(keyId, *sig.IssuerKeyId)
+                subpackets = append(subpackets, outputSubpacket{true, issuerSubpacket, false, keyId})
+        }
+
+        if sig.SigLifetimeSecs != nil && *sig.SigLifetimeSecs != 0 {
+                sigLifetime := make([]byte, 4)
+                binary.BigEndian.PutUint32(sigLifetime, *sig.SigLifetimeSecs)
+                subpackets = append(subpackets, outputSubpacket{true, signatureExpirationSubpacket, true, sigLifetime})
+        }
+
+        // Key flags may only appear in self-signatures or certification signatures.
+
+        if sig.FlagsValid {
+                var flags byte
+                if sig.FlagCertify {
+                        flags |= KeyFlagCertify
+                }
+                if sig.FlagSign {
+                        flags |= KeyFlagSign
+                }
+                if sig.FlagEncryptCommunications {
+                        flags |= KeyFlagEncryptCommunications
+                }
+                if sig.FlagEncryptStorage {
+                        flags |= KeyFlagEncryptStorage
+                }
+                subpackets = append(subpackets, outputSubpacket{true, keyFlagsSubpacket, false, []byte{flags}})
+        }
+
+        // The following subpackets may only appear in self-signatures
+
+        if sig.KeyLifetimeSecs != nil && *sig.KeyLifetimeSecs != 0 {
+                keyLifetime := make([]byte, 4)
+                binary.BigEndian.PutUint32(keyLifetime, *sig.KeyLifetimeSecs)
+                subpackets = append(subpackets, outputSubpacket{true, keyExpirationSubpacket, true, keyLifetime})
+        }
+
+        if sig.IsPrimaryId != nil && *sig.IsPrimaryId {
+                subpackets = append(subpackets, outputSubpacket{true, primaryUserIdSubpacket, false, []byte{1}})
+        }
+
+        if len(sig.PreferredSymmetric) > 0 {
+                subpackets = append(subpackets, outputSubpacket{true, prefSymmetricAlgosSubpacket, false, sig.PreferredSymmetric})
+        }
+
+        if len(sig.PreferredHash) > 0 {
+                subpackets = append(subpackets, outputSubpacket{true, prefHashAlgosSubpacket, false, sig.PreferredHash})
+        }
+
+        if len(sig.PreferredCompression) > 0 {
+                subpackets = append(subpackets, outputSubpacket{true, prefCompressionSubpacket, false, sig.PreferredCompression})
+        }
+
+        return
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/packet/signature_v3.go b/vendor/golang.org/x/crypto/openpgp/packet/signature_v3.go
new file mode 100644
index 0000000..6edff88
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/packet/signature_v3.go
@@ -0,0 +1,146 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+        "crypto"
+        "encoding/binary"
+        "fmt"
+        "io"
+        "strconv"
+        "time"
+
+        "golang.org/x/crypto/openpgp/errors"
+        "golang.org/x/crypto/openpgp/s2k"
+)
+
+// SignatureV3 represents older version 3 signatures. These signatures are less secure
+// than version 4 and should not be used to create new signatures. They are included
+// here for backwards compatibility to read and validate with older key material.
+// See RFC 4880, section 5.2.2.
+type SignatureV3 struct {
+        SigType      SignatureType
+        CreationTime time.Time
+        IssuerKeyId  uint64
+        PubKeyAlgo   PublicKeyAlgorithm
+        Hash         crypto.Hash
+        HashTag      [2]byte
+
+        RSASignature     parsedMPI
+        DSASigR, DSASigS parsedMPI
+}
+
+func (sig *SignatureV3) parse(r io.Reader) (err error) {
+        // RFC 4880, section 5.2.2
+        var buf [8]byte
+        if _, err = readFull(r, buf[:1]); err != nil {
+                return
+        }
+        if buf[0] < 2 || buf[0] > 3 {
+                err = errors.UnsupportedError("signature packet version " + strconv.Itoa(int(buf[0])))
+                return
+        }
+        if _, err = readFull(r, buf[:1]); err != nil {
+                return
+        }
+        if buf[0] != 5 {
+                err = errors.UnsupportedError(
+                        "invalid hashed material length " + strconv.Itoa(int(buf[0])))
+                return
+        }
+
+        // Read hashed material: signature type + creation time
+        if _, err = readFull(r, buf[:5]); err != nil {
+                return
+        }
+        sig.SigType = SignatureType(buf[0])
+        t := binary.BigEndian.Uint32(buf[1:5])
+        sig.CreationTime = time.Unix(int64(t), 0)
+
+        // Eight-octet Key ID of signer.
+        if _, err = readFull(r, buf[:8]); err != nil {
+                return
+        }
+        sig.IssuerKeyId = binary.BigEndian.Uint64(buf[:])
+
+        // Public-key and hash algorithm
+        if _, err = readFull(r, buf[:2]); err != nil {
+                return
+        }
+        sig.PubKeyAlgo = PublicKeyAlgorithm(buf[0])
+        switch sig.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly, PubKeyAlgoDSA:
+        default:
+                err = errors.UnsupportedError("public key algorithm " + strconv.Itoa(int(sig.PubKeyAlgo)))
+                return
+        }
+        var ok bool
+        if sig.Hash, ok = s2k.HashIdToHash(buf[1]); !ok {
+                return errors.UnsupportedError("hash function " + strconv.Itoa(int(buf[2])))
+        }
+
+        // Two-octet field holding left 16 bits of signed hash value.
+        if _, err = readFull(r, sig.HashTag[:2]); err != nil {
+                return
+        }
+
+        switch sig.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
+                sig.RSASignature.bytes, sig.RSASignature.bitLength, err = readMPI(r)
+        case PubKeyAlgoDSA:
+                if sig.DSASigR.bytes, sig.DSASigR.bitLength, err = readMPI(r); err != nil {
+                        return
+                }
+                sig.DSASigS.bytes, sig.DSASigS.bitLength, err = readMPI(r)
+        default:
+                panic("unreachable")
+        }
+        return
+}
+
+// Serialize marshals sig to w. Sign, SignUserId or SignKey must have been
+// called first.
+func (sig *SignatureV3) Serialize(w io.Writer) (err error) {
+        buf := make([]byte, 8)
+
+        // Write the sig type and creation time
+        buf[0] = byte(sig.SigType)
+        binary.BigEndian.PutUint32(buf[1:5], uint32(sig.CreationTime.Unix()))
+        if _, err = w.Write(buf[:5]); err != nil {
+                return
+        }
+
+        // Write the issuer long key ID
+        binary.BigEndian.PutUint64(buf[:8], sig.IssuerKeyId)
+        if _, err = w.Write(buf[:8]); err != nil {
+                return
+        }
+
+        // Write public key algorithm, hash ID, and hash value
+        buf[0] = byte(sig.PubKeyAlgo)
+        hashId, ok := s2k.HashToHashId(sig.Hash)
+        if !ok {
+                return errors.UnsupportedError(fmt.Sprintf("hash function %v", sig.Hash))
+        }
+        buf[1] = hashId
+        copy(buf[2:4], sig.HashTag[:])
+        if _, err = w.Write(buf[:4]); err != nil {
+                return
+        }
+
+        if sig.RSASignature.bytes == nil && sig.DSASigR.bytes == nil {
+                return errors.InvalidArgumentError("Signature: need to call Sign, SignUserId or SignKey before Serialize")
+        }
+
+        switch sig.PubKeyAlgo {
+        case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
+                err = writeMPIs(w, sig.RSASignature)
+        case PubKeyAlgoDSA:
+                err = writeMPIs(w, sig.DSASigR, sig.DSASigS)
+        default:
+                panic("impossible")
+        }
+        return
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/packet/symmetric_key_encrypted.go b/vendor/golang.org/x/crypto/openpgp/packet/symmetric_key_encrypted.go
new file mode 100644
index 0000000..744c2d2
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/packet/symmetric_key_encrypted.go
@@ -0,0 +1,155 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+        "bytes"
+        "crypto/cipher"
+        "io"
+        "strconv"
+
+        "golang.org/x/crypto/openpgp/errors"
+        "golang.org/x/crypto/openpgp/s2k"
+)
+
+// This is the largest session key that we'll support. Since no 512-bit cipher
+// has even been seriously used, this is comfortably large.
+const maxSessionKeySizeInBytes = 64
+
+// SymmetricKeyEncrypted represents a passphrase protected session key. See RFC
+// 4880, section 5.3.
+type SymmetricKeyEncrypted struct {
+        CipherFunc   CipherFunction
+        s2k          func(out, in []byte)
+        encryptedKey []byte
+}
+
+const symmetricKeyEncryptedVersion = 4
+
+func (ske *SymmetricKeyEncrypted) parse(r io.Reader) error {
+        // RFC 4880, section 5.3.
+        var buf [2]byte
+        if _, err := readFull(r, buf[:]); err != nil {
+                return err
+        }
+        if buf[0] != symmetricKeyEncryptedVersion {
+                return errors.UnsupportedError("SymmetricKeyEncrypted version")
+        }
+        ske.CipherFunc = CipherFunction(buf[1])
+
+        if ske.CipherFunc.KeySize() == 0 {
+                return errors.UnsupportedError("unknown cipher: " + strconv.Itoa(int(buf[1])))
+        }
+
+        var err error
+        ske.s2k, err = s2k.Parse(r)
+        if err != nil {
+                return err
+        }
+
+        encryptedKey := make([]byte, maxSessionKeySizeInBytes)
+        // The session key may follow. We just have to try and read to find
+        // out. If it exists then we limit it to maxSessionKeySizeInBytes.
+        n, err := readFull(r, encryptedKey)
+        if err != nil && err != io.ErrUnexpectedEOF {
+                return err
+        }
+
+        if n != 0 {
+                if n == maxSessionKeySizeInBytes {
+                        return errors.UnsupportedError("oversized encrypted session key")
+                }
+                ske.encryptedKey = encryptedKey[:n]
+        }
+
+        return nil
+}
+
+// Decrypt attempts to decrypt an encrypted session key and returns the key and
+// the cipher to use when decrypting a subsequent Symmetrically Encrypted Data
+// packet.
+func (ske *SymmetricKeyEncrypted) Decrypt(passphrase []byte) ([]byte, CipherFunction, error) {
+        key := make([]byte, ske.CipherFunc.KeySize())
+        ske.s2k(key, passphrase)
+
+        if len(ske.encryptedKey) == 0 {
+                return key, ske.CipherFunc, nil
+        }
+
+        // the IV is all zeros
+        iv := make([]byte, ske.CipherFunc.blockSize())
+        c := cipher.NewCFBDecrypter(ske.CipherFunc.new(key), iv)
+        plaintextKey := make([]byte, len(ske.encryptedKey))
+        c.XORKeyStream(plaintextKey, ske.encryptedKey)
+        cipherFunc := CipherFunction(plaintextKey[0])
+        if cipherFunc.blockSize() == 0 {
+                return nil, ske.CipherFunc, errors.UnsupportedError("unknown cipher: " + strconv.Itoa(int(cipherFunc)))
+        }
+        plaintextKey = plaintextKey[1:]
+        if l, cipherKeySize := len(plaintextKey), cipherFunc.KeySize(); l != cipherFunc.KeySize() {
+                return nil, cipherFunc, errors.StructuralError("length of decrypted key (" + strconv.Itoa(l) + ") " +
+                        "not equal to cipher keysize (" + strconv.Itoa(cipherKeySize) + ")")
+        }
+        return plaintextKey, cipherFunc, nil
+}
+
+// SerializeSymmetricKeyEncrypted serializes a symmetric key packet to w. The
+// packet contains a random session key, encrypted by a key derived from the
+// given passphrase. The session key is returned and must be passed to
+// SerializeSymmetricallyEncrypted.
+// If config is nil, sensible defaults will be used.
+func SerializeSymmetricKeyEncrypted(w io.Writer, passphrase []byte, config *Config) (key []byte, err error) {
+        cipherFunc := config.Cipher()
+        keySize := cipherFunc.KeySize()
+        if keySize == 0 {
+                return nil, errors.UnsupportedError("unknown cipher: " + strconv.Itoa(int(cipherFunc)))
+        }
+
+        s2kBuf := new(bytes.Buffer)
+        keyEncryptingKey := make([]byte, keySize)
+        // s2k.Serialize salts and stretches the passphrase, and writes the
+        // resulting key to keyEncryptingKey and the s2k descriptor to s2kBuf.
+        err = s2k.Serialize(s2kBuf, keyEncryptingKey, config.Random(), passphrase, &s2k.Config{Hash: config.Hash(), S2KCount: config.PasswordHashIterations()})
+        if err != nil {
+                return
+        }
+        s2kBytes := s2kBuf.Bytes()
+
+        packetLength := 2 /* header */ + len(s2kBytes) + 1 /* cipher type */ + keySize
+        err = serializeHeader(w, packetTypeSymmetricKeyEncrypted, packetLength)
+        if err != nil {
+                return
+        }
+
+        var buf [2]byte
+        buf[0] = symmetricKeyEncryptedVersion
+        buf[1] = byte(cipherFunc)
+        _, err = w.Write(buf[:])
+        if err != nil {
+                return
+        }
+        _, err = w.Write(s2kBytes)
+        if err != nil {
+                return
+        }
+
+        sessionKey := make([]byte, keySize)
+        _, err = io.ReadFull(config.Random(), sessionKey)
+        if err != nil {
+                return
+        }
+        iv := make([]byte, cipherFunc.blockSize())
+        c := cipher.NewCFBEncrypter(cipherFunc.new(keyEncryptingKey), iv)
+        encryptedCipherAndKey := make([]byte, keySize+1)
+        c.XORKeyStream(encryptedCipherAndKey, buf[1:])
+        c.XORKeyStream(encryptedCipherAndKey[1:], sessionKey)
+        _, err = w.Write(encryptedCipherAndKey)
+        if err != nil {
+                return
+        }
+
+        key = sessionKey
+        return
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/packet/symmetrically_encrypted.go b/vendor/golang.org/x/crypto/openpgp/packet/symmetrically_encrypted.go
new file mode 100644
index 0000000..6126030
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/packet/symmetrically_encrypted.go
@@ -0,0 +1,290 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+        "crypto/cipher"
+        "crypto/sha1"
+        "crypto/subtle"
+        "golang.org/x/crypto/openpgp/errors"
+        "hash"
+        "io"
+        "strconv"
+)
+
+// SymmetricallyEncrypted represents a symmetrically encrypted byte string. The
+// encrypted contents will consist of more OpenPGP packets. See RFC 4880,
+// sections 5.7 and 5.13.
+type SymmetricallyEncrypted struct {
+        MDC      bool // true iff this is a type 18 packet and thus has an embedded MAC.
+        contents io.Reader
+        prefix   []byte
+}
+
+const symmetricallyEncryptedVersion = 1
+
+func (se *SymmetricallyEncrypted) parse(r io.Reader) error {
+        if se.MDC {
+                // See RFC 4880, section 5.13.
+                var buf [1]byte
+                _, err := readFull(r, buf[:])
+                if err != nil {
+                        return err
+                }
+                if buf[0] != symmetricallyEncryptedVersion {
+                        return errors.UnsupportedError("unknown SymmetricallyEncrypted version")
+                }
+        }
+        se.contents = r
+        return nil
+}
+
+// Decrypt returns a ReadCloser, from which the decrypted contents of the
+// packet can be read. An incorrect key can, with high probability, be detected
+// immediately and this will result in a KeyIncorrect error being returned.
+func (se *SymmetricallyEncrypted) Decrypt(c CipherFunction, key []byte) (io.ReadCloser, error) {
+        keySize := c.KeySize()
+        if keySize == 0 {
+                return nil, errors.UnsupportedError("unknown cipher: " + strconv.Itoa(int(c)))
+        }
+        if len(key) != keySize {
+                return nil, errors.InvalidArgumentError("SymmetricallyEncrypted: incorrect key length")
+        }
+
+        if se.prefix == nil {
+                se.prefix = make([]byte, c.blockSize()+2)
+                _, err := readFull(se.contents, se.prefix)
+                if err != nil {
+                        return nil, err
+                }
+        } else if len(se.prefix) != c.blockSize()+2 {
+                return nil, errors.InvalidArgumentError("can't try ciphers with different block lengths")
+        }
+
+        ocfbResync := OCFBResync
+        if se.MDC {
+                // MDC packets use a different form of OCFB mode.
+                ocfbResync = OCFBNoResync
+        }
+
+        s := NewOCFBDecrypter(c.new(key), se.prefix, ocfbResync)
+        if s == nil {
+                return nil, errors.ErrKeyIncorrect
+        }
+
+        plaintext := cipher.StreamReader{S: s, R: se.contents}
+
+        if se.MDC {
+                // MDC packets have an embedded hash that we need to check.
+                h := sha1.New()
+                h.Write(se.prefix)
+                return &seMDCReader{in: plaintext, h: h}, nil
+        }
+
+        // Otherwise, we just need to wrap plaintext so that it's a valid ReadCloser.
+        return seReader{plaintext}, nil
+}
+
+// seReader wraps an io.Reader with a no-op Close method.
+type seReader struct {
+        in io.Reader
+}
+
+func (ser seReader) Read(buf []byte) (int, error) {
+        return ser.in.Read(buf)
+}
+
+func (ser seReader) Close() error {
+        return nil
+}
+
+const mdcTrailerSize = 1 /* tag byte */ + 1 /* length byte */ + sha1.Size
+
+// An seMDCReader wraps an io.Reader, maintains a running hash and keeps hold
+// of the most recent 22 bytes (mdcTrailerSize). Upon EOF, those bytes form an
+// MDC packet containing a hash of the previous contents which is checked
+// against the running hash. See RFC 4880, section 5.13.
+type seMDCReader struct {
+        in          io.Reader
+        h           hash.Hash
+        trailer     [mdcTrailerSize]byte
+        scratch     [mdcTrailerSize]byte
+        trailerUsed int
+        error       bool
+        eof         bool
+}
+
+func (ser *seMDCReader) Read(buf []byte) (n int, err error) {
+        if ser.error {
+                err = io.ErrUnexpectedEOF
+                return
+        }
+        if ser.eof {
+                err = io.EOF
+                return
+        }
+
+        // If we haven't yet filled the trailer buffer then we must do that
+        // first.
+        for ser.trailerUsed < mdcTrailerSize {
+                n, err = ser.in.Read(ser.trailer[ser.trailerUsed:])
+                ser.trailerUsed += n
+                if err == io.EOF {
+                        if ser.trailerUsed != mdcTrailerSize {
+                                n = 0
+                                err = io.ErrUnexpectedEOF
+                                ser.error = true
+                                return
+                        }
+                        ser.eof = true
+                        n = 0
+                        return
+                }
+
+                if err != nil {
+                        n = 0
+                        return
+                }
+        }
+
+        // If it's a short read then we read into a temporary buffer and shift
+        // the data into the caller's buffer.
+        if len(buf) <= mdcTrailerSize {
+                n, err = readFull(ser.in, ser.scratch[:len(buf)])
+                copy(buf, ser.trailer[:n])
+                ser.h.Write(buf[:n])
+                copy(ser.trailer[:], ser.trailer[n:])
+                copy(ser.trailer[mdcTrailerSize-n:], ser.scratch[:])
+                if n < len(buf) {
+                        ser.eof = true
+                        err = io.EOF
+                }
+                return
+        }
+
+        n, err = ser.in.Read(buf[mdcTrailerSize:])
+        copy(buf, ser.trailer[:])
+        ser.h.Write(buf[:n])
+        copy(ser.trailer[:], buf[n:])
+
+        if err == io.EOF {
+                ser.eof = true
+        }
+        return
+}
+
+// This is a new-format packet tag byte for a type 19 (MDC) packet.
+const mdcPacketTagByte = byte(0x80) | 0x40 | 19
+
+func (ser *seMDCReader) Close() error {
+        if ser.error {
+                return errors.SignatureError("error during reading")
+        }
+
+        for !ser.eof {
+                // We haven't seen EOF so we need to read to the end
+                var buf [1024]byte
+                _, err := ser.Read(buf[:])
+                if err == io.EOF {
+                        break
+                }
+                if err != nil {
+                        return errors.SignatureError("error during reading")
+                }
+        }
+
+        if ser.trailer[0] != mdcPacketTagByte || ser.trailer[1] != sha1.Size {
+                return errors.SignatureError("MDC packet not found")
+        }
+        ser.h.Write(ser.trailer[:2])
+
+        final := ser.h.Sum(nil)
+        if subtle.ConstantTimeCompare(final, ser.trailer[2:]) != 1 {
+                return errors.SignatureError("hash mismatch")
+        }
+        return nil
+}
+
+// An seMDCWriter writes through to an io.WriteCloser while maintains a running
+// hash of the data written. On close, it emits an MDC packet containing the
+// running hash.
+type seMDCWriter struct {
+        w io.WriteCloser
+        h hash.Hash
+}
+
+func (w *seMDCWriter) Write(buf []byte) (n int, err error) {
+        w.h.Write(buf)
+        return w.w.Write(buf)
+}
+
+func (w *seMDCWriter) Close() (err error) {
+        var buf [mdcTrailerSize]byte
+
+        buf[0] = mdcPacketTagByte
+        buf[1] = sha1.Size
+        w.h.Write(buf[:2])
+        digest := w.h.Sum(nil)
+        copy(buf[2:], digest)
+
+        _, err = w.w.Write(buf[:])
+        if err != nil {
+                return
+        }
+        return w.w.Close()
+}
+
+// noOpCloser is like an ioutil.NopCloser, but for an io.Writer.
+type noOpCloser struct {
+        w io.Writer
+}
+
+func (c noOpCloser) Write(data []byte) (n int, err error) {
+        return c.w.Write(data)
+}
+
+func (c noOpCloser) Close() error {
+        return nil
+}
+
+// SerializeSymmetricallyEncrypted serializes a symmetrically encrypted packet
+// to w and returns a WriteCloser to which the to-be-encrypted packets can be
+// written.
+// If config is nil, sensible defaults will be used.
+func SerializeSymmetricallyEncrypted(w io.Writer, c CipherFunction, key []byte, config *Config) (contents io.WriteCloser, err error) {
+        if c.KeySize() != len(key) {
+                return nil, errors.InvalidArgumentError("SymmetricallyEncrypted.Serialize: bad key length")
+        }
+        writeCloser := noOpCloser{w}
+        ciphertext, err := serializeStreamHeader(writeCloser, packetTypeSymmetricallyEncryptedMDC)
+        if err != nil {
+                return
+        }
+
+        _, err = ciphertext.Write([]byte{symmetricallyEncryptedVersion})
+        if err != nil {
+                return
+        }
+
+        block := c.new(key)
+        blockSize := block.BlockSize()
+        iv := make([]byte, blockSize)
+        _, err = config.Random().Read(iv)
+        if err != nil {
+                return
+        }
+        s, prefix := NewOCFBEncrypter(block, iv, OCFBNoResync)
+        _, err = ciphertext.Write(prefix)
+        if err != nil {
+                return
+        }
+        plaintext := cipher.StreamWriter{S: s, W: ciphertext}
+
+        h := sha1.New()
+        h.Write(iv)
+        h.Write(iv[blockSize-2:])
+        contents = &seMDCWriter{w: plaintext, h: h}
+        return
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/packet/userattribute.go b/vendor/golang.org/x/crypto/openpgp/packet/userattribute.go
new file mode 100644
index 0000000..96a2b38
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/packet/userattribute.go
@@ -0,0 +1,91 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+        "bytes"
+        "image"
+        "image/jpeg"
+        "io"
+        "io/ioutil"
+)
+
+const UserAttrImageSubpacket = 1
+
+// UserAttribute is capable of storing other types of data about a user
+// beyond name, email and a text comment. In practice, user attributes are typically used
+// to store a signed thumbnail photo JPEG image of the user.
+// See RFC 4880, section 5.12.
+type UserAttribute struct {
+        Contents []*OpaqueSubpacket
+}
+
+// NewUserAttributePhoto creates a user attribute packet
+// containing the given images.
+func NewUserAttributePhoto(photos ...image.Image) (uat *UserAttribute, err error) {
+        uat = new(UserAttribute)
+        for _, photo := range photos {
+                var buf bytes.Buffer
+                // RFC 4880, Section 5.12.1.
+                data := []byte{
+                        0x10, 0x00, // Little-endian image header length (16 bytes)
+                        0x01,       // Image header version 1
+                        0x01,       // JPEG
+                        0, 0, 0, 0, // 12 reserved octets, must be all zero.
+                        0, 0, 0, 0,
+                        0, 0, 0, 0}
+                if _, err = buf.Write(data); err != nil {
+                        return
+                }
+                if err = jpeg.Encode(&buf, photo, nil); err != nil {
+                        return
+                }
+                uat.Contents = append(uat.Contents, &OpaqueSubpacket{
+                        SubType:  UserAttrImageSubpacket,
+                        Contents: buf.Bytes()})
+        }
+        return
+}
+
+// NewUserAttribute creates a new user attribute packet containing the given subpackets.
+func NewUserAttribute(contents ...*OpaqueSubpacket) *UserAttribute {
+        return &UserAttribute{Contents: contents}
+}
+
+func (uat *UserAttribute) parse(r io.Reader) (err error) {
+        // RFC 4880, section 5.13
+        b, err := ioutil.ReadAll(r)
+        if err != nil {
+                return
+        }
+        uat.Contents, err = OpaqueSubpackets(b)
+        return
+}
+
+// Serialize marshals the user attribute to w in the form of an OpenPGP packet, including
+// header.
+func (uat *UserAttribute) Serialize(w io.Writer) (err error) {
+        var buf bytes.Buffer
+        for _, sp := range uat.Contents {
+                sp.Serialize(&buf)
+        }
+        if err = serializeHeader(w, packetTypeUserAttribute, buf.Len()); err != nil {
+                return err
+        }
+        _, err = w.Write(buf.Bytes())
+        return
+}
+
+// ImageData returns zero or more byte slices, each containing
+// JPEG File Interchange Format (JFIF), for each photo in the
+// the user attribute packet.
+func (uat *UserAttribute) ImageData() (imageData [][]byte) {
+        for _, sp := range uat.Contents {
+                if sp.SubType == UserAttrImageSubpacket && len(sp.Contents) > 16 {
+                        imageData = append(imageData, sp.Contents[16:])
+                }
+        }
+        return
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/packet/userid.go b/vendor/golang.org/x/crypto/openpgp/packet/userid.go
new file mode 100644
index 0000000..d6bea7d
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/packet/userid.go
@@ -0,0 +1,160 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+        "io"
+        "io/ioutil"
+        "strings"
+)
+
+// UserId contains text that is intended to represent the name and email
+// address of the key holder. See RFC 4880, section 5.11. By convention, this
+// takes the form "Full Name (Comment) <email@example.com>"
+type UserId struct {
+        Id string // By convention, this takes the form "Full Name (Comment) <email@example.com>" which is split out in the fields below.
+
+        Name, Comment, Email string
+}
+
+func hasInvalidCharacters(s string) bool {
+        for _, c := range s {
+                switch c {
+                case '(', ')', '<', '>', 0:
+                        return true
+                }
+        }
+        return false
+}
+
+// NewUserId returns a UserId or nil if any of the arguments contain invalid
+// characters. The invalid characters are '\x00', '(', ')', '<' and '>'
+func NewUserId(name, comment, email string) *UserId {
+        // RFC 4880 doesn't deal with the structure of userid strings; the
+        // name, comment and email form is just a convention. However, there's
+        // no convention about escaping the metacharacters and GPG just refuses
+        // to create user ids where, say, the name contains a '('. We mirror
+        // this behaviour.
+
+        if hasInvalidCharacters(name) || hasInvalidCharacters(comment) || hasInvalidCharacters(email) {
+                return nil
+        }
+
+        uid := new(UserId)
+        uid.Name, uid.Comment, uid.Email = name, comment, email
+        uid.Id = name
+        if len(comment) > 0 {
+                if len(uid.Id) > 0 {
+                        uid.Id += " "
+                }
+                uid.Id += "("
+                uid.Id += comment
+                uid.Id += ")"
+        }
+        if len(email) > 0 {
+                if len(uid.Id) > 0 {
+                        uid.Id += " "
+                }
+                uid.Id += "<"
+                uid.Id += email
+                uid.Id += ">"
+        }
+        return uid
+}
+
+func (uid *UserId) parse(r io.Reader) (err error) {
+        // RFC 4880, section 5.11
+        b, err := ioutil.ReadAll(r)
+        if err != nil {
+                return
+        }
+        uid.Id = string(b)
+        uid.Name, uid.Comment, uid.Email = parseUserId(uid.Id)
+        return
+}
+
+// Serialize marshals uid to w in the form of an OpenPGP packet, including
+// header.
+func (uid *UserId) Serialize(w io.Writer) error {
+        err := serializeHeader(w, packetTypeUserId, len(uid.Id))
+        if err != nil {
+                return err
+        }
+        _, err = w.Write([]byte(uid.Id))
+        return err
+}
+
+// parseUserId extracts the name, comment and email from a user id string that
+// is formatted as "Full Name (Comment) <email@example.com>".
+func parseUserId(id string) (name, comment, email string) {
+        var n, c, e struct {
+                start, end int
+        }
+        var state int
+
+        for offset, rune := range id {
+                switch state {
+                case 0:
+                        // Entering name
+                        n.start = offset
+                        state = 1
+                        fallthrough
+                case 1:
+                        // In name
+                        if rune == '(' {
+                                state = 2
+                                n.end = offset
+                        } else if rune == '<' {
+                                state = 5
+                                n.end = offset
+                        }
+                case 2:
+                        // Entering comment
+                        c.start = offset
+                        state = 3
+                        fallthrough
+                case 3:
+                        // In comment
+                        if rune == ')' {
+                                state = 4
+                                c.end = offset
+                        }
+                case 4:
+                        // Between comment and email
+                        if rune == '<' {
+                                state = 5
+                        }
+                case 5:
+                        // Entering email
+                        e.start = offset
+                        state = 6
+                        fallthrough
+                case 6:
+                        // In email
+                        if rune == '>' {
+                                state = 7
+                                e.end = offset
+                        }
+                default:
+                        // After email
+                }
+        }
+        switch state {
+        case 1:
+                // ended in the name
+                n.end = len(id)
+        case 3:
+                // ended in comment
+                c.end = len(id)
+        case 6:
+                // ended in email
+                e.end = len(id)
+        }
+
+        name = strings.TrimSpace(id[n.start:n.end])
+        comment = strings.TrimSpace(id[c.start:c.end])
+        email = strings.TrimSpace(id[e.start:e.end])
+        return
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/read.go b/vendor/golang.org/x/crypto/openpgp/read.go
new file mode 100644
index 0000000..6ec664f
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/read.go
@@ -0,0 +1,442 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package openpgp implements high level operations on OpenPGP messages.
+package openpgp // import "golang.org/x/crypto/openpgp"
+
+import (
+        "crypto"
+        _ "crypto/sha256"
+        "hash"
+        "io"
+        "strconv"
+
+        "golang.org/x/crypto/openpgp/armor"
+        "golang.org/x/crypto/openpgp/errors"
+        "golang.org/x/crypto/openpgp/packet"
+)
+
+// SignatureType is the armor type for a PGP signature.
+var SignatureType = "PGP SIGNATURE"
+
+// readArmored reads an armored block with the given type.
+func readArmored(r io.Reader, expectedType string) (body io.Reader, err error) {
+        block, err := armor.Decode(r)
+        if err != nil {
+                return
+        }
+
+        if block.Type != expectedType {
+                return nil, errors.InvalidArgumentError("expected '" + expectedType + "', got: " + block.Type)
+        }
+
+        return block.Body, nil
+}
+
+// MessageDetails contains the result of parsing an OpenPGP encrypted and/or
+// signed message.
+type MessageDetails struct {
+        IsEncrypted              bool                // true if the message was encrypted.
+        EncryptedToKeyIds        []uint64            // the list of recipient key ids.
+        IsSymmetricallyEncrypted bool                // true if a passphrase could have decrypted the message.
+        DecryptedWith            Key                 // the private key used to decrypt the message, if any.
+        IsSigned                 bool                // true if the message is signed.
+        SignedByKeyId            uint64              // the key id of the signer, if any.
+        SignedBy                 *Key                // the key of the signer, if available.
+        LiteralData              *packet.LiteralData // the metadata of the contents
+        UnverifiedBody           io.Reader           // the contents of the message.
+
+        // If IsSigned is true and SignedBy is non-zero then the signature will
+        // be verified as UnverifiedBody is read. The signature cannot be
+        // checked until the whole of UnverifiedBody is read so UnverifiedBody
+        // must be consumed until EOF before the data can be trusted. Even if a
+        // message isn't signed (or the signer is unknown) the data may contain
+        // an authentication code that is only checked once UnverifiedBody has
+        // been consumed. Once EOF has been seen, the following fields are
+        // valid. (An authentication code failure is reported as a
+        // SignatureError error when reading from UnverifiedBody.)
+        SignatureError error               // nil if the signature is good.
+        Signature      *packet.Signature   // the signature packet itself, if v4 (default)
+        SignatureV3    *packet.SignatureV3 // the signature packet if it is a v2 or v3 signature
+
+        decrypted io.ReadCloser
+}
+
+// A PromptFunction is used as a callback by functions that may need to decrypt
+// a private key, or prompt for a passphrase. It is called with a list of
+// acceptable, encrypted private keys and a boolean that indicates whether a
+// passphrase is usable. It should either decrypt a private key or return a
+// passphrase to try. If the decrypted private key or given passphrase isn't
+// correct, the function will be called again, forever. Any error returned will
+// be passed up.
+type PromptFunction func(keys []Key, symmetric bool) ([]byte, error)
+
+// A keyEnvelopePair is used to store a private key with the envelope that
+// contains a symmetric key, encrypted with that key.
+type keyEnvelopePair struct {
+        key          Key
+        encryptedKey *packet.EncryptedKey
+}
+
+// ReadMessage parses an OpenPGP message that may be signed and/or encrypted.
+// The given KeyRing should contain both public keys (for signature
+// verification) and, possibly encrypted, private keys for decrypting.
+// If config is nil, sensible defaults will be used.
+func ReadMessage(r io.Reader, keyring KeyRing, prompt PromptFunction, config *packet.Config) (md *MessageDetails, err error) {
+        var p packet.Packet
+
+        var symKeys []*packet.SymmetricKeyEncrypted
+        var pubKeys []keyEnvelopePair
+        var se *packet.SymmetricallyEncrypted
+
+        packets := packet.NewReader(r)
+        md = new(MessageDetails)
+        md.IsEncrypted = true
+
+        // The message, if encrypted, starts with a number of packets
+        // containing an encrypted decryption key. The decryption key is either
+        // encrypted to a public key, or with a passphrase. This loop
+        // collects these packets.
+ParsePackets:
+        for {
+                p, err = packets.Next()
+                if err != nil {
+                        return nil, err
+                }
+                switch p := p.(type) {
+                case *packet.SymmetricKeyEncrypted:
+                        // This packet contains the decryption key encrypted with a passphrase.
+                        md.IsSymmetricallyEncrypted = true
+                        symKeys = append(symKeys, p)
+                case *packet.EncryptedKey:
+                        // This packet contains the decryption key encrypted to a public key.
+                        md.EncryptedToKeyIds = append(md.EncryptedToKeyIds, p.KeyId)
+                        switch p.Algo {
+                        case packet.PubKeyAlgoRSA, packet.PubKeyAlgoRSAEncryptOnly, packet.PubKeyAlgoElGamal:
+                                break
+                        default:
+                                continue
+                        }
+                        var keys []Key
+                        if p.KeyId == 0 {
+                                keys = keyring.DecryptionKeys()
+                        } else {
+                                keys = keyring.KeysById(p.KeyId)
+                        }
+                        for _, k := range keys {
+                                pubKeys = append(pubKeys, keyEnvelopePair{k, p})
+                        }
+                case *packet.SymmetricallyEncrypted:
+                        se = p
+                        break ParsePackets
+                case *packet.Compressed, *packet.LiteralData, *packet.OnePassSignature:
+                        // This message isn't encrypted.
+                        if len(symKeys) != 0 || len(pubKeys) != 0 {
+                                return nil, errors.StructuralError("key material not followed by encrypted message")
+                        }
+                        packets.Unread(p)
+                        return readSignedMessage(packets, nil, keyring)
+                }
+        }
+
+        var candidates []Key
+        var decrypted io.ReadCloser
+
+        // Now that we have the list of encrypted keys we need to decrypt at
+        // least one of them or, if we cannot, we need to call the prompt
+        // function so that it can decrypt a key or give us a passphrase.
+FindKey:
+        for {
+                // See if any of the keys already have a private key available
+                candidates = candidates[:0]
+                candidateFingerprints := make(map[string]bool)
+
+                for _, pk := range pubKeys {
+                        if pk.key.PrivateKey == nil {
+                                continue
+                        }
+                        if !pk.key.PrivateKey.Encrypted {
+                                if len(pk.encryptedKey.Key) == 0 {
+                                        pk.encryptedKey.Decrypt(pk.key.PrivateKey, config)
+                                }
+                                if len(pk.encryptedKey.Key) == 0 {
+                                        continue
+                                }
+                                decrypted, err = se.Decrypt(pk.encryptedKey.CipherFunc, pk.encryptedKey.Key)
+                                if err != nil && err != errors.ErrKeyIncorrect {
+                                        return nil, err
+                                }
+                                if decrypted != nil {
+                                        md.DecryptedWith = pk.key
+                                        break FindKey
+                                }
+                        } else {
+                                fpr := string(pk.key.PublicKey.Fingerprint[:])
+                                if v := candidateFingerprints[fpr]; v {
+                                        continue
+                                }
+                                candidates = append(candidates, pk.key)
+                                candidateFingerprints[fpr] = true
+                        }
+                }
+
+                if len(candidates) == 0 && len(symKeys) == 0 {
+                        return nil, errors.ErrKeyIncorrect
+                }
+
+                if prompt == nil {
+                        return nil, errors.ErrKeyIncorrect
+                }
+
+                passphrase, err := prompt(candidates, len(symKeys) != 0)
+                if err != nil {
+                        return nil, err
+                }
+
+                // Try the symmetric passphrase first
+                if len(symKeys) != 0 && passphrase != nil {
+                        for _, s := range symKeys {
+                                key, cipherFunc, err := s.Decrypt(passphrase)
+                                if err == nil {
+                                        decrypted, err = se.Decrypt(cipherFunc, key)
+                                        if err != nil && err != errors.ErrKeyIncorrect {
+                                                return nil, err
+                                        }
+                                        if decrypted != nil {
+                                                break FindKey
+                                        }
+                                }
+
+                        }
+                }
+        }
+
+        md.decrypted = decrypted
+        if err := packets.Push(decrypted); err != nil {
+                return nil, err
+        }
+        return readSignedMessage(packets, md, keyring)
+}
+
+// readSignedMessage reads a possibly signed message if mdin is non-zero then
+// that structure is updated and returned. Otherwise a fresh MessageDetails is
+// used.
+func readSignedMessage(packets *packet.Reader, mdin *MessageDetails, keyring KeyRing) (md *MessageDetails, err error) {
+        if mdin == nil {
+                mdin = new(MessageDetails)
+        }
+        md = mdin
+
+        var p packet.Packet
+        var h hash.Hash
+        var wrappedHash hash.Hash
+FindLiteralData:
+        for {
+                p, err = packets.Next()
+                if err != nil {
+                        return nil, err
+                }
+                switch p := p.(type) {
+                case *packet.Compressed:
+                        if err := packets.Push(p.Body); err != nil {
+                                return nil, err
+                        }
+                case *packet.OnePassSignature:
+                        if !p.IsLast {
+                                return nil, errors.UnsupportedError("nested signatures")
+                        }
+
+                        h, wrappedHash, err = hashForSignature(p.Hash, p.SigType)
+                        if err != nil {
+                                md = nil
+                                return
+                        }
+
+                        md.IsSigned = true
+                        md.SignedByKeyId = p.KeyId
+                        keys := keyring.KeysByIdUsage(p.KeyId, packet.KeyFlagSign)
+                        if len(keys) > 0 {
+                                md.SignedBy = &keys[0]
+                        }
+                case *packet.LiteralData:
+                        md.LiteralData = p
+                        break FindLiteralData
+                }
+        }
+
+        if md.SignedBy != nil {
+                md.UnverifiedBody = &signatureCheckReader{packets, h, wrappedHash, md}
+        } else if md.decrypted != nil {
+                md.UnverifiedBody = checkReader{md}
+        } else {
+                md.UnverifiedBody = md.LiteralData.Body
+        }
+
+        return md, nil
+}
+
+// hashForSignature returns a pair of hashes that can be used to verify a
+// signature. The signature may specify that the contents of the signed message
+// should be preprocessed (i.e. to normalize line endings). Thus this function
+// returns two hashes. The second should be used to hash the message itself and
+// performs any needed preprocessing.
+func hashForSignature(hashId crypto.Hash, sigType packet.SignatureType) (hash.Hash, hash.Hash, error) {
+        if !hashId.Available() {
+                return nil, nil, errors.UnsupportedError("hash not available: " + strconv.Itoa(int(hashId)))
+        }
+        h := hashId.New()
+
+        switch sigType {
+        case packet.SigTypeBinary:
+                return h, h, nil
+        case packet.SigTypeText:
+                return h, NewCanonicalTextHash(h), nil
+        }
+
+        return nil, nil, errors.UnsupportedError("unsupported signature type: " + strconv.Itoa(int(sigType)))
+}
+
+// checkReader wraps an io.Reader from a LiteralData packet. When it sees EOF
+// it closes the ReadCloser from any SymmetricallyEncrypted packet to trigger
+// MDC checks.
+type checkReader struct {
+        md *MessageDetails
+}
+
+func (cr checkReader) Read(buf []byte) (n int, err error) {
+        n, err = cr.md.LiteralData.Body.Read(buf)
+        if err == io.EOF {
+                mdcErr := cr.md.decrypted.Close()
+                if mdcErr != nil {
+                        err = mdcErr
+                }
+        }
+        return
+}
+
+// signatureCheckReader wraps an io.Reader from a LiteralData packet and hashes
+// the data as it is read. When it sees an EOF from the underlying io.Reader
+// it parses and checks a trailing Signature packet and triggers any MDC checks.
+type signatureCheckReader struct {
+        packets        *packet.Reader
+        h, wrappedHash hash.Hash
+        md             *MessageDetails
+}
+
+func (scr *signatureCheckReader) Read(buf []byte) (n int, err error) {
+        n, err = scr.md.LiteralData.Body.Read(buf)
+        scr.wrappedHash.Write(buf[:n])
+        if err == io.EOF {
+                var p packet.Packet
+                p, scr.md.SignatureError = scr.packets.Next()
+                if scr.md.SignatureError != nil {
+                        return
+                }
+
+                var ok bool
+                if scr.md.Signature, ok = p.(*packet.Signature); ok {
+                        scr.md.SignatureError = scr.md.SignedBy.PublicKey.VerifySignature(scr.h, scr.md.Signature)
+                } else if scr.md.SignatureV3, ok = p.(*packet.SignatureV3); ok {
+                        scr.md.SignatureError = scr.md.SignedBy.PublicKey.VerifySignatureV3(scr.h, scr.md.SignatureV3)
+                } else {
+                        scr.md.SignatureError = errors.StructuralError("LiteralData not followed by Signature")
+                        return
+                }
+
+                // The SymmetricallyEncrypted packet, if any, might have an
+                // unsigned hash of its own. In order to check this we need to
+                // close that Reader.
+                if scr.md.decrypted != nil {
+                        mdcErr := scr.md.decrypted.Close()
+                        if mdcErr != nil {
+                                err = mdcErr
+                        }
+                }
+        }
+        return
+}
+
+// CheckDetachedSignature takes a signed file and a detached signature and
+// returns the signer if the signature is valid. If the signer isn't known,
+// ErrUnknownIssuer is returned.
+func CheckDetachedSignature(keyring KeyRing, signed, signature io.Reader) (signer *Entity, err error) {
+        var issuerKeyId uint64
+        var hashFunc crypto.Hash
+        var sigType packet.SignatureType
+        var keys []Key
+        var p packet.Packet
+
+        packets := packet.NewReader(signature)
+        for {
+                p, err = packets.Next()
+                if err == io.EOF {
+                        return nil, errors.ErrUnknownIssuer
+                }
+                if err != nil {
+                        return nil, err
+                }
+
+                switch sig := p.(type) {
+                case *packet.Signature:
+                        if sig.IssuerKeyId == nil {
+                                return nil, errors.StructuralError("signature doesn't have an issuer")
+                        }
+                        issuerKeyId = *sig.IssuerKeyId
+                        hashFunc = sig.Hash
+                        sigType = sig.SigType
+                case *packet.SignatureV3:
+                        issuerKeyId = sig.IssuerKeyId
+                        hashFunc = sig.Hash
+                        sigType = sig.SigType
+                default:
+                        return nil, errors.StructuralError("non signature packet found")
+                }
+
+                keys = keyring.KeysByIdUsage(issuerKeyId, packet.KeyFlagSign)
+                if len(keys) > 0 {
+                        break
+                }
+        }
+
+        if len(keys) == 0 {
+                panic("unreachable")
+        }
+
+        h, wrappedHash, err := hashForSignature(hashFunc, sigType)
+        if err != nil {
+                return nil, err
+        }
+
+        if _, err := io.Copy(wrappedHash, signed); err != nil && err != io.EOF {
+                return nil, err
+        }
+
+        for _, key := range keys {
+                switch sig := p.(type) {
+                case *packet.Signature:
+                        err = key.PublicKey.VerifySignature(h, sig)
+                case *packet.SignatureV3:
+                        err = key.PublicKey.VerifySignatureV3(h, sig)
+                default:
+                        panic("unreachable")
+                }
+
+                if err == nil {
+                        return key.Entity, nil
+                }
+        }
+
+        return nil, err
+}
+
+// CheckArmoredDetachedSignature performs the same actions as
+// CheckDetachedSignature but expects the signature to be armored.
+func CheckArmoredDetachedSignature(keyring KeyRing, signed, signature io.Reader) (signer *Entity, err error) {
+        body, err := readArmored(signature, SignatureType)
+        if err != nil {
+                return
+        }
+
+        return CheckDetachedSignature(keyring, signed, body)
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/s2k/s2k.go b/vendor/golang.org/x/crypto/openpgp/s2k/s2k.go
new file mode 100644
index 0000000..4b9a44c
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/s2k/s2k.go
@@ -0,0 +1,273 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package s2k implements the various OpenPGP string-to-key transforms as
+// specified in RFC 4800 section 3.7.1.
+package s2k // import "golang.org/x/crypto/openpgp/s2k"
+
+import (
+        "crypto"
+        "hash"
+        "io"
+        "strconv"
+
+        "golang.org/x/crypto/openpgp/errors"
+)
+
+// Config collects configuration parameters for s2k key-stretching
+// transformatioms. A nil *Config is valid and results in all default
+// values. Currently, Config is used only by the Serialize function in
+// this package.
+type Config struct {
+        // Hash is the default hash function to be used. If
+        // nil, SHA1 is used.
+        Hash crypto.Hash
+        // S2KCount is only used for symmetric encryption. It
+        // determines the strength of the passphrase stretching when
+        // the said passphrase is hashed to produce a key. S2KCount
+        // should be between 1024 and 65011712, inclusive. If Config
+        // is nil or S2KCount is 0, the value 65536 used. Not all
+        // values in the above range can be represented. S2KCount will
+        // be rounded up to the next representable value if it cannot
+        // be encoded exactly. When set, it is strongly encrouraged to
+        // use a value that is at least 65536. See RFC 4880 Section
+        // 3.7.1.3.
+        S2KCount int
+}
+
+func (c *Config) hash() crypto.Hash {
+        if c == nil || uint(c.Hash) == 0 {
+                // SHA1 is the historical default in this package.
+                return crypto.SHA1
+        }
+
+        return c.Hash
+}
+
+func (c *Config) encodedCount() uint8 {
+        if c == nil || c.S2KCount == 0 {
+                return 96 // The common case. Correspoding to 65536
+        }
+
+        i := c.S2KCount
+        switch {
+        // Behave like GPG. Should we make 65536 the lowest value used?
+        case i < 1024:
+                i = 1024
+        case i > 65011712:
+                i = 65011712
+        }
+
+        return encodeCount(i)
+}
+
+// encodeCount converts an iterative "count" in the range 1024 to
+// 65011712, inclusive, to an encoded count. The return value is the
+// octet that is actually stored in the GPG file. encodeCount panics
+// if i is not in the above range (encodedCount above takes care to
+// pass i in the correct range). See RFC 4880 Section 3.7.7.1.
+func encodeCount(i int) uint8 {
+        if i < 1024 || i > 65011712 {
+                panic("count arg i outside the required range")
+        }
+
+        for encoded := 0; encoded < 256; encoded++ {
+                count := decodeCount(uint8(encoded))
+                if count >= i {
+                        return uint8(encoded)
+                }
+        }
+
+        return 255
+}
+
+// decodeCount returns the s2k mode 3 iterative "count" corresponding to
+// the encoded octet c.
+func decodeCount(c uint8) int {
+        return (16 + int(c&15)) << (uint32(c>>4) + 6)
+}
+
+// Simple writes to out the result of computing the Simple S2K function (RFC
+// 4880, section 3.7.1.1) using the given hash and input passphrase.
+func Simple(out []byte, h hash.Hash, in []byte) {
+        Salted(out, h, in, nil)
+}
+
+var zero [1]byte
+
+// Salted writes to out the result of computing the Salted S2K function (RFC
+// 4880, section 3.7.1.2) using the given hash, input passphrase and salt.
+func Salted(out []byte, h hash.Hash, in []byte, salt []byte) {
+        done := 0
+        var digest []byte
+
+        for i := 0; done < len(out); i++ {
+                h.Reset()
+                for j := 0; j < i; j++ {
+                        h.Write(zero[:])
+                }
+                h.Write(salt)
+                h.Write(in)
+                digest = h.Sum(digest[:0])
+                n := copy(out[done:], digest)
+                done += n
+        }
+}
+
+// Iterated writes to out the result of computing the Iterated and Salted S2K
+// function (RFC 4880, section 3.7.1.3) using the given hash, input passphrase,
+// salt and iteration count.
+func Iterated(out []byte, h hash.Hash, in []byte, salt []byte, count int) {
+        combined := make([]byte, len(in)+len(salt))
+        copy(combined, salt)
+        copy(combined[len(salt):], in)
+
+        if count < len(combined) {
+                count = len(combined)
+        }
+
+        done := 0
+        var digest []byte
+        for i := 0; done < len(out); i++ {
+                h.Reset()
+                for j := 0; j < i; j++ {
+                        h.Write(zero[:])
+                }
+                written := 0
+                for written < count {
+                        if written+len(combined) > count {
+                                todo := count - written
+                                h.Write(combined[:todo])
+                                written = count
+                        } else {
+                                h.Write(combined)
+                                written += len(combined)
+                        }
+                }
+                digest = h.Sum(digest[:0])
+                n := copy(out[done:], digest)
+                done += n
+        }
+}
+
+// Parse reads a binary specification for a string-to-key transformation from r
+// and returns a function which performs that transform.
+func Parse(r io.Reader) (f func(out, in []byte), err error) {
+        var buf [9]byte
+
+        _, err = io.ReadFull(r, buf[:2])
+        if err != nil {
+                return
+        }
+
+        hash, ok := HashIdToHash(buf[1])
+        if !ok {
+                return nil, errors.UnsupportedError("hash for S2K function: " + strconv.Itoa(int(buf[1])))
+        }
+        if !hash.Available() {
+                return nil, errors.UnsupportedError("hash not available: " + strconv.Itoa(int(hash)))
+        }
+        h := hash.New()
+
+        switch buf[0] {
+        case 0:
+                f := func(out, in []byte) {
+                        Simple(out, h, in)
+                }
+                return f, nil
+        case 1:
+                _, err = io.ReadFull(r, buf[:8])
+                if err != nil {
+                        return
+                }
+                f := func(out, in []byte) {
+                        Salted(out, h, in, buf[:8])
+                }
+                return f, nil
+        case 3:
+                _, err = io.ReadFull(r, buf[:9])
+                if err != nil {
+                        return
+                }
+                count := decodeCount(buf[8])
+                f := func(out, in []byte) {
+                        Iterated(out, h, in, buf[:8], count)
+                }
+                return f, nil
+        }
+
+        return nil, errors.UnsupportedError("S2K function")
+}
+
+// Serialize salts and stretches the given passphrase and writes the
+// resulting key into key. It also serializes an S2K descriptor to
+// w. The key stretching can be configured with c, which may be
+// nil. In that case, sensible defaults will be used.
+func Serialize(w io.Writer, key []byte, rand io.Reader, passphrase []byte, c *Config) error {
+        var buf [11]byte
+        buf[0] = 3 /* iterated and salted */
+        buf[1], _ = HashToHashId(c.hash())
+        salt := buf[2:10]
+        if _, err := io.ReadFull(rand, salt); err != nil {
+                return err
+        }
+        encodedCount := c.encodedCount()
+        count := decodeCount(encodedCount)
+        buf[10] = encodedCount
+        if _, err := w.Write(buf[:]); err != nil {
+                return err
+        }
+
+        Iterated(key, c.hash().New(), passphrase, salt, count)
+        return nil
+}
+
+// hashToHashIdMapping contains pairs relating OpenPGP's hash identifier with
+// Go's crypto.Hash type. See RFC 4880, section 9.4.
+var hashToHashIdMapping = []struct {
+        id   byte
+        hash crypto.Hash
+        name string
+}{
+        {1, crypto.MD5, "MD5"},
+        {2, crypto.SHA1, "SHA1"},
+        {3, crypto.RIPEMD160, "RIPEMD160"},
+        {8, crypto.SHA256, "SHA256"},
+        {9, crypto.SHA384, "SHA384"},
+        {10, crypto.SHA512, "SHA512"},
+        {11, crypto.SHA224, "SHA224"},
+}
+
+// HashIdToHash returns a crypto.Hash which corresponds to the given OpenPGP
+// hash id.
+func HashIdToHash(id byte) (h crypto.Hash, ok bool) {
+        for _, m := range hashToHashIdMapping {
+                if m.id == id {
+                        return m.hash, true
+                }
+        }
+        return 0, false
+}
+
+// HashIdToString returns the name of the hash function corresponding to the
+// given OpenPGP hash id.
+func HashIdToString(id byte) (name string, ok bool) {
+        for _, m := range hashToHashIdMapping {
+                if m.id == id {
+                        return m.name, true
+                }
+        }
+
+        return "", false
+}
+
+// HashIdToHash returns an OpenPGP hash id which corresponds the given Hash.
+func HashToHashId(h crypto.Hash) (id byte, ok bool) {
+        for _, m := range hashToHashIdMapping {
+                if m.hash == h {
+                        return m.id, true
+                }
+        }
+        return 0, false
+}
diff --git a/vendor/golang.org/x/crypto/openpgp/write.go b/vendor/golang.org/x/crypto/openpgp/write.go
new file mode 100644
index 0000000..65a304c
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/write.go
@@ -0,0 +1,378 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package openpgp
+
+import (
+        "crypto"
+        "hash"
+        "io"
+        "strconv"
+        "time"
+
+        "golang.org/x/crypto/openpgp/armor"
+        "golang.org/x/crypto/openpgp/errors"
+        "golang.org/x/crypto/openpgp/packet"
+        "golang.org/x/crypto/openpgp/s2k"
+)
+
+// DetachSign signs message with the private key from signer (which must
+// already have been decrypted) and writes the signature to w.
+// If config is nil, sensible defaults will be used.
+func DetachSign(w io.Writer, signer *Entity, message io.Reader, config *packet.Config) error {
+        return detachSign(w, signer, message, packet.SigTypeBinary, config)
+}
+
+// ArmoredDetachSign signs message with the private key from signer (which
+// must already have been decrypted) and writes an armored signature to w.
+// If config is nil, sensible defaults will be used.
+func ArmoredDetachSign(w io.Writer, signer *Entity, message io.Reader, config *packet.Config) (err error) {
+        return armoredDetachSign(w, signer, message, packet.SigTypeBinary, config)
+}
+
+// DetachSignText signs message (after canonicalising the line endings) with
+// the private key from signer (which must already have been decrypted) and
+// writes the signature to w.
+// If config is nil, sensible defaults will be used.
+func DetachSignText(w io.Writer, signer *Entity, message io.Reader, config *packet.Config) error {
+        return detachSign(w, signer, message, packet.SigTypeText, config)
+}
+
+// ArmoredDetachSignText signs message (after canonicalising the line endings)
+// with the private key from signer (which must already have been decrypted)
+// and writes an armored signature to w.
+// If config is nil, sensible defaults will be used.
+func ArmoredDetachSignText(w io.Writer, signer *Entity, message io.Reader, config *packet.Config) error {
+        return armoredDetachSign(w, signer, message, packet.SigTypeText, config)
+}
+
+func armoredDetachSign(w io.Writer, signer *Entity, message io.Reader, sigType packet.SignatureType, config *packet.Config) (err error) {
+        out, err := armor.Encode(w, SignatureType, nil)
+        if err != nil {
+                return
+        }
+        err = detachSign(out, signer, message, sigType, config)
+        if err != nil {
+                return
+        }
+        return out.Close()
+}
+
+func detachSign(w io.Writer, signer *Entity, message io.Reader, sigType packet.SignatureType, config *packet.Config) (err error) {
+        if signer.PrivateKey == nil {
+                return errors.InvalidArgumentError("signing key doesn't have a private key")
+        }
+        if signer.PrivateKey.Encrypted {
+                return errors.InvalidArgumentError("signing key is encrypted")
+        }
+
+        sig := new(packet.Signature)
+        sig.SigType = sigType
+        sig.PubKeyAlgo = signer.PrivateKey.PubKeyAlgo
+        sig.Hash = config.Hash()
+        sig.CreationTime = config.Now()
+        sig.IssuerKeyId = &signer.PrivateKey.KeyId
+
+        h, wrappedHash, err := hashForSignature(sig.Hash, sig.SigType)
+        if err != nil {
+                return
+        }
+        io.Copy(wrappedHash, message)
+
+        err = sig.Sign(h, signer.PrivateKey, config)
+        if err != nil {
+                return
+        }
+
+        return sig.Serialize(w)
+}
+
+// FileHints contains metadata about encrypted files. This metadata is, itself,
+// encrypted.
+type FileHints struct {
+        // IsBinary can be set to hint that the contents are binary data.
+        IsBinary bool
+        // FileName hints at the name of the file that should be written. It's
+        // truncated to 255 bytes if longer. It may be empty to suggest that the
+        // file should not be written to disk. It may be equal to "_CONSOLE" to
+        // suggest the data should not be written to disk.
+        FileName string
+        // ModTime contains the modification time of the file, or the zero time if not applicable.
+        ModTime time.Time
+}
+
+// SymmetricallyEncrypt acts like gpg -c: it encrypts a file with a passphrase.
+// The resulting WriteCloser must be closed after the contents of the file have
+// been written.
+// If config is nil, sensible defaults will be used.
+func SymmetricallyEncrypt(ciphertext io.Writer, passphrase []byte, hints *FileHints, config *packet.Config) (plaintext io.WriteCloser, err error) {
+        if hints == nil {
+                hints = &FileHints{}
+        }
+
+        key, err := packet.SerializeSymmetricKeyEncrypted(ciphertext, passphrase, config)
+        if err != nil {
+                return
+        }
+        w, err := packet.SerializeSymmetricallyEncrypted(ciphertext, config.Cipher(), key, config)
+        if err != nil {
+                return
+        }
+
+        literaldata := w
+        if algo := config.Compression(); algo != packet.CompressionNone {
+                var compConfig *packet.CompressionConfig
+                if config != nil {
+                        compConfig = config.CompressionConfig
+                }
+                literaldata, err = packet.SerializeCompressed(w, algo, compConfig)
+                if err != nil {
+                        return
+                }
+        }
+
+        var epochSeconds uint32
+        if !hints.ModTime.IsZero() {
+                epochSeconds = uint32(hints.ModTime.Unix())
+        }
+        return packet.SerializeLiteral(literaldata, hints.IsBinary, hints.FileName, epochSeconds)
+}
+
+// intersectPreferences mutates and returns a prefix of a that contains only
+// the values in the intersection of a and b. The order of a is preserved.
+func intersectPreferences(a []uint8, b []uint8) (intersection []uint8) {
+        var j int
+        for _, v := range a {
+                for _, v2 := range b {
+                        if v == v2 {
+                                a[j] = v
+                                j++
+                                break
+                        }
+                }
+        }
+
+        return a[:j]
+}
+
+func hashToHashId(h crypto.Hash) uint8 {
+        v, ok := s2k.HashToHashId(h)
+        if !ok {
+                panic("tried to convert unknown hash")
+        }
+        return v
+}
+
+// Encrypt encrypts a message to a number of recipients and, optionally, signs
+// it. hints contains optional information, that is also encrypted, that aids
+// the recipients in processing the message. The resulting WriteCloser must
+// be closed after the contents of the file have been written.
+// If config is nil, sensible defaults will be used.
+func Encrypt(ciphertext io.Writer, to []*Entity, signed *Entity, hints *FileHints, config *packet.Config) (plaintext io.WriteCloser, err error) {
+        var signer *packet.PrivateKey
+        if signed != nil {
+                signKey, ok := signed.signingKey(config.Now())
+                if !ok {
+                        return nil, errors.InvalidArgumentError("no valid signing keys")
+                }
+                signer = signKey.PrivateKey
+                if signer == nil {
+                        return nil, errors.InvalidArgumentError("no private key in signing key")
+                }
+                if signer.Encrypted {
+                        return nil, errors.InvalidArgumentError("signing key must be decrypted")
+                }
+        }
+
+        // These are the possible ciphers that we'll use for the message.
+        candidateCiphers := []uint8{
+                uint8(packet.CipherAES128),
+                uint8(packet.CipherAES256),
+                uint8(packet.CipherCAST5),
+        }
+        // These are the possible hash functions that we'll use for the signature.
+        candidateHashes := []uint8{
+                hashToHashId(crypto.SHA256),
+                hashToHashId(crypto.SHA512),
+                hashToHashId(crypto.SHA1),
+                hashToHashId(crypto.RIPEMD160),
+        }
+        // In the event that a recipient doesn't specify any supported ciphers
+        // or hash functions, these are the ones that we assume that every
+        // implementation supports.
+        defaultCiphers := candidateCiphers[len(candidateCiphers)-1:]
+        defaultHashes := candidateHashes[len(candidateHashes)-1:]
+
+        encryptKeys := make([]Key, len(to))
+        for i := range to {
+                var ok bool
+                encryptKeys[i], ok = to[i].encryptionKey(config.Now())
+                if !ok {
+                        return nil, errors.InvalidArgumentError("cannot encrypt a message to key id " + strconv.FormatUint(to[i].PrimaryKey.KeyId, 16) + " because it has no encryption keys")
+                }
+
+                sig := to[i].primaryIdentity().SelfSignature
+
+                preferredSymmetric := sig.PreferredSymmetric
+                if len(preferredSymmetric) == 0 {
+                        preferredSymmetric = defaultCiphers
+                }
+                preferredHashes := sig.PreferredHash
+                if len(preferredHashes) == 0 {
+                        preferredHashes = defaultHashes
+                }
+                candidateCiphers = intersectPreferences(candidateCiphers, preferredSymmetric)
+                candidateHashes = intersectPreferences(candidateHashes, preferredHashes)
+        }
+
+        if len(candidateCiphers) == 0 || len(candidateHashes) == 0 {
+                return nil, errors.InvalidArgumentError("cannot encrypt because recipient set shares no common algorithms")
+        }
+
+        cipher := packet.CipherFunction(candidateCiphers[0])
+        // If the cipher specified by config is a candidate, we'll use that.
+        configuredCipher := config.Cipher()
+        for _, c := range candidateCiphers {
+                cipherFunc := packet.CipherFunction(c)
+                if cipherFunc == configuredCipher {
+                        cipher = cipherFunc
+                        break
+                }
+        }
+
+        var hash crypto.Hash
+        for _, hashId := range candidateHashes {
+                if h, ok := s2k.HashIdToHash(hashId); ok && h.Available() {
+                        hash = h
+                        break
+                }
+        }
+
+        // If the hash specified by config is a candidate, we'll use that.
+        if configuredHash := config.Hash(); configuredHash.Available() {
+                for _, hashId := range candidateHashes {
+                        if h, ok := s2k.HashIdToHash(hashId); ok && h == configuredHash {
+                                hash = h
+                                break
+                        }
+                }
+        }
+
+        if hash == 0 {
+                hashId := candidateHashes[0]
+                name, ok := s2k.HashIdToString(hashId)
+                if !ok {
+                        name = "#" + strconv.Itoa(int(hashId))
+                }
+                return nil, errors.InvalidArgumentError("cannot encrypt because no candidate hash functions are compiled in. (Wanted " + name + " in this case.)")
+        }
+
+        symKey := make([]byte, cipher.KeySize())
+        if _, err := io.ReadFull(config.Random(), symKey); err != nil {
+                return nil, err
+        }
+
+        for _, key := range encryptKeys {
+                if err := packet.SerializeEncryptedKey(ciphertext, key.PublicKey, cipher, symKey, config); err != nil {
+                        return nil, err
+                }
+        }
+
+        encryptedData, err := packet.SerializeSymmetricallyEncrypted(ciphertext, cipher, symKey, config)
+        if err != nil {
+                return
+        }
+
+        if signer != nil {
+                ops := &packet.OnePassSignature{
+                        SigType:    packet.SigTypeBinary,
+                        Hash:       hash,
+                        PubKeyAlgo: signer.PubKeyAlgo,
+                        KeyId:      signer.KeyId,
+                        IsLast:     true,
+                }
+                if err := ops.Serialize(encryptedData); err != nil {
+                        return nil, err
+                }
+        }
+
+        if hints == nil {
+                hints = &FileHints{}
+        }
+
+        w := encryptedData
+        if signer != nil {
+                // If we need to write a signature packet after the literal
+                // data then we need to stop literalData from closing
+                // encryptedData.
+                w = noOpCloser{encryptedData}
+
+        }
+        var epochSeconds uint32
+        if !hints.ModTime.IsZero() {
+                epochSeconds = uint32(hints.ModTime.Unix())
+        }
+        literalData, err := packet.SerializeLiteral(w, hints.IsBinary, hints.FileName, epochSeconds)
+        if err != nil {
+                return nil, err
+        }
+
+        if signer != nil {
+                return signatureWriter{encryptedData, literalData, hash, hash.New(), signer, config}, nil
+        }
+        return literalData, nil
+}
+
+// signatureWriter hashes the contents of a message while passing it along to
+// literalData. When closed, it closes literalData, writes a signature packet
+// to encryptedData and then also closes encryptedData.
+type signatureWriter struct {
+        encryptedData io.WriteCloser
+        literalData   io.WriteCloser
+        hashType      crypto.Hash
+        h             hash.Hash
+        signer        *packet.PrivateKey
+        config        *packet.Config
+}
+
+func (s signatureWriter) Write(data []byte) (int, error) {
+        s.h.Write(data)
+        return s.literalData.Write(data)
+}
+
+func (s signatureWriter) Close() error {
+        sig := &packet.Signature{
+                SigType:      packet.SigTypeBinary,
+                PubKeyAlgo:   s.signer.PubKeyAlgo,
+                Hash:         s.hashType,
+                CreationTime: s.config.Now(),
+                IssuerKeyId:  &s.signer.KeyId,
+        }
+
+        if err := sig.Sign(s.h, s.signer, s.config); err != nil {
+                return err
+        }
+        if err := s.literalData.Close(); err != nil {
+                return err
+        }
+        if err := sig.Serialize(s.encryptedData); err != nil {
+                return err
+        }
+        return s.encryptedData.Close()
+}
+
+// noOpCloser is like an ioutil.NopCloser, but for an io.Writer.
+// TODO: we have two of these in OpenPGP packages alone. This probably needs
+// to be promoted somewhere more common.
+type noOpCloser struct {
+        w io.Writer
+}
+
+func (c noOpCloser) Write(data []byte) (n int, err error) {
+        return c.w.Write(data)
+}
+
+func (c noOpCloser) Close() error {
+        return nil
+}
diff --git a/vendor/golang.org/x/net/LICENSE b/vendor/golang.org/x/net/LICENSE
new file mode 100644
index 0000000..6a66aea
--- /dev/null
+++ b/vendor/golang.org/x/net/LICENSE
@@ -0,0 +1,27 @@
+Copyright (c) 2009 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/vendor/golang.org/x/net/PATENTS b/vendor/golang.org/x/net/PATENTS
new file mode 100644
index 0000000..7330990
--- /dev/null
+++ b/vendor/golang.org/x/net/PATENTS
@@ -0,0 +1,22 @@
+Additional IP Rights Grant (Patents)
+
+"This implementation" means the copyrightable works distributed by
+Google as part of the Go project.
+
+Google hereby grants to You a perpetual, worldwide, non-exclusive,
+no-charge, royalty-free, irrevocable (except as stated in this section)
+patent license to make, have made, use, offer to sell, sell, import,
+transfer and otherwise run, modify and propagate the contents of this
+implementation of Go, where such license applies only to those patent
+claims, both currently owned or controlled by Google and acquired in
+the future, licensable by Google that are necessarily infringed by this
+implementation of Go.  This grant does not include claims that would be
+infringed only as a consequence of further modification of this
+implementation.  If you or your agent or exclusive licensee institute or
+order or agree to the institution of patent litigation against any
+entity (including a cross-claim or counterclaim in a lawsuit) alleging
+that this implementation of Go or any code incorporated within this
+implementation of Go constitutes direct or contributory patent
+infringement, or inducement of patent infringement, then any patent
+rights granted to you under this License for this implementation of Go
+shall terminate as of the date such litigation is filed.
diff --git a/vendor/golang.org/x/net/html/atom/atom.go b/vendor/golang.org/x/net/html/atom/atom.go
new file mode 100644
index 0000000..cd0a8ac
--- /dev/null
+++ b/vendor/golang.org/x/net/html/atom/atom.go
@@ -0,0 +1,78 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package atom provides integer codes (also known as atoms) for a fixed set of
+// frequently occurring HTML strings: tag names and attribute keys such as "p"
+// and "id".
+//
+// Sharing an atom's name between all elements with the same tag can result in
+// fewer string allocations when tokenizing and parsing HTML. Integer
+// comparisons are also generally faster than string comparisons.
+//
+// The value of an atom's particular code is not guaranteed to stay the same
+// between versions of this package. Neither is any ordering guaranteed:
+// whether atom.H1 < atom.H2 may also change. The codes are not guaranteed to
+// be dense. The only guarantees are that e.g. looking up "div" will yield
+// atom.Div, calling atom.Div.String will return "div", and atom.Div != 0.
+package atom // import "golang.org/x/net/html/atom"
+
+// Atom is an integer code for a string. The zero value maps to "".
+type Atom uint32
+
+// String returns the atom's name.
+func (a Atom) String() string {
+        start := uint32(a >> 8)
+        n := uint32(a & 0xff)
+        if start+n > uint32(len(atomText)) {
+                return ""
+        }
+        return atomText[start : start+n]
+}
+
+func (a Atom) string() string {
+        return atomText[a>>8 : a>>8+a&0xff]
+}
+
+// fnv computes the FNV hash with an arbitrary starting value h.
+func fnv(h uint32, s []byte) uint32 {
+        for i := range s {
+                h ^= uint32(s[i])
+                h *= 16777619
+        }
+        return h
+}
+
+func match(s string, t []byte) bool {
+        for i, c := range t {
+                if s[i] != c {
+                        return false
+                }
+        }
+        return true
+}
+
+// Lookup returns the atom whose name is s. It returns zero if there is no
+// such atom. The lookup is case sensitive.
+func Lookup(s []byte) Atom {
+        if len(s) == 0 || len(s) > maxAtomLen {
+                return 0
+        }
+        h := fnv(hash0, s)
+        if a := table[h&uint32(len(table)-1)]; int(a&0xff) == len(s) && match(a.string(), s) {
+                return a
+        }
+        if a := table[(h>>16)&uint32(len(table)-1)]; int(a&0xff) == len(s) && match(a.string(), s) {
+                return a
+        }
+        return 0
+}
+
+// String returns a string whose contents are equal to s. In that sense, it is
+// equivalent to string(s) but may be more efficient.
+func String(s []byte) string {
+        if a := Lookup(s); a != 0 {
+                return a.String()
+        }
+        return string(s)
+}
diff --git a/vendor/golang.org/x/net/html/atom/table.go b/vendor/golang.org/x/net/html/atom/table.go
new file mode 100644
index 0000000..2605ba3
--- /dev/null
+++ b/vendor/golang.org/x/net/html/atom/table.go
@@ -0,0 +1,713 @@
+// generated by go run gen.go; DO NOT EDIT
+
+package atom
+
+const (
+        A                   Atom = 0x1
+        Abbr                Atom = 0x4
+        Accept              Atom = 0x2106
+        AcceptCharset       Atom = 0x210e
+        Accesskey           Atom = 0x3309
+        Action              Atom = 0x1f606
+        Address             Atom = 0x4f307
+        Align               Atom = 0x1105
+        Alt                 Atom = 0x4503
+        Annotation          Atom = 0x1670a
+        AnnotationXml       Atom = 0x1670e
+        Applet              Atom = 0x2b306
+        Area                Atom = 0x2fa04
+        Article             Atom = 0x38807
+        Aside               Atom = 0x8305
+        Async               Atom = 0x7b05
+        Audio               Atom = 0xa605
+        Autocomplete        Atom = 0x1fc0c
+        Autofocus           Atom = 0xb309
+        Autoplay            Atom = 0xce08
+        B                   Atom = 0x101
+        Base                Atom = 0xd604
+        Basefont            Atom = 0xd608
+        Bdi                 Atom = 0x1a03
+        Bdo                 Atom = 0xe703
+        Bgsound             Atom = 0x11807
+        Big                 Atom = 0x12403
+        Blink               Atom = 0x12705
+        Blockquote          Atom = 0x12c0a
+        Body                Atom = 0x2f04
+        Br                  Atom = 0x202
+        Button              Atom = 0x13606
+        Canvas              Atom = 0x7f06
+        Caption             Atom = 0x1bb07
+        Center              Atom = 0x5b506
+        Challenge           Atom = 0x21f09
+        Charset             Atom = 0x2807
+        Checked             Atom = 0x32807
+        Cite                Atom = 0x3c804
+        Class               Atom = 0x4de05
+        Code                Atom = 0x14904
+        Col                 Atom = 0x15003
+        Colgroup            Atom = 0x15008
+        Color               Atom = 0x15d05
+        Cols                Atom = 0x16204
+        Colspan             Atom = 0x16207
+        Command             Atom = 0x17507
+        Content             Atom = 0x42307
+        Contenteditable     Atom = 0x4230f
+        Contextmenu         Atom = 0x3310b
+        Controls            Atom = 0x18808
+        Coords              Atom = 0x19406
+        Crossorigin         Atom = 0x19f0b
+        Data                Atom = 0x44a04
+        Datalist            Atom = 0x44a08
+        Datetime            Atom = 0x23c08
+        Dd                  Atom = 0x26702
+        Default             Atom = 0x8607
+        Defer               Atom = 0x14b05
+        Del                 Atom = 0x3ef03
+        Desc                Atom = 0x4db04
+        Details             Atom = 0x4807
+        Dfn                 Atom = 0x6103
+        Dialog              Atom = 0x1b06
+        Dir                 Atom = 0x6903
+        Dirname             Atom = 0x6907
+        Disabled            Atom = 0x10c08
+        Div                 Atom = 0x11303
+        Dl                  Atom = 0x11e02
+        Download            Atom = 0x40008
+        Draggable           Atom = 0x17b09
+        Dropzone            Atom = 0x39108
+        Dt                  Atom = 0x50902
+        Em                  Atom = 0x6502
+        Embed               Atom = 0x6505
+        Enctype             Atom = 0x21107
+        Face                Atom = 0x5b304
+        Fieldset            Atom = 0x1b008
+        Figcaption          Atom = 0x1b80a
+        Figure              Atom = 0x1cc06
+        Font                Atom = 0xda04
+        Footer              Atom = 0x8d06
+        For                 Atom = 0x1d803
+        ForeignObject       Atom = 0x1d80d
+        Foreignobject       Atom = 0x1e50d
+        Form                Atom = 0x1f204
+        Formaction          Atom = 0x1f20a
+        Formenctype         Atom = 0x20d0b
+        Formmethod          Atom = 0x2280a
+        Formnovalidate      Atom = 0x2320e
+        Formtarget          Atom = 0x2470a
+        Frame               Atom = 0x9a05
+        Frameset            Atom = 0x9a08
+        H1                  Atom = 0x26e02
+        H2                  Atom = 0x29402
+        H3                  Atom = 0x2a702
+        H4                  Atom = 0x2e902
+        H5                  Atom = 0x2f302
+        H6                  Atom = 0x50b02
+        Head                Atom = 0x2d504
+        Header              Atom = 0x2d506
+        Headers             Atom = 0x2d507
+        Height              Atom = 0x25106
+        Hgroup              Atom = 0x25906
+        Hidden              Atom = 0x26506
+        High                Atom = 0x26b04
+        Hr                  Atom = 0x27002
+        Href                Atom = 0x27004
+        Hreflang            Atom = 0x27008
+        Html                Atom = 0x25504
+        HttpEquiv           Atom = 0x2780a
+        I                   Atom = 0x601
+        Icon                Atom = 0x42204
+        Id                  Atom = 0x8502
+        Iframe              Atom = 0x29606
+        Image               Atom = 0x29c05
+        Img                 Atom = 0x2a103
+        Input               Atom = 0x3e805
+        Inputmode           Atom = 0x3e809
+        Ins                 Atom = 0x1a803
+        Isindex             Atom = 0x2a907
+        Ismap               Atom = 0x2b005
+        Itemid              Atom = 0x33c06
+        Itemprop            Atom = 0x3c908
+        Itemref             Atom = 0x5ad07
+        Itemscope           Atom = 0x2b909
+        Itemtype            Atom = 0x2c308
+        Kbd                 Atom = 0x1903
+        Keygen              Atom = 0x3906
+        Keytype             Atom = 0x53707
+        Kind                Atom = 0x10904
+        Label               Atom = 0xf005
+        Lang                Atom = 0x27404
+        Legend              Atom = 0x18206
+        Li                  Atom = 0x1202
+        Link                Atom = 0x12804
+        List                Atom = 0x44e04
+        Listing             Atom = 0x44e07
+        Loop                Atom = 0xf404
+        Low                 Atom = 0x11f03
+        Malignmark          Atom = 0x100a
+        Manifest            Atom = 0x5f108
+        Map                 Atom = 0x2b203
+        Mark                Atom = 0x1604
+        Marquee             Atom = 0x2cb07
+        Math                Atom = 0x2d204
+        Max                 Atom = 0x2e103
+        Maxlength           Atom = 0x2e109
+        Media               Atom = 0x6e05
+        Mediagroup          Atom = 0x6e0a
+        Menu                Atom = 0x33804
+        Menuitem            Atom = 0x33808
+        Meta                Atom = 0x45d04
+        Meter               Atom = 0x24205
+        Method              Atom = 0x22c06
+        Mglyph              Atom = 0x2a206
+        Mi                  Atom = 0x2eb02
+        Min                 Atom = 0x2eb03
+        Minlength           Atom = 0x2eb09
+        Mn                  Atom = 0x23502
+        Mo                  Atom = 0x3ed02
+        Ms                  Atom = 0x2bc02
+        Mtext               Atom = 0x2f505
+        Multiple            Atom = 0x30308
+        Muted               Atom = 0x30b05
+        Name                Atom = 0x6c04
+        Nav                 Atom = 0x3e03
+        Nobr                Atom = 0x5704
+        Noembed             Atom = 0x6307
+        Noframes            Atom = 0x9808
+        Noscript            Atom = 0x3d208
+        Novalidate          Atom = 0x2360a
+        Object              Atom = 0x1ec06
+        Ol                  Atom = 0xc902
+        Onabort             Atom = 0x13a07
+        Onafterprint        Atom = 0x1c00c
+        Onautocomplete      Atom = 0x1fa0e
+        Onautocompleteerror Atom = 0x1fa13
+        Onbeforeprint       Atom = 0x6040d
+        Onbeforeunload      Atom = 0x4e70e
+        Onblur              Atom = 0xaa06
+        Oncancel            Atom = 0xe908
+        Oncanplay           Atom = 0x28509
+        Oncanplaythrough    Atom = 0x28510
+        Onchange            Atom = 0x3a708
+        Onclick             Atom = 0x31007
+        Onclose             Atom = 0x31707
+        Oncontextmenu       Atom = 0x32f0d
+        Oncuechange         Atom = 0x3420b
+        Ondblclick          Atom = 0x34d0a
+        Ondrag              Atom = 0x35706
+        Ondragend           Atom = 0x35709
+        Ondragenter         Atom = 0x3600b
+        Ondragleave         Atom = 0x36b0b
+        Ondragover          Atom = 0x3760a
+        Ondragstart         Atom = 0x3800b
+        Ondrop              Atom = 0x38f06
+        Ondurationchange    Atom = 0x39f10
+        Onemptied           Atom = 0x39609
+        Onended             Atom = 0x3af07
+        Onerror             Atom = 0x3b607
+        Onfocus             Atom = 0x3bd07
+        Onhashchange        Atom = 0x3da0c
+        Oninput             Atom = 0x3e607
+        Oninvalid           Atom = 0x3f209
+        Onkeydown           Atom = 0x3fb09
+        Onkeypress          Atom = 0x4080a
+        Onkeyup             Atom = 0x41807
+        Onlanguagechange    Atom = 0x43210
+        Onload              Atom = 0x44206
+        Onloadeddata        Atom = 0x4420c
+        Onloadedmetadata    Atom = 0x45510
+        Onloadstart         Atom = 0x46b0b
+        Onmessage           Atom = 0x47609
+        Onmousedown         Atom = 0x47f0b
+        Onmousemove         Atom = 0x48a0b
+        Onmouseout          Atom = 0x4950a
+        Onmouseover         Atom = 0x4a20b
+        Onmouseup           Atom = 0x4ad09
+        Onmousewheel        Atom = 0x4b60c
+        Onoffline           Atom = 0x4c209
+        Ononline            Atom = 0x4cb08
+        Onpagehide          Atom = 0x4d30a
+        Onpageshow          Atom = 0x4fe0a
+        Onpause             Atom = 0x50d07
+        Onplay              Atom = 0x51706
+        Onplaying           Atom = 0x51709
+        Onpopstate          Atom = 0x5200a
+        Onprogress          Atom = 0x52a0a
+        Onratechange        Atom = 0x53e0c
+        Onreset             Atom = 0x54a07
+        Onresize            Atom = 0x55108
+        Onscroll            Atom = 0x55f08
+        Onseeked            Atom = 0x56708
+        Onseeking           Atom = 0x56f09
+        Onselect            Atom = 0x57808
+        Onshow              Atom = 0x58206
+        Onsort              Atom = 0x58b06
+        Onstalled           Atom = 0x59509
+        Onstorage           Atom = 0x59e09
+        Onsubmit            Atom = 0x5a708
+        Onsuspend           Atom = 0x5bb09
+        Ontimeupdate        Atom = 0xdb0c
+        Ontoggle            Atom = 0x5c408
+        Onunload            Atom = 0x5cc08
+        Onvolumechange      Atom = 0x5d40e
+        Onwaiting           Atom = 0x5e209
+        Open                Atom = 0x3cf04
+        Optgroup            Atom = 0xf608
+        Optimum             Atom = 0x5eb07
+        Option              Atom = 0x60006
+        Output              Atom = 0x49c06
+        P                   Atom = 0xc01
+        Param               Atom = 0xc05
+        Pattern             Atom = 0x5107
+        Ping                Atom = 0x7704
+        Placeholder         Atom = 0xc30b
+        Plaintext           Atom = 0xfd09
+        Poster              Atom = 0x15706
+        Pre                 Atom = 0x25e03
+        Preload             Atom = 0x25e07
+        Progress            Atom = 0x52c08
+        Prompt              Atom = 0x5fa06
+        Public              Atom = 0x41e06
+        Q                   Atom = 0x13101
+        Radiogroup          Atom = 0x30a
+        Readonly            Atom = 0x2fb08
+        Rel                 Atom = 0x25f03
+        Required            Atom = 0x1d008
+        Reversed            Atom = 0x5a08
+        Rows                Atom = 0x9204
+        Rowspan             Atom = 0x9207
+        Rp                  Atom = 0x1c602
+        Rt                  Atom = 0x13f02
+        Ruby                Atom = 0xaf04
+        S                   Atom = 0x2c01
+        Samp                Atom = 0x4e04
+        Sandbox             Atom = 0xbb07
+        Scope               Atom = 0x2bd05
+        Scoped              Atom = 0x2bd06
+        Script              Atom = 0x3d406
+        Seamless            Atom = 0x31c08
+        Section             Atom = 0x4e207
+        Select              Atom = 0x57a06
+        Selected            Atom = 0x57a08
+        Shape               Atom = 0x4f905
+        Size                Atom = 0x55504
+        Sizes               Atom = 0x55505
+        Small               Atom = 0x18f05
+        Sortable            Atom = 0x58d08
+        Sorted              Atom = 0x19906
+        Source              Atom = 0x1aa06
+        Spacer              Atom = 0x2db06
+        Span                Atom = 0x9504
+        Spellcheck          Atom = 0x3230a
+        Src                 Atom = 0x3c303
+        Srcdoc              Atom = 0x3c306
+        Srclang             Atom = 0x41107
+        Start               Atom = 0x38605
+        Step                Atom = 0x5f704
+        Strike              Atom = 0x53306
+        Strong              Atom = 0x55906
+        Style               Atom = 0x61105
+        Sub                 Atom = 0x5a903
+        Summary             Atom = 0x61607
+        Sup                 Atom = 0x61d03
+        Svg                 Atom = 0x62003
+        System              Atom = 0x62306
+        Tabindex            Atom = 0x46308
+        Table               Atom = 0x42d05
+        Target              Atom = 0x24b06
+        Tbody               Atom = 0x2e05
+        Td                  Atom = 0x4702
+        Template            Atom = 0x62608
+        Textarea            Atom = 0x2f608
+        Tfoot               Atom = 0x8c05
+        Th                  Atom = 0x22e02
+        Thead               Atom = 0x2d405
+        Time                Atom = 0xdd04
+        Title               Atom = 0xa105
+        Tr                  Atom = 0x10502
+        Track               Atom = 0x10505
+        Translate           Atom = 0x14009
+        Tt                  Atom = 0x5302
+        Type                Atom = 0x21404
+        Typemustmatch       Atom = 0x2140d
+        U                   Atom = 0xb01
+        Ul                  Atom = 0x8a02
+        Usemap              Atom = 0x51106
+        Value               Atom = 0x4005
+        Var                 Atom = 0x11503
+        Video               Atom = 0x28105
+        Wbr                 Atom = 0x12103
+        Width               Atom = 0x50705
+        Wrap                Atom = 0x58704
+        Xmp                 Atom = 0xc103
+)
+
+const hash0 = 0xc17da63e
+
+const maxAtomLen = 19
+
+var table = [1 << 9]Atom{
+        0x1:   0x48a0b, // onmousemove
+        0x2:   0x5e209, // onwaiting
+        0x3:   0x1fa13, // onautocompleteerror
+        0x4:   0x5fa06, // prompt
+        0x7:   0x5eb07, // optimum
+        0x8:   0x1604,  // mark
+        0xa:   0x5ad07, // itemref
+        0xb:   0x4fe0a, // onpageshow
+        0xc:   0x57a06, // select
+        0xd:   0x17b09, // draggable
+        0xe:   0x3e03,  // nav
+        0xf:   0x17507, // command
+        0x11:  0xb01,   // u
+        0x14:  0x2d507, // headers
+        0x15:  0x44a08, // datalist
+        0x17:  0x4e04,  // samp
+        0x1a:  0x3fb09, // onkeydown
+        0x1b:  0x55f08, // onscroll
+        0x1c:  0x15003, // col
+        0x20:  0x3c908, // itemprop
+        0x21:  0x2780a, // http-equiv
+        0x22:  0x61d03, // sup
+        0x24:  0x1d008, // required
+        0x2b:  0x25e07, // preload
+        0x2c:  0x6040d, // onbeforeprint
+        0x2d:  0x3600b, // ondragenter
+        0x2e:  0x50902, // dt
+        0x2f:  0x5a708, // onsubmit
+        0x30:  0x27002, // hr
+        0x31:  0x32f0d, // oncontextmenu
+        0x33:  0x29c05, // image
+        0x34:  0x50d07, // onpause
+        0x35:  0x25906, // hgroup
+        0x36:  0x7704,  // ping
+        0x37:  0x57808, // onselect
+        0x3a:  0x11303, // div
+        0x3b:  0x1fa0e, // onautocomplete
+        0x40:  0x2eb02, // mi
+        0x41:  0x31c08, // seamless
+        0x42:  0x2807,  // charset
+        0x43:  0x8502,  // id
+        0x44:  0x5200a, // onpopstate
+        0x45:  0x3ef03, // del
+        0x46:  0x2cb07, // marquee
+        0x47:  0x3309,  // accesskey
+        0x49:  0x8d06,  // footer
+        0x4a:  0x44e04, // list
+        0x4b:  0x2b005, // ismap
+        0x51:  0x33804, // menu
+        0x52:  0x2f04,  // body
+        0x55:  0x9a08,  // frameset
+        0x56:  0x54a07, // onreset
+        0x57:  0x12705, // blink
+        0x58:  0xa105,  // title
+        0x59:  0x38807, // article
+        0x5b:  0x22e02, // th
+        0x5d:  0x13101, // q
+        0x5e:  0x3cf04, // open
+        0x5f:  0x2fa04, // area
+        0x61:  0x44206, // onload
+        0x62:  0xda04,  // font
+        0x63:  0xd604,  // base
+        0x64:  0x16207, // colspan
+        0x65:  0x53707, // keytype
+        0x66:  0x11e02, // dl
+        0x68:  0x1b008, // fieldset
+        0x6a:  0x2eb03, // min
+        0x6b:  0x11503, // var
+        0x6f:  0x2d506, // header
+        0x70:  0x13f02, // rt
+        0x71:  0x15008, // colgroup
+        0x72:  0x23502, // mn
+        0x74:  0x13a07, // onabort
+        0x75:  0x3906,  // keygen
+        0x76:  0x4c209, // onoffline
+        0x77:  0x21f09, // challenge
+        0x78:  0x2b203, // map
+        0x7a:  0x2e902, // h4
+        0x7b:  0x3b607, // onerror
+        0x7c:  0x2e109, // maxlength
+        0x7d:  0x2f505, // mtext
+        0x7e:  0xbb07,  // sandbox
+        0x7f:  0x58b06, // onsort
+        0x80:  0x100a,  // malignmark
+        0x81:  0x45d04, // meta
+        0x82:  0x7b05,  // async
+        0x83:  0x2a702, // h3
+        0x84:  0x26702, // dd
+        0x85:  0x27004, // href
+        0x86:  0x6e0a,  // mediagroup
+        0x87:  0x19406, // coords
+        0x88:  0x41107, // srclang
+        0x89:  0x34d0a, // ondblclick
+        0x8a:  0x4005,  // value
+        0x8c:  0xe908,  // oncancel
+        0x8e:  0x3230a, // spellcheck
+        0x8f:  0x9a05,  // frame
+        0x91:  0x12403, // big
+        0x94:  0x1f606, // action
+        0x95:  0x6903,  // dir
+        0x97:  0x2fb08, // readonly
+        0x99:  0x42d05, // table
+        0x9a:  0x61607, // summary
+        0x9b:  0x12103, // wbr
+        0x9c:  0x30a,   // radiogroup
+        0x9d:  0x6c04,  // name
+        0x9f:  0x62306, // system
+        0xa1:  0x15d05, // color
+        0xa2:  0x7f06,  // canvas
+        0xa3:  0x25504, // html
+        0xa5:  0x56f09, // onseeking
+        0xac:  0x4f905, // shape
+        0xad:  0x25f03, // rel
+        0xae:  0x28510, // oncanplaythrough
+        0xaf:  0x3760a, // ondragover
+        0xb0:  0x62608, // template
+        0xb1:  0x1d80d, // foreignObject
+        0xb3:  0x9204,  // rows
+        0xb6:  0x44e07, // listing
+        0xb7:  0x49c06, // output
+        0xb9:  0x3310b, // contextmenu
+        0xbb:  0x11f03, // low
+        0xbc:  0x1c602, // rp
+        0xbd:  0x5bb09, // onsuspend
+        0xbe:  0x13606, // button
+        0xbf:  0x4db04, // desc
+        0xc1:  0x4e207, // section
+        0xc2:  0x52a0a, // onprogress
+        0xc3:  0x59e09, // onstorage
+        0xc4:  0x2d204, // math
+        0xc5:  0x4503,  // alt
+        0xc7:  0x8a02,  // ul
+        0xc8:  0x5107,  // pattern
+        0xc9:  0x4b60c, // onmousewheel
+        0xca:  0x35709, // ondragend
+        0xcb:  0xaf04,  // ruby
+        0xcc:  0xc01,   // p
+        0xcd:  0x31707, // onclose
+        0xce:  0x24205, // meter
+        0xcf:  0x11807, // bgsound
+        0xd2:  0x25106, // height
+        0xd4:  0x101,   // b
+        0xd5:  0x2c308, // itemtype
+        0xd8:  0x1bb07, // caption
+        0xd9:  0x10c08, // disabled
+        0xdb:  0x33808, // menuitem
+        0xdc:  0x62003, // svg
+        0xdd:  0x18f05, // small
+        0xde:  0x44a04, // data
+        0xe0:  0x4cb08, // ononline
+        0xe1:  0x2a206, // mglyph
+        0xe3:  0x6505,  // embed
+        0xe4:  0x10502, // tr
+        0xe5:  0x46b0b, // onloadstart
+        0xe7:  0x3c306, // srcdoc
+        0xeb:  0x5c408, // ontoggle
+        0xed:  0xe703,  // bdo
+        0xee:  0x4702,  // td
+        0xef:  0x8305,  // aside
+        0xf0:  0x29402, // h2
+        0xf1:  0x52c08, // progress
+        0xf2:  0x12c0a, // blockquote
+        0xf4:  0xf005,  // label
+        0xf5:  0x601,   // i
+        0xf7:  0x9207,  // rowspan
+        0xfb:  0x51709, // onplaying
+        0xfd:  0x2a103, // img
+        0xfe:  0xf608,  // optgroup
+        0xff:  0x42307, // content
+        0x101: 0x53e0c, // onratechange
+        0x103: 0x3da0c, // onhashchange
+        0x104: 0x4807,  // details
+        0x106: 0x40008, // download
+        0x109: 0x14009, // translate
+        0x10b: 0x4230f, // contenteditable
+        0x10d: 0x36b0b, // ondragleave
+        0x10e: 0x2106,  // accept
+        0x10f: 0x57a08, // selected
+        0x112: 0x1f20a, // formaction
+        0x113: 0x5b506, // center
+        0x115: 0x45510, // onloadedmetadata
+        0x116: 0x12804, // link
+        0x117: 0xdd04,  // time
+        0x118: 0x19f0b, // crossorigin
+        0x119: 0x3bd07, // onfocus
+        0x11a: 0x58704, // wrap
+        0x11b: 0x42204, // icon
+        0x11d: 0x28105, // video
+        0x11e: 0x4de05, // class
+        0x121: 0x5d40e, // onvolumechange
+        0x122: 0xaa06,  // onblur
+        0x123: 0x2b909, // itemscope
+        0x124: 0x61105, // style
+        0x127: 0x41e06, // public
+        0x129: 0x2320e, // formnovalidate
+        0x12a: 0x58206, // onshow
+        0x12c: 0x51706, // onplay
+        0x12d: 0x3c804, // cite
+        0x12e: 0x2bc02, // ms
+        0x12f: 0xdb0c,  // ontimeupdate
+        0x130: 0x10904, // kind
+        0x131: 0x2470a, // formtarget
+        0x135: 0x3af07, // onended
+        0x136: 0x26506, // hidden
+        0x137: 0x2c01,  // s
+        0x139: 0x2280a, // formmethod
+        0x13a: 0x3e805, // input
+        0x13c: 0x50b02, // h6
+        0x13d: 0xc902,  // ol
+        0x13e: 0x3420b, // oncuechange
+        0x13f: 0x1e50d, // foreignobject
+        0x143: 0x4e70e, // onbeforeunload
+        0x144: 0x2bd05, // scope
+        0x145: 0x39609, // onemptied
+        0x146: 0x14b05, // defer
+        0x147: 0xc103,  // xmp
+        0x148: 0x39f10, // ondurationchange
+        0x149: 0x1903,  // kbd
+        0x14c: 0x47609, // onmessage
+        0x14d: 0x60006, // option
+        0x14e: 0x2eb09, // minlength
+        0x14f: 0x32807, // checked
+        0x150: 0xce08,  // autoplay
+        0x152: 0x202,   // br
+        0x153: 0x2360a, // novalidate
+        0x156: 0x6307,  // noembed
+        0x159: 0x31007, // onclick
+        0x15a: 0x47f0b, // onmousedown
+        0x15b: 0x3a708, // onchange
+        0x15e: 0x3f209, // oninvalid
+        0x15f: 0x2bd06, // scoped
+        0x160: 0x18808, // controls
+        0x161: 0x30b05, // muted
+        0x162: 0x58d08, // sortable
+        0x163: 0x51106, // usemap
+        0x164: 0x1b80a, // figcaption
+        0x165: 0x35706, // ondrag
+        0x166: 0x26b04, // high
+        0x168: 0x3c303, // src
+        0x169: 0x15706, // poster
+        0x16b: 0x1670e, // annotation-xml
+        0x16c: 0x5f704, // step
+        0x16d: 0x4,     // abbr
+        0x16e: 0x1b06,  // dialog
+        0x170: 0x1202,  // li
+        0x172: 0x3ed02, // mo
+        0x175: 0x1d803, // for
+        0x176: 0x1a803, // ins
+        0x178: 0x55504, // size
+        0x179: 0x43210, // onlanguagechange
+        0x17a: 0x8607,  // default
+        0x17b: 0x1a03,  // bdi
+        0x17c: 0x4d30a, // onpagehide
+        0x17d: 0x6907,  // dirname
+        0x17e: 0x21404, // type
+        0x17f: 0x1f204, // form
+        0x181: 0x28509, // oncanplay
+        0x182: 0x6103,  // dfn
+        0x183: 0x46308, // tabindex
+        0x186: 0x6502,  // em
+        0x187: 0x27404, // lang
+        0x189: 0x39108, // dropzone
+        0x18a: 0x4080a, // onkeypress
+        0x18b: 0x23c08, // datetime
+        0x18c: 0x16204, // cols
+        0x18d: 0x1,     // a
+        0x18e: 0x4420c, // onloadeddata
+        0x190: 0xa605,  // audio
+        0x192: 0x2e05,  // tbody
+        0x193: 0x22c06, // method
+        0x195: 0xf404,  // loop
+        0x196: 0x29606, // iframe
+        0x198: 0x2d504, // head
+        0x19e: 0x5f108, // manifest
+        0x19f: 0xb309,  // autofocus
+        0x1a0: 0x14904, // code
+        0x1a1: 0x55906, // strong
+        0x1a2: 0x30308, // multiple
+        0x1a3: 0xc05,   // param
+        0x1a6: 0x21107, // enctype
+        0x1a7: 0x5b304, // face
+        0x1a8: 0xfd09,  // plaintext
+        0x1a9: 0x26e02, // h1
+        0x1aa: 0x59509, // onstalled
+        0x1ad: 0x3d406, // script
+        0x1ae: 0x2db06, // spacer
+        0x1af: 0x55108, // onresize
+        0x1b0: 0x4a20b, // onmouseover
+        0x1b1: 0x5cc08, // onunload
+        0x1b2: 0x56708, // onseeked
+        0x1b4: 0x2140d, // typemustmatch
+        0x1b5: 0x1cc06, // figure
+        0x1b6: 0x4950a, // onmouseout
+        0x1b7: 0x25e03, // pre
+        0x1b8: 0x50705, // width
+        0x1b9: 0x19906, // sorted
+        0x1bb: 0x5704,  // nobr
+        0x1be: 0x5302,  // tt
+        0x1bf: 0x1105,  // align
+        0x1c0: 0x3e607, // oninput
+        0x1c3: 0x41807, // onkeyup
+        0x1c6: 0x1c00c, // onafterprint
+        0x1c7: 0x210e,  // accept-charset
+        0x1c8: 0x33c06, // itemid
+        0x1c9: 0x3e809, // inputmode
+        0x1cb: 0x53306, // strike
+        0x1cc: 0x5a903, // sub
+        0x1cd: 0x10505, // track
+        0x1ce: 0x38605, // start
+        0x1d0: 0xd608,  // basefont
+        0x1d6: 0x1aa06, // source
+        0x1d7: 0x18206, // legend
+        0x1d8: 0x2d405, // thead
+        0x1da: 0x8c05,  // tfoot
+        0x1dd: 0x1ec06, // object
+        0x1de: 0x6e05,  // media
+        0x1df: 0x1670a, // annotation
+        0x1e0: 0x20d0b, // formenctype
+        0x1e2: 0x3d208, // noscript
+        0x1e4: 0x55505, // sizes
+        0x1e5: 0x1fc0c, // autocomplete
+        0x1e6: 0x9504,  // span
+        0x1e7: 0x9808,  // noframes
+        0x1e8: 0x24b06, // target
+        0x1e9: 0x38f06, // ondrop
+        0x1ea: 0x2b306, // applet
+        0x1ec: 0x5a08,  // reversed
+        0x1f0: 0x2a907, // isindex
+        0x1f3: 0x27008, // hreflang
+        0x1f5: 0x2f302, // h5
+        0x1f6: 0x4f307, // address
+        0x1fa: 0x2e103, // max
+        0x1fb: 0xc30b,  // placeholder
+        0x1fc: 0x2f608, // textarea
+        0x1fe: 0x4ad09, // onmouseup
+        0x1ff: 0x3800b, // ondragstart
+}
+
+const atomText = "abbradiogrouparamalignmarkbdialogaccept-charsetbodyaccesskey" +
+        "genavaluealtdetailsampatternobreversedfnoembedirnamediagroup" +
+        "ingasyncanvasidefaultfooterowspanoframesetitleaudionblurubya" +
+        "utofocusandboxmplaceholderautoplaybasefontimeupdatebdoncance" +
+        "labelooptgrouplaintextrackindisabledivarbgsoundlowbrbigblink" +
+        "blockquotebuttonabortranslatecodefercolgroupostercolorcolspa" +
+        "nnotation-xmlcommandraggablegendcontrolsmallcoordsortedcross" +
+        "originsourcefieldsetfigcaptionafterprintfigurequiredforeignO" +
+        "bjectforeignobjectformactionautocompleteerrorformenctypemust" +
+        "matchallengeformmethodformnovalidatetimeterformtargetheightm" +
+        "lhgroupreloadhiddenhigh1hreflanghttp-equivideoncanplaythroug" +
+        "h2iframeimageimglyph3isindexismappletitemscopeditemtypemarqu" +
+        "eematheaderspacermaxlength4minlength5mtextareadonlymultiplem" +
+        "utedonclickoncloseamlesspellcheckedoncontextmenuitemidoncuec" +
+        "hangeondblclickondragendondragenterondragleaveondragoverondr" +
+        "agstarticleondropzonemptiedondurationchangeonendedonerroronf" +
+        "ocusrcdocitempropenoscriptonhashchangeoninputmodeloninvalido" +
+        "nkeydownloadonkeypressrclangonkeyupublicontenteditableonlang" +
+        "uagechangeonloadeddatalistingonloadedmetadatabindexonloadsta" +
+        "rtonmessageonmousedownonmousemoveonmouseoutputonmouseoveronm" +
+        "ouseuponmousewheelonofflineononlineonpagehidesclassectionbef" +
+        "oreunloaddresshapeonpageshowidth6onpausemaponplayingonpopsta" +
+        "teonprogresstrikeytypeonratechangeonresetonresizestrongonscr" +
+        "ollonseekedonseekingonselectedonshowraponsortableonstalledon" +
+        "storageonsubmitemrefacenteronsuspendontoggleonunloadonvolume" +
+        "changeonwaitingoptimumanifestepromptoptionbeforeprintstylesu" +
+        "mmarysupsvgsystemplate"
diff --git a/vendor/golang.org/x/net/html/const.go b/vendor/golang.org/x/net/html/const.go
new file mode 100644
index 0000000..52f651f
--- /dev/null
+++ b/vendor/golang.org/x/net/html/const.go
@@ -0,0 +1,102 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package html
+
+// Section 12.2.3.2 of the HTML5 specification says "The following elements
+// have varying levels of special parsing rules".
+// https://html.spec.whatwg.org/multipage/syntax.html#the-stack-of-open-elements
+var isSpecialElementMap = map[string]bool{
+        "address":    true,
+        "applet":     true,
+        "area":       true,
+        "article":    true,
+        "aside":      true,
+        "base":       true,
+        "basefont":   true,
+        "bgsound":    true,
+        "blockquote": true,
+        "body":       true,
+        "br":         true,
+        "button":     true,
+        "caption":    true,
+        "center":     true,
+        "col":        true,
+        "colgroup":   true,
+        "dd":         true,
+        "details":    true,
+        "dir":        true,
+        "div":        true,
+        "dl":         true,
+        "dt":         true,
+        "embed":      true,
+        "fieldset":   true,
+        "figcaption": true,
+        "figure":     true,
+        "footer":     true,
+        "form":       true,
+        "frame":      true,
+        "frameset":   true,
+        "h1":         true,
+        "h2":         true,
+        "h3":         true,
+        "h4":         true,
+        "h5":         true,
+        "h6":         true,
+        "head":       true,
+        "header":     true,
+        "hgroup":     true,
+        "hr":         true,
+        "html":       true,
+        "iframe":     true,
+        "img":        true,
+        "input":      true,
+        "isindex":    true,
+        "li":         true,
+        "link":       true,
+        "listing":    true,
+        "marquee":    true,
+        "menu":       true,
+        "meta":       true,
+        "nav":        true,
+        "noembed":    true,
+        "noframes":   true,
+        "noscript":   true,
+        "object":     true,
+        "ol":         true,
+        "p":          true,
+        "param":      true,
+        "plaintext":  true,
+        "pre":        true,
+        "script":     true,
+        "section":    true,
+        "select":     true,
+        "source":     true,
+        "style":      true,
+        "summary":    true,
+        "table":      true,
+        "tbody":      true,
+        "td":         true,
+        "template":   true,
+        "textarea":   true,
+        "tfoot":      true,
+        "th":         true,
+        "thead":      true,
+        "title":      true,
+        "tr":         true,
+        "track":      true,
+        "ul":         true,
+        "wbr":        true,
+        "xmp":        true,
+}
+
+func isSpecialElement(element *Node) bool {
+        switch element.Namespace {
+        case "", "html":
+                return isSpecialElementMap[element.Data]
+        case "svg":
+                return element.Data == "foreignObject"
+        }
+        return false
+}
diff --git a/vendor/golang.org/x/net/html/doc.go b/vendor/golang.org/x/net/html/doc.go
new file mode 100644
index 0000000..94f4968
--- /dev/null
+++ b/vendor/golang.org/x/net/html/doc.go
@@ -0,0 +1,106 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+Package html implements an HTML5-compliant tokenizer and parser.
+
+Tokenization is done by creating a Tokenizer for an io.Reader r. It is the
+caller's responsibility to ensure that r provides UTF-8 encoded HTML.
+
+        z := html.NewTokenizer(r)
+
+Given a Tokenizer z, the HTML is tokenized by repeatedly calling z.Next(),
+which parses the next token and returns its type, or an error:
+
+        for {
+                tt := z.Next()
+                if tt == html.ErrorToken {
+                        // ...
+                        return ...
+                }
+                // Process the current token.
+        }
+
+There are two APIs for retrieving the current token. The high-level API is to
+call Token; the low-level API is to call Text or TagName / TagAttr. Both APIs
+allow optionally calling Raw after Next but before Token, Text, TagName, or
+TagAttr. In EBNF notation, the valid call sequence per token is:
+
+        Next {Raw} [ Token | Text | TagName {TagAttr} ]
+
+Token returns an independent data structure that completely describes a token.
+Entities (such as "&lt;") are unescaped, tag names and attribute keys are
+lower-cased, and attributes are collected into a []Attribute. For example:
+
+        for {
+                if z.Next() == html.ErrorToken {
+                        // Returning io.EOF indicates success.
+                        return z.Err()
+                }
+                emitToken(z.Token())
+        }
+
+The low-level API performs fewer allocations and copies, but the contents of
+the []byte values returned by Text, TagName and TagAttr may change on the next
+call to Next. For example, to extract an HTML page's anchor text:
+
+        depth := 0
+        for {
+                tt := z.Next()
+                switch tt {
+                case ErrorToken:
+                        return z.Err()
+                case TextToken:
+                        if depth > 0 {
+                                // emitBytes should copy the []byte it receives,
+                                // if it doesn't process it immediately.
+                                emitBytes(z.Text())
+                        }
+                case StartTagToken, EndTagToken:
+                        tn, _ := z.TagName()
+                        if len(tn) == 1 && tn[0] == 'a' {
+                                if tt == StartTagToken {
+                                        depth++
+                                } else {
+                                        depth--
+                                }
+                        }
+                }
+        }
+
+Parsing is done by calling Parse with an io.Reader, which returns the root of
+the parse tree (the document element) as a *Node. It is the caller's
+responsibility to ensure that the Reader provides UTF-8 encoded HTML. For
+example, to process each anchor node in depth-first order:
+
+        doc, err := html.Parse(r)
+        if err != nil {
+                // ...
+        }
+        var f func(*html.Node)
+        f = func(n *html.Node) {
+                if n.Type == html.ElementNode && n.Data == "a" {
+                        // Do something with n...
+                }
+                for c := n.FirstChild; c != nil; c = c.NextSibling {
+                        f(c)
+                }
+        }
+        f(doc)
+
+The relevant specifications include:
+https://html.spec.whatwg.org/multipage/syntax.html and
+https://html.spec.whatwg.org/multipage/syntax.html#tokenization
+*/
+package html // import "golang.org/x/net/html"
+
+// The tokenization algorithm implemented by this package is not a line-by-line
+// transliteration of the relatively verbose state-machine in the WHATWG
+// specification. A more direct approach is used instead, where the program
+// counter implies the state, such as whether it is tokenizing a tag or a text
+// node. Specification compliance is verified by checking expected and actual
+// outputs over a test suite rather than aiming for algorithmic fidelity.
+
+// TODO(nigeltao): Does a DOM API belong in this package or a separate one?
+// TODO(nigeltao): How does parsing interact with a JavaScript engine?
diff --git a/vendor/golang.org/x/net/html/doctype.go b/vendor/golang.org/x/net/html/doctype.go
new file mode 100644
index 0000000..c484e5a
--- /dev/null
+++ b/vendor/golang.org/x/net/html/doctype.go
@@ -0,0 +1,156 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package html
+
+import (
+        "strings"
+)
+
+// parseDoctype parses the data from a DoctypeToken into a name,
+// public identifier, and system identifier. It returns a Node whose Type
+// is DoctypeNode, whose Data is the name, and which has attributes
+// named "system" and "public" for the two identifiers if they were present.
+// quirks is whether the document should be parsed in "quirks mode".
+func parseDoctype(s string) (n *Node, quirks bool) {
+        n = &Node{Type: DoctypeNode}
+
+        // Find the name.
+        space := strings.IndexAny(s, whitespace)
+        if space == -1 {
+                space = len(s)
+        }
+        n.Data = s[:space]
+        // The comparison to "html" is case-sensitive.
+        if n.Data != "html" {
+                quirks = true
+        }
+        n.Data = strings.ToLower(n.Data)
+        s = strings.TrimLeft(s[space:], whitespace)
+
+        if len(s) < 6 {
+                // It can't start with "PUBLIC" or "SYSTEM".
+                // Ignore the rest of the string.
+                return n, quirks || s != ""
+        }
+
+        key := strings.ToLower(s[:6])
+        s = s[6:]
+        for key == "public" || key == "system" {
+                s = strings.TrimLeft(s, whitespace)
+                if s == "" {
+                        break
+                }
+                quote := s[0]
+                if quote != '"' && quote != '\'' {
+                        break
+                }
+                s = s[1:]
+                q := strings.IndexRune(s, rune(quote))
+                var id string
+                if q == -1 {
+                        id = s
+                        s = ""
+                } else {
+                        id = s[:q]
+                        s = s[q+1:]
+                }
+                n.Attr = append(n.Attr, Attribute{Key: key, Val: id})
+                if key == "public" {
+                        key = "system"
+                } else {
+                        key = ""
+                }
+        }
+
+        if key != "" || s != "" {
+                quirks = true
+        } else if len(n.Attr) > 0 {
+                if n.Attr[0].Key == "public" {
+                        public := strings.ToLower(n.Attr[0].Val)
+                        switch public {
+                        case "-//w3o//dtd w3 html strict 3.0//en//", "-/w3d/dtd html 4.0 transitional/en", "html":
+                                quirks = true
+                        default:
+                                for _, q := range quirkyIDs {
+                                        if strings.HasPrefix(public, q) {
+                                                quirks = true
+                                                break
+                                        }
+                                }
+                        }
+                        // The following two public IDs only cause quirks mode if there is no system ID.
+                        if len(n.Attr) == 1 && (strings.HasPrefix(public, "-//w3c//dtd html 4.01 frameset//") ||
+                                strings.HasPrefix(public, "-//w3c//dtd html 4.01 transitional//")) {
+                                quirks = true
+                        }
+                }
+                if lastAttr := n.Attr[len(n.Attr)-1]; lastAttr.Key == "system" &&
+                        strings.ToLower(lastAttr.Val) == "http://www.ibm.com/data/dtd/v11/ibmxhtml1-transitional.dtd" {
+                        quirks = true
+                }
+        }
+
+        return n, quirks
+}
+
+// quirkyIDs is a list of public doctype identifiers that cause a document
+// to be interpreted in quirks mode. The identifiers should be in lower case.
+var quirkyIDs = []string{
+        "+//silmaril//dtd html pro v0r11 19970101//",
+        "-//advasoft ltd//dtd html 3.0 aswedit + extensions//",
+        "-//as//dtd html 3.0 aswedit + extensions//",
+        "-//ietf//dtd html 2.0 level 1//",
+        "-//ietf//dtd html 2.0 level 2//",
+        "-//ietf//dtd html 2.0 strict level 1//",
+        "-//ietf//dtd html 2.0 strict level 2//",
+        "-//ietf//dtd html 2.0 strict//",
+        "-//ietf//dtd html 2.0//",
+        "-//ietf//dtd html 2.1e//",
+        "-//ietf//dtd html 3.0//",
+        "-//ietf//dtd html 3.2 final//",
+        "-//ietf//dtd html 3.2//",
+        "-//ietf//dtd html 3//",
+        "-//ietf//dtd html level 0//",
+        "-//ietf//dtd html level 1//",
+        "-//ietf//dtd html level 2//",
+        "-//ietf//dtd html level 3//",
+        "-//ietf//dtd html strict level 0//",
+        "-//ietf//dtd html strict level 1//",
+        "-//ietf//dtd html strict level 2//",
+        "-//ietf//dtd html strict level 3//",
+        "-//ietf//dtd html strict//",
+        "-//ietf//dtd html//",
+        "-//metrius//dtd metrius presentational//",
+        "-//microsoft//dtd internet explorer 2.0 html strict//",
+        "-//microsoft//dtd internet explorer 2.0 html//",
+        "-//microsoft//dtd internet explorer 2.0 tables//",
+        "-//microsoft//dtd internet explorer 3.0 html strict//",
+        "-//microsoft//dtd internet explorer 3.0 html//",
+        "-//microsoft//dtd internet explorer 3.0 tables//",
+        "-//netscape comm. corp.//dtd html//",
+        "-//netscape comm. corp.//dtd strict html//",
+        "-//o'reilly and associates//dtd html 2.0//",
+        "-//o'reilly and associates//dtd html extended 1.0//",
+        "-//o'reilly and associates//dtd html extended relaxed 1.0//",
+        "-//softquad software//dtd hotmetal pro 6.0::19990601::extensions to html 4.0//",
+        "-//softquad//dtd hotmetal pro 4.0::19971010::extensions to html 4.0//",
+        "-//spyglass//dtd html 2.0 extended//",
+        "-//sq//dtd html 2.0 hotmetal + extensions//",
+        "-//sun microsystems corp.//dtd hotjava html//",
+        "-//sun microsystems corp.//dtd hotjava strict html//",
+        "-//w3c//dtd html 3 1995-03-24//",
+        "-//w3c//dtd html 3.2 draft//",
+        "-//w3c//dtd html 3.2 final//",
+        "-//w3c//dtd html 3.2//",
+        "-//w3c//dtd html 3.2s draft//",
+        "-//w3c//dtd html 4.0 frameset//",
+        "-//w3c//dtd html 4.0 transitional//",
+        "-//w3c//dtd html experimental 19960712//",
+        "-//w3c//dtd html experimental 970421//",
+        "-//w3c//dtd w3 html//",
+        "-//w3o//dtd w3 html 3.0//",
+        "-//webtechs//dtd mozilla html 2.0//",
+        "-//webtechs//dtd mozilla html//",
+}
diff --git a/vendor/golang.org/x/net/html/entity.go b/vendor/golang.org/x/net/html/entity.go
new file mode 100644
index 0000000..a50c04c
--- /dev/null
+++ b/vendor/golang.org/x/net/html/entity.go
@@ -0,0 +1,2253 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package html
+
+// All entities that do not end with ';' are 6 or fewer bytes long.
+const longestEntityWithoutSemicolon = 6
+
+// entity is a map from HTML entity names to their values. The semicolon matters:
+// https://html.spec.whatwg.org/multipage/syntax.html#named-character-references
+// lists both "amp" and "amp;" as two separate entries.
+//
+// Note that the HTML5 list is larger than the HTML4 list at
+// http://www.w3.org/TR/html4/sgml/entities.html
+var entity = map[string]rune{
+        "AElig;":                           '\U000000C6',
+        "AMP;":                             '\U00000026',
+        "Aacute;":                          '\U000000C1',
+        "Abreve;":                          '\U00000102',
+        "Acirc;":                           '\U000000C2',
+        "Acy;":                             '\U00000410',
+        "Afr;":                             '\U0001D504',
+        "Agrave;":                          '\U000000C0',
+        "Alpha;":                           '\U00000391',
+        "Amacr;":                           '\U00000100',
+        "And;":                             '\U00002A53',
+        "Aogon;":                           '\U00000104',
+        "Aopf;":                            '\U0001D538',
+        "ApplyFunction;":                   '\U00002061',
+        "Aring;":                           '\U000000C5',
+        "Ascr;":                            '\U0001D49C',
+        "Assign;":                          '\U00002254',
+        "Atilde;":                          '\U000000C3',
+        "Auml;":                            '\U000000C4',
+        "Backslash;":                       '\U00002216',
+        "Barv;":                            '\U00002AE7',
+        "Barwed;":                          '\U00002306',
+        "Bcy;":                             '\U00000411',
+        "Because;":                         '\U00002235',
+        "Bernoullis;":                      '\U0000212C',
+        "Beta;":                            '\U00000392',
+        "Bfr;":                             '\U0001D505',
+        "Bopf;":                            '\U0001D539',
+        "Breve;":                           '\U000002D8',
+        "Bscr;":                            '\U0000212C',
+        "Bumpeq;":                          '\U0000224E',
+        "CHcy;":                            '\U00000427',
+        "COPY;":                            '\U000000A9',
+        "Cacute;":                          '\U00000106',
+        "Cap;":                             '\U000022D2',
+        "CapitalDifferentialD;":            '\U00002145',
+        "Cayleys;":                         '\U0000212D',
+        "Ccaron;":                          '\U0000010C',
+        "Ccedil;":                          '\U000000C7',
+        "Ccirc;":                           '\U00000108',
+        "Cconint;":                         '\U00002230',
+        "Cdot;":                            '\U0000010A',
+        "Cedilla;":                         '\U000000B8',
+        "CenterDot;":                       '\U000000B7',
+        "Cfr;":                             '\U0000212D',
+        "Chi;":                             '\U000003A7',
+        "CircleDot;":                       '\U00002299',
+        "CircleMinus;":                     '\U00002296',
+        "CirclePlus;":                      '\U00002295',
+        "CircleTimes;":                     '\U00002297',
+        "ClockwiseContourIntegral;":        '\U00002232',
+        "CloseCurlyDoubleQuote;":           '\U0000201D',
+        "CloseCurlyQuote;":                 '\U00002019',
+        "Colon;":                           '\U00002237',
+        "Colone;":                          '\U00002A74',
+        "Congruent;":                       '\U00002261',
+        "Conint;":                          '\U0000222F',
+        "ContourIntegral;":                 '\U0000222E',
+        "Copf;":                            '\U00002102',
+        "Coproduct;":                       '\U00002210',
+        "CounterClockwiseContourIntegral;": '\U00002233',
+        "Cross;":                    '\U00002A2F',
+        "Cscr;":                     '\U0001D49E',
+        "Cup;":                      '\U000022D3',
+        "CupCap;":                   '\U0000224D',
+        "DD;":                       '\U00002145',
+        "DDotrahd;":                 '\U00002911',
+        "DJcy;":                     '\U00000402',
+        "DScy;":                     '\U00000405',
+        "DZcy;":                     '\U0000040F',
+        "Dagger;":                   '\U00002021',
+        "Darr;":                     '\U000021A1',
+        "Dashv;":                    '\U00002AE4',
+        "Dcaron;":                   '\U0000010E',
+        "Dcy;":                      '\U00000414',
+        "Del;":                      '\U00002207',
+        "Delta;":                    '\U00000394',
+        "Dfr;":                      '\U0001D507',
+        "DiacriticalAcute;":         '\U000000B4',
+        "DiacriticalDot;":           '\U000002D9',
+        "DiacriticalDoubleAcute;":   '\U000002DD',
+        "DiacriticalGrave;":         '\U00000060',
+        "DiacriticalTilde;":         '\U000002DC',
+        "Diamond;":                  '\U000022C4',
+        "DifferentialD;":            '\U00002146',
+        "Dopf;":                     '\U0001D53B',
+        "Dot;":                      '\U000000A8',
+        "DotDot;":                   '\U000020DC',
+        "DotEqual;":                 '\U00002250',
+        "DoubleContourIntegral;":    '\U0000222F',
+        "DoubleDot;":                '\U000000A8',
+        "DoubleDownArrow;":          '\U000021D3',
+        "DoubleLeftArrow;":          '\U000021D0',
+        "DoubleLeftRightArrow;":     '\U000021D4',
+        "DoubleLeftTee;":            '\U00002AE4',
+        "DoubleLongLeftArrow;":      '\U000027F8',
+        "DoubleLongLeftRightArrow;": '\U000027FA',
+        "DoubleLongRightArrow;":     '\U000027F9',
+        "DoubleRightArrow;":         '\U000021D2',
+        "DoubleRightTee;":           '\U000022A8',
+        "DoubleUpArrow;":            '\U000021D1',
+        "DoubleUpDownArrow;":        '\U000021D5',
+        "DoubleVerticalBar;":        '\U00002225',
+        "DownArrow;":                '\U00002193',
+        "DownArrowBar;":             '\U00002913',
+        "DownArrowUpArrow;":         '\U000021F5',
+        "DownBreve;":                '\U00000311',
+        "DownLeftRightVector;":      '\U00002950',
+        "DownLeftTeeVector;":        '\U0000295E',
+        "DownLeftVector;":           '\U000021BD',
+        "DownLeftVectorBar;":        '\U00002956',
+        "DownRightTeeVector;":       '\U0000295F',
+        "DownRightVector;":          '\U000021C1',
+        "DownRightVectorBar;":       '\U00002957',
+        "DownTee;":                  '\U000022A4',
+        "DownTeeArrow;":             '\U000021A7',
+        "Downarrow;":                '\U000021D3',
+        "Dscr;":                     '\U0001D49F',
+        "Dstrok;":                   '\U00000110',
+        "ENG;":                      '\U0000014A',
+        "ETH;":                      '\U000000D0',
+        "Eacute;":                   '\U000000C9',
+        "Ecaron;":                   '\U0000011A',
+        "Ecirc;":                    '\U000000CA',
+        "Ecy;":                      '\U0000042D',
+        "Edot;":                     '\U00000116',
+        "Efr;":                      '\U0001D508',
+        "Egrave;":                   '\U000000C8',
+        "Element;":                  '\U00002208',
+        "Emacr;":                    '\U00000112',
+        "EmptySmallSquare;":         '\U000025FB',
+        "EmptyVerySmallSquare;":     '\U000025AB',
+        "Eogon;":                    '\U00000118',
+        "Eopf;":                     '\U0001D53C',
+        "Epsilon;":                  '\U00000395',
+        "Equal;":                    '\U00002A75',
+        "EqualTilde;":               '\U00002242',
+        "Equilibrium;":              '\U000021CC',
+        "Escr;":                     '\U00002130',
+        "Esim;":                     '\U00002A73',
+        "Eta;":                      '\U00000397',
+        "Euml;":                     '\U000000CB',
+        "Exists;":                   '\U00002203',
+        "ExponentialE;":             '\U00002147',
+        "Fcy;":                      '\U00000424',
+        "Ffr;":                      '\U0001D509',
+        "FilledSmallSquare;":        '\U000025FC',
+        "FilledVerySmallSquare;":    '\U000025AA',
+        "Fopf;":                     '\U0001D53D',
+        "ForAll;":                   '\U00002200',
+        "Fouriertrf;":               '\U00002131',
+        "Fscr;":                     '\U00002131',
+        "GJcy;":                     '\U00000403',
+        "GT;":                       '\U0000003E',
+        "Gamma;":                    '\U00000393',
+        "Gammad;":                   '\U000003DC',
+        "Gbreve;":                   '\U0000011E',
+        "Gcedil;":                   '\U00000122',
+        "Gcirc;":                    '\U0000011C',
+        "Gcy;":                      '\U00000413',
+        "Gdot;":                     '\U00000120',
+        "Gfr;":                      '\U0001D50A',
+        "Gg;":                       '\U000022D9',
+        "Gopf;":                     '\U0001D53E',
+        "GreaterEqual;":             '\U00002265',
+        "GreaterEqualLess;":         '\U000022DB',
+        "GreaterFullEqual;":         '\U00002267',
+        "GreaterGreater;":           '\U00002AA2',
+        "GreaterLess;":              '\U00002277',
+        "GreaterSlantEqual;":        '\U00002A7E',
+        "GreaterTilde;":             '\U00002273',
+        "Gscr;":                     '\U0001D4A2',
+        "Gt;":                       '\U0000226B',
+        "HARDcy;":                   '\U0000042A',
+        "Hacek;":                    '\U000002C7',
+        "Hat;":                      '\U0000005E',
+        "Hcirc;":                    '\U00000124',
+        "Hfr;":                      '\U0000210C',
+        "HilbertSpace;":             '\U0000210B',
+        "Hopf;":                     '\U0000210D',
+        "HorizontalLine;":           '\U00002500',
+        "Hscr;":                     '\U0000210B',
+        "Hstrok;":                   '\U00000126',
+        "HumpDownHump;":             '\U0000224E',
+        "HumpEqual;":                '\U0000224F',
+        "IEcy;":                     '\U00000415',
+        "IJlig;":                    '\U00000132',
+        "IOcy;":                     '\U00000401',
+        "Iacute;":                   '\U000000CD',
+        "Icirc;":                    '\U000000CE',
+        "Icy;":                      '\U00000418',
+        "Idot;":                     '\U00000130',
+        "Ifr;":                      '\U00002111',
+        "Igrave;":                   '\U000000CC',
+        "Im;":                       '\U00002111',
+        "Imacr;":                    '\U0000012A',
+        "ImaginaryI;":               '\U00002148',
+        "Implies;":                  '\U000021D2',
+        "Int;":                      '\U0000222C',
+        "Integral;":                 '\U0000222B',
+        "Intersection;":             '\U000022C2',
+        "InvisibleComma;":           '\U00002063',
+        "InvisibleTimes;":           '\U00002062',
+        "Iogon;":                    '\U0000012E',
+        "Iopf;":                     '\U0001D540',
+        "Iota;":                     '\U00000399',
+        "Iscr;":                     '\U00002110',
+        "Itilde;":                   '\U00000128',
+        "Iukcy;":                    '\U00000406',
+        "Iuml;":                     '\U000000CF',
+        "Jcirc;":                    '\U00000134',
+        "Jcy;":                      '\U00000419',
+        "Jfr;":                      '\U0001D50D',
+        "Jopf;":                     '\U0001D541',
+        "Jscr;":                     '\U0001D4A5',
+        "Jsercy;":                   '\U00000408',
+        "Jukcy;":                    '\U00000404',
+        "KHcy;":                     '\U00000425',
+        "KJcy;":                     '\U0000040C',
+        "Kappa;":                    '\U0000039A',
+        "Kcedil;":                   '\U00000136',
+        "Kcy;":                      '\U0000041A',
+        "Kfr;":                      '\U0001D50E',
+        "Kopf;":                     '\U0001D542',
+        "Kscr;":                     '\U0001D4A6',
+        "LJcy;":                     '\U00000409',
+        "LT;":                       '\U0000003C',
+        "Lacute;":                   '\U00000139',
+        "Lambda;":                   '\U0000039B',
+        "Lang;":                     '\U000027EA',
+        "Laplacetrf;":               '\U00002112',
+        "Larr;":                     '\U0000219E',
+        "Lcaron;":                   '\U0000013D',
+        "Lcedil;":                   '\U0000013B',
+        "Lcy;":                      '\U0000041B',
+        "LeftAngleBracket;":         '\U000027E8',
+        "LeftArrow;":                '\U00002190',
+        "LeftArrowBar;":             '\U000021E4',
+        "LeftArrowRightArrow;":      '\U000021C6',
+        "LeftCeiling;":              '\U00002308',
+        "LeftDoubleBracket;":        '\U000027E6',
+        "LeftDownTeeVector;":        '\U00002961',
+        "LeftDownVector;":           '\U000021C3',
+        "LeftDownVectorBar;":        '\U00002959',
+        "LeftFloor;":                '\U0000230A',
+        "LeftRightArrow;":           '\U00002194',
+        "LeftRightVector;":          '\U0000294E',
+        "LeftTee;":                  '\U000022A3',
+        "LeftTeeArrow;":             '\U000021A4',
+        "LeftTeeVector;":            '\U0000295A',
+        "LeftTriangle;":             '\U000022B2',
+        "LeftTriangleBar;":          '\U000029CF',
+        "LeftTriangleEqual;":        '\U000022B4',
+        "LeftUpDownVector;":         '\U00002951',
+        "LeftUpTeeVector;":          '\U00002960',
+        "LeftUpVector;":             '\U000021BF',
+        "LeftUpVectorBar;":          '\U00002958',
+        "LeftVector;":               '\U000021BC',
+        "LeftVectorBar;":            '\U00002952',
+        "Leftarrow;":                '\U000021D0',
+        "Leftrightarrow;":           '\U000021D4',
+        "LessEqualGreater;":         '\U000022DA',
+        "LessFullEqual;":            '\U00002266',
+        "LessGreater;":              '\U00002276',
+        "LessLess;":                 '\U00002AA1',
+        "LessSlantEqual;":           '\U00002A7D',
+        "LessTilde;":                '\U00002272',
+        "Lfr;":                      '\U0001D50F',
+        "Ll;":                       '\U000022D8',
+        "Lleftarrow;":               '\U000021DA',
+        "Lmidot;":                   '\U0000013F',
+        "LongLeftArrow;":            '\U000027F5',
+        "LongLeftRightArrow;":       '\U000027F7',
+        "LongRightArrow;":           '\U000027F6',
+        "Longleftarrow;":            '\U000027F8',
+        "Longleftrightarrow;":       '\U000027FA',
+        "Longrightarrow;":           '\U000027F9',
+        "Lopf;":                     '\U0001D543',
+        "LowerLeftArrow;":           '\U00002199',
+        "LowerRightArrow;":          '\U00002198',
+        "Lscr;":                     '\U00002112',
+        "Lsh;":                      '\U000021B0',
+        "Lstrok;":                   '\U00000141',
+        "Lt;":                       '\U0000226A',
+        "Map;":                      '\U00002905',
+        "Mcy;":                      '\U0000041C',
+        "MediumSpace;":              '\U0000205F',
+        "Mellintrf;":                '\U00002133',
+        "Mfr;":                      '\U0001D510',
+        "MinusPlus;":                '\U00002213',
+        "Mopf;":                     '\U0001D544',
+        "Mscr;":                     '\U00002133',
+        "Mu;":                       '\U0000039C',
+        "NJcy;":                     '\U0000040A',
+        "Nacute;":                   '\U00000143',
+        "Ncaron;":                   '\U00000147',
+        "Ncedil;":                   '\U00000145',
+        "Ncy;":                      '\U0000041D',
+        "NegativeMediumSpace;":      '\U0000200B',
+        "NegativeThickSpace;":       '\U0000200B',
+        "NegativeThinSpace;":        '\U0000200B',
+        "NegativeVeryThinSpace;":    '\U0000200B',
+        "NestedGreaterGreater;":     '\U0000226B',
+        "NestedLessLess;":           '\U0000226A',
+        "NewLine;":                  '\U0000000A',
+        "Nfr;":                      '\U0001D511',
+        "NoBreak;":                  '\U00002060',
+        "NonBreakingSpace;":         '\U000000A0',
+        "Nopf;":                     '\U00002115',
+        "Not;":                      '\U00002AEC',
+        "NotCongruent;":             '\U00002262',
+        "NotCupCap;":                '\U0000226D',
+        "NotDoubleVerticalBar;":     '\U00002226',
+        "NotElement;":               '\U00002209',
+        "NotEqual;":                 '\U00002260',
+        "NotExists;":                '\U00002204',
+        "NotGreater;":               '\U0000226F',
+        "NotGreaterEqual;":          '\U00002271',
+        "NotGreaterLess;":           '\U00002279',
+        "NotGreaterTilde;":          '\U00002275',
+        "NotLeftTriangle;":          '\U000022EA',
+        "NotLeftTriangleEqual;":     '\U000022EC',
+        "NotLess;":                  '\U0000226E',
+        "NotLessEqual;":             '\U00002270',
+        "NotLessGreater;":           '\U00002278',
+        "NotLessTilde;":             '\U00002274',
+        "NotPrecedes;":              '\U00002280',
+        "NotPrecedesSlantEqual;":    '\U000022E0',
+        "NotReverseElement;":        '\U0000220C',
+        "NotRightTriangle;":         '\U000022EB',
+        "NotRightTriangleEqual;":    '\U000022ED',
+        "NotSquareSubsetEqual;":     '\U000022E2',
+        "NotSquareSupersetEqual;":   '\U000022E3',
+        "NotSubsetEqual;":           '\U00002288',
+        "NotSucceeds;":              '\U00002281',
+        "NotSucceedsSlantEqual;":    '\U000022E1',
+        "NotSupersetEqual;":         '\U00002289',
+        "NotTilde;":                 '\U00002241',
+        "NotTildeEqual;":            '\U00002244',
+        "NotTildeFullEqual;":        '\U00002247',
+        "NotTildeTilde;":            '\U00002249',
+        "NotVerticalBar;":           '\U00002224',
+        "Nscr;":                     '\U0001D4A9',
+        "Ntilde;":                   '\U000000D1',
+        "Nu;":                       '\U0000039D',
+        "OElig;":                    '\U00000152',
+        "Oacute;":                   '\U000000D3',
+        "Ocirc;":                    '\U000000D4',
+        "Ocy;":                      '\U0000041E',
+        "Odblac;":                   '\U00000150',
+        "Ofr;":                      '\U0001D512',
+        "Ograve;":                   '\U000000D2',
+        "Omacr;":                    '\U0000014C',
+        "Omega;":                    '\U000003A9',
+        "Omicron;":                  '\U0000039F',
+        "Oopf;":                     '\U0001D546',
+        "OpenCurlyDoubleQuote;":     '\U0000201C',
+        "OpenCurlyQuote;":           '\U00002018',
+        "Or;":                       '\U00002A54',
+        "Oscr;":                     '\U0001D4AA',
+        "Oslash;":                   '\U000000D8',
+        "Otilde;":                   '\U000000D5',
+        "Otimes;":                   '\U00002A37',
+        "Ouml;":                     '\U000000D6',
+        "OverBar;":                  '\U0000203E',
+        "OverBrace;":                '\U000023DE',
+        "OverBracket;":              '\U000023B4',
+        "OverParenthesis;":          '\U000023DC',
+        "PartialD;":                 '\U00002202',
+        "Pcy;":                      '\U0000041F',
+        "Pfr;":                      '\U0001D513',
+        "Phi;":                      '\U000003A6',
+        "Pi;":                       '\U000003A0',
+        "PlusMinus;":                '\U000000B1',
+        "Poincareplane;":            '\U0000210C',
+        "Popf;":                     '\U00002119',
+        "Pr;":                       '\U00002ABB',
+        "Precedes;":                 '\U0000227A',
+        "PrecedesEqual;":            '\U00002AAF',
+        "PrecedesSlantEqual;":       '\U0000227C',
+        "PrecedesTilde;":            '\U0000227E',
+        "Prime;":                    '\U00002033',
+        "Product;":                  '\U0000220F',
+        "Proportion;":               '\U00002237',
+        "Proportional;":             '\U0000221D',
+        "Pscr;":                     '\U0001D4AB',
+        "Psi;":                      '\U000003A8',
+        "QUOT;":                     '\U00000022',
+        "Qfr;":                      '\U0001D514',
+        "Qopf;":                     '\U0000211A',
+        "Qscr;":                     '\U0001D4AC',
+        "RBarr;":                    '\U00002910',
+        "REG;":                      '\U000000AE',
+        "Racute;":                   '\U00000154',
+        "Rang;":                     '\U000027EB',
+        "Rarr;":                     '\U000021A0',
+        "Rarrtl;":                   '\U00002916',
+        "Rcaron;":                   '\U00000158',
+        "Rcedil;":                   '\U00000156',
+        "Rcy;":                      '\U00000420',
+        "Re;":                       '\U0000211C',
+        "ReverseElement;":           '\U0000220B',
+        "ReverseEquilibrium;":       '\U000021CB',
+        "ReverseUpEquilibrium;":     '\U0000296F',
+        "Rfr;":                      '\U0000211C',
+        "Rho;":                      '\U000003A1',
+        "RightAngleBracket;":        '\U000027E9',
+        "RightArrow;":               '\U00002192',
+        "RightArrowBar;":            '\U000021E5',
+        "RightArrowLeftArrow;":      '\U000021C4',
+        "RightCeiling;":             '\U00002309',
+        "RightDoubleBracket;":       '\U000027E7',
+        "RightDownTeeVector;":       '\U0000295D',
+        "RightDownVector;":          '\U000021C2',
+        "RightDownVectorBar;":       '\U00002955',
+        "RightFloor;":               '\U0000230B',
+        "RightTee;":                 '\U000022A2',
+        "RightTeeArrow;":            '\U000021A6',
+        "RightTeeVector;":           '\U0000295B',
+        "RightTriangle;":            '\U000022B3',
+        "RightTriangleBar;":         '\U000029D0',
+        "RightTriangleEqual;":       '\U000022B5',
+        "RightUpDownVector;":        '\U0000294F',
+        "RightUpTeeVector;":         '\U0000295C',
+        "RightUpVector;":            '\U000021BE',
+        "RightUpVectorBar;":         '\U00002954',
+        "RightVector;":              '\U000021C0',
+        "RightVectorBar;":           '\U00002953',
+        "Rightarrow;":               '\U000021D2',
+        "Ropf;":                     '\U0000211D',
+        "RoundImplies;":             '\U00002970',
+        "Rrightarrow;":              '\U000021DB',
+        "Rscr;":                     '\U0000211B',
+        "Rsh;":                      '\U000021B1',
+        "RuleDelayed;":              '\U000029F4',
+        "SHCHcy;":                   '\U00000429',
+        "SHcy;":                     '\U00000428',
+        "SOFTcy;":                   '\U0000042C',
+        "Sacute;":                   '\U0000015A',
+        "Sc;":                       '\U00002ABC',
+        "Scaron;":                   '\U00000160',
+        "Scedil;":                   '\U0000015E',
+        "Scirc;":                    '\U0000015C',
+        "Scy;":                      '\U00000421',
+        "Sfr;":                      '\U0001D516',
+        "ShortDownArrow;":           '\U00002193',
+        "ShortLeftArrow;":           '\U00002190',
+        "ShortRightArrow;":          '\U00002192',
+        "ShortUpArrow;":             '\U00002191',
+        "Sigma;":                    '\U000003A3',
+        "SmallCircle;":              '\U00002218',
+        "Sopf;":                     '\U0001D54A',
+        "Sqrt;":                     '\U0000221A',
+        "Square;":                   '\U000025A1',
+        "SquareIntersection;":       '\U00002293',
+        "SquareSubset;":             '\U0000228F',
+        "SquareSubsetEqual;":        '\U00002291',
+        "SquareSuperset;":           '\U00002290',
+        "SquareSupersetEqual;":      '\U00002292',
+        "SquareUnion;":              '\U00002294',
+        "Sscr;":                     '\U0001D4AE',
+        "Star;":                     '\U000022C6',
+        "Sub;":                      '\U000022D0',
+        "Subset;":                   '\U000022D0',
+        "SubsetEqual;":              '\U00002286',
+        "Succeeds;":                 '\U0000227B',
+        "SucceedsEqual;":            '\U00002AB0',
+        "SucceedsSlantEqual;":       '\U0000227D',
+        "SucceedsTilde;":            '\U0000227F',
+        "SuchThat;":                 '\U0000220B',
+        "Sum;":                      '\U00002211',
+        "Sup;":                      '\U000022D1',
+        "Superset;":                 '\U00002283',
+        "SupersetEqual;":            '\U00002287',
+        "Supset;":                   '\U000022D1',
+        "THORN;":                    '\U000000DE',
+        "TRADE;":                    '\U00002122',
+        "TSHcy;":                    '\U0000040B',
+        "TScy;":                     '\U00000426',
+        "Tab;":                      '\U00000009',
+        "Tau;":                      '\U000003A4',
+        "Tcaron;":                   '\U00000164',
+        "Tcedil;":                   '\U00000162',
+        "Tcy;":                      '\U00000422',
+        "Tfr;":                      '\U0001D517',
+        "Therefore;":                '\U00002234',
+        "Theta;":                    '\U00000398',
+        "ThinSpace;":                '\U00002009',
+        "Tilde;":                    '\U0000223C',
+        "TildeEqual;":               '\U00002243',
+        "TildeFullEqual;":           '\U00002245',
+        "TildeTilde;":               '\U00002248',
+        "Topf;":                     '\U0001D54B',
+        "TripleDot;":                '\U000020DB',
+        "Tscr;":                     '\U0001D4AF',
+        "Tstrok;":                   '\U00000166',
+        "Uacute;":                   '\U000000DA',
+        "Uarr;":                     '\U0000219F',
+        "Uarrocir;":                 '\U00002949',
+        "Ubrcy;":                    '\U0000040E',
+        "Ubreve;":                   '\U0000016C',
+        "Ucirc;":                    '\U000000DB',
+        "Ucy;":                      '\U00000423',
+        "Udblac;":                   '\U00000170',
+        "Ufr;":                      '\U0001D518',
+        "Ugrave;":                   '\U000000D9',
+        "Umacr;":                    '\U0000016A',
+        "UnderBar;":                 '\U0000005F',
+        "UnderBrace;":               '\U000023DF',
+        "UnderBracket;":             '\U000023B5',
+        "UnderParenthesis;":         '\U000023DD',
+        "Union;":                    '\U000022C3',
+        "UnionPlus;":                '\U0000228E',
+        "Uogon;":                    '\U00000172',
+        "Uopf;":                     '\U0001D54C',
+        "UpArrow;":                  '\U00002191',
+        "UpArrowBar;":               '\U00002912',
+        "UpArrowDownArrow;":         '\U000021C5',
+        "UpDownArrow;":              '\U00002195',
+        "UpEquilibrium;":            '\U0000296E',
+        "UpTee;":                    '\U000022A5',
+        "UpTeeArrow;":               '\U000021A5',
+        "Uparrow;":                  '\U000021D1',
+        "Updownarrow;":              '\U000021D5',
+        "UpperLeftArrow;":           '\U00002196',
+        "UpperRightArrow;":          '\U00002197',
+        "Upsi;":                     '\U000003D2',
+        "Upsilon;":                  '\U000003A5',
+        "Uring;":                    '\U0000016E',
+        "Uscr;":                     '\U0001D4B0',
+        "Utilde;":                   '\U00000168',
+        "Uuml;":                     '\U000000DC',
+        "VDash;":                    '\U000022AB',
+        "Vbar;":                     '\U00002AEB',
+        "Vcy;":                      '\U00000412',
+        "Vdash;":                    '\U000022A9',
+        "Vdashl;":                   '\U00002AE6',
+        "Vee;":                      '\U000022C1',
+        "Verbar;":                   '\U00002016',
+        "Vert;":                     '\U00002016',
+        "VerticalBar;":              '\U00002223',
+        "VerticalLine;":             '\U0000007C',
+        "VerticalSeparator;":        '\U00002758',
+        "VerticalTilde;":            '\U00002240',
+        "VeryThinSpace;":            '\U0000200A',
+        "Vfr;":                      '\U0001D519',
+        "Vopf;":                     '\U0001D54D',
+        "Vscr;":                     '\U0001D4B1',
+        "Vvdash;":                   '\U000022AA',
+        "Wcirc;":                    '\U00000174',
+        "Wedge;":                    '\U000022C0',
+        "Wfr;":                      '\U0001D51A',
+        "Wopf;":                     '\U0001D54E',
+        "Wscr;":                     '\U0001D4B2',
+        "Xfr;":                      '\U0001D51B',
+        "Xi;":                       '\U0000039E',
+        "Xopf;":                     '\U0001D54F',
+        "Xscr;":                     '\U0001D4B3',
+        "YAcy;":                     '\U0000042F',
+        "YIcy;":                     '\U00000407',
+        "YUcy;":                     '\U0000042E',
+        "Yacute;":                   '\U000000DD',
+        "Ycirc;":                    '\U00000176',
+        "Ycy;":                      '\U0000042B',
+        "Yfr;":                      '\U0001D51C',
+        "Yopf;":                     '\U0001D550',
+        "Yscr;":                     '\U0001D4B4',
+        "Yuml;":                     '\U00000178',
+        "ZHcy;":                     '\U00000416',
+        "Zacute;":                   '\U00000179',
+        "Zcaron;":                   '\U0000017D',
+        "Zcy;":                      '\U00000417',
+        "Zdot;":                     '\U0000017B',
+        "ZeroWidthSpace;":           '\U0000200B',
+        "Zeta;":                     '\U00000396',
+        "Zfr;":                      '\U00002128',
+        "Zopf;":                     '\U00002124',
+        "Zscr;":                     '\U0001D4B5',
+        "aacute;":                   '\U000000E1',
+        "abreve;":                   '\U00000103',
+        "ac;":                       '\U0000223E',
+        "acd;":                      '\U0000223F',
+        "acirc;":                    '\U000000E2',
+        "acute;":                    '\U000000B4',
+        "acy;":                      '\U00000430',
+        "aelig;":                    '\U000000E6',
+        "af;":                       '\U00002061',
+        "afr;":                      '\U0001D51E',
+        "agrave;":                   '\U000000E0',
+        "alefsym;":                  '\U00002135',
+        "aleph;":                    '\U00002135',
+        "alpha;":                    '\U000003B1',
+        "amacr;":                    '\U00000101',
+        "amalg;":                    '\U00002A3F',
+        "amp;":                      '\U00000026',
+        "and;":                      '\U00002227',
+        "andand;":                   '\U00002A55',
+        "andd;":                     '\U00002A5C',
+        "andslope;":                 '\U00002A58',
+        "andv;":                     '\U00002A5A',
+        "ang;":                      '\U00002220',
+        "ange;":                     '\U000029A4',
+        "angle;":                    '\U00002220',
+        "angmsd;":                   '\U00002221',
+        "angmsdaa;":                 '\U000029A8',
+        "angmsdab;":                 '\U000029A9',
+        "angmsdac;":                 '\U000029AA',
+        "angmsdad;":                 '\U000029AB',
+        "angmsdae;":                 '\U000029AC',
+        "angmsdaf;":                 '\U000029AD',
+        "angmsdag;":                 '\U000029AE',
+        "angmsdah;":                 '\U000029AF',
+        "angrt;":                    '\U0000221F',
+        "angrtvb;":                  '\U000022BE',
+        "angrtvbd;":                 '\U0000299D',
+        "angsph;":                   '\U00002222',
+        "angst;":                    '\U000000C5',
+        "angzarr;":                  '\U0000237C',
+        "aogon;":                    '\U00000105',
+        "aopf;":                     '\U0001D552',
+        "ap;":                       '\U00002248',
+        "apE;":                      '\U00002A70',
+        "apacir;":                   '\U00002A6F',
+        "ape;":                      '\U0000224A',
+        "apid;":                     '\U0000224B',
+        "apos;":                     '\U00000027',
+        "approx;":                   '\U00002248',
+        "approxeq;":                 '\U0000224A',
+        "aring;":                    '\U000000E5',
+        "ascr;":                     '\U0001D4B6',
+        "ast;":                      '\U0000002A',
+        "asymp;":                    '\U00002248',
+        "asympeq;":                  '\U0000224D',
+        "atilde;":                   '\U000000E3',
+        "auml;":                     '\U000000E4',
+        "awconint;":                 '\U00002233',
+        "awint;":                    '\U00002A11',
+        "bNot;":                     '\U00002AED',
+        "backcong;":                 '\U0000224C',
+        "backepsilon;":              '\U000003F6',
+        "backprime;":                '\U00002035',
+        "backsim;":                  '\U0000223D',
+        "backsimeq;":                '\U000022CD',
+        "barvee;":                   '\U000022BD',
+        "barwed;":                   '\U00002305',
+        "barwedge;":                 '\U00002305',
+        "bbrk;":                     '\U000023B5',
+        "bbrktbrk;":                 '\U000023B6',
+        "bcong;":                    '\U0000224C',
+        "bcy;":                      '\U00000431',
+        "bdquo;":                    '\U0000201E',
+        "becaus;":                   '\U00002235',
+        "because;":                  '\U00002235',
+        "bemptyv;":                  '\U000029B0',
+        "bepsi;":                    '\U000003F6',
+        "bernou;":                   '\U0000212C',
+        "beta;":                     '\U000003B2',
+        "beth;":                     '\U00002136',
+        "between;":                  '\U0000226C',
+        "bfr;":                      '\U0001D51F',
+        "bigcap;":                   '\U000022C2',
+        "bigcirc;":                  '\U000025EF',
+        "bigcup;":                   '\U000022C3',
+        "bigodot;":                  '\U00002A00',
+        "bigoplus;":                 '\U00002A01',
+        "bigotimes;":                '\U00002A02',
+        "bigsqcup;":                 '\U00002A06',
+        "bigstar;":                  '\U00002605',
+        "bigtriangledown;":          '\U000025BD',
+        "bigtriangleup;":            '\U000025B3',
+        "biguplus;":                 '\U00002A04',
+        "bigvee;":                   '\U000022C1',
+        "bigwedge;":                 '\U000022C0',
+        "bkarow;":                   '\U0000290D',
+        "blacklozenge;":             '\U000029EB',
+        "blacksquare;":              '\U000025AA',
+        "blacktriangle;":            '\U000025B4',
+        "blacktriangledown;":        '\U000025BE',
+        "blacktriangleleft;":        '\U000025C2',
+        "blacktriangleright;":       '\U000025B8',
+        "blank;":                    '\U00002423',
+        "blk12;":                    '\U00002592',
+        "blk14;":                    '\U00002591',
+        "blk34;":                    '\U00002593',
+        "block;":                    '\U00002588',
+        "bnot;":                     '\U00002310',
+        "bopf;":                     '\U0001D553',
+        "bot;":                      '\U000022A5',
+        "bottom;":                   '\U000022A5',
+        "bowtie;":                   '\U000022C8',
+        "boxDL;":                    '\U00002557',
+        "boxDR;":                    '\U00002554',
+        "boxDl;":                    '\U00002556',
+        "boxDr;":                    '\U00002553',
+        "boxH;":                     '\U00002550',
+        "boxHD;":                    '\U00002566',
+        "boxHU;":                    '\U00002569',
+        "boxHd;":                    '\U00002564',
+        "boxHu;":                    '\U00002567',
+        "boxUL;":                    '\U0000255D',
+        "boxUR;":                    '\U0000255A',
+        "boxUl;":                    '\U0000255C',
+        "boxUr;":                    '\U00002559',
+        "boxV;":                     '\U00002551',
+        "boxVH;":                    '\U0000256C',
+        "boxVL;":                    '\U00002563',
+        "boxVR;":                    '\U00002560',
+        "boxVh;":                    '\U0000256B',
+        "boxVl;":                    '\U00002562',
+        "boxVr;":                    '\U0000255F',
+        "boxbox;":                   '\U000029C9',
+        "boxdL;":                    '\U00002555',
+        "boxdR;":                    '\U00002552',
+        "boxdl;":                    '\U00002510',
+        "boxdr;":                    '\U0000250C',
+        "boxh;":                     '\U00002500',
+        "boxhD;":                    '\U00002565',
+        "boxhU;":                    '\U00002568',
+        "boxhd;":                    '\U0000252C',
+        "boxhu;":                    '\U00002534',
+        "boxminus;":                 '\U0000229F',
+        "boxplus;":                  '\U0000229E',
+        "boxtimes;":                 '\U000022A0',
+        "boxuL;":                    '\U0000255B',
+        "boxuR;":                    '\U00002558',
+        "boxul;":                    '\U00002518',
+        "boxur;":                    '\U00002514',
+        "boxv;":                     '\U00002502',
+        "boxvH;":                    '\U0000256A',
+        "boxvL;":                    '\U00002561',
+        "boxvR;":                    '\U0000255E',
+        "boxvh;":                    '\U0000253C',
+        "boxvl;":                    '\U00002524',
+        "boxvr;":                    '\U0000251C',
+        "bprime;":                   '\U00002035',
+        "breve;":                    '\U000002D8',
+        "brvbar;":                   '\U000000A6',
+        "bscr;":                     '\U0001D4B7',
+        "bsemi;":                    '\U0000204F',
+        "bsim;":                     '\U0000223D',
+        "bsime;":                    '\U000022CD',
+        "bsol;":                     '\U0000005C',
+        "bsolb;":                    '\U000029C5',
+        "bsolhsub;":                 '\U000027C8',
+        "bull;":                     '\U00002022',
+        "bullet;":                   '\U00002022',
+        "bump;":                     '\U0000224E',
+        "bumpE;":                    '\U00002AAE',
+        "bumpe;":                    '\U0000224F',
+        "bumpeq;":                   '\U0000224F',
+        "cacute;":                   '\U00000107',
+        "cap;":                      '\U00002229',
+        "capand;":                   '\U00002A44',
+        "capbrcup;":                 '\U00002A49',
+        "capcap;":                   '\U00002A4B',
+        "capcup;":                   '\U00002A47',
+        "capdot;":                   '\U00002A40',
+        "caret;":                    '\U00002041',
+        "caron;":                    '\U000002C7',
+        "ccaps;":                    '\U00002A4D',
+        "ccaron;":                   '\U0000010D',
+        "ccedil;":                   '\U000000E7',
+        "ccirc;":                    '\U00000109',
+        "ccups;":                    '\U00002A4C',
+        "ccupssm;":                  '\U00002A50',
+        "cdot;":                     '\U0000010B',
+        "cedil;":                    '\U000000B8',
+        "cemptyv;":                  '\U000029B2',
+        "cent;":                     '\U000000A2',
+        "centerdot;":                '\U000000B7',
+        "cfr;":                      '\U0001D520',
+        "chcy;":                     '\U00000447',
+        "check;":                    '\U00002713',
+        "checkmark;":                '\U00002713',
+        "chi;":                      '\U000003C7',
+        "cir;":                      '\U000025CB',
+        "cirE;":                     '\U000029C3',
+        "circ;":                     '\U000002C6',
+        "circeq;":                   '\U00002257',
+        "circlearrowleft;":          '\U000021BA',
+        "circlearrowright;":         '\U000021BB',
+        "circledR;":                 '\U000000AE',
+        "circledS;":                 '\U000024C8',
+        "circledast;":               '\U0000229B',
+        "circledcirc;":              '\U0000229A',
+        "circleddash;":              '\U0000229D',
+        "cire;":                     '\U00002257',
+        "cirfnint;":                 '\U00002A10',
+        "cirmid;":                   '\U00002AEF',
+        "cirscir;":                  '\U000029C2',
+        "clubs;":                    '\U00002663',
+        "clubsuit;":                 '\U00002663',
+        "colon;":                    '\U0000003A',
+        "colone;":                   '\U00002254',
+        "coloneq;":                  '\U00002254',
+        "comma;":                    '\U0000002C',
+        "commat;":                   '\U00000040',
+        "comp;":                     '\U00002201',
+        "compfn;":                   '\U00002218',
+        "complement;":               '\U00002201',
+        "complexes;":                '\U00002102',
+        "cong;":                     '\U00002245',
+        "congdot;":                  '\U00002A6D',
+        "conint;":                   '\U0000222E',
+        "copf;":                     '\U0001D554',
+        "coprod;":                   '\U00002210',
+        "copy;":                     '\U000000A9',
+        "copysr;":                   '\U00002117',
+        "crarr;":                    '\U000021B5',
+        "cross;":                    '\U00002717',
+        "cscr;":                     '\U0001D4B8',
+        "csub;":                     '\U00002ACF',
+        "csube;":                    '\U00002AD1',
+        "csup;":                     '\U00002AD0',
+        "csupe;":                    '\U00002AD2',
+        "ctdot;":                    '\U000022EF',
+        "cudarrl;":                  '\U00002938',
+        "cudarrr;":                  '\U00002935',
+        "cuepr;":                    '\U000022DE',
+        "cuesc;":                    '\U000022DF',
+        "cularr;":                   '\U000021B6',
+        "cularrp;":                  '\U0000293D',
+        "cup;":                      '\U0000222A',
+        "cupbrcap;":                 '\U00002A48',
+        "cupcap;":                   '\U00002A46',
+        "cupcup;":                   '\U00002A4A',
+        "cupdot;":                   '\U0000228D',
+        "cupor;":                    '\U00002A45',
+        "curarr;":                   '\U000021B7',
+        "curarrm;":                  '\U0000293C',
+        "curlyeqprec;":              '\U000022DE',
+        "curlyeqsucc;":              '\U000022DF',
+        "curlyvee;":                 '\U000022CE',
+        "curlywedge;":               '\U000022CF',
+        "curren;":                   '\U000000A4',
+        "curvearrowleft;":           '\U000021B6',
+        "curvearrowright;":          '\U000021B7',
+        "cuvee;":                    '\U000022CE',
+        "cuwed;":                    '\U000022CF',
+        "cwconint;":                 '\U00002232',
+        "cwint;":                    '\U00002231',
+        "cylcty;":                   '\U0000232D',
+        "dArr;":                     '\U000021D3',
+        "dHar;":                     '\U00002965',
+        "dagger;":                   '\U00002020',
+        "daleth;":                   '\U00002138',
+        "darr;":                     '\U00002193',
+        "dash;":                     '\U00002010',
+        "dashv;":                    '\U000022A3',
+        "dbkarow;":                  '\U0000290F',
+        "dblac;":                    '\U000002DD',
+        "dcaron;":                   '\U0000010F',
+        "dcy;":                      '\U00000434',
+        "dd;":                       '\U00002146',
+        "ddagger;":                  '\U00002021',
+        "ddarr;":                    '\U000021CA',
+        "ddotseq;":                  '\U00002A77',
+        "deg;":                      '\U000000B0',
+        "delta;":                    '\U000003B4',
+        "demptyv;":                  '\U000029B1',
+        "dfisht;":                   '\U0000297F',
+        "dfr;":                      '\U0001D521',
+        "dharl;":                    '\U000021C3',
+        "dharr;":                    '\U000021C2',
+        "diam;":                     '\U000022C4',
+        "diamond;":                  '\U000022C4',
+        "diamondsuit;":              '\U00002666',
+        "diams;":                    '\U00002666',
+        "die;":                      '\U000000A8',
+        "digamma;":                  '\U000003DD',
+        "disin;":                    '\U000022F2',
+        "div;":                      '\U000000F7',
+        "divide;":                   '\U000000F7',
+        "divideontimes;":            '\U000022C7',
+        "divonx;":                   '\U000022C7',
+        "djcy;":                     '\U00000452',
+        "dlcorn;":                   '\U0000231E',
+        "dlcrop;":                   '\U0000230D',
+        "dollar;":                   '\U00000024',
+        "dopf;":                     '\U0001D555',
+        "dot;":                      '\U000002D9',
+        "doteq;":                    '\U00002250',
+        "doteqdot;":                 '\U00002251',
+        "dotminus;":                 '\U00002238',
+        "dotplus;":                  '\U00002214',
+        "dotsquare;":                '\U000022A1',
+        "doublebarwedge;":           '\U00002306',
+        "downarrow;":                '\U00002193',
+        "downdownarrows;":           '\U000021CA',
+        "downharpoonleft;":          '\U000021C3',
+        "downharpoonright;":         '\U000021C2',
+        "drbkarow;":                 '\U00002910',
+        "drcorn;":                   '\U0000231F',
+        "drcrop;":                   '\U0000230C',
+        "dscr;":                     '\U0001D4B9',
+        "dscy;":                     '\U00000455',
+        "dsol;":                     '\U000029F6',
+        "dstrok;":                   '\U00000111',
+        "dtdot;":                    '\U000022F1',
+        "dtri;":                     '\U000025BF',
+        "dtrif;":                    '\U000025BE',
+        "duarr;":                    '\U000021F5',
+        "duhar;":                    '\U0000296F',
+        "dwangle;":                  '\U000029A6',
+        "dzcy;":                     '\U0000045F',
+        "dzigrarr;":                 '\U000027FF',
+        "eDDot;":                    '\U00002A77',
+        "eDot;":                     '\U00002251',
+        "eacute;":                   '\U000000E9',
+        "easter;":                   '\U00002A6E',
+        "ecaron;":                   '\U0000011B',
+        "ecir;":                     '\U00002256',
+        "ecirc;":                    '\U000000EA',
+        "ecolon;":                   '\U00002255',
+        "ecy;":                      '\U0000044D',
+        "edot;":                     '\U00000117',
+        "ee;":                       '\U00002147',
+        "efDot;":                    '\U00002252',
+        "efr;":                      '\U0001D522',
+        "eg;":                       '\U00002A9A',
+        "egrave;":                   '\U000000E8',
+        "egs;":                      '\U00002A96',
+        "egsdot;":                   '\U00002A98',
+        "el;":                       '\U00002A99',
+        "elinters;":                 '\U000023E7',
+        "ell;":                      '\U00002113',
+        "els;":                      '\U00002A95',
+        "elsdot;":                   '\U00002A97',
+        "emacr;":                    '\U00000113',
+        "empty;":                    '\U00002205',
+        "emptyset;":                 '\U00002205',
+        "emptyv;":                   '\U00002205',
+        "emsp;":                     '\U00002003',
+        "emsp13;":                   '\U00002004',
+        "emsp14;":                   '\U00002005',
+        "eng;":                      '\U0000014B',
+        "ensp;":                     '\U00002002',
+        "eogon;":                    '\U00000119',
+        "eopf;":                     '\U0001D556',
+        "epar;":                     '\U000022D5',
+        "eparsl;":                   '\U000029E3',
+        "eplus;":                    '\U00002A71',
+        "epsi;":                     '\U000003B5',
+        "epsilon;":                  '\U000003B5',
+        "epsiv;":                    '\U000003F5',
+        "eqcirc;":                   '\U00002256',
+        "eqcolon;":                  '\U00002255',
+        "eqsim;":                    '\U00002242',
+        "eqslantgtr;":               '\U00002A96',
+        "eqslantless;":              '\U00002A95',
+        "equals;":                   '\U0000003D',
+        "equest;":                   '\U0000225F',
+        "equiv;":                    '\U00002261',
+        "equivDD;":                  '\U00002A78',
+        "eqvparsl;":                 '\U000029E5',
+        "erDot;":                    '\U00002253',
+        "erarr;":                    '\U00002971',
+        "escr;":                     '\U0000212F',
+        "esdot;":                    '\U00002250',
+        "esim;":                     '\U00002242',
+        "eta;":                      '\U000003B7',
+        "eth;":                      '\U000000F0',
+        "euml;":                     '\U000000EB',
+        "euro;":                     '\U000020AC',
+        "excl;":                     '\U00000021',
+        "exist;":                    '\U00002203',
+        "expectation;":              '\U00002130',
+        "exponentiale;":             '\U00002147',
+        "fallingdotseq;":            '\U00002252',
+        "fcy;":                      '\U00000444',
+        "female;":                   '\U00002640',
+        "ffilig;":                   '\U0000FB03',
+        "fflig;":                    '\U0000FB00',
+        "ffllig;":                   '\U0000FB04',
+        "ffr;":                      '\U0001D523',
+        "filig;":                    '\U0000FB01',
+        "flat;":                     '\U0000266D',
+        "fllig;":                    '\U0000FB02',
+        "fltns;":                    '\U000025B1',
+        "fnof;":                     '\U00000192',
+        "fopf;":                     '\U0001D557',
+        "forall;":                   '\U00002200',
+        "fork;":                     '\U000022D4',
+        "forkv;":                    '\U00002AD9',
+        "fpartint;":                 '\U00002A0D',
+        "frac12;":                   '\U000000BD',
+        "frac13;":                   '\U00002153',
+        "frac14;":                   '\U000000BC',
+        "frac15;":                   '\U00002155',
+        "frac16;":                   '\U00002159',
+        "frac18;":                   '\U0000215B',
+        "frac23;":                   '\U00002154',
+        "frac25;":                   '\U00002156',
+        "frac34;":                   '\U000000BE',
+        "frac35;":                   '\U00002157',
+        "frac38;":                   '\U0000215C',
+        "frac45;":                   '\U00002158',
+        "frac56;":                   '\U0000215A',
+        "frac58;":                   '\U0000215D',
+        "frac78;":                   '\U0000215E',
+        "frasl;":                    '\U00002044',
+        "frown;":                    '\U00002322',
+        "fscr;":                     '\U0001D4BB',
+        "gE;":                       '\U00002267',
+        "gEl;":                      '\U00002A8C',
+        "gacute;":                   '\U000001F5',
+        "gamma;":                    '\U000003B3',
+        "gammad;":                   '\U000003DD',
+        "gap;":                      '\U00002A86',
+        "gbreve;":                   '\U0000011F',
+        "gcirc;":                    '\U0000011D',
+        "gcy;":                      '\U00000433',
+        "gdot;":                     '\U00000121',
+        "ge;":                       '\U00002265',
+        "gel;":                      '\U000022DB',
+        "geq;":                      '\U00002265',
+        "geqq;":                     '\U00002267',
+        "geqslant;":                 '\U00002A7E',
+        "ges;":                      '\U00002A7E',
+        "gescc;":                    '\U00002AA9',
+        "gesdot;":                   '\U00002A80',
+        "gesdoto;":                  '\U00002A82',
+        "gesdotol;":                 '\U00002A84',
+        "gesles;":                   '\U00002A94',
+        "gfr;":                      '\U0001D524',
+        "gg;":                       '\U0000226B',
+        "ggg;":                      '\U000022D9',
+        "gimel;":                    '\U00002137',
+        "gjcy;":                     '\U00000453',
+        "gl;":                       '\U00002277',
+        "glE;":                      '\U00002A92',
+        "gla;":                      '\U00002AA5',
+        "glj;":                      '\U00002AA4',
+        "gnE;":                      '\U00002269',
+        "gnap;":                     '\U00002A8A',
+        "gnapprox;":                 '\U00002A8A',
+        "gne;":                      '\U00002A88',
+        "gneq;":                     '\U00002A88',
+        "gneqq;":                    '\U00002269',
+        "gnsim;":                    '\U000022E7',
+        "gopf;":                     '\U0001D558',
+        "grave;":                    '\U00000060',
+        "gscr;":                     '\U0000210A',
+        "gsim;":                     '\U00002273',
+        "gsime;":                    '\U00002A8E',
+        "gsiml;":                    '\U00002A90',
+        "gt;":                       '\U0000003E',
+        "gtcc;":                     '\U00002AA7',
+        "gtcir;":                    '\U00002A7A',
+        "gtdot;":                    '\U000022D7',
+        "gtlPar;":                   '\U00002995',
+        "gtquest;":                  '\U00002A7C',
+        "gtrapprox;":                '\U00002A86',
+        "gtrarr;":                   '\U00002978',
+        "gtrdot;":                   '\U000022D7',
+        "gtreqless;":                '\U000022DB',
+        "gtreqqless;":               '\U00002A8C',
+        "gtrless;":                  '\U00002277',
+        "gtrsim;":                   '\U00002273',
+        "hArr;":                     '\U000021D4',
+        "hairsp;":                   '\U0000200A',
+        "half;":                     '\U000000BD',
+        "hamilt;":                   '\U0000210B',
+        "hardcy;":                   '\U0000044A',
+        "harr;":                     '\U00002194',
+        "harrcir;":                  '\U00002948',
+        "harrw;":                    '\U000021AD',
+        "hbar;":                     '\U0000210F',
+        "hcirc;":                    '\U00000125',
+        "hearts;":                   '\U00002665',
+        "heartsuit;":                '\U00002665',
+        "hellip;":                   '\U00002026',
+        "hercon;":                   '\U000022B9',
+        "hfr;":                      '\U0001D525',
+        "hksearow;":                 '\U00002925',
+        "hkswarow;":                 '\U00002926',
+        "hoarr;":                    '\U000021FF',
+        "homtht;":                   '\U0000223B',
+        "hookleftarrow;":            '\U000021A9',
+        "hookrightarrow;":           '\U000021AA',
+        "hopf;":                     '\U0001D559',
+        "horbar;":                   '\U00002015',
+        "hscr;":                     '\U0001D4BD',
+        "hslash;":                   '\U0000210F',
+        "hstrok;":                   '\U00000127',
+        "hybull;":                   '\U00002043',
+        "hyphen;":                   '\U00002010',
+        "iacute;":                   '\U000000ED',
+        "ic;":                       '\U00002063',
+        "icirc;":                    '\U000000EE',
+        "icy;":                      '\U00000438',
+        "iecy;":                     '\U00000435',
+        "iexcl;":                    '\U000000A1',
+        "iff;":                      '\U000021D4',
+        "ifr;":                      '\U0001D526',
+        "igrave;":                   '\U000000EC',
+        "ii;":                       '\U00002148',
+        "iiiint;":                   '\U00002A0C',
+        "iiint;":                    '\U0000222D',
+        "iinfin;":                   '\U000029DC',
+        "iiota;":                    '\U00002129',
+        "ijlig;":                    '\U00000133',
+        "imacr;":                    '\U0000012B',
+        "image;":                    '\U00002111',
+        "imagline;":                 '\U00002110',
+        "imagpart;":                 '\U00002111',
+        "imath;":                    '\U00000131',
+        "imof;":                     '\U000022B7',
+        "imped;":                    '\U000001B5',
+        "in;":                       '\U00002208',
+        "incare;":                   '\U00002105',
+        "infin;":                    '\U0000221E',
+        "infintie;":                 '\U000029DD',
+        "inodot;":                   '\U00000131',
+        "int;":                      '\U0000222B',
+        "intcal;":                   '\U000022BA',
+        "integers;":                 '\U00002124',
+        "intercal;":                 '\U000022BA',
+        "intlarhk;":                 '\U00002A17',
+        "intprod;":                  '\U00002A3C',
+        "iocy;":                     '\U00000451',
+        "iogon;":                    '\U0000012F',
+        "iopf;":                     '\U0001D55A',
+        "iota;":                     '\U000003B9',
+        "iprod;":                    '\U00002A3C',
+        "iquest;":                   '\U000000BF',
+        "iscr;":                     '\U0001D4BE',
+        "isin;":                     '\U00002208',
+        "isinE;":                    '\U000022F9',
+        "isindot;":                  '\U000022F5',
+        "isins;":                    '\U000022F4',
+        "isinsv;":                   '\U000022F3',
+        "isinv;":                    '\U00002208',
+        "it;":                       '\U00002062',
+        "itilde;":                   '\U00000129',
+        "iukcy;":                    '\U00000456',
+        "iuml;":                     '\U000000EF',
+        "jcirc;":                    '\U00000135',
+        "jcy;":                      '\U00000439',
+        "jfr;":                      '\U0001D527',
+        "jmath;":                    '\U00000237',
+        "jopf;":                     '\U0001D55B',
+        "jscr;":                     '\U0001D4BF',
+        "jsercy;":                   '\U00000458',
+        "jukcy;":                    '\U00000454',
+        "kappa;":                    '\U000003BA',
+        "kappav;":                   '\U000003F0',
+        "kcedil;":                   '\U00000137',
+        "kcy;":                      '\U0000043A',
+        "kfr;":                      '\U0001D528',
+        "kgreen;":                   '\U00000138',
+        "khcy;":                     '\U00000445',
+        "kjcy;":                     '\U0000045C',
+        "kopf;":                     '\U0001D55C',
+        "kscr;":                     '\U0001D4C0',
+        "lAarr;":                    '\U000021DA',
+        "lArr;":                     '\U000021D0',
+        "lAtail;":                   '\U0000291B',
+        "lBarr;":                    '\U0000290E',
+        "lE;":                       '\U00002266',
+        "lEg;":                      '\U00002A8B',
+        "lHar;":                     '\U00002962',
+        "lacute;":                   '\U0000013A',
+        "laemptyv;":                 '\U000029B4',
+        "lagran;":                   '\U00002112',
+        "lambda;":                   '\U000003BB',
+        "lang;":                     '\U000027E8',
+        "langd;":                    '\U00002991',
+        "langle;":                   '\U000027E8',
+        "lap;":                      '\U00002A85',
+        "laquo;":                    '\U000000AB',
+        "larr;":                     '\U00002190',
+        "larrb;":                    '\U000021E4',
+        "larrbfs;":                  '\U0000291F',
+        "larrfs;":                   '\U0000291D',
+        "larrhk;":                   '\U000021A9',
+        "larrlp;":                   '\U000021AB',
+        "larrpl;":                   '\U00002939',
+        "larrsim;":                  '\U00002973',
+        "larrtl;":                   '\U000021A2',
+        "lat;":                      '\U00002AAB',
+        "latail;":                   '\U00002919',
+        "late;":                     '\U00002AAD',
+        "lbarr;":                    '\U0000290C',
+        "lbbrk;":                    '\U00002772',
+        "lbrace;":                   '\U0000007B',
+        "lbrack;":                   '\U0000005B',
+        "lbrke;":                    '\U0000298B',
+        "lbrksld;":                  '\U0000298F',
+        "lbrkslu;":                  '\U0000298D',
+        "lcaron;":                   '\U0000013E',
+        "lcedil;":                   '\U0000013C',
+        "lceil;":                    '\U00002308',
+        "lcub;":                     '\U0000007B',
+        "lcy;":                      '\U0000043B',
+        "ldca;":                     '\U00002936',
+        "ldquo;":                    '\U0000201C',
+        "ldquor;":                   '\U0000201E',
+        "ldrdhar;":                  '\U00002967',
+        "ldrushar;":                 '\U0000294B',
+        "ldsh;":                     '\U000021B2',
+        "le;":                       '\U00002264',
+        "leftarrow;":                '\U00002190',
+        "leftarrowtail;":            '\U000021A2',
+        "leftharpoondown;":          '\U000021BD',
+        "leftharpoonup;":            '\U000021BC',
+        "leftleftarrows;":           '\U000021C7',
+        "leftrightarrow;":           '\U00002194',
+        "leftrightarrows;":          '\U000021C6',
+        "leftrightharpoons;":        '\U000021CB',
+        "leftrightsquigarrow;":      '\U000021AD',
+        "leftthreetimes;":           '\U000022CB',
+        "leg;":                      '\U000022DA',
+        "leq;":                      '\U00002264',
+        "leqq;":                     '\U00002266',
+        "leqslant;":                 '\U00002A7D',
+        "les;":                      '\U00002A7D',
+        "lescc;":                    '\U00002AA8',
+        "lesdot;":                   '\U00002A7F',
+        "lesdoto;":                  '\U00002A81',
+        "lesdotor;":                 '\U00002A83',
+        "lesges;":                   '\U00002A93',
+        "lessapprox;":               '\U00002A85',
+        "lessdot;":                  '\U000022D6',
+        "lesseqgtr;":                '\U000022DA',
+        "lesseqqgtr;":               '\U00002A8B',
+        "lessgtr;":                  '\U00002276',
+        "lesssim;":                  '\U00002272',
+        "lfisht;":                   '\U0000297C',
+        "lfloor;":                   '\U0000230A',
+        "lfr;":                      '\U0001D529',
+        "lg;":                       '\U00002276',
+        "lgE;":                      '\U00002A91',
+        "lhard;":                    '\U000021BD',
+        "lharu;":                    '\U000021BC',
+        "lharul;":                   '\U0000296A',
+        "lhblk;":                    '\U00002584',
+        "ljcy;":                     '\U00000459',
+        "ll;":                       '\U0000226A',
+        "llarr;":                    '\U000021C7',
+        "llcorner;":                 '\U0000231E',
+        "llhard;":                   '\U0000296B',
+        "lltri;":                    '\U000025FA',
+        "lmidot;":                   '\U00000140',
+        "lmoust;":                   '\U000023B0',
+        "lmoustache;":               '\U000023B0',
+        "lnE;":                      '\U00002268',
+        "lnap;":                     '\U00002A89',
+        "lnapprox;":                 '\U00002A89',
+        "lne;":                      '\U00002A87',
+        "lneq;":                     '\U00002A87',
+        "lneqq;":                    '\U00002268',
+        "lnsim;":                    '\U000022E6',
+        "loang;":                    '\U000027EC',
+        "loarr;":                    '\U000021FD',
+        "lobrk;":                    '\U000027E6',
+        "longleftarrow;":            '\U000027F5',
+        "longleftrightarrow;":       '\U000027F7',
+        "longmapsto;":               '\U000027FC',
+        "longrightarrow;":           '\U000027F6',
+        "looparrowleft;":            '\U000021AB',
+        "looparrowright;":           '\U000021AC',
+        "lopar;":                    '\U00002985',
+        "lopf;":                     '\U0001D55D',
+        "loplus;":                   '\U00002A2D',
+        "lotimes;":                  '\U00002A34',
+        "lowast;":                   '\U00002217',
+        "lowbar;":                   '\U0000005F',
+        "loz;":                      '\U000025CA',
+        "lozenge;":                  '\U000025CA',
+        "lozf;":                     '\U000029EB',
+        "lpar;":                     '\U00000028',
+        "lparlt;":                   '\U00002993',
+        "lrarr;":                    '\U000021C6',
+        "lrcorner;":                 '\U0000231F',
+        "lrhar;":                    '\U000021CB',
+        "lrhard;":                   '\U0000296D',
+        "lrm;":                      '\U0000200E',
+        "lrtri;":                    '\U000022BF',
+        "lsaquo;":                   '\U00002039',
+        "lscr;":                     '\U0001D4C1',
+        "lsh;":                      '\U000021B0',
+        "lsim;":                     '\U00002272',
+        "lsime;":                    '\U00002A8D',
+        "lsimg;":                    '\U00002A8F',
+        "lsqb;":                     '\U0000005B',
+        "lsquo;":                    '\U00002018',
+        "lsquor;":                   '\U0000201A',
+        "lstrok;":                   '\U00000142',
+        "lt;":                       '\U0000003C',
+        "ltcc;":                     '\U00002AA6',
+        "ltcir;":                    '\U00002A79',
+        "ltdot;":                    '\U000022D6',
+        "lthree;":                   '\U000022CB',
+        "ltimes;":                   '\U000022C9',
+        "ltlarr;":                   '\U00002976',
+        "ltquest;":                  '\U00002A7B',
+        "ltrPar;":                   '\U00002996',
+        "ltri;":                     '\U000025C3',
+        "ltrie;":                    '\U000022B4',
+        "ltrif;":                    '\U000025C2',
+        "lurdshar;":                 '\U0000294A',
+        "luruhar;":                  '\U00002966',
+        "mDDot;":                    '\U0000223A',
+        "macr;":                     '\U000000AF',
+        "male;":                     '\U00002642',
+        "malt;":                     '\U00002720',
+        "maltese;":                  '\U00002720',
+        "map;":                      '\U000021A6',
+        "mapsto;":                   '\U000021A6',
+        "mapstodown;":               '\U000021A7',
+        "mapstoleft;":               '\U000021A4',
+        "mapstoup;":                 '\U000021A5',
+        "marker;":                   '\U000025AE',
+        "mcomma;":                   '\U00002A29',
+        "mcy;":                      '\U0000043C',
+        "mdash;":                    '\U00002014',
+        "measuredangle;":            '\U00002221',
+        "mfr;":                      '\U0001D52A',
+        "mho;":                      '\U00002127',
+        "micro;":                    '\U000000B5',
+        "mid;":                      '\U00002223',
+        "midast;":                   '\U0000002A',
+        "midcir;":                   '\U00002AF0',
+        "middot;":                   '\U000000B7',
+        "minus;":                    '\U00002212',
+        "minusb;":                   '\U0000229F',
+        "minusd;":                   '\U00002238',
+        "minusdu;":                  '\U00002A2A',
+        "mlcp;":                     '\U00002ADB',
+        "mldr;":                     '\U00002026',
+        "mnplus;":                   '\U00002213',
+        "models;":                   '\U000022A7',
+        "mopf;":                     '\U0001D55E',
+        "mp;":                       '\U00002213',
+        "mscr;":                     '\U0001D4C2',
+        "mstpos;":                   '\U0000223E',
+        "mu;":                       '\U000003BC',
+        "multimap;":                 '\U000022B8',
+        "mumap;":                    '\U000022B8',
+        "nLeftarrow;":               '\U000021CD',
+        "nLeftrightarrow;":          '\U000021CE',
+        "nRightarrow;":              '\U000021CF',
+        "nVDash;":                   '\U000022AF',
+        "nVdash;":                   '\U000022AE',
+        "nabla;":                    '\U00002207',
+        "nacute;":                   '\U00000144',
+        "nap;":                      '\U00002249',
+        "napos;":                    '\U00000149',
+        "napprox;":                  '\U00002249',
+        "natur;":                    '\U0000266E',
+        "natural;":                  '\U0000266E',
+        "naturals;":                 '\U00002115',
+        "nbsp;":                     '\U000000A0',
+        "ncap;":                     '\U00002A43',
+        "ncaron;":                   '\U00000148',
+        "ncedil;":                   '\U00000146',
+        "ncong;":                    '\U00002247',
+        "ncup;":                     '\U00002A42',
+        "ncy;":                      '\U0000043D',
+        "ndash;":                    '\U00002013',
+        "ne;":                       '\U00002260',
+        "neArr;":                    '\U000021D7',
+        "nearhk;":                   '\U00002924',
+        "nearr;":                    '\U00002197',
+        "nearrow;":                  '\U00002197',
+        "nequiv;":                   '\U00002262',
+        "nesear;":                   '\U00002928',
+        "nexist;":                   '\U00002204',
+        "nexists;":                  '\U00002204',
+        "nfr;":                      '\U0001D52B',
+        "nge;":                      '\U00002271',
+        "ngeq;":                     '\U00002271',
+        "ngsim;":                    '\U00002275',
+        "ngt;":                      '\U0000226F',
+        "ngtr;":                     '\U0000226F',
+        "nhArr;":                    '\U000021CE',
+        "nharr;":                    '\U000021AE',
+        "nhpar;":                    '\U00002AF2',
+        "ni;":                       '\U0000220B',
+        "nis;":                      '\U000022FC',
+        "nisd;":                     '\U000022FA',
+        "niv;":                      '\U0000220B',
+        "njcy;":                     '\U0000045A',
+        "nlArr;":                    '\U000021CD',
+        "nlarr;":                    '\U0000219A',
+        "nldr;":                     '\U00002025',
+        "nle;":                      '\U00002270',
+        "nleftarrow;":               '\U0000219A',
+        "nleftrightarrow;":          '\U000021AE',
+        "nleq;":                     '\U00002270',
+        "nless;":                    '\U0000226E',
+        "nlsim;":                    '\U00002274',
+        "nlt;":                      '\U0000226E',
+        "nltri;":                    '\U000022EA',
+        "nltrie;":                   '\U000022EC',
+        "nmid;":                     '\U00002224',
+        "nopf;":                     '\U0001D55F',
+        "not;":                      '\U000000AC',
+        "notin;":                    '\U00002209',
+        "notinva;":                  '\U00002209',
+        "notinvb;":                  '\U000022F7',
+        "notinvc;":                  '\U000022F6',
+        "notni;":                    '\U0000220C',
+        "notniva;":                  '\U0000220C',
+        "notnivb;":                  '\U000022FE',
+        "notnivc;":                  '\U000022FD',
+        "npar;":                     '\U00002226',
+        "nparallel;":                '\U00002226',
+        "npolint;":                  '\U00002A14',
+        "npr;":                      '\U00002280',
+        "nprcue;":                   '\U000022E0',
+        "nprec;":                    '\U00002280',
+        "nrArr;":                    '\U000021CF',
+        "nrarr;":                    '\U0000219B',
+        "nrightarrow;":              '\U0000219B',
+        "nrtri;":                    '\U000022EB',
+        "nrtrie;":                   '\U000022ED',
+        "nsc;":                      '\U00002281',
+        "nsccue;":                   '\U000022E1',
+        "nscr;":                     '\U0001D4C3',
+        "nshortmid;":                '\U00002224',
+        "nshortparallel;":           '\U00002226',
+        "nsim;":                     '\U00002241',
+        "nsime;":                    '\U00002244',
+        "nsimeq;":                   '\U00002244',
+        "nsmid;":                    '\U00002224',
+        "nspar;":                    '\U00002226',
+        "nsqsube;":                  '\U000022E2',
+        "nsqsupe;":                  '\U000022E3',
+        "nsub;":                     '\U00002284',
+        "nsube;":                    '\U00002288',
+        "nsubseteq;":                '\U00002288',
+        "nsucc;":                    '\U00002281',
+        "nsup;":                     '\U00002285',
+        "nsupe;":                    '\U00002289',
+        "nsupseteq;":                '\U00002289',
+        "ntgl;":                     '\U00002279',
+        "ntilde;":                   '\U000000F1',
+        "ntlg;":                     '\U00002278',
+        "ntriangleleft;":            '\U000022EA',
+        "ntrianglelefteq;":          '\U000022EC',
+        "ntriangleright;":           '\U000022EB',
+        "ntrianglerighteq;":         '\U000022ED',
+        "nu;":                       '\U000003BD',
+        "num;":                      '\U00000023',
+        "numero;":                   '\U00002116',
+        "numsp;":                    '\U00002007',
+        "nvDash;":                   '\U000022AD',
+        "nvHarr;":                   '\U00002904',
+        "nvdash;":                   '\U000022AC',
+        "nvinfin;":                  '\U000029DE',
+        "nvlArr;":                   '\U00002902',
+        "nvrArr;":                   '\U00002903',
+        "nwArr;":                    '\U000021D6',
+        "nwarhk;":                   '\U00002923',
+        "nwarr;":                    '\U00002196',
+        "nwarrow;":                  '\U00002196',
+        "nwnear;":                   '\U00002927',
+        "oS;":                       '\U000024C8',
+        "oacute;":                   '\U000000F3',
+        "oast;":                     '\U0000229B',
+        "ocir;":                     '\U0000229A',
+        "ocirc;":                    '\U000000F4',
+        "ocy;":                      '\U0000043E',
+        "odash;":                    '\U0000229D',
+        "odblac;":                   '\U00000151',
+        "odiv;":                     '\U00002A38',
+        "odot;":                     '\U00002299',
+        "odsold;":                   '\U000029BC',
+        "oelig;":                    '\U00000153',
+        "ofcir;":                    '\U000029BF',
+        "ofr;":                      '\U0001D52C',
+        "ogon;":                     '\U000002DB',
+        "ograve;":                   '\U000000F2',
+        "ogt;":                      '\U000029C1',
+        "ohbar;":                    '\U000029B5',
+        "ohm;":                      '\U000003A9',
+        "oint;":                     '\U0000222E',
+        "olarr;":                    '\U000021BA',
+        "olcir;":                    '\U000029BE',
+        "olcross;":                  '\U000029BB',
+        "oline;":                    '\U0000203E',
+        "olt;":                      '\U000029C0',
+        "omacr;":                    '\U0000014D',
+        "omega;":                    '\U000003C9',
+        "omicron;":                  '\U000003BF',
+        "omid;":                     '\U000029B6',
+        "ominus;":                   '\U00002296',
+        "oopf;":                     '\U0001D560',
+        "opar;":                     '\U000029B7',
+        "operp;":                    '\U000029B9',
+        "oplus;":                    '\U00002295',
+        "or;":                       '\U00002228',
+        "orarr;":                    '\U000021BB',
+        "ord;":                      '\U00002A5D',
+        "order;":                    '\U00002134',
+        "orderof;":                  '\U00002134',
+        "ordf;":                     '\U000000AA',
+        "ordm;":                     '\U000000BA',
+        "origof;":                   '\U000022B6',
+        "oror;":                     '\U00002A56',
+        "orslope;":                  '\U00002A57',
+        "orv;":                      '\U00002A5B',
+        "oscr;":                     '\U00002134',
+        "oslash;":                   '\U000000F8',
+        "osol;":                     '\U00002298',
+        "otilde;":                   '\U000000F5',
+        "otimes;":                   '\U00002297',
+        "otimesas;":                 '\U00002A36',
+        "ouml;":                     '\U000000F6',
+        "ovbar;":                    '\U0000233D',
+        "par;":                      '\U00002225',
+        "para;":                     '\U000000B6',
+        "parallel;":                 '\U00002225',
+        "parsim;":                   '\U00002AF3',
+        "parsl;":                    '\U00002AFD',
+        "part;":                     '\U00002202',
+        "pcy;":                      '\U0000043F',
+        "percnt;":                   '\U00000025',
+        "period;":                   '\U0000002E',
+        "permil;":                   '\U00002030',
+        "perp;":                     '\U000022A5',
+        "pertenk;":                  '\U00002031',
+        "pfr;":                      '\U0001D52D',
+        "phi;":                      '\U000003C6',
+        "phiv;":                     '\U000003D5',
+        "phmmat;":                   '\U00002133',
+        "phone;":                    '\U0000260E',
+        "pi;":                       '\U000003C0',
+        "pitchfork;":                '\U000022D4',
+        "piv;":                      '\U000003D6',
+        "planck;":                   '\U0000210F',
+        "planckh;":                  '\U0000210E',
+        "plankv;":                   '\U0000210F',
+        "plus;":                     '\U0000002B',
+        "plusacir;":                 '\U00002A23',
+        "plusb;":                    '\U0000229E',
+        "pluscir;":                  '\U00002A22',
+        "plusdo;":                   '\U00002214',
+        "plusdu;":                   '\U00002A25',
+        "pluse;":                    '\U00002A72',
+        "plusmn;":                   '\U000000B1',
+        "plussim;":                  '\U00002A26',
+        "plustwo;":                  '\U00002A27',
+        "pm;":                       '\U000000B1',
+        "pointint;":                 '\U00002A15',
+        "popf;":                     '\U0001D561',
+        "pound;":                    '\U000000A3',
+        "pr;":                       '\U0000227A',
+        "prE;":                      '\U00002AB3',
+        "prap;":                     '\U00002AB7',
+        "prcue;":                    '\U0000227C',
+        "pre;":                      '\U00002AAF',
+        "prec;":                     '\U0000227A',
+        "precapprox;":               '\U00002AB7',
+        "preccurlyeq;":              '\U0000227C',
+        "preceq;":                   '\U00002AAF',
+        "precnapprox;":              '\U00002AB9',
+        "precneqq;":                 '\U00002AB5',
+        "precnsim;":                 '\U000022E8',
+        "precsim;":                  '\U0000227E',
+        "prime;":                    '\U00002032',
+        "primes;":                   '\U00002119',
+        "prnE;":                     '\U00002AB5',
+        "prnap;":                    '\U00002AB9',
+        "prnsim;":                   '\U000022E8',
+        "prod;":                     '\U0000220F',
+        "profalar;":                 '\U0000232E',
+        "profline;":                 '\U00002312',
+        "profsurf;":                 '\U00002313',
+        "prop;":                     '\U0000221D',
+        "propto;":                   '\U0000221D',
+        "prsim;":                    '\U0000227E',
+        "prurel;":                   '\U000022B0',
+        "pscr;":                     '\U0001D4C5',
+        "psi;":                      '\U000003C8',
+        "puncsp;":                   '\U00002008',
+        "qfr;":                      '\U0001D52E',
+        "qint;":                     '\U00002A0C',
+        "qopf;":                     '\U0001D562',
+        "qprime;":                   '\U00002057',
+        "qscr;":                     '\U0001D4C6',
+        "quaternions;":              '\U0000210D',
+        "quatint;":                  '\U00002A16',
+        "quest;":                    '\U0000003F',
+        "questeq;":                  '\U0000225F',
+        "quot;":                     '\U00000022',
+        "rAarr;":                    '\U000021DB',
+        "rArr;":                     '\U000021D2',
+        "rAtail;":                   '\U0000291C',
+        "rBarr;":                    '\U0000290F',
+        "rHar;":                     '\U00002964',
+        "racute;":                   '\U00000155',
+        "radic;":                    '\U0000221A',
+        "raemptyv;":                 '\U000029B3',
+        "rang;":                     '\U000027E9',
+        "rangd;":                    '\U00002992',
+        "range;":                    '\U000029A5',
+        "rangle;":                   '\U000027E9',
+        "raquo;":                    '\U000000BB',
+        "rarr;":                     '\U00002192',
+        "rarrap;":                   '\U00002975',
+        "rarrb;":                    '\U000021E5',
+        "rarrbfs;":                  '\U00002920',
+        "rarrc;":                    '\U00002933',
+        "rarrfs;":                   '\U0000291E',
+        "rarrhk;":                   '\U000021AA',
+        "rarrlp;":                   '\U000021AC',
+        "rarrpl;":                   '\U00002945',
+        "rarrsim;":                  '\U00002974',
+        "rarrtl;":                   '\U000021A3',
+        "rarrw;":                    '\U0000219D',
+        "ratail;":                   '\U0000291A',
+        "ratio;":                    '\U00002236',
+        "rationals;":                '\U0000211A',
+        "rbarr;":                    '\U0000290D',
+        "rbbrk;":                    '\U00002773',
+        "rbrace;":                   '\U0000007D',
+        "rbrack;":                   '\U0000005D',
+        "rbrke;":                    '\U0000298C',
+        "rbrksld;":                  '\U0000298E',
+        "rbrkslu;":                  '\U00002990',
+        "rcaron;":                   '\U00000159',
+        "rcedil;":                   '\U00000157',
+        "rceil;":                    '\U00002309',
+        "rcub;":                     '\U0000007D',
+        "rcy;":                      '\U00000440',
+        "rdca;":                     '\U00002937',
+        "rdldhar;":                  '\U00002969',
+        "rdquo;":                    '\U0000201D',
+        "rdquor;":                   '\U0000201D',
+        "rdsh;":                     '\U000021B3',
+        "real;":                     '\U0000211C',
+        "realine;":                  '\U0000211B',
+        "realpart;":                 '\U0000211C',
+        "reals;":                    '\U0000211D',
+        "rect;":                     '\U000025AD',
+        "reg;":                      '\U000000AE',
+        "rfisht;":                   '\U0000297D',
+        "rfloor;":                   '\U0000230B',
+        "rfr;":                      '\U0001D52F',
+        "rhard;":                    '\U000021C1',
+        "rharu;":                    '\U000021C0',
+        "rharul;":                   '\U0000296C',
+        "rho;":                      '\U000003C1',
+        "rhov;":                     '\U000003F1',
+        "rightarrow;":               '\U00002192',
+        "rightarrowtail;":           '\U000021A3',
+        "rightharpoondown;":         '\U000021C1',
+        "rightharpoonup;":           '\U000021C0',
+        "rightleftarrows;":          '\U000021C4',
+        "rightleftharpoons;":        '\U000021CC',
+        "rightrightarrows;":         '\U000021C9',
+        "rightsquigarrow;":          '\U0000219D',
+        "rightthreetimes;":          '\U000022CC',
+        "ring;":                     '\U000002DA',
+        "risingdotseq;":             '\U00002253',
+        "rlarr;":                    '\U000021C4',
+        "rlhar;":                    '\U000021CC',
+        "rlm;":                      '\U0000200F',
+        "rmoust;":                   '\U000023B1',
+        "rmoustache;":               '\U000023B1',
+        "rnmid;":                    '\U00002AEE',
+        "roang;":                    '\U000027ED',
+        "roarr;":                    '\U000021FE',
+        "robrk;":                    '\U000027E7',
+        "ropar;":                    '\U00002986',
+        "ropf;":                     '\U0001D563',
+        "roplus;":                   '\U00002A2E',
+        "rotimes;":                  '\U00002A35',
+        "rpar;":                     '\U00000029',
+        "rpargt;":                   '\U00002994',
+        "rppolint;":                 '\U00002A12',
+        "rrarr;":                    '\U000021C9',
+        "rsaquo;":                   '\U0000203A',
+        "rscr;":                     '\U0001D4C7',
+        "rsh;":                      '\U000021B1',
+        "rsqb;":                     '\U0000005D',
+        "rsquo;":                    '\U00002019',
+        "rsquor;":                   '\U00002019',
+        "rthree;":                   '\U000022CC',
+        "rtimes;":                   '\U000022CA',
+        "rtri;":                     '\U000025B9',
+        "rtrie;":                    '\U000022B5',
+        "rtrif;":                    '\U000025B8',
+        "rtriltri;":                 '\U000029CE',
+        "ruluhar;":                  '\U00002968',
+        "rx;":                       '\U0000211E',
+        "sacute;":                   '\U0000015B',
+        "sbquo;":                    '\U0000201A',
+        "sc;":                       '\U0000227B',
+        "scE;":                      '\U00002AB4',
+        "scap;":                     '\U00002AB8',
+        "scaron;":                   '\U00000161',
+        "sccue;":                    '\U0000227D',
+        "sce;":                      '\U00002AB0',
+        "scedil;":                   '\U0000015F',
+        "scirc;":                    '\U0000015D',
+        "scnE;":                     '\U00002AB6',
+        "scnap;":                    '\U00002ABA',
+        "scnsim;":                   '\U000022E9',
+        "scpolint;":                 '\U00002A13',
+        "scsim;":                    '\U0000227F',
+        "scy;":                      '\U00000441',
+        "sdot;":                     '\U000022C5',
+        "sdotb;":                    '\U000022A1',
+        "sdote;":                    '\U00002A66',
+        "seArr;":                    '\U000021D8',
+        "searhk;":                   '\U00002925',
+        "searr;":                    '\U00002198',
+        "searrow;":                  '\U00002198',
+        "sect;":                     '\U000000A7',
+        "semi;":                     '\U0000003B',
+        "seswar;":                   '\U00002929',
+        "setminus;":                 '\U00002216',
+        "setmn;":                    '\U00002216',
+        "sext;":                     '\U00002736',
+        "sfr;":                      '\U0001D530',
+        "sfrown;":                   '\U00002322',
+        "sharp;":                    '\U0000266F',
+        "shchcy;":                   '\U00000449',
+        "shcy;":                     '\U00000448',
+        "shortmid;":                 '\U00002223',
+        "shortparallel;":            '\U00002225',
+        "shy;":                      '\U000000AD',
+        "sigma;":                    '\U000003C3',
+        "sigmaf;":                   '\U000003C2',
+        "sigmav;":                   '\U000003C2',
+        "sim;":                      '\U0000223C',
+        "simdot;":                   '\U00002A6A',
+        "sime;":                     '\U00002243',
+        "simeq;":                    '\U00002243',
+        "simg;":                     '\U00002A9E',
+        "simgE;":                    '\U00002AA0',
+        "siml;":                     '\U00002A9D',
+        "simlE;":                    '\U00002A9F',
+        "simne;":                    '\U00002246',
+        "simplus;":                  '\U00002A24',
+        "simrarr;":                  '\U00002972',
+        "slarr;":                    '\U00002190',
+        "smallsetminus;":            '\U00002216',
+        "smashp;":                   '\U00002A33',
+        "smeparsl;":                 '\U000029E4',
+        "smid;":                     '\U00002223',
+        "smile;":                    '\U00002323',
+        "smt;":                      '\U00002AAA',
+        "smte;":                     '\U00002AAC',
+        "softcy;":                   '\U0000044C',
+        "sol;":                      '\U0000002F',
+        "solb;":                     '\U000029C4',
+        "solbar;":                   '\U0000233F',
+        "sopf;":                     '\U0001D564',
+        "spades;":                   '\U00002660',
+        "spadesuit;":                '\U00002660',
+        "spar;":                     '\U00002225',
+        "sqcap;":                    '\U00002293',
+        "sqcup;":                    '\U00002294',
+        "sqsub;":                    '\U0000228F',
+        "sqsube;":                   '\U00002291',
+        "sqsubset;":                 '\U0000228F',
+        "sqsubseteq;":               '\U00002291',
+        "sqsup;":                    '\U00002290',
+        "sqsupe;":                   '\U00002292',
+        "sqsupset;":                 '\U00002290',
+        "sqsupseteq;":               '\U00002292',
+        "squ;":                      '\U000025A1',
+        "square;":                   '\U000025A1',
+        "squarf;":                   '\U000025AA',
+        "squf;":                     '\U000025AA',
+        "srarr;":                    '\U00002192',
+        "sscr;":                     '\U0001D4C8',
+        "ssetmn;":                   '\U00002216',
+        "ssmile;":                   '\U00002323',
+        "sstarf;":                   '\U000022C6',
+        "star;":                     '\U00002606',
+        "starf;":                    '\U00002605',
+        "straightepsilon;":          '\U000003F5',
+        "straightphi;":              '\U000003D5',
+        "strns;":                    '\U000000AF',
+        "sub;":                      '\U00002282',
+        "subE;":                     '\U00002AC5',
+        "subdot;":                   '\U00002ABD',
+        "sube;":                     '\U00002286',
+        "subedot;":                  '\U00002AC3',
+        "submult;":                  '\U00002AC1',
+        "subnE;":                    '\U00002ACB',
+        "subne;":                    '\U0000228A',
+        "subplus;":                  '\U00002ABF',
+        "subrarr;":                  '\U00002979',
+        "subset;":                   '\U00002282',
+        "subseteq;":                 '\U00002286',
+        "subseteqq;":                '\U00002AC5',
+        "subsetneq;":                '\U0000228A',
+        "subsetneqq;":               '\U00002ACB',
+        "subsim;":                   '\U00002AC7',
+        "subsub;":                   '\U00002AD5',
+        "subsup;":                   '\U00002AD3',
+        "succ;":                     '\U0000227B',
+        "succapprox;":               '\U00002AB8',
+        "succcurlyeq;":              '\U0000227D',
+        "succeq;":                   '\U00002AB0',
+        "succnapprox;":              '\U00002ABA',
+        "succneqq;":                 '\U00002AB6',
+        "succnsim;":                 '\U000022E9',
+        "succsim;":                  '\U0000227F',
+        "sum;":                      '\U00002211',
+        "sung;":                     '\U0000266A',
+        "sup;":                      '\U00002283',
+        "sup1;":                     '\U000000B9',
+        "sup2;":                     '\U000000B2',
+        "sup3;":                     '\U000000B3',
+        "supE;":                     '\U00002AC6',
+        "supdot;":                   '\U00002ABE',
+        "supdsub;":                  '\U00002AD8',
+        "supe;":                     '\U00002287',
+        "supedot;":                  '\U00002AC4',
+        "suphsol;":                  '\U000027C9',
+        "suphsub;":                  '\U00002AD7',
+        "suplarr;":                  '\U0000297B',
+        "supmult;":                  '\U00002AC2',
+        "supnE;":                    '\U00002ACC',
+        "supne;":                    '\U0000228B',
+        "supplus;":                  '\U00002AC0',
+        "supset;":                   '\U00002283',
+        "supseteq;":                 '\U00002287',
+        "supseteqq;":                '\U00002AC6',
+        "supsetneq;":                '\U0000228B',
+        "supsetneqq;":               '\U00002ACC',
+        "supsim;":                   '\U00002AC8',
+        "supsub;":                   '\U00002AD4',
+        "supsup;":                   '\U00002AD6',
+        "swArr;":                    '\U000021D9',
+        "swarhk;":                   '\U00002926',
+        "swarr;":                    '\U00002199',
+        "swarrow;":                  '\U00002199',
+        "swnwar;":                   '\U0000292A',
+        "szlig;":                    '\U000000DF',
+        "target;":                   '\U00002316',
+        "tau;":                      '\U000003C4',
+        "tbrk;":                     '\U000023B4',
+        "tcaron;":                   '\U00000165',
+        "tcedil;":                   '\U00000163',
+        "tcy;":                      '\U00000442',
+        "tdot;":                     '\U000020DB',
+        "telrec;":                   '\U00002315',
+        "tfr;":                      '\U0001D531',
+        "there4;":                   '\U00002234',
+        "therefore;":                '\U00002234',
+        "theta;":                    '\U000003B8',
+        "thetasym;":                 '\U000003D1',
+        "thetav;":                   '\U000003D1',
+        "thickapprox;":              '\U00002248',
+        "thicksim;":                 '\U0000223C',
+        "thinsp;":                   '\U00002009',
+        "thkap;":                    '\U00002248',
+        "thksim;":                   '\U0000223C',
+        "thorn;":                    '\U000000FE',
+        "tilde;":                    '\U000002DC',
+        "times;":                    '\U000000D7',
+        "timesb;":                   '\U000022A0',
+        "timesbar;":                 '\U00002A31',
+        "timesd;":                   '\U00002A30',
+        "tint;":                     '\U0000222D',
+        "toea;":                     '\U00002928',
+        "top;":                      '\U000022A4',
+        "topbot;":                   '\U00002336',
+        "topcir;":                   '\U00002AF1',
+        "topf;":                     '\U0001D565',
+        "topfork;":                  '\U00002ADA',
+        "tosa;":                     '\U00002929',
+        "tprime;":                   '\U00002034',
+        "trade;":                    '\U00002122',
+        "triangle;":                 '\U000025B5',
+        "triangledown;":             '\U000025BF',
+        "triangleleft;":             '\U000025C3',
+        "trianglelefteq;":           '\U000022B4',
+        "triangleq;":                '\U0000225C',
+        "triangleright;":            '\U000025B9',
+        "trianglerighteq;":          '\U000022B5',
+        "tridot;":                   '\U000025EC',
+        "trie;":                     '\U0000225C',
+        "triminus;":                 '\U00002A3A',
+        "triplus;":                  '\U00002A39',
+        "trisb;":                    '\U000029CD',
+        "tritime;":                  '\U00002A3B',
+        "trpezium;":                 '\U000023E2',
+        "tscr;":                     '\U0001D4C9',
+        "tscy;":                     '\U00000446',
+        "tshcy;":                    '\U0000045B',
+        "tstrok;":                   '\U00000167',
+        "twixt;":                    '\U0000226C',
+        "twoheadleftarrow;":         '\U0000219E',
+        "twoheadrightarrow;":        '\U000021A0',
+        "uArr;":                     '\U000021D1',
+        "uHar;":                     '\U00002963',
+        "uacute;":                   '\U000000FA',
+        "uarr;":                     '\U00002191',
+        "ubrcy;":                    '\U0000045E',
+        "ubreve;":                   '\U0000016D',
+        "ucirc;":                    '\U000000FB',
+        "ucy;":                      '\U00000443',
+        "udarr;":                    '\U000021C5',
+        "udblac;":                   '\U00000171',
+        "udhar;":                    '\U0000296E',
+        "ufisht;":                   '\U0000297E',
+        "ufr;":                      '\U0001D532',
+        "ugrave;":                   '\U000000F9',
+        "uharl;":                    '\U000021BF',
+        "uharr;":                    '\U000021BE',
+        "uhblk;":                    '\U00002580',
+        "ulcorn;":                   '\U0000231C',
+        "ulcorner;":                 '\U0000231C',
+        "ulcrop;":                   '\U0000230F',
+        "ultri;":                    '\U000025F8',
+        "umacr;":                    '\U0000016B',
+        "uml;":                      '\U000000A8',
+        "uogon;":                    '\U00000173',
+        "uopf;":                     '\U0001D566',
+        "uparrow;":                  '\U00002191',
+        "updownarrow;":              '\U00002195',
+        "upharpoonleft;":            '\U000021BF',
+        "upharpoonright;":           '\U000021BE',
+        "uplus;":                    '\U0000228E',
+        "upsi;":                     '\U000003C5',
+        "upsih;":                    '\U000003D2',
+        "upsilon;":                  '\U000003C5',
+        "upuparrows;":               '\U000021C8',
+        "urcorn;":                   '\U0000231D',
+        "urcorner;":                 '\U0000231D',
+        "urcrop;":                   '\U0000230E',
+        "uring;":                    '\U0000016F',
+        "urtri;":                    '\U000025F9',
+        "uscr;":                     '\U0001D4CA',
+        "utdot;":                    '\U000022F0',
+        "utilde;":                   '\U00000169',
+        "utri;":                     '\U000025B5',
+        "utrif;":                    '\U000025B4',
+        "uuarr;":                    '\U000021C8',
+        "uuml;":                     '\U000000FC',
+        "uwangle;":                  '\U000029A7',
+        "vArr;":                     '\U000021D5',
+        "vBar;":                     '\U00002AE8',
+        "vBarv;":                    '\U00002AE9',
+        "vDash;":                    '\U000022A8',
+        "vangrt;":                   '\U0000299C',
+        "varepsilon;":               '\U000003F5',
+        "varkappa;":                 '\U000003F0',
+        "varnothing;":               '\U00002205',
+        "varphi;":                   '\U000003D5',
+        "varpi;":                    '\U000003D6',
+        "varpropto;":                '\U0000221D',
+        "varr;":                     '\U00002195',
+        "varrho;":                   '\U000003F1',
+        "varsigma;":                 '\U000003C2',
+        "vartheta;":                 '\U000003D1',
+        "vartriangleleft;":          '\U000022B2',
+        "vartriangleright;":         '\U000022B3',
+        "vcy;":                      '\U00000432',
+        "vdash;":                    '\U000022A2',
+        "vee;":                      '\U00002228',
+        "veebar;":                   '\U000022BB',
+        "veeeq;":                    '\U0000225A',
+        "vellip;":                   '\U000022EE',
+        "verbar;":                   '\U0000007C',
+        "vert;":                     '\U0000007C',
+        "vfr;":                      '\U0001D533',
+        "vltri;":                    '\U000022B2',
+        "vopf;":                     '\U0001D567',
+        "vprop;":                    '\U0000221D',
+        "vrtri;":                    '\U000022B3',
+        "vscr;":                     '\U0001D4CB',
+        "vzigzag;":                  '\U0000299A',
+        "wcirc;":                    '\U00000175',
+        "wedbar;":                   '\U00002A5F',
+        "wedge;":                    '\U00002227',
+        "wedgeq;":                   '\U00002259',
+        "weierp;":                   '\U00002118',
+        "wfr;":                      '\U0001D534',
+        "wopf;":                     '\U0001D568',
+        "wp;":                       '\U00002118',
+        "wr;":                       '\U00002240',
+        "wreath;":                   '\U00002240',
+        "wscr;":                     '\U0001D4CC',
+        "xcap;":                     '\U000022C2',
+        "xcirc;":                    '\U000025EF',
+        "xcup;":                     '\U000022C3',
+        "xdtri;":                    '\U000025BD',
+        "xfr;":                      '\U0001D535',
+        "xhArr;":                    '\U000027FA',
+        "xharr;":                    '\U000027F7',
+        "xi;":                       '\U000003BE',
+        "xlArr;":                    '\U000027F8',
+        "xlarr;":                    '\U000027F5',
+        "xmap;":                     '\U000027FC',
+        "xnis;":                     '\U000022FB',
+        "xodot;":                    '\U00002A00',
+        "xopf;":                     '\U0001D569',
+        "xoplus;":                   '\U00002A01',
+        "xotime;":                   '\U00002A02',
+        "xrArr;":                    '\U000027F9',
+        "xrarr;":                    '\U000027F6',
+        "xscr;":                     '\U0001D4CD',
+        "xsqcup;":                   '\U00002A06',
+        "xuplus;":                   '\U00002A04',
+        "xutri;":                    '\U000025B3',
+        "xvee;":                     '\U000022C1',
+        "xwedge;":                   '\U000022C0',
+        "yacute;":                   '\U000000FD',
+        "yacy;":                     '\U0000044F',
+        "ycirc;":                    '\U00000177',
+        "ycy;":                      '\U0000044B',
+        "yen;":                      '\U000000A5',
+        "yfr;":                      '\U0001D536',
+        "yicy;":                     '\U00000457',
+        "yopf;":                     '\U0001D56A',
+        "yscr;":                     '\U0001D4CE',
+        "yucy;":                     '\U0000044E',
+        "yuml;":                     '\U000000FF',
+        "zacute;":                   '\U0000017A',
+        "zcaron;":                   '\U0000017E',
+        "zcy;":                      '\U00000437',
+        "zdot;":                     '\U0000017C',
+        "zeetrf;":                   '\U00002128',
+        "zeta;":                     '\U000003B6',
+        "zfr;":                      '\U0001D537',
+        "zhcy;":                     '\U00000436',
+        "zigrarr;":                  '\U000021DD',
+        "zopf;":                     '\U0001D56B',
+        "zscr;":                     '\U0001D4CF',
+        "zwj;":                      '\U0000200D',
+        "zwnj;":                     '\U0000200C',
+        "AElig":                     '\U000000C6',
+        "AMP":                       '\U00000026',
+        "Aacute":                    '\U000000C1',
+        "Acirc":                     '\U000000C2',
+        "Agrave":                    '\U000000C0',
+        "Aring":                     '\U000000C5',
+        "Atilde":                    '\U000000C3',
+        "Auml":                      '\U000000C4',
+        "COPY":                      '\U000000A9',
+        "Ccedil":                    '\U000000C7',
+        "ETH":                       '\U000000D0',
+        "Eacute":                    '\U000000C9',
+        "Ecirc":                     '\U000000CA',
+        "Egrave":                    '\U000000C8',
+        "Euml":                      '\U000000CB',
+        "GT":                        '\U0000003E',
+        "Iacute":                    '\U000000CD',
+        "Icirc":                     '\U000000CE',
+        "Igrave":                    '\U000000CC',
+        "Iuml":                      '\U000000CF',
+        "LT":                        '\U0000003C',
+        "Ntilde":                    '\U000000D1',
+        "Oacute":                    '\U000000D3',
+        "Ocirc":                     '\U000000D4',
+        "Ograve":                    '\U000000D2',
+        "Oslash":                    '\U000000D8',
+        "Otilde":                    '\U000000D5',
+        "Ouml":                      '\U000000D6',
+        "QUOT":                      '\U00000022',
+        "REG":                       '\U000000AE',
+        "THORN":                     '\U000000DE',
+        "Uacute":                    '\U000000DA',
+        "Ucirc":                     '\U000000DB',
+        "Ugrave":                    '\U000000D9',
+        "Uuml":                      '\U000000DC',
+        "Yacute":                    '\U000000DD',
+        "aacute":                    '\U000000E1',
+        "acirc":                     '\U000000E2',
+        "acute":                     '\U000000B4',
+        "aelig":                     '\U000000E6',
+        "agrave":                    '\U000000E0',
+        "amp":                       '\U00000026',
+        "aring":                     '\U000000E5',
+        "atilde":                    '\U000000E3',
+        "auml":                      '\U000000E4',
+        "brvbar":                    '\U000000A6',
+        "ccedil":                    '\U000000E7',
+        "cedil":                     '\U000000B8',
+        "cent":                      '\U000000A2',
+        "copy":                      '\U000000A9',
+        "curren":                    '\U000000A4',
+        "deg":                       '\U000000B0',
+        "divide":                    '\U000000F7',
+        "eacute":                    '\U000000E9',
+        "ecirc":                     '\U000000EA',
+        "egrave":                    '\U000000E8',
+        "eth":                       '\U000000F0',
+        "euml":                      '\U000000EB',
+        "frac12":                    '\U000000BD',
+        "frac14":                    '\U000000BC',
+        "frac34":                    '\U000000BE',
+        "gt":                        '\U0000003E',
+        "iacute":                    '\U000000ED',
+        "icirc":                     '\U000000EE',
+        "iexcl":                     '\U000000A1',
+        "igrave":                    '\U000000EC',
+        "iquest":                    '\U000000BF',
+        "iuml":                      '\U000000EF',
+        "laquo":                     '\U000000AB',
+        "lt":                        '\U0000003C',
+        "macr":                      '\U000000AF',
+        "micro":                     '\U000000B5',
+        "middot":                    '\U000000B7',
+        "nbsp":                      '\U000000A0',
+        "not":                       '\U000000AC',
+        "ntilde":                    '\U000000F1',
+        "oacute":                    '\U000000F3',
+        "ocirc":                     '\U000000F4',
+        "ograve":                    '\U000000F2',
+        "ordf":                      '\U000000AA',
+        "ordm":                      '\U000000BA',
+        "oslash":                    '\U000000F8',
+        "otilde":                    '\U000000F5',
+        "ouml":                      '\U000000F6',
+        "para":                      '\U000000B6',
+        "plusmn":                    '\U000000B1',
+        "pound":                     '\U000000A3',
+        "quot":                      '\U00000022',
+        "raquo":                     '\U000000BB',
+        "reg":                       '\U000000AE',
+        "sect":                      '\U000000A7',
+        "shy":                       '\U000000AD',
+        "sup1":                      '\U000000B9',
+        "sup2":                      '\U000000B2',
+        "sup3":                      '\U000000B3',
+        "szlig":                     '\U000000DF',
+        "thorn":                     '\U000000FE',
+        "times":                     '\U000000D7',
+        "uacute":                    '\U000000FA',
+        "ucirc":                     '\U000000FB',
+        "ugrave":                    '\U000000F9',
+        "uml":                       '\U000000A8',
+        "uuml":                      '\U000000FC',
+        "yacute":                    '\U000000FD',
+        "yen":                       '\U000000A5',
+        "yuml":                      '\U000000FF',
+}
+
+// HTML entities that are two unicode codepoints.
+var entity2 = map[string][2]rune{
+        // TODO(nigeltao): Handle replacements that are wider than their names.
+        // "nLt;":                     {'\u226A', '\u20D2'},
+        // "nGt;":                     {'\u226B', '\u20D2'},
+        "NotEqualTilde;":           {'\u2242', '\u0338'},
+        "NotGreaterFullEqual;":     {'\u2267', '\u0338'},
+        "NotGreaterGreater;":       {'\u226B', '\u0338'},
+        "NotGreaterSlantEqual;":    {'\u2A7E', '\u0338'},
+        "NotHumpDownHump;":         {'\u224E', '\u0338'},
+        "NotHumpEqual;":            {'\u224F', '\u0338'},
+        "NotLeftTriangleBar;":      {'\u29CF', '\u0338'},
+        "NotLessLess;":             {'\u226A', '\u0338'},
+        "NotLessSlantEqual;":       {'\u2A7D', '\u0338'},
+        "NotNestedGreaterGreater;": {'\u2AA2', '\u0338'},
+        "NotNestedLessLess;":       {'\u2AA1', '\u0338'},
+        "NotPrecedesEqual;":        {'\u2AAF', '\u0338'},
+        "NotRightTriangleBar;":     {'\u29D0', '\u0338'},
+        "NotSquareSubset;":         {'\u228F', '\u0338'},
+        "NotSquareSuperset;":       {'\u2290', '\u0338'},
+        "NotSubset;":               {'\u2282', '\u20D2'},
+        "NotSucceedsEqual;":        {'\u2AB0', '\u0338'},
+        "NotSucceedsTilde;":        {'\u227F', '\u0338'},
+        "NotSuperset;":             {'\u2283', '\u20D2'},
+        "ThickSpace;":              {'\u205F', '\u200A'},
+        "acE;":                     {'\u223E', '\u0333'},
+        "bne;":                     {'\u003D', '\u20E5'},
+        "bnequiv;":                 {'\u2261', '\u20E5'},
+        "caps;":                    {'\u2229', '\uFE00'},
+        "cups;":                    {'\u222A', '\uFE00'},
+        "fjlig;":                   {'\u0066', '\u006A'},
+        "gesl;":                    {'\u22DB', '\uFE00'},
+        "gvertneqq;":               {'\u2269', '\uFE00'},
+        "gvnE;":                    {'\u2269', '\uFE00'},
+        "lates;":                   {'\u2AAD', '\uFE00'},
+        "lesg;":                    {'\u22DA', '\uFE00'},
+        "lvertneqq;":               {'\u2268', '\uFE00'},
+        "lvnE;":                    {'\u2268', '\uFE00'},
+        "nGg;":                     {'\u22D9', '\u0338'},
+        "nGtv;":                    {'\u226B', '\u0338'},
+        "nLl;":                     {'\u22D8', '\u0338'},
+        "nLtv;":                    {'\u226A', '\u0338'},
+        "nang;":                    {'\u2220', '\u20D2'},
+        "napE;":                    {'\u2A70', '\u0338'},
+        "napid;":                   {'\u224B', '\u0338'},
+        "nbump;":                   {'\u224E', '\u0338'},
+        "nbumpe;":                  {'\u224F', '\u0338'},
+        "ncongdot;":                {'\u2A6D', '\u0338'},
+        "nedot;":                   {'\u2250', '\u0338'},
+        "nesim;":                   {'\u2242', '\u0338'},
+        "ngE;":                     {'\u2267', '\u0338'},
+        "ngeqq;":                   {'\u2267', '\u0338'},
+        "ngeqslant;":               {'\u2A7E', '\u0338'},
+        "nges;":                    {'\u2A7E', '\u0338'},
+        "nlE;":                     {'\u2266', '\u0338'},
+        "nleqq;":                   {'\u2266', '\u0338'},
+        "nleqslant;":               {'\u2A7D', '\u0338'},
+        "nles;":                    {'\u2A7D', '\u0338'},
+        "notinE;":                  {'\u22F9', '\u0338'},
+        "notindot;":                {'\u22F5', '\u0338'},
+        "nparsl;":                  {'\u2AFD', '\u20E5'},
+        "npart;":                   {'\u2202', '\u0338'},
+        "npre;":                    {'\u2AAF', '\u0338'},
+        "npreceq;":                 {'\u2AAF', '\u0338'},
+        "nrarrc;":                  {'\u2933', '\u0338'},
+        "nrarrw;":                  {'\u219D', '\u0338'},
+        "nsce;":                    {'\u2AB0', '\u0338'},
+        "nsubE;":                   {'\u2AC5', '\u0338'},
+        "nsubset;":                 {'\u2282', '\u20D2'},
+        "nsubseteqq;":              {'\u2AC5', '\u0338'},
+        "nsucceq;":                 {'\u2AB0', '\u0338'},
+        "nsupE;":                   {'\u2AC6', '\u0338'},
+        "nsupset;":                 {'\u2283', '\u20D2'},
+        "nsupseteqq;":              {'\u2AC6', '\u0338'},
+        "nvap;":                    {'\u224D', '\u20D2'},
+        "nvge;":                    {'\u2265', '\u20D2'},
+        "nvgt;":                    {'\u003E', '\u20D2'},
+        "nvle;":                    {'\u2264', '\u20D2'},
+        "nvlt;":                    {'\u003C', '\u20D2'},
+        "nvltrie;":                 {'\u22B4', '\u20D2'},
+        "nvrtrie;":                 {'\u22B5', '\u20D2'},
+        "nvsim;":                   {'\u223C', '\u20D2'},
+        "race;":                    {'\u223D', '\u0331'},
+        "smtes;":                   {'\u2AAC', '\uFE00'},
+        "sqcaps;":                  {'\u2293', '\uFE00'},
+        "sqcups;":                  {'\u2294', '\uFE00'},
+        "varsubsetneq;":            {'\u228A', '\uFE00'},
+        "varsubsetneqq;":           {'\u2ACB', '\uFE00'},
+        "varsupsetneq;":            {'\u228B', '\uFE00'},
+        "varsupsetneqq;":           {'\u2ACC', '\uFE00'},
+        "vnsub;":                   {'\u2282', '\u20D2'},
+        "vnsup;":                   {'\u2283', '\u20D2'},
+        "vsubnE;":                  {'\u2ACB', '\uFE00'},
+        "vsubne;":                  {'\u228A', '\uFE00'},
+        "vsupnE;":                  {'\u2ACC', '\uFE00'},
+        "vsupne;":                  {'\u228B', '\uFE00'},
+}
diff --git a/vendor/golang.org/x/net/html/escape.go b/vendor/golang.org/x/net/html/escape.go
new file mode 100644
index 0000000..d856139
--- /dev/null
+++ b/vendor/golang.org/x/net/html/escape.go
@@ -0,0 +1,258 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package html
+
+import (
+        "bytes"
+        "strings"
+        "unicode/utf8"
+)
+
+// These replacements permit compatibility with old numeric entities that
+// assumed Windows-1252 encoding.
+// https://html.spec.whatwg.org/multipage/syntax.html#consume-a-character-reference
+var replacementTable = [...]rune{
+        '\u20AC', // First entry is what 0x80 should be replaced with.
+        '\u0081',
+        '\u201A',
+        '\u0192',
+        '\u201E',
+        '\u2026',
+        '\u2020',
+        '\u2021',
+        '\u02C6',
+        '\u2030',
+        '\u0160',
+        '\u2039',
+        '\u0152',
+        '\u008D',
+        '\u017D',
+        '\u008F',
+        '\u0090',
+        '\u2018',
+        '\u2019',
+        '\u201C',
+        '\u201D',
+        '\u2022',
+        '\u2013',
+        '\u2014',
+        '\u02DC',
+        '\u2122',
+        '\u0161',
+        '\u203A',
+        '\u0153',
+        '\u009D',
+        '\u017E',
+        '\u0178', // Last entry is 0x9F.
+        // 0x00->'\uFFFD' is handled programmatically.
+        // 0x0D->'\u000D' is a no-op.
+}
+
+// unescapeEntity reads an entity like "&lt;" from b[src:] and writes the
+// corresponding "<" to b[dst:], returning the incremented dst and src cursors.
+// Precondition: b[src] == '&' && dst <= src.
+// attribute should be true if parsing an attribute value.
+func unescapeEntity(b []byte, dst, src int, attribute bool) (dst1, src1 int) {
+        // https://html.spec.whatwg.org/multipage/syntax.html#consume-a-character-reference
+
+        // i starts at 1 because we already know that s[0] == '&'.
+        i, s := 1, b[src:]
+
+        if len(s) <= 1 {
+                b[dst] = b[src]
+                return dst + 1, src + 1
+        }
+
+        if s[i] == '#' {
+                if len(s) <= 3 { // We need to have at least "&#.".
+                        b[dst] = b[src]
+                        return dst + 1, src + 1
+                }
+                i++
+                c := s[i]
+                hex := false
+                if c == 'x' || c == 'X' {
+                        hex = true
+                        i++
+                }
+
+                x := '\x00'
+                for i < len(s) {
+                        c = s[i]
+                        i++
+                        if hex {
+                                if '0' <= c && c <= '9' {
+                                        x = 16*x + rune(c) - '0'
+                                        continue
+                                } else if 'a' <= c && c <= 'f' {
+                                        x = 16*x + rune(c) - 'a' + 10
+                                        continue
+                                } else if 'A' <= c && c <= 'F' {
+                                        x = 16*x + rune(c) - 'A' + 10
+                                        continue
+                                }
+                        } else if '0' <= c && c <= '9' {
+                                x = 10*x + rune(c) - '0'
+                                continue
+                        }
+                        if c != ';' {
+                                i--
+                        }
+                        break
+                }
+
+                if i <= 3 { // No characters matched.
+                        b[dst] = b[src]
+                        return dst + 1, src + 1
+                }
+
+                if 0x80 <= x && x <= 0x9F {
+                        // Replace characters from Windows-1252 with UTF-8 equivalents.
+                        x = replacementTable[x-0x80]
+                } else if x == 0 || (0xD800 <= x && x <= 0xDFFF) || x > 0x10FFFF {
+                        // Replace invalid characters with the replacement character.
+                        x = '\uFFFD'
+                }
+
+                return dst + utf8.EncodeRune(b[dst:], x), src + i
+        }
+
+        // Consume the maximum number of characters possible, with the
+        // consumed characters matching one of the named references.
+
+        for i < len(s) {
+                c := s[i]
+                i++
+                // Lower-cased characters are more common in entities, so we check for them first.
+                if 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' || '0' <= c && c <= '9' {
+                        continue
+                }
+                if c != ';' {
+                        i--
+                }
+                break
+        }
+
+        entityName := string(s[1:i])
+        if entityName == "" {
+                // No-op.
+        } else if attribute && entityName[len(entityName)-1] != ';' && len(s) > i && s[i] == '=' {
+                // No-op.
+        } else if x := entity[entityName]; x != 0 {
+                return dst + utf8.EncodeRune(b[dst:], x), src + i
+        } else if x := entity2[entityName]; x[0] != 0 {
+                dst1 := dst + utf8.EncodeRune(b[dst:], x[0])
+                return dst1 + utf8.EncodeRune(b[dst1:], x[1]), src + i
+        } else if !attribute {
+                maxLen := len(entityName) - 1
+                if maxLen > longestEntityWithoutSemicolon {
+                        maxLen = longestEntityWithoutSemicolon
+                }
+                for j := maxLen; j > 1; j-- {
+                        if x := entity[entityName[:j]]; x != 0 {
+                                return dst + utf8.EncodeRune(b[dst:], x), src + j + 1
+                        }
+                }
+        }
+
+        dst1, src1 = dst+i, src+i
+        copy(b[dst:dst1], b[src:src1])
+        return dst1, src1
+}
+
+// unescape unescapes b's entities in-place, so that "a&lt;b" becomes "a<b".
+// attribute should be true if parsing an attribute value.
+func unescape(b []byte, attribute bool) []byte {
+        for i, c := range b {
+                if c == '&' {
+                        dst, src := unescapeEntity(b, i, i, attribute)
+                        for src < len(b) {
+                                c := b[src]
+                                if c == '&' {
+                                        dst, src = unescapeEntity(b, dst, src, attribute)
+                                } else {
+                                        b[dst] = c
+                                        dst, src = dst+1, src+1
+                                }
+                        }
+                        return b[0:dst]
+                }
+        }
+        return b
+}
+
+// lower lower-cases the A-Z bytes in b in-place, so that "aBc" becomes "abc".
+func lower(b []byte) []byte {
+        for i, c := range b {
+                if 'A' <= c && c <= 'Z' {
+                        b[i] = c + 'a' - 'A'
+                }
+        }
+        return b
+}
+
+const escapedChars = "&'<>\"\r"
+
+func escape(w writer, s string) error {
+        i := strings.IndexAny(s, escapedChars)
+        for i != -1 {
+                if _, err := w.WriteString(s[:i]); err != nil {
+                        return err
+                }
+                var esc string
+                switch s[i] {
+                case '&':
+                        esc = "&amp;"
+                case '\'':
+                        // "&#39;" is shorter than "&apos;" and apos was not in HTML until HTML5.
+                        esc = "&#39;"
+                case '<':
+                        esc = "&lt;"
+                case '>':
+                        esc = "&gt;"
+                case '"':
+                        // "&#34;" is shorter than "&quot;".
+                        esc = "&#34;"
+                case '\r':
+                        esc = "&#13;"
+                default:
+                        panic("unrecognized escape character")
+                }
+                s = s[i+1:]
+                if _, err := w.WriteString(esc); err != nil {
+                        return err
+                }
+                i = strings.IndexAny(s, escapedChars)
+        }
+        _, err := w.WriteString(s)
+        return err
+}
+
+// EscapeString escapes special characters like "<" to become "&lt;". It
+// escapes only five such characters: <, >, &, ' and ".
+// UnescapeString(EscapeString(s)) == s always holds, but the converse isn't
+// always true.
+func EscapeString(s string) string {
+        if strings.IndexAny(s, escapedChars) == -1 {
+                return s
+        }
+        var buf bytes.Buffer
+        escape(&buf, s)
+        return buf.String()
+}
+
+// UnescapeString unescapes entities like "&lt;" to become "<". It unescapes a
+// larger range of entities than EscapeString escapes. For example, "&aacute;"
+// unescapes to "á", as does "&#225;" and "&xE1;".
+// UnescapeString(EscapeString(s)) == s always holds, but the converse isn't
+// always true.
+func UnescapeString(s string) string {
+        for _, c := range s {
+                if c == '&' {
+                        return string(unescape([]byte(s), false))
+                }
+        }
+        return s
+}
diff --git a/vendor/golang.org/x/net/html/foreign.go b/vendor/golang.org/x/net/html/foreign.go
new file mode 100644
index 0000000..d3b3844
--- /dev/null
+++ b/vendor/golang.org/x/net/html/foreign.go
@@ -0,0 +1,226 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package html
+
+import (
+        "strings"
+)
+
+func adjustAttributeNames(aa []Attribute, nameMap map[string]string) {
+        for i := range aa {
+                if newName, ok := nameMap[aa[i].Key]; ok {
+                        aa[i].Key = newName
+                }
+        }
+}
+
+func adjustForeignAttributes(aa []Attribute) {
+        for i, a := range aa {
+                if a.Key == "" || a.Key[0] != 'x' {
+                        continue
+                }
+                switch a.Key {
+                case "xlink:actuate", "xlink:arcrole", "xlink:href", "xlink:role", "xlink:show",
+                        "xlink:title", "xlink:type", "xml:base", "xml:lang", "xml:space", "xmlns:xlink":
+                        j := strings.Index(a.Key, ":")
+                        aa[i].Namespace = a.Key[:j]
+                        aa[i].Key = a.Key[j+1:]
+                }
+        }
+}
+
+func htmlIntegrationPoint(n *Node) bool {
+        if n.Type != ElementNode {
+                return false
+        }
+        switch n.Namespace {
+        case "math":
+                if n.Data == "annotation-xml" {
+                        for _, a := range n.Attr {
+                                if a.Key == "encoding" {
+                                        val := strings.ToLower(a.Val)
+                                        if val == "text/html" || val == "application/xhtml+xml" {
+                                                return true
+                                        }
+                                }
+                        }
+                }
+        case "svg":
+                switch n.Data {
+                case "desc", "foreignObject", "title":
+                        return true
+                }
+        }
+        return false
+}
+
+func mathMLTextIntegrationPoint(n *Node) bool {
+        if n.Namespace != "math" {
+                return false
+        }
+        switch n.Data {
+        case "mi", "mo", "mn", "ms", "mtext":
+                return true
+        }
+        return false
+}
+
+// Section 12.2.5.5.
+var breakout = map[string]bool{
+        "b":          true,
+        "big":        true,
+        "blockquote": true,
+        "body":       true,
+        "br":         true,
+        "center":     true,
+        "code":       true,
+        "dd":         true,
+        "div":        true,
+        "dl":         true,
+        "dt":         true,
+        "em":         true,
+        "embed":      true,
+        "h1":         true,
+        "h2":         true,
+        "h3":         true,
+        "h4":         true,
+        "h5":         true,
+        "h6":         true,
+        "head":       true,
+        "hr":         true,
+        "i":          true,
+        "img":        true,
+        "li":         true,
+        "listing":    true,
+        "menu":       true,
+        "meta":       true,
+        "nobr":       true,
+        "ol":         true,
+        "p":          true,
+        "pre":        true,
+        "ruby":       true,
+        "s":          true,
+        "small":      true,
+        "span":       true,
+        "strong":     true,
+        "strike":     true,
+        "sub":        true,
+        "sup":        true,
+        "table":      true,
+        "tt":         true,
+        "u":          true,
+        "ul":         true,
+        "var":        true,
+}
+
+// Section 12.2.5.5.
+var svgTagNameAdjustments = map[string]string{
+        "altglyph":            "altGlyph",
+        "altglyphdef":         "altGlyphDef",
+        "altglyphitem":        "altGlyphItem",
+        "animatecolor":        "animateColor",
+        "animatemotion":       "animateMotion",
+        "animatetransform":    "animateTransform",
+        "clippath":            "clipPath",
+        "feblend":             "feBlend",
+        "fecolormatrix":       "feColorMatrix",
+        "fecomponenttransfer": "feComponentTransfer",
+        "fecomposite":         "feComposite",
+        "feconvolvematrix":    "feConvolveMatrix",
+        "fediffuselighting":   "feDiffuseLighting",
+        "fedisplacementmap":   "feDisplacementMap",
+        "fedistantlight":      "feDistantLight",
+        "feflood":             "feFlood",
+        "fefunca":             "feFuncA",
+        "fefuncb":             "feFuncB",
+        "fefuncg":             "feFuncG",
+        "fefuncr":             "feFuncR",
+        "fegaussianblur":      "feGaussianBlur",
+        "feimage":             "feImage",
+        "femerge":             "feMerge",
+        "femergenode":         "feMergeNode",
+        "femorphology":        "feMorphology",
+        "feoffset":            "feOffset",
+        "fepointlight":        "fePointLight",
+        "fespecularlighting":  "feSpecularLighting",
+        "fespotlight":         "feSpotLight",
+        "fetile":              "feTile",
+        "feturbulence":        "feTurbulence",
+        "foreignobject":       "foreignObject",
+        "glyphref":            "glyphRef",
+        "lineargradient":      "linearGradient",
+        "radialgradient":      "radialGradient",
+        "textpath":            "textPath",
+}
+
+// Section 12.2.5.1
+var mathMLAttributeAdjustments = map[string]string{
+        "definitionurl": "definitionURL",
+}
+
+var svgAttributeAdjustments = map[string]string{
+        "attributename":             "attributeName",
+        "attributetype":             "attributeType",
+        "basefrequency":             "baseFrequency",
+        "baseprofile":               "baseProfile",
+        "calcmode":                  "calcMode",
+        "clippathunits":             "clipPathUnits",
+        "contentscripttype":         "contentScriptType",
+        "contentstyletype":          "contentStyleType",
+        "diffuseconstant":           "diffuseConstant",
+        "edgemode":                  "edgeMode",
+        "externalresourcesrequired": "externalResourcesRequired",
+        "filterres":                 "filterRes",
+        "filterunits":               "filterUnits",
+        "glyphref":                  "glyphRef",
+        "gradienttransform":         "gradientTransform",
+        "gradientunits":             "gradientUnits",
+        "kernelmatrix":              "kernelMatrix",
+        "kernelunitlength":          "kernelUnitLength",
+        "keypoints":                 "keyPoints",
+        "keysplines":                "keySplines",
+        "keytimes":                  "keyTimes",
+        "lengthadjust":              "lengthAdjust",
+        "limitingconeangle":         "limitingConeAngle",
+        "markerheight":              "markerHeight",
+        "markerunits":               "markerUnits",
+        "markerwidth":               "markerWidth",
+        "maskcontentunits":          "maskContentUnits",
+        "maskunits":                 "maskUnits",
+        "numoctaves":                "numOctaves",
+        "pathlength":                "pathLength",
+        "patterncontentunits":       "patternContentUnits",
+        "patterntransform":          "patternTransform",
+        "patternunits":              "patternUnits",
+        "pointsatx":                 "pointsAtX",
+        "pointsaty":                 "pointsAtY",
+        "pointsatz":                 "pointsAtZ",
+        "preservealpha":             "preserveAlpha",
+        "preserveaspectratio":       "preserveAspectRatio",
+        "primitiveunits":            "primitiveUnits",
+        "refx":                      "refX",
+        "refy":                      "refY",
+        "repeatcount":               "repeatCount",
+        "repeatdur":                 "repeatDur",
+        "requiredextensions":        "requiredExtensions",
+        "requiredfeatures":          "requiredFeatures",
+        "specularconstant":          "specularConstant",
+        "specularexponent":          "specularExponent",
+        "spreadmethod":              "spreadMethod",
+        "startoffset":               "startOffset",
+        "stddeviation":              "stdDeviation",
+        "stitchtiles":               "stitchTiles",
+        "surfacescale":              "surfaceScale",
+        "systemlanguage":            "systemLanguage",
+        "tablevalues":               "tableValues",
+        "targetx":                   "targetX",
+        "targety":                   "targetY",
+        "textlength":                "textLength",
+        "viewbox":                   "viewBox",
+        "viewtarget":                "viewTarget",
+        "xchannelselector":          "xChannelSelector",
+        "ychannelselector":          "yChannelSelector",
+        "zoomandpan":                "zoomAndPan",
+}
diff --git a/vendor/golang.org/x/net/html/node.go b/vendor/golang.org/x/net/html/node.go
new file mode 100644
index 0000000..26b657a
--- /dev/null
+++ b/vendor/golang.org/x/net/html/node.go
@@ -0,0 +1,193 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package html
+
+import (
+        "golang.org/x/net/html/atom"
+)
+
+// A NodeType is the type of a Node.
+type NodeType uint32
+
+const (
+        ErrorNode NodeType = iota
+        TextNode
+        DocumentNode
+        ElementNode
+        CommentNode
+        DoctypeNode
+        scopeMarkerNode
+)
+
+// Section 12.2.3.3 says "scope markers are inserted when entering applet
+// elements, buttons, object elements, marquees, table cells, and table
+// captions, and are used to prevent formatting from 'leaking'".
+var scopeMarker = Node{Type: scopeMarkerNode}
+
+// A Node consists of a NodeType and some Data (tag name for element nodes,
+// content for text) and are part of a tree of Nodes. Element nodes may also
+// have a Namespace and contain a slice of Attributes. Data is unescaped, so
+// that it looks like "a<b" rather than "a&lt;b". For element nodes, DataAtom
+// is the atom for Data, or zero if Data is not a known tag name.
+//
+// An empty Namespace implies a "http://www.w3.org/1999/xhtml" namespace.
+// Similarly, "math" is short for "http://www.w3.org/1998/Math/MathML", and
+// "svg" is short for "http://www.w3.org/2000/svg".
+type Node struct {
+        Parent, FirstChild, LastChild, PrevSibling, NextSibling *Node
+
+        Type      NodeType
+        DataAtom  atom.Atom
+        Data      string
+        Namespace string
+        Attr      []Attribute
+}
+
+// InsertBefore inserts newChild as a child of n, immediately before oldChild
+// in the sequence of n's children. oldChild may be nil, in which case newChild
+// is appended to the end of n's children.
+//
+// It will panic if newChild already has a parent or siblings.
+func (n *Node) InsertBefore(newChild, oldChild *Node) {
+        if newChild.Parent != nil || newChild.PrevSibling != nil || newChild.NextSibling != nil {
+                panic("html: InsertBefore called for an attached child Node")
+        }
+        var prev, next *Node
+        if oldChild != nil {
+                prev, next = oldChild.PrevSibling, oldChild
+        } else {
+                prev = n.LastChild
+        }
+        if prev != nil {
+                prev.NextSibling = newChild
+        } else {
+                n.FirstChild = newChild
+        }
+        if next != nil {
+                next.PrevSibling = newChild
+        } else {
+                n.LastChild = newChild
+        }
+        newChild.Parent = n
+        newChild.PrevSibling = prev
+        newChild.NextSibling = next
+}
+
+// AppendChild adds a node c as a child of n.
+//
+// It will panic if c already has a parent or siblings.
+func (n *Node) AppendChild(c *Node) {
+        if c.Parent != nil || c.PrevSibling != nil || c.NextSibling != nil {
+                panic("html: AppendChild called for an attached child Node")
+        }
+        last := n.LastChild
+        if last != nil {
+                last.NextSibling = c
+        } else {
+                n.FirstChild = c
+        }
+        n.LastChild = c
+        c.Parent = n
+        c.PrevSibling = last
+}
+
+// RemoveChild removes a node c that is a child of n. Afterwards, c will have
+// no parent and no siblings.
+//
+// It will panic if c's parent is not n.
+func (n *Node) RemoveChild(c *Node) {
+        if c.Parent != n {
+                panic("html: RemoveChild called for a non-child Node")
+        }
+        if n.FirstChild == c {
+                n.FirstChild = c.NextSibling
+        }
+        if c.NextSibling != nil {
+                c.NextSibling.PrevSibling = c.PrevSibling
+        }
+        if n.LastChild == c {
+                n.LastChild = c.PrevSibling
+        }
+        if c.PrevSibling != nil {
+                c.PrevSibling.NextSibling = c.NextSibling
+        }
+        c.Parent = nil
+        c.PrevSibling = nil
+        c.NextSibling = nil
+}
+
+// reparentChildren reparents all of src's child nodes to dst.
+func reparentChildren(dst, src *Node) {
+        for {
+                child := src.FirstChild
+                if child == nil {
+                        break
+                }
+                src.RemoveChild(child)
+                dst.AppendChild(child)
+        }
+}
+
+// clone returns a new node with the same type, data and attributes.
+// The clone has no parent, no siblings and no children.
+func (n *Node) clone() *Node {
+        m := &Node{
+                Type:     n.Type,
+                DataAtom: n.DataAtom,
+                Data:     n.Data,
+                Attr:     make([]Attribute, len(n.Attr)),
+        }
+        copy(m.Attr, n.Attr)
+        return m
+}
+
+// nodeStack is a stack of nodes.
+type nodeStack []*Node
+
+// pop pops the stack. It will panic if s is empty.
+func (s *nodeStack) pop() *Node {
+        i := len(*s)
+        n := (*s)[i-1]
+        *s = (*s)[:i-1]
+        return n
+}
+
+// top returns the most recently pushed node, or nil if s is empty.
+func (s *nodeStack) top() *Node {
+        if i := len(*s); i > 0 {
+                return (*s)[i-1]
+        }
+        return nil
+}
+
+// index returns the index of the top-most occurrence of n in the stack, or -1
+// if n is not present.
+func (s *nodeStack) index(n *Node) int {
+        for i := len(*s) - 1; i >= 0; i-- {
+                if (*s)[i] == n {
+                        return i
+                }
+        }
+        return -1
+}
+
+// insert inserts a node at the given index.
+func (s *nodeStack) insert(i int, n *Node) {
+        (*s) = append(*s, nil)
+        copy((*s)[i+1:], (*s)[i:])
+        (*s)[i] = n
+}
+
+// remove removes a node from the stack. It is a no-op if n is not present.
+func (s *nodeStack) remove(n *Node) {
+        i := s.index(n)
+        if i == -1 {
+                return
+        }
+        copy((*s)[i:], (*s)[i+1:])
+        j := len(*s) - 1
+        (*s)[j] = nil
+        *s = (*s)[:j]
+}
diff --git a/vendor/golang.org/x/net/html/parse.go b/vendor/golang.org/x/net/html/parse.go
new file mode 100644
index 0000000..be4b2bf
--- /dev/null
+++ b/vendor/golang.org/x/net/html/parse.go
@@ -0,0 +1,2094 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package html
+
+import (
+        "errors"
+        "fmt"
+        "io"
+        "strings"
+
+        a "golang.org/x/net/html/atom"
+)
+
+// A parser implements the HTML5 parsing algorithm:
+// https://html.spec.whatwg.org/multipage/syntax.html#tree-construction
+type parser struct {
+        // tokenizer provides the tokens for the parser.
+        tokenizer *Tokenizer
+        // tok is the most recently read token.
+        tok Token
+        // Self-closing tags like <hr/> are treated as start tags, except that
+        // hasSelfClosingToken is set while they are being processed.
+        hasSelfClosingToken bool
+        // doc is the document root element.
+        doc *Node
+        // The stack of open elements (section 12.2.3.2) and active formatting
+        // elements (section 12.2.3.3).
+        oe, afe nodeStack
+        // Element pointers (section 12.2.3.4).
+        head, form *Node
+        // Other parsing state flags (section 12.2.3.5).
+        scripting, framesetOK bool
+        // im is the current insertion mode.
+        im insertionMode
+        // originalIM is the insertion mode to go back to after completing a text
+        // or inTableText insertion mode.
+        originalIM insertionMode
+        // fosterParenting is whether new elements should be inserted according to
+        // the foster parenting rules (section 12.2.5.3).
+        fosterParenting bool
+        // quirks is whether the parser is operating in "quirks mode."
+        quirks bool
+        // fragment is whether the parser is parsing an HTML fragment.
+        fragment bool
+        // context is the context element when parsing an HTML fragment
+        // (section 12.4).
+        context *Node
+}
+
+func (p *parser) top() *Node {
+        if n := p.oe.top(); n != nil {
+                return n
+        }
+        return p.doc
+}
+
+// Stop tags for use in popUntil. These come from section 12.2.3.2.
+var (
+        defaultScopeStopTags = map[string][]a.Atom{
+                "":     {a.Applet, a.Caption, a.Html, a.Table, a.Td, a.Th, a.Marquee, a.Object, a.Template},
+                "math": {a.AnnotationXml, a.Mi, a.Mn, a.Mo, a.Ms, a.Mtext},
+                "svg":  {a.Desc, a.ForeignObject, a.Title},
+        }
+)
+
+type scope int
+
+const (
+        defaultScope scope = iota
+        listItemScope
+        buttonScope
+        tableScope
+        tableRowScope
+        tableBodyScope
+        selectScope
+)
+
+// popUntil pops the stack of open elements at the highest element whose tag
+// is in matchTags, provided there is no higher element in the scope's stop
+// tags (as defined in section 12.2.3.2). It returns whether or not there was
+// such an element. If there was not, popUntil leaves the stack unchanged.
+//
+// For example, the set of stop tags for table scope is: "html", "table". If
+// the stack was:
+// ["html", "body", "font", "table", "b", "i", "u"]
+// then popUntil(tableScope, "font") would return false, but
+// popUntil(tableScope, "i") would return true and the stack would become:
+// ["html", "body", "font", "table", "b"]
+//
+// If an element's tag is in both the stop tags and matchTags, then the stack
+// will be popped and the function returns true (provided, of course, there was
+// no higher element in the stack that was also in the stop tags). For example,
+// popUntil(tableScope, "table") returns true and leaves:
+// ["html", "body", "font"]
+func (p *parser) popUntil(s scope, matchTags ...a.Atom) bool {
+        if i := p.indexOfElementInScope(s, matchTags...); i != -1 {
+                p.oe = p.oe[:i]
+                return true
+        }
+        return false
+}
+
+// indexOfElementInScope returns the index in p.oe of the highest element whose
+// tag is in matchTags that is in scope. If no matching element is in scope, it
+// returns -1.
+func (p *parser) indexOfElementInScope(s scope, matchTags ...a.Atom) int {
+        for i := len(p.oe) - 1; i >= 0; i-- {
+                tagAtom := p.oe[i].DataAtom
+                if p.oe[i].Namespace == "" {
+                        for _, t := range matchTags {
+                                if t == tagAtom {
+                                        return i
+                                }
+                        }
+                        switch s {
+                        case defaultScope:
+                                // No-op.
+                        case listItemScope:
+                                if tagAtom == a.Ol || tagAtom == a.Ul {
+                                        return -1
+                                }
+                        case buttonScope:
+                                if tagAtom == a.Button {
+                                        return -1
+                                }
+                        case tableScope:
+                                if tagAtom == a.Html || tagAtom == a.Table {
+                                        return -1
+                                }
+                        case selectScope:
+                                if tagAtom != a.Optgroup && tagAtom != a.Option {
+                                        return -1
+                                }
+                        default:
+                                panic("unreachable")
+                        }
+                }
+                switch s {
+                case defaultScope, listItemScope, buttonScope:
+                        for _, t := range defaultScopeStopTags[p.oe[i].Namespace] {
+                                if t == tagAtom {
+                                        return -1
+                                }
+                        }
+                }
+        }
+        return -1
+}
+
+// elementInScope is like popUntil, except that it doesn't modify the stack of
+// open elements.
+func (p *parser) elementInScope(s scope, matchTags ...a.Atom) bool {
+        return p.indexOfElementInScope(s, matchTags...) != -1
+}
+
+// clearStackToContext pops elements off the stack of open elements until a
+// scope-defined element is found.
+func (p *parser) clearStackToContext(s scope) {
+        for i := len(p.oe) - 1; i >= 0; i-- {
+                tagAtom := p.oe[i].DataAtom
+                switch s {
+                case tableScope:
+                        if tagAtom == a.Html || tagAtom == a.Table {
+                                p.oe = p.oe[:i+1]
+                                return
+                        }
+                case tableRowScope:
+                        if tagAtom == a.Html || tagAtom == a.Tr {
+                                p.oe = p.oe[:i+1]
+                                return
+                        }
+                case tableBodyScope:
+                        if tagAtom == a.Html || tagAtom == a.Tbody || tagAtom == a.Tfoot || tagAtom == a.Thead {
+                                p.oe = p.oe[:i+1]
+                                return
+                        }
+                default:
+                        panic("unreachable")
+                }
+        }
+}
+
+// generateImpliedEndTags pops nodes off the stack of open elements as long as
+// the top node has a tag name of dd, dt, li, option, optgroup, p, rp, or rt.
+// If exceptions are specified, nodes with that name will not be popped off.
+func (p *parser) generateImpliedEndTags(exceptions ...string) {
+        var i int
+loop:
+        for i = len(p.oe) - 1; i >= 0; i-- {
+                n := p.oe[i]
+                if n.Type == ElementNode {
+                        switch n.DataAtom {
+                        case a.Dd, a.Dt, a.Li, a.Option, a.Optgroup, a.P, a.Rp, a.Rt:
+                                for _, except := range exceptions {
+                                        if n.Data == except {
+                                                break loop
+                                        }
+                                }
+                                continue
+                        }
+                }
+                break
+        }
+
+        p.oe = p.oe[:i+1]
+}
+
+// addChild adds a child node n to the top element, and pushes n onto the stack
+// of open elements if it is an element node.
+func (p *parser) addChild(n *Node) {
+        if p.shouldFosterParent() {
+                p.fosterParent(n)
+        } else {
+                p.top().AppendChild(n)
+        }
+
+        if n.Type == ElementNode {
+                p.oe = append(p.oe, n)
+        }
+}
+
+// shouldFosterParent returns whether the next node to be added should be
+// foster parented.
+func (p *parser) shouldFosterParent() bool {
+        if p.fosterParenting {
+                switch p.top().DataAtom {
+                case a.Table, a.Tbody, a.Tfoot, a.Thead, a.Tr:
+                        return true
+                }
+        }
+        return false
+}
+
+// fosterParent adds a child node according to the foster parenting rules.
+// Section 12.2.5.3, "foster parenting".
+func (p *parser) fosterParent(n *Node) {
+        var table, parent, prev *Node
+        var i int
+        for i = len(p.oe) - 1; i >= 0; i-- {
+                if p.oe[i].DataAtom == a.Table {
+                        table = p.oe[i]
+                        break
+                }
+        }
+
+        if table == nil {
+                // The foster parent is the html element.
+                parent = p.oe[0]
+        } else {
+                parent = table.Parent
+        }
+        if parent == nil {
+                parent = p.oe[i-1]
+        }
+
+        if table != nil {
+                prev = table.PrevSibling
+        } else {
+                prev = parent.LastChild
+        }
+        if prev != nil && prev.Type == TextNode && n.Type == TextNode {
+                prev.Data += n.Data
+                return
+        }
+
+        parent.InsertBefore(n, table)
+}
+
+// addText adds text to the preceding node if it is a text node, or else it
+// calls addChild with a new text node.
+func (p *parser) addText(text string) {
+        if text == "" {
+                return
+        }
+
+        if p.shouldFosterParent() {
+                p.fosterParent(&Node{
+                        Type: TextNode,
+                        Data: text,
+                })
+                return
+        }
+
+        t := p.top()
+        if n := t.LastChild; n != nil && n.Type == TextNode {
+                n.Data += text
+                return
+        }
+        p.addChild(&Node{
+                Type: TextNode,
+                Data: text,
+        })
+}
+
+// addElement adds a child element based on the current token.
+func (p *parser) addElement() {
+        p.addChild(&Node{
+                Type:     ElementNode,
+                DataAtom: p.tok.DataAtom,
+                Data:     p.tok.Data,
+                Attr:     p.tok.Attr,
+        })
+}
+
+// Section 12.2.3.3.
+func (p *parser) addFormattingElement() {
+        tagAtom, attr := p.tok.DataAtom, p.tok.Attr
+        p.addElement()
+
+        // Implement the Noah's Ark clause, but with three per family instead of two.
+        identicalElements := 0
+findIdenticalElements:
+        for i := len(p.afe) - 1; i >= 0; i-- {
+                n := p.afe[i]
+                if n.Type == scopeMarkerNode {
+                        break
+                }
+                if n.Type != ElementNode {
+                        continue
+                }
+                if n.Namespace != "" {
+                        continue
+                }
+                if n.DataAtom != tagAtom {
+                        continue
+                }
+                if len(n.Attr) != len(attr) {
+                        continue
+                }
+        compareAttributes:
+                for _, t0 := range n.Attr {
+                        for _, t1 := range attr {
+                                if t0.Key == t1.Key && t0.Namespace == t1.Namespace && t0.Val == t1.Val {
+                                        // Found a match for this attribute, continue with the next attribute.
+                                        continue compareAttributes
+                                }
+                        }
+                        // If we get here, there is no attribute that matches a.
+                        // Therefore the element is not identical to the new one.
+                        continue findIdenticalElements
+                }
+
+                identicalElements++
+                if identicalElements >= 3 {
+                        p.afe.remove(n)
+                }
+        }
+
+        p.afe = append(p.afe, p.top())
+}
+
+// Section 12.2.3.3.
+func (p *parser) clearActiveFormattingElements() {
+        for {
+                n := p.afe.pop()
+                if len(p.afe) == 0 || n.Type == scopeMarkerNode {
+                        return
+                }
+        }
+}
+
+// Section 12.2.3.3.
+func (p *parser) reconstructActiveFormattingElements() {
+        n := p.afe.top()
+        if n == nil {
+                return
+        }
+        if n.Type == scopeMarkerNode || p.oe.index(n) != -1 {
+                return
+        }
+        i := len(p.afe) - 1
+        for n.Type != scopeMarkerNode && p.oe.index(n) == -1 {
+                if i == 0 {
+                        i = -1
+                        break
+                }
+                i--
+                n = p.afe[i]
+        }
+        for {
+                i++
+                clone := p.afe[i].clone()
+                p.addChild(clone)
+                p.afe[i] = clone
+                if i == len(p.afe)-1 {
+                        break
+                }
+        }
+}
+
+// Section 12.2.4.
+func (p *parser) acknowledgeSelfClosingTag() {
+        p.hasSelfClosingToken = false
+}
+
+// An insertion mode (section 12.2.3.1) is the state transition function from
+// a particular state in the HTML5 parser's state machine. It updates the
+// parser's fields depending on parser.tok (where ErrorToken means EOF).
+// It returns whether the token was consumed.
+type insertionMode func(*parser) bool
+
+// setOriginalIM sets the insertion mode to return to after completing a text or
+// inTableText insertion mode.
+// Section 12.2.3.1, "using the rules for".
+func (p *parser) setOriginalIM() {
+        if p.originalIM != nil {
+                panic("html: bad parser state: originalIM was set twice")
+        }
+        p.originalIM = p.im
+}
+
+// Section 12.2.3.1, "reset the insertion mode".
+func (p *parser) resetInsertionMode() {
+        for i := len(p.oe) - 1; i >= 0; i-- {
+                n := p.oe[i]
+                if i == 0 && p.context != nil {
+                        n = p.context
+                }
+
+                switch n.DataAtom {
+                case a.Select:
+                        p.im = inSelectIM
+                case a.Td, a.Th:
+                        p.im = inCellIM
+                case a.Tr:
+                        p.im = inRowIM
+                case a.Tbody, a.Thead, a.Tfoot:
+                        p.im = inTableBodyIM
+                case a.Caption:
+                        p.im = inCaptionIM
+                case a.Colgroup:
+                        p.im = inColumnGroupIM
+                case a.Table:
+                        p.im = inTableIM
+                case a.Head:
+                        p.im = inBodyIM
+                case a.Body:
+                        p.im = inBodyIM
+                case a.Frameset:
+                        p.im = inFramesetIM
+                case a.Html:
+                        p.im = beforeHeadIM
+                default:
+                        continue
+                }
+                return
+        }
+        p.im = inBodyIM
+}
+
+const whitespace = " \t\r\n\f"
+
+// Section 12.2.5.4.1.
+func initialIM(p *parser) bool {
+        switch p.tok.Type {
+        case TextToken:
+                p.tok.Data = strings.TrimLeft(p.tok.Data, whitespace)
+                if len(p.tok.Data) == 0 {
+                        // It was all whitespace, so ignore it.
+                        return true
+                }
+        case CommentToken:
+                p.doc.AppendChild(&Node{
+                        Type: CommentNode,
+                        Data: p.tok.Data,
+                })
+                return true
+        case DoctypeToken:
+                n, quirks := parseDoctype(p.tok.Data)
+                p.doc.AppendChild(n)
+                p.quirks = quirks
+                p.im = beforeHTMLIM
+                return true
+        }
+        p.quirks = true
+        p.im = beforeHTMLIM
+        return false
+}
+
+// Section 12.2.5.4.2.
+func beforeHTMLIM(p *parser) bool {
+        switch p.tok.Type {
+        case DoctypeToken:
+                // Ignore the token.
+                return true
+        case TextToken:
+                p.tok.Data = strings.TrimLeft(p.tok.Data, whitespace)
+                if len(p.tok.Data) == 0 {
+                        // It was all whitespace, so ignore it.
+                        return true
+                }
+        case StartTagToken:
+                if p.tok.DataAtom == a.Html {
+                        p.addElement()
+                        p.im = beforeHeadIM
+                        return true
+                }
+        case EndTagToken:
+                switch p.tok.DataAtom {
+                case a.Head, a.Body, a.Html, a.Br:
+                        p.parseImpliedToken(StartTagToken, a.Html, a.Html.String())
+                        return false
+                default:
+                        // Ignore the token.
+                        return true
+                }
+        case CommentToken:
+                p.doc.AppendChild(&Node{
+                        Type: CommentNode,
+                        Data: p.tok.Data,
+                })
+                return true
+        }
+        p.parseImpliedToken(StartTagToken, a.Html, a.Html.String())
+        return false
+}
+
+// Section 12.2.5.4.3.
+func beforeHeadIM(p *parser) bool {
+        switch p.tok.Type {
+        case TextToken:
+                p.tok.Data = strings.TrimLeft(p.tok.Data, whitespace)
+                if len(p.tok.Data) == 0 {
+                        // It was all whitespace, so ignore it.
+                        return true
+                }
+        case StartTagToken:
+                switch p.tok.DataAtom {
+                case a.Head:
+                        p.addElement()
+                        p.head = p.top()
+                        p.im = inHeadIM
+                        return true
+                case a.Html:
+                        return inBodyIM(p)
+                }
+        case EndTagToken:
+                switch p.tok.DataAtom {
+                case a.Head, a.Body, a.Html, a.Br:
+                        p.parseImpliedToken(StartTagToken, a.Head, a.Head.String())
+                        return false
+                default:
+                        // Ignore the token.
+                        return true
+                }
+        case CommentToken:
+                p.addChild(&Node{
+                        Type: CommentNode,
+                        Data: p.tok.Data,
+                })
+                return true
+        case DoctypeToken:
+                // Ignore the token.
+                return true
+        }
+
+        p.parseImpliedToken(StartTagToken, a.Head, a.Head.String())
+        return false
+}
+
+// Section 12.2.5.4.4.
+func inHeadIM(p *parser) bool {
+        switch p.tok.Type {
+        case TextToken:
+                s := strings.TrimLeft(p.tok.Data, whitespace)
+                if len(s) < len(p.tok.Data) {
+                        // Add the initial whitespace to the current node.
+                        p.addText(p.tok.Data[:len(p.tok.Data)-len(s)])
+                        if s == "" {
+                                return true
+                        }
+                        p.tok.Data = s
+                }
+        case StartTagToken:
+                switch p.tok.DataAtom {
+                case a.Html:
+                        return inBodyIM(p)
+                case a.Base, a.Basefont, a.Bgsound, a.Command, a.Link, a.Meta:
+                        p.addElement()
+                        p.oe.pop()
+                        p.acknowledgeSelfClosingTag()
+                        return true
+                case a.Script, a.Title, a.Noscript, a.Noframes, a.Style:
+                        p.addElement()
+                        p.setOriginalIM()
+                        p.im = textIM
+                        return true
+                case a.Head:
+                        // Ignore the token.
+                        return true
+                }
+        case EndTagToken:
+                switch p.tok.DataAtom {
+                case a.Head:
+                        n := p.oe.pop()
+                        if n.DataAtom != a.Head {
+                                panic("html: bad parser state: <head> element not found, in the in-head insertion mode")
+                        }
+                        p.im = afterHeadIM
+                        return true
+                case a.Body, a.Html, a.Br:
+                        p.parseImpliedToken(EndTagToken, a.Head, a.Head.String())
+                        return false
+                default:
+                        // Ignore the token.
+                        return true
+                }
+        case CommentToken:
+                p.addChild(&Node{
+                        Type: CommentNode,
+                        Data: p.tok.Data,
+                })
+                return true
+        case DoctypeToken:
+                // Ignore the token.
+                return true
+        }
+
+        p.parseImpliedToken(EndTagToken, a.Head, a.Head.String())
+        return false
+}
+
+// Section 12.2.5.4.6.
+func afterHeadIM(p *parser) bool {
+        switch p.tok.Type {
+        case TextToken:
+                s := strings.TrimLeft(p.tok.Data, whitespace)
+                if len(s) < len(p.tok.Data) {
+                        // Add the initial whitespace to the current node.
+                        p.addText(p.tok.Data[:len(p.tok.Data)-len(s)])
+                        if s == "" {
+                                return true
+                        }
+                        p.tok.Data = s
+                }
+        case StartTagToken:
+                switch p.tok.DataAtom {
+                case a.Html:
+                        return inBodyIM(p)
+                case a.Body:
+                        p.addElement()
+                        p.framesetOK = false
+                        p.im = inBodyIM
+                        return true
+                case a.Frameset:
+                        p.addElement()
+                        p.im = inFramesetIM
+                        return true
+                case a.Base, a.Basefont, a.Bgsound, a.Link, a.Meta, a.Noframes, a.Script, a.Style, a.Title:
+                        p.oe = append(p.oe, p.head)
+                        defer p.oe.remove(p.head)
+                        return inHeadIM(p)
+                case a.Head:
+                        // Ignore the token.
+                        return true
+                }
+        case EndTagToken:
+                switch p.tok.DataAtom {
+                case a.Body, a.Html, a.Br:
+                        // Drop down to creating an implied <body> tag.
+                default:
+                        // Ignore the token.
+                        return true
+                }
+        case CommentToken:
+                p.addChild(&Node{
+                        Type: CommentNode,
+                        Data: p.tok.Data,
+                })
+                return true
+        case DoctypeToken:
+                // Ignore the token.
+                return true
+        }
+
+        p.parseImpliedToken(StartTagToken, a.Body, a.Body.String())
+        p.framesetOK = true
+        return false
+}
+
+// copyAttributes copies attributes of src not found on dst to dst.
+func copyAttributes(dst *Node, src Token) {
+        if len(src.Attr) == 0 {
+                return
+        }
+        attr := map[string]string{}
+        for _, t := range dst.Attr {
+                attr[t.Key] = t.Val
+        }
+        for _, t := range src.Attr {
+                if _, ok := attr[t.Key]; !ok {
+                        dst.Attr = append(dst.Attr, t)
+                        attr[t.Key] = t.Val
+                }
+        }
+}
+
+// Section 12.2.5.4.7.
+func inBodyIM(p *parser) bool {
+        switch p.tok.Type {
+        case TextToken:
+                d := p.tok.Data
+                switch n := p.oe.top(); n.DataAtom {
+                case a.Pre, a.Listing:
+                        if n.FirstChild == nil {
+                                // Ignore a newline at the start of a <pre> block.
+                                if d != "" && d[0] == '\r' {
+                                        d = d[1:]
+                                }
+                                if d != "" && d[0] == '\n' {
+                                        d = d[1:]
+                                }
+                        }
+                }
+                d = strings.Replace(d, "\x00", "", -1)
+                if d == "" {
+                        return true
+                }
+                p.reconstructActiveFormattingElements()
+                p.addText(d)
+                if p.framesetOK && strings.TrimLeft(d, whitespace) != "" {
+                        // There were non-whitespace characters inserted.
+                        p.framesetOK = false
+                }
+        case StartTagToken:
+                switch p.tok.DataAtom {
+                case a.Html:
+                        copyAttributes(p.oe[0], p.tok)
+                case a.Base, a.Basefont, a.Bgsound, a.Command, a.Link, a.Meta, a.Noframes, a.Script, a.Style, a.Title:
+                        return inHeadIM(p)
+                case a.Body:
+                        if len(p.oe) >= 2 {
+                                body := p.oe[1]
+                                if body.Type == ElementNode && body.DataAtom == a.Body {
+                                        p.framesetOK = false
+                                        copyAttributes(body, p.tok)
+                                }
+                        }
+                case a.Frameset:
+                        if !p.framesetOK || len(p.oe) < 2 || p.oe[1].DataAtom != a.Body {
+                                // Ignore the token.
+                                return true
+                        }
+                        body := p.oe[1]
+                        if body.Parent != nil {
+                                body.Parent.RemoveChild(body)
+                        }
+                        p.oe = p.oe[:1]
+                        p.addElement()
+                        p.im = inFramesetIM
+                        return true
+                case a.Address, a.Article, a.Aside, a.Blockquote, a.Center, a.Details, a.Dir, a.Div, a.Dl, a.Fieldset, a.Figcaption, a.Figure, a.Footer, a.Header, a.Hgroup, a.Menu, a.Nav, a.Ol, a.P, a.Section, a.Summary, a.Ul:
+                        p.popUntil(buttonScope, a.P)
+                        p.addElement()
+                case a.H1, a.H2, a.H3, a.H4, a.H5, a.H6:
+                        p.popUntil(buttonScope, a.P)
+                        switch n := p.top(); n.DataAtom {
+                        case a.H1, a.H2, a.H3, a.H4, a.H5, a.H6:
+                                p.oe.pop()
+                        }
+                        p.addElement()
+                case a.Pre, a.Listing:
+                        p.popUntil(buttonScope, a.P)
+                        p.addElement()
+                        // The newline, if any, will be dealt with by the TextToken case.
+                        p.framesetOK = false
+                case a.Form:
+                        if p.form == nil {
+                                p.popUntil(buttonScope, a.P)
+                                p.addElement()
+                                p.form = p.top()
+                        }
+                case a.Li:
+                        p.framesetOK = false
+                        for i := len(p.oe) - 1; i >= 0; i-- {
+                                node := p.oe[i]
+                                switch node.DataAtom {
+                                case a.Li:
+                                        p.oe = p.oe[:i]
+                                case a.Address, a.Div, a.P:
+                                        continue
+                                default:
+                                        if !isSpecialElement(node) {
+                                                continue
+                                        }
+                                }
+                                break
+                        }
+                        p.popUntil(buttonScope, a.P)
+                        p.addElement()
+                case a.Dd, a.Dt:
+                        p.framesetOK = false
+                        for i := len(p.oe) - 1; i >= 0; i-- {
+                                node := p.oe[i]
+                                switch node.DataAtom {
+                                case a.Dd, a.Dt:
+                                        p.oe = p.oe[:i]
+                                case a.Address, a.Div, a.P:
+                                        continue
+                                default:
+                                        if !isSpecialElement(node) {
+                                                continue
+                                        }
+                                }
+                                break
+                        }
+                        p.popUntil(buttonScope, a.P)
+                        p.addElement()
+                case a.Plaintext:
+                        p.popUntil(buttonScope, a.P)
+                        p.addElement()
+                case a.Button:
+                        p.popUntil(defaultScope, a.Button)
+                        p.reconstructActiveFormattingElements()
+                        p.addElement()
+                        p.framesetOK = false
+                case a.A:
+                        for i := len(p.afe) - 1; i >= 0 && p.afe[i].Type != scopeMarkerNode; i-- {
+                                if n := p.afe[i]; n.Type == ElementNode && n.DataAtom == a.A {
+                                        p.inBodyEndTagFormatting(a.A)
+                                        p.oe.remove(n)
+                                        p.afe.remove(n)
+                                        break
+                                }
+                        }
+                        p.reconstructActiveFormattingElements()
+                        p.addFormattingElement()
+                case a.B, a.Big, a.Code, a.Em, a.Font, a.I, a.S, a.Small, a.Strike, a.Strong, a.Tt, a.U:
+                        p.reconstructActiveFormattingElements()
+                        p.addFormattingElement()
+                case a.Nobr:
+                        p.reconstructActiveFormattingElements()
+                        if p.elementInScope(defaultScope, a.Nobr) {
+                                p.inBodyEndTagFormatting(a.Nobr)
+                                p.reconstructActiveFormattingElements()
+                        }
+                        p.addFormattingElement()
+                case a.Applet, a.Marquee, a.Object:
+                        p.reconstructActiveFormattingElements()
+                        p.addElement()
+                        p.afe = append(p.afe, &scopeMarker)
+                        p.framesetOK = false
+                case a.Table:
+                        if !p.quirks {
+                                p.popUntil(buttonScope, a.P)
+                        }
+                        p.addElement()
+                        p.framesetOK = false
+                        p.im = inTableIM
+                        return true
+                case a.Area, a.Br, a.Embed, a.Img, a.Input, a.Keygen, a.Wbr:
+                        p.reconstructActiveFormattingElements()
+                        p.addElement()
+                        p.oe.pop()
+                        p.acknowledgeSelfClosingTag()
+                        if p.tok.DataAtom == a.Input {
+                                for _, t := range p.tok.Attr {
+                                        if t.Key == "type" {
+                                                if strings.ToLower(t.Val) == "hidden" {
+                                                        // Skip setting framesetOK = false
+                                                        return true
+                                                }
+                                        }
+                                }
+                        }
+                        p.framesetOK = false
+                case a.Param, a.Source, a.Track:
+                        p.addElement()
+                        p.oe.pop()
+                        p.acknowledgeSelfClosingTag()
+                case a.Hr:
+                        p.popUntil(buttonScope, a.P)
+                        p.addElement()
+                        p.oe.pop()
+                        p.acknowledgeSelfClosingTag()
+                        p.framesetOK = false
+                case a.Image:
+                        p.tok.DataAtom = a.Img
+                        p.tok.Data = a.Img.String()
+                        return false
+                case a.Isindex:
+                        if p.form != nil {
+                                // Ignore the token.
+                                return true
+                        }
+                        action := ""
+                        prompt := "This is a searchable index. Enter search keywords: "
+                        attr := []Attribute{{Key: "name", Val: "isindex"}}
+                        for _, t := range p.tok.Attr {
+                                switch t.Key {
+                                case "action":
+                                        action = t.Val
+                                case "name":
+                                        // Ignore the attribute.
+                                case "prompt":
+                                        prompt = t.Val
+                                default:
+                                        attr = append(attr, t)
+                                }
+                        }
+                        p.acknowledgeSelfClosingTag()
+                        p.popUntil(buttonScope, a.P)
+                        p.parseImpliedToken(StartTagToken, a.Form, a.Form.String())
+                        if action != "" {
+                                p.form.Attr = []Attribute{{Key: "action", Val: action}}
+                        }
+                        p.parseImpliedToken(StartTagToken, a.Hr, a.Hr.String())
+                        p.parseImpliedToken(StartTagToken, a.Label, a.Label.String())
+                        p.addText(prompt)
+                        p.addChild(&Node{
+                                Type:     ElementNode,
+                                DataAtom: a.Input,
+                                Data:     a.Input.String(),
+                                Attr:     attr,
+                        })
+                        p.oe.pop()
+                        p.parseImpliedToken(EndTagToken, a.Label, a.Label.String())
+                        p.parseImpliedToken(StartTagToken, a.Hr, a.Hr.String())
+                        p.parseImpliedToken(EndTagToken, a.Form, a.Form.String())
+                case a.Textarea:
+                        p.addElement()
+                        p.setOriginalIM()
+                        p.framesetOK = false
+                        p.im = textIM
+                case a.Xmp:
+                        p.popUntil(buttonScope, a.P)
+                        p.reconstructActiveFormattingElements()
+                        p.framesetOK = false
+                        p.addElement()
+                        p.setOriginalIM()
+                        p.im = textIM
+                case a.Iframe:
+                        p.framesetOK = false
+                        p.addElement()
+                        p.setOriginalIM()
+                        p.im = textIM
+                case a.Noembed, a.Noscript:
+                        p.addElement()
+                        p.setOriginalIM()
+                        p.im = textIM
+                case a.Select:
+                        p.reconstructActiveFormattingElements()
+                        p.addElement()
+                        p.framesetOK = false
+                        p.im = inSelectIM
+                        return true
+                case a.Optgroup, a.Option:
+                        if p.top().DataAtom == a.Option {
+                                p.oe.pop()
+                        }
+                        p.reconstructActiveFormattingElements()
+                        p.addElement()
+                case a.Rp, a.Rt:
+                        if p.elementInScope(defaultScope, a.Ruby) {
+                                p.generateImpliedEndTags()
+                        }
+                        p.addElement()
+                case a.Math, a.Svg:
+                        p.reconstructActiveFormattingElements()
+                        if p.tok.DataAtom == a.Math {
+                                adjustAttributeNames(p.tok.Attr, mathMLAttributeAdjustments)
+                        } else {
+                                adjustAttributeNames(p.tok.Attr, svgAttributeAdjustments)
+                        }
+                        adjustForeignAttributes(p.tok.Attr)
+                        p.addElement()
+                        p.top().Namespace = p.tok.Data
+                        if p.hasSelfClosingToken {
+                                p.oe.pop()
+                                p.acknowledgeSelfClosingTag()
+                        }
+                        return true
+                case a.Caption, a.Col, a.Colgroup, a.Frame, a.Head, a.Tbody, a.Td, a.Tfoot, a.Th, a.Thead, a.Tr:
+                        // Ignore the token.
+                default:
+                        p.reconstructActiveFormattingElements()
+                        p.addElement()
+                }
+        case EndTagToken:
+                switch p.tok.DataAtom {
+                case a.Body:
+                        if p.elementInScope(defaultScope, a.Body) {
+                                p.im = afterBodyIM
+                        }
+                case a.Html:
+                        if p.elementInScope(defaultScope, a.Body) {
+                                p.parseImpliedToken(EndTagToken, a.Body, a.Body.String())
+                                return false
+                        }
+                        return true
+                case a.Address, a.Article, a.Aside, a.Blockquote, a.Button, a.Center, a.Details, a.Dir, a.Div, a.Dl, a.Fieldset, a.Figcaption, a.Figure, a.Footer, a.Header, a.Hgroup, a.Listing, a.Menu, a.Nav, a.Ol, a.Pre, a.Section, a.Summary, a.Ul:
+                        p.popUntil(defaultScope, p.tok.DataAtom)
+                case a.Form:
+                        node := p.form
+                        p.form = nil
+                        i := p.indexOfElementInScope(defaultScope, a.Form)
+                        if node == nil || i == -1 || p.oe[i] != node {
+                                // Ignore the token.
+                                return true
+                        }
+                        p.generateImpliedEndTags()
+                        p.oe.remove(node)
+                case a.P:
+                        if !p.elementInScope(buttonScope, a.P) {
+                                p.parseImpliedToken(StartTagToken, a.P, a.P.String())
+                        }
+                        p.popUntil(buttonScope, a.P)
+                case a.Li:
+                        p.popUntil(listItemScope, a.Li)
+                case a.Dd, a.Dt:
+                        p.popUntil(defaultScope, p.tok.DataAtom)
+                case a.H1, a.H2, a.H3, a.H4, a.H5, a.H6:
+                        p.popUntil(defaultScope, a.H1, a.H2, a.H3, a.H4, a.H5, a.H6)
+                case a.A, a.B, a.Big, a.Code, a.Em, a.Font, a.I, a.Nobr, a.S, a.Small, a.Strike, a.Strong, a.Tt, a.U:
+                        p.inBodyEndTagFormatting(p.tok.DataAtom)
+                case a.Applet, a.Marquee, a.Object:
+                        if p.popUntil(defaultScope, p.tok.DataAtom) {
+                                p.clearActiveFormattingElements()
+                        }
+                case a.Br:
+                        p.tok.Type = StartTagToken
+                        return false
+                default:
+                        p.inBodyEndTagOther(p.tok.DataAtom)
+                }
+        case CommentToken:
+                p.addChild(&Node{
+                        Type: CommentNode,
+                        Data: p.tok.Data,
+                })
+        }
+
+        return true
+}
+
+func (p *parser) inBodyEndTagFormatting(tagAtom a.Atom) {
+        // This is the "adoption agency" algorithm, described at
+        // https://html.spec.whatwg.org/multipage/syntax.html#adoptionAgency
+
+        // TODO: this is a fairly literal line-by-line translation of that algorithm.
+        // Once the code successfully parses the comprehensive test suite, we should
+        // refactor this code to be more idiomatic.
+
+        // Steps 1-4. The outer loop.
+        for i := 0; i < 8; i++ {
+                // Step 5. Find the formatting element.
+                var formattingElement *Node
+                for j := len(p.afe) - 1; j >= 0; j-- {
+                        if p.afe[j].Type == scopeMarkerNode {
+                                break
+                        }
+                        if p.afe[j].DataAtom == tagAtom {
+                                formattingElement = p.afe[j]
+                                break
+                        }
+                }
+                if formattingElement == nil {
+                        p.inBodyEndTagOther(tagAtom)
+                        return
+                }
+                feIndex := p.oe.index(formattingElement)
+                if feIndex == -1 {
+                        p.afe.remove(formattingElement)
+                        return
+                }
+                if !p.elementInScope(defaultScope, tagAtom) {
+                        // Ignore the tag.
+                        return
+                }
+
+                // Steps 9-10. Find the furthest block.
+                var furthestBlock *Node
+                for _, e := range p.oe[feIndex:] {
+                        if isSpecialElement(e) {
+                                furthestBlock = e
+                                break
+                        }
+                }
+                if furthestBlock == nil {
+                        e := p.oe.pop()
+                        for e != formattingElement {
+                                e = p.oe.pop()
+                        }
+                        p.afe.remove(e)
+                        return
+                }
+
+                // Steps 11-12. Find the common ancestor and bookmark node.
+                commonAncestor := p.oe[feIndex-1]
+                bookmark := p.afe.index(formattingElement)
+
+                // Step 13. The inner loop. Find the lastNode to reparent.
+                lastNode := furthestBlock
+                node := furthestBlock
+                x := p.oe.index(node)
+                // Steps 13.1-13.2
+                for j := 0; j < 3; j++ {
+                        // Step 13.3.
+                        x--
+                        node = p.oe[x]
+                        // Step 13.4 - 13.5.
+                        if p.afe.index(node) == -1 {
+                                p.oe.remove(node)
+                                continue
+                        }
+                        // Step 13.6.
+                        if node == formattingElement {
+                                break
+                        }
+                        // Step 13.7.
+                        clone := node.clone()
+                        p.afe[p.afe.index(node)] = clone
+                        p.oe[p.oe.index(node)] = clone
+                        node = clone
+                        // Step 13.8.
+                        if lastNode == furthestBlock {
+                                bookmark = p.afe.index(node) + 1
+                        }
+                        // Step 13.9.
+                        if lastNode.Parent != nil {
+                                lastNode.Parent.RemoveChild(lastNode)
+                        }
+                        node.AppendChild(lastNode)
+                        // Step 13.10.
+                        lastNode = node
+                }
+
+                // Step 14. Reparent lastNode to the common ancestor,
+                // or for misnested table nodes, to the foster parent.
+                if lastNode.Parent != nil {
+                        lastNode.Parent.RemoveChild(lastNode)
+                }
+                switch commonAncestor.DataAtom {
+                case a.Table, a.Tbody, a.Tfoot, a.Thead, a.Tr:
+                        p.fosterParent(lastNode)
+                default:
+                        commonAncestor.AppendChild(lastNode)
+                }
+
+                // Steps 15-17. Reparent nodes from the furthest block's children
+                // to a clone of the formatting element.
+                clone := formattingElement.clone()
+                reparentChildren(clone, furthestBlock)
+                furthestBlock.AppendChild(clone)
+
+                // Step 18. Fix up the list of active formatting elements.
+                if oldLoc := p.afe.index(formattingElement); oldLoc != -1 && oldLoc < bookmark {
+                        // Move the bookmark with the rest of the list.
+                        bookmark--
+                }
+                p.afe.remove(formattingElement)
+                p.afe.insert(bookmark, clone)
+
+                // Step 19. Fix up the stack of open elements.
+                p.oe.remove(formattingElement)
+                p.oe.insert(p.oe.index(furthestBlock)+1, clone)
+        }
+}
+
+// inBodyEndTagOther performs the "any other end tag" algorithm for inBodyIM.
+// "Any other end tag" handling from 12.2.5.5 The rules for parsing tokens in foreign content
+// https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-inforeign
+func (p *parser) inBodyEndTagOther(tagAtom a.Atom) {
+        for i := len(p.oe) - 1; i >= 0; i-- {
+                if p.oe[i].DataAtom == tagAtom {
+                        p.oe = p.oe[:i]
+                        break
+                }
+                if isSpecialElement(p.oe[i]) {
+                        break
+                }
+        }
+}
+
+// Section 12.2.5.4.8.
+func textIM(p *parser) bool {
+        switch p.tok.Type {
+        case ErrorToken:
+                p.oe.pop()
+        case TextToken:
+                d := p.tok.Data
+                if n := p.oe.top(); n.DataAtom == a.Textarea && n.FirstChild == nil {
+                        // Ignore a newline at the start of a <textarea> block.
+                        if d != "" && d[0] == '\r' {
+                                d = d[1:]
+                        }
+                        if d != "" && d[0] == '\n' {
+                                d = d[1:]
+                        }
+                }
+                if d == "" {
+                        return true
+                }
+                p.addText(d)
+                return true
+        case EndTagToken:
+                p.oe.pop()
+        }
+        p.im = p.originalIM
+        p.originalIM = nil
+        return p.tok.Type == EndTagToken
+}
+
+// Section 12.2.5.4.9.
+func inTableIM(p *parser) bool {
+        switch p.tok.Type {
+        case ErrorToken:
+                // Stop parsing.
+                return true
+        case TextToken:
+                p.tok.Data = strings.Replace(p.tok.Data, "\x00", "", -1)
+                switch p.oe.top().DataAtom {
+                case a.Table, a.Tbody, a.Tfoot, a.Thead, a.Tr:
+                        if strings.Trim(p.tok.Data, whitespace) == "" {
+                                p.addText(p.tok.Data)
+                                return true
+                        }
+                }
+        case StartTagToken:
+                switch p.tok.DataAtom {
+                case a.Caption:
+                        p.clearStackToContext(tableScope)
+                        p.afe = append(p.afe, &scopeMarker)
+                        p.addElement()
+                        p.im = inCaptionIM
+                        return true
+                case a.Colgroup:
+                        p.clearStackToContext(tableScope)
+                        p.addElement()
+                        p.im = inColumnGroupIM
+                        return true
+                case a.Col:
+                        p.parseImpliedToken(StartTagToken, a.Colgroup, a.Colgroup.String())
+                        return false
+                case a.Tbody, a.Tfoot, a.Thead:
+                        p.clearStackToContext(tableScope)
+                        p.addElement()
+                        p.im = inTableBodyIM
+                        return true
+                case a.Td, a.Th, a.Tr:
+                        p.parseImpliedToken(StartTagToken, a.Tbody, a.Tbody.String())
+                        return false
+                case a.Table:
+                        if p.popUntil(tableScope, a.Table) {
+                                p.resetInsertionMode()
+                                return false
+                        }
+                        // Ignore the token.
+                        return true
+                case a.Style, a.Script:
+                        return inHeadIM(p)
+                case a.Input:
+                        for _, t := range p.tok.Attr {
+                                if t.Key == "type" && strings.ToLower(t.Val) == "hidden" {
+                                        p.addElement()
+                                        p.oe.pop()
+                                        return true
+                                }
+                        }
+                        // Otherwise drop down to the default action.
+                case a.Form:
+                        if p.form != nil {
+                                // Ignore the token.
+                                return true
+                        }
+                        p.addElement()
+                        p.form = p.oe.pop()
+                case a.Select:
+                        p.reconstructActiveFormattingElements()
+                        switch p.top().DataAtom {
+                        case a.Table, a.Tbody, a.Tfoot, a.Thead, a.Tr:
+                                p.fosterParenting = true
+                        }
+                        p.addElement()
+                        p.fosterParenting = false
+                        p.framesetOK = false
+                        p.im = inSelectInTableIM
+                        return true
+                }
+        case EndTagToken:
+                switch p.tok.DataAtom {
+                case a.Table:
+                        if p.popUntil(tableScope, a.Table) {
+                                p.resetInsertionMode()
+                                return true
+                        }
+                        // Ignore the token.
+                        return true
+                case a.Body, a.Caption, a.Col, a.Colgroup, a.Html, a.Tbody, a.Td, a.Tfoot, a.Th, a.Thead, a.Tr:
+                        // Ignore the token.
+                        return true
+                }
+        case CommentToken:
+                p.addChild(&Node{
+                        Type: CommentNode,
+                        Data: p.tok.Data,
+                })
+                return true
+        case DoctypeToken:
+                // Ignore the token.
+                return true
+        }
+
+        p.fosterParenting = true
+        defer func() { p.fosterParenting = false }()
+
+        return inBodyIM(p)
+}
+
+// Section 12.2.5.4.11.
+func inCaptionIM(p *parser) bool {
+        switch p.tok.Type {
+        case StartTagToken:
+                switch p.tok.DataAtom {
+                case a.Caption, a.Col, a.Colgroup, a.Tbody, a.Td, a.Tfoot, a.Thead, a.Tr:
+                        if p.popUntil(tableScope, a.Caption) {
+                                p.clearActiveFormattingElements()
+                                p.im = inTableIM
+                                return false
+                        } else {
+                                // Ignore the token.
+                                return true
+                        }
+                case a.Select:
+                        p.reconstructActiveFormattingElements()
+                        p.addElement()
+                        p.framesetOK = false
+                        p.im = inSelectInTableIM
+                        return true
+                }
+        case EndTagToken:
+                switch p.tok.DataAtom {
+                case a.Caption:
+                        if p.popUntil(tableScope, a.Caption) {
+                                p.clearActiveFormattingElements()
+                                p.im = inTableIM
+                        }
+                        return true
+                case a.Table:
+                        if p.popUntil(tableScope, a.Caption) {
+                                p.clearActiveFormattingElements()
+                                p.im = inTableIM
+                                return false
+                        } else {
+                                // Ignore the token.
+                                return true
+                        }
+                case a.Body, a.Col, a.Colgroup, a.Html, a.Tbody, a.Td, a.Tfoot, a.Th, a.Thead, a.Tr:
+                        // Ignore the token.
+                        return true
+                }
+        }
+        return inBodyIM(p)
+}
+
+// Section 12.2.5.4.12.
+func inColumnGroupIM(p *parser) bool {
+        switch p.tok.Type {
+        case TextToken:
+                s := strings.TrimLeft(p.tok.Data, whitespace)
+                if len(s) < len(p.tok.Data) {
+                        // Add the initial whitespace to the current node.
+                        p.addText(p.tok.Data[:len(p.tok.Data)-len(s)])
+                        if s == "" {
+                                return true
+                        }
+                        p.tok.Data = s
+                }
+        case CommentToken:
+                p.addChild(&Node{
+                        Type: CommentNode,
+                        Data: p.tok.Data,
+                })
+                return true
+        case DoctypeToken:
+                // Ignore the token.
+                return true
+        case StartTagToken:
+                switch p.tok.DataAtom {
+                case a.Html:
+                        return inBodyIM(p)
+                case a.Col:
+                        p.addElement()
+                        p.oe.pop()
+                        p.acknowledgeSelfClosingTag()
+                        return true
+                }
+        case EndTagToken:
+                switch p.tok.DataAtom {
+                case a.Colgroup:
+                        if p.oe.top().DataAtom != a.Html {
+                                p.oe.pop()
+                                p.im = inTableIM
+                        }
+                        return true
+                case a.Col:
+                        // Ignore the token.
+                        return true
+                }
+        }
+        if p.oe.top().DataAtom != a.Html {
+                p.oe.pop()
+                p.im = inTableIM
+                return false
+        }
+        return true
+}
+
+// Section 12.2.5.4.13.
+func inTableBodyIM(p *parser) bool {
+        switch p.tok.Type {
+        case StartTagToken:
+                switch p.tok.DataAtom {
+                case a.Tr:
+                        p.clearStackToContext(tableBodyScope)
+                        p.addElement()
+                        p.im = inRowIM
+                        return true
+                case a.Td, a.Th:
+                        p.parseImpliedToken(StartTagToken, a.Tr, a.Tr.String())
+                        return false
+                case a.Caption, a.Col, a.Colgroup, a.Tbody, a.Tfoot, a.Thead:
+                        if p.popUntil(tableScope, a.Tbody, a.Thead, a.Tfoot) {
+                                p.im = inTableIM
+                                return false
+                        }
+                        // Ignore the token.
+                        return true
+                }
+        case EndTagToken:
+                switch p.tok.DataAtom {
+                case a.Tbody, a.Tfoot, a.Thead:
+                        if p.elementInScope(tableScope, p.tok.DataAtom) {
+                                p.clearStackToContext(tableBodyScope)
+                                p.oe.pop()
+                                p.im = inTableIM
+                        }
+                        return true
+                case a.Table:
+                        if p.popUntil(tableScope, a.Tbody, a.Thead, a.Tfoot) {
+                                p.im = inTableIM
+                                return false
+                        }
+                        // Ignore the token.
+                        return true
+                case a.Body, a.Caption, a.Col, a.Colgroup, a.Html, a.Td, a.Th, a.Tr:
+                        // Ignore the token.
+                        return true
+                }
+        case CommentToken:
+                p.addChild(&Node{
+                        Type: CommentNode,
+                        Data: p.tok.Data,
+                })
+                return true
+        }
+
+        return inTableIM(p)
+}
+
+// Section 12.2.5.4.14.
+func inRowIM(p *parser) bool {
+        switch p.tok.Type {
+        case StartTagToken:
+                switch p.tok.DataAtom {
+                case a.Td, a.Th:
+                        p.clearStackToContext(tableRowScope)
+                        p.addElement()
+                        p.afe = append(p.afe, &scopeMarker)
+                        p.im = inCellIM
+                        return true
+                case a.Caption, a.Col, a.Colgroup, a.Tbody, a.Tfoot, a.Thead, a.Tr:
+                        if p.popUntil(tableScope, a.Tr) {
+                                p.im = inTableBodyIM
+                                return false
+                        }
+                        // Ignore the token.
+                        return true
+                }
+        case EndTagToken:
+                switch p.tok.DataAtom {
+                case a.Tr:
+                        if p.popUntil(tableScope, a.Tr) {
+                                p.im = inTableBodyIM
+                                return true
+                        }
+                        // Ignore the token.
+                        return true
+                case a.Table:
+                        if p.popUntil(tableScope, a.Tr) {
+                                p.im = inTableBodyIM
+                                return false
+                        }
+                        // Ignore the token.
+                        return true
+                case a.Tbody, a.Tfoot, a.Thead:
+                        if p.elementInScope(tableScope, p.tok.DataAtom) {
+                                p.parseImpliedToken(EndTagToken, a.Tr, a.Tr.String())
+                                return false
+                        }
+                        // Ignore the token.
+                        return true
+                case a.Body, a.Caption, a.Col, a.Colgroup, a.Html, a.Td, a.Th:
+                        // Ignore the token.
+                        return true
+                }
+        }
+
+        return inTableIM(p)
+}
+
+// Section 12.2.5.4.15.
+func inCellIM(p *parser) bool {
+        switch p.tok.Type {
+        case StartTagToken:
+                switch p.tok.DataAtom {
+                case a.Caption, a.Col, a.Colgroup, a.Tbody, a.Td, a.Tfoot, a.Th, a.Thead, a.Tr:
+                        if p.popUntil(tableScope, a.Td, a.Th) {
+                                // Close the cell and reprocess.
+                                p.clearActiveFormattingElements()
+                                p.im = inRowIM
+                                return false
+                        }
+                        // Ignore the token.
+                        return true
+                case a.Select:
+                        p.reconstructActiveFormattingElements()
+                        p.addElement()
+                        p.framesetOK = false
+                        p.im = inSelectInTableIM
+                        return true
+                }
+        case EndTagToken:
+                switch p.tok.DataAtom {
+                case a.Td, a.Th:
+                        if !p.popUntil(tableScope, p.tok.DataAtom) {
+                                // Ignore the token.
+                                return true
+                        }
+                        p.clearActiveFormattingElements()
+                        p.im = inRowIM
+                        return true
+                case a.Body, a.Caption, a.Col, a.Colgroup, a.Html:
+                        // Ignore the token.
+                        return true
+                case a.Table, a.Tbody, a.Tfoot, a.Thead, a.Tr:
+                        if !p.elementInScope(tableScope, p.tok.DataAtom) {
+                                // Ignore the token.
+                                return true
+                        }
+                        // Close the cell and reprocess.
+                        p.popUntil(tableScope, a.Td, a.Th)
+                        p.clearActiveFormattingElements()
+                        p.im = inRowIM
+                        return false
+                }
+        }
+        return inBodyIM(p)
+}
+
+// Section 12.2.5.4.16.
+func inSelectIM(p *parser) bool {
+        switch p.tok.Type {
+        case ErrorToken:
+                // Stop parsing.
+                return true
+        case TextToken:
+                p.addText(strings.Replace(p.tok.Data, "\x00", "", -1))
+        case StartTagToken:
+                switch p.tok.DataAtom {
+                case a.Html:
+                        return inBodyIM(p)
+                case a.Option:
+                        if p.top().DataAtom == a.Option {
+                                p.oe.pop()
+                        }
+                        p.addElement()
+                case a.Optgroup:
+                        if p.top().DataAtom == a.Option {
+                                p.oe.pop()
+                        }
+                        if p.top().DataAtom == a.Optgroup {
+                                p.oe.pop()
+                        }
+                        p.addElement()
+                case a.Select:
+                        p.tok.Type = EndTagToken
+                        return false
+                case a.Input, a.Keygen, a.Textarea:
+                        if p.elementInScope(selectScope, a.Select) {
+                                p.parseImpliedToken(EndTagToken, a.Select, a.Select.String())
+                                return false
+                        }
+                        // In order to properly ignore <textarea>, we need to change the tokenizer mode.
+                        p.tokenizer.NextIsNotRawText()
+                        // Ignore the token.
+                        return true
+                case a.Script:
+                        return inHeadIM(p)
+                }
+        case EndTagToken:
+                switch p.tok.DataAtom {
+                case a.Option:
+                        if p.top().DataAtom == a.Option {
+                                p.oe.pop()
+                        }
+                case a.Optgroup:
+                        i := len(p.oe) - 1
+                        if p.oe[i].DataAtom == a.Option {
+                                i--
+                        }
+                        if p.oe[i].DataAtom == a.Optgroup {
+                                p.oe = p.oe[:i]
+                        }
+                case a.Select:
+                        if p.popUntil(selectScope, a.Select) {
+                                p.resetInsertionMode()
+                        }
+                }
+        case CommentToken:
+                p.addChild(&Node{
+                        Type: CommentNode,
+                        Data: p.tok.Data,
+                })
+        case DoctypeToken:
+                // Ignore the token.
+                return true
+        }
+
+        return true
+}
+
+// Section 12.2.5.4.17.
+func inSelectInTableIM(p *parser) bool {
+        switch p.tok.Type {
+        case StartTagToken, EndTagToken:
+                switch p.tok.DataAtom {
+                case a.Caption, a.Table, a.Tbody, a.Tfoot, a.Thead, a.Tr, a.Td, a.Th:
+                        if p.tok.Type == StartTagToken || p.elementInScope(tableScope, p.tok.DataAtom) {
+                                p.parseImpliedToken(EndTagToken, a.Select, a.Select.String())
+                                return false
+                        } else {
+                                // Ignore the token.
+                                return true
+                        }
+                }
+        }
+        return inSelectIM(p)
+}
+
+// Section 12.2.5.4.18.
+func afterBodyIM(p *parser) bool {
+        switch p.tok.Type {
+        case ErrorToken:
+                // Stop parsing.
+                return true
+        case TextToken:
+                s := strings.TrimLeft(p.tok.Data, whitespace)
+                if len(s) == 0 {
+                        // It was all whitespace.
+                        return inBodyIM(p)
+                }
+        case StartTagToken:
+                if p.tok.DataAtom == a.Html {
+                        return inBodyIM(p)
+                }
+        case EndTagToken:
+                if p.tok.DataAtom == a.Html {
+                        if !p.fragment {
+                                p.im = afterAfterBodyIM
+                        }
+                        return true
+                }
+        case CommentToken:
+                // The comment is attached to the <html> element.
+                if len(p.oe) < 1 || p.oe[0].DataAtom != a.Html {
+                        panic("html: bad parser state: <html> element not found, in the after-body insertion mode")
+                }
+                p.oe[0].AppendChild(&Node{
+                        Type: CommentNode,
+                        Data: p.tok.Data,
+                })
+                return true
+        }
+        p.im = inBodyIM
+        return false
+}
+
+// Section 12.2.5.4.19.
+func inFramesetIM(p *parser) bool {
+        switch p.tok.Type {
+        case CommentToken:
+                p.addChild(&Node{
+                        Type: CommentNode,
+                        Data: p.tok.Data,
+                })
+        case TextToken:
+                // Ignore all text but whitespace.
+                s := strings.Map(func(c rune) rune {
+                        switch c {
+                        case ' ', '\t', '\n', '\f', '\r':
+                                return c
+                        }
+                        return -1
+                }, p.tok.Data)
+                if s != "" {
+                        p.addText(s)
+                }
+        case StartTagToken:
+                switch p.tok.DataAtom {
+                case a.Html:
+                        return inBodyIM(p)
+                case a.Frameset:
+                        p.addElement()
+                case a.Frame:
+                        p.addElement()
+                        p.oe.pop()
+                        p.acknowledgeSelfClosingTag()
+                case a.Noframes:
+                        return inHeadIM(p)
+                }
+        case EndTagToken:
+                switch p.tok.DataAtom {
+                case a.Frameset:
+                        if p.oe.top().DataAtom != a.Html {
+                                p.oe.pop()
+                                if p.oe.top().DataAtom != a.Frameset {
+                                        p.im = afterFramesetIM
+                                        return true
+                                }
+                        }
+                }
+        default:
+                // Ignore the token.
+        }
+        return true
+}
+
+// Section 12.2.5.4.20.
+func afterFramesetIM(p *parser) bool {
+        switch p.tok.Type {
+        case CommentToken:
+                p.addChild(&Node{
+                        Type: CommentNode,
+                        Data: p.tok.Data,
+                })
+        case TextToken:
+                // Ignore all text but whitespace.
+                s := strings.Map(func(c rune) rune {
+                        switch c {
+                        case ' ', '\t', '\n', '\f', '\r':
+                                return c
+                        }
+                        return -1
+                }, p.tok.Data)
+                if s != "" {
+                        p.addText(s)
+                }
+        case StartTagToken:
+                switch p.tok.DataAtom {
+                case a.Html:
+                        return inBodyIM(p)
+                case a.Noframes:
+                        return inHeadIM(p)
+                }
+        case EndTagToken:
+                switch p.tok.DataAtom {
+                case a.Html:
+                        p.im = afterAfterFramesetIM
+                        return true
+                }
+        default:
+                // Ignore the token.
+        }
+        return true
+}
+
+// Section 12.2.5.4.21.
+func afterAfterBodyIM(p *parser) bool {
+        switch p.tok.Type {
+        case ErrorToken:
+                // Stop parsing.
+                return true
+        case TextToken:
+                s := strings.TrimLeft(p.tok.Data, whitespace)
+                if len(s) == 0 {
+                        // It was all whitespace.
+                        return inBodyIM(p)
+                }
+        case StartTagToken:
+                if p.tok.DataAtom == a.Html {
+                        return inBodyIM(p)
+                }
+        case CommentToken:
+                p.doc.AppendChild(&Node{
+                        Type: CommentNode,
+                        Data: p.tok.Data,
+                })
+                return true
+        case DoctypeToken:
+                return inBodyIM(p)
+        }
+        p.im = inBodyIM
+        return false
+}
+
+// Section 12.2.5.4.22.
+func afterAfterFramesetIM(p *parser) bool {
+        switch p.tok.Type {
+        case CommentToken:
+                p.doc.AppendChild(&Node{
+                        Type: CommentNode,
+                        Data: p.tok.Data,
+                })
+        case TextToken:
+                // Ignore all text but whitespace.
+                s := strings.Map(func(c rune) rune {
+                        switch c {
+                        case ' ', '\t', '\n', '\f', '\r':
+                                return c
+                        }
+                        return -1
+                }, p.tok.Data)
+                if s != "" {
+                        p.tok.Data = s
+                        return inBodyIM(p)
+                }
+        case StartTagToken:
+                switch p.tok.DataAtom {
+                case a.Html:
+                        return inBodyIM(p)
+                case a.Noframes:
+                        return inHeadIM(p)
+                }
+        case DoctypeToken:
+                return inBodyIM(p)
+        default:
+                // Ignore the token.
+        }
+        return true
+}
+
+const whitespaceOrNUL = whitespace + "\x00"
+
+// Section 12.2.5.5.
+func parseForeignContent(p *parser) bool {
+        switch p.tok.Type {
+        case TextToken:
+                if p.framesetOK {
+                        p.framesetOK = strings.TrimLeft(p.tok.Data, whitespaceOrNUL) == ""
+                }
+                p.tok.Data = strings.Replace(p.tok.Data, "\x00", "\ufffd", -1)
+                p.addText(p.tok.Data)
+        case CommentToken:
+                p.addChild(&Node{
+                        Type: CommentNode,
+                        Data: p.tok.Data,
+                })
+        case StartTagToken:
+                b := breakout[p.tok.Data]
+                if p.tok.DataAtom == a.Font {
+                loop:
+                        for _, attr := range p.tok.Attr {
+                                switch attr.Key {
+                                case "color", "face", "size":
+                                        b = true
+                                        break loop
+                                }
+                        }
+                }
+                if b {
+                        for i := len(p.oe) - 1; i >= 0; i-- {
+                                n := p.oe[i]
+                                if n.Namespace == "" || htmlIntegrationPoint(n) || mathMLTextIntegrationPoint(n) {
+                                        p.oe = p.oe[:i+1]
+                                        break
+                                }
+                        }
+                        return false
+                }
+                switch p.top().Namespace {
+                case "math":
+                        adjustAttributeNames(p.tok.Attr, mathMLAttributeAdjustments)
+                case "svg":
+                        // Adjust SVG tag names. The tokenizer lower-cases tag names, but
+                        // SVG wants e.g. "foreignObject" with a capital second "O".
+                        if x := svgTagNameAdjustments[p.tok.Data]; x != "" {
+                                p.tok.DataAtom = a.Lookup([]byte(x))
+                                p.tok.Data = x
+                        }
+                        adjustAttributeNames(p.tok.Attr, svgAttributeAdjustments)
+                default:
+                        panic("html: bad parser state: unexpected namespace")
+                }
+                adjustForeignAttributes(p.tok.Attr)
+                namespace := p.top().Namespace
+                p.addElement()
+                p.top().Namespace = namespace
+                if namespace != "" {
+                        // Don't let the tokenizer go into raw text mode in foreign content
+                        // (e.g. in an SVG <title> tag).
+                        p.tokenizer.NextIsNotRawText()
+                }
+                if p.hasSelfClosingToken {
+                        p.oe.pop()
+                        p.acknowledgeSelfClosingTag()
+                }
+        case EndTagToken:
+                for i := len(p.oe) - 1; i >= 0; i-- {
+                        if p.oe[i].Namespace == "" {
+                                return p.im(p)
+                        }
+                        if strings.EqualFold(p.oe[i].Data, p.tok.Data) {
+                                p.oe = p.oe[:i]
+                                break
+                        }
+                }
+                return true
+        default:
+                // Ignore the token.
+        }
+        return true
+}
+
+// Section 12.2.5.
+func (p *parser) inForeignContent() bool {
+        if len(p.oe) == 0 {
+                return false
+        }
+        n := p.oe[len(p.oe)-1]
+        if n.Namespace == "" {
+                return false
+        }
+        if mathMLTextIntegrationPoint(n) {
+                if p.tok.Type == StartTagToken && p.tok.DataAtom != a.Mglyph && p.tok.DataAtom != a.Malignmark {
+                        return false
+                }
+                if p.tok.Type == TextToken {
+                        return false
+                }
+        }
+        if n.Namespace == "math" && n.DataAtom == a.AnnotationXml && p.tok.Type == StartTagToken && p.tok.DataAtom == a.Svg {
+                return false
+        }
+        if htmlIntegrationPoint(n) && (p.tok.Type == StartTagToken || p.tok.Type == TextToken) {
+                return false
+        }
+        if p.tok.Type == ErrorToken {
+                return false
+        }
+        return true
+}
+
+// parseImpliedToken parses a token as though it had appeared in the parser's
+// input.
+func (p *parser) parseImpliedToken(t TokenType, dataAtom a.Atom, data string) {
+        realToken, selfClosing := p.tok, p.hasSelfClosingToken
+        p.tok = Token{
+                Type:     t,
+                DataAtom: dataAtom,
+                Data:     data,
+        }
+        p.hasSelfClosingToken = false
+        p.parseCurrentToken()
+        p.tok, p.hasSelfClosingToken = realToken, selfClosing
+}
+
+// parseCurrentToken runs the current token through the parsing routines
+// until it is consumed.
+func (p *parser) parseCurrentToken() {
+        if p.tok.Type == SelfClosingTagToken {
+                p.hasSelfClosingToken = true
+                p.tok.Type = StartTagToken
+        }
+
+        consumed := false
+        for !consumed {
+                if p.inForeignContent() {
+                        consumed = parseForeignContent(p)
+                } else {
+                        consumed = p.im(p)
+                }
+        }
+
+        if p.hasSelfClosingToken {
+                // This is a parse error, but ignore it.
+                p.hasSelfClosingToken = false
+        }
+}
+
+func (p *parser) parse() error {
+        // Iterate until EOF. Any other error will cause an early return.
+        var err error
+        for err != io.EOF {
+                // CDATA sections are allowed only in foreign content.
+                n := p.oe.top()
+                p.tokenizer.AllowCDATA(n != nil && n.Namespace != "")
+                // Read and parse the next token.
+                p.tokenizer.Next()
+                p.tok = p.tokenizer.Token()
+                if p.tok.Type == ErrorToken {
+                        err = p.tokenizer.Err()
+                        if err != nil && err != io.EOF {
+                                return err
+                        }
+                }
+                p.parseCurrentToken()
+        }
+        return nil
+}
+
+// Parse returns the parse tree for the HTML from the given Reader.
+// The input is assumed to be UTF-8 encoded.
+func Parse(r io.Reader) (*Node, error) {
+        p := &parser{
+                tokenizer: NewTokenizer(r),
+                doc: &Node{
+                        Type: DocumentNode,
+                },
+                scripting:  true,
+                framesetOK: true,
+                im:         initialIM,
+        }
+        err := p.parse()
+        if err != nil {
+                return nil, err
+        }
+        return p.doc, nil
+}
+
+// ParseFragment parses a fragment of HTML and returns the nodes that were
+// found. If the fragment is the InnerHTML for an existing element, pass that
+// element in context.
+func ParseFragment(r io.Reader, context *Node) ([]*Node, error) {
+        contextTag := ""
+        if context != nil {
+                if context.Type != ElementNode {
+                        return nil, errors.New("html: ParseFragment of non-element Node")
+                }
+                // The next check isn't just context.DataAtom.String() == context.Data because
+                // it is valid to pass an element whose tag isn't a known atom. For example,
+                // DataAtom == 0 and Data = "tagfromthefuture" is perfectly consistent.
+                if context.DataAtom != a.Lookup([]byte(context.Data)) {
+                        return nil, fmt.Errorf("html: inconsistent Node: DataAtom=%q, Data=%q", context.DataAtom, context.Data)
+                }
+                contextTag = context.DataAtom.String()
+        }
+        p := &parser{
+                tokenizer: NewTokenizerFragment(r, contextTag),
+                doc: &Node{
+                        Type: DocumentNode,
+                },
+                scripting: true,
+                fragment:  true,
+                context:   context,
+        }
+
+        root := &Node{
+                Type:     ElementNode,
+                DataAtom: a.Html,
+                Data:     a.Html.String(),
+        }
+        p.doc.AppendChild(root)
+        p.oe = nodeStack{root}
+        p.resetInsertionMode()
+
+        for n := context; n != nil; n = n.Parent {
+                if n.Type == ElementNode && n.DataAtom == a.Form {
+                        p.form = n
+                        break
+                }
+        }
+
+        err := p.parse()
+        if err != nil {
+                return nil, err
+        }
+
+        parent := p.doc
+        if context != nil {
+                parent = root
+        }
+
+        var result []*Node
+        for c := parent.FirstChild; c != nil; {
+                next := c.NextSibling
+                parent.RemoveChild(c)
+                result = append(result, c)
+                c = next
+        }
+        return result, nil
+}
diff --git a/vendor/golang.org/x/net/html/render.go b/vendor/golang.org/x/net/html/render.go
new file mode 100644
index 0000000..d34564f
--- /dev/null
+++ b/vendor/golang.org/x/net/html/render.go
@@ -0,0 +1,271 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package html
+
+import (
+        "bufio"
+        "errors"
+        "fmt"
+        "io"
+        "strings"
+)
+
+type writer interface {
+        io.Writer
+        io.ByteWriter
+        WriteString(string) (int, error)
+}
+
+// Render renders the parse tree n to the given writer.
+//
+// Rendering is done on a 'best effort' basis: calling Parse on the output of
+// Render will always result in something similar to the original tree, but it
+// is not necessarily an exact clone unless the original tree was 'well-formed'.
+// 'Well-formed' is not easily specified; the HTML5 specification is
+// complicated.
+//
+// Calling Parse on arbitrary input typically results in a 'well-formed' parse
+// tree. However, it is possible for Parse to yield a 'badly-formed' parse tree.
+// For example, in a 'well-formed' parse tree, no <a> element is a child of
+// another <a> element: parsing "<a><a>" results in two sibling elements.
+// Similarly, in a 'well-formed' parse tree, no <a> element is a child of a
+// <table> element: parsing "<p><table><a>" results in a <p> with two sibling
+// children; the <a> is reparented to the <table>'s parent. However, calling
+// Parse on "<a><table><a>" does not return an error, but the result has an <a>
+// element with an <a> child, and is therefore not 'well-formed'.
+//
+// Programmatically constructed trees are typically also 'well-formed', but it
+// is possible to construct a tree that looks innocuous but, when rendered and
+// re-parsed, results in a different tree. A simple example is that a solitary
+// text node would become a tree containing <html>, <head> and <body> elements.
+// Another example is that the programmatic equivalent of "a<head>b</head>c"
+// becomes "<html><head><head/><body>abc</body></html>".
+func Render(w io.Writer, n *Node) error {
+        if x, ok := w.(writer); ok {
+                return render(x, n)
+        }
+        buf := bufio.NewWriter(w)
+        if err := render(buf, n); err != nil {
+                return err
+        }
+        return buf.Flush()
+}
+
+// plaintextAbort is returned from render1 when a <plaintext> element
+// has been rendered. No more end tags should be rendered after that.
+var plaintextAbort = errors.New("html: internal error (plaintext abort)")
+
+func render(w writer, n *Node) error {
+        err := render1(w, n)
+        if err == plaintextAbort {
+                err = nil
+        }
+        return err
+}
+
+func render1(w writer, n *Node) error {
+        // Render non-element nodes; these are the easy cases.
+        switch n.Type {
+        case ErrorNode:
+                return errors.New("html: cannot render an ErrorNode node")
+        case TextNode:
+                return escape(w, n.Data)
+        case DocumentNode:
+                for c := n.FirstChild; c != nil; c = c.NextSibling {
+                        if err := render1(w, c); err != nil {
+                                return err
+                        }
+                }
+                return nil
+        case ElementNode:
+                // No-op.
+        case CommentNode:
+                if _, err := w.WriteString("<!--"); err != nil {
+                        return err
+                }
+                if _, err := w.WriteString(n.Data); err != nil {
+                        return err
+                }
+                if _, err := w.WriteString("-->"); err != nil {
+                        return err
+                }
+                return nil
+        case DoctypeNode:
+                if _, err := w.WriteString("<!DOCTYPE "); err != nil {
+                        return err
+                }
+                if _, err := w.WriteString(n.Data); err != nil {
+                        return err
+                }
+                if n.Attr != nil {
+                        var p, s string
+                        for _, a := range n.Attr {
+                                switch a.Key {
+                                case "public":
+                                        p = a.Val
+                                case "system":
+                                        s = a.Val
+                                }
+                        }
+                        if p != "" {
+                                if _, err := w.WriteString(" PUBLIC "); err != nil {
+                                        return err
+                                }
+                                if err := writeQuoted(w, p); err != nil {
+                                        return err
+                                }
+                                if s != "" {
+                                        if err := w.WriteByte(' '); err != nil {
+                                                return err
+                                        }
+                                        if err := writeQuoted(w, s); err != nil {
+                                                return err
+                                        }
+                                }
+                        } else if s != "" {
+                                if _, err := w.WriteString(" SYSTEM "); err != nil {
+                                        return err
+                                }
+                                if err := writeQuoted(w, s); err != nil {
+                                        return err
+                                }
+                        }
+                }
+                return w.WriteByte('>')
+        default:
+                return errors.New("html: unknown node type")
+        }
+
+        // Render the <xxx> opening tag.
+        if err := w.WriteByte('<'); err != nil {
+                return err
+        }
+        if _, err := w.WriteString(n.Data); err != nil {
+                return err
+        }
+        for _, a := range n.Attr {
+                if err := w.WriteByte(' '); err != nil {
+                        return err
+                }
+                if a.Namespace != "" {
+                        if _, err := w.WriteString(a.Namespace); err != nil {
+                                return err
+                        }
+                        if err := w.WriteByte(':'); err != nil {
+                                return err
+                        }
+                }
+                if _, err := w.WriteString(a.Key); err != nil {
+                        return err
+                }
+                if _, err := w.WriteString(`="`); err != nil {
+                        return err
+                }
+                if err := escape(w, a.Val); err != nil {
+                        return err
+                }
+                if err := w.WriteByte('"'); err != nil {
+                        return err
+                }
+        }
+        if voidElements[n.Data] {
+                if n.FirstChild != nil {
+                        return fmt.Errorf("html: void element <%s> has child nodes", n.Data)
+                }
+                _, err := w.WriteString("/>")
+                return err
+        }
+        if err := w.WriteByte('>'); err != nil {
+                return err
+        }
+
+        // Add initial newline where there is danger of a newline beging ignored.
+        if c := n.FirstChild; c != nil && c.Type == TextNode && strings.HasPrefix(c.Data, "\n") {
+                switch n.Data {
+                case "pre", "listing", "textarea":
+                        if err := w.WriteByte('\n'); err != nil {
+                                return err
+                        }
+                }
+        }
+
+        // Render any child nodes.
+        switch n.Data {
+        case "iframe", "noembed", "noframes", "noscript", "plaintext", "script", "style", "xmp":
+                for c := n.FirstChild; c != nil; c = c.NextSibling {
+                        if c.Type == TextNode {
+                                if _, err := w.WriteString(c.Data); err != nil {
+                                        return err
+                                }
+                        } else {
+                                if err := render1(w, c); err != nil {
+                                        return err
+                                }
+                        }
+                }
+                if n.Data == "plaintext" {
+                        // Don't render anything else. <plaintext> must be the
+                        // last element in the file, with no closing tag.
+                        return plaintextAbort
+                }
+        default:
+                for c := n.FirstChild; c != nil; c = c.NextSibling {
+                        if err := render1(w, c); err != nil {
+                                return err
+                        }
+                }
+        }
+
+        // Render the </xxx> closing tag.
+        if _, err := w.WriteString("</"); err != nil {
+                return err
+        }
+        if _, err := w.WriteString(n.Data); err != nil {
+                return err
+        }
+        return w.WriteByte('>')
+}
+
+// writeQuoted writes s to w surrounded by quotes. Normally it will use double
+// quotes, but if s contains a double quote, it will use single quotes.
+// It is used for writing the identifiers in a doctype declaration.
+// In valid HTML, they can't contain both types of quotes.
+func writeQuoted(w writer, s string) error {
+        var q byte = '"'
+        if strings.Contains(s, `"`) {
+                q = '\''
+        }
+        if err := w.WriteByte(q); err != nil {
+                return err
+        }
+        if _, err := w.WriteString(s); err != nil {
+                return err
+        }
+        if err := w.WriteByte(q); err != nil {
+                return err
+        }
+        return nil
+}
+
+// Section 12.1.2, "Elements", gives this list of void elements. Void elements
+// are those that can't have any contents.
+var voidElements = map[string]bool{
+        "area":    true,
+        "base":    true,
+        "br":      true,
+        "col":     true,
+        "command": true,
+        "embed":   true,
+        "hr":      true,
+        "img":     true,
+        "input":   true,
+        "keygen":  true,
+        "link":    true,
+        "meta":    true,
+        "param":   true,
+        "source":  true,
+        "track":   true,
+        "wbr":     true,
+}
diff --git a/vendor/golang.org/x/net/html/token.go b/vendor/golang.org/x/net/html/token.go
new file mode 100644
index 0000000..893e272
--- /dev/null
+++ b/vendor/golang.org/x/net/html/token.go
@@ -0,0 +1,1219 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package html
+
+import (
+        "bytes"
+        "errors"
+        "io"
+        "strconv"
+        "strings"
+
+        "golang.org/x/net/html/atom"
+)
+
+// A TokenType is the type of a Token.
+type TokenType uint32
+
+const (
+        // ErrorToken means that an error occurred during tokenization.
+        ErrorToken TokenType = iota
+        // TextToken means a text node.
+        TextToken
+        // A StartTagToken looks like <a>.
+        StartTagToken
+        // An EndTagToken looks like </a>.
+        EndTagToken
+        // A SelfClosingTagToken tag looks like <br/>.
+        SelfClosingTagToken
+        // A CommentToken looks like <!--x-->.
+        CommentToken
+        // A DoctypeToken looks like <!DOCTYPE x>
+        DoctypeToken
+)
+
+// ErrBufferExceeded means that the buffering limit was exceeded.
+var ErrBufferExceeded = errors.New("max buffer exceeded")
+
+// String returns a string representation of the TokenType.
+func (t TokenType) String() string {
+        switch t {
+        case ErrorToken:
+                return "Error"
+        case TextToken:
+                return "Text"
+        case StartTagToken:
+                return "StartTag"
+        case EndTagToken:
+                return "EndTag"
+        case SelfClosingTagToken:
+                return "SelfClosingTag"
+        case CommentToken:
+                return "Comment"
+        case DoctypeToken:
+                return "Doctype"
+        }
+        return "Invalid(" + strconv.Itoa(int(t)) + ")"
+}
+
+// An Attribute is an attribute namespace-key-value triple. Namespace is
+// non-empty for foreign attributes like xlink, Key is alphabetic (and hence
+// does not contain escapable characters like '&', '<' or '>'), and Val is
+// unescaped (it looks like "a<b" rather than "a&lt;b").
+//
+// Namespace is only used by the parser, not the tokenizer.
+type Attribute struct {
+        Namespace, Key, Val string
+}
+
+// A Token consists of a TokenType and some Data (tag name for start and end
+// tags, content for text, comments and doctypes). A tag Token may also contain
+// a slice of Attributes. Data is unescaped for all Tokens (it looks like "a<b"
+// rather than "a&lt;b"). For tag Tokens, DataAtom is the atom for Data, or
+// zero if Data is not a known tag name.
+type Token struct {
+        Type     TokenType
+        DataAtom atom.Atom
+        Data     string
+        Attr     []Attribute
+}
+
+// tagString returns a string representation of a tag Token's Data and Attr.
+func (t Token) tagString() string {
+        if len(t.Attr) == 0 {
+                return t.Data
+        }
+        buf := bytes.NewBufferString(t.Data)
+        for _, a := range t.Attr {
+                buf.WriteByte(' ')
+                buf.WriteString(a.Key)
+                buf.WriteString(`="`)
+                escape(buf, a.Val)
+                buf.WriteByte('"')
+        }
+        return buf.String()
+}
+
+// String returns a string representation of the Token.
+func (t Token) String() string {
+        switch t.Type {
+        case ErrorToken:
+                return ""
+        case TextToken:
+                return EscapeString(t.Data)
+        case StartTagToken:
+                return "<" + t.tagString() + ">"
+        case EndTagToken:
+                return "</" + t.tagString() + ">"
+        case SelfClosingTagToken:
+                return "<" + t.tagString() + "/>"
+        case CommentToken:
+                return "<!--" + t.Data + "-->"
+        case DoctypeToken:
+                return "<!DOCTYPE " + t.Data + ">"
+        }
+        return "Invalid(" + strconv.Itoa(int(t.Type)) + ")"
+}
+
+// span is a range of bytes in a Tokenizer's buffer. The start is inclusive,
+// the end is exclusive.
+type span struct {
+        start, end int
+}
+
+// A Tokenizer returns a stream of HTML Tokens.
+type Tokenizer struct {
+        // r is the source of the HTML text.
+        r io.Reader
+        // tt is the TokenType of the current token.
+        tt TokenType
+        // err is the first error encountered during tokenization. It is possible
+        // for tt != Error && err != nil to hold: this means that Next returned a
+        // valid token but the subsequent Next call will return an error token.
+        // For example, if the HTML text input was just "plain", then the first
+        // Next call would set z.err to io.EOF but return a TextToken, and all
+        // subsequent Next calls would return an ErrorToken.
+        // err is never reset. Once it becomes non-nil, it stays non-nil.
+        err error
+        // readErr is the error returned by the io.Reader r. It is separate from
+        // err because it is valid for an io.Reader to return (n int, err1 error)
+        // such that n > 0 && err1 != nil, and callers should always process the
+        // n > 0 bytes before considering the error err1.
+        readErr error
+        // buf[raw.start:raw.end] holds the raw bytes of the current token.
+        // buf[raw.end:] is buffered input that will yield future tokens.
+        raw span
+        buf []byte
+        // maxBuf limits the data buffered in buf. A value of 0 means unlimited.
+        maxBuf int
+        // buf[data.start:data.end] holds the raw bytes of the current token's data:
+        // a text token's text, a tag token's tag name, etc.
+        data span
+        // pendingAttr is the attribute key and value currently being tokenized.
+        // When complete, pendingAttr is pushed onto attr. nAttrReturned is
+        // incremented on each call to TagAttr.
+        pendingAttr   [2]span
+        attr          [][2]span
+        nAttrReturned int
+        // rawTag is the "script" in "</script>" that closes the next token. If
+        // non-empty, the subsequent call to Next will return a raw or RCDATA text
+        // token: one that treats "<p>" as text instead of an element.
+        // rawTag's contents are lower-cased.
+        rawTag string
+        // textIsRaw is whether the current text token's data is not escaped.
+        textIsRaw bool
+        // convertNUL is whether NUL bytes in the current token's data should
+        // be converted into \ufffd replacement characters.
+        convertNUL bool
+        // allowCDATA is whether CDATA sections are allowed in the current context.
+        allowCDATA bool
+}
+
+// AllowCDATA sets whether or not the tokenizer recognizes <![CDATA[foo]]> as
+// the text "foo". The default value is false, which means to recognize it as
+// a bogus comment "<!-- [CDATA[foo]] -->" instead.
+//
+// Strictly speaking, an HTML5 compliant tokenizer should allow CDATA if and
+// only if tokenizing foreign content, such as MathML and SVG. However,
+// tracking foreign-contentness is difficult to do purely in the tokenizer,
+// as opposed to the parser, due to HTML integration points: an <svg> element
+// can contain a <foreignObject> that is foreign-to-SVG but not foreign-to-
+// HTML. For strict compliance with the HTML5 tokenization algorithm, it is the
+// responsibility of the user of a tokenizer to call AllowCDATA as appropriate.
+// In practice, if using the tokenizer without caring whether MathML or SVG
+// CDATA is text or comments, such as tokenizing HTML to find all the anchor
+// text, it is acceptable to ignore this responsibility.
+func (z *Tokenizer) AllowCDATA(allowCDATA bool) {
+        z.allowCDATA = allowCDATA
+}
+
+// NextIsNotRawText instructs the tokenizer that the next token should not be
+// considered as 'raw text'. Some elements, such as script and title elements,
+// normally require the next token after the opening tag to be 'raw text' that
+// has no child elements. For example, tokenizing "<title>a<b>c</b>d</title>"
+// yields a start tag token for "<title>", a text token for "a<b>c</b>d", and
+// an end tag token for "</title>". There are no distinct start tag or end tag
+// tokens for the "<b>" and "</b>".
+//
+// This tokenizer implementation will generally look for raw text at the right
+// times. Strictly speaking, an HTML5 compliant tokenizer should not look for
+// raw text if in foreign content: <title> generally needs raw text, but a
+// <title> inside an <svg> does not. Another example is that a <textarea>
+// generally needs raw text, but a <textarea> is not allowed as an immediate
+// child of a <select>; in normal parsing, a <textarea> implies </select>, but
+// one cannot close the implicit element when parsing a <select>'s InnerHTML.
+// Similarly to AllowCDATA, tracking the correct moment to override raw-text-
+// ness is difficult to do purely in the tokenizer, as opposed to the parser.
+// For strict compliance with the HTML5 tokenization algorithm, it is the
+// responsibility of the user of a tokenizer to call NextIsNotRawText as
+// appropriate. In practice, like AllowCDATA, it is acceptable to ignore this
+// responsibility for basic usage.
+//
+// Note that this 'raw text' concept is different from the one offered by the
+// Tokenizer.Raw method.
+func (z *Tokenizer) NextIsNotRawText() {
+        z.rawTag = ""
+}
+
+// Err returns the error associated with the most recent ErrorToken token.
+// This is typically io.EOF, meaning the end of tokenization.
+func (z *Tokenizer) Err() error {
+        if z.tt != ErrorToken {
+                return nil
+        }
+        return z.err
+}
+
+// readByte returns the next byte from the input stream, doing a buffered read
+// from z.r into z.buf if necessary. z.buf[z.raw.start:z.raw.end] remains a contiguous byte
+// slice that holds all the bytes read so far for the current token.
+// It sets z.err if the underlying reader returns an error.
+// Pre-condition: z.err == nil.
+func (z *Tokenizer) readByte() byte {
+        if z.raw.end >= len(z.buf) {
+                // Our buffer is exhausted and we have to read from z.r. Check if the
+                // previous read resulted in an error.
+                if z.readErr != nil {
+                        z.err = z.readErr
+                        return 0
+                }
+                // We copy z.buf[z.raw.start:z.raw.end] to the beginning of z.buf. If the length
+                // z.raw.end - z.raw.start is more than half the capacity of z.buf, then we
+                // allocate a new buffer before the copy.
+                c := cap(z.buf)
+                d := z.raw.end - z.raw.start
+                var buf1 []byte
+                if 2*d > c {
+                        buf1 = make([]byte, d, 2*c)
+                } else {
+                        buf1 = z.buf[:d]
+                }
+                copy(buf1, z.buf[z.raw.start:z.raw.end])
+                if x := z.raw.start; x != 0 {
+                        // Adjust the data/attr spans to refer to the same contents after the copy.
+                        z.data.start -= x
+                        z.data.end -= x
+                        z.pendingAttr[0].start -= x
+                        z.pendingAttr[0].end -= x
+                        z.pendingAttr[1].start -= x
+                        z.pendingAttr[1].end -= x
+                        for i := range z.attr {
+                                z.attr[i][0].start -= x
+                                z.attr[i][0].end -= x
+                                z.attr[i][1].start -= x
+                                z.attr[i][1].end -= x
+                        }
+                }
+                z.raw.start, z.raw.end, z.buf = 0, d, buf1[:d]
+                // Now that we have copied the live bytes to the start of the buffer,
+                // we read from z.r into the remainder.
+                var n int
+                n, z.readErr = readAtLeastOneByte(z.r, buf1[d:cap(buf1)])
+                if n == 0 {
+                        z.err = z.readErr
+                        return 0
+                }
+                z.buf = buf1[:d+n]
+        }
+        x := z.buf[z.raw.end]
+        z.raw.end++
+        if z.maxBuf > 0 && z.raw.end-z.raw.start >= z.maxBuf {
+                z.err = ErrBufferExceeded
+                return 0
+        }
+        return x
+}
+
+// Buffered returns a slice containing data buffered but not yet tokenized.
+func (z *Tokenizer) Buffered() []byte {
+        return z.buf[z.raw.end:]
+}
+
+// readAtLeastOneByte wraps an io.Reader so that reading cannot return (0, nil).
+// It returns io.ErrNoProgress if the underlying r.Read method returns (0, nil)
+// too many times in succession.
+func readAtLeastOneByte(r io.Reader, b []byte) (int, error) {
+        for i := 0; i < 100; i++ {
+                n, err := r.Read(b)
+                if n != 0 || err != nil {
+                        return n, err
+                }
+        }
+        return 0, io.ErrNoProgress
+}
+
+// skipWhiteSpace skips past any white space.
+func (z *Tokenizer) skipWhiteSpace() {
+        if z.err != nil {
+                return
+        }
+        for {
+                c := z.readByte()
+                if z.err != nil {
+                        return
+                }
+                switch c {
+                case ' ', '\n', '\r', '\t', '\f':
+                        // No-op.
+                default:
+                        z.raw.end--
+                        return
+                }
+        }
+}
+
+// readRawOrRCDATA reads until the next "</foo>", where "foo" is z.rawTag and
+// is typically something like "script" or "textarea".
+func (z *Tokenizer) readRawOrRCDATA() {
+        if z.rawTag == "script" {
+                z.readScript()
+                z.textIsRaw = true
+                z.rawTag = ""
+                return
+        }
+loop:
+        for {
+                c := z.readByte()
+                if z.err != nil {
+                        break loop
+                }
+                if c != '<' {
+                        continue loop
+                }
+                c = z.readByte()
+                if z.err != nil {
+                        break loop
+                }
+                if c != '/' {
+                        continue loop
+                }
+                if z.readRawEndTag() || z.err != nil {
+                        break loop
+                }
+        }
+        z.data.end = z.raw.end
+        // A textarea's or title's RCDATA can contain escaped entities.
+        z.textIsRaw = z.rawTag != "textarea" && z.rawTag != "title"
+        z.rawTag = ""
+}
+
+// readRawEndTag attempts to read a tag like "</foo>", where "foo" is z.rawTag.
+// If it succeeds, it backs up the input position to reconsume the tag and
+// returns true. Otherwise it returns false. The opening "</" has already been
+// consumed.
+func (z *Tokenizer) readRawEndTag() bool {
+        for i := 0; i < len(z.rawTag); i++ {
+                c := z.readByte()
+                if z.err != nil {
+                        return false
+                }
+                if c != z.rawTag[i] && c != z.rawTag[i]-('a'-'A') {
+                        z.raw.end--
+                        return false
+                }
+        }
+        c := z.readByte()
+        if z.err != nil {
+                return false
+        }
+        switch c {
+        case ' ', '\n', '\r', '\t', '\f', '/', '>':
+                // The 3 is 2 for the leading "</" plus 1 for the trailing character c.
+                z.raw.end -= 3 + len(z.rawTag)
+                return true
+        }
+        z.raw.end--
+        return false
+}
+
+// readScript reads until the next </script> tag, following the byzantine
+// rules for escaping/hiding the closing tag.
+func (z *Tokenizer) readScript() {
+        defer func() {
+                z.data.end = z.raw.end
+        }()
+        var c byte
+
+scriptData:
+        c = z.readByte()
+        if z.err != nil {
+                return
+        }
+        if c == '<' {
+                goto scriptDataLessThanSign
+        }
+        goto scriptData
+
+scriptDataLessThanSign:
+        c = z.readByte()
+        if z.err != nil {
+                return
+        }
+        switch c {
+        case '/':
+                goto scriptDataEndTagOpen
+        case '!':
+                goto scriptDataEscapeStart
+        }
+        z.raw.end--
+        goto scriptData
+
+scriptDataEndTagOpen:
+        if z.readRawEndTag() || z.err != nil {
+                return
+        }
+        goto scriptData
+
+scriptDataEscapeStart:
+        c = z.readByte()
+        if z.err != nil {
+                return
+        }
+        if c == '-' {
+                goto scriptDataEscapeStartDash
+        }
+        z.raw.end--
+        goto scriptData
+
+scriptDataEscapeStartDash:
+        c = z.readByte()
+        if z.err != nil {
+                return
+        }
+        if c == '-' {
+                goto scriptDataEscapedDashDash
+        }
+        z.raw.end--
+        goto scriptData
+
+scriptDataEscaped:
+        c = z.readByte()
+        if z.err != nil {
+                return
+        }
+        switch c {
+        case '-':
+                goto scriptDataEscapedDash
+        case '<':
+                goto scriptDataEscapedLessThanSign
+        }
+        goto scriptDataEscaped
+
+scriptDataEscapedDash:
+        c = z.readByte()
+        if z.err != nil {
+                return
+        }
+        switch c {
+        case '-':
+                goto scriptDataEscapedDashDash
+        case '<':
+                goto scriptDataEscapedLessThanSign
+        }
+        goto scriptDataEscaped
+
+scriptDataEscapedDashDash:
+        c = z.readByte()
+        if z.err != nil {
+                return
+        }
+        switch c {
+        case '-':
+                goto scriptDataEscapedDashDash
+        case '<':
+                goto scriptDataEscapedLessThanSign
+        case '>':
+                goto scriptData
+        }
+        goto scriptDataEscaped
+
+scriptDataEscapedLessThanSign:
+        c = z.readByte()
+        if z.err != nil {
+                return
+        }
+        if c == '/' {
+                goto scriptDataEscapedEndTagOpen
+        }
+        if 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' {
+                goto scriptDataDoubleEscapeStart
+        }
+        z.raw.end--
+        goto scriptData
+
+scriptDataEscapedEndTagOpen:
+        if z.readRawEndTag() || z.err != nil {
+                return
+        }
+        goto scriptDataEscaped
+
+scriptDataDoubleEscapeStart:
+        z.raw.end--
+        for i := 0; i < len("script"); i++ {
+                c = z.readByte()
+                if z.err != nil {
+                        return
+                }
+                if c != "script"[i] && c != "SCRIPT"[i] {
+                        z.raw.end--
+                        goto scriptDataEscaped
+                }
+        }
+        c = z.readByte()
+        if z.err != nil {
+                return
+        }
+        switch c {
+        case ' ', '\n', '\r', '\t', '\f', '/', '>':
+                goto scriptDataDoubleEscaped
+        }
+        z.raw.end--
+        goto scriptDataEscaped
+
+scriptDataDoubleEscaped:
+        c = z.readByte()
+        if z.err != nil {
+                return
+        }
+        switch c {
+        case '-':
+                goto scriptDataDoubleEscapedDash
+        case '<':
+                goto scriptDataDoubleEscapedLessThanSign
+        }
+        goto scriptDataDoubleEscaped
+
+scriptDataDoubleEscapedDash:
+        c = z.readByte()
+        if z.err != nil {
+                return
+        }
+        switch c {
+        case '-':
+                goto scriptDataDoubleEscapedDashDash
+        case '<':
+                goto scriptDataDoubleEscapedLessThanSign
+        }
+        goto scriptDataDoubleEscaped
+
+scriptDataDoubleEscapedDashDash:
+        c = z.readByte()
+        if z.err != nil {
+                return
+        }
+        switch c {
+        case '-':
+                goto scriptDataDoubleEscapedDashDash
+        case '<':
+                goto scriptDataDoubleEscapedLessThanSign
+        case '>':
+                goto scriptData
+        }
+        goto scriptDataDoubleEscaped
+
+scriptDataDoubleEscapedLessThanSign:
+        c = z.readByte()
+        if z.err != nil {
+                return
+        }
+        if c == '/' {
+                goto scriptDataDoubleEscapeEnd
+        }
+        z.raw.end--
+        goto scriptDataDoubleEscaped
+
+scriptDataDoubleEscapeEnd:
+        if z.readRawEndTag() {
+                z.raw.end += len("</script>")
+                goto scriptDataEscaped
+        }
+        if z.err != nil {
+                return
+        }
+        goto scriptDataDoubleEscaped
+}
+
+// readComment reads the next comment token starting with "<!--". The opening
+// "<!--" has already been consumed.
+func (z *Tokenizer) readComment() {
+        z.data.start = z.raw.end
+        defer func() {
+                if z.data.end < z.data.start {
+                        // It's a comment with no data, like <!-->.
+                        z.data.end = z.data.start
+                }
+        }()
+        for dashCount := 2; ; {
+                c := z.readByte()
+                if z.err != nil {
+                        // Ignore up to two dashes at EOF.
+                        if dashCount > 2 {
+                                dashCount = 2
+                        }
+                        z.data.end = z.raw.end - dashCount
+                        return
+                }
+                switch c {
+                case '-':
+                        dashCount++
+                        continue
+                case '>':
+                        if dashCount >= 2 {
+                                z.data.end = z.raw.end - len("-->")
+                                return
+                        }
+                case '!':
+                        if dashCount >= 2 {
+                                c = z.readByte()
+                                if z.err != nil {
+                                        z.data.end = z.raw.end
+                                        return
+                                }
+                                if c == '>' {
+                                        z.data.end = z.raw.end - len("--!>")
+                                        return
+                                }
+                        }
+                }
+                dashCount = 0
+        }
+}
+
+// readUntilCloseAngle reads until the next ">".
+func (z *Tokenizer) readUntilCloseAngle() {
+        z.data.start = z.raw.end
+        for {
+                c := z.readByte()
+                if z.err != nil {
+                        z.data.end = z.raw.end
+                        return
+                }
+                if c == '>' {
+                        z.data.end = z.raw.end - len(">")
+                        return
+                }
+        }
+}
+
+// readMarkupDeclaration reads the next token starting with "<!". It might be
+// a "<!--comment-->", a "<!DOCTYPE foo>", a "<![CDATA[section]]>" or
+// "<!a bogus comment". The opening "<!" has already been consumed.
+func (z *Tokenizer) readMarkupDeclaration() TokenType {
+        z.data.start = z.raw.end
+        var c [2]byte
+        for i := 0; i < 2; i++ {
+                c[i] = z.readByte()
+                if z.err != nil {
+                        z.data.end = z.raw.end
+                        return CommentToken
+                }
+        }
+        if c[0] == '-' && c[1] == '-' {
+                z.readComment()
+                return CommentToken
+        }
+        z.raw.end -= 2
+        if z.readDoctype() {
+                return DoctypeToken
+        }
+        if z.allowCDATA && z.readCDATA() {
+                z.convertNUL = true
+                return TextToken
+        }
+        // It's a bogus comment.
+        z.readUntilCloseAngle()
+        return CommentToken
+}
+
+// readDoctype attempts to read a doctype declaration and returns true if
+// successful. The opening "<!" has already been consumed.
+func (z *Tokenizer) readDoctype() bool {
+        const s = "DOCTYPE"
+        for i := 0; i < len(s); i++ {
+                c := z.readByte()
+                if z.err != nil {
+                        z.data.end = z.raw.end
+                        return false
+                }
+                if c != s[i] && c != s[i]+('a'-'A') {
+                        // Back up to read the fragment of "DOCTYPE" again.
+                        z.raw.end = z.data.start
+                        return false
+                }
+        }
+        if z.skipWhiteSpace(); z.err != nil {
+                z.data.start = z.raw.end
+                z.data.end = z.raw.end
+                return true
+        }
+        z.readUntilCloseAngle()
+        return true
+}
+
+// readCDATA attempts to read a CDATA section and returns true if
+// successful. The opening "<!" has already been consumed.
+func (z *Tokenizer) readCDATA() bool {
+        const s = "[CDATA["
+        for i := 0; i < len(s); i++ {
+                c := z.readByte()
+                if z.err != nil {
+                        z.data.end = z.raw.end
+                        return false
+                }
+                if c != s[i] {
+                        // Back up to read the fragment of "[CDATA[" again.
+                        z.raw.end = z.data.start
+                        return false
+                }
+        }
+        z.data.start = z.raw.end
+        brackets := 0
+        for {
+                c := z.readByte()
+                if z.err != nil {
+                        z.data.end = z.raw.end
+                        return true
+                }
+                switch c {
+                case ']':
+                        brackets++
+                case '>':
+                        if brackets >= 2 {
+                                z.data.end = z.raw.end - len("]]>")
+                                return true
+                        }
+                        brackets = 0
+                default:
+                        brackets = 0
+                }
+        }
+}
+
+// startTagIn returns whether the start tag in z.buf[z.data.start:z.data.end]
+// case-insensitively matches any element of ss.
+func (z *Tokenizer) startTagIn(ss ...string) bool {
+loop:
+        for _, s := range ss {
+                if z.data.end-z.data.start != len(s) {
+                        continue loop
+                }
+                for i := 0; i < len(s); i++ {
+                        c := z.buf[z.data.start+i]
+                        if 'A' <= c && c <= 'Z' {
+                                c += 'a' - 'A'
+                        }
+                        if c != s[i] {
+                                continue loop
+                        }
+                }
+                return true
+        }
+        return false
+}
+
+// readStartTag reads the next start tag token. The opening "<a" has already
+// been consumed, where 'a' means anything in [A-Za-z].
+func (z *Tokenizer) readStartTag() TokenType {
+        z.readTag(true)
+        if z.err != nil {
+                return ErrorToken
+        }
+        // Several tags flag the tokenizer's next token as raw.
+        c, raw := z.buf[z.data.start], false
+        if 'A' <= c && c <= 'Z' {
+                c += 'a' - 'A'
+        }
+        switch c {
+        case 'i':
+                raw = z.startTagIn("iframe")
+        case 'n':
+                raw = z.startTagIn("noembed", "noframes", "noscript")
+        case 'p':
+                raw = z.startTagIn("plaintext")
+        case 's':
+                raw = z.startTagIn("script", "style")
+        case 't':
+                raw = z.startTagIn("textarea", "title")
+        case 'x':
+                raw = z.startTagIn("xmp")
+        }
+        if raw {
+                z.rawTag = strings.ToLower(string(z.buf[z.data.start:z.data.end]))
+        }
+        // Look for a self-closing token like "<br/>".
+        if z.err == nil && z.buf[z.raw.end-2] == '/' {
+                return SelfClosingTagToken
+        }
+        return StartTagToken
+}
+
+// readTag reads the next tag token and its attributes. If saveAttr, those
+// attributes are saved in z.attr, otherwise z.attr is set to an empty slice.
+// The opening "<a" or "</a" has already been consumed, where 'a' means anything
+// in [A-Za-z].
+func (z *Tokenizer) readTag(saveAttr bool) {
+        z.attr = z.attr[:0]
+        z.nAttrReturned = 0
+        // Read the tag name and attribute key/value pairs.
+        z.readTagName()
+        if z.skipWhiteSpace(); z.err != nil {
+                return
+        }
+        for {
+                c := z.readByte()
+                if z.err != nil || c == '>' {
+                        break
+                }
+                z.raw.end--
+                z.readTagAttrKey()
+                z.readTagAttrVal()
+                // Save pendingAttr if saveAttr and that attribute has a non-empty key.
+                if saveAttr && z.pendingAttr[0].start != z.pendingAttr[0].end {
+                        z.attr = append(z.attr, z.pendingAttr)
+                }
+                if z.skipWhiteSpace(); z.err != nil {
+                        break
+                }
+        }
+}
+
+// readTagName sets z.data to the "div" in "<div k=v>". The reader (z.raw.end)
+// is positioned such that the first byte of the tag name (the "d" in "<div")
+// has already been consumed.
+func (z *Tokenizer) readTagName() {
+        z.data.start = z.raw.end - 1
+        for {
+                c := z.readByte()
+                if z.err != nil {
+                        z.data.end = z.raw.end
+                        return
+                }
+                switch c {
+                case ' ', '\n', '\r', '\t', '\f':
+                        z.data.end = z.raw.end - 1
+                        return
+                case '/', '>':
+                        z.raw.end--
+                        z.data.end = z.raw.end
+                        return
+                }
+        }
+}
+
+// readTagAttrKey sets z.pendingAttr[0] to the "k" in "<div k=v>".
+// Precondition: z.err == nil.
+func (z *Tokenizer) readTagAttrKey() {
+        z.pendingAttr[0].start = z.raw.end
+        for {
+                c := z.readByte()
+                if z.err != nil {
+                        z.pendingAttr[0].end = z.raw.end
+                        return
+                }
+                switch c {
+                case ' ', '\n', '\r', '\t', '\f', '/':
+                        z.pendingAttr[0].end = z.raw.end - 1
+                        return
+                case '=', '>':
+                        z.raw.end--
+                        z.pendingAttr[0].end = z.raw.end
+                        return
+                }
+        }
+}
+
+// readTagAttrVal sets z.pendingAttr[1] to the "v" in "<div k=v>".
+func (z *Tokenizer) readTagAttrVal() {
+        z.pendingAttr[1].start = z.raw.end
+        z.pendingAttr[1].end = z.raw.end
+        if z.skipWhiteSpace(); z.err != nil {
+                return
+        }
+        c := z.readByte()
+        if z.err != nil {
+                return
+        }
+        if c != '=' {
+                z.raw.end--
+                return
+        }
+        if z.skipWhiteSpace(); z.err != nil {
+                return
+        }
+        quote := z.readByte()
+        if z.err != nil {
+                return
+        }
+        switch quote {
+        case '>':
+                z.raw.end--
+                return
+
+        case '\'', '"':
+                z.pendingAttr[1].start = z.raw.end
+                for {
+                        c := z.readByte()
+                        if z.err != nil {
+                                z.pendingAttr[1].end = z.raw.end
+                                return
+                        }
+                        if c == quote {
+                                z.pendingAttr[1].end = z.raw.end - 1
+                                return
+                        }
+                }
+
+        default:
+                z.pendingAttr[1].start = z.raw.end - 1
+                for {
+                        c := z.readByte()
+                        if z.err != nil {
+                                z.pendingAttr[1].end = z.raw.end
+                                return
+                        }
+                        switch c {
+                        case ' ', '\n', '\r', '\t', '\f':
+                                z.pendingAttr[1].end = z.raw.end - 1
+                                return
+                        case '>':
+                                z.raw.end--
+                                z.pendingAttr[1].end = z.raw.end
+                                return
+                        }
+                }
+        }
+}
+
+// Next scans the next token and returns its type.
+func (z *Tokenizer) Next() TokenType {
+        z.raw.start = z.raw.end
+        z.data.start = z.raw.end
+        z.data.end = z.raw.end
+        if z.err != nil {
+                z.tt = ErrorToken
+                return z.tt
+        }
+        if z.rawTag != "" {
+                if z.rawTag == "plaintext" {
+                        // Read everything up to EOF.
+                        for z.err == nil {
+                                z.readByte()
+                        }
+                        z.data.end = z.raw.end
+                        z.textIsRaw = true
+                } else {
+                        z.readRawOrRCDATA()
+                }
+                if z.data.end > z.data.start {
+                        z.tt = TextToken
+                        z.convertNUL = true
+                        return z.tt
+                }
+        }
+        z.textIsRaw = false
+        z.convertNUL = false
+
+loop:
+        for {
+                c := z.readByte()
+                if z.err != nil {
+                        break loop
+                }
+                if c != '<' {
+                        continue loop
+                }
+
+                // Check if the '<' we have just read is part of a tag, comment
+                // or doctype. If not, it's part of the accumulated text token.
+                c = z.readByte()
+                if z.err != nil {
+                        break loop
+                }
+                var tokenType TokenType
+                switch {
+                case 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z':
+                        tokenType = StartTagToken
+                case c == '/':
+                        tokenType = EndTagToken
+                case c == '!' || c == '?':
+                        // We use CommentToken to mean any of "<!--actual comments-->",
+                        // "<!DOCTYPE declarations>" and "<?xml processing instructions?>".
+                        tokenType = CommentToken
+                default:
+                        // Reconsume the current character.
+                        z.raw.end--
+                        continue
+                }
+
+                // We have a non-text token, but we might have accumulated some text
+                // before that. If so, we return the text first, and return the non-
+                // text token on the subsequent call to Next.
+                if x := z.raw.end - len("<a"); z.raw.start < x {
+                        z.raw.end = x
+                        z.data.end = x
+                        z.tt = TextToken
+                        return z.tt
+                }
+                switch tokenType {
+                case StartTagToken:
+                        z.tt = z.readStartTag()
+                        return z.tt
+                case EndTagToken:
+                        c = z.readByte()
+                        if z.err != nil {
+                                break loop
+                        }
+                        if c == '>' {
+                                // "</>" does not generate a token at all. Generate an empty comment
+                                // to allow passthrough clients to pick up the data using Raw.
+                                // Reset the tokenizer state and start again.
+                                z.tt = CommentToken
+                                return z.tt
+                        }
+                        if 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' {
+                                z.readTag(false)
+                                if z.err != nil {
+                                        z.tt = ErrorToken
+                                } else {
+                                        z.tt = EndTagToken
+                                }
+                                return z.tt
+                        }
+                        z.raw.end--
+                        z.readUntilCloseAngle()
+                        z.tt = CommentToken
+                        return z.tt
+                case CommentToken:
+                        if c == '!' {
+                                z.tt = z.readMarkupDeclaration()
+                                return z.tt
+                        }
+                        z.raw.end--
+                        z.readUntilCloseAngle()
+                        z.tt = CommentToken
+                        return z.tt
+                }
+        }
+        if z.raw.start < z.raw.end {
+                z.data.end = z.raw.end
+                z.tt = TextToken
+                return z.tt
+        }
+        z.tt = ErrorToken
+        return z.tt
+}
+
+// Raw returns the unmodified text of the current token. Calling Next, Token,
+// Text, TagName or TagAttr may change the contents of the returned slice.
+func (z *Tokenizer) Raw() []byte {
+        return z.buf[z.raw.start:z.raw.end]
+}
+
+// convertNewlines converts "\r" and "\r\n" in s to "\n".
+// The conversion happens in place, but the resulting slice may be shorter.
+func convertNewlines(s []byte) []byte {
+        for i, c := range s {
+                if c != '\r' {
+                        continue
+                }
+
+                src := i + 1
+                if src >= len(s) || s[src] != '\n' {
+                        s[i] = '\n'
+                        continue
+                }
+
+                dst := i
+                for src < len(s) {
+                        if s[src] == '\r' {
+                                if src+1 < len(s) && s[src+1] == '\n' {
+                                        src++
+                                }
+                                s[dst] = '\n'
+                        } else {
+                                s[dst] = s[src]
+                        }
+                        src++
+                        dst++
+                }
+                return s[:dst]
+        }
+        return s
+}
+
+var (
+        nul         = []byte("\x00")
+        replacement = []byte("\ufffd")
+)
+
+// Text returns the unescaped text of a text, comment or doctype token. The
+// contents of the returned slice may change on the next call to Next.
+func (z *Tokenizer) Text() []byte {
+        switch z.tt {
+        case TextToken, CommentToken, DoctypeToken:
+                s := z.buf[z.data.start:z.data.end]
+                z.data.start = z.raw.end
+                z.data.end = z.raw.end
+                s = convertNewlines(s)
+                if (z.convertNUL || z.tt == CommentToken) && bytes.Contains(s, nul) {
+                        s = bytes.Replace(s, nul, replacement, -1)
+                }
+                if !z.textIsRaw {
+                        s = unescape(s, false)
+                }
+                return s
+        }
+        return nil
+}
+
+// TagName returns the lower-cased name of a tag token (the `img` out of
+// `<IMG SRC="foo">`) and whether the tag has attributes.
+// The contents of the returned slice may change on the next call to Next.
+func (z *Tokenizer) TagName() (name []byte, hasAttr bool) {
+        if z.data.start < z.data.end {
+                switch z.tt {
+                case StartTagToken, EndTagToken, SelfClosingTagToken:
+                        s := z.buf[z.data.start:z.data.end]
+                        z.data.start = z.raw.end
+                        z.data.end = z.raw.end
+                        return lower(s), z.nAttrReturned < len(z.attr)
+                }
+        }
+        return nil, false
+}
+
+// TagAttr returns the lower-cased key and unescaped value of the next unparsed
+// attribute for the current tag token and whether there are more attributes.
+// The contents of the returned slices may change on the next call to Next.
+func (z *Tokenizer) TagAttr() (key, val []byte, moreAttr bool) {
+        if z.nAttrReturned < len(z.attr) {
+                switch z.tt {
+                case StartTagToken, SelfClosingTagToken:
+                        x := z.attr[z.nAttrReturned]
+                        z.nAttrReturned++
+                        key = z.buf[x[0].start:x[0].end]
+                        val = z.buf[x[1].start:x[1].end]
+                        return lower(key), unescape(convertNewlines(val), true), z.nAttrReturned < len(z.attr)
+                }
+        }
+        return nil, nil, false
+}
+
+// Token returns the next Token. The result's Data and Attr values remain valid
+// after subsequent Next calls.
+func (z *Tokenizer) Token() Token {
+        t := Token{Type: z.tt}
+        switch z.tt {
+        case TextToken, CommentToken, DoctypeToken:
+                t.Data = string(z.Text())
+        case StartTagToken, SelfClosingTagToken, EndTagToken:
+                name, moreAttr := z.TagName()
+                for moreAttr {
+                        var key, val []byte
+                        key, val, moreAttr = z.TagAttr()
+                        t.Attr = append(t.Attr, Attribute{"", atom.String(key), string(val)})
+                }
+                if a := atom.Lookup(name); a != 0 {
+                        t.DataAtom, t.Data = a, a.String()
+                } else {
+                        t.DataAtom, t.Data = 0, string(name)
+                }
+        }
+        return t
+}
+
+// SetMaxBuf sets a limit on the amount of data buffered during tokenization.
+// A value of 0 means unlimited.
+func (z *Tokenizer) SetMaxBuf(n int) {
+        z.maxBuf = n
+}
+
+// NewTokenizer returns a new HTML Tokenizer for the given Reader.
+// The input is assumed to be UTF-8 encoded.
+func NewTokenizer(r io.Reader) *Tokenizer {
+        return NewTokenizerFragment(r, "")
+}
+
+// NewTokenizerFragment returns a new HTML Tokenizer for the given Reader, for
+// tokenizing an existing element's InnerHTML fragment. contextTag is that
+// element's tag, such as "div" or "iframe".
+//
+// For example, how the InnerHTML "a<b" is tokenized depends on whether it is
+// for a <p> tag or a <script> tag.
+//
+// The input is assumed to be UTF-8 encoded.
+func NewTokenizerFragment(r io.Reader, contextTag string) *Tokenizer {
+        z := &Tokenizer{
+                r:   r,
+                buf: make([]byte, 0, 4096),
+        }
+        if contextTag != "" {
+                switch s := strings.ToLower(contextTag); s {
+                case "iframe", "noembed", "noframes", "noscript", "plaintext", "script", "style", "title", "textarea", "xmp":
+                        z.rawTag = s
+                }
+        }
+        return z
+}
diff --git a/vendor/vendor.json b/vendor/vendor.json
index 4783ba8..8b44fbd 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -227,6 +227,12 @@
                         "revisionTime": "2014-04-22T17:41:19Z"
                 },
                 {
+                        "checksumSHA1": "OT4XN9z5k69e2RsMSpwW74B+yk4=",
+                        "path": "github.com/blang/semver",
+                        "revision": "2ee87856327ba09384cabd113bc6b5d174e9ec0f",
+                        "revisionTime": "2017-07-27T06:48:18Z"
+                },
+                {
                         "checksumSHA1": "dvabztWVQX8f6oMLRyv4dLH+TGY=",
                         "path": "github.com/davecgh/go-spew/spew",
                         "revision": "346938d642f2ec3594ed81d874461961cd0faa76",
@@ -252,6 +258,12 @@
                         "revision": "7554cd9344cec97297fa6649b055a8c98c2a1e55"
                 },
                 {
+                        "checksumSHA1": "b8F628srIitj5p7Y130xc9k0QWs=",
+                        "path": "github.com/hashicorp/go-cleanhttp",
+                        "revision": "3573b8b52aa7b37b9358d966a898feb387f62437",
+                        "revisionTime": "2017-02-11T01:34:15Z"
+                },
+                {
                         "checksumSHA1": "nsL2kI426RMuq1jw15e7igFqdIY=",
                         "path": "github.com/hashicorp/go-getter",
                         "revision": "c3d66e76678dce180a7b452653472f949aedfbcd",
@@ -370,116 +382,130 @@
                         "revisionTime": "2015-06-09T07:04:31Z"
                 },
                 {
-                        "checksumSHA1": "BcxYPk5ME2ZyrHS1yK7gK9mzS1A=",
+                        "checksumSHA1": "KPrCMDPNcLmO7K6xPcJSl86LwPk=",
                         "path": "github.com/hashicorp/terraform/config",
-                        "revision": "8d560482c34e865458fd884cb0790b4f73f09ad1",
-                        "revisionTime": "2017-06-08T00:14:54Z",
-                        "version": "v0.9.8",
-                        "versionExact": "v0.9.8"
+                        "revision": "2041053ee9444fa8175a298093b55a89586a1823",
+                        "revisionTime": "2017-08-02T18:39:14Z",
+                        "version": "v0.10.0",
+                        "versionExact": "v0.10.0"
                 },
                 {
-                        "checksumSHA1": "YiREjXkb7CDMZuUmkPGK0yySe8A=",
+                        "checksumSHA1": "uPCJ6seQo9kvoNSfwNWKX9KzVMk=",
                         "path": "github.com/hashicorp/terraform/config/module",
-                        "revision": "8d560482c34e865458fd884cb0790b4f73f09ad1",
-                        "revisionTime": "2017-06-08T00:14:54Z",
-                        "version": "v0.9.8",
-                        "versionExact": "v0.9.8"
+                        "revision": "2041053ee9444fa8175a298093b55a89586a1823",
+                        "revisionTime": "2017-08-02T18:39:14Z",
+                        "version": "v0.10.0",
+                        "versionExact": "v0.10.0"
                 },
                 {
                         "checksumSHA1": "w+l+UGTmwYNJ+L0p2vTd6+yqjok=",
                         "path": "github.com/hashicorp/terraform/dag",
-                        "revision": "8d560482c34e865458fd884cb0790b4f73f09ad1",
-                        "revisionTime": "2017-06-08T00:14:54Z",
-                        "version": "v0.9.8",
-                        "versionExact": "v0.9.8"
+                        "revision": "2041053ee9444fa8175a298093b55a89586a1823",
+                        "revisionTime": "2017-08-02T18:39:14Z",
+                        "version": "v0.10.0",
+                        "versionExact": "v0.10.0"
                 },
                 {
-                        "checksumSHA1": "p4y7tbu9KD/3cKQKe92I3DyjgRc=",
+                        "checksumSHA1": "P8gNPDuOzmiK4Lz9xG7OBy4Rlm8=",
                         "path": "github.com/hashicorp/terraform/flatmap",
-                        "revision": "8d560482c34e865458fd884cb0790b4f73f09ad1",
-                        "revisionTime": "2017-06-08T00:14:54Z",
-                        "version": "v0.9.8",
-                        "versionExact": "v0.9.8"
+                        "revision": "2041053ee9444fa8175a298093b55a89586a1823",
+                        "revisionTime": "2017-08-02T18:39:14Z",
+                        "version": "v0.10.0",
+                        "versionExact": "v0.10.0"
                 },
                 {
                         "checksumSHA1": "uT6Q9RdSRAkDjyUgQlJ2XKJRab4=",
                         "path": "github.com/hashicorp/terraform/helper/config",
-                        "revision": "8d560482c34e865458fd884cb0790b4f73f09ad1",
-                        "revisionTime": "2017-06-08T00:14:54Z",
-                        "version": "v0.9.8",
-                        "versionExact": "v0.9.8"
+                        "revision": "2041053ee9444fa8175a298093b55a89586a1823",
+                        "revisionTime": "2017-08-02T18:39:14Z",
+                        "version": "v0.10.0",
+                        "versionExact": "v0.10.0"
                 },
                 {
                         "checksumSHA1": "Vbo55GDzPgG/L/+W2pcvDhxrPZc=",
                         "path": "github.com/hashicorp/terraform/helper/experiment",
-                        "revision": "8d560482c34e865458fd884cb0790b4f73f09ad1",
-                        "revisionTime": "2017-06-08T00:14:54Z",
-                        "version": "v0.9.8",
-                        "versionExact": "v0.9.8"
+                        "revision": "2041053ee9444fa8175a298093b55a89586a1823",
+                        "revisionTime": "2017-08-02T18:39:14Z",
+                        "version": "v0.10.0",
+                        "versionExact": "v0.10.0"
                 },
                 {
                         "checksumSHA1": "BmIPKTr0zDutSJdyq7pYXrK1I3E=",
                         "path": "github.com/hashicorp/terraform/helper/hashcode",
-                        "revision": "8d560482c34e865458fd884cb0790b4f73f09ad1",
-                        "revisionTime": "2017-06-08T00:14:54Z",
-                        "version": "v0.9.8",
-                        "versionExact": "v0.9.8"
+                        "revision": "2041053ee9444fa8175a298093b55a89586a1823",
+                        "revisionTime": "2017-08-02T18:39:14Z",
+                        "version": "v0.10.0",
+                        "versionExact": "v0.10.0"
                 },
                 {
                         "checksumSHA1": "B267stWNQd0/pBTXHfI/tJsxzfc=",
                         "path": "github.com/hashicorp/terraform/helper/hilmapstructure",
-                        "revision": "8d560482c34e865458fd884cb0790b4f73f09ad1",
-                        "revisionTime": "2017-06-08T00:14:54Z",
-                        "version": "v0.9.8",
-                        "versionExact": "v0.9.8"
+                        "revision": "2041053ee9444fa8175a298093b55a89586a1823",
+                        "revisionTime": "2017-08-02T18:39:14Z",
+                        "version": "v0.10.0",
+                        "versionExact": "v0.10.0"
                 },
                 {
                         "checksumSHA1": "2wJa9F3BGlbe2DNqH5lb5POayRI=",
                         "path": "github.com/hashicorp/terraform/helper/logging",
-                        "revision": "8d560482c34e865458fd884cb0790b4f73f09ad1",
-                        "revisionTime": "2017-06-08T00:14:54Z",
-                        "version": "v0.9.8",
-                        "versionExact": "v0.9.8"
+                        "revision": "2041053ee9444fa8175a298093b55a89586a1823",
+                        "revisionTime": "2017-08-02T18:39:14Z",
+                        "version": "v0.10.0",
+                        "versionExact": "v0.10.0"
                 },
                 {
-                        "checksumSHA1": "8VL90fHe5YRasHcZwv2q2qms/Jo=",
+                        "checksumSHA1": "dhU2woQaSEI2OnbYLdkHxf7/nu8=",
                         "path": "github.com/hashicorp/terraform/helper/resource",
-                        "revision": "8d560482c34e865458fd884cb0790b4f73f09ad1",
-                        "revisionTime": "2017-06-08T00:14:54Z",
-                        "version": "v0.9.8",
-                        "versionExact": "v0.9.8"
+                        "revision": "2041053ee9444fa8175a298093b55a89586a1823",
+                        "revisionTime": "2017-08-02T18:39:14Z",
+                        "version": "v0.10.0",
+                        "versionExact": "v0.10.0"
                 },
                 {
-                        "checksumSHA1": "bgaeB6ivKIK5H+7JCsp7w8aAdAg=",
+                        "checksumSHA1": "0smlb90amL15c/6nWtW4DV6Lqh8=",
                         "path": "github.com/hashicorp/terraform/helper/schema",
-                        "revision": "8d560482c34e865458fd884cb0790b4f73f09ad1",
-                        "revisionTime": "2017-06-08T00:14:54Z",
-                        "version": "v0.9.8",
-                        "versionExact": "v0.9.8"
+                        "revision": "2041053ee9444fa8175a298093b55a89586a1823",
+                        "revisionTime": "2017-08-02T18:39:14Z",
+                        "version": "v0.10.0",
+                        "versionExact": "v0.10.0"
                 },
                 {
-                        "checksumSHA1": "oLui7dYxhzfAczwwdNZDm4tzHtk=",
+                        "checksumSHA1": "1yCGh/Wl4H4ODBBRmIRFcV025b0=",
                         "path": "github.com/hashicorp/terraform/helper/shadow",
-                        "revision": "8d560482c34e865458fd884cb0790b4f73f09ad1",
-                        "revisionTime": "2017-06-08T00:14:54Z",
-                        "version": "v0.9.8",
-                        "versionExact": "v0.9.8"
+                        "revision": "2041053ee9444fa8175a298093b55a89586a1823",
+                        "revisionTime": "2017-08-02T18:39:14Z",
+                        "version": "v0.10.0",
+                        "versionExact": "v0.10.0"
                 },
                 {
-                        "checksumSHA1": "6AA7ZAzswfl7SOzleP6e6he0lq4=",
+                        "checksumSHA1": "yFWmdS6yEJZpRJzUqd/mULqCYGk=",
+                        "path": "github.com/hashicorp/terraform/moduledeps",
+                        "revision": "5bcc1bae5925f44208a83279b6d4d250da01597b",
+                        "revisionTime": "2017-08-09T21:54:59Z"
+                },
+                {
+                        "checksumSHA1": "4ODNVUds3lyBf7gV02X1EeYR4GA=",
                         "path": "github.com/hashicorp/terraform/plugin",
-                        "revision": "8d560482c34e865458fd884cb0790b4f73f09ad1",
-                        "revisionTime": "2017-06-08T00:14:54Z",
-                        "version": "v0.9.8",
-                        "versionExact": "v0.9.8"
+                        "revision": "2041053ee9444fa8175a298093b55a89586a1823",
+                        "revisionTime": "2017-08-02T18:39:14Z",
+                        "version": "v0.10.0",
+                        "versionExact": "v0.10.0"
                 },
                 {
-                        "checksumSHA1": "GfGSXndpVIh9sSeNf+b1TjxBEpQ=",
+                        "checksumSHA1": "mujz3BDg1X82ynvJncCFUT6/7XI=",
+                        "path": "github.com/hashicorp/terraform/plugin/discovery",
+                        "revision": "2041053ee9444fa8175a298093b55a89586a1823",
+                        "revisionTime": "2017-08-02T18:39:14Z",
+                        "version": "v0.10.0",
+                        "versionExact": "v0.10.0"
+                },
+                {
+                        "checksumSHA1": "ksfNQjZs/6llziARojABd6iuvdw=",
                         "path": "github.com/hashicorp/terraform/terraform",
-                        "revision": "8d560482c34e865458fd884cb0790b4f73f09ad1",
-                        "revisionTime": "2017-06-08T00:14:54Z",
-                        "version": "v0.9.8",
-                        "versionExact": "v0.9.8"
+                        "revision": "2041053ee9444fa8175a298093b55a89586a1823",
+                        "revisionTime": "2017-08-02T18:39:14Z",
+                        "version": "v0.10.0",
+                        "versionExact": "v0.10.0"
                 },
                 {
                         "checksumSHA1": "ZhK6IO2XN81Y+3RAjTcVm1Ic7oU=",
@@ -548,6 +574,60 @@
                         "revisionTime": "2016-10-31T15:37:30Z"
                 },
                 {
+                        "checksumSHA1": "TT1rac6kpQp2vz24m5yDGUNQ/QQ=",
+                        "path": "golang.org/x/crypto/cast5",
+                        "revision": "b176d7def5d71bdd214203491f89843ed217f420",
+                        "revisionTime": "2017-07-23T04:49:35Z"
+                },
+                {
+                        "checksumSHA1": "IIhFTrLlmlc6lEFSitqi4aw2lw0=",
+                        "path": "golang.org/x/crypto/openpgp",
+                        "revision": "b176d7def5d71bdd214203491f89843ed217f420",
+                        "revisionTime": "2017-07-23T04:49:35Z"
+                },
+                {
+                        "checksumSHA1": "olOKkhrdkYQHZ0lf1orrFQPQrv4=",
+                        "path": "golang.org/x/crypto/openpgp/armor",
+                        "revision": "b176d7def5d71bdd214203491f89843ed217f420",
+                        "revisionTime": "2017-07-23T04:49:35Z"
+                },
+                {
+                        "checksumSHA1": "eo/KtdjieJQXH7Qy+faXFcF70ME=",
+                        "path": "golang.org/x/crypto/openpgp/elgamal",
+                        "revision": "b176d7def5d71bdd214203491f89843ed217f420",
+                        "revisionTime": "2017-07-23T04:49:35Z"
+                },
+                {
+                        "checksumSHA1": "rlxVSaGgqdAgwblsErxTxIfuGfg=",
+                        "path": "golang.org/x/crypto/openpgp/errors",
+                        "revision": "b176d7def5d71bdd214203491f89843ed217f420",
+                        "revisionTime": "2017-07-23T04:49:35Z"
+                },
+                {
+                        "checksumSHA1": "Pq88+Dgh04UdXWZN6P+bLgYnbRc=",
+                        "path": "golang.org/x/crypto/openpgp/packet",
+                        "revision": "b176d7def5d71bdd214203491f89843ed217f420",
+                        "revisionTime": "2017-07-23T04:49:35Z"
+                },
+                {
+                        "checksumSHA1": "s2qT4UwvzBSkzXuiuMkowif1Olw=",
+                        "path": "golang.org/x/crypto/openpgp/s2k",
+                        "revision": "b176d7def5d71bdd214203491f89843ed217f420",
+                        "revisionTime": "2017-07-23T04:49:35Z"
+                },
+                {
+                        "checksumSHA1": "vqc3a+oTUGX8PmD0TS+qQ7gmN8I=",
+                        "path": "golang.org/x/net/html",
+                        "revision": "1c05540f6879653db88113bc4a2b70aec4bd491f",
+                        "revisionTime": "2017-08-04T00:04:37Z"
+                },
+                {
+                        "checksumSHA1": "z79z5msRzgU48FCZxSuxfU8b4rs=",
+                        "path": "golang.org/x/net/html/atom",
+                        "revision": "1c05540f6879653db88113bc4a2b70aec4bd491f",
+                        "revisionTime": "2017-08-04T00:04:37Z"
+                },
+                {
                         "checksumSHA1": "wICWAGQfZcHD2y0dHesz9R2YSiw=",
                         "path": "k8s.io/kubernetes/pkg/apimachinery",
                         "revision": "b0b7a323cc5a4a2019b2e9520c21c7830b7f708e",