2 files changed, 379 insertions, 0 deletions

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
+}