Transfer of provider code

37 files changed, 778 insertions, 14543 deletions

diff --git a/vendor/golang.org/x/crypto/bcrypt/base64.go b/vendor/golang.org/x/crypto/bcrypt/base64.go
new file mode 100644
index 0000000..fc31160
--- /dev/null
+++ b/vendor/golang.org/x/crypto/bcrypt/base64.go
@@ -0,0 +1,35 @@
+// 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 bcrypt
+
+import "encoding/base64"
+
+const alphabet = "./ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
+
+var bcEncoding = base64.NewEncoding(alphabet)
+
+func base64Encode(src []byte) []byte {
+        n := bcEncoding.EncodedLen(len(src))
+        dst := make([]byte, n)
+        bcEncoding.Encode(dst, src)
+        for dst[n-1] == '=' {
+                n--
+        }
+        return dst[:n]
+}
+
+func base64Decode(src []byte) ([]byte, error) {
+        numOfEquals := 4 - (len(src) % 4)
+        for i := 0; i < numOfEquals; i++ {
+                src = append(src, '=')
+        }
+
+        dst := make([]byte, bcEncoding.DecodedLen(len(src)))
+        n, err := bcEncoding.Decode(dst, src)
+        if err != nil {
+                return nil, err
+        }
+        return dst[:n], nil
+}
diff --git a/vendor/golang.org/x/crypto/bcrypt/bcrypt.go b/vendor/golang.org/x/crypto/bcrypt/bcrypt.go
new file mode 100644
index 0000000..f8b807f
--- /dev/null
+++ b/vendor/golang.org/x/crypto/bcrypt/bcrypt.go
@@ -0,0 +1,294 @@
+// 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 bcrypt implements Provos and Mazières's bcrypt adaptive hashing
+// algorithm. See http://www.usenix.org/event/usenix99/provos/provos.pdf
+package bcrypt // import "golang.org/x/crypto/bcrypt"
+
+// The code is a port of Provos and Mazières's C implementation.
+import (
+        "crypto/rand"
+        "crypto/subtle"
+        "errors"
+        "fmt"
+        "golang.org/x/crypto/blowfish"
+        "io"
+        "strconv"
+)
+
+const (
+        MinCost     int = 4  // the minimum allowable cost as passed in to GenerateFromPassword
+        MaxCost     int = 31 // the maximum allowable cost as passed in to GenerateFromPassword
+        DefaultCost int = 10 // the cost that will actually be set if a cost below MinCost is passed into GenerateFromPassword
+)
+
+// The error returned from CompareHashAndPassword when a password and hash do
+// not match.
+var ErrMismatchedHashAndPassword = errors.New("crypto/bcrypt: hashedPassword is not the hash of the given password")
+
+// The error returned from CompareHashAndPassword when a hash is too short to
+// be a bcrypt hash.
+var ErrHashTooShort = errors.New("crypto/bcrypt: hashedSecret too short to be a bcrypted password")
+
+// The error returned from CompareHashAndPassword when a hash was created with
+// a bcrypt algorithm newer than this implementation.
+type HashVersionTooNewError byte
+
+func (hv HashVersionTooNewError) Error() string {
+        return fmt.Sprintf("crypto/bcrypt: bcrypt algorithm version '%c' requested is newer than current version '%c'", byte(hv), majorVersion)
+}
+
+// The error returned from CompareHashAndPassword when a hash starts with something other than '$'
+type InvalidHashPrefixError byte
+
+func (ih InvalidHashPrefixError) Error() string {
+        return fmt.Sprintf("crypto/bcrypt: bcrypt hashes must start with '$', but hashedSecret started with '%c'", byte(ih))
+}
+
+type InvalidCostError int
+
+func (ic InvalidCostError) Error() string {
+        return fmt.Sprintf("crypto/bcrypt: cost %d is outside allowed range (%d,%d)", int(ic), int(MinCost), int(MaxCost))
+}
+
+const (
+        majorVersion       = '2'
+        minorVersion       = 'a'
+        maxSaltSize        = 16
+        maxCryptedHashSize = 23
+        encodedSaltSize    = 22
+        encodedHashSize    = 31
+        minHashSize        = 59
+)
+
+// magicCipherData is an IV for the 64 Blowfish encryption calls in
+// bcrypt(). It's the string "OrpheanBeholderScryDoubt" in big-endian bytes.
+var magicCipherData = []byte{
+        0x4f, 0x72, 0x70, 0x68,
+        0x65, 0x61, 0x6e, 0x42,
+        0x65, 0x68, 0x6f, 0x6c,
+        0x64, 0x65, 0x72, 0x53,
+        0x63, 0x72, 0x79, 0x44,
+        0x6f, 0x75, 0x62, 0x74,
+}
+
+type hashed struct {
+        hash  []byte
+        salt  []byte
+        cost  int // allowed range is MinCost to MaxCost
+        major byte
+        minor byte
+}
+
+// GenerateFromPassword returns the bcrypt hash of the password at the given
+// cost. If the cost given is less than MinCost, the cost will be set to
+// DefaultCost, instead. Use CompareHashAndPassword, as defined in this package,
+// to compare the returned hashed password with its cleartext version.
+func GenerateFromPassword(password []byte, cost int) ([]byte, error) {
+        p, err := newFromPassword(password, cost)
+        if err != nil {
+                return nil, err
+        }
+        return p.Hash(), nil
+}
+
+// CompareHashAndPassword compares a bcrypt hashed password with its possible
+// plaintext equivalent. Returns nil on success, or an error on failure.
+func CompareHashAndPassword(hashedPassword, password []byte) error {
+        p, err := newFromHash(hashedPassword)
+        if err != nil {
+                return err
+        }
+
+        otherHash, err := bcrypt(password, p.cost, p.salt)
+        if err != nil {
+                return err
+        }
+
+        otherP := &hashed{otherHash, p.salt, p.cost, p.major, p.minor}
+        if subtle.ConstantTimeCompare(p.Hash(), otherP.Hash()) == 1 {
+                return nil
+        }
+
+        return ErrMismatchedHashAndPassword
+}
+
+// Cost returns the hashing cost used to create the given hashed
+// password. When, in the future, the hashing cost of a password system needs
+// to be increased in order to adjust for greater computational power, this
+// function allows one to establish which passwords need to be updated.
+func Cost(hashedPassword []byte) (int, error) {
+        p, err := newFromHash(hashedPassword)
+        if err != nil {
+                return 0, err
+        }
+        return p.cost, nil
+}
+
+func newFromPassword(password []byte, cost int) (*hashed, error) {
+        if cost < MinCost {
+                cost = DefaultCost
+        }
+        p := new(hashed)
+        p.major = majorVersion
+        p.minor = minorVersion
+
+        err := checkCost(cost)
+        if err != nil {
+                return nil, err
+        }
+        p.cost = cost
+
+        unencodedSalt := make([]byte, maxSaltSize)
+        _, err = io.ReadFull(rand.Reader, unencodedSalt)
+        if err != nil {
+                return nil, err
+        }
+
+        p.salt = base64Encode(unencodedSalt)
+        hash, err := bcrypt(password, p.cost, p.salt)
+        if err != nil {
+                return nil, err
+        }
+        p.hash = hash
+        return p, err
+}
+
+func newFromHash(hashedSecret []byte) (*hashed, error) {
+        if len(hashedSecret) < minHashSize {
+                return nil, ErrHashTooShort
+        }
+        p := new(hashed)
+        n, err := p.decodeVersion(hashedSecret)
+        if err != nil {
+                return nil, err
+        }
+        hashedSecret = hashedSecret[n:]
+        n, err = p.decodeCost(hashedSecret)
+        if err != nil {
+                return nil, err
+        }
+        hashedSecret = hashedSecret[n:]
+
+        // The "+2" is here because we'll have to append at most 2 '=' to the salt
+        // when base64 decoding it in expensiveBlowfishSetup().
+        p.salt = make([]byte, encodedSaltSize, encodedSaltSize+2)
+        copy(p.salt, hashedSecret[:encodedSaltSize])
+
+        hashedSecret = hashedSecret[encodedSaltSize:]
+        p.hash = make([]byte, len(hashedSecret))
+        copy(p.hash, hashedSecret)
+
+        return p, nil
+}
+
+func bcrypt(password []byte, cost int, salt []byte) ([]byte, error) {
+        cipherData := make([]byte, len(magicCipherData))
+        copy(cipherData, magicCipherData)
+
+        c, err := expensiveBlowfishSetup(password, uint32(cost), salt)
+        if err != nil {
+                return nil, err
+        }
+
+        for i := 0; i < 24; i += 8 {
+                for j := 0; j < 64; j++ {
+                        c.Encrypt(cipherData[i:i+8], cipherData[i:i+8])
+                }
+        }
+
+        // Bug compatibility with C bcrypt implementations. We only encode 23 of
+        // the 24 bytes encrypted.
+        hsh := base64Encode(cipherData[:maxCryptedHashSize])
+        return hsh, nil
+}
+
+func expensiveBlowfishSetup(key []byte, cost uint32, salt []byte) (*blowfish.Cipher, error) {
+
+        csalt, err := base64Decode(salt)
+        if err != nil {
+                return nil, err
+        }
+
+        // Bug compatibility with C bcrypt implementations. They use the trailing
+        // NULL in the key string during expansion.
+        ckey := append(key, 0)
+
+        c, err := blowfish.NewSaltedCipher(ckey, csalt)
+        if err != nil {
+                return nil, err
+        }
+
+        var i, rounds uint64
+        rounds = 1 << cost
+        for i = 0; i < rounds; i++ {
+                blowfish.ExpandKey(ckey, c)
+                blowfish.ExpandKey(csalt, c)
+        }
+
+        return c, nil
+}
+
+func (p *hashed) Hash() []byte {
+        arr := make([]byte, 60)
+        arr[0] = '$'
+        arr[1] = p.major
+        n := 2
+        if p.minor != 0 {
+                arr[2] = p.minor
+                n = 3
+        }
+        arr[n] = '$'
+        n += 1
+        copy(arr[n:], []byte(fmt.Sprintf("%02d", p.cost)))
+        n += 2
+        arr[n] = '$'
+        n += 1
+        copy(arr[n:], p.salt)
+        n += encodedSaltSize
+        copy(arr[n:], p.hash)
+        n += encodedHashSize
+        return arr[:n]
+}
+
+func (p *hashed) decodeVersion(sbytes []byte) (int, error) {
+        if sbytes[0] != '$' {
+                return -1, InvalidHashPrefixError(sbytes[0])
+        }
+        if sbytes[1] > majorVersion {
+                return -1, HashVersionTooNewError(sbytes[1])
+        }
+        p.major = sbytes[1]
+        n := 3
+        if sbytes[2] != '$' {
+                p.minor = sbytes[2]
+                n++
+        }
+        return n, nil
+}
+
+// sbytes should begin where decodeVersion left off.
+func (p *hashed) decodeCost(sbytes []byte) (int, error) {
+        cost, err := strconv.Atoi(string(sbytes[0:2]))
+        if err != nil {
+                return -1, err
+        }
+        err = checkCost(cost)
+        if err != nil {
+                return -1, err
+        }
+        p.cost = cost
+        return 3, nil
+}
+
+func (p *hashed) String() string {
+        return fmt.Sprintf("&{hash: %#v, salt: %#v, cost: %d, major: %c, minor: %c}", string(p.hash), p.salt, p.cost, p.major, p.minor)
+}
+
+func checkCost(cost int) error {
+        if cost < MinCost || cost > MaxCost {
+                return InvalidCostError(cost)
+        }
+        return nil
+}
diff --git a/vendor/golang.org/x/crypto/blowfish/block.go b/vendor/golang.org/x/crypto/blowfish/block.go
new file mode 100644
index 0000000..9d80f19
--- /dev/null
+++ b/vendor/golang.org/x/crypto/blowfish/block.go
@@ -0,0 +1,159 @@
+// 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 blowfish
+
+// getNextWord returns the next big-endian uint32 value from the byte slice
+// at the given position in a circular manner, updating the position.
+func getNextWord(b []byte, pos *int) uint32 {
+        var w uint32
+        j := *pos
+        for i := 0; i < 4; i++ {
+                w = w<<8 | uint32(b[j])
+                j++
+                if j >= len(b) {
+                        j = 0
+                }
+        }
+        *pos = j
+        return w
+}
+
+// ExpandKey performs a key expansion on the given *Cipher. Specifically, it
+// performs the Blowfish algorithm's key schedule which sets up the *Cipher's
+// pi and substitution tables for calls to Encrypt. This is used, primarily,
+// by the bcrypt package to reuse the Blowfish key schedule during its
+// set up. It's unlikely that you need to use this directly.
+func ExpandKey(key []byte, c *Cipher) {
+        j := 0
+        for i := 0; i < 18; i++ {
+                // Using inlined getNextWord for performance.
+                var d uint32
+                for k := 0; k < 4; k++ {
+                        d = d<<8 | uint32(key[j])
+                        j++
+                        if j >= len(key) {
+                                j = 0
+                        }
+                }
+                c.p[i] ^= d
+        }
+
+        var l, r uint32
+        for i := 0; i < 18; i += 2 {
+                l, r = encryptBlock(l, r, c)
+                c.p[i], c.p[i+1] = l, r
+        }
+
+        for i := 0; i < 256; i += 2 {
+                l, r = encryptBlock(l, r, c)
+                c.s0[i], c.s0[i+1] = l, r
+        }
+        for i := 0; i < 256; i += 2 {
+                l, r = encryptBlock(l, r, c)
+                c.s1[i], c.s1[i+1] = l, r
+        }
+        for i := 0; i < 256; i += 2 {
+                l, r = encryptBlock(l, r, c)
+                c.s2[i], c.s2[i+1] = l, r
+        }
+        for i := 0; i < 256; i += 2 {
+                l, r = encryptBlock(l, r, c)
+                c.s3[i], c.s3[i+1] = l, r
+        }
+}
+
+// This is similar to ExpandKey, but folds the salt during the key
+// schedule. While ExpandKey is essentially expandKeyWithSalt with an all-zero
+// salt passed in, reusing ExpandKey turns out to be a place of inefficiency
+// and specializing it here is useful.
+func expandKeyWithSalt(key []byte, salt []byte, c *Cipher) {
+        j := 0
+        for i := 0; i < 18; i++ {
+                c.p[i] ^= getNextWord(key, &j)
+        }
+
+        j = 0
+        var l, r uint32
+        for i := 0; i < 18; i += 2 {
+                l ^= getNextWord(salt, &j)
+                r ^= getNextWord(salt, &j)
+                l, r = encryptBlock(l, r, c)
+                c.p[i], c.p[i+1] = l, r
+        }
+
+        for i := 0; i < 256; i += 2 {
+                l ^= getNextWord(salt, &j)
+                r ^= getNextWord(salt, &j)
+                l, r = encryptBlock(l, r, c)
+                c.s0[i], c.s0[i+1] = l, r
+        }
+
+        for i := 0; i < 256; i += 2 {
+                l ^= getNextWord(salt, &j)
+                r ^= getNextWord(salt, &j)
+                l, r = encryptBlock(l, r, c)
+                c.s1[i], c.s1[i+1] = l, r
+        }
+
+        for i := 0; i < 256; i += 2 {
+                l ^= getNextWord(salt, &j)
+                r ^= getNextWord(salt, &j)
+                l, r = encryptBlock(l, r, c)
+                c.s2[i], c.s2[i+1] = l, r
+        }
+
+        for i := 0; i < 256; i += 2 {
+                l ^= getNextWord(salt, &j)
+                r ^= getNextWord(salt, &j)
+                l, r = encryptBlock(l, r, c)
+                c.s3[i], c.s3[i+1] = l, r
+        }
+}
+
+func encryptBlock(l, r uint32, c *Cipher) (uint32, uint32) {
+        xl, xr := l, r
+        xl ^= c.p[0]
+        xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[1]
+        xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[2]
+        xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[3]
+        xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[4]
+        xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[5]
+        xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[6]
+        xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[7]
+        xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[8]
+        xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[9]
+        xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[10]
+        xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[11]
+        xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[12]
+        xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[13]
+        xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[14]
+        xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[15]
+        xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[16]
+        xr ^= c.p[17]
+        return xr, xl
+}
+
+func decryptBlock(l, r uint32, c *Cipher) (uint32, uint32) {
+        xl, xr := l, r
+        xl ^= c.p[17]
+        xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[16]
+        xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[15]
+        xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[14]
+        xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[13]
+        xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[12]
+        xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[11]
+        xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[10]
+        xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[9]
+        xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[8]
+        xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[7]
+        xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[6]
+        xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[5]
+        xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[4]
+        xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[3]
+        xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[2]
+        xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[1]
+        xr ^= c.p[0]
+        return xr, xl
+}
diff --git a/vendor/golang.org/x/crypto/blowfish/cipher.go b/vendor/golang.org/x/crypto/blowfish/cipher.go
new file mode 100644
index 0000000..a73954f
--- /dev/null
+++ b/vendor/golang.org/x/crypto/blowfish/cipher.go
@@ -0,0 +1,91 @@
+// 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 blowfish implements Bruce Schneier's Blowfish encryption algorithm.
+package blowfish // import "golang.org/x/crypto/blowfish"
+
+// The code is a port of Bruce Schneier's C implementation.
+// See http://www.schneier.com/blowfish.html.
+
+import "strconv"
+
+// The Blowfish block size in bytes.
+const BlockSize = 8
+
+// A Cipher is an instance of Blowfish encryption using a particular key.
+type Cipher struct {
+        p              [18]uint32
+        s0, s1, s2, s3 [256]uint32
+}
+
+type KeySizeError int
+
+func (k KeySizeError) Error() string {
+        return "crypto/blowfish: invalid key size " + strconv.Itoa(int(k))
+}
+
+// NewCipher creates and returns a Cipher.
+// The key argument should be the Blowfish key, from 1 to 56 bytes.
+func NewCipher(key []byte) (*Cipher, error) {
+        var result Cipher
+        if k := len(key); k < 1 || k > 56 {
+                return nil, KeySizeError(k)
+        }
+        initCipher(&result)
+        ExpandKey(key, &result)
+        return &result, nil
+}
+
+// NewSaltedCipher creates a returns a Cipher that folds a salt into its key
+// schedule. For most purposes, NewCipher, instead of NewSaltedCipher, is
+// sufficient and desirable. For bcrypt compatibility, the key can be over 56
+// bytes.
+func NewSaltedCipher(key, salt []byte) (*Cipher, error) {
+        if len(salt) == 0 {
+                return NewCipher(key)
+        }
+        var result Cipher
+        if k := len(key); k < 1 {
+                return nil, KeySizeError(k)
+        }
+        initCipher(&result)
+        expandKeyWithSalt(key, salt, &result)
+        return &result, nil
+}
+
+// BlockSize returns the Blowfish block size, 8 bytes.
+// It is necessary to satisfy the Block interface in the
+// package "crypto/cipher".
+func (c *Cipher) BlockSize() int { return BlockSize }
+
+// Encrypt encrypts the 8-byte buffer src using the key k
+// and stores the result in dst.
+// Note that for amounts of data larger than a block,
+// it is not safe to just call Encrypt on successive blocks;
+// instead, use an encryption mode like CBC (see crypto/cipher/cbc.go).
+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 = encryptBlock(l, r, c)
+        dst[0], dst[1], dst[2], dst[3] = byte(l>>24), byte(l>>16), byte(l>>8), byte(l)
+        dst[4], dst[5], dst[6], dst[7] = byte(r>>24), byte(r>>16), byte(r>>8), byte(r)
+}
+
+// Decrypt decrypts the 8-byte buffer src using the key k
+// and stores the result in dst.
+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 = decryptBlock(l, r, c)
+        dst[0], dst[1], dst[2], dst[3] = byte(l>>24), byte(l>>16), byte(l>>8), byte(l)
+        dst[4], dst[5], dst[6], dst[7] = byte(r>>24), byte(r>>16), byte(r>>8), byte(r)
+}
+
+func initCipher(c *Cipher) {
+        copy(c.p[0:], p[0:])
+        copy(c.s0[0:], s0[0:])
+        copy(c.s1[0:], s1[0:])
+        copy(c.s2[0:], s2[0:])
+        copy(c.s3[0:], s3[0:])
+}
diff --git a/vendor/golang.org/x/crypto/blowfish/const.go b/vendor/golang.org/x/crypto/blowfish/const.go
new file mode 100644
index 0000000..8c5ee4c
--- /dev/null
+++ b/vendor/golang.org/x/crypto/blowfish/const.go
@@ -0,0 +1,199 @@
+// 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.
+
+// The startup permutation array and substitution boxes.
+// They are the hexadecimal digits of PI; see:
+// http://www.schneier.com/code/constants.txt.
+
+package blowfish
+
+var s0 = [256]uint32{
+        0xd1310ba6, 0x98dfb5ac, 0x2ffd72db, 0xd01adfb7, 0xb8e1afed, 0x6a267e96,
+        0xba7c9045, 0xf12c7f99, 0x24a19947, 0xb3916cf7, 0x0801f2e2, 0x858efc16,
+        0x636920d8, 0x71574e69, 0xa458fea3, 0xf4933d7e, 0x0d95748f, 0x728eb658,
+        0x718bcd58, 0x82154aee, 0x7b54a41d, 0xc25a59b5, 0x9c30d539, 0x2af26013,
+        0xc5d1b023, 0x286085f0, 0xca417918, 0xb8db38ef, 0x8e79dcb0, 0x603a180e,
+        0x6c9e0e8b, 0xb01e8a3e, 0xd71577c1, 0xbd314b27, 0x78af2fda, 0x55605c60,
+        0xe65525f3, 0xaa55ab94, 0x57489862, 0x63e81440, 0x55ca396a, 0x2aab10b6,
+        0xb4cc5c34, 0x1141e8ce, 0xa15486af, 0x7c72e993, 0xb3ee1411, 0x636fbc2a,
+        0x2ba9c55d, 0x741831f6, 0xce5c3e16, 0x9b87931e, 0xafd6ba33, 0x6c24cf5c,
+        0x7a325381, 0x28958677, 0x3b8f4898, 0x6b4bb9af, 0xc4bfe81b, 0x66282193,
+        0x61d809cc, 0xfb21a991, 0x487cac60, 0x5dec8032, 0xef845d5d, 0xe98575b1,
+        0xdc262302, 0xeb651b88, 0x23893e81, 0xd396acc5, 0x0f6d6ff3, 0x83f44239,
+        0x2e0b4482, 0xa4842004, 0x69c8f04a, 0x9e1f9b5e, 0x21c66842, 0xf6e96c9a,
+        0x670c9c61, 0xabd388f0, 0x6a51a0d2, 0xd8542f68, 0x960fa728, 0xab5133a3,
+        0x6eef0b6c, 0x137a3be4, 0xba3bf050, 0x7efb2a98, 0xa1f1651d, 0x39af0176,
+        0x66ca593e, 0x82430e88, 0x8cee8619, 0x456f9fb4, 0x7d84a5c3, 0x3b8b5ebe,
+        0xe06f75d8, 0x85c12073, 0x401a449f, 0x56c16aa6, 0x4ed3aa62, 0x363f7706,
+        0x1bfedf72, 0x429b023d, 0x37d0d724, 0xd00a1248, 0xdb0fead3, 0x49f1c09b,
+        0x075372c9, 0x80991b7b, 0x25d479d8, 0xf6e8def7, 0xe3fe501a, 0xb6794c3b,
+        0x976ce0bd, 0x04c006ba, 0xc1a94fb6, 0x409f60c4, 0x5e5c9ec2, 0x196a2463,
+        0x68fb6faf, 0x3e6c53b5, 0x1339b2eb, 0x3b52ec6f, 0x6dfc511f, 0x9b30952c,
+        0xcc814544, 0xaf5ebd09, 0xbee3d004, 0xde334afd, 0x660f2807, 0x192e4bb3,
+        0xc0cba857, 0x45c8740f, 0xd20b5f39, 0xb9d3fbdb, 0x5579c0bd, 0x1a60320a,
+        0xd6a100c6, 0x402c7279, 0x679f25fe, 0xfb1fa3cc, 0x8ea5e9f8, 0xdb3222f8,
+        0x3c7516df, 0xfd616b15, 0x2f501ec8, 0xad0552ab, 0x323db5fa, 0xfd238760,
+        0x53317b48, 0x3e00df82, 0x9e5c57bb, 0xca6f8ca0, 0x1a87562e, 0xdf1769db,
+        0xd542a8f6, 0x287effc3, 0xac6732c6, 0x8c4f5573, 0x695b27b0, 0xbbca58c8,
+        0xe1ffa35d, 0xb8f011a0, 0x10fa3d98, 0xfd2183b8, 0x4afcb56c, 0x2dd1d35b,
+        0x9a53e479, 0xb6f84565, 0xd28e49bc, 0x4bfb9790, 0xe1ddf2da, 0xa4cb7e33,
+        0x62fb1341, 0xcee4c6e8, 0xef20cada, 0x36774c01, 0xd07e9efe, 0x2bf11fb4,
+        0x95dbda4d, 0xae909198, 0xeaad8e71, 0x6b93d5a0, 0xd08ed1d0, 0xafc725e0,
+        0x8e3c5b2f, 0x8e7594b7, 0x8ff6e2fb, 0xf2122b64, 0x8888b812, 0x900df01c,
+        0x4fad5ea0, 0x688fc31c, 0xd1cff191, 0xb3a8c1ad, 0x2f2f2218, 0xbe0e1777,
+        0xea752dfe, 0x8b021fa1, 0xe5a0cc0f, 0xb56f74e8, 0x18acf3d6, 0xce89e299,
+        0xb4a84fe0, 0xfd13e0b7, 0x7cc43b81, 0xd2ada8d9, 0x165fa266, 0x80957705,
+        0x93cc7314, 0x211a1477, 0xe6ad2065, 0x77b5fa86, 0xc75442f5, 0xfb9d35cf,
+        0xebcdaf0c, 0x7b3e89a0, 0xd6411bd3, 0xae1e7e49, 0x00250e2d, 0x2071b35e,
+        0x226800bb, 0x57b8e0af, 0x2464369b, 0xf009b91e, 0x5563911d, 0x59dfa6aa,
+        0x78c14389, 0xd95a537f, 0x207d5ba2, 0x02e5b9c5, 0x83260376, 0x6295cfa9,
+        0x11c81968, 0x4e734a41, 0xb3472dca, 0x7b14a94a, 0x1b510052, 0x9a532915,
+        0xd60f573f, 0xbc9bc6e4, 0x2b60a476, 0x81e67400, 0x08ba6fb5, 0x571be91f,
+        0xf296ec6b, 0x2a0dd915, 0xb6636521, 0xe7b9f9b6, 0xff34052e, 0xc5855664,
+        0x53b02d5d, 0xa99f8fa1, 0x08ba4799, 0x6e85076a,
+}
+
+var s1 = [256]uint32{
+        0x4b7a70e9, 0xb5b32944, 0xdb75092e, 0xc4192623, 0xad6ea6b0, 0x49a7df7d,
+        0x9cee60b8, 0x8fedb266, 0xecaa8c71, 0x699a17ff, 0x5664526c, 0xc2b19ee1,
+        0x193602a5, 0x75094c29, 0xa0591340, 0xe4183a3e, 0x3f54989a, 0x5b429d65,
+        0x6b8fe4d6, 0x99f73fd6, 0xa1d29c07, 0xefe830f5, 0x4d2d38e6, 0xf0255dc1,
+        0x4cdd2086, 0x8470eb26, 0x6382e9c6, 0x021ecc5e, 0x09686b3f, 0x3ebaefc9,
+        0x3c971814, 0x6b6a70a1, 0x687f3584, 0x52a0e286, 0xb79c5305, 0xaa500737,
+        0x3e07841c, 0x7fdeae5c, 0x8e7d44ec, 0x5716f2b8, 0xb03ada37, 0xf0500c0d,
+        0xf01c1f04, 0x0200b3ff, 0xae0cf51a, 0x3cb574b2, 0x25837a58, 0xdc0921bd,
+        0xd19113f9, 0x7ca92ff6, 0x94324773, 0x22f54701, 0x3ae5e581, 0x37c2dadc,
+        0xc8b57634, 0x9af3dda7, 0xa9446146, 0x0fd0030e, 0xecc8c73e, 0xa4751e41,
+        0xe238cd99, 0x3bea0e2f, 0x3280bba1, 0x183eb331, 0x4e548b38, 0x4f6db908,
+        0x6f420d03, 0xf60a04bf, 0x2cb81290, 0x24977c79, 0x5679b072, 0xbcaf89af,
+        0xde9a771f, 0xd9930810, 0xb38bae12, 0xdccf3f2e, 0x5512721f, 0x2e6b7124,
+        0x501adde6, 0x9f84cd87, 0x7a584718, 0x7408da17, 0xbc9f9abc, 0xe94b7d8c,
+        0xec7aec3a, 0xdb851dfa, 0x63094366, 0xc464c3d2, 0xef1c1847, 0x3215d908,
+        0xdd433b37, 0x24c2ba16, 0x12a14d43, 0x2a65c451, 0x50940002, 0x133ae4dd,
+        0x71dff89e, 0x10314e55, 0x81ac77d6, 0x5f11199b, 0x043556f1, 0xd7a3c76b,
+        0x3c11183b, 0x5924a509, 0xf28fe6ed, 0x97f1fbfa, 0x9ebabf2c, 0x1e153c6e,
+        0x86e34570, 0xeae96fb1, 0x860e5e0a, 0x5a3e2ab3, 0x771fe71c, 0x4e3d06fa,
+        0x2965dcb9, 0x99e71d0f, 0x803e89d6, 0x5266c825, 0x2e4cc978, 0x9c10b36a,
+        0xc6150eba, 0x94e2ea78, 0xa5fc3c53, 0x1e0a2df4, 0xf2f74ea7, 0x361d2b3d,
+        0x1939260f, 0x19c27960, 0x5223a708, 0xf71312b6, 0xebadfe6e, 0xeac31f66,
+        0xe3bc4595, 0xa67bc883, 0xb17f37d1, 0x018cff28, 0xc332ddef, 0xbe6c5aa5,
+        0x65582185, 0x68ab9802, 0xeecea50f, 0xdb2f953b, 0x2aef7dad, 0x5b6e2f84,
+        0x1521b628, 0x29076170, 0xecdd4775, 0x619f1510, 0x13cca830, 0xeb61bd96,
+        0x0334fe1e, 0xaa0363cf, 0xb5735c90, 0x4c70a239, 0xd59e9e0b, 0xcbaade14,
+        0xeecc86bc, 0x60622ca7, 0x9cab5cab, 0xb2f3846e, 0x648b1eaf, 0x19bdf0ca,
+        0xa02369b9, 0x655abb50, 0x40685a32, 0x3c2ab4b3, 0x319ee9d5, 0xc021b8f7,
+        0x9b540b19, 0x875fa099, 0x95f7997e, 0x623d7da8, 0xf837889a, 0x97e32d77,
+        0x11ed935f, 0x16681281, 0x0e358829, 0xc7e61fd6, 0x96dedfa1, 0x7858ba99,
+        0x57f584a5, 0x1b227263, 0x9b83c3ff, 0x1ac24696, 0xcdb30aeb, 0x532e3054,
+        0x8fd948e4, 0x6dbc3128, 0x58ebf2ef, 0x34c6ffea, 0xfe28ed61, 0xee7c3c73,
+        0x5d4a14d9, 0xe864b7e3, 0x42105d14, 0x203e13e0, 0x45eee2b6, 0xa3aaabea,
+        0xdb6c4f15, 0xfacb4fd0, 0xc742f442, 0xef6abbb5, 0x654f3b1d, 0x41cd2105,
+        0xd81e799e, 0x86854dc7, 0xe44b476a, 0x3d816250, 0xcf62a1f2, 0x5b8d2646,
+        0xfc8883a0, 0xc1c7b6a3, 0x7f1524c3, 0x69cb7492, 0x47848a0b, 0x5692b285,
+        0x095bbf00, 0xad19489d, 0x1462b174, 0x23820e00, 0x58428d2a, 0x0c55f5ea,
+        0x1dadf43e, 0x233f7061, 0x3372f092, 0x8d937e41, 0xd65fecf1, 0x6c223bdb,
+        0x7cde3759, 0xcbee7460, 0x4085f2a7, 0xce77326e, 0xa6078084, 0x19f8509e,
+        0xe8efd855, 0x61d99735, 0xa969a7aa, 0xc50c06c2, 0x5a04abfc, 0x800bcadc,
+        0x9e447a2e, 0xc3453484, 0xfdd56705, 0x0e1e9ec9, 0xdb73dbd3, 0x105588cd,
+        0x675fda79, 0xe3674340, 0xc5c43465, 0x713e38d8, 0x3d28f89e, 0xf16dff20,
+        0x153e21e7, 0x8fb03d4a, 0xe6e39f2b, 0xdb83adf7,
+}
+
+var s2 = [256]uint32{
+        0xe93d5a68, 0x948140f7, 0xf64c261c, 0x94692934, 0x411520f7, 0x7602d4f7,
+        0xbcf46b2e, 0xd4a20068, 0xd4082471, 0x3320f46a, 0x43b7d4b7, 0x500061af,
+        0x1e39f62e, 0x97244546, 0x14214f74, 0xbf8b8840, 0x4d95fc1d, 0x96b591af,
+        0x70f4ddd3, 0x66a02f45, 0xbfbc09ec, 0x03bd9785, 0x7fac6dd0, 0x31cb8504,
+        0x96eb27b3, 0x55fd3941, 0xda2547e6, 0xabca0a9a, 0x28507825, 0x530429f4,
+        0x0a2c86da, 0xe9b66dfb, 0x68dc1462, 0xd7486900, 0x680ec0a4, 0x27a18dee,
+        0x4f3ffea2, 0xe887ad8c, 0xb58ce006, 0x7af4d6b6, 0xaace1e7c, 0xd3375fec,
+        0xce78a399, 0x406b2a42, 0x20fe9e35, 0xd9f385b9, 0xee39d7ab, 0x3b124e8b,
+        0x1dc9faf7, 0x4b6d1856, 0x26a36631, 0xeae397b2, 0x3a6efa74, 0xdd5b4332,
+        0x6841e7f7, 0xca7820fb, 0xfb0af54e, 0xd8feb397, 0x454056ac, 0xba489527,
+        0x55533a3a, 0x20838d87, 0xfe6ba9b7, 0xd096954b, 0x55a867bc, 0xa1159a58,
+        0xcca92963, 0x99e1db33, 0xa62a4a56, 0x3f3125f9, 0x5ef47e1c, 0x9029317c,
+        0xfdf8e802, 0x04272f70, 0x80bb155c, 0x05282ce3, 0x95c11548, 0xe4c66d22,
+        0x48c1133f, 0xc70f86dc, 0x07f9c9ee, 0x41041f0f, 0x404779a4, 0x5d886e17,
+        0x325f51eb, 0xd59bc0d1, 0xf2bcc18f, 0x41113564, 0x257b7834, 0x602a9c60,
+        0xdff8e8a3, 0x1f636c1b, 0x0e12b4c2, 0x02e1329e, 0xaf664fd1, 0xcad18115,
+        0x6b2395e0, 0x333e92e1, 0x3b240b62, 0xeebeb922, 0x85b2a20e, 0xe6ba0d99,
+        0xde720c8c, 0x2da2f728, 0xd0127845, 0x95b794fd, 0x647d0862, 0xe7ccf5f0,
+        0x5449a36f, 0x877d48fa, 0xc39dfd27, 0xf33e8d1e, 0x0a476341, 0x992eff74,
+        0x3a6f6eab, 0xf4f8fd37, 0xa812dc60, 0xa1ebddf8, 0x991be14c, 0xdb6e6b0d,
+        0xc67b5510, 0x6d672c37, 0x2765d43b, 0xdcd0e804, 0xf1290dc7, 0xcc00ffa3,
+        0xb5390f92, 0x690fed0b, 0x667b9ffb, 0xcedb7d9c, 0xa091cf0b, 0xd9155ea3,
+        0xbb132f88, 0x515bad24, 0x7b9479bf, 0x763bd6eb, 0x37392eb3, 0xcc115979,
+        0x8026e297, 0xf42e312d, 0x6842ada7, 0xc66a2b3b, 0x12754ccc, 0x782ef11c,
+        0x6a124237, 0xb79251e7, 0x06a1bbe6, 0x4bfb6350, 0x1a6b1018, 0x11caedfa,
+        0x3d25bdd8, 0xe2e1c3c9, 0x44421659, 0x0a121386, 0xd90cec6e, 0xd5abea2a,
+        0x64af674e, 0xda86a85f, 0xbebfe988, 0x64e4c3fe, 0x9dbc8057, 0xf0f7c086,
+        0x60787bf8, 0x6003604d, 0xd1fd8346, 0xf6381fb0, 0x7745ae04, 0xd736fccc,
+        0x83426b33, 0xf01eab71, 0xb0804187, 0x3c005e5f, 0x77a057be, 0xbde8ae24,
+        0x55464299, 0xbf582e61, 0x4e58f48f, 0xf2ddfda2, 0xf474ef38, 0x8789bdc2,
+        0x5366f9c3, 0xc8b38e74, 0xb475f255, 0x46fcd9b9, 0x7aeb2661, 0x8b1ddf84,
+        0x846a0e79, 0x915f95e2, 0x466e598e, 0x20b45770, 0x8cd55591, 0xc902de4c,
+        0xb90bace1, 0xbb8205d0, 0x11a86248, 0x7574a99e, 0xb77f19b6, 0xe0a9dc09,
+        0x662d09a1, 0xc4324633, 0xe85a1f02, 0x09f0be8c, 0x4a99a025, 0x1d6efe10,
+        0x1ab93d1d, 0x0ba5a4df, 0xa186f20f, 0x2868f169, 0xdcb7da83, 0x573906fe,
+        0xa1e2ce9b, 0x4fcd7f52, 0x50115e01, 0xa70683fa, 0xa002b5c4, 0x0de6d027,
+        0x9af88c27, 0x773f8641, 0xc3604c06, 0x61a806b5, 0xf0177a28, 0xc0f586e0,
+        0x006058aa, 0x30dc7d62, 0x11e69ed7, 0x2338ea63, 0x53c2dd94, 0xc2c21634,
+        0xbbcbee56, 0x90bcb6de, 0xebfc7da1, 0xce591d76, 0x6f05e409, 0x4b7c0188,
+        0x39720a3d, 0x7c927c24, 0x86e3725f, 0x724d9db9, 0x1ac15bb4, 0xd39eb8fc,
+        0xed545578, 0x08fca5b5, 0xd83d7cd3, 0x4dad0fc4, 0x1e50ef5e, 0xb161e6f8,
+        0xa28514d9, 0x6c51133c, 0x6fd5c7e7, 0x56e14ec4, 0x362abfce, 0xddc6c837,
+        0xd79a3234, 0x92638212, 0x670efa8e, 0x406000e0,
+}
+
+var s3 = [256]uint32{
+        0x3a39ce37, 0xd3faf5cf, 0xabc27737, 0x5ac52d1b, 0x5cb0679e, 0x4fa33742,
+        0xd3822740, 0x99bc9bbe, 0xd5118e9d, 0xbf0f7315, 0xd62d1c7e, 0xc700c47b,
+        0xb78c1b6b, 0x21a19045, 0xb26eb1be, 0x6a366eb4, 0x5748ab2f, 0xbc946e79,
+        0xc6a376d2, 0x6549c2c8, 0x530ff8ee, 0x468dde7d, 0xd5730a1d, 0x4cd04dc6,
+        0x2939bbdb, 0xa9ba4650, 0xac9526e8, 0xbe5ee304, 0xa1fad5f0, 0x6a2d519a,
+        0x63ef8ce2, 0x9a86ee22, 0xc089c2b8, 0x43242ef6, 0xa51e03aa, 0x9cf2d0a4,
+        0x83c061ba, 0x9be96a4d, 0x8fe51550, 0xba645bd6, 0x2826a2f9, 0xa73a3ae1,
+        0x4ba99586, 0xef5562e9, 0xc72fefd3, 0xf752f7da, 0x3f046f69, 0x77fa0a59,
+        0x80e4a915, 0x87b08601, 0x9b09e6ad, 0x3b3ee593, 0xe990fd5a, 0x9e34d797,
+        0x2cf0b7d9, 0x022b8b51, 0x96d5ac3a, 0x017da67d, 0xd1cf3ed6, 0x7c7d2d28,
+        0x1f9f25cf, 0xadf2b89b, 0x5ad6b472, 0x5a88f54c, 0xe029ac71, 0xe019a5e6,
+        0x47b0acfd, 0xed93fa9b, 0xe8d3c48d, 0x283b57cc, 0xf8d56629, 0x79132e28,
+        0x785f0191, 0xed756055, 0xf7960e44, 0xe3d35e8c, 0x15056dd4, 0x88f46dba,
+        0x03a16125, 0x0564f0bd, 0xc3eb9e15, 0x3c9057a2, 0x97271aec, 0xa93a072a,
+        0x1b3f6d9b, 0x1e6321f5, 0xf59c66fb, 0x26dcf319, 0x7533d928, 0xb155fdf5,
+        0x03563482, 0x8aba3cbb, 0x28517711, 0xc20ad9f8, 0xabcc5167, 0xccad925f,
+        0x4de81751, 0x3830dc8e, 0x379d5862, 0x9320f991, 0xea7a90c2, 0xfb3e7bce,
+        0x5121ce64, 0x774fbe32, 0xa8b6e37e, 0xc3293d46, 0x48de5369, 0x6413e680,
+        0xa2ae0810, 0xdd6db224, 0x69852dfd, 0x09072166, 0xb39a460a, 0x6445c0dd,
+        0x586cdecf, 0x1c20c8ae, 0x5bbef7dd, 0x1b588d40, 0xccd2017f, 0x6bb4e3bb,
+        0xdda26a7e, 0x3a59ff45, 0x3e350a44, 0xbcb4cdd5, 0x72eacea8, 0xfa6484bb,
+        0x8d6612ae, 0xbf3c6f47, 0xd29be463, 0x542f5d9e, 0xaec2771b, 0xf64e6370,
+        0x740e0d8d, 0xe75b1357, 0xf8721671, 0xaf537d5d, 0x4040cb08, 0x4eb4e2cc,
+        0x34d2466a, 0x0115af84, 0xe1b00428, 0x95983a1d, 0x06b89fb4, 0xce6ea048,
+        0x6f3f3b82, 0x3520ab82, 0x011a1d4b, 0x277227f8, 0x611560b1, 0xe7933fdc,
+        0xbb3a792b, 0x344525bd, 0xa08839e1, 0x51ce794b, 0x2f32c9b7, 0xa01fbac9,
+        0xe01cc87e, 0xbcc7d1f6, 0xcf0111c3, 0xa1e8aac7, 0x1a908749, 0xd44fbd9a,
+        0xd0dadecb, 0xd50ada38, 0x0339c32a, 0xc6913667, 0x8df9317c, 0xe0b12b4f,
+        0xf79e59b7, 0x43f5bb3a, 0xf2d519ff, 0x27d9459c, 0xbf97222c, 0x15e6fc2a,
+        0x0f91fc71, 0x9b941525, 0xfae59361, 0xceb69ceb, 0xc2a86459, 0x12baa8d1,
+        0xb6c1075e, 0xe3056a0c, 0x10d25065, 0xcb03a442, 0xe0ec6e0e, 0x1698db3b,
+        0x4c98a0be, 0x3278e964, 0x9f1f9532, 0xe0d392df, 0xd3a0342b, 0x8971f21e,
+        0x1b0a7441, 0x4ba3348c, 0xc5be7120, 0xc37632d8, 0xdf359f8d, 0x9b992f2e,
+        0xe60b6f47, 0x0fe3f11d, 0xe54cda54, 0x1edad891, 0xce6279cf, 0xcd3e7e6f,
+        0x1618b166, 0xfd2c1d05, 0x848fd2c5, 0xf6fb2299, 0xf523f357, 0xa6327623,
+        0x93a83531, 0x56cccd02, 0xacf08162, 0x5a75ebb5, 0x6e163697, 0x88d273cc,
+        0xde966292, 0x81b949d0, 0x4c50901b, 0x71c65614, 0xe6c6c7bd, 0x327a140a,
+        0x45e1d006, 0xc3f27b9a, 0xc9aa53fd, 0x62a80f00, 0xbb25bfe2, 0x35bdd2f6,
+        0x71126905, 0xb2040222, 0xb6cbcf7c, 0xcd769c2b, 0x53113ec0, 0x1640e3d3,
+        0x38abbd60, 0x2547adf0, 0xba38209c, 0xf746ce76, 0x77afa1c5, 0x20756060,
+        0x85cbfe4e, 0x8ae88dd8, 0x7aaaf9b0, 0x4cf9aa7e, 0x1948c25c, 0x02fb8a8c,
+        0x01c36ae4, 0xd6ebe1f9, 0x90d4f869, 0xa65cdea0, 0x3f09252d, 0xc208e69f,
+        0xb74e6132, 0xce77e25b, 0x578fdfe3, 0x3ac372e6,
+}
+
+var p = [18]uint32{
+        0x243f6a88, 0x85a308d3, 0x13198a2e, 0x03707344, 0xa4093822, 0x299f31d0,
+        0x082efa98, 0xec4e6c89, 0x452821e6, 0x38d01377, 0xbe5466cf, 0x34e90c6c,
+        0xc0ac29b7, 0xc97c50dd, 0x3f84d5b5, 0xb5470917, 0x9216d5d9, 0x8979fb1b,
+}
diff --git a/vendor/golang.org/x/crypto/curve25519/const_amd64.h b/vendor/golang.org/x/crypto/curve25519/const_amd64.h
deleted file mode 100644
index 80ad222..0000000
--- a/vendor/golang.org/x/crypto/curve25519/const_amd64.h
+++ /dev/null
@@ -1,8 +0,0 @@
-// 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.
-
-// This code was translated into a form compatible with 6a from the public
-// domain sources in SUPERCOP: http://bench.cr.yp.to/supercop.html
-
-#define REDMASK51     0x0007FFFFFFFFFFFF
diff --git a/vendor/golang.org/x/crypto/curve25519/const_amd64.s b/vendor/golang.org/x/crypto/curve25519/const_amd64.s
deleted file mode 100644
index 0ad5398..0000000
--- a/vendor/golang.org/x/crypto/curve25519/const_amd64.s
+++ /dev/null
@@ -1,20 +0,0 @@
-// 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.
-
-// This code was translated into a form compatible with 6a from the public
-// domain sources in SUPERCOP: http://bench.cr.yp.to/supercop.html
-
-// +build amd64,!gccgo,!appengine
-
-// These constants cannot be encoded in non-MOVQ immediates.
-// We access them directly from memory instead.
-
-DATA ·_121666_213(SB)/8, $996687872
-GLOBL ·_121666_213(SB), 8, $8
-
-DATA ·_2P0(SB)/8, $0xFFFFFFFFFFFDA
-GLOBL ·_2P0(SB), 8, $8
-
-DATA ·_2P1234(SB)/8, $0xFFFFFFFFFFFFE
-GLOBL ·_2P1234(SB), 8, $8
diff --git a/vendor/golang.org/x/crypto/curve25519/cswap_amd64.s b/vendor/golang.org/x/crypto/curve25519/cswap_amd64.s
deleted file mode 100644
index 45484d1..0000000
--- a/vendor/golang.org/x/crypto/curve25519/cswap_amd64.s
+++ /dev/null
@@ -1,88 +0,0 @@
-// 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.
-
-// This code was translated into a form compatible with 6a from the public
-// domain sources in SUPERCOP: http://bench.cr.yp.to/supercop.html
-
-// +build amd64,!gccgo,!appengine
-
-// func cswap(inout *[5]uint64, v uint64)
-TEXT ·cswap(SB),7,$0
-        MOVQ inout+0(FP),DI
-        MOVQ v+8(FP),SI
-
-        CMPQ SI,$1
-        MOVQ 0(DI),SI
-        MOVQ 80(DI),DX
-        MOVQ 8(DI),CX
-        MOVQ 88(DI),R8
-        MOVQ SI,R9
-        CMOVQEQ DX,SI
-        CMOVQEQ R9,DX
-        MOVQ CX,R9
-        CMOVQEQ R8,CX
-        CMOVQEQ R9,R8
-        MOVQ SI,0(DI)
-        MOVQ DX,80(DI)
-        MOVQ CX,8(DI)
-        MOVQ R8,88(DI)
-        MOVQ 16(DI),SI
-        MOVQ 96(DI),DX
-        MOVQ 24(DI),CX
-        MOVQ 104(DI),R8
-        MOVQ SI,R9
-        CMOVQEQ DX,SI
-        CMOVQEQ R9,DX
-        MOVQ CX,R9
-        CMOVQEQ R8,CX
-        CMOVQEQ R9,R8
-        MOVQ SI,16(DI)
-        MOVQ DX,96(DI)
-        MOVQ CX,24(DI)
-        MOVQ R8,104(DI)
-        MOVQ 32(DI),SI
-        MOVQ 112(DI),DX
-        MOVQ 40(DI),CX
-        MOVQ 120(DI),R8
-        MOVQ SI,R9
-        CMOVQEQ DX,SI
-        CMOVQEQ R9,DX
-        MOVQ CX,R9
-        CMOVQEQ R8,CX
-        CMOVQEQ R9,R8
-        MOVQ SI,32(DI)
-        MOVQ DX,112(DI)
-        MOVQ CX,40(DI)
-        MOVQ R8,120(DI)
-        MOVQ 48(DI),SI
-        MOVQ 128(DI),DX
-        MOVQ 56(DI),CX
-        MOVQ 136(DI),R8
-        MOVQ SI,R9
-        CMOVQEQ DX,SI
-        CMOVQEQ R9,DX
-        MOVQ CX,R9
-        CMOVQEQ R8,CX
-        CMOVQEQ R9,R8
-        MOVQ SI,48(DI)
-        MOVQ DX,128(DI)
-        MOVQ CX,56(DI)
-        MOVQ R8,136(DI)
-        MOVQ 64(DI),SI
-        MOVQ 144(DI),DX
-        MOVQ 72(DI),CX
-        MOVQ 152(DI),R8
-        MOVQ SI,R9
-        CMOVQEQ DX,SI
-        CMOVQEQ R9,DX
-        MOVQ CX,R9
-        CMOVQEQ R8,CX
-        CMOVQEQ R9,R8
-        MOVQ SI,64(DI)
-        MOVQ DX,144(DI)
-        MOVQ CX,72(DI)
-        MOVQ R8,152(DI)
-        MOVQ DI,AX
-        MOVQ SI,DX
-        RET
diff --git a/vendor/golang.org/x/crypto/curve25519/curve25519.go b/vendor/golang.org/x/crypto/curve25519/curve25519.go
deleted file mode 100644
index 6918c47..0000000
--- a/vendor/golang.org/x/crypto/curve25519/curve25519.go
+++ /dev/null
@@ -1,841 +0,0 @@
-// 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.
-
-// We have a implementation in amd64 assembly so this code is only run on
-// non-amd64 platforms. The amd64 assembly does not support gccgo.
-// +build !amd64 gccgo appengine
-
-package curve25519
-
-// This code is a port of the public domain, "ref10" implementation of
-// curve25519 from SUPERCOP 20130419 by D. J. Bernstein.
-
-// fieldElement represents an element of the field GF(2^255 - 19). An element
-// t, entries t[0]...t[9], represents the integer t[0]+2^26 t[1]+2^51 t[2]+2^77
-// t[3]+2^102 t[4]+...+2^230 t[9]. Bounds on each t[i] vary depending on
-// context.
-type fieldElement [10]int32
-
-func feZero(fe *fieldElement) {
-        for i := range fe {
-                fe[i] = 0
-        }
-}
-
-func feOne(fe *fieldElement) {
-        feZero(fe)
-        fe[0] = 1
-}
-
-func feAdd(dst, a, b *fieldElement) {
-        for i := range dst {
-                dst[i] = a[i] + b[i]
-        }
-}
-
-func feSub(dst, a, b *fieldElement) {
-        for i := range dst {
-                dst[i] = a[i] - b[i]
-        }
-}
-
-func feCopy(dst, src *fieldElement) {
-        for i := range dst {
-                dst[i] = src[i]
-        }
-}
-
-// feCSwap replaces (f,g) with (g,f) if b == 1; replaces (f,g) with (f,g) if b == 0.
-//
-// Preconditions: b in {0,1}.
-func feCSwap(f, g *fieldElement, b int32) {
-        var x fieldElement
-        b = -b
-        for i := range x {
-                x[i] = b & (f[i] ^ g[i])
-        }
-
-        for i := range f {
-                f[i] ^= x[i]
-        }
-        for i := range g {
-                g[i] ^= x[i]
-        }
-}
-
-// load3 reads a 24-bit, little-endian value from in.
-func load3(in []byte) int64 {
-        var r int64
-        r = int64(in[0])
-        r |= int64(in[1]) << 8
-        r |= int64(in[2]) << 16
-        return r
-}
-
-// load4 reads a 32-bit, little-endian value from in.
-func load4(in []byte) int64 {
-        var r int64
-        r = int64(in[0])
-        r |= int64(in[1]) << 8
-        r |= int64(in[2]) << 16
-        r |= int64(in[3]) << 24
-        return r
-}
-
-func feFromBytes(dst *fieldElement, src *[32]byte) {
-        h0 := load4(src[:])
-        h1 := load3(src[4:]) << 6
-        h2 := load3(src[7:]) << 5
-        h3 := load3(src[10:]) << 3
-        h4 := load3(src[13:]) << 2
-        h5 := load4(src[16:])
-        h6 := load3(src[20:]) << 7
-        h7 := load3(src[23:]) << 5
-        h8 := load3(src[26:]) << 4
-        h9 := load3(src[29:]) << 2
-
-        var carry [10]int64
-        carry[9] = (h9 + 1<<24) >> 25
-        h0 += carry[9] * 19
-        h9 -= carry[9] << 25
-        carry[1] = (h1 + 1<<24) >> 25
-        h2 += carry[1]
-        h1 -= carry[1] << 25
-        carry[3] = (h3 + 1<<24) >> 25
-        h4 += carry[3]
-        h3 -= carry[3] << 25
-        carry[5] = (h5 + 1<<24) >> 25
-        h6 += carry[5]
-        h5 -= carry[5] << 25
-        carry[7] = (h7 + 1<<24) >> 25
-        h8 += carry[7]
-        h7 -= carry[7] << 25
-
-        carry[0] = (h0 + 1<<25) >> 26
-        h1 += carry[0]
-        h0 -= carry[0] << 26
-        carry[2] = (h2 + 1<<25) >> 26
-        h3 += carry[2]
-        h2 -= carry[2] << 26
-        carry[4] = (h4 + 1<<25) >> 26
-        h5 += carry[4]
-        h4 -= carry[4] << 26
-        carry[6] = (h6 + 1<<25) >> 26
-        h7 += carry[6]
-        h6 -= carry[6] << 26
-        carry[8] = (h8 + 1<<25) >> 26
-        h9 += carry[8]
-        h8 -= carry[8] << 26
-
-        dst[0] = int32(h0)
-        dst[1] = int32(h1)
-        dst[2] = int32(h2)
-        dst[3] = int32(h3)
-        dst[4] = int32(h4)
-        dst[5] = int32(h5)
-        dst[6] = int32(h6)
-        dst[7] = int32(h7)
-        dst[8] = int32(h8)
-        dst[9] = int32(h9)
-}
-
-// feToBytes marshals h to s.
-// Preconditions:
-//   |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
-//
-// Write p=2^255-19; q=floor(h/p).
-// Basic claim: q = floor(2^(-255)(h + 19 2^(-25)h9 + 2^(-1))).
-//
-// Proof:
-//   Have |h|<=p so |q|<=1 so |19^2 2^(-255) q|<1/4.
-//   Also have |h-2^230 h9|<2^230 so |19 2^(-255)(h-2^230 h9)|<1/4.
-//
-//   Write y=2^(-1)-19^2 2^(-255)q-19 2^(-255)(h-2^230 h9).
-//   Then 0<y<1.
-//
-//   Write r=h-pq.
-//   Have 0<=r<=p-1=2^255-20.
-//   Thus 0<=r+19(2^-255)r<r+19(2^-255)2^255<=2^255-1.
-//
-//   Write x=r+19(2^-255)r+y.
-//   Then 0<x<2^255 so floor(2^(-255)x) = 0 so floor(q+2^(-255)x) = q.
-//
-//   Have q+2^(-255)x = 2^(-255)(h + 19 2^(-25) h9 + 2^(-1))
-//   so floor(2^(-255)(h + 19 2^(-25) h9 + 2^(-1))) = q.
-func feToBytes(s *[32]byte, h *fieldElement) {
-        var carry [10]int32
-
-        q := (19*h[9] + (1 << 24)) >> 25
-        q = (h[0] + q) >> 26
-        q = (h[1] + q) >> 25
-        q = (h[2] + q) >> 26
-        q = (h[3] + q) >> 25
-        q = (h[4] + q) >> 26
-        q = (h[5] + q) >> 25
-        q = (h[6] + q) >> 26
-        q = (h[7] + q) >> 25
-        q = (h[8] + q) >> 26
-        q = (h[9] + q) >> 25
-
-        // Goal: Output h-(2^255-19)q, which is between 0 and 2^255-20.
-        h[0] += 19 * q
-        // Goal: Output h-2^255 q, which is between 0 and 2^255-20.
-
-        carry[0] = h[0] >> 26
-        h[1] += carry[0]
-        h[0] -= carry[0] << 26
-        carry[1] = h[1] >> 25
-        h[2] += carry[1]
-        h[1] -= carry[1] << 25
-        carry[2] = h[2] >> 26
-        h[3] += carry[2]
-        h[2] -= carry[2] << 26
-        carry[3] = h[3] >> 25
-        h[4] += carry[3]
-        h[3] -= carry[3] << 25
-        carry[4] = h[4] >> 26
-        h[5] += carry[4]
-        h[4] -= carry[4] << 26
-        carry[5] = h[5] >> 25
-        h[6] += carry[5]
-        h[5] -= carry[5] << 25
-        carry[6] = h[6] >> 26
-        h[7] += carry[6]
-        h[6] -= carry[6] << 26
-        carry[7] = h[7] >> 25
-        h[8] += carry[7]
-        h[7] -= carry[7] << 25
-        carry[8] = h[8] >> 26
-        h[9] += carry[8]
-        h[8] -= carry[8] << 26
-        carry[9] = h[9] >> 25
-        h[9] -= carry[9] << 25
-        // h10 = carry9
-
-        // Goal: Output h[0]+...+2^255 h10-2^255 q, which is between 0 and 2^255-20.
-        // Have h[0]+...+2^230 h[9] between 0 and 2^255-1;
-        // evidently 2^255 h10-2^255 q = 0.
-        // Goal: Output h[0]+...+2^230 h[9].
-
-        s[0] = byte(h[0] >> 0)
-        s[1] = byte(h[0] >> 8)
-        s[2] = byte(h[0] >> 16)
-        s[3] = byte((h[0] >> 24) | (h[1] << 2))
-        s[4] = byte(h[1] >> 6)
-        s[5] = byte(h[1] >> 14)
-        s[6] = byte((h[1] >> 22) | (h[2] << 3))
-        s[7] = byte(h[2] >> 5)
-        s[8] = byte(h[2] >> 13)
-        s[9] = byte((h[2] >> 21) | (h[3] << 5))
-        s[10] = byte(h[3] >> 3)
-        s[11] = byte(h[3] >> 11)
-        s[12] = byte((h[3] >> 19) | (h[4] << 6))
-        s[13] = byte(h[4] >> 2)
-        s[14] = byte(h[4] >> 10)
-        s[15] = byte(h[4] >> 18)
-        s[16] = byte(h[5] >> 0)
-        s[17] = byte(h[5] >> 8)
-        s[18] = byte(h[5] >> 16)
-        s[19] = byte((h[5] >> 24) | (h[6] << 1))
-        s[20] = byte(h[6] >> 7)
-        s[21] = byte(h[6] >> 15)
-        s[22] = byte((h[6] >> 23) | (h[7] << 3))
-        s[23] = byte(h[7] >> 5)
-        s[24] = byte(h[7] >> 13)
-        s[25] = byte((h[7] >> 21) | (h[8] << 4))
-        s[26] = byte(h[8] >> 4)
-        s[27] = byte(h[8] >> 12)
-        s[28] = byte((h[8] >> 20) | (h[9] << 6))
-        s[29] = byte(h[9] >> 2)
-        s[30] = byte(h[9] >> 10)
-        s[31] = byte(h[9] >> 18)
-}
-
-// feMul calculates h = f * g
-// Can overlap h with f or g.
-//
-// Preconditions:
-//    |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
-//    |g| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
-//
-// Postconditions:
-//    |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
-//
-// Notes on implementation strategy:
-//
-// Using schoolbook multiplication.
-// Karatsuba would save a little in some cost models.
-//
-// Most multiplications by 2 and 19 are 32-bit precomputations;
-// cheaper than 64-bit postcomputations.
-//
-// There is one remaining multiplication by 19 in the carry chain;
-// one *19 precomputation can be merged into this,
-// but the resulting data flow is considerably less clean.
-//
-// There are 12 carries below.
-// 10 of them are 2-way parallelizable and vectorizable.
-// Can get away with 11 carries, but then data flow is much deeper.
-//
-// With tighter constraints on inputs can squeeze carries into int32.
-func feMul(h, f, g *fieldElement) {
-        f0 := f[0]
-        f1 := f[1]
-        f2 := f[2]
-        f3 := f[3]
-        f4 := f[4]
-        f5 := f[5]
-        f6 := f[6]
-        f7 := f[7]
-        f8 := f[8]
-        f9 := f[9]
-        g0 := g[0]
-        g1 := g[1]
-        g2 := g[2]
-        g3 := g[3]
-        g4 := g[4]
-        g5 := g[5]
-        g6 := g[6]
-        g7 := g[7]
-        g8 := g[8]
-        g9 := g[9]
-        g1_19 := 19 * g1 // 1.4*2^29
-        g2_19 := 19 * g2 // 1.4*2^30; still ok
-        g3_19 := 19 * g3
-        g4_19 := 19 * g4
-        g5_19 := 19 * g5
-        g6_19 := 19 * g6
-        g7_19 := 19 * g7
-        g8_19 := 19 * g8
-        g9_19 := 19 * g9
-        f1_2 := 2 * f1
-        f3_2 := 2 * f3
-        f5_2 := 2 * f5
-        f7_2 := 2 * f7
-        f9_2 := 2 * f9
-        f0g0 := int64(f0) * int64(g0)
-        f0g1 := int64(f0) * int64(g1)
-        f0g2 := int64(f0) * int64(g2)
-        f0g3 := int64(f0) * int64(g3)
-        f0g4 := int64(f0) * int64(g4)
-        f0g5 := int64(f0) * int64(g5)
-        f0g6 := int64(f0) * int64(g6)
-        f0g7 := int64(f0) * int64(g7)
-        f0g8 := int64(f0) * int64(g8)
-        f0g9 := int64(f0) * int64(g9)
-        f1g0 := int64(f1) * int64(g0)
-        f1g1_2 := int64(f1_2) * int64(g1)
-        f1g2 := int64(f1) * int64(g2)
-        f1g3_2 := int64(f1_2) * int64(g3)
-        f1g4 := int64(f1) * int64(g4)
-        f1g5_2 := int64(f1_2) * int64(g5)
-        f1g6 := int64(f1) * int64(g6)
-        f1g7_2 := int64(f1_2) * int64(g7)
-        f1g8 := int64(f1) * int64(g8)
-        f1g9_38 := int64(f1_2) * int64(g9_19)
-        f2g0 := int64(f2) * int64(g0)
-        f2g1 := int64(f2) * int64(g1)
-        f2g2 := int64(f2) * int64(g2)
-        f2g3 := int64(f2) * int64(g3)
-        f2g4 := int64(f2) * int64(g4)
-        f2g5 := int64(f2) * int64(g5)
-        f2g6 := int64(f2) * int64(g6)
-        f2g7 := int64(f2) * int64(g7)
-        f2g8_19 := int64(f2) * int64(g8_19)
-        f2g9_19 := int64(f2) * int64(g9_19)
-        f3g0 := int64(f3) * int64(g0)
-        f3g1_2 := int64(f3_2) * int64(g1)
-        f3g2 := int64(f3) * int64(g2)
-        f3g3_2 := int64(f3_2) * int64(g3)
-        f3g4 := int64(f3) * int64(g4)
-        f3g5_2 := int64(f3_2) * int64(g5)
-        f3g6 := int64(f3) * int64(g6)
-        f3g7_38 := int64(f3_2) * int64(g7_19)
-        f3g8_19 := int64(f3) * int64(g8_19)
-        f3g9_38 := int64(f3_2) * int64(g9_19)
-        f4g0 := int64(f4) * int64(g0)
-        f4g1 := int64(f4) * int64(g1)
-        f4g2 := int64(f4) * int64(g2)
-        f4g3 := int64(f4) * int64(g3)
-        f4g4 := int64(f4) * int64(g4)
-        f4g5 := int64(f4) * int64(g5)
-        f4g6_19 := int64(f4) * int64(g6_19)
-        f4g7_19 := int64(f4) * int64(g7_19)
-        f4g8_19 := int64(f4) * int64(g8_19)
-        f4g9_19 := int64(f4) * int64(g9_19)
-        f5g0 := int64(f5) * int64(g0)
-        f5g1_2 := int64(f5_2) * int64(g1)
-        f5g2 := int64(f5) * int64(g2)
-        f5g3_2 := int64(f5_2) * int64(g3)
-        f5g4 := int64(f5) * int64(g4)
-        f5g5_38 := int64(f5_2) * int64(g5_19)
-        f5g6_19 := int64(f5) * int64(g6_19)
-        f5g7_38 := int64(f5_2) * int64(g7_19)
-        f5g8_19 := int64(f5) * int64(g8_19)
-        f5g9_38 := int64(f5_2) * int64(g9_19)
-        f6g0 := int64(f6) * int64(g0)
-        f6g1 := int64(f6) * int64(g1)
-        f6g2 := int64(f6) * int64(g2)
-        f6g3 := int64(f6) * int64(g3)
-        f6g4_19 := int64(f6) * int64(g4_19)
-        f6g5_19 := int64(f6) * int64(g5_19)
-        f6g6_19 := int64(f6) * int64(g6_19)
-        f6g7_19 := int64(f6) * int64(g7_19)
-        f6g8_19 := int64(f6) * int64(g8_19)
-        f6g9_19 := int64(f6) * int64(g9_19)
-        f7g0 := int64(f7) * int64(g0)
-        f7g1_2 := int64(f7_2) * int64(g1)
-        f7g2 := int64(f7) * int64(g2)
-        f7g3_38 := int64(f7_2) * int64(g3_19)
-        f7g4_19 := int64(f7) * int64(g4_19)
-        f7g5_38 := int64(f7_2) * int64(g5_19)
-        f7g6_19 := int64(f7) * int64(g6_19)
-        f7g7_38 := int64(f7_2) * int64(g7_19)
-        f7g8_19 := int64(f7) * int64(g8_19)
-        f7g9_38 := int64(f7_2) * int64(g9_19)
-        f8g0 := int64(f8) * int64(g0)
-        f8g1 := int64(f8) * int64(g1)
-        f8g2_19 := int64(f8) * int64(g2_19)
-        f8g3_19 := int64(f8) * int64(g3_19)
-        f8g4_19 := int64(f8) * int64(g4_19)
-        f8g5_19 := int64(f8) * int64(g5_19)
-        f8g6_19 := int64(f8) * int64(g6_19)
-        f8g7_19 := int64(f8) * int64(g7_19)
-        f8g8_19 := int64(f8) * int64(g8_19)
-        f8g9_19 := int64(f8) * int64(g9_19)
-        f9g0 := int64(f9) * int64(g0)
-        f9g1_38 := int64(f9_2) * int64(g1_19)
-        f9g2_19 := int64(f9) * int64(g2_19)
-        f9g3_38 := int64(f9_2) * int64(g3_19)
-        f9g4_19 := int64(f9) * int64(g4_19)
-        f9g5_38 := int64(f9_2) * int64(g5_19)
-        f9g6_19 := int64(f9) * int64(g6_19)
-        f9g7_38 := int64(f9_2) * int64(g7_19)
-        f9g8_19 := int64(f9) * int64(g8_19)
-        f9g9_38 := int64(f9_2) * int64(g9_19)
-        h0 := f0g0 + f1g9_38 + f2g8_19 + f3g7_38 + f4g6_19 + f5g5_38 + f6g4_19 + f7g3_38 + f8g2_19 + f9g1_38
-        h1 := f0g1 + f1g0 + f2g9_19 + f3g8_19 + f4g7_19 + f5g6_19 + f6g5_19 + f7g4_19 + f8g3_19 + f9g2_19
-        h2 := f0g2 + f1g1_2 + f2g0 + f3g9_38 + f4g8_19 + f5g7_38 + f6g6_19 + f7g5_38 + f8g4_19 + f9g3_38
-        h3 := f0g3 + f1g2 + f2g1 + f3g0 + f4g9_19 + f5g8_19 + f6g7_19 + f7g6_19 + f8g5_19 + f9g4_19
-        h4 := f0g4 + f1g3_2 + f2g2 + f3g1_2 + f4g0 + f5g9_38 + f6g8_19 + f7g7_38 + f8g6_19 + f9g5_38
-        h5 := f0g5 + f1g4 + f2g3 + f3g2 + f4g1 + f5g0 + f6g9_19 + f7g8_19 + f8g7_19 + f9g6_19
-        h6 := f0g6 + f1g5_2 + f2g4 + f3g3_2 + f4g2 + f5g1_2 + f6g0 + f7g9_38 + f8g8_19 + f9g7_38
-        h7 := f0g7 + f1g6 + f2g5 + f3g4 + f4g3 + f5g2 + f6g1 + f7g0 + f8g9_19 + f9g8_19
-        h8 := f0g8 + f1g7_2 + f2g6 + f3g5_2 + f4g4 + f5g3_2 + f6g2 + f7g1_2 + f8g0 + f9g9_38
-        h9 := f0g9 + f1g8 + f2g7 + f3g6 + f4g5 + f5g4 + f6g3 + f7g2 + f8g1 + f9g0
-        var carry [10]int64
-
-        // |h0| <= (1.1*1.1*2^52*(1+19+19+19+19)+1.1*1.1*2^50*(38+38+38+38+38))
-        //   i.e. |h0| <= 1.2*2^59; narrower ranges for h2, h4, h6, h8
-        // |h1| <= (1.1*1.1*2^51*(1+1+19+19+19+19+19+19+19+19))
-        //   i.e. |h1| <= 1.5*2^58; narrower ranges for h3, h5, h7, h9
-
-        carry[0] = (h0 + (1 << 25)) >> 26
-        h1 += carry[0]
-        h0 -= carry[0] << 26
-        carry[4] = (h4 + (1 << 25)) >> 26
-        h5 += carry[4]
-        h4 -= carry[4] << 26
-        // |h0| <= 2^25
-        // |h4| <= 2^25
-        // |h1| <= 1.51*2^58
-        // |h5| <= 1.51*2^58
-
-        carry[1] = (h1 + (1 << 24)) >> 25
-        h2 += carry[1]
-        h1 -= carry[1] << 25
-        carry[5] = (h5 + (1 << 24)) >> 25
-        h6 += carry[5]
-        h5 -= carry[5] << 25
-        // |h1| <= 2^24; from now on fits into int32
-        // |h5| <= 2^24; from now on fits into int32
-        // |h2| <= 1.21*2^59
-        // |h6| <= 1.21*2^59
-
-        carry[2] = (h2 + (1 << 25)) >> 26
-        h3 += carry[2]
-        h2 -= carry[2] << 26
-        carry[6] = (h6 + (1 << 25)) >> 26
-        h7 += carry[6]
-        h6 -= carry[6] << 26
-        // |h2| <= 2^25; from now on fits into int32 unchanged
-        // |h6| <= 2^25; from now on fits into int32 unchanged
-        // |h3| <= 1.51*2^58
-        // |h7| <= 1.51*2^58
-
-        carry[3] = (h3 + (1 << 24)) >> 25
-        h4 += carry[3]
-        h3 -= carry[3] << 25
-        carry[7] = (h7 + (1 << 24)) >> 25
-        h8 += carry[7]
-        h7 -= carry[7] << 25
-        // |h3| <= 2^24; from now on fits into int32 unchanged
-        // |h7| <= 2^24; from now on fits into int32 unchanged
-        // |h4| <= 1.52*2^33
-        // |h8| <= 1.52*2^33
-
-        carry[4] = (h4 + (1 << 25)) >> 26
-        h5 += carry[4]
-        h4 -= carry[4] << 26
-        carry[8] = (h8 + (1 << 25)) >> 26
-        h9 += carry[8]
-        h8 -= carry[8] << 26
-        // |h4| <= 2^25; from now on fits into int32 unchanged
-        // |h8| <= 2^25; from now on fits into int32 unchanged
-        // |h5| <= 1.01*2^24
-        // |h9| <= 1.51*2^58
-
-        carry[9] = (h9 + (1 << 24)) >> 25
-        h0 += carry[9] * 19
-        h9 -= carry[9] << 25
-        // |h9| <= 2^24; from now on fits into int32 unchanged
-        // |h0| <= 1.8*2^37
-
-        carry[0] = (h0 + (1 << 25)) >> 26
-        h1 += carry[0]
-        h0 -= carry[0] << 26
-        // |h0| <= 2^25; from now on fits into int32 unchanged
-        // |h1| <= 1.01*2^24
-
-        h[0] = int32(h0)
-        h[1] = int32(h1)
-        h[2] = int32(h2)
-        h[3] = int32(h3)
-        h[4] = int32(h4)
-        h[5] = int32(h5)
-        h[6] = int32(h6)
-        h[7] = int32(h7)
-        h[8] = int32(h8)
-        h[9] = int32(h9)
-}
-
-// feSquare calculates h = f*f. Can overlap h with f.
-//
-// Preconditions:
-//    |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
-//
-// Postconditions:
-//    |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
-func feSquare(h, f *fieldElement) {
-        f0 := f[0]
-        f1 := f[1]
-        f2 := f[2]
-        f3 := f[3]
-        f4 := f[4]
-        f5 := f[5]
-        f6 := f[6]
-        f7 := f[7]
-        f8 := f[8]
-        f9 := f[9]
-        f0_2 := 2 * f0
-        f1_2 := 2 * f1
-        f2_2 := 2 * f2
-        f3_2 := 2 * f3
-        f4_2 := 2 * f4
-        f5_2 := 2 * f5
-        f6_2 := 2 * f6
-        f7_2 := 2 * f7
-        f5_38 := 38 * f5 // 1.31*2^30
-        f6_19 := 19 * f6 // 1.31*2^30
-        f7_38 := 38 * f7 // 1.31*2^30
-        f8_19 := 19 * f8 // 1.31*2^30
-        f9_38 := 38 * f9 // 1.31*2^30
-        f0f0 := int64(f0) * int64(f0)
-        f0f1_2 := int64(f0_2) * int64(f1)
-        f0f2_2 := int64(f0_2) * int64(f2)
-        f0f3_2 := int64(f0_2) * int64(f3)
-        f0f4_2 := int64(f0_2) * int64(f4)
-        f0f5_2 := int64(f0_2) * int64(f5)
-        f0f6_2 := int64(f0_2) * int64(f6)
-        f0f7_2 := int64(f0_2) * int64(f7)
-        f0f8_2 := int64(f0_2) * int64(f8)
-        f0f9_2 := int64(f0_2) * int64(f9)
-        f1f1_2 := int64(f1_2) * int64(f1)
-        f1f2_2 := int64(f1_2) * int64(f2)
-        f1f3_4 := int64(f1_2) * int64(f3_2)
-        f1f4_2 := int64(f1_2) * int64(f4)
-        f1f5_4 := int64(f1_2) * int64(f5_2)
-        f1f6_2 := int64(f1_2) * int64(f6)
-        f1f7_4 := int64(f1_2) * int64(f7_2)
-        f1f8_2 := int64(f1_2) * int64(f8)
-        f1f9_76 := int64(f1_2) * int64(f9_38)
-        f2f2 := int64(f2) * int64(f2)
-        f2f3_2 := int64(f2_2) * int64(f3)
-        f2f4_2 := int64(f2_2) * int64(f4)
-        f2f5_2 := int64(f2_2) * int64(f5)
-        f2f6_2 := int64(f2_2) * int64(f6)
-        f2f7_2 := int64(f2_2) * int64(f7)
-        f2f8_38 := int64(f2_2) * int64(f8_19)
-        f2f9_38 := int64(f2) * int64(f9_38)
-        f3f3_2 := int64(f3_2) * int64(f3)
-        f3f4_2 := int64(f3_2) * int64(f4)
-        f3f5_4 := int64(f3_2) * int64(f5_2)
-        f3f6_2 := int64(f3_2) * int64(f6)
-        f3f7_76 := int64(f3_2) * int64(f7_38)
-        f3f8_38 := int64(f3_2) * int64(f8_19)
-        f3f9_76 := int64(f3_2) * int64(f9_38)
-        f4f4 := int64(f4) * int64(f4)
-        f4f5_2 := int64(f4_2) * int64(f5)
-        f4f6_38 := int64(f4_2) * int64(f6_19)
-        f4f7_38 := int64(f4) * int64(f7_38)
-        f4f8_38 := int64(f4_2) * int64(f8_19)
-        f4f9_38 := int64(f4) * int64(f9_38)
-        f5f5_38 := int64(f5) * int64(f5_38)
-        f5f6_38 := int64(f5_2) * int64(f6_19)
-        f5f7_76 := int64(f5_2) * int64(f7_38)
-        f5f8_38 := int64(f5_2) * int64(f8_19)
-        f5f9_76 := int64(f5_2) * int64(f9_38)
-        f6f6_19 := int64(f6) * int64(f6_19)
-        f6f7_38 := int64(f6) * int64(f7_38)
-        f6f8_38 := int64(f6_2) * int64(f8_19)
-        f6f9_38 := int64(f6) * int64(f9_38)
-        f7f7_38 := int64(f7) * int64(f7_38)
-        f7f8_38 := int64(f7_2) * int64(f8_19)
-        f7f9_76 := int64(f7_2) * int64(f9_38)
-        f8f8_19 := int64(f8) * int64(f8_19)
-        f8f9_38 := int64(f8) * int64(f9_38)
-        f9f9_38 := int64(f9) * int64(f9_38)
-        h0 := f0f0 + f1f9_76 + f2f8_38 + f3f7_76 + f4f6_38 + f5f5_38
-        h1 := f0f1_2 + f2f9_38 + f3f8_38 + f4f7_38 + f5f6_38
-        h2 := f0f2_2 + f1f1_2 + f3f9_76 + f4f8_38 + f5f7_76 + f6f6_19
-        h3 := f0f3_2 + f1f2_2 + f4f9_38 + f5f8_38 + f6f7_38
-        h4 := f0f4_2 + f1f3_4 + f2f2 + f5f9_76 + f6f8_38 + f7f7_38
-        h5 := f0f5_2 + f1f4_2 + f2f3_2 + f6f9_38 + f7f8_38
-        h6 := f0f6_2 + f1f5_4 + f2f4_2 + f3f3_2 + f7f9_76 + f8f8_19
-        h7 := f0f7_2 + f1f6_2 + f2f5_2 + f3f4_2 + f8f9_38
-        h8 := f0f8_2 + f1f7_4 + f2f6_2 + f3f5_4 + f4f4 + f9f9_38
-        h9 := f0f9_2 + f1f8_2 + f2f7_2 + f3f6_2 + f4f5_2
-        var carry [10]int64
-
-        carry[0] = (h0 + (1 << 25)) >> 26
-        h1 += carry[0]
-        h0 -= carry[0] << 26
-        carry[4] = (h4 + (1 << 25)) >> 26
-        h5 += carry[4]
-        h4 -= carry[4] << 26
-
-        carry[1] = (h1 + (1 << 24)) >> 25
-        h2 += carry[1]
-        h1 -= carry[1] << 25
-        carry[5] = (h5 + (1 << 24)) >> 25
-        h6 += carry[5]
-        h5 -= carry[5] << 25
-
-        carry[2] = (h2 + (1 << 25)) >> 26
-        h3 += carry[2]
-        h2 -= carry[2] << 26
-        carry[6] = (h6 + (1 << 25)) >> 26
-        h7 += carry[6]
-        h6 -= carry[6] << 26
-
-        carry[3] = (h3 + (1 << 24)) >> 25
-        h4 += carry[3]
-        h3 -= carry[3] << 25
-        carry[7] = (h7 + (1 << 24)) >> 25
-        h8 += carry[7]
-        h7 -= carry[7] << 25
-
-        carry[4] = (h4 + (1 << 25)) >> 26
-        h5 += carry[4]
-        h4 -= carry[4] << 26
-        carry[8] = (h8 + (1 << 25)) >> 26
-        h9 += carry[8]
-        h8 -= carry[8] << 26
-
-        carry[9] = (h9 + (1 << 24)) >> 25
-        h0 += carry[9] * 19
-        h9 -= carry[9] << 25
-
-        carry[0] = (h0 + (1 << 25)) >> 26
-        h1 += carry[0]
-        h0 -= carry[0] << 26
-
-        h[0] = int32(h0)
-        h[1] = int32(h1)
-        h[2] = int32(h2)
-        h[3] = int32(h3)
-        h[4] = int32(h4)
-        h[5] = int32(h5)
-        h[6] = int32(h6)
-        h[7] = int32(h7)
-        h[8] = int32(h8)
-        h[9] = int32(h9)
-}
-
-// feMul121666 calculates h = f * 121666. Can overlap h with f.
-//
-// Preconditions:
-//    |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
-//
-// Postconditions:
-//    |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
-func feMul121666(h, f *fieldElement) {
-        h0 := int64(f[0]) * 121666
-        h1 := int64(f[1]) * 121666
-        h2 := int64(f[2]) * 121666
-        h3 := int64(f[3]) * 121666
-        h4 := int64(f[4]) * 121666
-        h5 := int64(f[5]) * 121666
-        h6 := int64(f[6]) * 121666
-        h7 := int64(f[7]) * 121666
-        h8 := int64(f[8]) * 121666
-        h9 := int64(f[9]) * 121666
-        var carry [10]int64
-
-        carry[9] = (h9 + (1 << 24)) >> 25
-        h0 += carry[9] * 19
-        h9 -= carry[9] << 25
-        carry[1] = (h1 + (1 << 24)) >> 25
-        h2 += carry[1]
-        h1 -= carry[1] << 25
-        carry[3] = (h3 + (1 << 24)) >> 25
-        h4 += carry[3]
-        h3 -= carry[3] << 25
-        carry[5] = (h5 + (1 << 24)) >> 25
-        h6 += carry[5]
-        h5 -= carry[5] << 25
-        carry[7] = (h7 + (1 << 24)) >> 25
-        h8 += carry[7]
-        h7 -= carry[7] << 25
-
-        carry[0] = (h0 + (1 << 25)) >> 26
-        h1 += carry[0]
-        h0 -= carry[0] << 26
-        carry[2] = (h2 + (1 << 25)) >> 26
-        h3 += carry[2]
-        h2 -= carry[2] << 26
-        carry[4] = (h4 + (1 << 25)) >> 26
-        h5 += carry[4]
-        h4 -= carry[4] << 26
-        carry[6] = (h6 + (1 << 25)) >> 26
-        h7 += carry[6]
-        h6 -= carry[6] << 26
-        carry[8] = (h8 + (1 << 25)) >> 26
-        h9 += carry[8]
-        h8 -= carry[8] << 26
-
-        h[0] = int32(h0)
-        h[1] = int32(h1)
-        h[2] = int32(h2)
-        h[3] = int32(h3)
-        h[4] = int32(h4)
-        h[5] = int32(h5)
-        h[6] = int32(h6)
-        h[7] = int32(h7)
-        h[8] = int32(h8)
-        h[9] = int32(h9)
-}
-
-// feInvert sets out = z^-1.
-func feInvert(out, z *fieldElement) {
-        var t0, t1, t2, t3 fieldElement
-        var i int
-
-        feSquare(&t0, z)
-        for i = 1; i < 1; i++ {
-                feSquare(&t0, &t0)
-        }
-        feSquare(&t1, &t0)
-        for i = 1; i < 2; i++ {
-                feSquare(&t1, &t1)
-        }
-        feMul(&t1, z, &t1)
-        feMul(&t0, &t0, &t1)
-        feSquare(&t2, &t0)
-        for i = 1; i < 1; i++ {
-                feSquare(&t2, &t2)
-        }
-        feMul(&t1, &t1, &t2)
-        feSquare(&t2, &t1)
-        for i = 1; i < 5; i++ {
-                feSquare(&t2, &t2)
-        }
-        feMul(&t1, &t2, &t1)
-        feSquare(&t2, &t1)
-        for i = 1; i < 10; i++ {
-                feSquare(&t2, &t2)
-        }
-        feMul(&t2, &t2, &t1)
-        feSquare(&t3, &t2)
-        for i = 1; i < 20; i++ {
-                feSquare(&t3, &t3)
-        }
-        feMul(&t2, &t3, &t2)
-        feSquare(&t2, &t2)
-        for i = 1; i < 10; i++ {
-                feSquare(&t2, &t2)
-        }
-        feMul(&t1, &t2, &t1)
-        feSquare(&t2, &t1)
-        for i = 1; i < 50; i++ {
-                feSquare(&t2, &t2)
-        }
-        feMul(&t2, &t2, &t1)
-        feSquare(&t3, &t2)
-        for i = 1; i < 100; i++ {
-                feSquare(&t3, &t3)
-        }
-        feMul(&t2, &t3, &t2)
-        feSquare(&t2, &t2)
-        for i = 1; i < 50; i++ {
-                feSquare(&t2, &t2)
-        }
-        feMul(&t1, &t2, &t1)
-        feSquare(&t1, &t1)
-        for i = 1; i < 5; i++ {
-                feSquare(&t1, &t1)
-        }
-        feMul(out, &t1, &t0)
-}
-
-func scalarMult(out, in, base *[32]byte) {
-        var e [32]byte
-
-        copy(e[:], in[:])
-        e[0] &= 248
-        e[31] &= 127
-        e[31] |= 64
-
-        var x1, x2, z2, x3, z3, tmp0, tmp1 fieldElement
-        feFromBytes(&x1, base)
-        feOne(&x2)
-        feCopy(&x3, &x1)
-        feOne(&z3)
-
-        swap := int32(0)
-        for pos := 254; pos >= 0; pos-- {
-                b := e[pos/8] >> uint(pos&7)
-                b &= 1
-                swap ^= int32(b)
-                feCSwap(&x2, &x3, swap)
-                feCSwap(&z2, &z3, swap)
-                swap = int32(b)
-
-                feSub(&tmp0, &x3, &z3)
-                feSub(&tmp1, &x2, &z2)
-                feAdd(&x2, &x2, &z2)
-                feAdd(&z2, &x3, &z3)
-                feMul(&z3, &tmp0, &x2)
-                feMul(&z2, &z2, &tmp1)
-                feSquare(&tmp0, &tmp1)
-                feSquare(&tmp1, &x2)
-                feAdd(&x3, &z3, &z2)
-                feSub(&z2, &z3, &z2)
-                feMul(&x2, &tmp1, &tmp0)
-                feSub(&tmp1, &tmp1, &tmp0)
-                feSquare(&z2, &z2)
-                feMul121666(&z3, &tmp1)
-                feSquare(&x3, &x3)
-                feAdd(&tmp0, &tmp0, &z3)
-                feMul(&z3, &x1, &z2)
-                feMul(&z2, &tmp1, &tmp0)
-        }
-
-        feCSwap(&x2, &x3, swap)
-        feCSwap(&z2, &z3, swap)
-
-        feInvert(&z2, &z2)
-        feMul(&x2, &x2, &z2)
-        feToBytes(out, &x2)
-}
diff --git a/vendor/golang.org/x/crypto/curve25519/doc.go b/vendor/golang.org/x/crypto/curve25519/doc.go
deleted file mode 100644
index ebeea3c..0000000
--- a/vendor/golang.org/x/crypto/curve25519/doc.go
+++ /dev/null
@@ -1,23 +0,0 @@
-// 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 curve25519 provides an implementation of scalar multiplication on
-// the elliptic curve known as curve25519. See http://cr.yp.to/ecdh.html
-package curve25519 // import "golang.org/x/crypto/curve25519"
-
-// basePoint is the x coordinate of the generator of the curve.
-var basePoint = [32]byte{9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
-
-// ScalarMult sets dst to the product in*base where dst and base are the x
-// coordinates of group points and all values are in little-endian form.
-func ScalarMult(dst, in, base *[32]byte) {
-        scalarMult(dst, in, base)
-}
-
-// ScalarBaseMult sets dst to the product in*base where dst and base are the x
-// coordinates of group points, base is the standard generator and all values
-// are in little-endian form.
-func ScalarBaseMult(dst, in *[32]byte) {
-        ScalarMult(dst, in, &basePoint)
-}
diff --git a/vendor/golang.org/x/crypto/curve25519/freeze_amd64.s b/vendor/golang.org/x/crypto/curve25519/freeze_amd64.s
deleted file mode 100644
index 536479b..0000000
--- a/vendor/golang.org/x/crypto/curve25519/freeze_amd64.s
+++ /dev/null
@@ -1,73 +0,0 @@
-// 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.
-
-// This code was translated into a form compatible with 6a from the public
-// domain sources in SUPERCOP: http://bench.cr.yp.to/supercop.html
-
-// +build amd64,!gccgo,!appengine
-
-#include "const_amd64.h"
-
-// func freeze(inout *[5]uint64)
-TEXT ·freeze(SB),7,$0-8
-        MOVQ inout+0(FP), DI
-
-        MOVQ 0(DI),SI
-        MOVQ 8(DI),DX
-        MOVQ 16(DI),CX
-        MOVQ 24(DI),R8
-        MOVQ 32(DI),R9
-        MOVQ $REDMASK51,AX
-        MOVQ AX,R10
-        SUBQ $18,R10
-        MOVQ $3,R11
-REDUCELOOP:
-        MOVQ SI,R12
-        SHRQ $51,R12
-        ANDQ AX,SI
-        ADDQ R12,DX
-        MOVQ DX,R12
-        SHRQ $51,R12
-        ANDQ AX,DX
-        ADDQ R12,CX
-        MOVQ CX,R12
-        SHRQ $51,R12
-        ANDQ AX,CX
-        ADDQ R12,R8
-        MOVQ R8,R12
-        SHRQ $51,R12
-        ANDQ AX,R8
-        ADDQ R12,R9
-        MOVQ R9,R12
-        SHRQ $51,R12
-        ANDQ AX,R9
-        IMUL3Q $19,R12,R12
-        ADDQ R12,SI
-        SUBQ $1,R11
-        JA REDUCELOOP
-        MOVQ $1,R12
-        CMPQ R10,SI
-        CMOVQLT R11,R12
-        CMPQ AX,DX
-        CMOVQNE R11,R12
-        CMPQ AX,CX
-        CMOVQNE R11,R12
-        CMPQ AX,R8
-        CMOVQNE R11,R12
-        CMPQ AX,R9
-        CMOVQNE R11,R12
-        NEGQ R12
-        ANDQ R12,AX
-        ANDQ R12,R10
-        SUBQ R10,SI
-        SUBQ AX,DX
-        SUBQ AX,CX
-        SUBQ AX,R8
-        SUBQ AX,R9
-        MOVQ SI,0(DI)
-        MOVQ DX,8(DI)
-        MOVQ CX,16(DI)
-        MOVQ R8,24(DI)
-        MOVQ R9,32(DI)
-        RET
diff --git a/vendor/golang.org/x/crypto/curve25519/ladderstep_amd64.s b/vendor/golang.org/x/crypto/curve25519/ladderstep_amd64.s
deleted file mode 100644
index 7074e5c..0000000
--- a/vendor/golang.org/x/crypto/curve25519/ladderstep_amd64.s
+++ /dev/null
@@ -1,1377 +0,0 @@
-// 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.
-
-// This code was translated into a form compatible with 6a from the public
-// domain sources in SUPERCOP: http://bench.cr.yp.to/supercop.html
-
-// +build amd64,!gccgo,!appengine
-
-#include "const_amd64.h"
-
-// func ladderstep(inout *[5][5]uint64)
-TEXT ·ladderstep(SB),0,$296-8
-        MOVQ inout+0(FP),DI
-
-        MOVQ 40(DI),SI
-        MOVQ 48(DI),DX
-        MOVQ 56(DI),CX
-        MOVQ 64(DI),R8
-        MOVQ 72(DI),R9
-        MOVQ SI,AX
-        MOVQ DX,R10
-        MOVQ CX,R11
-        MOVQ R8,R12
-        MOVQ R9,R13
-        ADDQ ·_2P0(SB),AX
-        ADDQ ·_2P1234(SB),R10
-        ADDQ ·_2P1234(SB),R11
-        ADDQ ·_2P1234(SB),R12
-        ADDQ ·_2P1234(SB),R13
-        ADDQ 80(DI),SI
-        ADDQ 88(DI),DX
-        ADDQ 96(DI),CX
-        ADDQ 104(DI),R8
-        ADDQ 112(DI),R9
-        SUBQ 80(DI),AX
-        SUBQ 88(DI),R10
-        SUBQ 96(DI),R11
-        SUBQ 104(DI),R12
-        SUBQ 112(DI),R13
-        MOVQ SI,0(SP)
-        MOVQ DX,8(SP)
-        MOVQ CX,16(SP)
-        MOVQ R8,24(SP)
-        MOVQ R9,32(SP)
-        MOVQ AX,40(SP)
-        MOVQ R10,48(SP)
-        MOVQ R11,56(SP)
-        MOVQ R12,64(SP)
-        MOVQ R13,72(SP)
-        MOVQ 40(SP),AX
-        MULQ 40(SP)
-        MOVQ AX,SI
-        MOVQ DX,CX
-        MOVQ 40(SP),AX
-        SHLQ $1,AX
-        MULQ 48(SP)
-        MOVQ AX,R8
-        MOVQ DX,R9
-        MOVQ 40(SP),AX
-        SHLQ $1,AX
-        MULQ 56(SP)
-        MOVQ AX,R10
-        MOVQ DX,R11
-        MOVQ 40(SP),AX
-        SHLQ $1,AX
-        MULQ 64(SP)
-        MOVQ AX,R12
-        MOVQ DX,R13
-        MOVQ 40(SP),AX
-        SHLQ $1,AX
-        MULQ 72(SP)
-        MOVQ AX,R14
-        MOVQ DX,R15
-        MOVQ 48(SP),AX
-        MULQ 48(SP)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 48(SP),AX
-        SHLQ $1,AX
-        MULQ 56(SP)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 48(SP),AX
-        SHLQ $1,AX
-        MULQ 64(SP)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 48(SP),DX
-        IMUL3Q $38,DX,AX
-        MULQ 72(SP)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 56(SP),AX
-        MULQ 56(SP)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 56(SP),DX
-        IMUL3Q $38,DX,AX
-        MULQ 64(SP)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 56(SP),DX
-        IMUL3Q $38,DX,AX
-        MULQ 72(SP)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 64(SP),DX
-        IMUL3Q $19,DX,AX
-        MULQ 64(SP)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 64(SP),DX
-        IMUL3Q $38,DX,AX
-        MULQ 72(SP)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 72(SP),DX
-        IMUL3Q $19,DX,AX
-        MULQ 72(SP)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ $REDMASK51,DX
-        SHLQ $13,CX:SI
-        ANDQ DX,SI
-        SHLQ $13,R9:R8
-        ANDQ DX,R8
-        ADDQ CX,R8
-        SHLQ $13,R11:R10
-        ANDQ DX,R10
-        ADDQ R9,R10
-        SHLQ $13,R13:R12
-        ANDQ DX,R12
-        ADDQ R11,R12
-        SHLQ $13,R15:R14
-        ANDQ DX,R14
-        ADDQ R13,R14
-        IMUL3Q $19,R15,CX
-        ADDQ CX,SI
-        MOVQ SI,CX
-        SHRQ $51,CX
-        ADDQ R8,CX
-        ANDQ DX,SI
-        MOVQ CX,R8
-        SHRQ $51,CX
-        ADDQ R10,CX
-        ANDQ DX,R8
-        MOVQ CX,R9
-        SHRQ $51,CX
-        ADDQ R12,CX
-        ANDQ DX,R9
-        MOVQ CX,AX
-        SHRQ $51,CX
-        ADDQ R14,CX
-        ANDQ DX,AX
-        MOVQ CX,R10
-        SHRQ $51,CX
-        IMUL3Q $19,CX,CX
-        ADDQ CX,SI
-        ANDQ DX,R10
-        MOVQ SI,80(SP)
-        MOVQ R8,88(SP)
-        MOVQ R9,96(SP)
-        MOVQ AX,104(SP)
-        MOVQ R10,112(SP)
-        MOVQ 0(SP),AX
-        MULQ 0(SP)
-        MOVQ AX,SI
-        MOVQ DX,CX
-        MOVQ 0(SP),AX
-        SHLQ $1,AX
-        MULQ 8(SP)
-        MOVQ AX,R8
-        MOVQ DX,R9
-        MOVQ 0(SP),AX
-        SHLQ $1,AX
-        MULQ 16(SP)
-        MOVQ AX,R10
-        MOVQ DX,R11
-        MOVQ 0(SP),AX
-        SHLQ $1,AX
-        MULQ 24(SP)
-        MOVQ AX,R12
-        MOVQ DX,R13
-        MOVQ 0(SP),AX
-        SHLQ $1,AX
-        MULQ 32(SP)
-        MOVQ AX,R14
-        MOVQ DX,R15
-        MOVQ 8(SP),AX
-        MULQ 8(SP)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 8(SP),AX
-        SHLQ $1,AX
-        MULQ 16(SP)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 8(SP),AX
-        SHLQ $1,AX
-        MULQ 24(SP)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 8(SP),DX
-        IMUL3Q $38,DX,AX
-        MULQ 32(SP)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 16(SP),AX
-        MULQ 16(SP)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 16(SP),DX
-        IMUL3Q $38,DX,AX
-        MULQ 24(SP)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 16(SP),DX
-        IMUL3Q $38,DX,AX
-        MULQ 32(SP)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 24(SP),DX
-        IMUL3Q $19,DX,AX
-        MULQ 24(SP)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 24(SP),DX
-        IMUL3Q $38,DX,AX
-        MULQ 32(SP)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 32(SP),DX
-        IMUL3Q $19,DX,AX
-        MULQ 32(SP)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ $REDMASK51,DX
-        SHLQ $13,CX:SI
-        ANDQ DX,SI
-        SHLQ $13,R9:R8
-        ANDQ DX,R8
-        ADDQ CX,R8
-        SHLQ $13,R11:R10
-        ANDQ DX,R10
-        ADDQ R9,R10
-        SHLQ $13,R13:R12
-        ANDQ DX,R12
-        ADDQ R11,R12
-        SHLQ $13,R15:R14
-        ANDQ DX,R14
-        ADDQ R13,R14
-        IMUL3Q $19,R15,CX
-        ADDQ CX,SI
-        MOVQ SI,CX
-        SHRQ $51,CX
-        ADDQ R8,CX
-        ANDQ DX,SI
-        MOVQ CX,R8
-        SHRQ $51,CX
-        ADDQ R10,CX
-        ANDQ DX,R8
-        MOVQ CX,R9
-        SHRQ $51,CX
-        ADDQ R12,CX
-        ANDQ DX,R9
-        MOVQ CX,AX
-        SHRQ $51,CX
-        ADDQ R14,CX
-        ANDQ DX,AX
-        MOVQ CX,R10
-        SHRQ $51,CX
-        IMUL3Q $19,CX,CX
-        ADDQ CX,SI
-        ANDQ DX,R10
-        MOVQ SI,120(SP)
-        MOVQ R8,128(SP)
-        MOVQ R9,136(SP)
-        MOVQ AX,144(SP)
-        MOVQ R10,152(SP)
-        MOVQ SI,SI
-        MOVQ R8,DX
-        MOVQ R9,CX
-        MOVQ AX,R8
-        MOVQ R10,R9
-        ADDQ ·_2P0(SB),SI
-        ADDQ ·_2P1234(SB),DX
-        ADDQ ·_2P1234(SB),CX
-        ADDQ ·_2P1234(SB),R8
-        ADDQ ·_2P1234(SB),R9
-        SUBQ 80(SP),SI
-        SUBQ 88(SP),DX
-        SUBQ 96(SP),CX
-        SUBQ 104(SP),R8
-        SUBQ 112(SP),R9
-        MOVQ SI,160(SP)
-        MOVQ DX,168(SP)
-        MOVQ CX,176(SP)
-        MOVQ R8,184(SP)
-        MOVQ R9,192(SP)
-        MOVQ 120(DI),SI
-        MOVQ 128(DI),DX
-        MOVQ 136(DI),CX
-        MOVQ 144(DI),R8
-        MOVQ 152(DI),R9
-        MOVQ SI,AX
-        MOVQ DX,R10
-        MOVQ CX,R11
-        MOVQ R8,R12
-        MOVQ R9,R13
-        ADDQ ·_2P0(SB),AX
-        ADDQ ·_2P1234(SB),R10
-        ADDQ ·_2P1234(SB),R11
-        ADDQ ·_2P1234(SB),R12
-        ADDQ ·_2P1234(SB),R13
-        ADDQ 160(DI),SI
-        ADDQ 168(DI),DX
-        ADDQ 176(DI),CX
-        ADDQ 184(DI),R8
-        ADDQ 192(DI),R9
-        SUBQ 160(DI),AX
-        SUBQ 168(DI),R10
-        SUBQ 176(DI),R11
-        SUBQ 184(DI),R12
-        SUBQ 192(DI),R13
-        MOVQ SI,200(SP)
-        MOVQ DX,208(SP)
-        MOVQ CX,216(SP)
-        MOVQ R8,224(SP)
-        MOVQ R9,232(SP)
-        MOVQ AX,240(SP)
-        MOVQ R10,248(SP)
-        MOVQ R11,256(SP)
-        MOVQ R12,264(SP)
-        MOVQ R13,272(SP)
-        MOVQ 224(SP),SI
-        IMUL3Q $19,SI,AX
-        MOVQ AX,280(SP)
-        MULQ 56(SP)
-        MOVQ AX,SI
-        MOVQ DX,CX
-        MOVQ 232(SP),DX
-        IMUL3Q $19,DX,AX
-        MOVQ AX,288(SP)
-        MULQ 48(SP)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 200(SP),AX
-        MULQ 40(SP)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 200(SP),AX
-        MULQ 48(SP)
-        MOVQ AX,R8
-        MOVQ DX,R9
-        MOVQ 200(SP),AX
-        MULQ 56(SP)
-        MOVQ AX,R10
-        MOVQ DX,R11
-        MOVQ 200(SP),AX
-        MULQ 64(SP)
-        MOVQ AX,R12
-        MOVQ DX,R13
-        MOVQ 200(SP),AX
-        MULQ 72(SP)
-        MOVQ AX,R14
-        MOVQ DX,R15
-        MOVQ 208(SP),AX
-        MULQ 40(SP)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 208(SP),AX
-        MULQ 48(SP)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 208(SP),AX
-        MULQ 56(SP)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 208(SP),AX
-        MULQ 64(SP)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 208(SP),DX
-        IMUL3Q $19,DX,AX
-        MULQ 72(SP)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 216(SP),AX
-        MULQ 40(SP)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 216(SP),AX
-        MULQ 48(SP)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 216(SP),AX
-        MULQ 56(SP)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 216(SP),DX
-        IMUL3Q $19,DX,AX
-        MULQ 64(SP)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 216(SP),DX
-        IMUL3Q $19,DX,AX
-        MULQ 72(SP)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 224(SP),AX
-        MULQ 40(SP)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 224(SP),AX
-        MULQ 48(SP)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 280(SP),AX
-        MULQ 64(SP)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 280(SP),AX
-        MULQ 72(SP)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 232(SP),AX
-        MULQ 40(SP)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 288(SP),AX
-        MULQ 56(SP)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 288(SP),AX
-        MULQ 64(SP)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 288(SP),AX
-        MULQ 72(SP)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ $REDMASK51,DX
-        SHLQ $13,CX:SI
-        ANDQ DX,SI
-        SHLQ $13,R9:R8
-        ANDQ DX,R8
-        ADDQ CX,R8
-        SHLQ $13,R11:R10
-        ANDQ DX,R10
-        ADDQ R9,R10
-        SHLQ $13,R13:R12
-        ANDQ DX,R12
-        ADDQ R11,R12
-        SHLQ $13,R15:R14
-        ANDQ DX,R14
-        ADDQ R13,R14
-        IMUL3Q $19,R15,CX
-        ADDQ CX,SI
-        MOVQ SI,CX
-        SHRQ $51,CX
-        ADDQ R8,CX
-        MOVQ CX,R8
-        SHRQ $51,CX
-        ANDQ DX,SI
-        ADDQ R10,CX
-        MOVQ CX,R9
-        SHRQ $51,CX
-        ANDQ DX,R8
-        ADDQ R12,CX
-        MOVQ CX,AX
-        SHRQ $51,CX
-        ANDQ DX,R9
-        ADDQ R14,CX
-        MOVQ CX,R10
-        SHRQ $51,CX
-        ANDQ DX,AX
-        IMUL3Q $19,CX,CX
-        ADDQ CX,SI
-        ANDQ DX,R10
-        MOVQ SI,40(SP)
-        MOVQ R8,48(SP)
-        MOVQ R9,56(SP)
-        MOVQ AX,64(SP)
-        MOVQ R10,72(SP)
-        MOVQ 264(SP),SI
-        IMUL3Q $19,SI,AX
-        MOVQ AX,200(SP)
-        MULQ 16(SP)
-        MOVQ AX,SI
-        MOVQ DX,CX
-        MOVQ 272(SP),DX
-        IMUL3Q $19,DX,AX
-        MOVQ AX,208(SP)
-        MULQ 8(SP)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 240(SP),AX
-        MULQ 0(SP)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 240(SP),AX
-        MULQ 8(SP)
-        MOVQ AX,R8
-        MOVQ DX,R9
-        MOVQ 240(SP),AX
-        MULQ 16(SP)
-        MOVQ AX,R10
-        MOVQ DX,R11
-        MOVQ 240(SP),AX
-        MULQ 24(SP)
-        MOVQ AX,R12
-        MOVQ DX,R13
-        MOVQ 240(SP),AX
-        MULQ 32(SP)
-        MOVQ AX,R14
-        MOVQ DX,R15
-        MOVQ 248(SP),AX
-        MULQ 0(SP)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 248(SP),AX
-        MULQ 8(SP)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 248(SP),AX
-        MULQ 16(SP)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 248(SP),AX
-        MULQ 24(SP)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 248(SP),DX
-        IMUL3Q $19,DX,AX
-        MULQ 32(SP)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 256(SP),AX
-        MULQ 0(SP)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 256(SP),AX
-        MULQ 8(SP)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 256(SP),AX
-        MULQ 16(SP)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 256(SP),DX
-        IMUL3Q $19,DX,AX
-        MULQ 24(SP)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 256(SP),DX
-        IMUL3Q $19,DX,AX
-        MULQ 32(SP)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 264(SP),AX
-        MULQ 0(SP)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 264(SP),AX
-        MULQ 8(SP)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 200(SP),AX
-        MULQ 24(SP)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 200(SP),AX
-        MULQ 32(SP)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 272(SP),AX
-        MULQ 0(SP)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 208(SP),AX
-        MULQ 16(SP)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 208(SP),AX
-        MULQ 24(SP)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 208(SP),AX
-        MULQ 32(SP)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ $REDMASK51,DX
-        SHLQ $13,CX:SI
-        ANDQ DX,SI
-        SHLQ $13,R9:R8
-        ANDQ DX,R8
-        ADDQ CX,R8
-        SHLQ $13,R11:R10
-        ANDQ DX,R10
-        ADDQ R9,R10
-        SHLQ $13,R13:R12
-        ANDQ DX,R12
-        ADDQ R11,R12
-        SHLQ $13,R15:R14
-        ANDQ DX,R14
-        ADDQ R13,R14
-        IMUL3Q $19,R15,CX
-        ADDQ CX,SI
-        MOVQ SI,CX
-        SHRQ $51,CX
-        ADDQ R8,CX
-        MOVQ CX,R8
-        SHRQ $51,CX
-        ANDQ DX,SI
-        ADDQ R10,CX
-        MOVQ CX,R9
-        SHRQ $51,CX
-        ANDQ DX,R8
-        ADDQ R12,CX
-        MOVQ CX,AX
-        SHRQ $51,CX
-        ANDQ DX,R9
-        ADDQ R14,CX
-        MOVQ CX,R10
-        SHRQ $51,CX
-        ANDQ DX,AX
-        IMUL3Q $19,CX,CX
-        ADDQ CX,SI
-        ANDQ DX,R10
-        MOVQ SI,DX
-        MOVQ R8,CX
-        MOVQ R9,R11
-        MOVQ AX,R12
-        MOVQ R10,R13
-        ADDQ ·_2P0(SB),DX
-        ADDQ ·_2P1234(SB),CX
-        ADDQ ·_2P1234(SB),R11
-        ADDQ ·_2P1234(SB),R12
-        ADDQ ·_2P1234(SB),R13
-        ADDQ 40(SP),SI
-        ADDQ 48(SP),R8
-        ADDQ 56(SP),R9
-        ADDQ 64(SP),AX
-        ADDQ 72(SP),R10
-        SUBQ 40(SP),DX
-        SUBQ 48(SP),CX
-        SUBQ 56(SP),R11
-        SUBQ 64(SP),R12
-        SUBQ 72(SP),R13
-        MOVQ SI,120(DI)
-        MOVQ R8,128(DI)
-        MOVQ R9,136(DI)
-        MOVQ AX,144(DI)
-        MOVQ R10,152(DI)
-        MOVQ DX,160(DI)
-        MOVQ CX,168(DI)
-        MOVQ R11,176(DI)
-        MOVQ R12,184(DI)
-        MOVQ R13,192(DI)
-        MOVQ 120(DI),AX
-        MULQ 120(DI)
-        MOVQ AX,SI
-        MOVQ DX,CX
-        MOVQ 120(DI),AX
-        SHLQ $1,AX
-        MULQ 128(DI)
-        MOVQ AX,R8
-        MOVQ DX,R9
-        MOVQ 120(DI),AX
-        SHLQ $1,AX
-        MULQ 136(DI)
-        MOVQ AX,R10
-        MOVQ DX,R11
-        MOVQ 120(DI),AX
-        SHLQ $1,AX
-        MULQ 144(DI)
-        MOVQ AX,R12
-        MOVQ DX,R13
-        MOVQ 120(DI),AX
-        SHLQ $1,AX
-        MULQ 152(DI)
-        MOVQ AX,R14
-        MOVQ DX,R15
-        MOVQ 128(DI),AX
-        MULQ 128(DI)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 128(DI),AX
-        SHLQ $1,AX
-        MULQ 136(DI)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 128(DI),AX
-        SHLQ $1,AX
-        MULQ 144(DI)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 128(DI),DX
-        IMUL3Q $38,DX,AX
-        MULQ 152(DI)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 136(DI),AX
-        MULQ 136(DI)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 136(DI),DX
-        IMUL3Q $38,DX,AX
-        MULQ 144(DI)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 136(DI),DX
-        IMUL3Q $38,DX,AX
-        MULQ 152(DI)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 144(DI),DX
-        IMUL3Q $19,DX,AX
-        MULQ 144(DI)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 144(DI),DX
-        IMUL3Q $38,DX,AX
-        MULQ 152(DI)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 152(DI),DX
-        IMUL3Q $19,DX,AX
-        MULQ 152(DI)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ $REDMASK51,DX
-        SHLQ $13,CX:SI
-        ANDQ DX,SI
-        SHLQ $13,R9:R8
-        ANDQ DX,R8
-        ADDQ CX,R8
-        SHLQ $13,R11:R10
-        ANDQ DX,R10
-        ADDQ R9,R10
-        SHLQ $13,R13:R12
-        ANDQ DX,R12
-        ADDQ R11,R12
-        SHLQ $13,R15:R14
-        ANDQ DX,R14
-        ADDQ R13,R14
-        IMUL3Q $19,R15,CX
-        ADDQ CX,SI
-        MOVQ SI,CX
-        SHRQ $51,CX
-        ADDQ R8,CX
-        ANDQ DX,SI
-        MOVQ CX,R8
-        SHRQ $51,CX
-        ADDQ R10,CX
-        ANDQ DX,R8
-        MOVQ CX,R9
-        SHRQ $51,CX
-        ADDQ R12,CX
-        ANDQ DX,R9
-        MOVQ CX,AX
-        SHRQ $51,CX
-        ADDQ R14,CX
-        ANDQ DX,AX
-        MOVQ CX,R10
-        SHRQ $51,CX
-        IMUL3Q $19,CX,CX
-        ADDQ CX,SI
-        ANDQ DX,R10
-        MOVQ SI,120(DI)
-        MOVQ R8,128(DI)
-        MOVQ R9,136(DI)
-        MOVQ AX,144(DI)
-        MOVQ R10,152(DI)
-        MOVQ 160(DI),AX
-        MULQ 160(DI)
-        MOVQ AX,SI
-        MOVQ DX,CX
-        MOVQ 160(DI),AX
-        SHLQ $1,AX
-        MULQ 168(DI)
-        MOVQ AX,R8
-        MOVQ DX,R9
-        MOVQ 160(DI),AX
-        SHLQ $1,AX
-        MULQ 176(DI)
-        MOVQ AX,R10
-        MOVQ DX,R11
-        MOVQ 160(DI),AX
-        SHLQ $1,AX
-        MULQ 184(DI)
-        MOVQ AX,R12
-        MOVQ DX,R13
-        MOVQ 160(DI),AX
-        SHLQ $1,AX
-        MULQ 192(DI)
-        MOVQ AX,R14
-        MOVQ DX,R15
-        MOVQ 168(DI),AX
-        MULQ 168(DI)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 168(DI),AX
-        SHLQ $1,AX
-        MULQ 176(DI)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 168(DI),AX
-        SHLQ $1,AX
-        MULQ 184(DI)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 168(DI),DX
-        IMUL3Q $38,DX,AX
-        MULQ 192(DI)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 176(DI),AX
-        MULQ 176(DI)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 176(DI),DX
-        IMUL3Q $38,DX,AX
-        MULQ 184(DI)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 176(DI),DX
-        IMUL3Q $38,DX,AX
-        MULQ 192(DI)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 184(DI),DX
-        IMUL3Q $19,DX,AX
-        MULQ 184(DI)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 184(DI),DX
-        IMUL3Q $38,DX,AX
-        MULQ 192(DI)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 192(DI),DX
-        IMUL3Q $19,DX,AX
-        MULQ 192(DI)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ $REDMASK51,DX
-        SHLQ $13,CX:SI
-        ANDQ DX,SI
-        SHLQ $13,R9:R8
-        ANDQ DX,R8
-        ADDQ CX,R8
-        SHLQ $13,R11:R10
-        ANDQ DX,R10
-        ADDQ R9,R10
-        SHLQ $13,R13:R12
-        ANDQ DX,R12
-        ADDQ R11,R12
-        SHLQ $13,R15:R14
-        ANDQ DX,R14
-        ADDQ R13,R14
-        IMUL3Q $19,R15,CX
-        ADDQ CX,SI
-        MOVQ SI,CX
-        SHRQ $51,CX
-        ADDQ R8,CX
-        ANDQ DX,SI
-        MOVQ CX,R8
-        SHRQ $51,CX
-        ADDQ R10,CX
-        ANDQ DX,R8
-        MOVQ CX,R9
-        SHRQ $51,CX
-        ADDQ R12,CX
-        ANDQ DX,R9
-        MOVQ CX,AX
-        SHRQ $51,CX
-        ADDQ R14,CX
-        ANDQ DX,AX
-        MOVQ CX,R10
-        SHRQ $51,CX
-        IMUL3Q $19,CX,CX
-        ADDQ CX,SI
-        ANDQ DX,R10
-        MOVQ SI,160(DI)
-        MOVQ R8,168(DI)
-        MOVQ R9,176(DI)
-        MOVQ AX,184(DI)
-        MOVQ R10,192(DI)
-        MOVQ 184(DI),SI
-        IMUL3Q $19,SI,AX
-        MOVQ AX,0(SP)
-        MULQ 16(DI)
-        MOVQ AX,SI
-        MOVQ DX,CX
-        MOVQ 192(DI),DX
-        IMUL3Q $19,DX,AX
-        MOVQ AX,8(SP)
-        MULQ 8(DI)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 160(DI),AX
-        MULQ 0(DI)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 160(DI),AX
-        MULQ 8(DI)
-        MOVQ AX,R8
-        MOVQ DX,R9
-        MOVQ 160(DI),AX
-        MULQ 16(DI)
-        MOVQ AX,R10
-        MOVQ DX,R11
-        MOVQ 160(DI),AX
-        MULQ 24(DI)
-        MOVQ AX,R12
-        MOVQ DX,R13
-        MOVQ 160(DI),AX
-        MULQ 32(DI)
-        MOVQ AX,R14
-        MOVQ DX,R15
-        MOVQ 168(DI),AX
-        MULQ 0(DI)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 168(DI),AX
-        MULQ 8(DI)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 168(DI),AX
-        MULQ 16(DI)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 168(DI),AX
-        MULQ 24(DI)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 168(DI),DX
-        IMUL3Q $19,DX,AX
-        MULQ 32(DI)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 176(DI),AX
-        MULQ 0(DI)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 176(DI),AX
-        MULQ 8(DI)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 176(DI),AX
-        MULQ 16(DI)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 176(DI),DX
-        IMUL3Q $19,DX,AX
-        MULQ 24(DI)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 176(DI),DX
-        IMUL3Q $19,DX,AX
-        MULQ 32(DI)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 184(DI),AX
-        MULQ 0(DI)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 184(DI),AX
-        MULQ 8(DI)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 0(SP),AX
-        MULQ 24(DI)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 0(SP),AX
-        MULQ 32(DI)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 192(DI),AX
-        MULQ 0(DI)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 8(SP),AX
-        MULQ 16(DI)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 8(SP),AX
-        MULQ 24(DI)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 8(SP),AX
-        MULQ 32(DI)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ $REDMASK51,DX
-        SHLQ $13,CX:SI
-        ANDQ DX,SI
-        SHLQ $13,R9:R8
-        ANDQ DX,R8
-        ADDQ CX,R8
-        SHLQ $13,R11:R10
-        ANDQ DX,R10
-        ADDQ R9,R10
-        SHLQ $13,R13:R12
-        ANDQ DX,R12
-        ADDQ R11,R12
-        SHLQ $13,R15:R14
-        ANDQ DX,R14
-        ADDQ R13,R14
-        IMUL3Q $19,R15,CX
-        ADDQ CX,SI
-        MOVQ SI,CX
-        SHRQ $51,CX
-        ADDQ R8,CX
-        MOVQ CX,R8
-        SHRQ $51,CX
-        ANDQ DX,SI
-        ADDQ R10,CX
-        MOVQ CX,R9
-        SHRQ $51,CX
-        ANDQ DX,R8
-        ADDQ R12,CX
-        MOVQ CX,AX
-        SHRQ $51,CX
-        ANDQ DX,R9
-        ADDQ R14,CX
-        MOVQ CX,R10
-        SHRQ $51,CX
-        ANDQ DX,AX
-        IMUL3Q $19,CX,CX
-        ADDQ CX,SI
-        ANDQ DX,R10
-        MOVQ SI,160(DI)
-        MOVQ R8,168(DI)
-        MOVQ R9,176(DI)
-        MOVQ AX,184(DI)
-        MOVQ R10,192(DI)
-        MOVQ 144(SP),SI
-        IMUL3Q $19,SI,AX
-        MOVQ AX,0(SP)
-        MULQ 96(SP)
-        MOVQ AX,SI
-        MOVQ DX,CX
-        MOVQ 152(SP),DX
-        IMUL3Q $19,DX,AX
-        MOVQ AX,8(SP)
-        MULQ 88(SP)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 120(SP),AX
-        MULQ 80(SP)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 120(SP),AX
-        MULQ 88(SP)
-        MOVQ AX,R8
-        MOVQ DX,R9
-        MOVQ 120(SP),AX
-        MULQ 96(SP)
-        MOVQ AX,R10
-        MOVQ DX,R11
-        MOVQ 120(SP),AX
-        MULQ 104(SP)
-        MOVQ AX,R12
-        MOVQ DX,R13
-        MOVQ 120(SP),AX
-        MULQ 112(SP)
-        MOVQ AX,R14
-        MOVQ DX,R15
-        MOVQ 128(SP),AX
-        MULQ 80(SP)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 128(SP),AX
-        MULQ 88(SP)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 128(SP),AX
-        MULQ 96(SP)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 128(SP),AX
-        MULQ 104(SP)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 128(SP),DX
-        IMUL3Q $19,DX,AX
-        MULQ 112(SP)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 136(SP),AX
-        MULQ 80(SP)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 136(SP),AX
-        MULQ 88(SP)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 136(SP),AX
-        MULQ 96(SP)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 136(SP),DX
-        IMUL3Q $19,DX,AX
-        MULQ 104(SP)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 136(SP),DX
-        IMUL3Q $19,DX,AX
-        MULQ 112(SP)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 144(SP),AX
-        MULQ 80(SP)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 144(SP),AX
-        MULQ 88(SP)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 0(SP),AX
-        MULQ 104(SP)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 0(SP),AX
-        MULQ 112(SP)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 152(SP),AX
-        MULQ 80(SP)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 8(SP),AX
-        MULQ 96(SP)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 8(SP),AX
-        MULQ 104(SP)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 8(SP),AX
-        MULQ 112(SP)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ $REDMASK51,DX
-        SHLQ $13,CX:SI
-        ANDQ DX,SI
-        SHLQ $13,R9:R8
-        ANDQ DX,R8
-        ADDQ CX,R8
-        SHLQ $13,R11:R10
-        ANDQ DX,R10
-        ADDQ R9,R10
-        SHLQ $13,R13:R12
-        ANDQ DX,R12
-        ADDQ R11,R12
-        SHLQ $13,R15:R14
-        ANDQ DX,R14
-        ADDQ R13,R14
-        IMUL3Q $19,R15,CX
-        ADDQ CX,SI
-        MOVQ SI,CX
-        SHRQ $51,CX
-        ADDQ R8,CX
-        MOVQ CX,R8
-        SHRQ $51,CX
-        ANDQ DX,SI
-        ADDQ R10,CX
-        MOVQ CX,R9
-        SHRQ $51,CX
-        ANDQ DX,R8
-        ADDQ R12,CX
-        MOVQ CX,AX
-        SHRQ $51,CX
-        ANDQ DX,R9
-        ADDQ R14,CX
-        MOVQ CX,R10
-        SHRQ $51,CX
-        ANDQ DX,AX
-        IMUL3Q $19,CX,CX
-        ADDQ CX,SI
-        ANDQ DX,R10
-        MOVQ SI,40(DI)
-        MOVQ R8,48(DI)
-        MOVQ R9,56(DI)
-        MOVQ AX,64(DI)
-        MOVQ R10,72(DI)
-        MOVQ 160(SP),AX
-        MULQ ·_121666_213(SB)
-        SHRQ $13,AX
-        MOVQ AX,SI
-        MOVQ DX,CX
-        MOVQ 168(SP),AX
-        MULQ ·_121666_213(SB)
-        SHRQ $13,AX
-        ADDQ AX,CX
-        MOVQ DX,R8
-        MOVQ 176(SP),AX
-        MULQ ·_121666_213(SB)
-        SHRQ $13,AX
-        ADDQ AX,R8
-        MOVQ DX,R9
-        MOVQ 184(SP),AX
-        MULQ ·_121666_213(SB)
-        SHRQ $13,AX
-        ADDQ AX,R9
-        MOVQ DX,R10
-        MOVQ 192(SP),AX
-        MULQ ·_121666_213(SB)
-        SHRQ $13,AX
-        ADDQ AX,R10
-        IMUL3Q $19,DX,DX
-        ADDQ DX,SI
-        ADDQ 80(SP),SI
-        ADDQ 88(SP),CX
-        ADDQ 96(SP),R8
-        ADDQ 104(SP),R9
-        ADDQ 112(SP),R10
-        MOVQ SI,80(DI)
-        MOVQ CX,88(DI)
-        MOVQ R8,96(DI)
-        MOVQ R9,104(DI)
-        MOVQ R10,112(DI)
-        MOVQ 104(DI),SI
-        IMUL3Q $19,SI,AX
-        MOVQ AX,0(SP)
-        MULQ 176(SP)
-        MOVQ AX,SI
-        MOVQ DX,CX
-        MOVQ 112(DI),DX
-        IMUL3Q $19,DX,AX
-        MOVQ AX,8(SP)
-        MULQ 168(SP)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 80(DI),AX
-        MULQ 160(SP)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 80(DI),AX
-        MULQ 168(SP)
-        MOVQ AX,R8
-        MOVQ DX,R9
-        MOVQ 80(DI),AX
-        MULQ 176(SP)
-        MOVQ AX,R10
-        MOVQ DX,R11
-        MOVQ 80(DI),AX
-        MULQ 184(SP)
-        MOVQ AX,R12
-        MOVQ DX,R13
-        MOVQ 80(DI),AX
-        MULQ 192(SP)
-        MOVQ AX,R14
-        MOVQ DX,R15
-        MOVQ 88(DI),AX
-        MULQ 160(SP)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 88(DI),AX
-        MULQ 168(SP)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 88(DI),AX
-        MULQ 176(SP)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 88(DI),AX
-        MULQ 184(SP)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 88(DI),DX
-        IMUL3Q $19,DX,AX
-        MULQ 192(SP)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 96(DI),AX
-        MULQ 160(SP)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 96(DI),AX
-        MULQ 168(SP)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 96(DI),AX
-        MULQ 176(SP)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 96(DI),DX
-        IMUL3Q $19,DX,AX
-        MULQ 184(SP)
-        ADDQ AX,SI
-        ADCQ DX,CX
-        MOVQ 96(DI),DX
-        IMUL3Q $19,DX,AX
-        MULQ 192(SP)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 104(DI),AX
-        MULQ 160(SP)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 104(DI),AX
-        MULQ 168(SP)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 0(SP),AX
-        MULQ 184(SP)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 0(SP),AX
-        MULQ 192(SP)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 112(DI),AX
-        MULQ 160(SP)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 8(SP),AX
-        MULQ 176(SP)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 8(SP),AX
-        MULQ 184(SP)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 8(SP),AX
-        MULQ 192(SP)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ $REDMASK51,DX
-        SHLQ $13,CX:SI
-        ANDQ DX,SI
-        SHLQ $13,R9:R8
-        ANDQ DX,R8
-        ADDQ CX,R8
-        SHLQ $13,R11:R10
-        ANDQ DX,R10
-        ADDQ R9,R10
-        SHLQ $13,R13:R12
-        ANDQ DX,R12
-        ADDQ R11,R12
-        SHLQ $13,R15:R14
-        ANDQ DX,R14
-        ADDQ R13,R14
-        IMUL3Q $19,R15,CX
-        ADDQ CX,SI
-        MOVQ SI,CX
-        SHRQ $51,CX
-        ADDQ R8,CX
-        MOVQ CX,R8
-        SHRQ $51,CX
-        ANDQ DX,SI
-        ADDQ R10,CX
-        MOVQ CX,R9
-        SHRQ $51,CX
-        ANDQ DX,R8
-        ADDQ R12,CX
-        MOVQ CX,AX
-        SHRQ $51,CX
-        ANDQ DX,R9
-        ADDQ R14,CX
-        MOVQ CX,R10
-        SHRQ $51,CX
-        ANDQ DX,AX
-        IMUL3Q $19,CX,CX
-        ADDQ CX,SI
-        ANDQ DX,R10
-        MOVQ SI,80(DI)
-        MOVQ R8,88(DI)
-        MOVQ R9,96(DI)
-        MOVQ AX,104(DI)
-        MOVQ R10,112(DI)
-        RET
diff --git a/vendor/golang.org/x/crypto/curve25519/mont25519_amd64.go b/vendor/golang.org/x/crypto/curve25519/mont25519_amd64.go
deleted file mode 100644
index 5822bd5..0000000
--- a/vendor/golang.org/x/crypto/curve25519/mont25519_amd64.go
+++ /dev/null
@@ -1,240 +0,0 @@
-// 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.
-
-// +build amd64,!gccgo,!appengine
-
-package curve25519
-
-// These functions are implemented in the .s files. The names of the functions
-// in the rest of the file are also taken from the SUPERCOP sources to help
-// people following along.
-
-//go:noescape
-
-func cswap(inout *[5]uint64, v uint64)
-
-//go:noescape
-
-func ladderstep(inout *[5][5]uint64)
-
-//go:noescape
-
-func freeze(inout *[5]uint64)
-
-//go:noescape
-
-func mul(dest, a, b *[5]uint64)
-
-//go:noescape
-
-func square(out, in *[5]uint64)
-
-// mladder uses a Montgomery ladder to calculate (xr/zr) *= s.
-func mladder(xr, zr *[5]uint64, s *[32]byte) {
-        var work [5][5]uint64
-
-        work[0] = *xr
-        setint(&work[1], 1)
-        setint(&work[2], 0)
-        work[3] = *xr
-        setint(&work[4], 1)
-
-        j := uint(6)
-        var prevbit byte
-
-        for i := 31; i >= 0; i-- {
-                for j < 8 {
-                        bit := ((*s)[i] >> j) & 1
-                        swap := bit ^ prevbit
-                        prevbit = bit
-                        cswap(&work[1], uint64(swap))
-                        ladderstep(&work)
-                        j--
-                }
-                j = 7
-        }
-
-        *xr = work[1]
-        *zr = work[2]
-}
-
-func scalarMult(out, in, base *[32]byte) {
-        var e [32]byte
-        copy(e[:], (*in)[:])
-        e[0] &= 248
-        e[31] &= 127
-        e[31] |= 64
-
-        var t, z [5]uint64
-        unpack(&t, base)
-        mladder(&t, &z, &e)
-        invert(&z, &z)
-        mul(&t, &t, &z)
-        pack(out, &t)
-}
-
-func setint(r *[5]uint64, v uint64) {
-        r[0] = v
-        r[1] = 0
-        r[2] = 0
-        r[3] = 0
-        r[4] = 0
-}
-
-// unpack sets r = x where r consists of 5, 51-bit limbs in little-endian
-// order.
-func unpack(r *[5]uint64, x *[32]byte) {
-        r[0] = uint64(x[0]) |
-                uint64(x[1])<<8 |
-                uint64(x[2])<<16 |
-                uint64(x[3])<<24 |
-                uint64(x[4])<<32 |
-                uint64(x[5])<<40 |
-                uint64(x[6]&7)<<48
-
-        r[1] = uint64(x[6])>>3 |
-                uint64(x[7])<<5 |
-                uint64(x[8])<<13 |
-                uint64(x[9])<<21 |
-                uint64(x[10])<<29 |
-                uint64(x[11])<<37 |
-                uint64(x[12]&63)<<45
-
-        r[2] = uint64(x[12])>>6 |
-                uint64(x[13])<<2 |
-                uint64(x[14])<<10 |
-                uint64(x[15])<<18 |
-                uint64(x[16])<<26 |
-                uint64(x[17])<<34 |
-                uint64(x[18])<<42 |
-                uint64(x[19]&1)<<50
-
-        r[3] = uint64(x[19])>>1 |
-                uint64(x[20])<<7 |
-                uint64(x[21])<<15 |
-                uint64(x[22])<<23 |
-                uint64(x[23])<<31 |
-                uint64(x[24])<<39 |
-                uint64(x[25]&15)<<47
-
-        r[4] = uint64(x[25])>>4 |
-                uint64(x[26])<<4 |
-                uint64(x[27])<<12 |
-                uint64(x[28])<<20 |
-                uint64(x[29])<<28 |
-                uint64(x[30])<<36 |
-                uint64(x[31]&127)<<44
-}
-
-// pack sets out = x where out is the usual, little-endian form of the 5,
-// 51-bit limbs in x.
-func pack(out *[32]byte, x *[5]uint64) {
-        t := *x
-        freeze(&t)
-
-        out[0] = byte(t[0])
-        out[1] = byte(t[0] >> 8)
-        out[2] = byte(t[0] >> 16)
-        out[3] = byte(t[0] >> 24)
-        out[4] = byte(t[0] >> 32)
-        out[5] = byte(t[0] >> 40)
-        out[6] = byte(t[0] >> 48)
-
-        out[6] ^= byte(t[1]<<3) & 0xf8
-        out[7] = byte(t[1] >> 5)
-        out[8] = byte(t[1] >> 13)
-        out[9] = byte(t[1] >> 21)
-        out[10] = byte(t[1] >> 29)
-        out[11] = byte(t[1] >> 37)
-        out[12] = byte(t[1] >> 45)
-
-        out[12] ^= byte(t[2]<<6) & 0xc0
-        out[13] = byte(t[2] >> 2)
-        out[14] = byte(t[2] >> 10)
-        out[15] = byte(t[2] >> 18)
-        out[16] = byte(t[2] >> 26)
-        out[17] = byte(t[2] >> 34)
-        out[18] = byte(t[2] >> 42)
-        out[19] = byte(t[2] >> 50)
-
-        out[19] ^= byte(t[3]<<1) & 0xfe
-        out[20] = byte(t[3] >> 7)
-        out[21] = byte(t[3] >> 15)
-        out[22] = byte(t[3] >> 23)
-        out[23] = byte(t[3] >> 31)
-        out[24] = byte(t[3] >> 39)
-        out[25] = byte(t[3] >> 47)
-
-        out[25] ^= byte(t[4]<<4) & 0xf0
-        out[26] = byte(t[4] >> 4)
-        out[27] = byte(t[4] >> 12)
-        out[28] = byte(t[4] >> 20)
-        out[29] = byte(t[4] >> 28)
-        out[30] = byte(t[4] >> 36)
-        out[31] = byte(t[4] >> 44)
-}
-
-// invert calculates r = x^-1 mod p using Fermat's little theorem.
-func invert(r *[5]uint64, x *[5]uint64) {
-        var z2, z9, z11, z2_5_0, z2_10_0, z2_20_0, z2_50_0, z2_100_0, t [5]uint64
-
-        square(&z2, x)        /* 2 */
-        square(&t, &z2)       /* 4 */
-        square(&t, &t)        /* 8 */
-        mul(&z9, &t, x)       /* 9 */
-        mul(&z11, &z9, &z2)   /* 11 */
-        square(&t, &z11)      /* 22 */
-        mul(&z2_5_0, &t, &z9) /* 2^5 - 2^0 = 31 */
-
-        square(&t, &z2_5_0)      /* 2^6 - 2^1 */
-        for i := 1; i < 5; i++ { /* 2^20 - 2^10 */
-                square(&t, &t)
-        }
-        mul(&z2_10_0, &t, &z2_5_0) /* 2^10 - 2^0 */
-
-        square(&t, &z2_10_0)      /* 2^11 - 2^1 */
-        for i := 1; i < 10; i++ { /* 2^20 - 2^10 */
-                square(&t, &t)
-        }
-        mul(&z2_20_0, &t, &z2_10_0) /* 2^20 - 2^0 */
-
-        square(&t, &z2_20_0)      /* 2^21 - 2^1 */
-        for i := 1; i < 20; i++ { /* 2^40 - 2^20 */
-                square(&t, &t)
-        }
-        mul(&t, &t, &z2_20_0) /* 2^40 - 2^0 */
-
-        square(&t, &t)            /* 2^41 - 2^1 */
-        for i := 1; i < 10; i++ { /* 2^50 - 2^10 */
-                square(&t, &t)
-        }
-        mul(&z2_50_0, &t, &z2_10_0) /* 2^50 - 2^0 */
-
-        square(&t, &z2_50_0)      /* 2^51 - 2^1 */
-        for i := 1; i < 50; i++ { /* 2^100 - 2^50 */
-                square(&t, &t)
-        }
-        mul(&z2_100_0, &t, &z2_50_0) /* 2^100 - 2^0 */
-
-        square(&t, &z2_100_0)      /* 2^101 - 2^1 */
-        for i := 1; i < 100; i++ { /* 2^200 - 2^100 */
-                square(&t, &t)
-        }
-        mul(&t, &t, &z2_100_0) /* 2^200 - 2^0 */
-
-        square(&t, &t)            /* 2^201 - 2^1 */
-        for i := 1; i < 50; i++ { /* 2^250 - 2^50 */
-                square(&t, &t)
-        }
-        mul(&t, &t, &z2_50_0) /* 2^250 - 2^0 */
-
-        square(&t, &t) /* 2^251 - 2^1 */
-        square(&t, &t) /* 2^252 - 2^2 */
-        square(&t, &t) /* 2^253 - 2^3 */
-
-        square(&t, &t) /* 2^254 - 2^4 */
-
-        square(&t, &t)   /* 2^255 - 2^5 */
-        mul(r, &t, &z11) /* 2^255 - 21 */
-}
diff --git a/vendor/golang.org/x/crypto/curve25519/mul_amd64.s b/vendor/golang.org/x/crypto/curve25519/mul_amd64.s
deleted file mode 100644
index b162e65..0000000
--- a/vendor/golang.org/x/crypto/curve25519/mul_amd64.s
+++ /dev/null
@@ -1,169 +0,0 @@
-// 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.
-
-// This code was translated into a form compatible with 6a from the public
-// domain sources in SUPERCOP: http://bench.cr.yp.to/supercop.html
-
-// +build amd64,!gccgo,!appengine
-
-#include "const_amd64.h"
-
-// func mul(dest, a, b *[5]uint64)
-TEXT ·mul(SB),0,$16-24
-        MOVQ dest+0(FP), DI
-        MOVQ a+8(FP), SI
-        MOVQ b+16(FP), DX
-
-        MOVQ DX,CX
-        MOVQ 24(SI),DX
-        IMUL3Q $19,DX,AX
-        MOVQ AX,0(SP)
-        MULQ 16(CX)
-        MOVQ AX,R8
-        MOVQ DX,R9
-        MOVQ 32(SI),DX
-        IMUL3Q $19,DX,AX
-        MOVQ AX,8(SP)
-        MULQ 8(CX)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 0(SI),AX
-        MULQ 0(CX)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 0(SI),AX
-        MULQ 8(CX)
-        MOVQ AX,R10
-        MOVQ DX,R11
-        MOVQ 0(SI),AX
-        MULQ 16(CX)
-        MOVQ AX,R12
-        MOVQ DX,R13
-        MOVQ 0(SI),AX
-        MULQ 24(CX)
-        MOVQ AX,R14
-        MOVQ DX,R15
-        MOVQ 0(SI),AX
-        MULQ 32(CX)
-        MOVQ AX,BX
-        MOVQ DX,BP
-        MOVQ 8(SI),AX
-        MULQ 0(CX)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 8(SI),AX
-        MULQ 8(CX)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 8(SI),AX
-        MULQ 16(CX)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 8(SI),AX
-        MULQ 24(CX)
-        ADDQ AX,BX
-        ADCQ DX,BP
-        MOVQ 8(SI),DX
-        IMUL3Q $19,DX,AX
-        MULQ 32(CX)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 16(SI),AX
-        MULQ 0(CX)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 16(SI),AX
-        MULQ 8(CX)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 16(SI),AX
-        MULQ 16(CX)
-        ADDQ AX,BX
-        ADCQ DX,BP
-        MOVQ 16(SI),DX
-        IMUL3Q $19,DX,AX
-        MULQ 24(CX)
-        ADDQ AX,R8
-        ADCQ DX,R9
-        MOVQ 16(SI),DX
-        IMUL3Q $19,DX,AX
-        MULQ 32(CX)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 24(SI),AX
-        MULQ 0(CX)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ 24(SI),AX
-        MULQ 8(CX)
-        ADDQ AX,BX
-        ADCQ DX,BP
-        MOVQ 0(SP),AX
-        MULQ 24(CX)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 0(SP),AX
-        MULQ 32(CX)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 32(SI),AX
-        MULQ 0(CX)
-        ADDQ AX,BX
-        ADCQ DX,BP
-        MOVQ 8(SP),AX
-        MULQ 16(CX)
-        ADDQ AX,R10
-        ADCQ DX,R11
-        MOVQ 8(SP),AX
-        MULQ 24(CX)
-        ADDQ AX,R12
-        ADCQ DX,R13
-        MOVQ 8(SP),AX
-        MULQ 32(CX)
-        ADDQ AX,R14
-        ADCQ DX,R15
-        MOVQ $REDMASK51,SI
-        SHLQ $13,R9:R8
-        ANDQ SI,R8
-        SHLQ $13,R11:R10
-        ANDQ SI,R10
-        ADDQ R9,R10
-        SHLQ $13,R13:R12
-        ANDQ SI,R12
-        ADDQ R11,R12
-        SHLQ $13,R15:R14
-        ANDQ SI,R14
-        ADDQ R13,R14
-        SHLQ $13,BP:BX
-        ANDQ SI,BX
-        ADDQ R15,BX
-        IMUL3Q $19,BP,DX
-        ADDQ DX,R8
-        MOVQ R8,DX
-        SHRQ $51,DX
-        ADDQ R10,DX
-        MOVQ DX,CX
-        SHRQ $51,DX
-        ANDQ SI,R8
-        ADDQ R12,DX
-        MOVQ DX,R9
-        SHRQ $51,DX
-        ANDQ SI,CX
-        ADDQ R14,DX
-        MOVQ DX,AX
-        SHRQ $51,DX
-        ANDQ SI,R9
-        ADDQ BX,DX
-        MOVQ DX,R10
-        SHRQ $51,DX
-        ANDQ SI,AX
-        IMUL3Q $19,DX,DX
-        ADDQ DX,R8
-        ANDQ SI,R10
-        MOVQ R8,0(DI)
-        MOVQ CX,8(DI)
-        MOVQ R9,16(DI)
-        MOVQ AX,24(DI)
-        MOVQ R10,32(DI)
-        RET
diff --git a/vendor/golang.org/x/crypto/curve25519/square_amd64.s b/vendor/golang.org/x/crypto/curve25519/square_amd64.s
deleted file mode 100644
index 4e864a8..0000000
--- a/vendor/golang.org/x/crypto/curve25519/square_amd64.s
+++ /dev/null
@@ -1,132 +0,0 @@
-// 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.
-
-// This code was translated into a form compatible with 6a from the public
-// domain sources in SUPERCOP: http://bench.cr.yp.to/supercop.html
-
-// +build amd64,!gccgo,!appengine
-
-#include "const_amd64.h"
-
-// func square(out, in *[5]uint64)
-TEXT ·square(SB),7,$0-16
-        MOVQ out+0(FP), DI
-        MOVQ in+8(FP), SI
-
-        MOVQ 0(SI),AX
-        MULQ 0(SI)
-        MOVQ AX,CX
-        MOVQ DX,R8
-        MOVQ 0(SI),AX
-        SHLQ $1,AX
-        MULQ 8(SI)
-        MOVQ AX,R9
-        MOVQ DX,R10
-        MOVQ 0(SI),AX
-        SHLQ $1,AX
-        MULQ 16(SI)
-        MOVQ AX,R11
-        MOVQ DX,R12
-        MOVQ 0(SI),AX
-        SHLQ $1,AX
-        MULQ 24(SI)
-        MOVQ AX,R13
-        MOVQ DX,R14
-        MOVQ 0(SI),AX
-        SHLQ $1,AX
-        MULQ 32(SI)
-        MOVQ AX,R15
-        MOVQ DX,BX
-        MOVQ 8(SI),AX
-        MULQ 8(SI)
-        ADDQ AX,R11
-        ADCQ DX,R12
-        MOVQ 8(SI),AX
-        SHLQ $1,AX
-        MULQ 16(SI)
-        ADDQ AX,R13
-        ADCQ DX,R14
-        MOVQ 8(SI),AX
-        SHLQ $1,AX
-        MULQ 24(SI)
-        ADDQ AX,R15
-        ADCQ DX,BX
-        MOVQ 8(SI),DX
-        IMUL3Q $38,DX,AX
-        MULQ 32(SI)
-        ADDQ AX,CX
-        ADCQ DX,R8
-        MOVQ 16(SI),AX
-        MULQ 16(SI)
-        ADDQ AX,R15
-        ADCQ DX,BX
-        MOVQ 16(SI),DX
-        IMUL3Q $38,DX,AX
-        MULQ 24(SI)
-        ADDQ AX,CX
-        ADCQ DX,R8
-        MOVQ 16(SI),DX
-        IMUL3Q $38,DX,AX
-        MULQ 32(SI)
-        ADDQ AX,R9
-        ADCQ DX,R10
-        MOVQ 24(SI),DX
-        IMUL3Q $19,DX,AX
-        MULQ 24(SI)
-        ADDQ AX,R9
-        ADCQ DX,R10
-        MOVQ 24(SI),DX
-        IMUL3Q $38,DX,AX
-        MULQ 32(SI)
-        ADDQ AX,R11
-        ADCQ DX,R12
-        MOVQ 32(SI),DX
-        IMUL3Q $19,DX,AX
-        MULQ 32(SI)
-        ADDQ AX,R13
-        ADCQ DX,R14
-        MOVQ $REDMASK51,SI
-        SHLQ $13,R8:CX
-        ANDQ SI,CX
-        SHLQ $13,R10:R9
-        ANDQ SI,R9
-        ADDQ R8,R9
-        SHLQ $13,R12:R11
-        ANDQ SI,R11
-        ADDQ R10,R11
-        SHLQ $13,R14:R13
-        ANDQ SI,R13
-        ADDQ R12,R13
-        SHLQ $13,BX:R15
-        ANDQ SI,R15
-        ADDQ R14,R15
-        IMUL3Q $19,BX,DX
-        ADDQ DX,CX
-        MOVQ CX,DX
-        SHRQ $51,DX
-        ADDQ R9,DX
-        ANDQ SI,CX
-        MOVQ DX,R8
-        SHRQ $51,DX
-        ADDQ R11,DX
-        ANDQ SI,R8
-        MOVQ DX,R9
-        SHRQ $51,DX
-        ADDQ R13,DX
-        ANDQ SI,R9
-        MOVQ DX,AX
-        SHRQ $51,DX
-        ADDQ R15,DX
-        ANDQ SI,AX
-        MOVQ DX,R10
-        SHRQ $51,DX
-        IMUL3Q $19,DX,DX
-        ADDQ DX,CX
-        ANDQ SI,R10
-        MOVQ CX,0(DI)
-        MOVQ R8,8(DI)
-        MOVQ R9,16(DI)
-        MOVQ AX,24(DI)
-        MOVQ R10,32(DI)
-        RET
diff --git a/vendor/golang.org/x/crypto/ed25519/ed25519.go b/vendor/golang.org/x/crypto/ed25519/ed25519.go
deleted file mode 100644
index f1d9567..0000000
--- a/vendor/golang.org/x/crypto/ed25519/ed25519.go
+++ /dev/null
@@ -1,181 +0,0 @@
-// Copyright 2016 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 ed25519 implements the Ed25519 signature algorithm. See
-// http://ed25519.cr.yp.to/.
-//
-// These functions are also compatible with the “Ed25519” function defined in
-// https://tools.ietf.org/html/draft-irtf-cfrg-eddsa-05.
-package ed25519
-
-// This code is a port of the public domain, “ref10” implementation of ed25519
-// from SUPERCOP.
-
-import (
-        "crypto"
-        cryptorand "crypto/rand"
-        "crypto/sha512"
-        "crypto/subtle"
-        "errors"
-        "io"
-        "strconv"
-
-        "golang.org/x/crypto/ed25519/internal/edwards25519"
-)
-
-const (
-        // PublicKeySize is the size, in bytes, of public keys as used in this package.
-        PublicKeySize = 32
-        // PrivateKeySize is the size, in bytes, of private keys as used in this package.
-        PrivateKeySize = 64
-        // SignatureSize is the size, in bytes, of signatures generated and verified by this package.
-        SignatureSize = 64
-)
-
-// PublicKey is the type of Ed25519 public keys.
-type PublicKey []byte
-
-// PrivateKey is the type of Ed25519 private keys. It implements crypto.Signer.
-type PrivateKey []byte
-
-// Public returns the PublicKey corresponding to priv.
-func (priv PrivateKey) Public() crypto.PublicKey {
-        publicKey := make([]byte, PublicKeySize)
-        copy(publicKey, priv[32:])
-        return PublicKey(publicKey)
-}
-
-// Sign signs the given message with priv.
-// Ed25519 performs two passes over messages to be signed and therefore cannot
-// handle pre-hashed messages. Thus opts.HashFunc() must return zero to
-// indicate the message hasn't been hashed. This can be achieved by passing
-// crypto.Hash(0) as the value for opts.
-func (priv PrivateKey) Sign(rand io.Reader, message []byte, opts crypto.SignerOpts) (signature []byte, err error) {
-        if opts.HashFunc() != crypto.Hash(0) {
-                return nil, errors.New("ed25519: cannot sign hashed message")
-        }
-
-        return Sign(priv, message), nil
-}
-
-// GenerateKey generates a public/private key pair using entropy from rand.
-// If rand is nil, crypto/rand.Reader will be used.
-func GenerateKey(rand io.Reader) (publicKey PublicKey, privateKey PrivateKey, err error) {
-        if rand == nil {
-                rand = cryptorand.Reader
-        }
-
-        privateKey = make([]byte, PrivateKeySize)
-        publicKey = make([]byte, PublicKeySize)
-        _, err = io.ReadFull(rand, privateKey[:32])
-        if err != nil {
-                return nil, nil, err
-        }
-
-        digest := sha512.Sum512(privateKey[:32])
-        digest[0] &= 248
-        digest[31] &= 127
-        digest[31] |= 64
-
-        var A edwards25519.ExtendedGroupElement
-        var hBytes [32]byte
-        copy(hBytes[:], digest[:])
-        edwards25519.GeScalarMultBase(&A, &hBytes)
-        var publicKeyBytes [32]byte
-        A.ToBytes(&publicKeyBytes)
-
-        copy(privateKey[32:], publicKeyBytes[:])
-        copy(publicKey, publicKeyBytes[:])
-
-        return publicKey, privateKey, nil
-}
-
-// Sign signs the message with privateKey and returns a signature. It will
-// panic if len(privateKey) is not PrivateKeySize.
-func Sign(privateKey PrivateKey, message []byte) []byte {
-        if l := len(privateKey); l != PrivateKeySize {
-                panic("ed25519: bad private key length: " + strconv.Itoa(l))
-        }
-
-        h := sha512.New()
-        h.Write(privateKey[:32])
-
-        var digest1, messageDigest, hramDigest [64]byte
-        var expandedSecretKey [32]byte
-        h.Sum(digest1[:0])
-        copy(expandedSecretKey[:], digest1[:])
-        expandedSecretKey[0] &= 248
-        expandedSecretKey[31] &= 63
-        expandedSecretKey[31] |= 64
-
-        h.Reset()
-        h.Write(digest1[32:])
-        h.Write(message)
-        h.Sum(messageDigest[:0])
-
-        var messageDigestReduced [32]byte
-        edwards25519.ScReduce(&messageDigestReduced, &messageDigest)
-        var R edwards25519.ExtendedGroupElement
-        edwards25519.GeScalarMultBase(&R, &messageDigestReduced)
-
-        var encodedR [32]byte
-        R.ToBytes(&encodedR)
-
-        h.Reset()
-        h.Write(encodedR[:])
-        h.Write(privateKey[32:])
-        h.Write(message)
-        h.Sum(hramDigest[:0])
-        var hramDigestReduced [32]byte
-        edwards25519.ScReduce(&hramDigestReduced, &hramDigest)
-
-        var s [32]byte
-        edwards25519.ScMulAdd(&s, &hramDigestReduced, &expandedSecretKey, &messageDigestReduced)
-
-        signature := make([]byte, SignatureSize)
-        copy(signature[:], encodedR[:])
-        copy(signature[32:], s[:])
-
-        return signature
-}
-
-// Verify reports whether sig is a valid signature of message by publicKey. It
-// will panic if len(publicKey) is not PublicKeySize.
-func Verify(publicKey PublicKey, message, sig []byte) bool {
-        if l := len(publicKey); l != PublicKeySize {
-                panic("ed25519: bad public key length: " + strconv.Itoa(l))
-        }
-
-        if len(sig) != SignatureSize || sig[63]&224 != 0 {
-                return false
-        }
-
-        var A edwards25519.ExtendedGroupElement
-        var publicKeyBytes [32]byte
-        copy(publicKeyBytes[:], publicKey)
-        if !A.FromBytes(&publicKeyBytes) {
-                return false
-        }
-        edwards25519.FeNeg(&A.X, &A.X)
-        edwards25519.FeNeg(&A.T, &A.T)
-
-        h := sha512.New()
-        h.Write(sig[:32])
-        h.Write(publicKey[:])
-        h.Write(message)
-        var digest [64]byte
-        h.Sum(digest[:0])
-
-        var hReduced [32]byte
-        edwards25519.ScReduce(&hReduced, &digest)
-
-        var R edwards25519.ProjectiveGroupElement
-        var b [32]byte
-        copy(b[:], sig[32:])
-        edwards25519.GeDoubleScalarMultVartime(&R, &hReduced, &A, &b)
-
-        var checkR [32]byte
-        R.ToBytes(&checkR)
-        return subtle.ConstantTimeCompare(sig[:32], checkR[:]) == 1
-}
diff --git a/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/const.go b/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/const.go
deleted file mode 100644
index e39f086..0000000
--- a/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/const.go
+++ /dev/null
@@ -1,1422 +0,0 @@
-// Copyright 2016 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 edwards25519
-
-// These values are from the public domain, “ref10” implementation of ed25519
-// from SUPERCOP.
-
-// d is a constant in the Edwards curve equation.
-var d = FieldElement{
-        -10913610, 13857413, -15372611, 6949391, 114729, -8787816, -6275908, -3247719, -18696448, -12055116,
-}
-
-// d2 is 2*d.
-var d2 = FieldElement{
-        -21827239, -5839606, -30745221, 13898782, 229458, 15978800, -12551817, -6495438, 29715968, 9444199,
-}
-
-// SqrtM1 is the square-root of -1 in the field.
-var SqrtM1 = FieldElement{
-        -32595792, -7943725, 9377950, 3500415, 12389472, -272473, -25146209, -2005654, 326686, 11406482,
-}
-
-// A is a constant in the Montgomery-form of curve25519.
-var A = FieldElement{
-        486662, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-}
-
-// bi contains precomputed multiples of the base-point. See the Ed25519 paper
-// for a discussion about how these values are used.
-var bi = [8]PreComputedGroupElement{
-        {
-                FieldElement{25967493, -14356035, 29566456, 3660896, -12694345, 4014787, 27544626, -11754271, -6079156, 2047605},
-                FieldElement{-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692, 5043384, 19500929, -15469378},
-                FieldElement{-8738181, 4489570, 9688441, -14785194, 10184609, -12363380, 29287919, 11864899, -24514362, -4438546},
-        },
-        {
-                FieldElement{15636291, -9688557, 24204773, -7912398, 616977, -16685262, 27787600, -14772189, 28944400, -1550024},
-                FieldElement{16568933, 4717097, -11556148, -1102322, 15682896, -11807043, 16354577, -11775962, 7689662, 11199574},
-                FieldElement{30464156, -5976125, -11779434, -15670865, 23220365, 15915852, 7512774, 10017326, -17749093, -9920357},
-        },
-        {
-                FieldElement{10861363, 11473154, 27284546, 1981175, -30064349, 12577861, 32867885, 14515107, -15438304, 10819380},
-                FieldElement{4708026, 6336745, 20377586, 9066809, -11272109, 6594696, -25653668, 12483688, -12668491, 5581306},
-                FieldElement{19563160, 16186464, -29386857, 4097519, 10237984, -4348115, 28542350, 13850243, -23678021, -15815942},
-        },
-        {
-                FieldElement{5153746, 9909285, 1723747, -2777874, 30523605, 5516873, 19480852, 5230134, -23952439, -15175766},
-                FieldElement{-30269007, -3463509, 7665486, 10083793, 28475525, 1649722, 20654025, 16520125, 30598449, 7715701},
-                FieldElement{28881845, 14381568, 9657904, 3680757, -20181635, 7843316, -31400660, 1370708, 29794553, -1409300},
-        },
-        {
-                FieldElement{-22518993, -6692182, 14201702, -8745502, -23510406, 8844726, 18474211, -1361450, -13062696, 13821877},
-                FieldElement{-6455177, -7839871, 3374702, -4740862, -27098617, -10571707, 31655028, -7212327, 18853322, -14220951},
-                FieldElement{4566830, -12963868, -28974889, -12240689, -7602672, -2830569, -8514358, -10431137, 2207753, -3209784},
-        },
-        {
-                FieldElement{-25154831, -4185821, 29681144, 7868801, -6854661, -9423865, -12437364, -663000, -31111463, -16132436},
-                FieldElement{25576264, -2703214, 7349804, -11814844, 16472782, 9300885, 3844789, 15725684, 171356, 6466918},
-                FieldElement{23103977, 13316479, 9739013, -16149481, 817875, -15038942, 8965339, -14088058, -30714912, 16193877},
-        },
-        {
-                FieldElement{-33521811, 3180713, -2394130, 14003687, -16903474, -16270840, 17238398, 4729455, -18074513, 9256800},
-                FieldElement{-25182317, -4174131, 32336398, 5036987, -21236817, 11360617, 22616405, 9761698, -19827198, 630305},
-                FieldElement{-13720693, 2639453, -24237460, -7406481, 9494427, -5774029, -6554551, -15960994, -2449256, -14291300},
-        },
-        {
-                FieldElement{-3151181, -5046075, 9282714, 6866145, -31907062, -863023, -18940575, 15033784, 25105118, -7894876},
-                FieldElement{-24326370, 15950226, -31801215, -14592823, -11662737, -5090925, 1573892, -2625887, 2198790, -15804619},
-                FieldElement{-3099351, 10324967, -2241613, 7453183, -5446979, -2735503, -13812022, -16236442, -32461234, -12290683},
-        },
-}
-
-// base contains precomputed multiples of the base-point. See the Ed25519 paper
-// for a discussion about how these values are used.
-var base = [32][8]PreComputedGroupElement{
-        {
-                {
-                        FieldElement{25967493, -14356035, 29566456, 3660896, -12694345, 4014787, 27544626, -11754271, -6079156, 2047605},
-                        FieldElement{-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692, 5043384, 19500929, -15469378},
-                        FieldElement{-8738181, 4489570, 9688441, -14785194, 10184609, -12363380, 29287919, 11864899, -24514362, -4438546},
-                },
-                {
-                        FieldElement{-12815894, -12976347, -21581243, 11784320, -25355658, -2750717, -11717903, -3814571, -358445, -10211303},
-                        FieldElement{-21703237, 6903825, 27185491, 6451973, -29577724, -9554005, -15616551, 11189268, -26829678, -5319081},
-                        FieldElement{26966642, 11152617, 32442495, 15396054, 14353839, -12752335, -3128826, -9541118, -15472047, -4166697},
-                },
-                {
-                        FieldElement{15636291, -9688557, 24204773, -7912398, 616977, -16685262, 27787600, -14772189, 28944400, -1550024},
-                        FieldElement{16568933, 4717097, -11556148, -1102322, 15682896, -11807043, 16354577, -11775962, 7689662, 11199574},
-                        FieldElement{30464156, -5976125, -11779434, -15670865, 23220365, 15915852, 7512774, 10017326, -17749093, -9920357},
-                },
-                {
-                        FieldElement{-17036878, 13921892, 10945806, -6033431, 27105052, -16084379, -28926210, 15006023, 3284568, -6276540},
-                        FieldElement{23599295, -8306047, -11193664, -7687416, 13236774, 10506355, 7464579, 9656445, 13059162, 10374397},
-                        FieldElement{7798556, 16710257, 3033922, 2874086, 28997861, 2835604, 32406664, -3839045, -641708, -101325},
-                },
-                {
-                        FieldElement{10861363, 11473154, 27284546, 1981175, -30064349, 12577861, 32867885, 14515107, -15438304, 10819380},
-                        FieldElement{4708026, 6336745, 20377586, 9066809, -11272109, 6594696, -25653668, 12483688, -12668491, 5581306},
-                        FieldElement{19563160, 16186464, -29386857, 4097519, 10237984, -4348115, 28542350, 13850243, -23678021, -15815942},
-                },
-                {
-                        FieldElement{-15371964, -12862754, 32573250, 4720197, -26436522, 5875511, -19188627, -15224819, -9818940, -12085777},
-                        FieldElement{-8549212, 109983, 15149363, 2178705, 22900618, 4543417, 3044240, -15689887, 1762328, 14866737},
-                        FieldElement{-18199695, -15951423, -10473290, 1707278, -17185920, 3916101, -28236412, 3959421, 27914454, 4383652},
-                },
-                {
-                        FieldElement{5153746, 9909285, 1723747, -2777874, 30523605, 5516873, 19480852, 5230134, -23952439, -15175766},
-                        FieldElement{-30269007, -3463509, 7665486, 10083793, 28475525, 1649722, 20654025, 16520125, 30598449, 7715701},
-                        FieldElement{28881845, 14381568, 9657904, 3680757, -20181635, 7843316, -31400660, 1370708, 29794553, -1409300},
-                },
-                {
-                        FieldElement{14499471, -2729599, -33191113, -4254652, 28494862, 14271267, 30290735, 10876454, -33154098, 2381726},
-                        FieldElement{-7195431, -2655363, -14730155, 462251, -27724326, 3941372, -6236617, 3696005, -32300832, 15351955},
-                        FieldElement{27431194, 8222322, 16448760, -3907995, -18707002, 11938355, -32961401, -2970515, 29551813, 10109425},
-                },
-        },
-        {
-                {
-                        FieldElement{-13657040, -13155431, -31283750, 11777098, 21447386, 6519384, -2378284, -1627556, 10092783, -4764171},
-                        FieldElement{27939166, 14210322, 4677035, 16277044, -22964462, -12398139, -32508754, 12005538, -17810127, 12803510},
-                        FieldElement{17228999, -15661624, -1233527, 300140, -1224870, -11714777, 30364213, -9038194, 18016357, 4397660},
-                },
-                {
-                        FieldElement{-10958843, -7690207, 4776341, -14954238, 27850028, -15602212, -26619106, 14544525, -17477504, 982639},
-                        FieldElement{29253598, 15796703, -2863982, -9908884, 10057023, 3163536, 7332899, -4120128, -21047696, 9934963},
-                        FieldElement{5793303, 16271923, -24131614, -10116404, 29188560, 1206517, -14747930, 4559895, -30123922, -10897950},
-                },
-                {
-                        FieldElement{-27643952, -11493006, 16282657, -11036493, 28414021, -15012264, 24191034, 4541697, -13338309, 5500568},
-                        FieldElement{12650548, -1497113, 9052871, 11355358, -17680037, -8400164, -17430592, 12264343, 10874051, 13524335},
-                        FieldElement{25556948, -3045990, 714651, 2510400, 23394682, -10415330, 33119038, 5080568, -22528059, 5376628},
-                },
-                {
-                        FieldElement{-26088264, -4011052, -17013699, -3537628, -6726793, 1920897, -22321305, -9447443, 4535768, 1569007},
-                        FieldElement{-2255422, 14606630, -21692440, -8039818, 28430649, 8775819, -30494562, 3044290, 31848280, 12543772},
-                        FieldElement{-22028579, 2943893, -31857513, 6777306, 13784462, -4292203, -27377195, -2062731, 7718482, 14474653},
-                },
-                {
-                        FieldElement{2385315, 2454213, -22631320, 46603, -4437935, -15680415, 656965, -7236665, 24316168, -5253567},
-                        FieldElement{13741529, 10911568, -33233417, -8603737, -20177830, -1033297, 33040651, -13424532, -20729456, 8321686},
-                        FieldElement{21060490, -2212744, 15712757, -4336099, 1639040, 10656336, 23845965, -11874838, -9984458, 608372},
-                },
-                {
-                        FieldElement{-13672732, -15087586, -10889693, -7557059, -6036909, 11305547, 1123968, -6780577, 27229399, 23887},
-                        FieldElement{-23244140, -294205, -11744728, 14712571, -29465699, -2029617, 12797024, -6440308, -1633405, 16678954},
-                        FieldElement{-29500620, 4770662, -16054387, 14001338, 7830047, 9564805, -1508144, -4795045, -17169265, 4904953},
-                },
-                {
-                        FieldElement{24059557, 14617003, 19037157, -15039908, 19766093, -14906429, 5169211, 16191880, 2128236, -4326833},
-                        FieldElement{-16981152, 4124966, -8540610, -10653797, 30336522, -14105247, -29806336, 916033, -6882542, -2986532},
-                        FieldElement{-22630907, 12419372, -7134229, -7473371, -16478904, 16739175, 285431, 2763829, 15736322, 4143876},
-                },
-                {
-                        FieldElement{2379352, 11839345, -4110402, -5988665, 11274298, 794957, 212801, -14594663, 23527084, -16458268},
-                        FieldElement{33431127, -11130478, -17838966, -15626900, 8909499, 8376530, -32625340, 4087881, -15188911, -14416214},
-                        FieldElement{1767683, 7197987, -13205226, -2022635, -13091350, 448826, 5799055, 4357868, -4774191, -16323038},
-                },
-        },
-        {
-                {
-                        FieldElement{6721966, 13833823, -23523388, -1551314, 26354293, -11863321, 23365147, -3949732, 7390890, 2759800},
-                        FieldElement{4409041, 2052381, 23373853, 10530217, 7676779, -12885954, 21302353, -4264057, 1244380, -12919645},
-                        FieldElement{-4421239, 7169619, 4982368, -2957590, 30256825, -2777540, 14086413, 9208236, 15886429, 16489664},
-                },
-                {
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-                        FieldElement{15121312, -15796162, 6377020, -6031361, -10798111, -12957845, 18952177, 15496498, -29380133, 11754228},
-                        FieldElement{-2637277, -13483075, 8488727, -14303896, 12728761, -1622493, 7141596, 11724556, 22761615, -10134141},
-                },
-                {
-                        FieldElement{16918416, 11729663, -18083579, 3022987, -31015732, -13339659, -28741185, -12227393, 32851222, 11717399},
-                        FieldElement{11166634, 7338049, -6722523, 4531520, -29468672, -7302055, 31474879, 3483633, -1193175, -4030831},
-                        FieldElement{-185635, 9921305, 31456609, -13536438, -12013818, 13348923, 33142652, 6546660, -19985279, -3948376},
-                },
-                {
-                        FieldElement{-32460596, 11266712, -11197107, -7899103, 31703694, 3855903, -8537131, -12833048, -30772034, -15486313},
-                        FieldElement{-18006477, 12709068, 3991746, -6479188, -21491523, -10550425, -31135347, -16049879, 10928917, 3011958},
-                        FieldElement{-6957757, -15594337, 31696059, 334240, 29576716, 14796075, -30831056, -12805180, 18008031, 10258577},
-                },
-                {
-                        FieldElement{-22448644, 15655569, 7018479, -4410003, -30314266, -1201591, -1853465, 1367120, 25127874, 6671743},
-                        FieldElement{29701166, -14373934, -10878120, 9279288, -17568, 13127210, 21382910, 11042292, 25838796, 4642684},
-                        FieldElement{-20430234, 14955537, -24126347, 8124619, -5369288, -5990470, 30468147, -13900640, 18423289, 4177476},
-                },
-        },
-}
diff --git a/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go b/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go
deleted file mode 100644
index 5f8b994..0000000
--- a/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go
+++ /dev/null
@@ -1,1771 +0,0 @@
-// Copyright 2016 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 edwards25519
-
-// This code is a port of the public domain, “ref10” implementation of ed25519
-// from SUPERCOP.
-
-// FieldElement represents an element of the field GF(2^255 - 19).  An element
-// t, entries t[0]...t[9], represents the integer t[0]+2^26 t[1]+2^51 t[2]+2^77
-// t[3]+2^102 t[4]+...+2^230 t[9].  Bounds on each t[i] vary depending on
-// context.
-type FieldElement [10]int32
-
-var zero FieldElement
-
-func FeZero(fe *FieldElement) {
-        copy(fe[:], zero[:])
-}
-
-func FeOne(fe *FieldElement) {
-        FeZero(fe)
-        fe[0] = 1
-}
-
-func FeAdd(dst, a, b *FieldElement) {
-        dst[0] = a[0] + b[0]
-        dst[1] = a[1] + b[1]
-        dst[2] = a[2] + b[2]
-        dst[3] = a[3] + b[3]
-        dst[4] = a[4] + b[4]
-        dst[5] = a[5] + b[5]
-        dst[6] = a[6] + b[6]
-        dst[7] = a[7] + b[7]
-        dst[8] = a[8] + b[8]
-        dst[9] = a[9] + b[9]
-}
-
-func FeSub(dst, a, b *FieldElement) {
-        dst[0] = a[0] - b[0]
-        dst[1] = a[1] - b[1]
-        dst[2] = a[2] - b[2]
-        dst[3] = a[3] - b[3]
-        dst[4] = a[4] - b[4]
-        dst[5] = a[5] - b[5]
-        dst[6] = a[6] - b[6]
-        dst[7] = a[7] - b[7]
-        dst[8] = a[8] - b[8]
-        dst[9] = a[9] - b[9]
-}
-
-func FeCopy(dst, src *FieldElement) {
-        copy(dst[:], src[:])
-}
-
-// Replace (f,g) with (g,g) if b == 1;
-// replace (f,g) with (f,g) if b == 0.
-//
-// Preconditions: b in {0,1}.
-func FeCMove(f, g *FieldElement, b int32) {
-        b = -b
-        f[0] ^= b & (f[0] ^ g[0])
-        f[1] ^= b & (f[1] ^ g[1])
-        f[2] ^= b & (f[2] ^ g[2])
-        f[3] ^= b & (f[3] ^ g[3])
-        f[4] ^= b & (f[4] ^ g[4])
-        f[5] ^= b & (f[5] ^ g[5])
-        f[6] ^= b & (f[6] ^ g[6])
-        f[7] ^= b & (f[7] ^ g[7])
-        f[8] ^= b & (f[8] ^ g[8])
-        f[9] ^= b & (f[9] ^ g[9])
-}
-
-func load3(in []byte) int64 {
-        var r int64
-        r = int64(in[0])
-        r |= int64(in[1]) << 8
-        r |= int64(in[2]) << 16
-        return r
-}
-
-func load4(in []byte) int64 {
-        var r int64
-        r = int64(in[0])
-        r |= int64(in[1]) << 8
-        r |= int64(in[2]) << 16
-        r |= int64(in[3]) << 24
-        return r
-}
-
-func FeFromBytes(dst *FieldElement, src *[32]byte) {
-        h0 := load4(src[:])
-        h1 := load3(src[4:]) << 6
-        h2 := load3(src[7:]) << 5
-        h3 := load3(src[10:]) << 3
-        h4 := load3(src[13:]) << 2
-        h5 := load4(src[16:])
-        h6 := load3(src[20:]) << 7
-        h7 := load3(src[23:]) << 5
-        h8 := load3(src[26:]) << 4
-        h9 := (load3(src[29:]) & 8388607) << 2
-
-        FeCombine(dst, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9)
-}
-
-// FeToBytes marshals h to s.
-// Preconditions:
-//   |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
-//
-// Write p=2^255-19; q=floor(h/p).
-// Basic claim: q = floor(2^(-255)(h + 19 2^(-25)h9 + 2^(-1))).
-//
-// Proof:
-//   Have |h|<=p so |q|<=1 so |19^2 2^(-255) q|<1/4.
-//   Also have |h-2^230 h9|<2^230 so |19 2^(-255)(h-2^230 h9)|<1/4.
-//
-//   Write y=2^(-1)-19^2 2^(-255)q-19 2^(-255)(h-2^230 h9).
-//   Then 0<y<1.
-//
-//   Write r=h-pq.
-//   Have 0<=r<=p-1=2^255-20.
-//   Thus 0<=r+19(2^-255)r<r+19(2^-255)2^255<=2^255-1.
-//
-//   Write x=r+19(2^-255)r+y.
-//   Then 0<x<2^255 so floor(2^(-255)x) = 0 so floor(q+2^(-255)x) = q.
-//
-//   Have q+2^(-255)x = 2^(-255)(h + 19 2^(-25) h9 + 2^(-1))
-//   so floor(2^(-255)(h + 19 2^(-25) h9 + 2^(-1))) = q.
-func FeToBytes(s *[32]byte, h *FieldElement) {
-        var carry [10]int32
-
-        q := (19*h[9] + (1 << 24)) >> 25
-        q = (h[0] + q) >> 26
-        q = (h[1] + q) >> 25
-        q = (h[2] + q) >> 26
-        q = (h[3] + q) >> 25
-        q = (h[4] + q) >> 26
-        q = (h[5] + q) >> 25
-        q = (h[6] + q) >> 26
-        q = (h[7] + q) >> 25
-        q = (h[8] + q) >> 26
-        q = (h[9] + q) >> 25
-
-        // Goal: Output h-(2^255-19)q, which is between 0 and 2^255-20.
-        h[0] += 19 * q
-        // Goal: Output h-2^255 q, which is between 0 and 2^255-20.
-
-        carry[0] = h[0] >> 26
-        h[1] += carry[0]
-        h[0] -= carry[0] << 26
-        carry[1] = h[1] >> 25
-        h[2] += carry[1]
-        h[1] -= carry[1] << 25
-        carry[2] = h[2] >> 26
-        h[3] += carry[2]
-        h[2] -= carry[2] << 26
-        carry[3] = h[3] >> 25
-        h[4] += carry[3]
-        h[3] -= carry[3] << 25
-        carry[4] = h[4] >> 26
-        h[5] += carry[4]
-        h[4] -= carry[4] << 26
-        carry[5] = h[5] >> 25
-        h[6] += carry[5]
-        h[5] -= carry[5] << 25
-        carry[6] = h[6] >> 26
-        h[7] += carry[6]
-        h[6] -= carry[6] << 26
-        carry[7] = h[7] >> 25
-        h[8] += carry[7]
-        h[7] -= carry[7] << 25
-        carry[8] = h[8] >> 26
-        h[9] += carry[8]
-        h[8] -= carry[8] << 26
-        carry[9] = h[9] >> 25
-        h[9] -= carry[9] << 25
-        // h10 = carry9
-
-        // Goal: Output h[0]+...+2^255 h10-2^255 q, which is between 0 and 2^255-20.
-        // Have h[0]+...+2^230 h[9] between 0 and 2^255-1;
-        // evidently 2^255 h10-2^255 q = 0.
-        // Goal: Output h[0]+...+2^230 h[9].
-
-        s[0] = byte(h[0] >> 0)
-        s[1] = byte(h[0] >> 8)
-        s[2] = byte(h[0] >> 16)
-        s[3] = byte((h[0] >> 24) | (h[1] << 2))
-        s[4] = byte(h[1] >> 6)
-        s[5] = byte(h[1] >> 14)
-        s[6] = byte((h[1] >> 22) | (h[2] << 3))
-        s[7] = byte(h[2] >> 5)
-        s[8] = byte(h[2] >> 13)
-        s[9] = byte((h[2] >> 21) | (h[3] << 5))
-        s[10] = byte(h[3] >> 3)
-        s[11] = byte(h[3] >> 11)
-        s[12] = byte((h[3] >> 19) | (h[4] << 6))
-        s[13] = byte(h[4] >> 2)
-        s[14] = byte(h[4] >> 10)
-        s[15] = byte(h[4] >> 18)
-        s[16] = byte(h[5] >> 0)
-        s[17] = byte(h[5] >> 8)
-        s[18] = byte(h[5] >> 16)
-        s[19] = byte((h[5] >> 24) | (h[6] << 1))
-        s[20] = byte(h[6] >> 7)
-        s[21] = byte(h[6] >> 15)
-        s[22] = byte((h[6] >> 23) | (h[7] << 3))
-        s[23] = byte(h[7] >> 5)
-        s[24] = byte(h[7] >> 13)
-        s[25] = byte((h[7] >> 21) | (h[8] << 4))
-        s[26] = byte(h[8] >> 4)
-        s[27] = byte(h[8] >> 12)
-        s[28] = byte((h[8] >> 20) | (h[9] << 6))
-        s[29] = byte(h[9] >> 2)
-        s[30] = byte(h[9] >> 10)
-        s[31] = byte(h[9] >> 18)
-}
-
-func FeIsNegative(f *FieldElement) byte {
-        var s [32]byte
-        FeToBytes(&s, f)
-        return s[0] & 1
-}
-
-func FeIsNonZero(f *FieldElement) int32 {
-        var s [32]byte
-        FeToBytes(&s, f)
-        var x uint8
-        for _, b := range s {
-                x |= b
-        }
-        x |= x >> 4
-        x |= x >> 2
-        x |= x >> 1
-        return int32(x & 1)
-}
-
-// FeNeg sets h = -f
-//
-// Preconditions:
-//    |f| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
-//
-// Postconditions:
-//    |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
-func FeNeg(h, f *FieldElement) {
-        h[0] = -f[0]
-        h[1] = -f[1]
-        h[2] = -f[2]
-        h[3] = -f[3]
-        h[4] = -f[4]
-        h[5] = -f[5]
-        h[6] = -f[6]
-        h[7] = -f[7]
-        h[8] = -f[8]
-        h[9] = -f[9]
-}
-
-func FeCombine(h *FieldElement, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 int64) {
-        var c0, c1, c2, c3, c4, c5, c6, c7, c8, c9 int64
-
-        /*
-          |h0| <= (1.1*1.1*2^52*(1+19+19+19+19)+1.1*1.1*2^50*(38+38+38+38+38))
-            i.e. |h0| <= 1.2*2^59; narrower ranges for h2, h4, h6, h8
-          |h1| <= (1.1*1.1*2^51*(1+1+19+19+19+19+19+19+19+19))
-            i.e. |h1| <= 1.5*2^58; narrower ranges for h3, h5, h7, h9
-        */
-
-        c0 = (h0 + (1 << 25)) >> 26
-        h1 += c0
-        h0 -= c0 << 26
-        c4 = (h4 + (1 << 25)) >> 26
-        h5 += c4
-        h4 -= c4 << 26
-        /* |h0| <= 2^25 */
-        /* |h4| <= 2^25 */
-        /* |h1| <= 1.51*2^58 */
-        /* |h5| <= 1.51*2^58 */
-
-        c1 = (h1 + (1 << 24)) >> 25
-        h2 += c1
-        h1 -= c1 << 25
-        c5 = (h5 + (1 << 24)) >> 25
-        h6 += c5
-        h5 -= c5 << 25
-        /* |h1| <= 2^24; from now on fits into int32 */
-        /* |h5| <= 2^24; from now on fits into int32 */
-        /* |h2| <= 1.21*2^59 */
-        /* |h6| <= 1.21*2^59 */
-
-        c2 = (h2 + (1 << 25)) >> 26
-        h3 += c2
-        h2 -= c2 << 26
-        c6 = (h6 + (1 << 25)) >> 26
-        h7 += c6
-        h6 -= c6 << 26
-        /* |h2| <= 2^25; from now on fits into int32 unchanged */
-        /* |h6| <= 2^25; from now on fits into int32 unchanged */
-        /* |h3| <= 1.51*2^58 */
-        /* |h7| <= 1.51*2^58 */
-
-        c3 = (h3 + (1 << 24)) >> 25
-        h4 += c3
-        h3 -= c3 << 25
-        c7 = (h7 + (1 << 24)) >> 25
-        h8 += c7
-        h7 -= c7 << 25
-        /* |h3| <= 2^24; from now on fits into int32 unchanged */
-        /* |h7| <= 2^24; from now on fits into int32 unchanged */
-        /* |h4| <= 1.52*2^33 */
-        /* |h8| <= 1.52*2^33 */
-
-        c4 = (h4 + (1 << 25)) >> 26
-        h5 += c4
-        h4 -= c4 << 26
-        c8 = (h8 + (1 << 25)) >> 26
-        h9 += c8
-        h8 -= c8 << 26
-        /* |h4| <= 2^25; from now on fits into int32 unchanged */
-        /* |h8| <= 2^25; from now on fits into int32 unchanged */
-        /* |h5| <= 1.01*2^24 */
-        /* |h9| <= 1.51*2^58 */
-
-        c9 = (h9 + (1 << 24)) >> 25
-        h0 += c9 * 19
-        h9 -= c9 << 25
-        /* |h9| <= 2^24; from now on fits into int32 unchanged */
-        /* |h0| <= 1.8*2^37 */
-
-        c0 = (h0 + (1 << 25)) >> 26
-        h1 += c0
-        h0 -= c0 << 26
-        /* |h0| <= 2^25; from now on fits into int32 unchanged */
-        /* |h1| <= 1.01*2^24 */
-
-        h[0] = int32(h0)
-        h[1] = int32(h1)
-        h[2] = int32(h2)
-        h[3] = int32(h3)
-        h[4] = int32(h4)
-        h[5] = int32(h5)
-        h[6] = int32(h6)
-        h[7] = int32(h7)
-        h[8] = int32(h8)
-        h[9] = int32(h9)
-}
-
-// FeMul calculates h = f * g
-// Can overlap h with f or g.
-//
-// Preconditions:
-//    |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
-//    |g| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
-//
-// Postconditions:
-//    |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
-//
-// Notes on implementation strategy:
-//
-// Using schoolbook multiplication.
-// Karatsuba would save a little in some cost models.
-//
-// Most multiplications by 2 and 19 are 32-bit precomputations;
-// cheaper than 64-bit postcomputations.
-//
-// There is one remaining multiplication by 19 in the carry chain;
-// one *19 precomputation can be merged into this,
-// but the resulting data flow is considerably less clean.
-//
-// There are 12 carries below.
-// 10 of them are 2-way parallelizable and vectorizable.
-// Can get away with 11 carries, but then data flow is much deeper.
-//
-// With tighter constraints on inputs, can squeeze carries into int32.
-func FeMul(h, f, g *FieldElement) {
-        f0 := int64(f[0])
-        f1 := int64(f[1])
-        f2 := int64(f[2])
-        f3 := int64(f[3])
-        f4 := int64(f[4])
-        f5 := int64(f[5])
-        f6 := int64(f[6])
-        f7 := int64(f[7])
-        f8 := int64(f[8])
-        f9 := int64(f[9])
-
-        f1_2 := int64(2 * f[1])
-        f3_2 := int64(2 * f[3])
-        f5_2 := int64(2 * f[5])
-        f7_2 := int64(2 * f[7])
-        f9_2 := int64(2 * f[9])
-
-        g0 := int64(g[0])
-        g1 := int64(g[1])
-        g2 := int64(g[2])
-        g3 := int64(g[3])
-        g4 := int64(g[4])
-        g5 := int64(g[5])
-        g6 := int64(g[6])
-        g7 := int64(g[7])
-        g8 := int64(g[8])
-        g9 := int64(g[9])
-
-        g1_19 := int64(19 * g[1]) /* 1.4*2^29 */
-        g2_19 := int64(19 * g[2]) /* 1.4*2^30; still ok */
-        g3_19 := int64(19 * g[3])
-        g4_19 := int64(19 * g[4])
-        g5_19 := int64(19 * g[5])
-        g6_19 := int64(19 * g[6])
-        g7_19 := int64(19 * g[7])
-        g8_19 := int64(19 * g[8])
-        g9_19 := int64(19 * g[9])
-
-        h0 := f0*g0 + f1_2*g9_19 + f2*g8_19 + f3_2*g7_19 + f4*g6_19 + f5_2*g5_19 + f6*g4_19 + f7_2*g3_19 + f8*g2_19 + f9_2*g1_19
-        h1 := f0*g1 + f1*g0 + f2*g9_19 + f3*g8_19 + f4*g7_19 + f5*g6_19 + f6*g5_19 + f7*g4_19 + f8*g3_19 + f9*g2_19
-        h2 := f0*g2 + f1_2*g1 + f2*g0 + f3_2*g9_19 + f4*g8_19 + f5_2*g7_19 + f6*g6_19 + f7_2*g5_19 + f8*g4_19 + f9_2*g3_19
-        h3 := f0*g3 + f1*g2 + f2*g1 + f3*g0 + f4*g9_19 + f5*g8_19 + f6*g7_19 + f7*g6_19 + f8*g5_19 + f9*g4_19
-        h4 := f0*g4 + f1_2*g3 + f2*g2 + f3_2*g1 + f4*g0 + f5_2*g9_19 + f6*g8_19 + f7_2*g7_19 + f8*g6_19 + f9_2*g5_19
-        h5 := f0*g5 + f1*g4 + f2*g3 + f3*g2 + f4*g1 + f5*g0 + f6*g9_19 + f7*g8_19 + f8*g7_19 + f9*g6_19
-        h6 := f0*g6 + f1_2*g5 + f2*g4 + f3_2*g3 + f4*g2 + f5_2*g1 + f6*g0 + f7_2*g9_19 + f8*g8_19 + f9_2*g7_19
-        h7 := f0*g7 + f1*g6 + f2*g5 + f3*g4 + f4*g3 + f5*g2 + f6*g1 + f7*g0 + f8*g9_19 + f9*g8_19
-        h8 := f0*g8 + f1_2*g7 + f2*g6 + f3_2*g5 + f4*g4 + f5_2*g3 + f6*g2 + f7_2*g1 + f8*g0 + f9_2*g9_19
-        h9 := f0*g9 + f1*g8 + f2*g7 + f3*g6 + f4*g5 + f5*g4 + f6*g3 + f7*g2 + f8*g1 + f9*g0
-
-        FeCombine(h, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9)
-}
-
-func feSquare(f *FieldElement) (h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 int64) {
-        f0 := int64(f[0])
-        f1 := int64(f[1])
-        f2 := int64(f[2])
-        f3 := int64(f[3])
-        f4 := int64(f[4])
-        f5 := int64(f[5])
-        f6 := int64(f[6])
-        f7 := int64(f[7])
-        f8 := int64(f[8])
-        f9 := int64(f[9])
-        f0_2 := int64(2 * f[0])
-        f1_2 := int64(2 * f[1])
-        f2_2 := int64(2 * f[2])
-        f3_2 := int64(2 * f[3])
-        f4_2 := int64(2 * f[4])
-        f5_2 := int64(2 * f[5])
-        f6_2 := int64(2 * f[6])
-        f7_2 := int64(2 * f[7])
-        f5_38 := 38 * f5 // 1.31*2^30
-        f6_19 := 19 * f6 // 1.31*2^30
-        f7_38 := 38 * f7 // 1.31*2^30
-        f8_19 := 19 * f8 // 1.31*2^30
-        f9_38 := 38 * f9 // 1.31*2^30
-
-        h0 = f0*f0 + f1_2*f9_38 + f2_2*f8_19 + f3_2*f7_38 + f4_2*f6_19 + f5*f5_38
-        h1 = f0_2*f1 + f2*f9_38 + f3_2*f8_19 + f4*f7_38 + f5_2*f6_19
-        h2 = f0_2*f2 + f1_2*f1 + f3_2*f9_38 + f4_2*f8_19 + f5_2*f7_38 + f6*f6_19
-        h3 = f0_2*f3 + f1_2*f2 + f4*f9_38 + f5_2*f8_19 + f6*f7_38
-        h4 = f0_2*f4 + f1_2*f3_2 + f2*f2 + f5_2*f9_38 + f6_2*f8_19 + f7*f7_38
-        h5 = f0_2*f5 + f1_2*f4 + f2_2*f3 + f6*f9_38 + f7_2*f8_19
-        h6 = f0_2*f6 + f1_2*f5_2 + f2_2*f4 + f3_2*f3 + f7_2*f9_38 + f8*f8_19
-        h7 = f0_2*f7 + f1_2*f6 + f2_2*f5 + f3_2*f4 + f8*f9_38
-        h8 = f0_2*f8 + f1_2*f7_2 + f2_2*f6 + f3_2*f5_2 + f4*f4 + f9*f9_38
-        h9 = f0_2*f9 + f1_2*f8 + f2_2*f7 + f3_2*f6 + f4_2*f5
-
-        return
-}
-
-// FeSquare calculates h = f*f. Can overlap h with f.
-//
-// Preconditions:
-//    |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
-//
-// Postconditions:
-//    |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
-func FeSquare(h, f *FieldElement) {
-        h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 := feSquare(f)
-        FeCombine(h, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9)
-}
-
-// FeSquare2 sets h = 2 * f * f
-//
-// Can overlap h with f.
-//
-// Preconditions:
-//    |f| bounded by 1.65*2^26,1.65*2^25,1.65*2^26,1.65*2^25,etc.
-//
-// Postconditions:
-//    |h| bounded by 1.01*2^25,1.01*2^24,1.01*2^25,1.01*2^24,etc.
-// See fe_mul.c for discussion of implementation strategy.
-func FeSquare2(h, f *FieldElement) {
-        h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 := feSquare(f)
-
-        h0 += h0
-        h1 += h1
-        h2 += h2
-        h3 += h3
-        h4 += h4
-        h5 += h5
-        h6 += h6
-        h7 += h7
-        h8 += h8
-        h9 += h9
-
-        FeCombine(h, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9)
-}
-
-func FeInvert(out, z *FieldElement) {
-        var t0, t1, t2, t3 FieldElement
-        var i int
-
-        FeSquare(&t0, z)        // 2^1
-        FeSquare(&t1, &t0)      // 2^2
-        for i = 1; i < 2; i++ { // 2^3
-                FeSquare(&t1, &t1)
-        }
-        FeMul(&t1, z, &t1)      // 2^3 + 2^0
-        FeMul(&t0, &t0, &t1)    // 2^3 + 2^1 + 2^0
-        FeSquare(&t2, &t0)      // 2^4 + 2^2 + 2^1
-        FeMul(&t1, &t1, &t2)    // 2^4 + 2^3 + 2^2 + 2^1 + 2^0
-        FeSquare(&t2, &t1)      // 5,4,3,2,1
-        for i = 1; i < 5; i++ { // 9,8,7,6,5
-                FeSquare(&t2, &t2)
-        }
-        FeMul(&t1, &t2, &t1)     // 9,8,7,6,5,4,3,2,1,0
-        FeSquare(&t2, &t1)       // 10..1
-        for i = 1; i < 10; i++ { // 19..10
-                FeSquare(&t2, &t2)
-        }
-        FeMul(&t2, &t2, &t1)     // 19..0
-        FeSquare(&t3, &t2)       // 20..1
-        for i = 1; i < 20; i++ { // 39..20
-                FeSquare(&t3, &t3)
-        }
-        FeMul(&t2, &t3, &t2)     // 39..0
-        FeSquare(&t2, &t2)       // 40..1
-        for i = 1; i < 10; i++ { // 49..10
-                FeSquare(&t2, &t2)
-        }
-        FeMul(&t1, &t2, &t1)     // 49..0
-        FeSquare(&t2, &t1)       // 50..1
-        for i = 1; i < 50; i++ { // 99..50
-                FeSquare(&t2, &t2)
-        }
-        FeMul(&t2, &t2, &t1)      // 99..0
-        FeSquare(&t3, &t2)        // 100..1
-        for i = 1; i < 100; i++ { // 199..100
-                FeSquare(&t3, &t3)
-        }
-        FeMul(&t2, &t3, &t2)     // 199..0
-        FeSquare(&t2, &t2)       // 200..1
-        for i = 1; i < 50; i++ { // 249..50
-                FeSquare(&t2, &t2)
-        }
-        FeMul(&t1, &t2, &t1)    // 249..0
-        FeSquare(&t1, &t1)      // 250..1
-        for i = 1; i < 5; i++ { // 254..5
-                FeSquare(&t1, &t1)
-        }
-        FeMul(out, &t1, &t0) // 254..5,3,1,0
-}
-
-func fePow22523(out, z *FieldElement) {
-        var t0, t1, t2 FieldElement
-        var i int
-
-        FeSquare(&t0, z)
-        for i = 1; i < 1; i++ {
-                FeSquare(&t0, &t0)
-        }
-        FeSquare(&t1, &t0)
-        for i = 1; i < 2; i++ {
-                FeSquare(&t1, &t1)
-        }
-        FeMul(&t1, z, &t1)
-        FeMul(&t0, &t0, &t1)
-        FeSquare(&t0, &t0)
-        for i = 1; i < 1; i++ {
-                FeSquare(&t0, &t0)
-        }
-        FeMul(&t0, &t1, &t0)
-        FeSquare(&t1, &t0)
-        for i = 1; i < 5; i++ {
-                FeSquare(&t1, &t1)
-        }
-        FeMul(&t0, &t1, &t0)
-        FeSquare(&t1, &t0)
-        for i = 1; i < 10; i++ {
-                FeSquare(&t1, &t1)
-        }
-        FeMul(&t1, &t1, &t0)
-        FeSquare(&t2, &t1)
-        for i = 1; i < 20; i++ {
-                FeSquare(&t2, &t2)
-        }
-        FeMul(&t1, &t2, &t1)
-        FeSquare(&t1, &t1)
-        for i = 1; i < 10; i++ {
-                FeSquare(&t1, &t1)
-        }
-        FeMul(&t0, &t1, &t0)
-        FeSquare(&t1, &t0)
-        for i = 1; i < 50; i++ {
-                FeSquare(&t1, &t1)
-        }
-        FeMul(&t1, &t1, &t0)
-        FeSquare(&t2, &t1)
-        for i = 1; i < 100; i++ {
-                FeSquare(&t2, &t2)
-        }
-        FeMul(&t1, &t2, &t1)
-        FeSquare(&t1, &t1)
-        for i = 1; i < 50; i++ {
-                FeSquare(&t1, &t1)
-        }
-        FeMul(&t0, &t1, &t0)
-        FeSquare(&t0, &t0)
-        for i = 1; i < 2; i++ {
-                FeSquare(&t0, &t0)
-        }
-        FeMul(out, &t0, z)
-}
-
-// Group elements are members of the elliptic curve -x^2 + y^2 = 1 + d * x^2 *
-// y^2 where d = -121665/121666.
-//
-// Several representations are used:
-//   ProjectiveGroupElement: (X:Y:Z) satisfying x=X/Z, y=Y/Z
-//   ExtendedGroupElement: (X:Y:Z:T) satisfying x=X/Z, y=Y/Z, XY=ZT
-//   CompletedGroupElement: ((X:Z),(Y:T)) satisfying x=X/Z, y=Y/T
-//   PreComputedGroupElement: (y+x,y-x,2dxy)
-
-type ProjectiveGroupElement struct {
-        X, Y, Z FieldElement
-}
-
-type ExtendedGroupElement struct {
-        X, Y, Z, T FieldElement
-}
-
-type CompletedGroupElement struct {
-        X, Y, Z, T FieldElement
-}
-
-type PreComputedGroupElement struct {
-        yPlusX, yMinusX, xy2d FieldElement
-}
-
-type CachedGroupElement struct {
-        yPlusX, yMinusX, Z, T2d FieldElement
-}
-
-func (p *ProjectiveGroupElement) Zero() {
-        FeZero(&p.X)
-        FeOne(&p.Y)
-        FeOne(&p.Z)
-}
-
-func (p *ProjectiveGroupElement) Double(r *CompletedGroupElement) {
-        var t0 FieldElement
-
-        FeSquare(&r.X, &p.X)
-        FeSquare(&r.Z, &p.Y)
-        FeSquare2(&r.T, &p.Z)
-        FeAdd(&r.Y, &p.X, &p.Y)
-        FeSquare(&t0, &r.Y)
-        FeAdd(&r.Y, &r.Z, &r.X)
-        FeSub(&r.Z, &r.Z, &r.X)
-        FeSub(&r.X, &t0, &r.Y)
-        FeSub(&r.T, &r.T, &r.Z)
-}
-
-func (p *ProjectiveGroupElement) ToBytes(s *[32]byte) {
-        var recip, x, y FieldElement
-
-        FeInvert(&recip, &p.Z)
-        FeMul(&x, &p.X, &recip)
-        FeMul(&y, &p.Y, &recip)
-        FeToBytes(s, &y)
-        s[31] ^= FeIsNegative(&x) << 7
-}
-
-func (p *ExtendedGroupElement) Zero() {
-        FeZero(&p.X)
-        FeOne(&p.Y)
-        FeOne(&p.Z)
-        FeZero(&p.T)
-}
-
-func (p *ExtendedGroupElement) Double(r *CompletedGroupElement) {
-        var q ProjectiveGroupElement
-        p.ToProjective(&q)
-        q.Double(r)
-}
-
-func (p *ExtendedGroupElement) ToCached(r *CachedGroupElement) {
-        FeAdd(&r.yPlusX, &p.Y, &p.X)
-        FeSub(&r.yMinusX, &p.Y, &p.X)
-        FeCopy(&r.Z, &p.Z)
-        FeMul(&r.T2d, &p.T, &d2)
-}
-
-func (p *ExtendedGroupElement) ToProjective(r *ProjectiveGroupElement) {
-        FeCopy(&r.X, &p.X)
-        FeCopy(&r.Y, &p.Y)
-        FeCopy(&r.Z, &p.Z)
-}
-
-func (p *ExtendedGroupElement) ToBytes(s *[32]byte) {
-        var recip, x, y FieldElement
-
-        FeInvert(&recip, &p.Z)
-        FeMul(&x, &p.X, &recip)
-        FeMul(&y, &p.Y, &recip)
-        FeToBytes(s, &y)
-        s[31] ^= FeIsNegative(&x) << 7
-}
-
-func (p *ExtendedGroupElement) FromBytes(s *[32]byte) bool {
-        var u, v, v3, vxx, check FieldElement
-
-        FeFromBytes(&p.Y, s)
-        FeOne(&p.Z)
-        FeSquare(&u, &p.Y)
-        FeMul(&v, &u, &d)
-        FeSub(&u, &u, &p.Z) // y = y^2-1
-        FeAdd(&v, &v, &p.Z) // v = dy^2+1
-
-        FeSquare(&v3, &v)
-        FeMul(&v3, &v3, &v) // v3 = v^3
-        FeSquare(&p.X, &v3)
-        FeMul(&p.X, &p.X, &v)
-        FeMul(&p.X, &p.X, &u) // x = uv^7
-
-        fePow22523(&p.X, &p.X) // x = (uv^7)^((q-5)/8)
-        FeMul(&p.X, &p.X, &v3)
-        FeMul(&p.X, &p.X, &u) // x = uv^3(uv^7)^((q-5)/8)
-
-        var tmpX, tmp2 [32]byte
-
-        FeSquare(&vxx, &p.X)
-        FeMul(&vxx, &vxx, &v)
-        FeSub(&check, &vxx, &u) // vx^2-u
-        if FeIsNonZero(&check) == 1 {
-                FeAdd(&check, &vxx, &u) // vx^2+u
-                if FeIsNonZero(&check) == 1 {
-                        return false
-                }
-                FeMul(&p.X, &p.X, &SqrtM1)
-
-                FeToBytes(&tmpX, &p.X)
-                for i, v := range tmpX {
-                        tmp2[31-i] = v
-                }
-        }
-
-        if FeIsNegative(&p.X) != (s[31] >> 7) {
-                FeNeg(&p.X, &p.X)
-        }
-
-        FeMul(&p.T, &p.X, &p.Y)
-        return true
-}
-
-func (p *CompletedGroupElement) ToProjective(r *ProjectiveGroupElement) {
-        FeMul(&r.X, &p.X, &p.T)
-        FeMul(&r.Y, &p.Y, &p.Z)
-        FeMul(&r.Z, &p.Z, &p.T)
-}
-
-func (p *CompletedGroupElement) ToExtended(r *ExtendedGroupElement) {
-        FeMul(&r.X, &p.X, &p.T)
-        FeMul(&r.Y, &p.Y, &p.Z)
-        FeMul(&r.Z, &p.Z, &p.T)
-        FeMul(&r.T, &p.X, &p.Y)
-}
-
-func (p *PreComputedGroupElement) Zero() {
-        FeOne(&p.yPlusX)
-        FeOne(&p.yMinusX)
-        FeZero(&p.xy2d)
-}
-
-func geAdd(r *CompletedGroupElement, p *ExtendedGroupElement, q *CachedGroupElement) {
-        var t0 FieldElement
-
-        FeAdd(&r.X, &p.Y, &p.X)
-        FeSub(&r.Y, &p.Y, &p.X)
-        FeMul(&r.Z, &r.X, &q.yPlusX)
-        FeMul(&r.Y, &r.Y, &q.yMinusX)
-        FeMul(&r.T, &q.T2d, &p.T)
-        FeMul(&r.X, &p.Z, &q.Z)
-        FeAdd(&t0, &r.X, &r.X)
-        FeSub(&r.X, &r.Z, &r.Y)
-        FeAdd(&r.Y, &r.Z, &r.Y)
-        FeAdd(&r.Z, &t0, &r.T)
-        FeSub(&r.T, &t0, &r.T)
-}
-
-func geSub(r *CompletedGroupElement, p *ExtendedGroupElement, q *CachedGroupElement) {
-        var t0 FieldElement
-
-        FeAdd(&r.X, &p.Y, &p.X)
-        FeSub(&r.Y, &p.Y, &p.X)
-        FeMul(&r.Z, &r.X, &q.yMinusX)
-        FeMul(&r.Y, &r.Y, &q.yPlusX)
-        FeMul(&r.T, &q.T2d, &p.T)
-        FeMul(&r.X, &p.Z, &q.Z)
-        FeAdd(&t0, &r.X, &r.X)
-        FeSub(&r.X, &r.Z, &r.Y)
-        FeAdd(&r.Y, &r.Z, &r.Y)
-        FeSub(&r.Z, &t0, &r.T)
-        FeAdd(&r.T, &t0, &r.T)
-}
-
-func geMixedAdd(r *CompletedGroupElement, p *ExtendedGroupElement, q *PreComputedGroupElement) {
-        var t0 FieldElement
-
-        FeAdd(&r.X, &p.Y, &p.X)
-        FeSub(&r.Y, &p.Y, &p.X)
-        FeMul(&r.Z, &r.X, &q.yPlusX)
-        FeMul(&r.Y, &r.Y, &q.yMinusX)
-        FeMul(&r.T, &q.xy2d, &p.T)
-        FeAdd(&t0, &p.Z, &p.Z)
-        FeSub(&r.X, &r.Z, &r.Y)
-        FeAdd(&r.Y, &r.Z, &r.Y)
-        FeAdd(&r.Z, &t0, &r.T)
-        FeSub(&r.T, &t0, &r.T)
-}
-
-func geMixedSub(r *CompletedGroupElement, p *ExtendedGroupElement, q *PreComputedGroupElement) {
-        var t0 FieldElement
-
-        FeAdd(&r.X, &p.Y, &p.X)
-        FeSub(&r.Y, &p.Y, &p.X)
-        FeMul(&r.Z, &r.X, &q.yMinusX)
-        FeMul(&r.Y, &r.Y, &q.yPlusX)
-        FeMul(&r.T, &q.xy2d, &p.T)
-        FeAdd(&t0, &p.Z, &p.Z)
-        FeSub(&r.X, &r.Z, &r.Y)
-        FeAdd(&r.Y, &r.Z, &r.Y)
-        FeSub(&r.Z, &t0, &r.T)
-        FeAdd(&r.T, &t0, &r.T)
-}
-
-func slide(r *[256]int8, a *[32]byte) {
-        for i := range r {
-                r[i] = int8(1 & (a[i>>3] >> uint(i&7)))
-        }
-
-        for i := range r {
-                if r[i] != 0 {
-                        for b := 1; b <= 6 && i+b < 256; b++ {
-                                if r[i+b] != 0 {
-                                        if r[i]+(r[i+b]<<uint(b)) <= 15 {
-                                                r[i] += r[i+b] << uint(b)
-                                                r[i+b] = 0
-                                        } else if r[i]-(r[i+b]<<uint(b)) >= -15 {
-                                                r[i] -= r[i+b] << uint(b)
-                                                for k := i + b; k < 256; k++ {
-                                                        if r[k] == 0 {
-                                                                r[k] = 1
-                                                                break
-                                                        }
-                                                        r[k] = 0
-                                                }
-                                        } else {
-                                                break
-                                        }
-                                }
-                        }
-                }
-        }
-}
-
-// GeDoubleScalarMultVartime sets r = a*A + b*B
-// where a = a[0]+256*a[1]+...+256^31 a[31].
-// and b = b[0]+256*b[1]+...+256^31 b[31].
-// B is the Ed25519 base point (x,4/5) with x positive.
-func GeDoubleScalarMultVartime(r *ProjectiveGroupElement, a *[32]byte, A *ExtendedGroupElement, b *[32]byte) {
-        var aSlide, bSlide [256]int8
-        var Ai [8]CachedGroupElement // A,3A,5A,7A,9A,11A,13A,15A
-        var t CompletedGroupElement
-        var u, A2 ExtendedGroupElement
-        var i int
-
-        slide(&aSlide, a)
-        slide(&bSlide, b)
-
-        A.ToCached(&Ai[0])
-        A.Double(&t)
-        t.ToExtended(&A2)
-
-        for i := 0; i < 7; i++ {
-                geAdd(&t, &A2, &Ai[i])
-                t.ToExtended(&u)
-                u.ToCached(&Ai[i+1])
-        }
-
-        r.Zero()
-
-        for i = 255; i >= 0; i-- {
-                if aSlide[i] != 0 || bSlide[i] != 0 {
-                        break
-                }
-        }
-
-        for ; i >= 0; i-- {
-                r.Double(&t)
-
-                if aSlide[i] > 0 {
-                        t.ToExtended(&u)
-                        geAdd(&t, &u, &Ai[aSlide[i]/2])
-                } else if aSlide[i] < 0 {
-                        t.ToExtended(&u)
-                        geSub(&t, &u, &Ai[(-aSlide[i])/2])
-                }
-
-                if bSlide[i] > 0 {
-                        t.ToExtended(&u)
-                        geMixedAdd(&t, &u, &bi[bSlide[i]/2])
-                } else if bSlide[i] < 0 {
-                        t.ToExtended(&u)
-                        geMixedSub(&t, &u, &bi[(-bSlide[i])/2])
-                }
-
-                t.ToProjective(r)
-        }
-}
-
-// equal returns 1 if b == c and 0 otherwise, assuming that b and c are
-// non-negative.
-func equal(b, c int32) int32 {
-        x := uint32(b ^ c)
-        x--
-        return int32(x >> 31)
-}
-
-// negative returns 1 if b < 0 and 0 otherwise.
-func negative(b int32) int32 {
-        return (b >> 31) & 1
-}
-
-func PreComputedGroupElementCMove(t, u *PreComputedGroupElement, b int32) {
-        FeCMove(&t.yPlusX, &u.yPlusX, b)
-        FeCMove(&t.yMinusX, &u.yMinusX, b)
-        FeCMove(&t.xy2d, &u.xy2d, b)
-}
-
-func selectPoint(t *PreComputedGroupElement, pos int32, b int32) {
-        var minusT PreComputedGroupElement
-        bNegative := negative(b)
-        bAbs := b - (((-bNegative) & b) << 1)
-
-        t.Zero()
-        for i := int32(0); i < 8; i++ {
-                PreComputedGroupElementCMove(t, &base[pos][i], equal(bAbs, i+1))
-        }
-        FeCopy(&minusT.yPlusX, &t.yMinusX)
-        FeCopy(&minusT.yMinusX, &t.yPlusX)
-        FeNeg(&minusT.xy2d, &t.xy2d)
-        PreComputedGroupElementCMove(t, &minusT, bNegative)
-}
-
-// GeScalarMultBase computes h = a*B, where
-//   a = a[0]+256*a[1]+...+256^31 a[31]
-//   B is the Ed25519 base point (x,4/5) with x positive.
-//
-// Preconditions:
-//   a[31] <= 127
-func GeScalarMultBase(h *ExtendedGroupElement, a *[32]byte) {
-        var e [64]int8
-
-        for i, v := range a {
-                e[2*i] = int8(v & 15)
-                e[2*i+1] = int8((v >> 4) & 15)
-        }
-
-        // each e[i] is between 0 and 15 and e[63] is between 0 and 7.
-
-        carry := int8(0)
-        for i := 0; i < 63; i++ {
-                e[i] += carry
-                carry = (e[i] + 8) >> 4
-                e[i] -= carry << 4
-        }
-        e[63] += carry
-        // each e[i] is between -8 and 8.
-
-        h.Zero()
-        var t PreComputedGroupElement
-        var r CompletedGroupElement
-        for i := int32(1); i < 64; i += 2 {
-                selectPoint(&t, i/2, int32(e[i]))
-                geMixedAdd(&r, h, &t)
-                r.ToExtended(h)
-        }
-
-        var s ProjectiveGroupElement
-
-        h.Double(&r)
-        r.ToProjective(&s)
-        s.Double(&r)
-        r.ToProjective(&s)
-        s.Double(&r)
-        r.ToProjective(&s)
-        s.Double(&r)
-        r.ToExtended(h)
-
-        for i := int32(0); i < 64; i += 2 {
-                selectPoint(&t, i/2, int32(e[i]))
-                geMixedAdd(&r, h, &t)
-                r.ToExtended(h)
-        }
-}
-
-// The scalars are GF(2^252 + 27742317777372353535851937790883648493).
-
-// Input:
-//   a[0]+256*a[1]+...+256^31*a[31] = a
-//   b[0]+256*b[1]+...+256^31*b[31] = b
-//   c[0]+256*c[1]+...+256^31*c[31] = c
-//
-// Output:
-//   s[0]+256*s[1]+...+256^31*s[31] = (ab+c) mod l
-//   where l = 2^252 + 27742317777372353535851937790883648493.
-func ScMulAdd(s, a, b, c *[32]byte) {
-        a0 := 2097151 & load3(a[:])
-        a1 := 2097151 & (load4(a[2:]) >> 5)
-        a2 := 2097151 & (load3(a[5:]) >> 2)
-        a3 := 2097151 & (load4(a[7:]) >> 7)
-        a4 := 2097151 & (load4(a[10:]) >> 4)
-        a5 := 2097151 & (load3(a[13:]) >> 1)
-        a6 := 2097151 & (load4(a[15:]) >> 6)
-        a7 := 2097151 & (load3(a[18:]) >> 3)
-        a8 := 2097151 & load3(a[21:])
-        a9 := 2097151 & (load4(a[23:]) >> 5)
-        a10 := 2097151 & (load3(a[26:]) >> 2)
-        a11 := (load4(a[28:]) >> 7)
-        b0 := 2097151 & load3(b[:])
-        b1 := 2097151 & (load4(b[2:]) >> 5)
-        b2 := 2097151 & (load3(b[5:]) >> 2)
-        b3 := 2097151 & (load4(b[7:]) >> 7)
-        b4 := 2097151 & (load4(b[10:]) >> 4)
-        b5 := 2097151 & (load3(b[13:]) >> 1)
-        b6 := 2097151 & (load4(b[15:]) >> 6)
-        b7 := 2097151 & (load3(b[18:]) >> 3)
-        b8 := 2097151 & load3(b[21:])
-        b9 := 2097151 & (load4(b[23:]) >> 5)
-        b10 := 2097151 & (load3(b[26:]) >> 2)
-        b11 := (load4(b[28:]) >> 7)
-        c0 := 2097151 & load3(c[:])
-        c1 := 2097151 & (load4(c[2:]) >> 5)
-        c2 := 2097151 & (load3(c[5:]) >> 2)
-        c3 := 2097151 & (load4(c[7:]) >> 7)
-        c4 := 2097151 & (load4(c[10:]) >> 4)
-        c5 := 2097151 & (load3(c[13:]) >> 1)
-        c6 := 2097151 & (load4(c[15:]) >> 6)
-        c7 := 2097151 & (load3(c[18:]) >> 3)
-        c8 := 2097151 & load3(c[21:])
-        c9 := 2097151 & (load4(c[23:]) >> 5)
-        c10 := 2097151 & (load3(c[26:]) >> 2)
-        c11 := (load4(c[28:]) >> 7)
-        var carry [23]int64
-
-        s0 := c0 + a0*b0
-        s1 := c1 + a0*b1 + a1*b0
-        s2 := c2 + a0*b2 + a1*b1 + a2*b0
-        s3 := c3 + a0*b3 + a1*b2 + a2*b1 + a3*b0
-        s4 := c4 + a0*b4 + a1*b3 + a2*b2 + a3*b1 + a4*b0
-        s5 := c5 + a0*b5 + a1*b4 + a2*b3 + a3*b2 + a4*b1 + a5*b0
-        s6 := c6 + a0*b6 + a1*b5 + a2*b4 + a3*b3 + a4*b2 + a5*b1 + a6*b0
-        s7 := c7 + a0*b7 + a1*b6 + a2*b5 + a3*b4 + a4*b3 + a5*b2 + a6*b1 + a7*b0
-        s8 := c8 + a0*b8 + a1*b7 + a2*b6 + a3*b5 + a4*b4 + a5*b3 + a6*b2 + a7*b1 + a8*b0
-        s9 := c9 + a0*b9 + a1*b8 + a2*b7 + a3*b6 + a4*b5 + a5*b4 + a6*b3 + a7*b2 + a8*b1 + a9*b0
-        s10 := c10 + a0*b10 + a1*b9 + a2*b8 + a3*b7 + a4*b6 + a5*b5 + a6*b4 + a7*b3 + a8*b2 + a9*b1 + a10*b0
-        s11 := c11 + a0*b11 + a1*b10 + a2*b9 + a3*b8 + a4*b7 + a5*b6 + a6*b5 + a7*b4 + a8*b3 + a9*b2 + a10*b1 + a11*b0
-        s12 := a1*b11 + a2*b10 + a3*b9 + a4*b8 + a5*b7 + a6*b6 + a7*b5 + a8*b4 + a9*b3 + a10*b2 + a11*b1
-        s13 := a2*b11 + a3*b10 + a4*b9 + a5*b8 + a6*b7 + a7*b6 + a8*b5 + a9*b4 + a10*b3 + a11*b2
-        s14 := a3*b11 + a4*b10 + a5*b9 + a6*b8 + a7*b7 + a8*b6 + a9*b5 + a10*b4 + a11*b3
-        s15 := a4*b11 + a5*b10 + a6*b9 + a7*b8 + a8*b7 + a9*b6 + a10*b5 + a11*b4
-        s16 := a5*b11 + a6*b10 + a7*b9 + a8*b8 + a9*b7 + a10*b6 + a11*b5
-        s17 := a6*b11 + a7*b10 + a8*b9 + a9*b8 + a10*b7 + a11*b6
-        s18 := a7*b11 + a8*b10 + a9*b9 + a10*b8 + a11*b7
-        s19 := a8*b11 + a9*b10 + a10*b9 + a11*b8
-        s20 := a9*b11 + a10*b10 + a11*b9
-        s21 := a10*b11 + a11*b10
-        s22 := a11 * b11
-        s23 := int64(0)
-
-        carry[0] = (s0 + (1 << 20)) >> 21
-        s1 += carry[0]
-        s0 -= carry[0] << 21
-        carry[2] = (s2 + (1 << 20)) >> 21
-        s3 += carry[2]
-        s2 -= carry[2] << 21
-        carry[4] = (s4 + (1 << 20)) >> 21
-        s5 += carry[4]
-        s4 -= carry[4] << 21
-        carry[6] = (s6 + (1 << 20)) >> 21
-        s7 += carry[6]
-        s6 -= carry[6] << 21
-        carry[8] = (s8 + (1 << 20)) >> 21
-        s9 += carry[8]
-        s8 -= carry[8] << 21
-        carry[10] = (s10 + (1 << 20)) >> 21
-        s11 += carry[10]
-        s10 -= carry[10] << 21
-        carry[12] = (s12 + (1 << 20)) >> 21
-        s13 += carry[12]
-        s12 -= carry[12] << 21
-        carry[14] = (s14 + (1 << 20)) >> 21
-        s15 += carry[14]
-        s14 -= carry[14] << 21
-        carry[16] = (s16 + (1 << 20)) >> 21
-        s17 += carry[16]
-        s16 -= carry[16] << 21
-        carry[18] = (s18 + (1 << 20)) >> 21
-        s19 += carry[18]
-        s18 -= carry[18] << 21
-        carry[20] = (s20 + (1 << 20)) >> 21
-        s21 += carry[20]
-        s20 -= carry[20] << 21
-        carry[22] = (s22 + (1 << 20)) >> 21
-        s23 += carry[22]
-        s22 -= carry[22] << 21
-
-        carry[1] = (s1 + (1 << 20)) >> 21
-        s2 += carry[1]
-        s1 -= carry[1] << 21
-        carry[3] = (s3 + (1 << 20)) >> 21
-        s4 += carry[3]
-        s3 -= carry[3] << 21
-        carry[5] = (s5 + (1 << 20)) >> 21
-        s6 += carry[5]
-        s5 -= carry[5] << 21
-        carry[7] = (s7 + (1 << 20)) >> 21
-        s8 += carry[7]
-        s7 -= carry[7] << 21
-        carry[9] = (s9 + (1 << 20)) >> 21
-        s10 += carry[9]
-        s9 -= carry[9] << 21
-        carry[11] = (s11 + (1 << 20)) >> 21
-        s12 += carry[11]
-        s11 -= carry[11] << 21
-        carry[13] = (s13 + (1 << 20)) >> 21
-        s14 += carry[13]
-        s13 -= carry[13] << 21
-        carry[15] = (s15 + (1 << 20)) >> 21
-        s16 += carry[15]
-        s15 -= carry[15] << 21
-        carry[17] = (s17 + (1 << 20)) >> 21
-        s18 += carry[17]
-        s17 -= carry[17] << 21
-        carry[19] = (s19 + (1 << 20)) >> 21
-        s20 += carry[19]
-        s19 -= carry[19] << 21
-        carry[21] = (s21 + (1 << 20)) >> 21
-        s22 += carry[21]
-        s21 -= carry[21] << 21
-
-        s11 += s23 * 666643
-        s12 += s23 * 470296
-        s13 += s23 * 654183
-        s14 -= s23 * 997805
-        s15 += s23 * 136657
-        s16 -= s23 * 683901
-        s23 = 0
-
-        s10 += s22 * 666643
-        s11 += s22 * 470296
-        s12 += s22 * 654183
-        s13 -= s22 * 997805
-        s14 += s22 * 136657
-        s15 -= s22 * 683901
-        s22 = 0
-
-        s9 += s21 * 666643
-        s10 += s21 * 470296
-        s11 += s21 * 654183
-        s12 -= s21 * 997805
-        s13 += s21 * 136657
-        s14 -= s21 * 683901
-        s21 = 0
-
-        s8 += s20 * 666643
-        s9 += s20 * 470296
-        s10 += s20 * 654183
-        s11 -= s20 * 997805
-        s12 += s20 * 136657
-        s13 -= s20 * 683901
-        s20 = 0
-
-        s7 += s19 * 666643
-        s8 += s19 * 470296
-        s9 += s19 * 654183
-        s10 -= s19 * 997805
-        s11 += s19 * 136657
-        s12 -= s19 * 683901
-        s19 = 0
-
-        s6 += s18 * 666643
-        s7 += s18 * 470296
-        s8 += s18 * 654183
-        s9 -= s18 * 997805
-        s10 += s18 * 136657
-        s11 -= s18 * 683901
-        s18 = 0
-
-        carry[6] = (s6 + (1 << 20)) >> 21
-        s7 += carry[6]
-        s6 -= carry[6] << 21
-        carry[8] = (s8 + (1 << 20)) >> 21
-        s9 += carry[8]
-        s8 -= carry[8] << 21
-        carry[10] = (s10 + (1 << 20)) >> 21
-        s11 += carry[10]
-        s10 -= carry[10] << 21
-        carry[12] = (s12 + (1 << 20)) >> 21
-        s13 += carry[12]
-        s12 -= carry[12] << 21
-        carry[14] = (s14 + (1 << 20)) >> 21
-        s15 += carry[14]
-        s14 -= carry[14] << 21
-        carry[16] = (s16 + (1 << 20)) >> 21
-        s17 += carry[16]
-        s16 -= carry[16] << 21
-
-        carry[7] = (s7 + (1 << 20)) >> 21
-        s8 += carry[7]
-        s7 -= carry[7] << 21
-        carry[9] = (s9 + (1 << 20)) >> 21
-        s10 += carry[9]
-        s9 -= carry[9] << 21
-        carry[11] = (s11 + (1 << 20)) >> 21
-        s12 += carry[11]
-        s11 -= carry[11] << 21
-        carry[13] = (s13 + (1 << 20)) >> 21
-        s14 += carry[13]
-        s13 -= carry[13] << 21
-        carry[15] = (s15 + (1 << 20)) >> 21
-        s16 += carry[15]
-        s15 -= carry[15] << 21
-
-        s5 += s17 * 666643
-        s6 += s17 * 470296
-        s7 += s17 * 654183
-        s8 -= s17 * 997805
-        s9 += s17 * 136657
-        s10 -= s17 * 683901
-        s17 = 0
-
-        s4 += s16 * 666643
-        s5 += s16 * 470296
-        s6 += s16 * 654183
-        s7 -= s16 * 997805
-        s8 += s16 * 136657
-        s9 -= s16 * 683901
-        s16 = 0
-
-        s3 += s15 * 666643
-        s4 += s15 * 470296
-        s5 += s15 * 654183
-        s6 -= s15 * 997805
-        s7 += s15 * 136657
-        s8 -= s15 * 683901
-        s15 = 0
-
-        s2 += s14 * 666643
-        s3 += s14 * 470296
-        s4 += s14 * 654183
-        s5 -= s14 * 997805
-        s6 += s14 * 136657
-        s7 -= s14 * 683901
-        s14 = 0
-
-        s1 += s13 * 666643
-        s2 += s13 * 470296
-        s3 += s13 * 654183
-        s4 -= s13 * 997805
-        s5 += s13 * 136657
-        s6 -= s13 * 683901
-        s13 = 0
-
-        s0 += s12 * 666643
-        s1 += s12 * 470296
-        s2 += s12 * 654183
-        s3 -= s12 * 997805
-        s4 += s12 * 136657
-        s5 -= s12 * 683901
-        s12 = 0
-
-        carry[0] = (s0 + (1 << 20)) >> 21
-        s1 += carry[0]
-        s0 -= carry[0] << 21
-        carry[2] = (s2 + (1 << 20)) >> 21
-        s3 += carry[2]
-        s2 -= carry[2] << 21
-        carry[4] = (s4 + (1 << 20)) >> 21
-        s5 += carry[4]
-        s4 -= carry[4] << 21
-        carry[6] = (s6 + (1 << 20)) >> 21
-        s7 += carry[6]
-        s6 -= carry[6] << 21
-        carry[8] = (s8 + (1 << 20)) >> 21
-        s9 += carry[8]
-        s8 -= carry[8] << 21
-        carry[10] = (s10 + (1 << 20)) >> 21
-        s11 += carry[10]
-        s10 -= carry[10] << 21
-
-        carry[1] = (s1 + (1 << 20)) >> 21
-        s2 += carry[1]
-        s1 -= carry[1] << 21
-        carry[3] = (s3 + (1 << 20)) >> 21
-        s4 += carry[3]
-        s3 -= carry[3] << 21
-        carry[5] = (s5 + (1 << 20)) >> 21
-        s6 += carry[5]
-        s5 -= carry[5] << 21
-        carry[7] = (s7 + (1 << 20)) >> 21
-        s8 += carry[7]
-        s7 -= carry[7] << 21
-        carry[9] = (s9 + (1 << 20)) >> 21
-        s10 += carry[9]
-        s9 -= carry[9] << 21
-        carry[11] = (s11 + (1 << 20)) >> 21
-        s12 += carry[11]
-        s11 -= carry[11] << 21
-
-        s0 += s12 * 666643
-        s1 += s12 * 470296
-        s2 += s12 * 654183
-        s3 -= s12 * 997805
-        s4 += s12 * 136657
-        s5 -= s12 * 683901
-        s12 = 0
-
-        carry[0] = s0 >> 21
-        s1 += carry[0]
-        s0 -= carry[0] << 21
-        carry[1] = s1 >> 21
-        s2 += carry[1]
-        s1 -= carry[1] << 21
-        carry[2] = s2 >> 21
-        s3 += carry[2]
-        s2 -= carry[2] << 21
-        carry[3] = s3 >> 21
-        s4 += carry[3]
-        s3 -= carry[3] << 21
-        carry[4] = s4 >> 21
-        s5 += carry[4]
-        s4 -= carry[4] << 21
-        carry[5] = s5 >> 21
-        s6 += carry[5]
-        s5 -= carry[5] << 21
-        carry[6] = s6 >> 21
-        s7 += carry[6]
-        s6 -= carry[6] << 21
-        carry[7] = s7 >> 21
-        s8 += carry[7]
-        s7 -= carry[7] << 21
-        carry[8] = s8 >> 21
-        s9 += carry[8]
-        s8 -= carry[8] << 21
-        carry[9] = s9 >> 21
-        s10 += carry[9]
-        s9 -= carry[9] << 21
-        carry[10] = s10 >> 21
-        s11 += carry[10]
-        s10 -= carry[10] << 21
-        carry[11] = s11 >> 21
-        s12 += carry[11]
-        s11 -= carry[11] << 21
-
-        s0 += s12 * 666643
-        s1 += s12 * 470296
-        s2 += s12 * 654183
-        s3 -= s12 * 997805
-        s4 += s12 * 136657
-        s5 -= s12 * 683901
-        s12 = 0
-
-        carry[0] = s0 >> 21
-        s1 += carry[0]
-        s0 -= carry[0] << 21
-        carry[1] = s1 >> 21
-        s2 += carry[1]
-        s1 -= carry[1] << 21
-        carry[2] = s2 >> 21
-        s3 += carry[2]
-        s2 -= carry[2] << 21
-        carry[3] = s3 >> 21
-        s4 += carry[3]
-        s3 -= carry[3] << 21
-        carry[4] = s4 >> 21
-        s5 += carry[4]
-        s4 -= carry[4] << 21
-        carry[5] = s5 >> 21
-        s6 += carry[5]
-        s5 -= carry[5] << 21
-        carry[6] = s6 >> 21
-        s7 += carry[6]
-        s6 -= carry[6] << 21
-        carry[7] = s7 >> 21
-        s8 += carry[7]
-        s7 -= carry[7] << 21
-        carry[8] = s8 >> 21
-        s9 += carry[8]
-        s8 -= carry[8] << 21
-        carry[9] = s9 >> 21
-        s10 += carry[9]
-        s9 -= carry[9] << 21
-        carry[10] = s10 >> 21
-        s11 += carry[10]
-        s10 -= carry[10] << 21
-
-        s[0] = byte(s0 >> 0)
-        s[1] = byte(s0 >> 8)
-        s[2] = byte((s0 >> 16) | (s1 << 5))
-        s[3] = byte(s1 >> 3)
-        s[4] = byte(s1 >> 11)
-        s[5] = byte((s1 >> 19) | (s2 << 2))
-        s[6] = byte(s2 >> 6)
-        s[7] = byte((s2 >> 14) | (s3 << 7))
-        s[8] = byte(s3 >> 1)
-        s[9] = byte(s3 >> 9)
-        s[10] = byte((s3 >> 17) | (s4 << 4))
-        s[11] = byte(s4 >> 4)
-        s[12] = byte(s4 >> 12)
-        s[13] = byte((s4 >> 20) | (s5 << 1))
-        s[14] = byte(s5 >> 7)
-        s[15] = byte((s5 >> 15) | (s6 << 6))
-        s[16] = byte(s6 >> 2)
-        s[17] = byte(s6 >> 10)
-        s[18] = byte((s6 >> 18) | (s7 << 3))
-        s[19] = byte(s7 >> 5)
-        s[20] = byte(s7 >> 13)
-        s[21] = byte(s8 >> 0)
-        s[22] = byte(s8 >> 8)
-        s[23] = byte((s8 >> 16) | (s9 << 5))
-        s[24] = byte(s9 >> 3)
-        s[25] = byte(s9 >> 11)
-        s[26] = byte((s9 >> 19) | (s10 << 2))
-        s[27] = byte(s10 >> 6)
-        s[28] = byte((s10 >> 14) | (s11 << 7))
-        s[29] = byte(s11 >> 1)
-        s[30] = byte(s11 >> 9)
-        s[31] = byte(s11 >> 17)
-}
-
-// Input:
-//   s[0]+256*s[1]+...+256^63*s[63] = s
-//
-// Output:
-//   s[0]+256*s[1]+...+256^31*s[31] = s mod l
-//   where l = 2^252 + 27742317777372353535851937790883648493.
-func ScReduce(out *[32]byte, s *[64]byte) {
-        s0 := 2097151 & load3(s[:])
-        s1 := 2097151 & (load4(s[2:]) >> 5)
-        s2 := 2097151 & (load3(s[5:]) >> 2)
-        s3 := 2097151 & (load4(s[7:]) >> 7)
-        s4 := 2097151 & (load4(s[10:]) >> 4)
-        s5 := 2097151 & (load3(s[13:]) >> 1)
-        s6 := 2097151 & (load4(s[15:]) >> 6)
-        s7 := 2097151 & (load3(s[18:]) >> 3)
-        s8 := 2097151 & load3(s[21:])
-        s9 := 2097151 & (load4(s[23:]) >> 5)
-        s10 := 2097151 & (load3(s[26:]) >> 2)
-        s11 := 2097151 & (load4(s[28:]) >> 7)
-        s12 := 2097151 & (load4(s[31:]) >> 4)
-        s13 := 2097151 & (load3(s[34:]) >> 1)
-        s14 := 2097151 & (load4(s[36:]) >> 6)
-        s15 := 2097151 & (load3(s[39:]) >> 3)
-        s16 := 2097151 & load3(s[42:])
-        s17 := 2097151 & (load4(s[44:]) >> 5)
-        s18 := 2097151 & (load3(s[47:]) >> 2)
-        s19 := 2097151 & (load4(s[49:]) >> 7)
-        s20 := 2097151 & (load4(s[52:]) >> 4)
-        s21 := 2097151 & (load3(s[55:]) >> 1)
-        s22 := 2097151 & (load4(s[57:]) >> 6)
-        s23 := (load4(s[60:]) >> 3)
-
-        s11 += s23 * 666643
-        s12 += s23 * 470296
-        s13 += s23 * 654183
-        s14 -= s23 * 997805
-        s15 += s23 * 136657
-        s16 -= s23 * 683901
-        s23 = 0
-
-        s10 += s22 * 666643
-        s11 += s22 * 470296
-        s12 += s22 * 654183
-        s13 -= s22 * 997805
-        s14 += s22 * 136657
-        s15 -= s22 * 683901
-        s22 = 0
-
-        s9 += s21 * 666643
-        s10 += s21 * 470296
-        s11 += s21 * 654183
-        s12 -= s21 * 997805
-        s13 += s21 * 136657
-        s14 -= s21 * 683901
-        s21 = 0
-
-        s8 += s20 * 666643
-        s9 += s20 * 470296
-        s10 += s20 * 654183
-        s11 -= s20 * 997805
-        s12 += s20 * 136657
-        s13 -= s20 * 683901
-        s20 = 0
-
-        s7 += s19 * 666643
-        s8 += s19 * 470296
-        s9 += s19 * 654183
-        s10 -= s19 * 997805
-        s11 += s19 * 136657
-        s12 -= s19 * 683901
-        s19 = 0
-
-        s6 += s18 * 666643
-        s7 += s18 * 470296
-        s8 += s18 * 654183
-        s9 -= s18 * 997805
-        s10 += s18 * 136657
-        s11 -= s18 * 683901
-        s18 = 0
-
-        var carry [17]int64
-
-        carry[6] = (s6 + (1 << 20)) >> 21
-        s7 += carry[6]
-        s6 -= carry[6] << 21
-        carry[8] = (s8 + (1 << 20)) >> 21
-        s9 += carry[8]
-        s8 -= carry[8] << 21
-        carry[10] = (s10 + (1 << 20)) >> 21
-        s11 += carry[10]
-        s10 -= carry[10] << 21
-        carry[12] = (s12 + (1 << 20)) >> 21
-        s13 += carry[12]
-        s12 -= carry[12] << 21
-        carry[14] = (s14 + (1 << 20)) >> 21
-        s15 += carry[14]
-        s14 -= carry[14] << 21
-        carry[16] = (s16 + (1 << 20)) >> 21
-        s17 += carry[16]
-        s16 -= carry[16] << 21
-
-        carry[7] = (s7 + (1 << 20)) >> 21
-        s8 += carry[7]
-        s7 -= carry[7] << 21
-        carry[9] = (s9 + (1 << 20)) >> 21
-        s10 += carry[9]
-        s9 -= carry[9] << 21
-        carry[11] = (s11 + (1 << 20)) >> 21
-        s12 += carry[11]
-        s11 -= carry[11] << 21
-        carry[13] = (s13 + (1 << 20)) >> 21
-        s14 += carry[13]
-        s13 -= carry[13] << 21
-        carry[15] = (s15 + (1 << 20)) >> 21
-        s16 += carry[15]
-        s15 -= carry[15] << 21
-
-        s5 += s17 * 666643
-        s6 += s17 * 470296
-        s7 += s17 * 654183
-        s8 -= s17 * 997805
-        s9 += s17 * 136657
-        s10 -= s17 * 683901
-        s17 = 0
-
-        s4 += s16 * 666643
-        s5 += s16 * 470296
-        s6 += s16 * 654183
-        s7 -= s16 * 997805
-        s8 += s16 * 136657
-        s9 -= s16 * 683901
-        s16 = 0
-
-        s3 += s15 * 666643
-        s4 += s15 * 470296
-        s5 += s15 * 654183
-        s6 -= s15 * 997805
-        s7 += s15 * 136657
-        s8 -= s15 * 683901
-        s15 = 0
-
-        s2 += s14 * 666643
-        s3 += s14 * 470296
-        s4 += s14 * 654183
-        s5 -= s14 * 997805
-        s6 += s14 * 136657
-        s7 -= s14 * 683901
-        s14 = 0
-
-        s1 += s13 * 666643
-        s2 += s13 * 470296
-        s3 += s13 * 654183
-        s4 -= s13 * 997805
-        s5 += s13 * 136657
-        s6 -= s13 * 683901
-        s13 = 0
-
-        s0 += s12 * 666643
-        s1 += s12 * 470296
-        s2 += s12 * 654183
-        s3 -= s12 * 997805
-        s4 += s12 * 136657
-        s5 -= s12 * 683901
-        s12 = 0
-
-        carry[0] = (s0 + (1 << 20)) >> 21
-        s1 += carry[0]
-        s0 -= carry[0] << 21
-        carry[2] = (s2 + (1 << 20)) >> 21
-        s3 += carry[2]
-        s2 -= carry[2] << 21
-        carry[4] = (s4 + (1 << 20)) >> 21
-        s5 += carry[4]
-        s4 -= carry[4] << 21
-        carry[6] = (s6 + (1 << 20)) >> 21
-        s7 += carry[6]
-        s6 -= carry[6] << 21
-        carry[8] = (s8 + (1 << 20)) >> 21
-        s9 += carry[8]
-        s8 -= carry[8] << 21
-        carry[10] = (s10 + (1 << 20)) >> 21
-        s11 += carry[10]
-        s10 -= carry[10] << 21
-
-        carry[1] = (s1 + (1 << 20)) >> 21
-        s2 += carry[1]
-        s1 -= carry[1] << 21
-        carry[3] = (s3 + (1 << 20)) >> 21
-        s4 += carry[3]
-        s3 -= carry[3] << 21
-        carry[5] = (s5 + (1 << 20)) >> 21
-        s6 += carry[5]
-        s5 -= carry[5] << 21
-        carry[7] = (s7 + (1 << 20)) >> 21
-        s8 += carry[7]
-        s7 -= carry[7] << 21
-        carry[9] = (s9 + (1 << 20)) >> 21
-        s10 += carry[9]
-        s9 -= carry[9] << 21
-        carry[11] = (s11 + (1 << 20)) >> 21
-        s12 += carry[11]
-        s11 -= carry[11] << 21
-
-        s0 += s12 * 666643
-        s1 += s12 * 470296
-        s2 += s12 * 654183
-        s3 -= s12 * 997805
-        s4 += s12 * 136657
-        s5 -= s12 * 683901
-        s12 = 0
-
-        carry[0] = s0 >> 21
-        s1 += carry[0]
-        s0 -= carry[0] << 21
-        carry[1] = s1 >> 21
-        s2 += carry[1]
-        s1 -= carry[1] << 21
-        carry[2] = s2 >> 21
-        s3 += carry[2]
-        s2 -= carry[2] << 21
-        carry[3] = s3 >> 21
-        s4 += carry[3]
-        s3 -= carry[3] << 21
-        carry[4] = s4 >> 21
-        s5 += carry[4]
-        s4 -= carry[4] << 21
-        carry[5] = s5 >> 21
-        s6 += carry[5]
-        s5 -= carry[5] << 21
-        carry[6] = s6 >> 21
-        s7 += carry[6]
-        s6 -= carry[6] << 21
-        carry[7] = s7 >> 21
-        s8 += carry[7]
-        s7 -= carry[7] << 21
-        carry[8] = s8 >> 21
-        s9 += carry[8]
-        s8 -= carry[8] << 21
-        carry[9] = s9 >> 21
-        s10 += carry[9]
-        s9 -= carry[9] << 21
-        carry[10] = s10 >> 21
-        s11 += carry[10]
-        s10 -= carry[10] << 21
-        carry[11] = s11 >> 21
-        s12 += carry[11]
-        s11 -= carry[11] << 21
-
-        s0 += s12 * 666643
-        s1 += s12 * 470296
-        s2 += s12 * 654183
-        s3 -= s12 * 997805
-        s4 += s12 * 136657
-        s5 -= s12 * 683901
-        s12 = 0
-
-        carry[0] = s0 >> 21
-        s1 += carry[0]
-        s0 -= carry[0] << 21
-        carry[1] = s1 >> 21
-        s2 += carry[1]
-        s1 -= carry[1] << 21
-        carry[2] = s2 >> 21
-        s3 += carry[2]
-        s2 -= carry[2] << 21
-        carry[3] = s3 >> 21
-        s4 += carry[3]
-        s3 -= carry[3] << 21
-        carry[4] = s4 >> 21
-        s5 += carry[4]
-        s4 -= carry[4] << 21
-        carry[5] = s5 >> 21
-        s6 += carry[5]
-        s5 -= carry[5] << 21
-        carry[6] = s6 >> 21
-        s7 += carry[6]
-        s6 -= carry[6] << 21
-        carry[7] = s7 >> 21
-        s8 += carry[7]
-        s7 -= carry[7] << 21
-        carry[8] = s8 >> 21
-        s9 += carry[8]
-        s8 -= carry[8] << 21
-        carry[9] = s9 >> 21
-        s10 += carry[9]
-        s9 -= carry[9] << 21
-        carry[10] = s10 >> 21
-        s11 += carry[10]
-        s10 -= carry[10] << 21
-
-        out[0] = byte(s0 >> 0)
-        out[1] = byte(s0 >> 8)
-        out[2] = byte((s0 >> 16) | (s1 << 5))
-        out[3] = byte(s1 >> 3)
-        out[4] = byte(s1 >> 11)
-        out[5] = byte((s1 >> 19) | (s2 << 2))
-        out[6] = byte(s2 >> 6)
-        out[7] = byte((s2 >> 14) | (s3 << 7))
-        out[8] = byte(s3 >> 1)
-        out[9] = byte(s3 >> 9)
-        out[10] = byte((s3 >> 17) | (s4 << 4))
-        out[11] = byte(s4 >> 4)
-        out[12] = byte(s4 >> 12)
-        out[13] = byte((s4 >> 20) | (s5 << 1))
-        out[14] = byte(s5 >> 7)
-        out[15] = byte((s5 >> 15) | (s6 << 6))
-        out[16] = byte(s6 >> 2)
-        out[17] = byte(s6 >> 10)
-        out[18] = byte((s6 >> 18) | (s7 << 3))
-        out[19] = byte(s7 >> 5)
-        out[20] = byte(s7 >> 13)
-        out[21] = byte(s8 >> 0)
-        out[22] = byte(s8 >> 8)
-        out[23] = byte((s8 >> 16) | (s9 << 5))
-        out[24] = byte(s9 >> 3)
-        out[25] = byte(s9 >> 11)
-        out[26] = byte((s9 >> 19) | (s10 << 2))
-        out[27] = byte(s10 >> 6)
-        out[28] = byte((s10 >> 14) | (s11 << 7))
-        out[29] = byte(s11 >> 1)
-        out[30] = byte(s11 >> 9)
-        out[31] = byte(s11 >> 17)
-}
diff --git a/vendor/golang.org/x/crypto/ssh/buffer.go b/vendor/golang.org/x/crypto/ssh/buffer.go
deleted file mode 100644
index 6931b51..0000000
--- a/vendor/golang.org/x/crypto/ssh/buffer.go
+++ /dev/null
@@ -1,98 +0,0 @@
-// 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 ssh
-
-import (
-        "io"
-        "sync"
-)
-
-// buffer provides a linked list buffer for data exchange
-// between producer and consumer. Theoretically the buffer is
-// of unlimited capacity as it does no allocation of its own.
-type buffer struct {
-        // protects concurrent access to head, tail and closed
-        *sync.Cond
-
-        head *element // the buffer that will be read first
-        tail *element // the buffer that will be read last
-
-        closed bool
-}
-
-// An element represents a single link in a linked list.
-type element struct {
-        buf  []byte
-        next *element
-}
-
-// newBuffer returns an empty buffer that is not closed.
-func newBuffer() *buffer {
-        e := new(element)
-        b := &buffer{
-                Cond: newCond(),
-                head: e,
-                tail: e,
-        }
-        return b
-}
-
-// write makes buf available for Read to receive.
-// buf must not be modified after the call to write.
-func (b *buffer) write(buf []byte) {
-        b.Cond.L.Lock()
-        e := &element{buf: buf}
-        b.tail.next = e
-        b.tail = e
-        b.Cond.Signal()
-        b.Cond.L.Unlock()
-}
-
-// eof closes the buffer. Reads from the buffer once all
-// the data has been consumed will receive os.EOF.
-func (b *buffer) eof() error {
-        b.Cond.L.Lock()
-        b.closed = true
-        b.Cond.Signal()
-        b.Cond.L.Unlock()
-        return nil
-}
-
-// Read reads data from the internal buffer in buf.  Reads will block
-// if no data is available, or until the buffer is closed.
-func (b *buffer) Read(buf []byte) (n int, err error) {
-        b.Cond.L.Lock()
-        defer b.Cond.L.Unlock()
-
-        for len(buf) > 0 {
-                // if there is data in b.head, copy it
-                if len(b.head.buf) > 0 {
-                        r := copy(buf, b.head.buf)
-                        buf, b.head.buf = buf[r:], b.head.buf[r:]
-                        n += r
-                        continue
-                }
-                // if there is a next buffer, make it the head
-                if len(b.head.buf) == 0 && b.head != b.tail {
-                        b.head = b.head.next
-                        continue
-                }
-
-                // if at least one byte has been copied, return
-                if n > 0 {
-                        break
-                }
-
-                // if nothing was read, and there is nothing outstanding
-                // check to see if the buffer is closed.
-                if b.closed {
-                        err = io.EOF
-                        break
-                }
-                // out of buffers, wait for producer
-                b.Cond.Wait()
-        }
-        return
-}
diff --git a/vendor/golang.org/x/crypto/ssh/certs.go b/vendor/golang.org/x/crypto/ssh/certs.go
deleted file mode 100644
index 6331c94..0000000
--- a/vendor/golang.org/x/crypto/ssh/certs.go
+++ /dev/null
@@ -1,503 +0,0 @@
-// 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 ssh
-
-import (
-        "bytes"
-        "errors"
-        "fmt"
-        "io"
-        "net"
-        "sort"
-        "time"
-)
-
-// These constants from [PROTOCOL.certkeys] represent the algorithm names
-// for certificate types supported by this package.
-const (
-        CertAlgoRSAv01      = "ssh-rsa-cert-v01@openssh.com"
-        CertAlgoDSAv01      = "ssh-dss-cert-v01@openssh.com"
-        CertAlgoECDSA256v01 = "ecdsa-sha2-nistp256-cert-v01@openssh.com"
-        CertAlgoECDSA384v01 = "ecdsa-sha2-nistp384-cert-v01@openssh.com"
-        CertAlgoECDSA521v01 = "ecdsa-sha2-nistp521-cert-v01@openssh.com"
-        CertAlgoED25519v01  = "ssh-ed25519-cert-v01@openssh.com"
-)
-
-// Certificate types distinguish between host and user
-// certificates. The values can be set in the CertType field of
-// Certificate.
-const (
-        UserCert = 1
-        HostCert = 2
-)
-
-// Signature represents a cryptographic signature.
-type Signature struct {
-        Format string
-        Blob   []byte
-}
-
-// CertTimeInfinity can be used for OpenSSHCertV01.ValidBefore to indicate that
-// a certificate does not expire.
-const CertTimeInfinity = 1<<64 - 1
-
-// An Certificate represents an OpenSSH certificate as defined in
-// [PROTOCOL.certkeys]?rev=1.8.
-type Certificate struct {
-        Nonce           []byte
-        Key             PublicKey
-        Serial          uint64
-        CertType        uint32
-        KeyId           string
-        ValidPrincipals []string
-        ValidAfter      uint64
-        ValidBefore     uint64
-        Permissions
-        Reserved     []byte
-        SignatureKey PublicKey
-        Signature    *Signature
-}
-
-// genericCertData holds the key-independent part of the certificate data.
-// Overall, certificates contain an nonce, public key fields and
-// key-independent fields.
-type genericCertData struct {
-        Serial          uint64
-        CertType        uint32
-        KeyId           string
-        ValidPrincipals []byte
-        ValidAfter      uint64
-        ValidBefore     uint64
-        CriticalOptions []byte
-        Extensions      []byte
-        Reserved        []byte
-        SignatureKey    []byte
-        Signature       []byte
-}
-
-func marshalStringList(namelist []string) []byte {
-        var to []byte
-        for _, name := range namelist {
-                s := struct{ N string }{name}
-                to = append(to, Marshal(&s)...)
-        }
-        return to
-}
-
-type optionsTuple struct {
-        Key   string
-        Value []byte
-}
-
-type optionsTupleValue struct {
-        Value string
-}
-
-// serialize a map of critical options or extensions
-// issue #10569 - per [PROTOCOL.certkeys] and SSH implementation,
-// we need two length prefixes for a non-empty string value
-func marshalTuples(tups map[string]string) []byte {
-        keys := make([]string, 0, len(tups))
-        for key := range tups {
-                keys = append(keys, key)
-        }
-        sort.Strings(keys)
-
-        var ret []byte
-        for _, key := range keys {
-                s := optionsTuple{Key: key}
-                if value := tups[key]; len(value) > 0 {
-                        s.Value = Marshal(&optionsTupleValue{value})
-                }
-                ret = append(ret, Marshal(&s)...)
-        }
-        return ret
-}
-
-// issue #10569 - per [PROTOCOL.certkeys] and SSH implementation,
-// we need two length prefixes for a non-empty option value
-func parseTuples(in []byte) (map[string]string, error) {
-        tups := map[string]string{}
-        var lastKey string
-        var haveLastKey bool
-
-        for len(in) > 0 {
-                var key, val, extra []byte
-                var ok bool
-
-                if key, in, ok = parseString(in); !ok {
-                        return nil, errShortRead
-                }
-                keyStr := string(key)
-                // according to [PROTOCOL.certkeys], the names must be in
-                // lexical order.
-                if haveLastKey && keyStr <= lastKey {
-                        return nil, fmt.Errorf("ssh: certificate options are not in lexical order")
-                }
-                lastKey, haveLastKey = keyStr, true
-                // the next field is a data field, which if non-empty has a string embedded
-                if val, in, ok = parseString(in); !ok {
-                        return nil, errShortRead
-                }
-                if len(val) > 0 {
-                        val, extra, ok = parseString(val)
-                        if !ok {
-                                return nil, errShortRead
-                        }
-                        if len(extra) > 0 {
-                                return nil, fmt.Errorf("ssh: unexpected trailing data after certificate option value")
-                        }
-                        tups[keyStr] = string(val)
-                } else {
-                        tups[keyStr] = ""
-                }
-        }
-        return tups, nil
-}
-
-func parseCert(in []byte, privAlgo string) (*Certificate, error) {
-        nonce, rest, ok := parseString(in)
-        if !ok {
-                return nil, errShortRead
-        }
-
-        key, rest, err := parsePubKey(rest, privAlgo)
-        if err != nil {
-                return nil, err
-        }
-
-        var g genericCertData
-        if err := Unmarshal(rest, &g); err != nil {
-                return nil, err
-        }
-
-        c := &Certificate{
-                Nonce:       nonce,
-                Key:         key,
-                Serial:      g.Serial,
-                CertType:    g.CertType,
-                KeyId:       g.KeyId,
-                ValidAfter:  g.ValidAfter,
-                ValidBefore: g.ValidBefore,
-        }
-
-        for principals := g.ValidPrincipals; len(principals) > 0; {
-                principal, rest, ok := parseString(principals)
-                if !ok {
-                        return nil, errShortRead
-                }
-                c.ValidPrincipals = append(c.ValidPrincipals, string(principal))
-                principals = rest
-        }
-
-        c.CriticalOptions, err = parseTuples(g.CriticalOptions)
-        if err != nil {
-                return nil, err
-        }
-        c.Extensions, err = parseTuples(g.Extensions)
-        if err != nil {
-                return nil, err
-        }
-        c.Reserved = g.Reserved
-        k, err := ParsePublicKey(g.SignatureKey)
-        if err != nil {
-                return nil, err
-        }
-
-        c.SignatureKey = k
-        c.Signature, rest, ok = parseSignatureBody(g.Signature)
-        if !ok || len(rest) > 0 {
-                return nil, errors.New("ssh: signature parse error")
-        }
-
-        return c, nil
-}
-
-type openSSHCertSigner struct {
-        pub    *Certificate
-        signer Signer
-}
-
-// NewCertSigner returns a Signer that signs with the given Certificate, whose
-// private key is held by signer. It returns an error if the public key in cert
-// doesn't match the key used by signer.
-func NewCertSigner(cert *Certificate, signer Signer) (Signer, error) {
-        if bytes.Compare(cert.Key.Marshal(), signer.PublicKey().Marshal()) != 0 {
-                return nil, errors.New("ssh: signer and cert have different public key")
-        }
-
-        return &openSSHCertSigner{cert, signer}, nil
-}
-
-func (s *openSSHCertSigner) Sign(rand io.Reader, data []byte) (*Signature, error) {
-        return s.signer.Sign(rand, data)
-}
-
-func (s *openSSHCertSigner) PublicKey() PublicKey {
-        return s.pub
-}
-
-const sourceAddressCriticalOption = "source-address"
-
-// CertChecker does the work of verifying a certificate. Its methods
-// can be plugged into ClientConfig.HostKeyCallback and
-// ServerConfig.PublicKeyCallback. For the CertChecker to work,
-// minimally, the IsAuthority callback should be set.
-type CertChecker struct {
-        // SupportedCriticalOptions lists the CriticalOptions that the
-        // server application layer understands. These are only used
-        // for user certificates.
-        SupportedCriticalOptions []string
-
-        // IsAuthority should return true if the key is recognized as
-        // an authority. This allows for certificates to be signed by other
-        // certificates.
-        IsAuthority func(auth PublicKey) bool
-
-        // Clock is used for verifying time stamps. If nil, time.Now
-        // is used.
-        Clock func() time.Time
-
-        // UserKeyFallback is called when CertChecker.Authenticate encounters a
-        // public key that is not a certificate. It must implement validation
-        // of user keys or else, if nil, all such keys are rejected.
-        UserKeyFallback func(conn ConnMetadata, key PublicKey) (*Permissions, error)
-
-        // HostKeyFallback is called when CertChecker.CheckHostKey encounters a
-        // public key that is not a certificate. It must implement host key
-        // validation or else, if nil, all such keys are rejected.
-        HostKeyFallback func(addr string, remote net.Addr, key PublicKey) error
-
-        // IsRevoked is called for each certificate so that revocation checking
-        // can be implemented. It should return true if the given certificate
-        // is revoked and false otherwise. If nil, no certificates are
-        // considered to have been revoked.
-        IsRevoked func(cert *Certificate) bool
-}
-
-// CheckHostKey checks a host key certificate. This method can be
-// plugged into ClientConfig.HostKeyCallback.
-func (c *CertChecker) CheckHostKey(addr string, remote net.Addr, key PublicKey) error {
-        cert, ok := key.(*Certificate)
-        if !ok {
-                if c.HostKeyFallback != nil {
-                        return c.HostKeyFallback(addr, remote, key)
-                }
-                return errors.New("ssh: non-certificate host key")
-        }
-        if cert.CertType != HostCert {
-                return fmt.Errorf("ssh: certificate presented as a host key has type %d", cert.CertType)
-        }
-
-        return c.CheckCert(addr, cert)
-}
-
-// Authenticate checks a user certificate. Authenticate can be used as
-// a value for ServerConfig.PublicKeyCallback.
-func (c *CertChecker) Authenticate(conn ConnMetadata, pubKey PublicKey) (*Permissions, error) {
-        cert, ok := pubKey.(*Certificate)
-        if !ok {
-                if c.UserKeyFallback != nil {
-                        return c.UserKeyFallback(conn, pubKey)
-                }
-                return nil, errors.New("ssh: normal key pairs not accepted")
-        }
-
-        if cert.CertType != UserCert {
-                return nil, fmt.Errorf("ssh: cert has type %d", cert.CertType)
-        }
-
-        if err := c.CheckCert(conn.User(), cert); err != nil {
-                return nil, err
-        }
-
-        return &cert.Permissions, nil
-}
-
-// CheckCert checks CriticalOptions, ValidPrincipals, revocation, timestamp and
-// the signature of the certificate.
-func (c *CertChecker) CheckCert(principal string, cert *Certificate) error {
-        if c.IsRevoked != nil && c.IsRevoked(cert) {
-                return fmt.Errorf("ssh: certicate serial %d revoked", cert.Serial)
-        }
-
-        for opt, _ := range cert.CriticalOptions {
-                // sourceAddressCriticalOption will be enforced by
-                // serverAuthenticate
-                if opt == sourceAddressCriticalOption {
-                        continue
-                }
-
-                found := false
-                for _, supp := range c.SupportedCriticalOptions {
-                        if supp == opt {
-                                found = true
-                                break
-                        }
-                }
-                if !found {
-                        return fmt.Errorf("ssh: unsupported critical option %q in certificate", opt)
-                }
-        }
-
-        if len(cert.ValidPrincipals) > 0 {
-                // By default, certs are valid for all users/hosts.
-                found := false
-                for _, p := range cert.ValidPrincipals {
-                        if p == principal {
-                                found = true
-                                break
-                        }
-                }
-                if !found {
-                        return fmt.Errorf("ssh: principal %q not in the set of valid principals for given certificate: %q", principal, cert.ValidPrincipals)
-                }
-        }
-
-        if !c.IsAuthority(cert.SignatureKey) {
-                return fmt.Errorf("ssh: certificate signed by unrecognized authority")
-        }
-
-        clock := c.Clock
-        if clock == nil {
-                clock = time.Now
-        }
-
-        unixNow := clock().Unix()
-        if after := int64(cert.ValidAfter); after < 0 || unixNow < int64(cert.ValidAfter) {
-                return fmt.Errorf("ssh: cert is not yet valid")
-        }
-        if before := int64(cert.ValidBefore); cert.ValidBefore != uint64(CertTimeInfinity) && (unixNow >= before || before < 0) {
-                return fmt.Errorf("ssh: cert has expired")
-        }
-        if err := cert.SignatureKey.Verify(cert.bytesForSigning(), cert.Signature); err != nil {
-                return fmt.Errorf("ssh: certificate signature does not verify")
-        }
-
-        return nil
-}
-
-// SignCert sets c.SignatureKey to the authority's public key and stores a
-// Signature, by authority, in the certificate.
-func (c *Certificate) SignCert(rand io.Reader, authority Signer) error {
-        c.Nonce = make([]byte, 32)
-        if _, err := io.ReadFull(rand, c.Nonce); err != nil {
-                return err
-        }
-        c.SignatureKey = authority.PublicKey()
-
-        sig, err := authority.Sign(rand, c.bytesForSigning())
-        if err != nil {
-                return err
-        }
-        c.Signature = sig
-        return nil
-}
-
-var certAlgoNames = map[string]string{
-        KeyAlgoRSA:      CertAlgoRSAv01,
-        KeyAlgoDSA:      CertAlgoDSAv01,
-        KeyAlgoECDSA256: CertAlgoECDSA256v01,
-        KeyAlgoECDSA384: CertAlgoECDSA384v01,
-        KeyAlgoECDSA521: CertAlgoECDSA521v01,
-        KeyAlgoED25519:  CertAlgoED25519v01,
-}
-
-// certToPrivAlgo returns the underlying algorithm for a certificate algorithm.
-// Panics if a non-certificate algorithm is passed.
-func certToPrivAlgo(algo string) string {
-        for privAlgo, pubAlgo := range certAlgoNames {
-                if pubAlgo == algo {
-                        return privAlgo
-                }
-        }
-        panic("unknown cert algorithm")
-}
-
-func (cert *Certificate) bytesForSigning() []byte {
-        c2 := *cert
-        c2.Signature = nil
-        out := c2.Marshal()
-        // Drop trailing signature length.
-        return out[:len(out)-4]
-}
-
-// Marshal serializes c into OpenSSH's wire format. It is part of the
-// PublicKey interface.
-func (c *Certificate) Marshal() []byte {
-        generic := genericCertData{
-                Serial:          c.Serial,
-                CertType:        c.CertType,
-                KeyId:           c.KeyId,
-                ValidPrincipals: marshalStringList(c.ValidPrincipals),
-                ValidAfter:      uint64(c.ValidAfter),
-                ValidBefore:     uint64(c.ValidBefore),
-                CriticalOptions: marshalTuples(c.CriticalOptions),
-                Extensions:      marshalTuples(c.Extensions),
-                Reserved:        c.Reserved,
-                SignatureKey:    c.SignatureKey.Marshal(),
-        }
-        if c.Signature != nil {
-                generic.Signature = Marshal(c.Signature)
-        }
-        genericBytes := Marshal(&generic)
-        keyBytes := c.Key.Marshal()
-        _, keyBytes, _ = parseString(keyBytes)
-        prefix := Marshal(&struct {
-                Name  string
-                Nonce []byte
-                Key   []byte `ssh:"rest"`
-        }{c.Type(), c.Nonce, keyBytes})
-
-        result := make([]byte, 0, len(prefix)+len(genericBytes))
-        result = append(result, prefix...)
-        result = append(result, genericBytes...)
-        return result
-}
-
-// Type returns the key name. It is part of the PublicKey interface.
-func (c *Certificate) Type() string {
-        algo, ok := certAlgoNames[c.Key.Type()]
-        if !ok {
-                panic("unknown cert key type " + c.Key.Type())
-        }
-        return algo
-}
-
-// Verify verifies a signature against the certificate's public
-// key. It is part of the PublicKey interface.
-func (c *Certificate) Verify(data []byte, sig *Signature) error {
-        return c.Key.Verify(data, sig)
-}
-
-func parseSignatureBody(in []byte) (out *Signature, rest []byte, ok bool) {
-        format, in, ok := parseString(in)
-        if !ok {
-                return
-        }
-
-        out = &Signature{
-                Format: string(format),
-        }
-
-        if out.Blob, in, ok = parseString(in); !ok {
-                return
-        }
-
-        return out, in, ok
-}
-
-func parseSignature(in []byte) (out *Signature, rest []byte, ok bool) {
-        sigBytes, rest, ok := parseString(in)
-        if !ok {
-                return
-        }
-
-        out, trailing, ok := parseSignatureBody(sigBytes)
-        if !ok || len(trailing) > 0 {
-                return nil, nil, false
-        }
-        return
-}
diff --git a/vendor/golang.org/x/crypto/ssh/channel.go b/vendor/golang.org/x/crypto/ssh/channel.go
deleted file mode 100644
index 195530e..0000000
--- a/vendor/golang.org/x/crypto/ssh/channel.go
+++ /dev/null
@@ -1,633 +0,0 @@
-// 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 ssh
-
-import (
-        "encoding/binary"
-        "errors"
-        "fmt"
-        "io"
-        "log"
-        "sync"
-)
-
-const (
-        minPacketLength = 9
-        // channelMaxPacket contains the maximum number of bytes that will be
-        // sent in a single packet. As per RFC 4253, section 6.1, 32k is also
-        // the minimum.
-        channelMaxPacket = 1 << 15
-        // We follow OpenSSH here.
-        channelWindowSize = 64 * channelMaxPacket
-)
-
-// NewChannel represents an incoming request to a channel. It must either be
-// accepted for use by calling Accept, or rejected by calling Reject.
-type NewChannel interface {
-        // Accept accepts the channel creation request. It returns the Channel
-        // and a Go channel containing SSH requests. The Go channel must be
-        // serviced otherwise the Channel will hang.
-        Accept() (Channel, <-chan *Request, error)
-
-        // Reject rejects the channel creation request. After calling
-        // this, no other methods on the Channel may be called.
-        Reject(reason RejectionReason, message string) error
-
-        // ChannelType returns the type of the channel, as supplied by the
-        // client.
-        ChannelType() string
-
-        // ExtraData returns the arbitrary payload for this channel, as supplied
-        // by the client. This data is specific to the channel type.
-        ExtraData() []byte
-}
-
-// A Channel is an ordered, reliable, flow-controlled, duplex stream
-// that is multiplexed over an SSH connection.
-type Channel interface {
-        // Read reads up to len(data) bytes from the channel.
-        Read(data []byte) (int, error)
-
-        // Write writes len(data) bytes to the channel.
-        Write(data []byte) (int, error)
-
-        // Close signals end of channel use. No data may be sent after this
-        // call.
-        Close() error
-
-        // CloseWrite signals the end of sending in-band
-        // data. Requests may still be sent, and the other side may
-        // still send data
-        CloseWrite() error
-
-        // SendRequest sends a channel request.  If wantReply is true,
-        // it will wait for a reply and return the result as a
-        // boolean, otherwise the return value will be false. Channel
-        // requests are out-of-band messages so they may be sent even
-        // if the data stream is closed or blocked by flow control.
-        // If the channel is closed before a reply is returned, io.EOF
-        // is returned.
-        SendRequest(name string, wantReply bool, payload []byte) (bool, error)
-
-        // Stderr returns an io.ReadWriter that writes to this channel
-        // with the extended data type set to stderr. Stderr may
-        // safely be read and written from a different goroutine than
-        // Read and Write respectively.
-        Stderr() io.ReadWriter
-}
-
-// Request is a request sent outside of the normal stream of
-// data. Requests can either be specific to an SSH channel, or they
-// can be global.
-type Request struct {
-        Type      string
-        WantReply bool
-        Payload   []byte
-
-        ch  *channel
-        mux *mux
-}
-
-// Reply sends a response to a request. It must be called for all requests
-// where WantReply is true and is a no-op otherwise. The payload argument is
-// ignored for replies to channel-specific requests.
-func (r *Request) Reply(ok bool, payload []byte) error {
-        if !r.WantReply {
-                return nil
-        }
-
-        if r.ch == nil {
-                return r.mux.ackRequest(ok, payload)
-        }
-
-        return r.ch.ackRequest(ok)
-}
-
-// RejectionReason is an enumeration used when rejecting channel creation
-// requests. See RFC 4254, section 5.1.
-type RejectionReason uint32
-
-const (
-        Prohibited RejectionReason = iota + 1
-        ConnectionFailed
-        UnknownChannelType
-        ResourceShortage
-)
-
-// String converts the rejection reason to human readable form.
-func (r RejectionReason) String() string {
-        switch r {
-        case Prohibited:
-                return "administratively prohibited"
-        case ConnectionFailed:
-                return "connect failed"
-        case UnknownChannelType:
-                return "unknown channel type"
-        case ResourceShortage:
-                return "resource shortage"
-        }
-        return fmt.Sprintf("unknown reason %d", int(r))
-}
-
-func min(a uint32, b int) uint32 {
-        if a < uint32(b) {
-                return a
-        }
-        return uint32(b)
-}
-
-type channelDirection uint8
-
-const (
-        channelInbound channelDirection = iota
-        channelOutbound
-)
-
-// channel is an implementation of the Channel interface that works
-// with the mux class.
-type channel struct {
-        // R/O after creation
-        chanType          string
-        extraData         []byte
-        localId, remoteId uint32
-
-        // maxIncomingPayload and maxRemotePayload are the maximum
-        // payload sizes of normal and extended data packets for
-        // receiving and sending, respectively. The wire packet will
-        // be 9 or 13 bytes larger (excluding encryption overhead).
-        maxIncomingPayload uint32
-        maxRemotePayload   uint32
-
-        mux *mux
-
-        // decided is set to true if an accept or reject message has been sent
-        // (for outbound channels) or received (for inbound channels).
-        decided bool
-
-        // direction contains either channelOutbound, for channels created
-        // locally, or channelInbound, for channels created by the peer.
-        direction channelDirection
-
-        // Pending internal channel messages.
-        msg chan interface{}
-
-        // Since requests have no ID, there can be only one request
-        // with WantReply=true outstanding.  This lock is held by a
-        // goroutine that has such an outgoing request pending.
-        sentRequestMu sync.Mutex
-
-        incomingRequests chan *Request
-
-        sentEOF bool
-
-        // thread-safe data
-        remoteWin  window
-        pending    *buffer
-        extPending *buffer
-
-        // windowMu protects myWindow, the flow-control window.
-        windowMu sync.Mutex
-        myWindow uint32
-
-        // writeMu serializes calls to mux.conn.writePacket() and
-        // protects sentClose and packetPool. This mutex must be
-        // different from windowMu, as writePacket can block if there
-        // is a key exchange pending.
-        writeMu   sync.Mutex
-        sentClose bool
-
-        // packetPool has a buffer for each extended channel ID to
-        // save allocations during writes.
-        packetPool map[uint32][]byte
-}
-
-// writePacket sends a packet. If the packet is a channel close, it updates
-// sentClose. This method takes the lock c.writeMu.
-func (c *channel) writePacket(packet []byte) error {
-        c.writeMu.Lock()
-        if c.sentClose {
-                c.writeMu.Unlock()
-                return io.EOF
-        }
-        c.sentClose = (packet[0] == msgChannelClose)
-        err := c.mux.conn.writePacket(packet)
-        c.writeMu.Unlock()
-        return err
-}
-
-func (c *channel) sendMessage(msg interface{}) error {
-        if debugMux {
-                log.Printf("send(%d): %#v", c.mux.chanList.offset, msg)
-        }
-
-        p := Marshal(msg)
-        binary.BigEndian.PutUint32(p[1:], c.remoteId)
-        return c.writePacket(p)
-}
-
-// WriteExtended writes data to a specific extended stream. These streams are
-// used, for example, for stderr.
-func (c *channel) WriteExtended(data []byte, extendedCode uint32) (n int, err error) {
-        if c.sentEOF {
-                return 0, io.EOF
-        }
-        // 1 byte message type, 4 bytes remoteId, 4 bytes data length
-        opCode := byte(msgChannelData)
-        headerLength := uint32(9)
-        if extendedCode > 0 {
-                headerLength += 4
-                opCode = msgChannelExtendedData
-        }
-
-        c.writeMu.Lock()
-        packet := c.packetPool[extendedCode]
-        // We don't remove the buffer from packetPool, so
-        // WriteExtended calls from different goroutines will be
-        // flagged as errors by the race detector.
-        c.writeMu.Unlock()
-
-        for len(data) > 0 {
-                space := min(c.maxRemotePayload, len(data))
-                if space, err = c.remoteWin.reserve(space); err != nil {
-                        return n, err
-                }
-                if want := headerLength + space; uint32(cap(packet)) < want {
-                        packet = make([]byte, want)
-                } else {
-                        packet = packet[:want]
-                }
-
-                todo := data[:space]
-
-                packet[0] = opCode
-                binary.BigEndian.PutUint32(packet[1:], c.remoteId)
-                if extendedCode > 0 {
-                        binary.BigEndian.PutUint32(packet[5:], uint32(extendedCode))
-                }
-                binary.BigEndian.PutUint32(packet[headerLength-4:], uint32(len(todo)))
-                copy(packet[headerLength:], todo)
-                if err = c.writePacket(packet); err != nil {
-                        return n, err
-                }
-
-                n += len(todo)
-                data = data[len(todo):]
-        }
-
-        c.writeMu.Lock()
-        c.packetPool[extendedCode] = packet
-        c.writeMu.Unlock()
-
-        return n, err
-}
-
-func (c *channel) handleData(packet []byte) error {
-        headerLen := 9
-        isExtendedData := packet[0] == msgChannelExtendedData
-        if isExtendedData {
-                headerLen = 13
-        }
-        if len(packet) < headerLen {
-                // malformed data packet
-                return parseError(packet[0])
-        }
-
-        var extended uint32
-        if isExtendedData {
-                extended = binary.BigEndian.Uint32(packet[5:])
-        }
-
-        length := binary.BigEndian.Uint32(packet[headerLen-4 : headerLen])
-        if length == 0 {
-                return nil
-        }
-        if length > c.maxIncomingPayload {
-                // TODO(hanwen): should send Disconnect?
-                return errors.New("ssh: incoming packet exceeds maximum payload size")
-        }
-
-        data := packet[headerLen:]
-        if length != uint32(len(data)) {
-                return errors.New("ssh: wrong packet length")
-        }
-
-        c.windowMu.Lock()
-        if c.myWindow < length {
-                c.windowMu.Unlock()
-                // TODO(hanwen): should send Disconnect with reason?
-                return errors.New("ssh: remote side wrote too much")
-        }
-        c.myWindow -= length
-        c.windowMu.Unlock()
-
-        if extended == 1 {
-                c.extPending.write(data)
-        } else if extended > 0 {
-                // discard other extended data.
-        } else {
-                c.pending.write(data)
-        }
-        return nil
-}
-
-func (c *channel) adjustWindow(n uint32) error {
-        c.windowMu.Lock()
-        // Since myWindow is managed on our side, and can never exceed
-        // the initial window setting, we don't worry about overflow.
-        c.myWindow += uint32(n)
-        c.windowMu.Unlock()
-        return c.sendMessage(windowAdjustMsg{
-                AdditionalBytes: uint32(n),
-        })
-}
-
-func (c *channel) ReadExtended(data []byte, extended uint32) (n int, err error) {
-        switch extended {
-        case 1:
-                n, err = c.extPending.Read(data)
-        case 0:
-                n, err = c.pending.Read(data)
-        default:
-                return 0, fmt.Errorf("ssh: extended code %d unimplemented", extended)
-        }
-
-        if n > 0 {
-                err = c.adjustWindow(uint32(n))
-                // sendWindowAdjust can return io.EOF if the remote
-                // peer has closed the connection, however we want to
-                // defer forwarding io.EOF to the caller of Read until
-                // the buffer has been drained.
-                if n > 0 && err == io.EOF {
-                        err = nil
-                }
-        }
-
-        return n, err
-}
-
-func (c *channel) close() {
-        c.pending.eof()
-        c.extPending.eof()
-        close(c.msg)
-        close(c.incomingRequests)
-        c.writeMu.Lock()
-        // This is not necessary for a normal channel teardown, but if
-        // there was another error, it is.
-        c.sentClose = true
-        c.writeMu.Unlock()
-        // Unblock writers.
-        c.remoteWin.close()
-}
-
-// responseMessageReceived is called when a success or failure message is
-// received on a channel to check that such a message is reasonable for the
-// given channel.
-func (c *channel) responseMessageReceived() error {
-        if c.direction == channelInbound {
-                return errors.New("ssh: channel response message received on inbound channel")
-        }
-        if c.decided {
-                return errors.New("ssh: duplicate response received for channel")
-        }
-        c.decided = true
-        return nil
-}
-
-func (c *channel) handlePacket(packet []byte) error {
-        switch packet[0] {
-        case msgChannelData, msgChannelExtendedData:
-                return c.handleData(packet)
-        case msgChannelClose:
-                c.sendMessage(channelCloseMsg{PeersId: c.remoteId})
-                c.mux.chanList.remove(c.localId)
-                c.close()
-                return nil
-        case msgChannelEOF:
-                // RFC 4254 is mute on how EOF affects dataExt messages but
-                // it is logical to signal EOF at the same time.
-                c.extPending.eof()
-                c.pending.eof()
-                return nil
-        }
-
-        decoded, err := decode(packet)
-        if err != nil {
-                return err
-        }
-
-        switch msg := decoded.(type) {
-        case *channelOpenFailureMsg:
-                if err := c.responseMessageReceived(); err != nil {
-                        return err
-                }
-                c.mux.chanList.remove(msg.PeersId)
-                c.msg <- msg
-        case *channelOpenConfirmMsg:
-                if err := c.responseMessageReceived(); err != nil {
-                        return err
-                }
-                if msg.MaxPacketSize < minPacketLength || msg.MaxPacketSize > 1<<31 {
-                        return fmt.Errorf("ssh: invalid MaxPacketSize %d from peer", msg.MaxPacketSize)
-                }
-                c.remoteId = msg.MyId
-                c.maxRemotePayload = msg.MaxPacketSize
-                c.remoteWin.add(msg.MyWindow)
-                c.msg <- msg
-        case *windowAdjustMsg:
-                if !c.remoteWin.add(msg.AdditionalBytes) {
-                        return fmt.Errorf("ssh: invalid window update for %d bytes", msg.AdditionalBytes)
-                }
-        case *channelRequestMsg:
-                req := Request{
-                        Type:      msg.Request,
-                        WantReply: msg.WantReply,
-                        Payload:   msg.RequestSpecificData,
-                        ch:        c,
-                }
-
-                c.incomingRequests <- &req
-        default:
-                c.msg <- msg
-        }
-        return nil
-}
-
-func (m *mux) newChannel(chanType string, direction channelDirection, extraData []byte) *channel {
-        ch := &channel{
-                remoteWin:        window{Cond: newCond()},
-                myWindow:         channelWindowSize,
-                pending:          newBuffer(),
-                extPending:       newBuffer(),
-                direction:        direction,
-                incomingRequests: make(chan *Request, chanSize),
-                msg:              make(chan interface{}, chanSize),
-                chanType:         chanType,
-                extraData:        extraData,
-                mux:              m,
-                packetPool:       make(map[uint32][]byte),
-        }
-        ch.localId = m.chanList.add(ch)
-        return ch
-}
-
-var errUndecided = errors.New("ssh: must Accept or Reject channel")
-var errDecidedAlready = errors.New("ssh: can call Accept or Reject only once")
-
-type extChannel struct {
-        code uint32
-        ch   *channel
-}
-
-func (e *extChannel) Write(data []byte) (n int, err error) {
-        return e.ch.WriteExtended(data, e.code)
-}
-
-func (e *extChannel) Read(data []byte) (n int, err error) {
-        return e.ch.ReadExtended(data, e.code)
-}
-
-func (c *channel) Accept() (Channel, <-chan *Request, error) {
-        if c.decided {
-                return nil, nil, errDecidedAlready
-        }
-        c.maxIncomingPayload = channelMaxPacket
-        confirm := channelOpenConfirmMsg{
-                PeersId:       c.remoteId,
-                MyId:          c.localId,
-                MyWindow:      c.myWindow,
-                MaxPacketSize: c.maxIncomingPayload,
-        }
-        c.decided = true
-        if err := c.sendMessage(confirm); err != nil {
-                return nil, nil, err
-        }
-
-        return c, c.incomingRequests, nil
-}
-
-func (ch *channel) Reject(reason RejectionReason, message string) error {
-        if ch.decided {
-                return errDecidedAlready
-        }
-        reject := channelOpenFailureMsg{
-                PeersId:  ch.remoteId,
-                Reason:   reason,
-                Message:  message,
-                Language: "en",
-        }
-        ch.decided = true
-        return ch.sendMessage(reject)
-}
-
-func (ch *channel) Read(data []byte) (int, error) {
-        if !ch.decided {
-                return 0, errUndecided
-        }
-        return ch.ReadExtended(data, 0)
-}
-
-func (ch *channel) Write(data []byte) (int, error) {
-        if !ch.decided {
-                return 0, errUndecided
-        }
-        return ch.WriteExtended(data, 0)
-}
-
-func (ch *channel) CloseWrite() error {
-        if !ch.decided {
-                return errUndecided
-        }
-        ch.sentEOF = true
-        return ch.sendMessage(channelEOFMsg{
-                PeersId: ch.remoteId})
-}
-
-func (ch *channel) Close() error {
-        if !ch.decided {
-                return errUndecided
-        }
-
-        return ch.sendMessage(channelCloseMsg{
-                PeersId: ch.remoteId})
-}
-
-// Extended returns an io.ReadWriter that sends and receives data on the given,
-// SSH extended stream. Such streams are used, for example, for stderr.
-func (ch *channel) Extended(code uint32) io.ReadWriter {
-        if !ch.decided {
-                return nil
-        }
-        return &extChannel{code, ch}
-}
-
-func (ch *channel) Stderr() io.ReadWriter {
-        return ch.Extended(1)
-}
-
-func (ch *channel) SendRequest(name string, wantReply bool, payload []byte) (bool, error) {
-        if !ch.decided {
-                return false, errUndecided
-        }
-
-        if wantReply {
-                ch.sentRequestMu.Lock()
-                defer ch.sentRequestMu.Unlock()
-        }
-
-        msg := channelRequestMsg{
-                PeersId:             ch.remoteId,
-                Request:             name,
-                WantReply:           wantReply,
-                RequestSpecificData: payload,
-        }
-
-        if err := ch.sendMessage(msg); err != nil {
-                return false, err
-        }
-
-        if wantReply {
-                m, ok := (<-ch.msg)
-                if !ok {
-                        return false, io.EOF
-                }
-                switch m.(type) {
-                case *channelRequestFailureMsg:
-                        return false, nil
-                case *channelRequestSuccessMsg:
-                        return true, nil
-                default:
-                        return false, fmt.Errorf("ssh: unexpected response to channel request: %#v", m)
-                }
-        }
-
-        return false, nil
-}
-
-// ackRequest either sends an ack or nack to the channel request.
-func (ch *channel) ackRequest(ok bool) error {
-        if !ch.decided {
-                return errUndecided
-        }
-
-        var msg interface{}
-        if !ok {
-                msg = channelRequestFailureMsg{
-                        PeersId: ch.remoteId,
-                }
-        } else {
-                msg = channelRequestSuccessMsg{
-                        PeersId: ch.remoteId,
-                }
-        }
-        return ch.sendMessage(msg)
-}
-
-func (ch *channel) ChannelType() string {
-        return ch.chanType
-}
-
-func (ch *channel) ExtraData() []byte {
-        return ch.extraData
-}
diff --git a/vendor/golang.org/x/crypto/ssh/cipher.go b/vendor/golang.org/x/crypto/ssh/cipher.go
deleted file mode 100644
index 13484ab..0000000
--- a/vendor/golang.org/x/crypto/ssh/cipher.go
+++ /dev/null
@@ -1,627 +0,0 @@
-// 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 ssh
-
-import (
-        "crypto/aes"
-        "crypto/cipher"
-        "crypto/des"
-        "crypto/rc4"
-        "crypto/subtle"
-        "encoding/binary"
-        "errors"
-        "fmt"
-        "hash"
-        "io"
-        "io/ioutil"
-)
-
-const (
-        packetSizeMultiple = 16 // TODO(huin) this should be determined by the cipher.
-
-        // RFC 4253 section 6.1 defines a minimum packet size of 32768 that implementations
-        // MUST be able to process (plus a few more kilobytes for padding and mac). The RFC
-        // indicates implementations SHOULD be able to handle larger packet sizes, but then
-        // waffles on about reasonable limits.
-        //
-        // OpenSSH caps their maxPacket at 256kB so we choose to do
-        // the same. maxPacket is also used to ensure that uint32
-        // length fields do not overflow, so it should remain well
-        // below 4G.
-        maxPacket = 256 * 1024
-)
-
-// noneCipher implements cipher.Stream and provides no encryption. It is used
-// by the transport before the first key-exchange.
-type noneCipher struct{}
-
-func (c noneCipher) XORKeyStream(dst, src []byte) {
-        copy(dst, src)
-}
-
-func newAESCTR(key, iv []byte) (cipher.Stream, error) {
-        c, err := aes.NewCipher(key)
-        if err != nil {
-                return nil, err
-        }
-        return cipher.NewCTR(c, iv), nil
-}
-
-func newRC4(key, iv []byte) (cipher.Stream, error) {
-        return rc4.NewCipher(key)
-}
-
-type streamCipherMode struct {
-        keySize    int
-        ivSize     int
-        skip       int
-        createFunc func(key, iv []byte) (cipher.Stream, error)
-}
-
-func (c *streamCipherMode) createStream(key, iv []byte) (cipher.Stream, error) {
-        if len(key) < c.keySize {
-                panic("ssh: key length too small for cipher")
-        }
-        if len(iv) < c.ivSize {
-                panic("ssh: iv too small for cipher")
-        }
-
-        stream, err := c.createFunc(key[:c.keySize], iv[:c.ivSize])
-        if err != nil {
-                return nil, err
-        }
-
-        var streamDump []byte
-        if c.skip > 0 {
-                streamDump = make([]byte, 512)
-        }
-
-        for remainingToDump := c.skip; remainingToDump > 0; {
-                dumpThisTime := remainingToDump
-                if dumpThisTime > len(streamDump) {
-                        dumpThisTime = len(streamDump)
-                }
-                stream.XORKeyStream(streamDump[:dumpThisTime], streamDump[:dumpThisTime])
-                remainingToDump -= dumpThisTime
-        }
-
-        return stream, nil
-}
-
-// cipherModes documents properties of supported ciphers. Ciphers not included
-// are not supported and will not be negotiated, even if explicitly requested in
-// ClientConfig.Crypto.Ciphers.
-var cipherModes = map[string]*streamCipherMode{
-        // Ciphers from RFC4344, which introduced many CTR-based ciphers. Algorithms
-        // are defined in the order specified in the RFC.
-        "aes128-ctr": {16, aes.BlockSize, 0, newAESCTR},
-        "aes192-ctr": {24, aes.BlockSize, 0, newAESCTR},
-        "aes256-ctr": {32, aes.BlockSize, 0, newAESCTR},
-
-        // Ciphers from RFC4345, which introduces security-improved arcfour ciphers.
-        // They are defined in the order specified in the RFC.
-        "arcfour128": {16, 0, 1536, newRC4},
-        "arcfour256": {32, 0, 1536, newRC4},
-
-        // Cipher defined in RFC 4253, which describes SSH Transport Layer Protocol.
-        // Note that this cipher is not safe, as stated in RFC 4253: "Arcfour (and
-        // RC4) has problems with weak keys, and should be used with caution."
-        // RFC4345 introduces improved versions of Arcfour.
-        "arcfour": {16, 0, 0, newRC4},
-
-        // AES-GCM is not a stream cipher, so it is constructed with a
-        // special case. If we add any more non-stream ciphers, we
-        // should invest a cleaner way to do this.
-        gcmCipherID: {16, 12, 0, nil},
-
-        // CBC mode is insecure and so is not included in the default config.
-        // (See http://www.isg.rhul.ac.uk/~kp/SandPfinal.pdf). If absolutely
-        // needed, it's possible to specify a custom Config to enable it.
-        // You should expect that an active attacker can recover plaintext if
-        // you do.
-        aes128cbcID: {16, aes.BlockSize, 0, nil},
-
-        // 3des-cbc is insecure and is disabled by default.
-        tripledescbcID: {24, des.BlockSize, 0, nil},
-}
-
-// prefixLen is the length of the packet prefix that contains the packet length
-// and number of padding bytes.
-const prefixLen = 5
-
-// streamPacketCipher is a packetCipher using a stream cipher.
-type streamPacketCipher struct {
-        mac    hash.Hash
-        cipher cipher.Stream
-        etm    bool
-
-        // The following members are to avoid per-packet allocations.
-        prefix      [prefixLen]byte
-        seqNumBytes [4]byte
-        padding     [2 * packetSizeMultiple]byte
-        packetData  []byte
-        macResult   []byte
-}
-
-// readPacket reads and decrypt a single packet from the reader argument.
-func (s *streamPacketCipher) readPacket(seqNum uint32, r io.Reader) ([]byte, error) {
-        if _, err := io.ReadFull(r, s.prefix[:]); err != nil {
-                return nil, err
-        }
-
-        var encryptedPaddingLength [1]byte
-        if s.mac != nil && s.etm {
-                copy(encryptedPaddingLength[:], s.prefix[4:5])
-                s.cipher.XORKeyStream(s.prefix[4:5], s.prefix[4:5])
-        } else {
-                s.cipher.XORKeyStream(s.prefix[:], s.prefix[:])
-        }
-
-        length := binary.BigEndian.Uint32(s.prefix[0:4])
-        paddingLength := uint32(s.prefix[4])
-
-        var macSize uint32
-        if s.mac != nil {
-                s.mac.Reset()
-                binary.BigEndian.PutUint32(s.seqNumBytes[:], seqNum)
-                s.mac.Write(s.seqNumBytes[:])
-                if s.etm {
-                        s.mac.Write(s.prefix[:4])
-                        s.mac.Write(encryptedPaddingLength[:])
-                } else {
-                        s.mac.Write(s.prefix[:])
-                }
-                macSize = uint32(s.mac.Size())
-        }
-
-        if length <= paddingLength+1 {
-                return nil, errors.New("ssh: invalid packet length, packet too small")
-        }
-
-        if length > maxPacket {
-                return nil, errors.New("ssh: invalid packet length, packet too large")
-        }
-
-        // the maxPacket check above ensures that length-1+macSize
-        // does not overflow.
-        if uint32(cap(s.packetData)) < length-1+macSize {
-                s.packetData = make([]byte, length-1+macSize)
-        } else {
-                s.packetData = s.packetData[:length-1+macSize]
-        }
-
-        if _, err := io.ReadFull(r, s.packetData); err != nil {
-                return nil, err
-        }
-        mac := s.packetData[length-1:]
-        data := s.packetData[:length-1]
-
-        if s.mac != nil && s.etm {
-                s.mac.Write(data)
-        }
-
-        s.cipher.XORKeyStream(data, data)
-
-        if s.mac != nil {
-                if !s.etm {
-                        s.mac.Write(data)
-                }
-                s.macResult = s.mac.Sum(s.macResult[:0])
-                if subtle.ConstantTimeCompare(s.macResult, mac) != 1 {
-                        return nil, errors.New("ssh: MAC failure")
-                }
-        }
-
-        return s.packetData[:length-paddingLength-1], nil
-}
-
-// writePacket encrypts and sends a packet of data to the writer argument
-func (s *streamPacketCipher) writePacket(seqNum uint32, w io.Writer, rand io.Reader, packet []byte) error {
-        if len(packet) > maxPacket {
-                return errors.New("ssh: packet too large")
-        }
-
-        aadlen := 0
-        if s.mac != nil && s.etm {
-                // packet length is not encrypted for EtM modes
-                aadlen = 4
-        }
-
-        paddingLength := packetSizeMultiple - (prefixLen+len(packet)-aadlen)%packetSizeMultiple
-        if paddingLength < 4 {
-                paddingLength += packetSizeMultiple
-        }
-
-        length := len(packet) + 1 + paddingLength
-        binary.BigEndian.PutUint32(s.prefix[:], uint32(length))
-        s.prefix[4] = byte(paddingLength)
-        padding := s.padding[:paddingLength]
-        if _, err := io.ReadFull(rand, padding); err != nil {
-                return err
-        }
-
-        if s.mac != nil {
-                s.mac.Reset()
-                binary.BigEndian.PutUint32(s.seqNumBytes[:], seqNum)
-                s.mac.Write(s.seqNumBytes[:])
-
-                if s.etm {
-                        // For EtM algorithms, the packet length must stay unencrypted,
-                        // but the following data (padding length) must be encrypted
-                        s.cipher.XORKeyStream(s.prefix[4:5], s.prefix[4:5])
-                }
-
-                s.mac.Write(s.prefix[:])
-
-                if !s.etm {
-                        // For non-EtM algorithms, the algorithm is applied on unencrypted data
-                        s.mac.Write(packet)
-                        s.mac.Write(padding)
-                }
-        }
-
-        if !(s.mac != nil && s.etm) {
-                // For EtM algorithms, the padding length has already been encrypted
-                // and the packet length must remain unencrypted
-                s.cipher.XORKeyStream(s.prefix[:], s.prefix[:])
-        }
-
-        s.cipher.XORKeyStream(packet, packet)
-        s.cipher.XORKeyStream(padding, padding)
-
-        if s.mac != nil && s.etm {
-                // For EtM algorithms, packet and padding must be encrypted
-                s.mac.Write(packet)
-                s.mac.Write(padding)
-        }
-
-        if _, err := w.Write(s.prefix[:]); err != nil {
-                return err
-        }
-        if _, err := w.Write(packet); err != nil {
-                return err
-        }
-        if _, err := w.Write(padding); err != nil {
-                return err
-        }
-
-        if s.mac != nil {
-                s.macResult = s.mac.Sum(s.macResult[:0])
-                if _, err := w.Write(s.macResult); err != nil {
-                        return err
-                }
-        }
-
-        return nil
-}
-
-type gcmCipher struct {
-        aead   cipher.AEAD
-        prefix [4]byte
-        iv     []byte
-        buf    []byte
-}
-
-func newGCMCipher(iv, key, macKey []byte) (packetCipher, error) {
-        c, err := aes.NewCipher(key)
-        if err != nil {
-                return nil, err
-        }
-
-        aead, err := cipher.NewGCM(c)
-        if err != nil {
-                return nil, err
-        }
-
-        return &gcmCipher{
-                aead: aead,
-                iv:   iv,
-        }, nil
-}
-
-const gcmTagSize = 16
-
-func (c *gcmCipher) writePacket(seqNum uint32, w io.Writer, rand io.Reader, packet []byte) error {
-        // Pad out to multiple of 16 bytes. This is different from the
-        // stream cipher because that encrypts the length too.
-        padding := byte(packetSizeMultiple - (1+len(packet))%packetSizeMultiple)
-        if padding < 4 {
-                padding += packetSizeMultiple
-        }
-
-        length := uint32(len(packet) + int(padding) + 1)
-        binary.BigEndian.PutUint32(c.prefix[:], length)
-        if _, err := w.Write(c.prefix[:]); err != nil {
-                return err
-        }
-
-        if cap(c.buf) < int(length) {
-                c.buf = make([]byte, length)
-        } else {
-                c.buf = c.buf[:length]
-        }
-
-        c.buf[0] = padding
-        copy(c.buf[1:], packet)
-        if _, err := io.ReadFull(rand, c.buf[1+len(packet):]); err != nil {
-                return err
-        }
-        c.buf = c.aead.Seal(c.buf[:0], c.iv, c.buf, c.prefix[:])
-        if _, err := w.Write(c.buf); err != nil {
-                return err
-        }
-        c.incIV()
-
-        return nil
-}
-
-func (c *gcmCipher) incIV() {
-        for i := 4 + 7; i >= 4; i-- {
-                c.iv[i]++
-                if c.iv[i] != 0 {
-                        break
-                }
-        }
-}
-
-func (c *gcmCipher) readPacket(seqNum uint32, r io.Reader) ([]byte, error) {
-        if _, err := io.ReadFull(r, c.prefix[:]); err != nil {
-                return nil, err
-        }
-        length := binary.BigEndian.Uint32(c.prefix[:])
-        if length > maxPacket {
-                return nil, errors.New("ssh: max packet length exceeded.")
-        }
-
-        if cap(c.buf) < int(length+gcmTagSize) {
-                c.buf = make([]byte, length+gcmTagSize)
-        } else {
-                c.buf = c.buf[:length+gcmTagSize]
-        }
-
-        if _, err := io.ReadFull(r, c.buf); err != nil {
-                return nil, err
-        }
-
-        plain, err := c.aead.Open(c.buf[:0], c.iv, c.buf, c.prefix[:])
-        if err != nil {
-                return nil, err
-        }
-        c.incIV()
-
-        padding := plain[0]
-        if padding < 4 || padding >= 20 {
-                return nil, fmt.Errorf("ssh: illegal padding %d", padding)
-        }
-
-        if int(padding+1) >= len(plain) {
-                return nil, fmt.Errorf("ssh: padding %d too large", padding)
-        }
-        plain = plain[1 : length-uint32(padding)]
-        return plain, nil
-}
-
-// cbcCipher implements aes128-cbc cipher defined in RFC 4253 section 6.1
-type cbcCipher struct {
-        mac       hash.Hash
-        macSize   uint32
-        decrypter cipher.BlockMode
-        encrypter cipher.BlockMode
-
-        // The following members are to avoid per-packet allocations.
-        seqNumBytes [4]byte
-        packetData  []byte
-        macResult   []byte
-
-        // Amount of data we should still read to hide which
-        // verification error triggered.
-        oracleCamouflage uint32
-}
-
-func newCBCCipher(c cipher.Block, iv, key, macKey []byte, algs directionAlgorithms) (packetCipher, error) {
-        cbc := &cbcCipher{
-                mac:        macModes[algs.MAC].new(macKey),
-                decrypter:  cipher.NewCBCDecrypter(c, iv),
-                encrypter:  cipher.NewCBCEncrypter(c, iv),
-                packetData: make([]byte, 1024),
-        }
-        if cbc.mac != nil {
-                cbc.macSize = uint32(cbc.mac.Size())
-        }
-
-        return cbc, nil
-}
-
-func newAESCBCCipher(iv, key, macKey []byte, algs directionAlgorithms) (packetCipher, error) {
-        c, err := aes.NewCipher(key)
-        if err != nil {
-                return nil, err
-        }
-
-        cbc, err := newCBCCipher(c, iv, key, macKey, algs)
-        if err != nil {
-                return nil, err
-        }
-
-        return cbc, nil
-}
-
-func newTripleDESCBCCipher(iv, key, macKey []byte, algs directionAlgorithms) (packetCipher, error) {
-        c, err := des.NewTripleDESCipher(key)
-        if err != nil {
-                return nil, err
-        }
-
-        cbc, err := newCBCCipher(c, iv, key, macKey, algs)
-        if err != nil {
-                return nil, err
-        }
-
-        return cbc, nil
-}
-
-func maxUInt32(a, b int) uint32 {
-        if a > b {
-                return uint32(a)
-        }
-        return uint32(b)
-}
-
-const (
-        cbcMinPacketSizeMultiple = 8
-        cbcMinPacketSize         = 16
-        cbcMinPaddingSize        = 4
-)
-
-// cbcError represents a verification error that may leak information.
-type cbcError string
-
-func (e cbcError) Error() string { return string(e) }
-
-func (c *cbcCipher) readPacket(seqNum uint32, r io.Reader) ([]byte, error) {
-        p, err := c.readPacketLeaky(seqNum, r)
-        if err != nil {
-                if _, ok := err.(cbcError); ok {
-                        // Verification error: read a fixed amount of
-                        // data, to make distinguishing between
-                        // failing MAC and failing length check more
-                        // difficult.
-                        io.CopyN(ioutil.Discard, r, int64(c.oracleCamouflage))
-                }
-        }
-        return p, err
-}
-
-func (c *cbcCipher) readPacketLeaky(seqNum uint32, r io.Reader) ([]byte, error) {
-        blockSize := c.decrypter.BlockSize()
-
-        // Read the header, which will include some of the subsequent data in the
-        // case of block ciphers - this is copied back to the payload later.
-        // How many bytes of payload/padding will be read with this first read.
-        firstBlockLength := uint32((prefixLen + blockSize - 1) / blockSize * blockSize)
-        firstBlock := c.packetData[:firstBlockLength]
-        if _, err := io.ReadFull(r, firstBlock); err != nil {
-                return nil, err
-        }
-
-        c.oracleCamouflage = maxPacket + 4 + c.macSize - firstBlockLength
-
-        c.decrypter.CryptBlocks(firstBlock, firstBlock)
-        length := binary.BigEndian.Uint32(firstBlock[:4])
-        if length > maxPacket {
-                return nil, cbcError("ssh: packet too large")
-        }
-        if length+4 < maxUInt32(cbcMinPacketSize, blockSize) {
-                // The minimum size of a packet is 16 (or the cipher block size, whichever
-                // is larger) bytes.
-                return nil, cbcError("ssh: packet too small")
-        }
-        // The length of the packet (including the length field but not the MAC) must
-        // be a multiple of the block size or 8, whichever is larger.
-        if (length+4)%maxUInt32(cbcMinPacketSizeMultiple, blockSize) != 0 {
-                return nil, cbcError("ssh: invalid packet length multiple")
-        }
-
-        paddingLength := uint32(firstBlock[4])
-        if paddingLength < cbcMinPaddingSize || length <= paddingLength+1 {
-                return nil, cbcError("ssh: invalid packet length")
-        }
-
-        // Positions within the c.packetData buffer:
-        macStart := 4 + length
-        paddingStart := macStart - paddingLength
-
-        // Entire packet size, starting before length, ending at end of mac.
-        entirePacketSize := macStart + c.macSize
-
-        // Ensure c.packetData is large enough for the entire packet data.
-        if uint32(cap(c.packetData)) < entirePacketSize {
-                // Still need to upsize and copy, but this should be rare at runtime, only
-                // on upsizing the packetData buffer.
-                c.packetData = make([]byte, entirePacketSize)
-                copy(c.packetData, firstBlock)
-        } else {
-                c.packetData = c.packetData[:entirePacketSize]
-        }
-
-        if n, err := io.ReadFull(r, c.packetData[firstBlockLength:]); err != nil {
-                return nil, err
-        } else {
-                c.oracleCamouflage -= uint32(n)
-        }
-
-        remainingCrypted := c.packetData[firstBlockLength:macStart]
-        c.decrypter.CryptBlocks(remainingCrypted, remainingCrypted)
-
-        mac := c.packetData[macStart:]
-        if c.mac != nil {
-                c.mac.Reset()
-                binary.BigEndian.PutUint32(c.seqNumBytes[:], seqNum)
-                c.mac.Write(c.seqNumBytes[:])
-                c.mac.Write(c.packetData[:macStart])
-                c.macResult = c.mac.Sum(c.macResult[:0])
-                if subtle.ConstantTimeCompare(c.macResult, mac) != 1 {
-                        return nil, cbcError("ssh: MAC failure")
-                }
-        }
-
-        return c.packetData[prefixLen:paddingStart], nil
-}
-
-func (c *cbcCipher) writePacket(seqNum uint32, w io.Writer, rand io.Reader, packet []byte) error {
-        effectiveBlockSize := maxUInt32(cbcMinPacketSizeMultiple, c.encrypter.BlockSize())
-
-        // Length of encrypted portion of the packet (header, payload, padding).
-        // Enforce minimum padding and packet size.
-        encLength := maxUInt32(prefixLen+len(packet)+cbcMinPaddingSize, cbcMinPaddingSize)
-        // Enforce block size.
-        encLength = (encLength + effectiveBlockSize - 1) / effectiveBlockSize * effectiveBlockSize
-
-        length := encLength - 4
-        paddingLength := int(length) - (1 + len(packet))
-
-        // Overall buffer contains: header, payload, padding, mac.
-        // Space for the MAC is reserved in the capacity but not the slice length.
-        bufferSize := encLength + c.macSize
-        if uint32(cap(c.packetData)) < bufferSize {
-                c.packetData = make([]byte, encLength, bufferSize)
-        } else {
-                c.packetData = c.packetData[:encLength]
-        }
-
-        p := c.packetData
-
-        // Packet header.
-        binary.BigEndian.PutUint32(p, length)
-        p = p[4:]
-        p[0] = byte(paddingLength)
-
-        // Payload.
-        p = p[1:]
-        copy(p, packet)
-
-        // Padding.
-        p = p[len(packet):]
-        if _, err := io.ReadFull(rand, p); err != nil {
-                return err
-        }
-
-        if c.mac != nil {
-                c.mac.Reset()
-                binary.BigEndian.PutUint32(c.seqNumBytes[:], seqNum)
-                c.mac.Write(c.seqNumBytes[:])
-                c.mac.Write(c.packetData)
-                // The MAC is now appended into the capacity reserved for it earlier.
-                c.packetData = c.mac.Sum(c.packetData)
-        }
-
-        c.encrypter.CryptBlocks(c.packetData[:encLength], c.packetData[:encLength])
-
-        if _, err := w.Write(c.packetData); err != nil {
-                return err
-        }
-
-        return nil
-}
diff --git a/vendor/golang.org/x/crypto/ssh/client.go b/vendor/golang.org/x/crypto/ssh/client.go
deleted file mode 100644
index c97f297..0000000
--- a/vendor/golang.org/x/crypto/ssh/client.go
+++ /dev/null
@@ -1,211 +0,0 @@
-// 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 ssh
-
-import (
-        "errors"
-        "fmt"
-        "net"
-        "sync"
-        "time"
-)
-
-// Client implements a traditional SSH client that supports shells,
-// subprocesses, port forwarding and tunneled dialing.
-type Client struct {
-        Conn
-
-        forwards        forwardList // forwarded tcpip connections from the remote side
-        mu              sync.Mutex
-        channelHandlers map[string]chan NewChannel
-}
-
-// HandleChannelOpen returns a channel on which NewChannel requests
-// for the given type are sent. If the type already is being handled,
-// nil is returned. The channel is closed when the connection is closed.
-func (c *Client) HandleChannelOpen(channelType string) <-chan NewChannel {
-        c.mu.Lock()
-        defer c.mu.Unlock()
-        if c.channelHandlers == nil {
-                // The SSH channel has been closed.
-                c := make(chan NewChannel)
-                close(c)
-                return c
-        }
-
-        ch := c.channelHandlers[channelType]
-        if ch != nil {
-                return nil
-        }
-
-        ch = make(chan NewChannel, chanSize)
-        c.channelHandlers[channelType] = ch
-        return ch
-}
-
-// NewClient creates a Client on top of the given connection.
-func NewClient(c Conn, chans <-chan NewChannel, reqs <-chan *Request) *Client {
-        conn := &Client{
-                Conn:            c,
-                channelHandlers: make(map[string]chan NewChannel, 1),
-        }
-
-        go conn.handleGlobalRequests(reqs)
-        go conn.handleChannelOpens(chans)
-        go func() {
-                conn.Wait()
-                conn.forwards.closeAll()
-        }()
-        go conn.forwards.handleChannels(conn.HandleChannelOpen("forwarded-tcpip"))
-        return conn
-}
-
-// NewClientConn establishes an authenticated SSH connection using c
-// as the underlying transport.  The Request and NewChannel channels
-// must be serviced or the connection will hang.
-func NewClientConn(c net.Conn, addr string, config *ClientConfig) (Conn, <-chan NewChannel, <-chan *Request, error) {
-        fullConf := *config
-        fullConf.SetDefaults()
-        conn := &connection{
-                sshConn: sshConn{conn: c},
-        }
-
-        if err := conn.clientHandshake(addr, &fullConf); err != nil {
-                c.Close()
-                return nil, nil, nil, fmt.Errorf("ssh: handshake failed: %v", err)
-        }
-        conn.mux = newMux(conn.transport)
-        return conn, conn.mux.incomingChannels, conn.mux.incomingRequests, nil
-}
-
-// clientHandshake performs the client side key exchange. See RFC 4253 Section
-// 7.
-func (c *connection) clientHandshake(dialAddress string, config *ClientConfig) error {
-        if config.ClientVersion != "" {
-                c.clientVersion = []byte(config.ClientVersion)
-        } else {
-                c.clientVersion = []byte(packageVersion)
-        }
-        var err error
-        c.serverVersion, err = exchangeVersions(c.sshConn.conn, c.clientVersion)
-        if err != nil {
-                return err
-        }
-
-        c.transport = newClientTransport(
-                newTransport(c.sshConn.conn, config.Rand, true /* is client */),
-                c.clientVersion, c.serverVersion, config, dialAddress, c.sshConn.RemoteAddr())
-        if err := c.transport.waitSession(); err != nil {
-                return err
-        }
-
-        c.sessionID = c.transport.getSessionID()
-        return c.clientAuthenticate(config)
-}
-
-// verifyHostKeySignature verifies the host key obtained in the key
-// exchange.
-func verifyHostKeySignature(hostKey PublicKey, result *kexResult) error {
-        sig, rest, ok := parseSignatureBody(result.Signature)
-        if len(rest) > 0 || !ok {
-                return errors.New("ssh: signature parse error")
-        }
-
-        return hostKey.Verify(result.H, sig)
-}
-
-// NewSession opens a new Session for this client. (A session is a remote
-// execution of a program.)
-func (c *Client) NewSession() (*Session, error) {
-        ch, in, err := c.OpenChannel("session", nil)
-        if err != nil {
-                return nil, err
-        }
-        return newSession(ch, in)
-}
-
-func (c *Client) handleGlobalRequests(incoming <-chan *Request) {
-        for r := range incoming {
-                // This handles keepalive messages and matches
-                // the behaviour of OpenSSH.
-                r.Reply(false, nil)
-        }
-}
-
-// handleChannelOpens channel open messages from the remote side.
-func (c *Client) handleChannelOpens(in <-chan NewChannel) {
-        for ch := range in {
-                c.mu.Lock()
-                handler := c.channelHandlers[ch.ChannelType()]
-                c.mu.Unlock()
-
-                if handler != nil {
-                        handler <- ch
-                } else {
-                        ch.Reject(UnknownChannelType, fmt.Sprintf("unknown channel type: %v", ch.ChannelType()))
-                }
-        }
-
-        c.mu.Lock()
-        for _, ch := range c.channelHandlers {
-                close(ch)
-        }
-        c.channelHandlers = nil
-        c.mu.Unlock()
-}
-
-// Dial starts a client connection to the given SSH server. It is a
-// convenience function that connects to the given network address,
-// initiates the SSH handshake, and then sets up a Client.  For access
-// to incoming channels and requests, use net.Dial with NewClientConn
-// instead.
-func Dial(network, addr string, config *ClientConfig) (*Client, error) {
-        conn, err := net.DialTimeout(network, addr, config.Timeout)
-        if err != nil {
-                return nil, err
-        }
-        c, chans, reqs, err := NewClientConn(conn, addr, config)
-        if err != nil {
-                return nil, err
-        }
-        return NewClient(c, chans, reqs), nil
-}
-
-// A ClientConfig structure is used to configure a Client. It must not be
-// modified after having been passed to an SSH function.
-type ClientConfig struct {
-        // Config contains configuration that is shared between clients and
-        // servers.
-        Config
-
-        // User contains the username to authenticate as.
-        User string
-
-        // Auth contains possible authentication methods to use with the
-        // server. Only the first instance of a particular RFC 4252 method will
-        // be used during authentication.
-        Auth []AuthMethod
-
-        // HostKeyCallback, if not nil, is called during the cryptographic
-        // handshake to validate the server's host key. A nil HostKeyCallback
-        // implies that all host keys are accepted.
-        HostKeyCallback func(hostname string, remote net.Addr, key PublicKey) error
-
-        // ClientVersion contains the version identification string that will
-        // be used for the connection. If empty, a reasonable default is used.
-        ClientVersion string
-
-        // HostKeyAlgorithms lists the key types that the client will
-        // accept from the server as host key, in order of
-        // preference. If empty, a reasonable default is used. Any
-        // string returned from PublicKey.Type method may be used, or
-        // any of the CertAlgoXxxx and KeyAlgoXxxx constants.
-        HostKeyAlgorithms []string
-
-        // Timeout is the maximum amount of time for the TCP connection to establish.
-        //
-        // A Timeout of zero means no timeout.
-        Timeout time.Duration
-}
diff --git a/vendor/golang.org/x/crypto/ssh/client_auth.go b/vendor/golang.org/x/crypto/ssh/client_auth.go
deleted file mode 100644
index fd1ec5d..0000000
--- a/vendor/golang.org/x/crypto/ssh/client_auth.go
+++ /dev/null
@@ -1,475 +0,0 @@
-// 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 ssh
-
-import (
-        "bytes"
-        "errors"
-        "fmt"
-        "io"
-)
-
-// clientAuthenticate authenticates with the remote server. See RFC 4252.
-func (c *connection) clientAuthenticate(config *ClientConfig) error {
-        // initiate user auth session
-        if err := c.transport.writePacket(Marshal(&serviceRequestMsg{serviceUserAuth})); err != nil {
-                return err
-        }
-        packet, err := c.transport.readPacket()
-        if err != nil {
-                return err
-        }
-        var serviceAccept serviceAcceptMsg
-        if err := Unmarshal(packet, &serviceAccept); err != nil {
-                return err
-        }
-
-        // during the authentication phase the client first attempts the "none" method
-        // then any untried methods suggested by the server.
-        tried := make(map[string]bool)
-        var lastMethods []string
-
-        sessionID := c.transport.getSessionID()
-        for auth := AuthMethod(new(noneAuth)); auth != nil; {
-                ok, methods, err := auth.auth(sessionID, config.User, c.transport, config.Rand)
-                if err != nil {
-                        return err
-                }
-                if ok {
-                        // success
-                        return nil
-                }
-                tried[auth.method()] = true
-                if methods == nil {
-                        methods = lastMethods
-                }
-                lastMethods = methods
-
-                auth = nil
-
-        findNext:
-                for _, a := range config.Auth {
-                        candidateMethod := a.method()
-                        if tried[candidateMethod] {
-                                continue
-                        }
-                        for _, meth := range methods {
-                                if meth == candidateMethod {
-                                        auth = a
-                                        break findNext
-                                }
-                        }
-                }
-        }
-        return fmt.Errorf("ssh: unable to authenticate, attempted methods %v, no supported methods remain", keys(tried))
-}
-
-func keys(m map[string]bool) []string {
-        s := make([]string, 0, len(m))
-
-        for key := range m {
-                s = append(s, key)
-        }
-        return s
-}
-
-// An AuthMethod represents an instance of an RFC 4252 authentication method.
-type AuthMethod interface {
-        // auth authenticates user over transport t.
-        // Returns true if authentication is successful.
-        // If authentication is not successful, a []string of alternative
-        // method names is returned. If the slice is nil, it will be ignored
-        // and the previous set of possible methods will be reused.
-        auth(session []byte, user string, p packetConn, rand io.Reader) (bool, []string, error)
-
-        // method returns the RFC 4252 method name.
-        method() string
-}
-
-// "none" authentication, RFC 4252 section 5.2.
-type noneAuth int
-
-func (n *noneAuth) auth(session []byte, user string, c packetConn, rand io.Reader) (bool, []string, error) {
-        if err := c.writePacket(Marshal(&userAuthRequestMsg{
-                User:    user,
-                Service: serviceSSH,
-                Method:  "none",
-        })); err != nil {
-                return false, nil, err
-        }
-
-        return handleAuthResponse(c)
-}
-
-func (n *noneAuth) method() string {
-        return "none"
-}
-
-// passwordCallback is an AuthMethod that fetches the password through
-// a function call, e.g. by prompting the user.
-type passwordCallback func() (password string, err error)
-
-func (cb passwordCallback) auth(session []byte, user string, c packetConn, rand io.Reader) (bool, []string, error) {
-        type passwordAuthMsg struct {
-                User     string `sshtype:"50"`
-                Service  string
-                Method   string
-                Reply    bool
-                Password string
-        }
-
-        pw, err := cb()
-        // REVIEW NOTE: is there a need to support skipping a password attempt?
-        // The program may only find out that the user doesn't have a password
-        // when prompting.
-        if err != nil {
-                return false, nil, err
-        }
-
-        if err := c.writePacket(Marshal(&passwordAuthMsg{
-                User:     user,
-                Service:  serviceSSH,
-                Method:   cb.method(),
-                Reply:    false,
-                Password: pw,
-        })); err != nil {
-                return false, nil, err
-        }
-
-        return handleAuthResponse(c)
-}
-
-func (cb passwordCallback) method() string {
-        return "password"
-}
-
-// Password returns an AuthMethod using the given password.
-func Password(secret string) AuthMethod {
-        return passwordCallback(func() (string, error) { return secret, nil })
-}
-
-// PasswordCallback returns an AuthMethod that uses a callback for
-// fetching a password.
-func PasswordCallback(prompt func() (secret string, err error)) AuthMethod {
-        return passwordCallback(prompt)
-}
-
-type publickeyAuthMsg struct {
-        User    string `sshtype:"50"`
-        Service string
-        Method  string
-        // HasSig indicates to the receiver packet that the auth request is signed and
-        // should be used for authentication of the request.
-        HasSig   bool
-        Algoname string
-        PubKey   []byte
-        // Sig is tagged with "rest" so Marshal will exclude it during
-        // validateKey
-        Sig []byte `ssh:"rest"`
-}
-
-// publicKeyCallback is an AuthMethod that uses a set of key
-// pairs for authentication.
-type publicKeyCallback func() ([]Signer, error)
-
-func (cb publicKeyCallback) method() string {
-        return "publickey"
-}
-
-func (cb publicKeyCallback) auth(session []byte, user string, c packetConn, rand io.Reader) (bool, []string, error) {
-        // Authentication is performed in two stages. The first stage sends an
-        // enquiry to test if each key is acceptable to the remote. The second
-        // stage attempts to authenticate with the valid keys obtained in the
-        // first stage.
-
-        signers, err := cb()
-        if err != nil {
-                return false, nil, err
-        }
-        var validKeys []Signer
-        for _, signer := range signers {
-                if ok, err := validateKey(signer.PublicKey(), user, c); ok {
-                        validKeys = append(validKeys, signer)
-                } else {
-                        if err != nil {
-                                return false, nil, err
-                        }
-                }
-        }
-
-        // methods that may continue if this auth is not successful.
-        var methods []string
-        for _, signer := range validKeys {
-                pub := signer.PublicKey()
-
-                pubKey := pub.Marshal()
-                sign, err := signer.Sign(rand, buildDataSignedForAuth(session, userAuthRequestMsg{
-                        User:    user,
-                        Service: serviceSSH,
-                        Method:  cb.method(),
-                }, []byte(pub.Type()), pubKey))
-                if err != nil {
-                        return false, nil, err
-                }
-
-                // manually wrap the serialized signature in a string
-                s := Marshal(sign)
-                sig := make([]byte, stringLength(len(s)))
-                marshalString(sig, s)
-                msg := publickeyAuthMsg{
-                        User:     user,
-                        Service:  serviceSSH,
-                        Method:   cb.method(),
-                        HasSig:   true,
-                        Algoname: pub.Type(),
-                        PubKey:   pubKey,
-                        Sig:      sig,
-                }
-                p := Marshal(&msg)
-                if err := c.writePacket(p); err != nil {
-                        return false, nil, err
-                }
-                var success bool
-                success, methods, err = handleAuthResponse(c)
-                if err != nil {
-                        return false, nil, err
-                }
-                if success {
-                        return success, methods, err
-                }
-        }
-        return false, methods, nil
-}
-
-// validateKey validates the key provided is acceptable to the server.
-func validateKey(key PublicKey, user string, c packetConn) (bool, error) {
-        pubKey := key.Marshal()
-        msg := publickeyAuthMsg{
-                User:     user,
-                Service:  serviceSSH,
-                Method:   "publickey",
-                HasSig:   false,
-                Algoname: key.Type(),
-                PubKey:   pubKey,
-        }
-        if err := c.writePacket(Marshal(&msg)); err != nil {
-                return false, err
-        }
-
-        return confirmKeyAck(key, c)
-}
-
-func confirmKeyAck(key PublicKey, c packetConn) (bool, error) {
-        pubKey := key.Marshal()
-        algoname := key.Type()
-
-        for {
-                packet, err := c.readPacket()
-                if err != nil {
-                        return false, err
-                }
-                switch packet[0] {
-                case msgUserAuthBanner:
-                        // TODO(gpaul): add callback to present the banner to the user
-                case msgUserAuthPubKeyOk:
-                        var msg userAuthPubKeyOkMsg
-                        if err := Unmarshal(packet, &msg); err != nil {
-                                return false, err
-                        }
-                        if msg.Algo != algoname || !bytes.Equal(msg.PubKey, pubKey) {
-                                return false, nil
-                        }
-                        return true, nil
-                case msgUserAuthFailure:
-                        return false, nil
-                default:
-                        return false, unexpectedMessageError(msgUserAuthSuccess, packet[0])
-                }
-        }
-}
-
-// PublicKeys returns an AuthMethod that uses the given key
-// pairs.
-func PublicKeys(signers ...Signer) AuthMethod {
-        return publicKeyCallback(func() ([]Signer, error) { return signers, nil })
-}
-
-// PublicKeysCallback returns an AuthMethod that runs the given
-// function to obtain a list of key pairs.
-func PublicKeysCallback(getSigners func() (signers []Signer, err error)) AuthMethod {
-        return publicKeyCallback(getSigners)
-}
-
-// handleAuthResponse returns whether the preceding authentication request succeeded
-// along with a list of remaining authentication methods to try next and
-// an error if an unexpected response was received.
-func handleAuthResponse(c packetConn) (bool, []string, error) {
-        for {
-                packet, err := c.readPacket()
-                if err != nil {
-                        return false, nil, err
-                }
-
-                switch packet[0] {
-                case msgUserAuthBanner:
-                        // TODO: add callback to present the banner to the user
-                case msgUserAuthFailure:
-                        var msg userAuthFailureMsg
-                        if err := Unmarshal(packet, &msg); err != nil {
-                                return false, nil, err
-                        }
-                        return false, msg.Methods, nil
-                case msgUserAuthSuccess:
-                        return true, nil, nil
-                default:
-                        return false, nil, unexpectedMessageError(msgUserAuthSuccess, packet[0])
-                }
-        }
-}
-
-// KeyboardInteractiveChallenge should print questions, optionally
-// disabling echoing (e.g. for passwords), and return all the answers.
-// Challenge may be called multiple times in a single session. After
-// successful authentication, the server may send a challenge with no
-// questions, for which the user and instruction messages should be
-// printed.  RFC 4256 section 3.3 details how the UI should behave for
-// both CLI and GUI environments.
-type KeyboardInteractiveChallenge func(user, instruction string, questions []string, echos []bool) (answers []string, err error)
-
-// KeyboardInteractive returns a AuthMethod using a prompt/response
-// sequence controlled by the server.
-func KeyboardInteractive(challenge KeyboardInteractiveChallenge) AuthMethod {
-        return challenge
-}
-
-func (cb KeyboardInteractiveChallenge) method() string {
-        return "keyboard-interactive"
-}
-
-func (cb KeyboardInteractiveChallenge) auth(session []byte, user string, c packetConn, rand io.Reader) (bool, []string, error) {
-        type initiateMsg struct {
-                User       string `sshtype:"50"`
-                Service    string
-                Method     string
-                Language   string
-                Submethods string
-        }
-
-        if err := c.writePacket(Marshal(&initiateMsg{
-                User:    user,
-                Service: serviceSSH,
-                Method:  "keyboard-interactive",
-        })); err != nil {
-                return false, nil, err
-        }
-
-        for {
-                packet, err := c.readPacket()
-                if err != nil {
-                        return false, nil, err
-                }
-
-                // like handleAuthResponse, but with less options.
-                switch packet[0] {
-                case msgUserAuthBanner:
-                        // TODO: Print banners during userauth.
-                        continue
-                case msgUserAuthInfoRequest:
-                        // OK
-                case msgUserAuthFailure:
-                        var msg userAuthFailureMsg
-                        if err := Unmarshal(packet, &msg); err != nil {
-                                return false, nil, err
-                        }
-                        return false, msg.Methods, nil
-                case msgUserAuthSuccess:
-                        return true, nil, nil
-                default:
-                        return false, nil, unexpectedMessageError(msgUserAuthInfoRequest, packet[0])
-                }
-
-                var msg userAuthInfoRequestMsg
-                if err := Unmarshal(packet, &msg); err != nil {
-                        return false, nil, err
-                }
-
-                // Manually unpack the prompt/echo pairs.
-                rest := msg.Prompts
-                var prompts []string
-                var echos []bool
-                for i := 0; i < int(msg.NumPrompts); i++ {
-                        prompt, r, ok := parseString(rest)
-                        if !ok || len(r) == 0 {
-                                return false, nil, errors.New("ssh: prompt format error")
-                        }
-                        prompts = append(prompts, string(prompt))
-                        echos = append(echos, r[0] != 0)
-                        rest = r[1:]
-                }
-
-                if len(rest) != 0 {
-                        return false, nil, errors.New("ssh: extra data following keyboard-interactive pairs")
-                }
-
-                answers, err := cb(msg.User, msg.Instruction, prompts, echos)
-                if err != nil {
-                        return false, nil, err
-                }
-
-                if len(answers) != len(prompts) {
-                        return false, nil, errors.New("ssh: not enough answers from keyboard-interactive callback")
-                }
-                responseLength := 1 + 4
-                for _, a := range answers {
-                        responseLength += stringLength(len(a))
-                }
-                serialized := make([]byte, responseLength)
-                p := serialized
-                p[0] = msgUserAuthInfoResponse
-                p = p[1:]
-                p = marshalUint32(p, uint32(len(answers)))
-                for _, a := range answers {
-                        p = marshalString(p, []byte(a))
-                }
-
-                if err := c.writePacket(serialized); err != nil {
-                        return false, nil, err
-                }
-        }
-}
-
-type retryableAuthMethod struct {
-        authMethod AuthMethod
-        maxTries   int
-}
-
-func (r *retryableAuthMethod) auth(session []byte, user string, c packetConn, rand io.Reader) (ok bool, methods []string, err error) {
-        for i := 0; r.maxTries <= 0 || i < r.maxTries; i++ {
-                ok, methods, err = r.authMethod.auth(session, user, c, rand)
-                if ok || err != nil { // either success or error terminate
-                        return ok, methods, err
-                }
-        }
-        return ok, methods, err
-}
-
-func (r *retryableAuthMethod) method() string {
-        return r.authMethod.method()
-}
-
-// RetryableAuthMethod is a decorator for other auth methods enabling them to
-// be retried up to maxTries before considering that AuthMethod itself failed.
-// If maxTries is <= 0, will retry indefinitely
-//
-// This is useful for interactive clients using challenge/response type
-// authentication (e.g. Keyboard-Interactive, Password, etc) where the user
-// could mistype their response resulting in the server issuing a
-// SSH_MSG_USERAUTH_FAILURE (rfc4252 #8 [password] and rfc4256 #3.4
-// [keyboard-interactive]); Without this decorator, the non-retryable
-// AuthMethod would be removed from future consideration, and never tried again
-// (and so the user would never be able to retry their entry).
-func RetryableAuthMethod(auth AuthMethod, maxTries int) AuthMethod {
-        return &retryableAuthMethod{authMethod: auth, maxTries: maxTries}
-}
diff --git a/vendor/golang.org/x/crypto/ssh/common.go b/vendor/golang.org/x/crypto/ssh/common.go
deleted file mode 100644
index 8656d0f..0000000
--- a/vendor/golang.org/x/crypto/ssh/common.go
+++ /dev/null
@@ -1,371 +0,0 @@
-// 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 ssh
-
-import (
-        "crypto"
-        "crypto/rand"
-        "fmt"
-        "io"
-        "sync"
-
-        _ "crypto/sha1"
-        _ "crypto/sha256"
-        _ "crypto/sha512"
-)
-
-// These are string constants in the SSH protocol.
-const (
-        compressionNone = "none"
-        serviceUserAuth = "ssh-userauth"
-        serviceSSH      = "ssh-connection"
-)
-
-// supportedCiphers specifies the supported ciphers in preference order.
-var supportedCiphers = []string{
-        "aes128-ctr", "aes192-ctr", "aes256-ctr",
-        "aes128-gcm@openssh.com",
-        "arcfour256", "arcfour128",
-}
-
-// supportedKexAlgos specifies the supported key-exchange algorithms in
-// preference order.
-var supportedKexAlgos = []string{
-        kexAlgoCurve25519SHA256,
-        // P384 and P521 are not constant-time yet, but since we don't
-        // reuse ephemeral keys, using them for ECDH should be OK.
-        kexAlgoECDH256, kexAlgoECDH384, kexAlgoECDH521,
-        kexAlgoDH14SHA1, kexAlgoDH1SHA1,
-}
-
-// supportedKexAlgos specifies the supported host-key algorithms (i.e. methods
-// of authenticating servers) in preference order.
-var supportedHostKeyAlgos = []string{
-        CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01,
-        CertAlgoECDSA384v01, CertAlgoECDSA521v01, CertAlgoED25519v01,
-
-        KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521,
-        KeyAlgoRSA, KeyAlgoDSA,
-
-        KeyAlgoED25519,
-}
-
-// supportedMACs specifies a default set of MAC algorithms in preference order.
-// This is based on RFC 4253, section 6.4, but with hmac-md5 variants removed
-// because they have reached the end of their useful life.
-var supportedMACs = []string{
-        "hmac-sha2-256-etm@openssh.com", "hmac-sha2-256", "hmac-sha1", "hmac-sha1-96",
-}
-
-var supportedCompressions = []string{compressionNone}
-
-// hashFuncs keeps the mapping of supported algorithms to their respective
-// hashes needed for signature verification.
-var hashFuncs = map[string]crypto.Hash{
-        KeyAlgoRSA:          crypto.SHA1,
-        KeyAlgoDSA:          crypto.SHA1,
-        KeyAlgoECDSA256:     crypto.SHA256,
-        KeyAlgoECDSA384:     crypto.SHA384,
-        KeyAlgoECDSA521:     crypto.SHA512,
-        CertAlgoRSAv01:      crypto.SHA1,
-        CertAlgoDSAv01:      crypto.SHA1,
-        CertAlgoECDSA256v01: crypto.SHA256,
-        CertAlgoECDSA384v01: crypto.SHA384,
-        CertAlgoECDSA521v01: crypto.SHA512,
-}
-
-// unexpectedMessageError results when the SSH message that we received didn't
-// match what we wanted.
-func unexpectedMessageError(expected, got uint8) error {
-        return fmt.Errorf("ssh: unexpected message type %d (expected %d)", got, expected)
-}
-
-// parseError results from a malformed SSH message.
-func parseError(tag uint8) error {
-        return fmt.Errorf("ssh: parse error in message type %d", tag)
-}
-
-func findCommon(what string, client []string, server []string) (common string, err error) {
-        for _, c := range client {
-                for _, s := range server {
-                        if c == s {
-                                return c, nil
-                        }
-                }
-        }
-        return "", fmt.Errorf("ssh: no common algorithm for %s; client offered: %v, server offered: %v", what, client, server)
-}
-
-type directionAlgorithms struct {
-        Cipher      string
-        MAC         string
-        Compression string
-}
-
-// rekeyBytes returns a rekeying intervals in bytes.
-func (a *directionAlgorithms) rekeyBytes() int64 {
-        // According to RFC4344 block ciphers should rekey after
-        // 2^(BLOCKSIZE/4) blocks. For all AES flavors BLOCKSIZE is
-        // 128.
-        switch a.Cipher {
-        case "aes128-ctr", "aes192-ctr", "aes256-ctr", gcmCipherID, aes128cbcID:
-                return 16 * (1 << 32)
-
-        }
-
-        // For others, stick with RFC4253 recommendation to rekey after 1 Gb of data.
-        return 1 << 30
-}
-
-type algorithms struct {
-        kex     string
-        hostKey string
-        w       directionAlgorithms
-        r       directionAlgorithms
-}
-
-func findAgreedAlgorithms(clientKexInit, serverKexInit *kexInitMsg) (algs *algorithms, err error) {
-        result := &algorithms{}
-
-        result.kex, err = findCommon("key exchange", clientKexInit.KexAlgos, serverKexInit.KexAlgos)
-        if err != nil {
-                return
-        }
-
-        result.hostKey, err = findCommon("host key", clientKexInit.ServerHostKeyAlgos, serverKexInit.ServerHostKeyAlgos)
-        if err != nil {
-                return
-        }
-
-        result.w.Cipher, err = findCommon("client to server cipher", clientKexInit.CiphersClientServer, serverKexInit.CiphersClientServer)
-        if err != nil {
-                return
-        }
-
-        result.r.Cipher, err = findCommon("server to client cipher", clientKexInit.CiphersServerClient, serverKexInit.CiphersServerClient)
-        if err != nil {
-                return
-        }
-
-        result.w.MAC, err = findCommon("client to server MAC", clientKexInit.MACsClientServer, serverKexInit.MACsClientServer)
-        if err != nil {
-                return
-        }
-
-        result.r.MAC, err = findCommon("server to client MAC", clientKexInit.MACsServerClient, serverKexInit.MACsServerClient)
-        if err != nil {
-                return
-        }
-
-        result.w.Compression, err = findCommon("client to server compression", clientKexInit.CompressionClientServer, serverKexInit.CompressionClientServer)
-        if err != nil {
-                return
-        }
-
-        result.r.Compression, err = findCommon("server to client compression", clientKexInit.CompressionServerClient, serverKexInit.CompressionServerClient)
-        if err != nil {
-                return
-        }
-
-        return result, nil
-}
-
-// If rekeythreshold is too small, we can't make any progress sending
-// stuff.
-const minRekeyThreshold uint64 = 256
-
-// Config contains configuration data common to both ServerConfig and
-// ClientConfig.
-type Config struct {
-        // Rand provides the source of entropy for cryptographic
-        // primitives. If Rand is nil, the cryptographic random reader
-        // in package crypto/rand will be used.
-        Rand io.Reader
-
-        // The maximum number of bytes sent or received after which a
-        // new key is negotiated. It must be at least 256. If
-        // unspecified, 1 gigabyte is used.
-        RekeyThreshold uint64
-
-        // The allowed key exchanges algorithms. If unspecified then a
-        // default set of algorithms is used.
-        KeyExchanges []string
-
-        // The allowed cipher algorithms. If unspecified then a sensible
-        // default is used.
-        Ciphers []string
-
-        // The allowed MAC algorithms. If unspecified then a sensible default
-        // is used.
-        MACs []string
-}
-
-// SetDefaults sets sensible values for unset fields in config. This is
-// exported for testing: Configs passed to SSH functions are copied and have
-// default values set automatically.
-func (c *Config) SetDefaults() {
-        if c.Rand == nil {
-                c.Rand = rand.Reader
-        }
-        if c.Ciphers == nil {
-                c.Ciphers = supportedCiphers
-        }
-        var ciphers []string
-        for _, c := range c.Ciphers {
-                if cipherModes[c] != nil {
-                        // reject the cipher if we have no cipherModes definition
-                        ciphers = append(ciphers, c)
-                }
-        }
-        c.Ciphers = ciphers
-
-        if c.KeyExchanges == nil {
-                c.KeyExchanges = supportedKexAlgos
-        }
-
-        if c.MACs == nil {
-                c.MACs = supportedMACs
-        }
-
-        if c.RekeyThreshold == 0 {
-                // RFC 4253, section 9 suggests rekeying after 1G.
-                c.RekeyThreshold = 1 << 30
-        }
-        if c.RekeyThreshold < minRekeyThreshold {
-                c.RekeyThreshold = minRekeyThreshold
-        }
-}
-
-// buildDataSignedForAuth returns the data that is signed in order to prove
-// possession of a private key. See RFC 4252, section 7.
-func buildDataSignedForAuth(sessionId []byte, req userAuthRequestMsg, algo, pubKey []byte) []byte {
-        data := struct {
-                Session []byte
-                Type    byte
-                User    string
-                Service string
-                Method  string
-                Sign    bool
-                Algo    []byte
-                PubKey  []byte
-        }{
-                sessionId,
-                msgUserAuthRequest,
-                req.User,
-                req.Service,
-                req.Method,
-                true,
-                algo,
-                pubKey,
-        }
-        return Marshal(data)
-}
-
-func appendU16(buf []byte, n uint16) []byte {
-        return append(buf, byte(n>>8), byte(n))
-}
-
-func appendU32(buf []byte, n uint32) []byte {
-        return append(buf, byte(n>>24), byte(n>>16), byte(n>>8), byte(n))
-}
-
-func appendU64(buf []byte, n uint64) []byte {
-        return append(buf,
-                byte(n>>56), byte(n>>48), byte(n>>40), byte(n>>32),
-                byte(n>>24), byte(n>>16), byte(n>>8), byte(n))
-}
-
-func appendInt(buf []byte, n int) []byte {
-        return appendU32(buf, uint32(n))
-}
-
-func appendString(buf []byte, s string) []byte {
-        buf = appendU32(buf, uint32(len(s)))
-        buf = append(buf, s...)
-        return buf
-}
-
-func appendBool(buf []byte, b bool) []byte {
-        if b {
-                return append(buf, 1)
-        }
-        return append(buf, 0)
-}
-
-// newCond is a helper to hide the fact that there is no usable zero
-// value for sync.Cond.
-func newCond() *sync.Cond { return sync.NewCond(new(sync.Mutex)) }
-
-// window represents the buffer available to clients
-// wishing to write to a channel.
-type window struct {
-        *sync.Cond
-        win          uint32 // RFC 4254 5.2 says the window size can grow to 2^32-1
-        writeWaiters int
-        closed       bool
-}
-
-// add adds win to the amount of window available
-// for consumers.
-func (w *window) add(win uint32) bool {
-        // a zero sized window adjust is a noop.
-        if win == 0 {
-                return true
-        }
-        w.L.Lock()
-        if w.win+win < win {
-                w.L.Unlock()
-                return false
-        }
-        w.win += win
-        // It is unusual that multiple goroutines would be attempting to reserve
-        // window space, but not guaranteed. Use broadcast to notify all waiters
-        // that additional window is available.
-        w.Broadcast()
-        w.L.Unlock()
-        return true
-}
-
-// close sets the window to closed, so all reservations fail
-// immediately.
-func (w *window) close() {
-        w.L.Lock()
-        w.closed = true
-        w.Broadcast()
-        w.L.Unlock()
-}
-
-// reserve reserves win from the available window capacity.
-// If no capacity remains, reserve will block. reserve may
-// return less than requested.
-func (w *window) reserve(win uint32) (uint32, error) {
-        var err error
-        w.L.Lock()
-        w.writeWaiters++
-        w.Broadcast()
-        for w.win == 0 && !w.closed {
-                w.Wait()
-        }
-        w.writeWaiters--
-        if w.win < win {
-                win = w.win
-        }
-        w.win -= win
-        if w.closed {
-                err = io.EOF
-        }
-        w.L.Unlock()
-        return win, err
-}
-
-// waitWriterBlocked waits until some goroutine is blocked for further
-// writes. It is used in tests only.
-func (w *window) waitWriterBlocked() {
-        w.Cond.L.Lock()
-        for w.writeWaiters == 0 {
-                w.Cond.Wait()
-        }
-        w.Cond.L.Unlock()
-}
diff --git a/vendor/golang.org/x/crypto/ssh/connection.go b/vendor/golang.org/x/crypto/ssh/connection.go
deleted file mode 100644
index e786f2f..0000000
--- a/vendor/golang.org/x/crypto/ssh/connection.go
+++ /dev/null
@@ -1,143 +0,0 @@
-// 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 ssh
-
-import (
-        "fmt"
-        "net"
-)
-
-// OpenChannelError is returned if the other side rejects an
-// OpenChannel request.
-type OpenChannelError struct {
-        Reason  RejectionReason
-        Message string
-}
-
-func (e *OpenChannelError) Error() string {
-        return fmt.Sprintf("ssh: rejected: %s (%s)", e.Reason, e.Message)
-}
-
-// ConnMetadata holds metadata for the connection.
-type ConnMetadata interface {
-        // User returns the user ID for this connection.
-        User() string
-
-        // SessionID returns the sesson hash, also denoted by H.
-        SessionID() []byte
-
-        // ClientVersion returns the client's version string as hashed
-        // into the session ID.
-        ClientVersion() []byte
-
-        // ServerVersion returns the server's version string as hashed
-        // into the session ID.
-        ServerVersion() []byte
-
-        // RemoteAddr returns the remote address for this connection.
-        RemoteAddr() net.Addr
-
-        // LocalAddr returns the local address for this connection.
-        LocalAddr() net.Addr
-}
-
-// Conn represents an SSH connection for both server and client roles.
-// Conn is the basis for implementing an application layer, such
-// as ClientConn, which implements the traditional shell access for
-// clients.
-type Conn interface {
-        ConnMetadata
-
-        // SendRequest sends a global request, and returns the
-        // reply. If wantReply is true, it returns the response status
-        // and payload. See also RFC4254, section 4.
-        SendRequest(name string, wantReply bool, payload []byte) (bool, []byte, error)
-
-        // OpenChannel tries to open an channel. If the request is
-        // rejected, it returns *OpenChannelError. On success it returns
-        // the SSH Channel and a Go channel for incoming, out-of-band
-        // requests. The Go channel must be serviced, or the
-        // connection will hang.
-        OpenChannel(name string, data []byte) (Channel, <-chan *Request, error)
-
-        // Close closes the underlying network connection
-        Close() error
-
-        // Wait blocks until the connection has shut down, and returns the
-        // error causing the shutdown.
-        Wait() error
-
-        // TODO(hanwen): consider exposing:
-        //   RequestKeyChange
-        //   Disconnect
-}
-
-// DiscardRequests consumes and rejects all requests from the
-// passed-in channel.
-func DiscardRequests(in <-chan *Request) {
-        for req := range in {
-                if req.WantReply {
-                        req.Reply(false, nil)
-                }
-        }
-}
-
-// A connection represents an incoming connection.
-type connection struct {
-        transport *handshakeTransport
-        sshConn
-
-        // The connection protocol.
-        *mux
-}
-
-func (c *connection) Close() error {
-        return c.sshConn.conn.Close()
-}
-
-// sshconn provides net.Conn metadata, but disallows direct reads and
-// writes.
-type sshConn struct {
-        conn net.Conn
-
-        user          string
-        sessionID     []byte
-        clientVersion []byte
-        serverVersion []byte
-}
-
-func dup(src []byte) []byte {
-        dst := make([]byte, len(src))
-        copy(dst, src)
-        return dst
-}
-
-func (c *sshConn) User() string {
-        return c.user
-}
-
-func (c *sshConn) RemoteAddr() net.Addr {
-        return c.conn.RemoteAddr()
-}
-
-func (c *sshConn) Close() error {
-        return c.conn.Close()
-}
-
-func (c *sshConn) LocalAddr() net.Addr {
-        return c.conn.LocalAddr()
-}
-
-func (c *sshConn) SessionID() []byte {
-        return dup(c.sessionID)
-}
-
-func (c *sshConn) ClientVersion() []byte {
-        return dup(c.clientVersion)
-}
-
-func (c *sshConn) ServerVersion() []byte {
-        return dup(c.serverVersion)
-}
diff --git a/vendor/golang.org/x/crypto/ssh/doc.go b/vendor/golang.org/x/crypto/ssh/doc.go
deleted file mode 100644
index d6be894..0000000
--- a/vendor/golang.org/x/crypto/ssh/doc.go
+++ /dev/null
@@ -1,18 +0,0 @@
-// 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 ssh implements an SSH client and server.
-
-SSH is a transport security protocol, an authentication protocol and a
-family of application protocols. The most typical application level
-protocol is a remote shell and this is specifically implemented.  However,
-the multiplexed nature of SSH is exposed to users that wish to support
-others.
-
-References:
-  [PROTOCOL.certkeys]: http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/PROTOCOL.certkeys?rev=HEAD
-  [SSH-PARAMETERS]:    http://www.iana.org/assignments/ssh-parameters/ssh-parameters.xml#ssh-parameters-1
-*/
-package ssh // import "golang.org/x/crypto/ssh"
diff --git a/vendor/golang.org/x/crypto/ssh/handshake.go b/vendor/golang.org/x/crypto/ssh/handshake.go
deleted file mode 100644
index 8de6506..0000000
--- a/vendor/golang.org/x/crypto/ssh/handshake.go
+++ /dev/null
@@ -1,625 +0,0 @@
-// 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 ssh
-
-import (
-        "crypto/rand"
-        "errors"
-        "fmt"
-        "io"
-        "log"
-        "net"
-        "sync"
-)
-
-// debugHandshake, if set, prints messages sent and received.  Key
-// exchange messages are printed as if DH were used, so the debug
-// messages are wrong when using ECDH.
-const debugHandshake = false
-
-// chanSize sets the amount of buffering SSH connections. This is
-// primarily for testing: setting chanSize=0 uncovers deadlocks more
-// quickly.
-const chanSize = 16
-
-// keyingTransport is a packet based transport that supports key
-// changes. It need not be thread-safe. It should pass through
-// msgNewKeys in both directions.
-type keyingTransport interface {
-        packetConn
-
-        // prepareKeyChange sets up a key change. The key change for a
-        // direction will be effected if a msgNewKeys message is sent
-        // or received.
-        prepareKeyChange(*algorithms, *kexResult) error
-}
-
-// handshakeTransport implements rekeying on top of a keyingTransport
-// and offers a thread-safe writePacket() interface.
-type handshakeTransport struct {
-        conn   keyingTransport
-        config *Config
-
-        serverVersion []byte
-        clientVersion []byte
-
-        // hostKeys is non-empty if we are the server. In that case,
-        // it contains all host keys that can be used to sign the
-        // connection.
-        hostKeys []Signer
-
-        // hostKeyAlgorithms is non-empty if we are the client. In that case,
-        // we accept these key types from the server as host key.
-        hostKeyAlgorithms []string
-
-        // On read error, incoming is closed, and readError is set.
-        incoming  chan []byte
-        readError error
-
-        mu             sync.Mutex
-        writeError     error
-        sentInitPacket []byte
-        sentInitMsg    *kexInitMsg
-        pendingPackets [][]byte // Used when a key exchange is in progress.
-
-        // If the read loop wants to schedule a kex, it pings this
-        // channel, and the write loop will send out a kex
-        // message.
-        requestKex chan struct{}
-
-        // If the other side requests or confirms a kex, its kexInit
-        // packet is sent here for the write loop to find it.
-        startKex chan *pendingKex
-
-        // data for host key checking
-        hostKeyCallback func(hostname string, remote net.Addr, key PublicKey) error
-        dialAddress     string
-        remoteAddr      net.Addr
-
-        // Algorithms agreed in the last key exchange.
-        algorithms *algorithms
-
-        readPacketsLeft uint32
-        readBytesLeft   int64
-
-        writePacketsLeft uint32
-        writeBytesLeft   int64
-
-        // The session ID or nil if first kex did not complete yet.
-        sessionID []byte
-}
-
-type pendingKex struct {
-        otherInit []byte
-        done      chan error
-}
-
-func newHandshakeTransport(conn keyingTransport, config *Config, clientVersion, serverVersion []byte) *handshakeTransport {
-        t := &handshakeTransport{
-                conn:          conn,
-                serverVersion: serverVersion,
-                clientVersion: clientVersion,
-                incoming:      make(chan []byte, chanSize),
-                requestKex:    make(chan struct{}, 1),
-                startKex:      make(chan *pendingKex, 1),
-
-                config: config,
-        }
-
-        // We always start with a mandatory key exchange.
-        t.requestKex <- struct{}{}
-        return t
-}
-
-func newClientTransport(conn keyingTransport, clientVersion, serverVersion []byte, config *ClientConfig, dialAddr string, addr net.Addr) *handshakeTransport {
-        t := newHandshakeTransport(conn, &config.Config, clientVersion, serverVersion)
-        t.dialAddress = dialAddr
-        t.remoteAddr = addr
-        t.hostKeyCallback = config.HostKeyCallback
-        if config.HostKeyAlgorithms != nil {
-                t.hostKeyAlgorithms = config.HostKeyAlgorithms
-        } else {
-                t.hostKeyAlgorithms = supportedHostKeyAlgos
-        }
-        go t.readLoop()
-        go t.kexLoop()
-        return t
-}
-
-func newServerTransport(conn keyingTransport, clientVersion, serverVersion []byte, config *ServerConfig) *handshakeTransport {
-        t := newHandshakeTransport(conn, &config.Config, clientVersion, serverVersion)
-        t.hostKeys = config.hostKeys
-        go t.readLoop()
-        go t.kexLoop()
-        return t
-}
-
-func (t *handshakeTransport) getSessionID() []byte {
-        return t.sessionID
-}
-
-// waitSession waits for the session to be established. This should be
-// the first thing to call after instantiating handshakeTransport.
-func (t *handshakeTransport) waitSession() error {
-        p, err := t.readPacket()
-        if err != nil {
-                return err
-        }
-        if p[0] != msgNewKeys {
-                return fmt.Errorf("ssh: first packet should be msgNewKeys")
-        }
-
-        return nil
-}
-
-func (t *handshakeTransport) id() string {
-        if len(t.hostKeys) > 0 {
-                return "server"
-        }
-        return "client"
-}
-
-func (t *handshakeTransport) printPacket(p []byte, write bool) {
-        action := "got"
-        if write {
-                action = "sent"
-        }
-
-        if p[0] == msgChannelData || p[0] == msgChannelExtendedData {
-                log.Printf("%s %s data (packet %d bytes)", t.id(), action, len(p))
-        } else {
-                msg, err := decode(p)
-                log.Printf("%s %s %T %v (%v)", t.id(), action, msg, msg, err)
-        }
-}
-
-func (t *handshakeTransport) readPacket() ([]byte, error) {
-        p, ok := <-t.incoming
-        if !ok {
-                return nil, t.readError
-        }
-        return p, nil
-}
-
-func (t *handshakeTransport) readLoop() {
-        first := true
-        for {
-                p, err := t.readOnePacket(first)
-                first = false
-                if err != nil {
-                        t.readError = err
-                        close(t.incoming)
-                        break
-                }
-                if p[0] == msgIgnore || p[0] == msgDebug {
-                        continue
-                }
-                t.incoming <- p
-        }
-
-        // Stop writers too.
-        t.recordWriteError(t.readError)
-
-        // Unblock the writer should it wait for this.
-        close(t.startKex)
-
-        // Don't close t.requestKex; it's also written to from writePacket.
-}
-
-func (t *handshakeTransport) pushPacket(p []byte) error {
-        if debugHandshake {
-                t.printPacket(p, true)
-        }
-        return t.conn.writePacket(p)
-}
-
-func (t *handshakeTransport) getWriteError() error {
-        t.mu.Lock()
-        defer t.mu.Unlock()
-        return t.writeError
-}
-
-func (t *handshakeTransport) recordWriteError(err error) {
-        t.mu.Lock()
-        defer t.mu.Unlock()
-        if t.writeError == nil && err != nil {
-                t.writeError = err
-        }
-}
-
-func (t *handshakeTransport) requestKeyExchange() {
-        select {
-        case t.requestKex <- struct{}{}:
-        default:
-                // something already requested a kex, so do nothing.
-        }
-}
-
-func (t *handshakeTransport) kexLoop() {
-
-write:
-        for t.getWriteError() == nil {
-                var request *pendingKex
-                var sent bool
-
-                for request == nil || !sent {
-                        var ok bool
-                        select {
-                        case request, ok = <-t.startKex:
-                                if !ok {
-                                        break write
-                                }
-                        case <-t.requestKex:
-                                break
-                        }
-
-                        if !sent {
-                                if err := t.sendKexInit(); err != nil {
-                                        t.recordWriteError(err)
-                                        break
-                                }
-                                sent = true
-                        }
-                }
-
-                if err := t.getWriteError(); err != nil {
-                        if request != nil {
-                                request.done <- err
-                        }
-                        break
-                }
-
-                // We're not servicing t.requestKex, but that is OK:
-                // we never block on sending to t.requestKex.
-
-                // We're not servicing t.startKex, but the remote end
-                // has just sent us a kexInitMsg, so it can't send
-                // another key change request, until we close the done
-                // channel on the pendingKex request.
-
-                err := t.enterKeyExchange(request.otherInit)
-
-                t.mu.Lock()
-                t.writeError = err
-                t.sentInitPacket = nil
-                t.sentInitMsg = nil
-                t.writePacketsLeft = packetRekeyThreshold
-                if t.config.RekeyThreshold > 0 {
-                        t.writeBytesLeft = int64(t.config.RekeyThreshold)
-                } else if t.algorithms != nil {
-                        t.writeBytesLeft = t.algorithms.w.rekeyBytes()
-                }
-
-                // we have completed the key exchange. Since the
-                // reader is still blocked, it is safe to clear out
-                // the requestKex channel. This avoids the situation
-                // where: 1) we consumed our own request for the
-                // initial kex, and 2) the kex from the remote side
-                // caused another send on the requestKex channel,
-        clear:
-                for {
-                        select {
-                        case <-t.requestKex:
-                                //
-                        default:
-                                break clear
-                        }
-                }
-
-                request.done <- t.writeError
-
-                // kex finished. Push packets that we received while
-                // the kex was in progress. Don't look at t.startKex
-                // and don't increment writtenSinceKex: if we trigger
-                // another kex while we are still busy with the last
-                // one, things will become very confusing.
-                for _, p := range t.pendingPackets {
-                        t.writeError = t.pushPacket(p)
-                        if t.writeError != nil {
-                                break
-                        }
-                }
-                t.pendingPackets = t.pendingPackets[:0]
-                t.mu.Unlock()
-        }
-
-        // drain startKex channel. We don't service t.requestKex
-        // because nobody does blocking sends there.
-        go func() {
-                for init := range t.startKex {
-                        init.done <- t.writeError
-                }
-        }()
-
-        // Unblock reader.
-        t.conn.Close()
-}
-
-// The protocol uses uint32 for packet counters, so we can't let them
-// reach 1<<32.  We will actually read and write more packets than
-// this, though: the other side may send more packets, and after we
-// hit this limit on writing we will send a few more packets for the
-// key exchange itself.
-const packetRekeyThreshold = (1 << 31)
-
-func (t *handshakeTransport) readOnePacket(first bool) ([]byte, error) {
-        p, err := t.conn.readPacket()
-        if err != nil {
-                return nil, err
-        }
-
-        if t.readPacketsLeft > 0 {
-                t.readPacketsLeft--
-        } else {
-                t.requestKeyExchange()
-        }
-
-        if t.readBytesLeft > 0 {
-                t.readBytesLeft -= int64(len(p))
-        } else {
-                t.requestKeyExchange()
-        }
-
-        if debugHandshake {
-                t.printPacket(p, false)
-        }
-
-        if first && p[0] != msgKexInit {
-                return nil, fmt.Errorf("ssh: first packet should be msgKexInit")
-        }
-
-        if p[0] != msgKexInit {
-                return p, nil
-        }
-
-        firstKex := t.sessionID == nil
-
-        kex := pendingKex{
-                done:      make(chan error, 1),
-                otherInit: p,
-        }
-        t.startKex <- &kex
-        err = <-kex.done
-
-        if debugHandshake {
-                log.Printf("%s exited key exchange (first %v), err %v", t.id(), firstKex, err)
-        }
-
-        if err != nil {
-                return nil, err
-        }
-
-        t.readPacketsLeft = packetRekeyThreshold
-        if t.config.RekeyThreshold > 0 {
-                t.readBytesLeft = int64(t.config.RekeyThreshold)
-        } else {
-                t.readBytesLeft = t.algorithms.r.rekeyBytes()
-        }
-
-        // By default, a key exchange is hidden from higher layers by
-        // translating it into msgIgnore.
-        successPacket := []byte{msgIgnore}
-        if firstKex {
-                // sendKexInit() for the first kex waits for
-                // msgNewKeys so the authentication process is
-                // guaranteed to happen over an encrypted transport.
-                successPacket = []byte{msgNewKeys}
-        }
-
-        return successPacket, nil
-}
-
-// sendKexInit sends a key change message.
-func (t *handshakeTransport) sendKexInit() error {
-        t.mu.Lock()
-        defer t.mu.Unlock()
-        if t.sentInitMsg != nil {
-                // kexInits may be sent either in response to the other side,
-                // or because our side wants to initiate a key change, so we
-                // may have already sent a kexInit. In that case, don't send a
-                // second kexInit.
-                return nil
-        }
-
-        msg := &kexInitMsg{
-                KexAlgos:                t.config.KeyExchanges,
-                CiphersClientServer:     t.config.Ciphers,
-                CiphersServerClient:     t.config.Ciphers,
-                MACsClientServer:        t.config.MACs,
-                MACsServerClient:        t.config.MACs,
-                CompressionClientServer: supportedCompressions,
-                CompressionServerClient: supportedCompressions,
-        }
-        io.ReadFull(rand.Reader, msg.Cookie[:])
-
-        if len(t.hostKeys) > 0 {
-                for _, k := range t.hostKeys {
-                        msg.ServerHostKeyAlgos = append(
-                                msg.ServerHostKeyAlgos, k.PublicKey().Type())
-                }
-        } else {
-                msg.ServerHostKeyAlgos = t.hostKeyAlgorithms
-        }
-        packet := Marshal(msg)
-
-        // writePacket destroys the contents, so save a copy.
-        packetCopy := make([]byte, len(packet))
-        copy(packetCopy, packet)
-
-        if err := t.pushPacket(packetCopy); err != nil {
-                return err
-        }
-
-        t.sentInitMsg = msg
-        t.sentInitPacket = packet
-
-        return nil
-}
-
-func (t *handshakeTransport) writePacket(p []byte) error {
-        switch p[0] {
-        case msgKexInit:
-                return errors.New("ssh: only handshakeTransport can send kexInit")
-        case msgNewKeys:
-                return errors.New("ssh: only handshakeTransport can send newKeys")
-        }
-
-        t.mu.Lock()
-        defer t.mu.Unlock()
-        if t.writeError != nil {
-                return t.writeError
-        }
-
-        if t.sentInitMsg != nil {
-                // Copy the packet so the writer can reuse the buffer.
-                cp := make([]byte, len(p))
-                copy(cp, p)
-                t.pendingPackets = append(t.pendingPackets, cp)
-                return nil
-        }
-
-        if t.writeBytesLeft > 0 {
-                t.writeBytesLeft -= int64(len(p))
-        } else {
-                t.requestKeyExchange()
-        }
-
-        if t.writePacketsLeft > 0 {
-                t.writePacketsLeft--
-        } else {
-                t.requestKeyExchange()
-        }
-
-        if err := t.pushPacket(p); err != nil {
-                t.writeError = err
-        }
-
-        return nil
-}
-
-func (t *handshakeTransport) Close() error {
-        return t.conn.Close()
-}
-
-func (t *handshakeTransport) enterKeyExchange(otherInitPacket []byte) error {
-        if debugHandshake {
-                log.Printf("%s entered key exchange", t.id())
-        }
-
-        otherInit := &kexInitMsg{}
-        if err := Unmarshal(otherInitPacket, otherInit); err != nil {
-                return err
-        }
-
-        magics := handshakeMagics{
-                clientVersion: t.clientVersion,
-                serverVersion: t.serverVersion,
-                clientKexInit: otherInitPacket,
-                serverKexInit: t.sentInitPacket,
-        }
-
-        clientInit := otherInit
-        serverInit := t.sentInitMsg
-        if len(t.hostKeys) == 0 {
-                clientInit, serverInit = serverInit, clientInit
-
-                magics.clientKexInit = t.sentInitPacket
-                magics.serverKexInit = otherInitPacket
-        }
-
-        var err error
-        t.algorithms, err = findAgreedAlgorithms(clientInit, serverInit)
-        if err != nil {
-                return err
-        }
-
-        // We don't send FirstKexFollows, but we handle receiving it.
-        //
-        // RFC 4253 section 7 defines the kex and the agreement method for
-        // first_kex_packet_follows. It states that the guessed packet
-        // should be ignored if the "kex algorithm and/or the host
-        // key algorithm is guessed wrong (server and client have
-        // different preferred algorithm), or if any of the other
-        // algorithms cannot be agreed upon". The other algorithms have
-        // already been checked above so the kex algorithm and host key
-        // algorithm are checked here.
-        if otherInit.FirstKexFollows && (clientInit.KexAlgos[0] != serverInit.KexAlgos[0] || clientInit.ServerHostKeyAlgos[0] != serverInit.ServerHostKeyAlgos[0]) {
-                // other side sent a kex message for the wrong algorithm,
-                // which we have to ignore.
-                if _, err := t.conn.readPacket(); err != nil {
-                        return err
-                }
-        }
-
-        kex, ok := kexAlgoMap[t.algorithms.kex]
-        if !ok {
-                return fmt.Errorf("ssh: unexpected key exchange algorithm %v", t.algorithms.kex)
-        }
-
-        var result *kexResult
-        if len(t.hostKeys) > 0 {
-                result, err = t.server(kex, t.algorithms, &magics)
-        } else {
-                result, err = t.client(kex, t.algorithms, &magics)
-        }
-
-        if err != nil {
-                return err
-        }
-
-        if t.sessionID == nil {
-                t.sessionID = result.H
-        }
-        result.SessionID = t.sessionID
-
-        t.conn.prepareKeyChange(t.algorithms, result)
-        if err = t.conn.writePacket([]byte{msgNewKeys}); err != nil {
-                return err
-        }
-        if packet, err := t.conn.readPacket(); err != nil {
-                return err
-        } else if packet[0] != msgNewKeys {
-                return unexpectedMessageError(msgNewKeys, packet[0])
-        }
-
-        return nil
-}
-
-func (t *handshakeTransport) server(kex kexAlgorithm, algs *algorithms, magics *handshakeMagics) (*kexResult, error) {
-        var hostKey Signer
-        for _, k := range t.hostKeys {
-                if algs.hostKey == k.PublicKey().Type() {
-                        hostKey = k
-                }
-        }
-
-        r, err := kex.Server(t.conn, t.config.Rand, magics, hostKey)
-        return r, err
-}
-
-func (t *handshakeTransport) client(kex kexAlgorithm, algs *algorithms, magics *handshakeMagics) (*kexResult, error) {
-        result, err := kex.Client(t.conn, t.config.Rand, magics)
-        if err != nil {
-                return nil, err
-        }
-
-        hostKey, err := ParsePublicKey(result.HostKey)
-        if err != nil {
-                return nil, err
-        }
-
-        if err := verifyHostKeySignature(hostKey, result); err != nil {
-                return nil, err
-        }
-
-        if t.hostKeyCallback != nil {
-                err = t.hostKeyCallback(t.dialAddress, t.remoteAddr, hostKey)
-                if err != nil {
-                        return nil, err
-                }
-        }
-
-        return result, nil
-}
diff --git a/vendor/golang.org/x/crypto/ssh/kex.go b/vendor/golang.org/x/crypto/ssh/kex.go
deleted file mode 100644
index c87fbeb..0000000
--- a/vendor/golang.org/x/crypto/ssh/kex.go
+++ /dev/null
@@ -1,540 +0,0 @@
-// 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 ssh
-
-import (
-        "crypto"
-        "crypto/ecdsa"
-        "crypto/elliptic"
-        "crypto/rand"
-        "crypto/subtle"
-        "errors"
-        "io"
-        "math/big"
-
-        "golang.org/x/crypto/curve25519"
-)
-
-const (
-        kexAlgoDH1SHA1          = "diffie-hellman-group1-sha1"
-        kexAlgoDH14SHA1         = "diffie-hellman-group14-sha1"
-        kexAlgoECDH256          = "ecdh-sha2-nistp256"
-        kexAlgoECDH384          = "ecdh-sha2-nistp384"
-        kexAlgoECDH521          = "ecdh-sha2-nistp521"
-        kexAlgoCurve25519SHA256 = "curve25519-sha256@libssh.org"
-)
-
-// kexResult captures the outcome of a key exchange.
-type kexResult struct {
-        // Session hash. See also RFC 4253, section 8.
-        H []byte
-
-        // Shared secret. See also RFC 4253, section 8.
-        K []byte
-
-        // Host key as hashed into H.
-        HostKey []byte
-
-        // Signature of H.
-        Signature []byte
-
-        // A cryptographic hash function that matches the security
-        // level of the key exchange algorithm. It is used for
-        // calculating H, and for deriving keys from H and K.
-        Hash crypto.Hash
-
-        // The session ID, which is the first H computed. This is used
-        // to derive key material inside the transport.
-        SessionID []byte
-}
-
-// handshakeMagics contains data that is always included in the
-// session hash.
-type handshakeMagics struct {
-        clientVersion, serverVersion []byte
-        clientKexInit, serverKexInit []byte
-}
-
-func (m *handshakeMagics) write(w io.Writer) {
-        writeString(w, m.clientVersion)
-        writeString(w, m.serverVersion)
-        writeString(w, m.clientKexInit)
-        writeString(w, m.serverKexInit)
-}
-
-// kexAlgorithm abstracts different key exchange algorithms.
-type kexAlgorithm interface {
-        // Server runs server-side key agreement, signing the result
-        // with a hostkey.
-        Server(p packetConn, rand io.Reader, magics *handshakeMagics, s Signer) (*kexResult, error)
-
-        // Client runs the client-side key agreement. Caller is
-        // responsible for verifying the host key signature.
-        Client(p packetConn, rand io.Reader, magics *handshakeMagics) (*kexResult, error)
-}
-
-// dhGroup is a multiplicative group suitable for implementing Diffie-Hellman key agreement.
-type dhGroup struct {
-        g, p, pMinus1 *big.Int
-}
-
-func (group *dhGroup) diffieHellman(theirPublic, myPrivate *big.Int) (*big.Int, error) {
-        if theirPublic.Cmp(bigOne) <= 0 || theirPublic.Cmp(group.pMinus1) >= 0 {
-                return nil, errors.New("ssh: DH parameter out of bounds")
-        }
-        return new(big.Int).Exp(theirPublic, myPrivate, group.p), nil
-}
-
-func (group *dhGroup) Client(c packetConn, randSource io.Reader, magics *handshakeMagics) (*kexResult, error) {
-        hashFunc := crypto.SHA1
-
-        var x *big.Int
-        for {
-                var err error
-                if x, err = rand.Int(randSource, group.pMinus1); err != nil {
-                        return nil, err
-                }
-                if x.Sign() > 0 {
-                        break
-                }
-        }
-
-        X := new(big.Int).Exp(group.g, x, group.p)
-        kexDHInit := kexDHInitMsg{
-                X: X,
-        }
-        if err := c.writePacket(Marshal(&kexDHInit)); err != nil {
-                return nil, err
-        }
-
-        packet, err := c.readPacket()
-        if err != nil {
-                return nil, err
-        }
-
-        var kexDHReply kexDHReplyMsg
-        if err = Unmarshal(packet, &kexDHReply); err != nil {
-                return nil, err
-        }
-
-        kInt, err := group.diffieHellman(kexDHReply.Y, x)
-        if err != nil {
-                return nil, err
-        }
-
-        h := hashFunc.New()
-        magics.write(h)
-        writeString(h, kexDHReply.HostKey)
-        writeInt(h, X)
-        writeInt(h, kexDHReply.Y)
-        K := make([]byte, intLength(kInt))
-        marshalInt(K, kInt)
-        h.Write(K)
-
-        return &kexResult{
-                H:         h.Sum(nil),
-                K:         K,
-                HostKey:   kexDHReply.HostKey,
-                Signature: kexDHReply.Signature,
-                Hash:      crypto.SHA1,
-        }, nil
-}
-
-func (group *dhGroup) Server(c packetConn, randSource io.Reader, magics *handshakeMagics, priv Signer) (result *kexResult, err error) {
-        hashFunc := crypto.SHA1
-        packet, err := c.readPacket()
-        if err != nil {
-                return
-        }
-        var kexDHInit kexDHInitMsg
-        if err = Unmarshal(packet, &kexDHInit); err != nil {
-                return
-        }
-
-        var y *big.Int
-        for {
-                if y, err = rand.Int(randSource, group.pMinus1); err != nil {
-                        return
-                }
-                if y.Sign() > 0 {
-                        break
-                }
-        }
-
-        Y := new(big.Int).Exp(group.g, y, group.p)
-        kInt, err := group.diffieHellman(kexDHInit.X, y)
-        if err != nil {
-                return nil, err
-        }
-
-        hostKeyBytes := priv.PublicKey().Marshal()
-
-        h := hashFunc.New()
-        magics.write(h)
-        writeString(h, hostKeyBytes)
-        writeInt(h, kexDHInit.X)
-        writeInt(h, Y)
-
-        K := make([]byte, intLength(kInt))
-        marshalInt(K, kInt)
-        h.Write(K)
-
-        H := h.Sum(nil)
-
-        // H is already a hash, but the hostkey signing will apply its
-        // own key-specific hash algorithm.
-        sig, err := signAndMarshal(priv, randSource, H)
-        if err != nil {
-                return nil, err
-        }
-
-        kexDHReply := kexDHReplyMsg{
-                HostKey:   hostKeyBytes,
-                Y:         Y,
-                Signature: sig,
-        }
-        packet = Marshal(&kexDHReply)
-
-        err = c.writePacket(packet)
-        return &kexResult{
-                H:         H,
-                K:         K,
-                HostKey:   hostKeyBytes,
-                Signature: sig,
-                Hash:      crypto.SHA1,
-        }, nil
-}
-
-// ecdh performs Elliptic Curve Diffie-Hellman key exchange as
-// described in RFC 5656, section 4.
-type ecdh struct {
-        curve elliptic.Curve
-}
-
-func (kex *ecdh) Client(c packetConn, rand io.Reader, magics *handshakeMagics) (*kexResult, error) {
-        ephKey, err := ecdsa.GenerateKey(kex.curve, rand)
-        if err != nil {
-                return nil, err
-        }
-
-        kexInit := kexECDHInitMsg{
-                ClientPubKey: elliptic.Marshal(kex.curve, ephKey.PublicKey.X, ephKey.PublicKey.Y),
-        }
-
-        serialized := Marshal(&kexInit)
-        if err := c.writePacket(serialized); err != nil {
-                return nil, err
-        }
-
-        packet, err := c.readPacket()
-        if err != nil {
-                return nil, err
-        }
-
-        var reply kexECDHReplyMsg
-        if err = Unmarshal(packet, &reply); err != nil {
-                return nil, err
-        }
-
-        x, y, err := unmarshalECKey(kex.curve, reply.EphemeralPubKey)
-        if err != nil {
-                return nil, err
-        }
-
-        // generate shared secret
-        secret, _ := kex.curve.ScalarMult(x, y, ephKey.D.Bytes())
-
-        h := ecHash(kex.curve).New()
-        magics.write(h)
-        writeString(h, reply.HostKey)
-        writeString(h, kexInit.ClientPubKey)
-        writeString(h, reply.EphemeralPubKey)
-        K := make([]byte, intLength(secret))
-        marshalInt(K, secret)
-        h.Write(K)
-
-        return &kexResult{
-                H:         h.Sum(nil),
-                K:         K,
-                HostKey:   reply.HostKey,
-                Signature: reply.Signature,
-                Hash:      ecHash(kex.curve),
-        }, nil
-}
-
-// unmarshalECKey parses and checks an EC key.
-func unmarshalECKey(curve elliptic.Curve, pubkey []byte) (x, y *big.Int, err error) {
-        x, y = elliptic.Unmarshal(curve, pubkey)
-        if x == nil {
-                return nil, nil, errors.New("ssh: elliptic.Unmarshal failure")
-        }
-        if !validateECPublicKey(curve, x, y) {
-                return nil, nil, errors.New("ssh: public key not on curve")
-        }
-        return x, y, nil
-}
-
-// validateECPublicKey checks that the point is a valid public key for
-// the given curve. See [SEC1], 3.2.2
-func validateECPublicKey(curve elliptic.Curve, x, y *big.Int) bool {
-        if x.Sign() == 0 && y.Sign() == 0 {
-                return false
-        }
-
-        if x.Cmp(curve.Params().P) >= 0 {
-                return false
-        }
-
-        if y.Cmp(curve.Params().P) >= 0 {
-                return false
-        }
-
-        if !curve.IsOnCurve(x, y) {
-                return false
-        }
-
-        // We don't check if N * PubKey == 0, since
-        //
-        // - the NIST curves have cofactor = 1, so this is implicit.
-        // (We don't foresee an implementation that supports non NIST
-        // curves)
-        //
-        // - for ephemeral keys, we don't need to worry about small
-        // subgroup attacks.
-        return true
-}
-
-func (kex *ecdh) Server(c packetConn, rand io.Reader, magics *handshakeMagics, priv Signer) (result *kexResult, err error) {
-        packet, err := c.readPacket()
-        if err != nil {
-                return nil, err
-        }
-
-        var kexECDHInit kexECDHInitMsg
-        if err = Unmarshal(packet, &kexECDHInit); err != nil {
-                return nil, err
-        }
-
-        clientX, clientY, err := unmarshalECKey(kex.curve, kexECDHInit.ClientPubKey)
-        if err != nil {
-                return nil, err
-        }
-
-        // We could cache this key across multiple users/multiple
-        // connection attempts, but the benefit is small. OpenSSH
-        // generates a new key for each incoming connection.
-        ephKey, err := ecdsa.GenerateKey(kex.curve, rand)
-        if err != nil {
-                return nil, err
-        }
-
-        hostKeyBytes := priv.PublicKey().Marshal()
-
-        serializedEphKey := elliptic.Marshal(kex.curve, ephKey.PublicKey.X, ephKey.PublicKey.Y)
-
-        // generate shared secret
-        secret, _ := kex.curve.ScalarMult(clientX, clientY, ephKey.D.Bytes())
-
-        h := ecHash(kex.curve).New()
-        magics.write(h)
-        writeString(h, hostKeyBytes)
-        writeString(h, kexECDHInit.ClientPubKey)
-        writeString(h, serializedEphKey)
-
-        K := make([]byte, intLength(secret))
-        marshalInt(K, secret)
-        h.Write(K)
-
-        H := h.Sum(nil)
-
-        // H is already a hash, but the hostkey signing will apply its
-        // own key-specific hash algorithm.
-        sig, err := signAndMarshal(priv, rand, H)
-        if err != nil {
-                return nil, err
-        }
-
-        reply := kexECDHReplyMsg{
-                EphemeralPubKey: serializedEphKey,
-                HostKey:         hostKeyBytes,
-                Signature:       sig,
-        }
-
-        serialized := Marshal(&reply)
-        if err := c.writePacket(serialized); err != nil {
-                return nil, err
-        }
-
-        return &kexResult{
-                H:         H,
-                K:         K,
-                HostKey:   reply.HostKey,
-                Signature: sig,
-                Hash:      ecHash(kex.curve),
-        }, nil
-}
-
-var kexAlgoMap = map[string]kexAlgorithm{}
-
-func init() {
-        // This is the group called diffie-hellman-group1-sha1 in RFC
-        // 4253 and Oakley Group 2 in RFC 2409.
-        p, _ := new(big.Int).SetString("FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF", 16)
-        kexAlgoMap[kexAlgoDH1SHA1] = &dhGroup{
-                g: new(big.Int).SetInt64(2),
-                p: p,
-                pMinus1: new(big.Int).Sub(p, bigOne),
-        }
-
-        // This is the group called diffie-hellman-group14-sha1 in RFC
-        // 4253 and Oakley Group 14 in RFC 3526.
-        p, _ = new(big.Int).SetString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
-
-        kexAlgoMap[kexAlgoDH14SHA1] = &dhGroup{
-                g: new(big.Int).SetInt64(2),
-                p: p,
-                pMinus1: new(big.Int).Sub(p, bigOne),
-        }
-
-        kexAlgoMap[kexAlgoECDH521] = &ecdh{elliptic.P521()}
-        kexAlgoMap[kexAlgoECDH384] = &ecdh{elliptic.P384()}
-        kexAlgoMap[kexAlgoECDH256] = &ecdh{elliptic.P256()}
-        kexAlgoMap[kexAlgoCurve25519SHA256] = &curve25519sha256{}
-}
-
-// curve25519sha256 implements the curve25519-sha256@libssh.org key
-// agreement protocol, as described in
-// https://git.libssh.org/projects/libssh.git/tree/doc/curve25519-sha256@libssh.org.txt
-type curve25519sha256 struct{}
-
-type curve25519KeyPair struct {
-        priv [32]byte
-        pub  [32]byte
-}
-
-func (kp *curve25519KeyPair) generate(rand io.Reader) error {
-        if _, err := io.ReadFull(rand, kp.priv[:]); err != nil {
-                return err
-        }
-        curve25519.ScalarBaseMult(&kp.pub, &kp.priv)
-        return nil
-}
-
-// curve25519Zeros is just an array of 32 zero bytes so that we have something
-// convenient to compare against in order to reject curve25519 points with the
-// wrong order.
-var curve25519Zeros [32]byte
-
-func (kex *curve25519sha256) Client(c packetConn, rand io.Reader, magics *handshakeMagics) (*kexResult, error) {
-        var kp curve25519KeyPair
-        if err := kp.generate(rand); err != nil {
-                return nil, err
-        }
-        if err := c.writePacket(Marshal(&kexECDHInitMsg{kp.pub[:]})); err != nil {
-                return nil, err
-        }
-
-        packet, err := c.readPacket()
-        if err != nil {
-                return nil, err
-        }
-
-        var reply kexECDHReplyMsg
-        if err = Unmarshal(packet, &reply); err != nil {
-                return nil, err
-        }
-        if len(reply.EphemeralPubKey) != 32 {
-                return nil, errors.New("ssh: peer's curve25519 public value has wrong length")
-        }
-
-        var servPub, secret [32]byte
-        copy(servPub[:], reply.EphemeralPubKey)
-        curve25519.ScalarMult(&secret, &kp.priv, &servPub)
-        if subtle.ConstantTimeCompare(secret[:], curve25519Zeros[:]) == 1 {
-                return nil, errors.New("ssh: peer's curve25519 public value has wrong order")
-        }
-
-        h := crypto.SHA256.New()
-        magics.write(h)
-        writeString(h, reply.HostKey)
-        writeString(h, kp.pub[:])
-        writeString(h, reply.EphemeralPubKey)
-
-        kInt := new(big.Int).SetBytes(secret[:])
-        K := make([]byte, intLength(kInt))
-        marshalInt(K, kInt)
-        h.Write(K)
-
-        return &kexResult{
-                H:         h.Sum(nil),
-                K:         K,
-                HostKey:   reply.HostKey,
-                Signature: reply.Signature,
-                Hash:      crypto.SHA256,
-        }, nil
-}
-
-func (kex *curve25519sha256) Server(c packetConn, rand io.Reader, magics *handshakeMagics, priv Signer) (result *kexResult, err error) {
-        packet, err := c.readPacket()
-        if err != nil {
-                return
-        }
-        var kexInit kexECDHInitMsg
-        if err = Unmarshal(packet, &kexInit); err != nil {
-                return
-        }
-
-        if len(kexInit.ClientPubKey) != 32 {
-                return nil, errors.New("ssh: peer's curve25519 public value has wrong length")
-        }
-
-        var kp curve25519KeyPair
-        if err := kp.generate(rand); err != nil {
-                return nil, err
-        }
-
-        var clientPub, secret [32]byte
-        copy(clientPub[:], kexInit.ClientPubKey)
-        curve25519.ScalarMult(&secret, &kp.priv, &clientPub)
-        if subtle.ConstantTimeCompare(secret[:], curve25519Zeros[:]) == 1 {
-                return nil, errors.New("ssh: peer's curve25519 public value has wrong order")
-        }
-
-        hostKeyBytes := priv.PublicKey().Marshal()
-
-        h := crypto.SHA256.New()
-        magics.write(h)
-        writeString(h, hostKeyBytes)
-        writeString(h, kexInit.ClientPubKey)
-        writeString(h, kp.pub[:])
-
-        kInt := new(big.Int).SetBytes(secret[:])
-        K := make([]byte, intLength(kInt))
-        marshalInt(K, kInt)
-        h.Write(K)
-
-        H := h.Sum(nil)
-
-        sig, err := signAndMarshal(priv, rand, H)
-        if err != nil {
-                return nil, err
-        }
-
-        reply := kexECDHReplyMsg{
-                EphemeralPubKey: kp.pub[:],
-                HostKey:         hostKeyBytes,
-                Signature:       sig,
-        }
-        if err := c.writePacket(Marshal(&reply)); err != nil {
-                return nil, err
-        }
-        return &kexResult{
-                H:         H,
-                K:         K,
-                HostKey:   hostKeyBytes,
-                Signature: sig,
-                Hash:      crypto.SHA256,
-        }, nil
-}
diff --git a/vendor/golang.org/x/crypto/ssh/keys.go b/vendor/golang.org/x/crypto/ssh/keys.go
deleted file mode 100644
index f38de98..0000000
--- a/vendor/golang.org/x/crypto/ssh/keys.go
+++ /dev/null
@@ -1,905 +0,0 @@
-// 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 ssh
-
-import (
-        "bytes"
-        "crypto"
-        "crypto/dsa"
-        "crypto/ecdsa"
-        "crypto/elliptic"
-        "crypto/md5"
-        "crypto/rsa"
-        "crypto/sha256"
-        "crypto/x509"
-        "encoding/asn1"
-        "encoding/base64"
-        "encoding/hex"
-        "encoding/pem"
-        "errors"
-        "fmt"
-        "io"
-        "math/big"
-        "strings"
-
-        "golang.org/x/crypto/ed25519"
-)
-
-// These constants represent the algorithm names for key types supported by this
-// package.
-const (
-        KeyAlgoRSA      = "ssh-rsa"
-        KeyAlgoDSA      = "ssh-dss"
-        KeyAlgoECDSA256 = "ecdsa-sha2-nistp256"
-        KeyAlgoECDSA384 = "ecdsa-sha2-nistp384"
-        KeyAlgoECDSA521 = "ecdsa-sha2-nistp521"
-        KeyAlgoED25519  = "ssh-ed25519"
-)
-
-// parsePubKey parses a public key of the given algorithm.
-// Use ParsePublicKey for keys with prepended algorithm.
-func parsePubKey(in []byte, algo string) (pubKey PublicKey, rest []byte, err error) {
-        switch algo {
-        case KeyAlgoRSA:
-                return parseRSA(in)
-        case KeyAlgoDSA:
-                return parseDSA(in)
-        case KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521:
-                return parseECDSA(in)
-        case KeyAlgoED25519:
-                return parseED25519(in)
-        case CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01, CertAlgoECDSA384v01, CertAlgoECDSA521v01, CertAlgoED25519v01:
-                cert, err := parseCert(in, certToPrivAlgo(algo))
-                if err != nil {
-                        return nil, nil, err
-                }
-                return cert, nil, nil
-        }
-        return nil, nil, fmt.Errorf("ssh: unknown key algorithm: %v", algo)
-}
-
-// parseAuthorizedKey parses a public key in OpenSSH authorized_keys format
-// (see sshd(8) manual page) once the options and key type fields have been
-// removed.
-func parseAuthorizedKey(in []byte) (out PublicKey, comment string, err error) {
-        in = bytes.TrimSpace(in)
-
-        i := bytes.IndexAny(in, " \t")
-        if i == -1 {
-                i = len(in)
-        }
-        base64Key := in[:i]
-
-        key := make([]byte, base64.StdEncoding.DecodedLen(len(base64Key)))
-        n, err := base64.StdEncoding.Decode(key, base64Key)
-        if err != nil {
-                return nil, "", err
-        }
-        key = key[:n]
-        out, err = ParsePublicKey(key)
-        if err != nil {
-                return nil, "", err
-        }
-        comment = string(bytes.TrimSpace(in[i:]))
-        return out, comment, nil
-}
-
-// ParseKnownHosts parses an entry in the format of the known_hosts file.
-//
-// The known_hosts format is documented in the sshd(8) manual page. This
-// function will parse a single entry from in. On successful return, marker
-// will contain the optional marker value (i.e. "cert-authority" or "revoked")
-// or else be empty, hosts will contain the hosts that this entry matches,
-// pubKey will contain the public key and comment will contain any trailing
-// comment at the end of the line. See the sshd(8) manual page for the various
-// forms that a host string can take.
-//
-// The unparsed remainder of the input will be returned in rest. This function
-// can be called repeatedly to parse multiple entries.
-//
-// If no entries were found in the input then err will be io.EOF. Otherwise a
-// non-nil err value indicates a parse error.
-func ParseKnownHosts(in []byte) (marker string, hosts []string, pubKey PublicKey, comment string, rest []byte, err error) {
-        for len(in) > 0 {
-                end := bytes.IndexByte(in, '\n')
-                if end != -1 {
-                        rest = in[end+1:]
-                        in = in[:end]
-                } else {
-                        rest = nil
-                }
-
-                end = bytes.IndexByte(in, '\r')
-                if end != -1 {
-                        in = in[:end]
-                }
-
-                in = bytes.TrimSpace(in)
-                if len(in) == 0 || in[0] == '#' {
-                        in = rest
-                        continue
-                }
-
-                i := bytes.IndexAny(in, " \t")
-                if i == -1 {
-                        in = rest
-                        continue
-                }
-
-                // Strip out the beginning of the known_host key.
-                // This is either an optional marker or a (set of) hostname(s).
-                keyFields := bytes.Fields(in)
-                if len(keyFields) < 3 || len(keyFields) > 5 {
-                        return "", nil, nil, "", nil, errors.New("ssh: invalid entry in known_hosts data")
-                }
-
-                // keyFields[0] is either "@cert-authority", "@revoked" or a comma separated
-                // list of hosts
-                marker := ""
-                if keyFields[0][0] == '@' {
-                        marker = string(keyFields[0][1:])
-                        keyFields = keyFields[1:]
-                }
-
-                hosts := string(keyFields[0])
-                // keyFields[1] contains the key type (e.g. “ssh-rsa”).
-                // However, that information is duplicated inside the
-                // base64-encoded key and so is ignored here.
-
-                key := bytes.Join(keyFields[2:], []byte(" "))
-                if pubKey, comment, err = parseAuthorizedKey(key); err != nil {
-                        return "", nil, nil, "", nil, err
-                }
-
-                return marker, strings.Split(hosts, ","), pubKey, comment, rest, nil
-        }
-
-        return "", nil, nil, "", nil, io.EOF
-}
-
-// ParseAuthorizedKeys parses a public key from an authorized_keys
-// file used in OpenSSH according to the sshd(8) manual page.
-func ParseAuthorizedKey(in []byte) (out PublicKey, comment string, options []string, rest []byte, err error) {
-        for len(in) > 0 {
-                end := bytes.IndexByte(in, '\n')
-                if end != -1 {
-                        rest = in[end+1:]
-                        in = in[:end]
-                } else {
-                        rest = nil
-                }
-
-                end = bytes.IndexByte(in, '\r')
-                if end != -1 {
-                        in = in[:end]
-                }
-
-                in = bytes.TrimSpace(in)
-                if len(in) == 0 || in[0] == '#' {
-                        in = rest
-                        continue
-                }
-
-                i := bytes.IndexAny(in, " \t")
-                if i == -1 {
-                        in = rest
-                        continue
-                }
-
-                if out, comment, err = parseAuthorizedKey(in[i:]); err == nil {
-                        return out, comment, options, rest, nil
-                }
-
-                // No key type recognised. Maybe there's an options field at
-                // the beginning.
-                var b byte
-                inQuote := false
-                var candidateOptions []string
-                optionStart := 0
-                for i, b = range in {
-                        isEnd := !inQuote && (b == ' ' || b == '\t')
-                        if (b == ',' && !inQuote) || isEnd {
-                                if i-optionStart > 0 {
-                                        candidateOptions = append(candidateOptions, string(in[optionStart:i]))
-                                }
-                                optionStart = i + 1
-                        }
-                        if isEnd {
-                                break
-                        }
-                        if b == '"' && (i == 0 || (i > 0 && in[i-1] != '\\')) {
-                                inQuote = !inQuote
-                        }
-                }
-                for i < len(in) && (in[i] == ' ' || in[i] == '\t') {
-                        i++
-                }
-                if i == len(in) {
-                        // Invalid line: unmatched quote
-                        in = rest
-                        continue
-                }
-
-                in = in[i:]
-                i = bytes.IndexAny(in, " \t")
-                if i == -1 {
-                        in = rest
-                        continue
-                }
-
-                if out, comment, err = parseAuthorizedKey(in[i:]); err == nil {
-                        options = candidateOptions
-                        return out, comment, options, rest, nil
-                }
-
-                in = rest
-                continue
-        }
-
-        return nil, "", nil, nil, errors.New("ssh: no key found")
-}
-
-// ParsePublicKey parses an SSH public key formatted for use in
-// the SSH wire protocol according to RFC 4253, section 6.6.
-func ParsePublicKey(in []byte) (out PublicKey, err error) {
-        algo, in, ok := parseString(in)
-        if !ok {
-                return nil, errShortRead
-        }
-        var rest []byte
-        out, rest, err = parsePubKey(in, string(algo))
-        if len(rest) > 0 {
-                return nil, errors.New("ssh: trailing junk in public key")
-        }
-
-        return out, err
-}
-
-// MarshalAuthorizedKey serializes key for inclusion in an OpenSSH
-// authorized_keys file. The return value ends with newline.
-func MarshalAuthorizedKey(key PublicKey) []byte {
-        b := &bytes.Buffer{}
-        b.WriteString(key.Type())
-        b.WriteByte(' ')
-        e := base64.NewEncoder(base64.StdEncoding, b)
-        e.Write(key.Marshal())
-        e.Close()
-        b.WriteByte('\n')
-        return b.Bytes()
-}
-
-// PublicKey is an abstraction of different types of public keys.
-type PublicKey interface {
-        // Type returns the key's type, e.g. "ssh-rsa".
-        Type() string
-
-        // Marshal returns the serialized key data in SSH wire format,
-        // with the name prefix.
-        Marshal() []byte
-
-        // Verify that sig is a signature on the given data using this
-        // key. This function will hash the data appropriately first.
-        Verify(data []byte, sig *Signature) error
-}
-
-// CryptoPublicKey, if implemented by a PublicKey,
-// returns the underlying crypto.PublicKey form of the key.
-type CryptoPublicKey interface {
-        CryptoPublicKey() crypto.PublicKey
-}
-
-// A Signer can create signatures that verify against a public key.
-type Signer interface {
-        // PublicKey returns an associated PublicKey instance.
-        PublicKey() PublicKey
-
-        // Sign returns raw signature for the given data. This method
-        // will apply the hash specified for the keytype to the data.
-        Sign(rand io.Reader, data []byte) (*Signature, error)
-}
-
-type rsaPublicKey rsa.PublicKey
-
-func (r *rsaPublicKey) Type() string {
-        return "ssh-rsa"
-}
-
-// parseRSA parses an RSA key according to RFC 4253, section 6.6.
-func parseRSA(in []byte) (out PublicKey, rest []byte, err error) {
-        var w struct {
-                E    *big.Int
-                N    *big.Int
-                Rest []byte `ssh:"rest"`
-        }
-        if err := Unmarshal(in, &w); err != nil {
-                return nil, nil, err
-        }
-
-        if w.E.BitLen() > 24 {
-                return nil, nil, errors.New("ssh: exponent too large")
-        }
-        e := w.E.Int64()
-        if e < 3 || e&1 == 0 {
-                return nil, nil, errors.New("ssh: incorrect exponent")
-        }
-
-        var key rsa.PublicKey
-        key.E = int(e)
-        key.N = w.N
-        return (*rsaPublicKey)(&key), w.Rest, nil
-}
-
-func (r *rsaPublicKey) Marshal() []byte {
-        e := new(big.Int).SetInt64(int64(r.E))
-        // RSA publickey struct layout should match the struct used by
-        // parseRSACert in the x/crypto/ssh/agent package.
-        wirekey := struct {
-                Name string
-                E    *big.Int
-                N    *big.Int
-        }{
-                KeyAlgoRSA,
-                e,
-                r.N,
-        }
-        return Marshal(&wirekey)
-}
-
-func (r *rsaPublicKey) Verify(data []byte, sig *Signature) error {
-        if sig.Format != r.Type() {
-                return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, r.Type())
-        }
-        h := crypto.SHA1.New()
-        h.Write(data)
-        digest := h.Sum(nil)
-        return rsa.VerifyPKCS1v15((*rsa.PublicKey)(r), crypto.SHA1, digest, sig.Blob)
-}
-
-func (r *rsaPublicKey) CryptoPublicKey() crypto.PublicKey {
-        return (*rsa.PublicKey)(r)
-}
-
-type dsaPublicKey dsa.PublicKey
-
-func (r *dsaPublicKey) Type() string {
-        return "ssh-dss"
-}
-
-// parseDSA parses an DSA key according to RFC 4253, section 6.6.
-func parseDSA(in []byte) (out PublicKey, rest []byte, err error) {
-        var w struct {
-                P, Q, G, Y *big.Int
-                Rest       []byte `ssh:"rest"`
-        }
-        if err := Unmarshal(in, &w); err != nil {
-                return nil, nil, err
-        }
-
-        key := &dsaPublicKey{
-                Parameters: dsa.Parameters{
-                        P: w.P,
-                        Q: w.Q,
-                        G: w.G,
-                },
-                Y: w.Y,
-        }
-        return key, w.Rest, nil
-}
-
-func (k *dsaPublicKey) Marshal() []byte {
-        // DSA publickey struct layout should match the struct used by
-        // parseDSACert in the x/crypto/ssh/agent package.
-        w := struct {
-                Name       string
-                P, Q, G, Y *big.Int
-        }{
-                k.Type(),
-                k.P,
-                k.Q,
-                k.G,
-                k.Y,
-        }
-
-        return Marshal(&w)
-}
-
-func (k *dsaPublicKey) Verify(data []byte, sig *Signature) error {
-        if sig.Format != k.Type() {
-                return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, k.Type())
-        }
-        h := crypto.SHA1.New()
-        h.Write(data)
-        digest := h.Sum(nil)
-
-        // Per RFC 4253, section 6.6,
-        // The value for 'dss_signature_blob' is encoded as a string containing
-        // r, followed by s (which are 160-bit integers, without lengths or
-        // padding, unsigned, and in network byte order).
-        // For DSS purposes, sig.Blob should be exactly 40 bytes in length.
-        if len(sig.Blob) != 40 {
-                return errors.New("ssh: DSA signature parse error")
-        }
-        r := new(big.Int).SetBytes(sig.Blob[:20])
-        s := new(big.Int).SetBytes(sig.Blob[20:])
-        if dsa.Verify((*dsa.PublicKey)(k), digest, r, s) {
-                return nil
-        }
-        return errors.New("ssh: signature did not verify")
-}
-
-func (k *dsaPublicKey) CryptoPublicKey() crypto.PublicKey {
-        return (*dsa.PublicKey)(k)
-}
-
-type dsaPrivateKey struct {
-        *dsa.PrivateKey
-}
-
-func (k *dsaPrivateKey) PublicKey() PublicKey {
-        return (*dsaPublicKey)(&k.PrivateKey.PublicKey)
-}
-
-func (k *dsaPrivateKey) Sign(rand io.Reader, data []byte) (*Signature, error) {
-        h := crypto.SHA1.New()
-        h.Write(data)
-        digest := h.Sum(nil)
-        r, s, err := dsa.Sign(rand, k.PrivateKey, digest)
-        if err != nil {
-                return nil, err
-        }
-
-        sig := make([]byte, 40)
-        rb := r.Bytes()
-        sb := s.Bytes()
-
-        copy(sig[20-len(rb):20], rb)
-        copy(sig[40-len(sb):], sb)
-
-        return &Signature{
-                Format: k.PublicKey().Type(),
-                Blob:   sig,
-        }, nil
-}
-
-type ecdsaPublicKey ecdsa.PublicKey
-
-func (key *ecdsaPublicKey) Type() string {
-        return "ecdsa-sha2-" + key.nistID()
-}
-
-func (key *ecdsaPublicKey) nistID() string {
-        switch key.Params().BitSize {
-        case 256:
-                return "nistp256"
-        case 384:
-                return "nistp384"
-        case 521:
-                return "nistp521"
-        }
-        panic("ssh: unsupported ecdsa key size")
-}
-
-type ed25519PublicKey ed25519.PublicKey
-
-func (key ed25519PublicKey) Type() string {
-        return KeyAlgoED25519
-}
-
-func parseED25519(in []byte) (out PublicKey, rest []byte, err error) {
-        var w struct {
-                KeyBytes []byte
-                Rest     []byte `ssh:"rest"`
-        }
-
-        if err := Unmarshal(in, &w); err != nil {
-                return nil, nil, err
-        }
-
-        key := ed25519.PublicKey(w.KeyBytes)
-
-        return (ed25519PublicKey)(key), w.Rest, nil
-}
-
-func (key ed25519PublicKey) Marshal() []byte {
-        w := struct {
-                Name     string
-                KeyBytes []byte
-        }{
-                KeyAlgoED25519,
-                []byte(key),
-        }
-        return Marshal(&w)
-}
-
-func (key ed25519PublicKey) Verify(b []byte, sig *Signature) error {
-        if sig.Format != key.Type() {
-                return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, key.Type())
-        }
-
-        edKey := (ed25519.PublicKey)(key)
-        if ok := ed25519.Verify(edKey, b, sig.Blob); !ok {
-                return errors.New("ssh: signature did not verify")
-        }
-
-        return nil
-}
-
-func (k ed25519PublicKey) CryptoPublicKey() crypto.PublicKey {
-        return ed25519.PublicKey(k)
-}
-
-func supportedEllipticCurve(curve elliptic.Curve) bool {
-        return curve == elliptic.P256() || curve == elliptic.P384() || curve == elliptic.P521()
-}
-
-// ecHash returns the hash to match the given elliptic curve, see RFC
-// 5656, section 6.2.1
-func ecHash(curve elliptic.Curve) crypto.Hash {
-        bitSize := curve.Params().BitSize
-        switch {
-        case bitSize <= 256:
-                return crypto.SHA256
-        case bitSize <= 384:
-                return crypto.SHA384
-        }
-        return crypto.SHA512
-}
-
-// parseECDSA parses an ECDSA key according to RFC 5656, section 3.1.
-func parseECDSA(in []byte) (out PublicKey, rest []byte, err error) {
-        var w struct {
-                Curve    string
-                KeyBytes []byte
-                Rest     []byte `ssh:"rest"`
-        }
-
-        if err := Unmarshal(in, &w); err != nil {
-                return nil, nil, err
-        }
-
-        key := new(ecdsa.PublicKey)
-
-        switch w.Curve {
-        case "nistp256":
-                key.Curve = elliptic.P256()
-        case "nistp384":
-                key.Curve = elliptic.P384()
-        case "nistp521":
-                key.Curve = elliptic.P521()
-        default:
-                return nil, nil, errors.New("ssh: unsupported curve")
-        }
-
-        key.X, key.Y = elliptic.Unmarshal(key.Curve, w.KeyBytes)
-        if key.X == nil || key.Y == nil {
-                return nil, nil, errors.New("ssh: invalid curve point")
-        }
-        return (*ecdsaPublicKey)(key), w.Rest, nil
-}
-
-func (key *ecdsaPublicKey) Marshal() []byte {
-        // See RFC 5656, section 3.1.
-        keyBytes := elliptic.Marshal(key.Curve, key.X, key.Y)
-        // ECDSA publickey struct layout should match the struct used by
-        // parseECDSACert in the x/crypto/ssh/agent package.
-        w := struct {
-                Name string
-                ID   string
-                Key  []byte
-        }{
-                key.Type(),
-                key.nistID(),
-                keyBytes,
-        }
-
-        return Marshal(&w)
-}
-
-func (key *ecdsaPublicKey) Verify(data []byte, sig *Signature) error {
-        if sig.Format != key.Type() {
-                return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, key.Type())
-        }
-
-        h := ecHash(key.Curve).New()
-        h.Write(data)
-        digest := h.Sum(nil)
-
-        // Per RFC 5656, section 3.1.2,
-        // The ecdsa_signature_blob value has the following specific encoding:
-        //    mpint    r
-        //    mpint    s
-        var ecSig struct {
-                R *big.Int
-                S *big.Int
-        }
-
-        if err := Unmarshal(sig.Blob, &ecSig); err != nil {
-                return err
-        }
-
-        if ecdsa.Verify((*ecdsa.PublicKey)(key), digest, ecSig.R, ecSig.S) {
-                return nil
-        }
-        return errors.New("ssh: signature did not verify")
-}
-
-func (k *ecdsaPublicKey) CryptoPublicKey() crypto.PublicKey {
-        return (*ecdsa.PublicKey)(k)
-}
-
-// NewSignerFromKey takes an *rsa.PrivateKey, *dsa.PrivateKey,
-// *ecdsa.PrivateKey or any other crypto.Signer and returns a corresponding
-// Signer instance. ECDSA keys must use P-256, P-384 or P-521.
-func NewSignerFromKey(key interface{}) (Signer, error) {
-        switch key := key.(type) {
-        case crypto.Signer:
-                return NewSignerFromSigner(key)
-        case *dsa.PrivateKey:
-                return &dsaPrivateKey{key}, nil
-        default:
-                return nil, fmt.Errorf("ssh: unsupported key type %T", key)
-        }
-}
-
-type wrappedSigner struct {
-        signer crypto.Signer
-        pubKey PublicKey
-}
-
-// NewSignerFromSigner takes any crypto.Signer implementation and
-// returns a corresponding Signer interface. This can be used, for
-// example, with keys kept in hardware modules.
-func NewSignerFromSigner(signer crypto.Signer) (Signer, error) {
-        pubKey, err := NewPublicKey(signer.Public())
-        if err != nil {
-                return nil, err
-        }
-
-        return &wrappedSigner{signer, pubKey}, nil
-}
-
-func (s *wrappedSigner) PublicKey() PublicKey {
-        return s.pubKey
-}
-
-func (s *wrappedSigner) Sign(rand io.Reader, data []byte) (*Signature, error) {
-        var hashFunc crypto.Hash
-
-        switch key := s.pubKey.(type) {
-        case *rsaPublicKey, *dsaPublicKey:
-                hashFunc = crypto.SHA1
-        case *ecdsaPublicKey:
-                hashFunc = ecHash(key.Curve)
-        case ed25519PublicKey:
-        default:
-                return nil, fmt.Errorf("ssh: unsupported key type %T", key)
-        }
-
-        var digest []byte
-        if hashFunc != 0 {
-                h := hashFunc.New()
-                h.Write(data)
-                digest = h.Sum(nil)
-        } else {
-                digest = data
-        }
-
-        signature, err := s.signer.Sign(rand, digest, hashFunc)
-        if err != nil {
-                return nil, err
-        }
-
-        // crypto.Signer.Sign is expected to return an ASN.1-encoded signature
-        // for ECDSA and DSA, but that's not the encoding expected by SSH, so
-        // re-encode.
-        switch s.pubKey.(type) {
-        case *ecdsaPublicKey, *dsaPublicKey:
-                type asn1Signature struct {
-                        R, S *big.Int
-                }
-                asn1Sig := new(asn1Signature)
-                _, err := asn1.Unmarshal(signature, asn1Sig)
-                if err != nil {
-                        return nil, err
-                }
-
-                switch s.pubKey.(type) {
-                case *ecdsaPublicKey:
-                        signature = Marshal(asn1Sig)
-
-                case *dsaPublicKey:
-                        signature = make([]byte, 40)
-                        r := asn1Sig.R.Bytes()
-                        s := asn1Sig.S.Bytes()
-                        copy(signature[20-len(r):20], r)
-                        copy(signature[40-len(s):40], s)
-                }
-        }
-
-        return &Signature{
-                Format: s.pubKey.Type(),
-                Blob:   signature,
-        }, nil
-}
-
-// NewPublicKey takes an *rsa.PublicKey, *dsa.PublicKey, *ecdsa.PublicKey,
-// or ed25519.PublicKey returns a corresponding PublicKey instance.
-// ECDSA keys must use P-256, P-384 or P-521.
-func NewPublicKey(key interface{}) (PublicKey, error) {
-        switch key := key.(type) {
-        case *rsa.PublicKey:
-                return (*rsaPublicKey)(key), nil
-        case *ecdsa.PublicKey:
-                if !supportedEllipticCurve(key.Curve) {
-                        return nil, errors.New("ssh: only P-256, P-384 and P-521 EC keys are supported.")
-                }
-                return (*ecdsaPublicKey)(key), nil
-        case *dsa.PublicKey:
-                return (*dsaPublicKey)(key), nil
-        case ed25519.PublicKey:
-                return (ed25519PublicKey)(key), nil
-        default:
-                return nil, fmt.Errorf("ssh: unsupported key type %T", key)
-        }
-}
-
-// ParsePrivateKey returns a Signer from a PEM encoded private key. It supports
-// the same keys as ParseRawPrivateKey.
-func ParsePrivateKey(pemBytes []byte) (Signer, error) {
-        key, err := ParseRawPrivateKey(pemBytes)
-        if err != nil {
-                return nil, err
-        }
-
-        return NewSignerFromKey(key)
-}
-
-// encryptedBlock tells whether a private key is
-// encrypted by examining its Proc-Type header
-// for a mention of ENCRYPTED
-// according to RFC 1421 Section 4.6.1.1.
-func encryptedBlock(block *pem.Block) bool {
-        return strings.Contains(block.Headers["Proc-Type"], "ENCRYPTED")
-}
-
-// ParseRawPrivateKey returns a private key from a PEM encoded private key. It
-// supports RSA (PKCS#1), DSA (OpenSSL), and ECDSA private keys.
-func ParseRawPrivateKey(pemBytes []byte) (interface{}, error) {
-        block, _ := pem.Decode(pemBytes)
-        if block == nil {
-                return nil, errors.New("ssh: no key found")
-        }
-
-        if encryptedBlock(block) {
-                return nil, errors.New("ssh: cannot decode encrypted private keys")
-        }
-
-        switch block.Type {
-        case "RSA PRIVATE KEY":
-                return x509.ParsePKCS1PrivateKey(block.Bytes)
-        case "EC PRIVATE KEY":
-                return x509.ParseECPrivateKey(block.Bytes)
-        case "DSA PRIVATE KEY":
-                return ParseDSAPrivateKey(block.Bytes)
-        case "OPENSSH PRIVATE KEY":
-                return parseOpenSSHPrivateKey(block.Bytes)
-        default:
-                return nil, fmt.Errorf("ssh: unsupported key type %q", block.Type)
-        }
-}
-
-// ParseDSAPrivateKey returns a DSA private key from its ASN.1 DER encoding, as
-// specified by the OpenSSL DSA man page.
-func ParseDSAPrivateKey(der []byte) (*dsa.PrivateKey, error) {
-        var k struct {
-                Version int
-                P       *big.Int
-                Q       *big.Int
-                G       *big.Int
-                Pub     *big.Int
-                Priv    *big.Int
-        }
-        rest, err := asn1.Unmarshal(der, &k)
-        if err != nil {
-                return nil, errors.New("ssh: failed to parse DSA key: " + err.Error())
-        }
-        if len(rest) > 0 {
-                return nil, errors.New("ssh: garbage after DSA key")
-        }
-
-        return &dsa.PrivateKey{
-                PublicKey: dsa.PublicKey{
-                        Parameters: dsa.Parameters{
-                                P: k.P,
-                                Q: k.Q,
-                                G: k.G,
-                        },
-                        Y: k.Pub,
-                },
-                X: k.Priv,
-        }, nil
-}
-
-// Implemented based on the documentation at
-// https://github.com/openssh/openssh-portable/blob/master/PROTOCOL.key
-func parseOpenSSHPrivateKey(key []byte) (*ed25519.PrivateKey, error) {
-        magic := append([]byte("openssh-key-v1"), 0)
-        if !bytes.Equal(magic, key[0:len(magic)]) {
-                return nil, errors.New("ssh: invalid openssh private key format")
-        }
-        remaining := key[len(magic):]
-
-        var w struct {
-                CipherName   string
-                KdfName      string
-                KdfOpts      string
-                NumKeys      uint32
-                PubKey       []byte
-                PrivKeyBlock []byte
-        }
-
-        if err := Unmarshal(remaining, &w); err != nil {
-                return nil, err
-        }
-
-        pk1 := struct {
-                Check1  uint32
-                Check2  uint32
-                Keytype string
-                Pub     []byte
-                Priv    []byte
-                Comment string
-                Pad     []byte `ssh:"rest"`
-        }{}
-
-        if err := Unmarshal(w.PrivKeyBlock, &pk1); err != nil {
-                return nil, err
-        }
-
-        if pk1.Check1 != pk1.Check2 {
-                return nil, errors.New("ssh: checkint mismatch")
-        }
-
-        // we only handle ed25519 keys currently
-        if pk1.Keytype != KeyAlgoED25519 {
-                return nil, errors.New("ssh: unhandled key type")
-        }
-
-        for i, b := range pk1.Pad {
-                if int(b) != i+1 {
-                        return nil, errors.New("ssh: padding not as expected")
-                }
-        }
-
-        if len(pk1.Priv) != ed25519.PrivateKeySize {
-                return nil, errors.New("ssh: private key unexpected length")
-        }
-
-        pk := ed25519.PrivateKey(make([]byte, ed25519.PrivateKeySize))
-        copy(pk, pk1.Priv)
-        return &pk, nil
-}
-
-// FingerprintLegacyMD5 returns the user presentation of the key's
-// fingerprint as described by RFC 4716 section 4.
-func FingerprintLegacyMD5(pubKey PublicKey) string {
-        md5sum := md5.Sum(pubKey.Marshal())
-        hexarray := make([]string, len(md5sum))
-        for i, c := range md5sum {
-                hexarray[i] = hex.EncodeToString([]byte{c})
-        }
-        return strings.Join(hexarray, ":")
-}
-
-// FingerprintSHA256 returns the user presentation of the key's
-// fingerprint as unpadded base64 encoded sha256 hash.
-// This format was introduced from OpenSSH 6.8.
-// https://www.openssh.com/txt/release-6.8
-// https://tools.ietf.org/html/rfc4648#section-3.2 (unpadded base64 encoding)
-func FingerprintSHA256(pubKey PublicKey) string {
-        sha256sum := sha256.Sum256(pubKey.Marshal())
-        hash := base64.RawStdEncoding.EncodeToString(sha256sum[:])
-        return "SHA256:" + hash
-}
diff --git a/vendor/golang.org/x/crypto/ssh/mac.go b/vendor/golang.org/x/crypto/ssh/mac.go
deleted file mode 100644
index c07a062..0000000
--- a/vendor/golang.org/x/crypto/ssh/mac.go
+++ /dev/null
@@ -1,61 +0,0 @@
-// 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 ssh
-
-// Message authentication support
-
-import (
-        "crypto/hmac"
-        "crypto/sha1"
-        "crypto/sha256"
-        "hash"
-)
-
-type macMode struct {
-        keySize int
-        etm     bool
-        new     func(key []byte) hash.Hash
-}
-
-// truncatingMAC wraps around a hash.Hash and truncates the output digest to
-// a given size.
-type truncatingMAC struct {
-        length int
-        hmac   hash.Hash
-}
-
-func (t truncatingMAC) Write(data []byte) (int, error) {
-        return t.hmac.Write(data)
-}
-
-func (t truncatingMAC) Sum(in []byte) []byte {
-        out := t.hmac.Sum(in)
-        return out[:len(in)+t.length]
-}
-
-func (t truncatingMAC) Reset() {
-        t.hmac.Reset()
-}
-
-func (t truncatingMAC) Size() int {
-        return t.length
-}
-
-func (t truncatingMAC) BlockSize() int { return t.hmac.BlockSize() }
-
-var macModes = map[string]*macMode{
-        "hmac-sha2-256-etm@openssh.com": {32, true, func(key []byte) hash.Hash {
-                return hmac.New(sha256.New, key)
-        }},
-        "hmac-sha2-256": {32, false, func(key []byte) hash.Hash {
-                return hmac.New(sha256.New, key)
-        }},
-        "hmac-sha1": {20, false, func(key []byte) hash.Hash {
-                return hmac.New(sha1.New, key)
-        }},
-        "hmac-sha1-96": {20, false, func(key []byte) hash.Hash {
-                return truncatingMAC{12, hmac.New(sha1.New, key)}
-        }},
-}
diff --git a/vendor/golang.org/x/crypto/ssh/messages.go b/vendor/golang.org/x/crypto/ssh/messages.go
deleted file mode 100644
index e6ecd3a..0000000
--- a/vendor/golang.org/x/crypto/ssh/messages.go
+++ /dev/null
@@ -1,758 +0,0 @@
-// 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 ssh
-
-import (
-        "bytes"
-        "encoding/binary"
-        "errors"
-        "fmt"
-        "io"
-        "math/big"
-        "reflect"
-        "strconv"
-        "strings"
-)
-
-// These are SSH message type numbers. They are scattered around several
-// documents but many were taken from [SSH-PARAMETERS].
-const (
-        msgIgnore        = 2
-        msgUnimplemented = 3
-        msgDebug         = 4
-        msgNewKeys       = 21
-
-        // Standard authentication messages
-        msgUserAuthSuccess = 52
-        msgUserAuthBanner  = 53
-)
-
-// SSH messages:
-//
-// These structures mirror the wire format of the corresponding SSH messages.
-// They are marshaled using reflection with the marshal and unmarshal functions
-// in this file. The only wrinkle is that a final member of type []byte with a
-// ssh tag of "rest" receives the remainder of a packet when unmarshaling.
-
-// See RFC 4253, section 11.1.
-const msgDisconnect = 1
-
-// disconnectMsg is the message that signals a disconnect. It is also
-// the error type returned from mux.Wait()
-type disconnectMsg struct {
-        Reason   uint32 `sshtype:"1"`
-        Message  string
-        Language string
-}
-
-func (d *disconnectMsg) Error() string {
-        return fmt.Sprintf("ssh: disconnect, reason %d: %s", d.Reason, d.Message)
-}
-
-// See RFC 4253, section 7.1.
-const msgKexInit = 20
-
-type kexInitMsg struct {
-        Cookie                  [16]byte `sshtype:"20"`
-        KexAlgos                []string
-        ServerHostKeyAlgos      []string
-        CiphersClientServer     []string
-        CiphersServerClient     []string
-        MACsClientServer        []string
-        MACsServerClient        []string
-        CompressionClientServer []string
-        CompressionServerClient []string
-        LanguagesClientServer   []string
-        LanguagesServerClient   []string
-        FirstKexFollows         bool
-        Reserved                uint32
-}
-
-// See RFC 4253, section 8.
-
-// Diffie-Helman
-const msgKexDHInit = 30
-
-type kexDHInitMsg struct {
-        X *big.Int `sshtype:"30"`
-}
-
-const msgKexECDHInit = 30
-
-type kexECDHInitMsg struct {
-        ClientPubKey []byte `sshtype:"30"`
-}
-
-const msgKexECDHReply = 31
-
-type kexECDHReplyMsg struct {
-        HostKey         []byte `sshtype:"31"`
-        EphemeralPubKey []byte
-        Signature       []byte
-}
-
-const msgKexDHReply = 31
-
-type kexDHReplyMsg struct {
-        HostKey   []byte `sshtype:"31"`
-        Y         *big.Int
-        Signature []byte
-}
-
-// See RFC 4253, section 10.
-const msgServiceRequest = 5
-
-type serviceRequestMsg struct {
-        Service string `sshtype:"5"`
-}
-
-// See RFC 4253, section 10.
-const msgServiceAccept = 6
-
-type serviceAcceptMsg struct {
-        Service string `sshtype:"6"`
-}
-
-// See RFC 4252, section 5.
-const msgUserAuthRequest = 50
-
-type userAuthRequestMsg struct {
-        User    string `sshtype:"50"`
-        Service string
-        Method  string
-        Payload []byte `ssh:"rest"`
-}
-
-// Used for debug printouts of packets.
-type userAuthSuccessMsg struct {
-}
-
-// See RFC 4252, section 5.1
-const msgUserAuthFailure = 51
-
-type userAuthFailureMsg struct {
-        Methods        []string `sshtype:"51"`
-        PartialSuccess bool
-}
-
-// See RFC 4256, section 3.2
-const msgUserAuthInfoRequest = 60
-const msgUserAuthInfoResponse = 61
-
-type userAuthInfoRequestMsg struct {
-        User               string `sshtype:"60"`
-        Instruction        string
-        DeprecatedLanguage string
-        NumPrompts         uint32
-        Prompts            []byte `ssh:"rest"`
-}
-
-// See RFC 4254, section 5.1.
-const msgChannelOpen = 90
-
-type channelOpenMsg struct {
-        ChanType         string `sshtype:"90"`
-        PeersId          uint32
-        PeersWindow      uint32
-        MaxPacketSize    uint32
-        TypeSpecificData []byte `ssh:"rest"`
-}
-
-const msgChannelExtendedData = 95
-const msgChannelData = 94
-
-// Used for debug print outs of packets.
-type channelDataMsg struct {
-        PeersId uint32 `sshtype:"94"`
-        Length  uint32
-        Rest    []byte `ssh:"rest"`
-}
-
-// See RFC 4254, section 5.1.
-const msgChannelOpenConfirm = 91
-
-type channelOpenConfirmMsg struct {
-        PeersId          uint32 `sshtype:"91"`
-        MyId             uint32
-        MyWindow         uint32
-        MaxPacketSize    uint32
-        TypeSpecificData []byte `ssh:"rest"`
-}
-
-// See RFC 4254, section 5.1.
-const msgChannelOpenFailure = 92
-
-type channelOpenFailureMsg struct {
-        PeersId  uint32 `sshtype:"92"`
-        Reason   RejectionReason
-        Message  string
-        Language string
-}
-
-const msgChannelRequest = 98
-
-type channelRequestMsg struct {
-        PeersId             uint32 `sshtype:"98"`
-        Request             string
-        WantReply           bool
-        RequestSpecificData []byte `ssh:"rest"`
-}
-
-// See RFC 4254, section 5.4.
-const msgChannelSuccess = 99
-
-type channelRequestSuccessMsg struct {
-        PeersId uint32 `sshtype:"99"`
-}
-
-// See RFC 4254, section 5.4.
-const msgChannelFailure = 100
-
-type channelRequestFailureMsg struct {
-        PeersId uint32 `sshtype:"100"`
-}
-
-// See RFC 4254, section 5.3
-const msgChannelClose = 97
-
-type channelCloseMsg struct {
-        PeersId uint32 `sshtype:"97"`
-}
-
-// See RFC 4254, section 5.3
-const msgChannelEOF = 96
-
-type channelEOFMsg struct {
-        PeersId uint32 `sshtype:"96"`
-}
-
-// See RFC 4254, section 4
-const msgGlobalRequest = 80
-
-type globalRequestMsg struct {
-        Type      string `sshtype:"80"`
-        WantReply bool
-        Data      []byte `ssh:"rest"`
-}
-
-// See RFC 4254, section 4
-const msgRequestSuccess = 81
-
-type globalRequestSuccessMsg struct {
-        Data []byte `ssh:"rest" sshtype:"81"`
-}
-
-// See RFC 4254, section 4
-const msgRequestFailure = 82
-
-type globalRequestFailureMsg struct {
-        Data []byte `ssh:"rest" sshtype:"82"`
-}
-
-// See RFC 4254, section 5.2
-const msgChannelWindowAdjust = 93
-
-type windowAdjustMsg struct {
-        PeersId         uint32 `sshtype:"93"`
-        AdditionalBytes uint32
-}
-
-// See RFC 4252, section 7
-const msgUserAuthPubKeyOk = 60
-
-type userAuthPubKeyOkMsg struct {
-        Algo   string `sshtype:"60"`
-        PubKey []byte
-}
-
-// typeTags returns the possible type bytes for the given reflect.Type, which
-// should be a struct. The possible values are separated by a '|' character.
-func typeTags(structType reflect.Type) (tags []byte) {
-        tagStr := structType.Field(0).Tag.Get("sshtype")
-
-        for _, tag := range strings.Split(tagStr, "|") {
-                i, err := strconv.Atoi(tag)
-                if err == nil {
-                        tags = append(tags, byte(i))
-                }
-        }
-
-        return tags
-}
-
-func fieldError(t reflect.Type, field int, problem string) error {
-        if problem != "" {
-                problem = ": " + problem
-        }
-        return fmt.Errorf("ssh: unmarshal error for field %s of type %s%s", t.Field(field).Name, t.Name(), problem)
-}
-
-var errShortRead = errors.New("ssh: short read")
-
-// Unmarshal parses data in SSH wire format into a structure. The out
-// argument should be a pointer to struct. If the first member of the
-// struct has the "sshtype" tag set to a '|'-separated set of numbers
-// in decimal, the packet must start with one of those numbers. In
-// case of error, Unmarshal returns a ParseError or
-// UnexpectedMessageError.
-func Unmarshal(data []byte, out interface{}) error {
-        v := reflect.ValueOf(out).Elem()
-        structType := v.Type()
-        expectedTypes := typeTags(structType)
-
-        var expectedType byte
-        if len(expectedTypes) > 0 {
-                expectedType = expectedTypes[0]
-        }
-
-        if len(data) == 0 {
-                return parseError(expectedType)
-        }
-
-        if len(expectedTypes) > 0 {
-                goodType := false
-                for _, e := range expectedTypes {
-                        if e > 0 && data[0] == e {
-                                goodType = true
-                                break
-                        }
-                }
-                if !goodType {
-                        return fmt.Errorf("ssh: unexpected message type %d (expected one of %v)", data[0], expectedTypes)
-                }
-                data = data[1:]
-        }
-
-        var ok bool
-        for i := 0; i < v.NumField(); i++ {
-                field := v.Field(i)
-                t := field.Type()
-                switch t.Kind() {
-                case reflect.Bool:
-                        if len(data) < 1 {
-                                return errShortRead
-                        }
-                        field.SetBool(data[0] != 0)
-                        data = data[1:]
-                case reflect.Array:
-                        if t.Elem().Kind() != reflect.Uint8 {
-                                return fieldError(structType, i, "array of unsupported type")
-                        }
-                        if len(data) < t.Len() {
-                                return errShortRead
-                        }
-                        for j, n := 0, t.Len(); j < n; j++ {
-                                field.Index(j).Set(reflect.ValueOf(data[j]))
-                        }
-                        data = data[t.Len():]
-                case reflect.Uint64:
-                        var u64 uint64
-                        if u64, data, ok = parseUint64(data); !ok {
-                                return errShortRead
-                        }
-                        field.SetUint(u64)
-                case reflect.Uint32:
-                        var u32 uint32
-                        if u32, data, ok = parseUint32(data); !ok {
-                                return errShortRead
-                        }
-                        field.SetUint(uint64(u32))
-                case reflect.Uint8:
-                        if len(data) < 1 {
-                                return errShortRead
-                        }
-                        field.SetUint(uint64(data[0]))
-                        data = data[1:]
-                case reflect.String:
-                        var s []byte
-                        if s, data, ok = parseString(data); !ok {
-                                return fieldError(structType, i, "")
-                        }
-                        field.SetString(string(s))
-                case reflect.Slice:
-                        switch t.Elem().Kind() {
-                        case reflect.Uint8:
-                                if structType.Field(i).Tag.Get("ssh") == "rest" {
-                                        field.Set(reflect.ValueOf(data))
-                                        data = nil
-                                } else {
-                                        var s []byte
-                                        if s, data, ok = parseString(data); !ok {
-                                                return errShortRead
-                                        }
-                                        field.Set(reflect.ValueOf(s))
-                                }
-                        case reflect.String:
-                                var nl []string
-                                if nl, data, ok = parseNameList(data); !ok {
-                                        return errShortRead
-                                }
-                                field.Set(reflect.ValueOf(nl))
-                        default:
-                                return fieldError(structType, i, "slice of unsupported type")
-                        }
-                case reflect.Ptr:
-                        if t == bigIntType {
-                                var n *big.Int
-                                if n, data, ok = parseInt(data); !ok {
-                                        return errShortRead
-                                }
-                                field.Set(reflect.ValueOf(n))
-                        } else {
-                                return fieldError(structType, i, "pointer to unsupported type")
-                        }
-                default:
-                        return fieldError(structType, i, fmt.Sprintf("unsupported type: %v", t))
-                }
-        }
-
-        if len(data) != 0 {
-                return parseError(expectedType)
-        }
-
-        return nil
-}
-
-// Marshal serializes the message in msg to SSH wire format.  The msg
-// argument should be a struct or pointer to struct. If the first
-// member has the "sshtype" tag set to a number in decimal, that
-// number is prepended to the result. If the last of member has the
-// "ssh" tag set to "rest", its contents are appended to the output.
-func Marshal(msg interface{}) []byte {
-        out := make([]byte, 0, 64)
-        return marshalStruct(out, msg)
-}
-
-func marshalStruct(out []byte, msg interface{}) []byte {
-        v := reflect.Indirect(reflect.ValueOf(msg))
-        msgTypes := typeTags(v.Type())
-        if len(msgTypes) > 0 {
-                out = append(out, msgTypes[0])
-        }
-
-        for i, n := 0, v.NumField(); i < n; i++ {
-                field := v.Field(i)
-                switch t := field.Type(); t.Kind() {
-                case reflect.Bool:
-                        var v uint8
-                        if field.Bool() {
-                                v = 1
-                        }
-                        out = append(out, v)
-                case reflect.Array:
-                        if t.Elem().Kind() != reflect.Uint8 {
-                                panic(fmt.Sprintf("array of non-uint8 in field %d: %T", i, field.Interface()))
-                        }
-                        for j, l := 0, t.Len(); j < l; j++ {
-                                out = append(out, uint8(field.Index(j).Uint()))
-                        }
-                case reflect.Uint32:
-                        out = appendU32(out, uint32(field.Uint()))
-                case reflect.Uint64:
-                        out = appendU64(out, uint64(field.Uint()))
-                case reflect.Uint8:
-                        out = append(out, uint8(field.Uint()))
-                case reflect.String:
-                        s := field.String()
-                        out = appendInt(out, len(s))
-                        out = append(out, s...)
-                case reflect.Slice:
-                        switch t.Elem().Kind() {
-                        case reflect.Uint8:
-                                if v.Type().Field(i).Tag.Get("ssh") != "rest" {
-                                        out = appendInt(out, field.Len())
-                                }
-                                out = append(out, field.Bytes()...)
-                        case reflect.String:
-                                offset := len(out)
-                                out = appendU32(out, 0)
-                                if n := field.Len(); n > 0 {
-                                        for j := 0; j < n; j++ {
-                                                f := field.Index(j)
-                                                if j != 0 {
-                                                        out = append(out, ',')
-                                                }
-                                                out = append(out, f.String()...)
-                                        }
-                                        // overwrite length value
-                                        binary.BigEndian.PutUint32(out[offset:], uint32(len(out)-offset-4))
-                                }
-                        default:
-                                panic(fmt.Sprintf("slice of unknown type in field %d: %T", i, field.Interface()))
-                        }
-                case reflect.Ptr:
-                        if t == bigIntType {
-                                var n *big.Int
-                                nValue := reflect.ValueOf(&n)
-                                nValue.Elem().Set(field)
-                                needed := intLength(n)
-                                oldLength := len(out)
-
-                                if cap(out)-len(out) < needed {
-                                        newOut := make([]byte, len(out), 2*(len(out)+needed))
-                                        copy(newOut, out)
-                                        out = newOut
-                                }
-                                out = out[:oldLength+needed]
-                                marshalInt(out[oldLength:], n)
-                        } else {
-                                panic(fmt.Sprintf("pointer to unknown type in field %d: %T", i, field.Interface()))
-                        }
-                }
-        }
-
-        return out
-}
-
-var bigOne = big.NewInt(1)
-
-func parseString(in []byte) (out, rest []byte, ok bool) {
-        if len(in) < 4 {
-                return
-        }
-        length := binary.BigEndian.Uint32(in)
-        in = in[4:]
-        if uint32(len(in)) < length {
-                return
-        }
-        out = in[:length]
-        rest = in[length:]
-        ok = true
-        return
-}
-
-var (
-        comma         = []byte{','}
-        emptyNameList = []string{}
-)
-
-func parseNameList(in []byte) (out []string, rest []byte, ok bool) {
-        contents, rest, ok := parseString(in)
-        if !ok {
-                return
-        }
-        if len(contents) == 0 {
-                out = emptyNameList
-                return
-        }
-        parts := bytes.Split(contents, comma)
-        out = make([]string, len(parts))
-        for i, part := range parts {
-                out[i] = string(part)
-        }
-        return
-}
-
-func parseInt(in []byte) (out *big.Int, rest []byte, ok bool) {
-        contents, rest, ok := parseString(in)
-        if !ok {
-                return
-        }
-        out = new(big.Int)
-
-        if len(contents) > 0 && contents[0]&0x80 == 0x80 {
-                // This is a negative number
-                notBytes := make([]byte, len(contents))
-                for i := range notBytes {
-                        notBytes[i] = ^contents[i]
-                }
-                out.SetBytes(notBytes)
-                out.Add(out, bigOne)
-                out.Neg(out)
-        } else {
-                // Positive number
-                out.SetBytes(contents)
-        }
-        ok = true
-        return
-}
-
-func parseUint32(in []byte) (uint32, []byte, bool) {
-        if len(in) < 4 {
-                return 0, nil, false
-        }
-        return binary.BigEndian.Uint32(in), in[4:], true
-}
-
-func parseUint64(in []byte) (uint64, []byte, bool) {
-        if len(in) < 8 {
-                return 0, nil, false
-        }
-        return binary.BigEndian.Uint64(in), in[8:], true
-}
-
-func intLength(n *big.Int) int {
-        length := 4 /* length bytes */
-        if n.Sign() < 0 {
-                nMinus1 := new(big.Int).Neg(n)
-                nMinus1.Sub(nMinus1, bigOne)
-                bitLen := nMinus1.BitLen()
-                if bitLen%8 == 0 {
-                        // The number will need 0xff padding
-                        length++
-                }
-                length += (bitLen + 7) / 8
-        } else if n.Sign() == 0 {
-                // A zero is the zero length string
-        } else {
-                bitLen := n.BitLen()
-                if bitLen%8 == 0 {
-                        // The number will need 0x00 padding
-                        length++
-                }
-                length += (bitLen + 7) / 8
-        }
-
-        return length
-}
-
-func marshalUint32(to []byte, n uint32) []byte {
-        binary.BigEndian.PutUint32(to, n)
-        return to[4:]
-}
-
-func marshalUint64(to []byte, n uint64) []byte {
-        binary.BigEndian.PutUint64(to, n)
-        return to[8:]
-}
-
-func marshalInt(to []byte, n *big.Int) []byte {
-        lengthBytes := to
-        to = to[4:]
-        length := 0
-
-        if n.Sign() < 0 {
-                // A negative number has to be converted to two's-complement
-                // form. So we'll subtract 1 and invert. If the
-                // most-significant-bit isn't set then we'll need to pad the
-                // beginning with 0xff in order to keep the number negative.
-                nMinus1 := new(big.Int).Neg(n)
-                nMinus1.Sub(nMinus1, bigOne)
-                bytes := nMinus1.Bytes()
-                for i := range bytes {
-                        bytes[i] ^= 0xff
-                }
-                if len(bytes) == 0 || bytes[0]&0x80 == 0 {
-                        to[0] = 0xff
-                        to = to[1:]
-                        length++
-                }
-                nBytes := copy(to, bytes)
-                to = to[nBytes:]
-                length += nBytes
-        } else if n.Sign() == 0 {
-                // A zero is the zero length string
-        } else {
-                bytes := n.Bytes()
-                if len(bytes) > 0 && bytes[0]&0x80 != 0 {
-                        // We'll have to pad this with a 0x00 in order to
-                        // stop it looking like a negative number.
-                        to[0] = 0
-                        to = to[1:]
-                        length++
-                }
-                nBytes := copy(to, bytes)
-                to = to[nBytes:]
-                length += nBytes
-        }
-
-        lengthBytes[0] = byte(length >> 24)
-        lengthBytes[1] = byte(length >> 16)
-        lengthBytes[2] = byte(length >> 8)
-        lengthBytes[3] = byte(length)
-        return to
-}
-
-func writeInt(w io.Writer, n *big.Int) {
-        length := intLength(n)
-        buf := make([]byte, length)
-        marshalInt(buf, n)
-        w.Write(buf)
-}
-
-func writeString(w io.Writer, s []byte) {
-        var lengthBytes [4]byte
-        lengthBytes[0] = byte(len(s) >> 24)
-        lengthBytes[1] = byte(len(s) >> 16)
-        lengthBytes[2] = byte(len(s) >> 8)
-        lengthBytes[3] = byte(len(s))
-        w.Write(lengthBytes[:])
-        w.Write(s)
-}
-
-func stringLength(n int) int {
-        return 4 + n
-}
-
-func marshalString(to []byte, s []byte) []byte {
-        to[0] = byte(len(s) >> 24)
-        to[1] = byte(len(s) >> 16)
-        to[2] = byte(len(s) >> 8)
-        to[3] = byte(len(s))
-        to = to[4:]
-        copy(to, s)
-        return to[len(s):]
-}
-
-var bigIntType = reflect.TypeOf((*big.Int)(nil))
-
-// Decode a packet into its corresponding message.
-func decode(packet []byte) (interface{}, error) {
-        var msg interface{}
-        switch packet[0] {
-        case msgDisconnect:
-                msg = new(disconnectMsg)
-        case msgServiceRequest:
-                msg = new(serviceRequestMsg)
-        case msgServiceAccept:
-                msg = new(serviceAcceptMsg)
-        case msgKexInit:
-                msg = new(kexInitMsg)
-        case msgKexDHInit:
-                msg = new(kexDHInitMsg)
-        case msgKexDHReply:
-                msg = new(kexDHReplyMsg)
-        case msgUserAuthRequest:
-                msg = new(userAuthRequestMsg)
-        case msgUserAuthSuccess:
-                return new(userAuthSuccessMsg), nil
-        case msgUserAuthFailure:
-                msg = new(userAuthFailureMsg)
-        case msgUserAuthPubKeyOk:
-                msg = new(userAuthPubKeyOkMsg)
-        case msgGlobalRequest:
-                msg = new(globalRequestMsg)
-        case msgRequestSuccess:
-                msg = new(globalRequestSuccessMsg)
-        case msgRequestFailure:
-                msg = new(globalRequestFailureMsg)
-        case msgChannelOpen:
-                msg = new(channelOpenMsg)
-        case msgChannelData:
-                msg = new(channelDataMsg)
-        case msgChannelOpenConfirm:
-                msg = new(channelOpenConfirmMsg)
-        case msgChannelOpenFailure:
-                msg = new(channelOpenFailureMsg)
-        case msgChannelWindowAdjust:
-                msg = new(windowAdjustMsg)
-        case msgChannelEOF:
-                msg = new(channelEOFMsg)
-        case msgChannelClose:
-                msg = new(channelCloseMsg)
-        case msgChannelRequest:
-                msg = new(channelRequestMsg)
-        case msgChannelSuccess:
-                msg = new(channelRequestSuccessMsg)
-        case msgChannelFailure:
-                msg = new(channelRequestFailureMsg)
-        default:
-                return nil, unexpectedMessageError(0, packet[0])
-        }
-        if err := Unmarshal(packet, msg); err != nil {
-                return nil, err
-        }
-        return msg, nil
-}
diff --git a/vendor/golang.org/x/crypto/ssh/mux.go b/vendor/golang.org/x/crypto/ssh/mux.go
deleted file mode 100644
index 27a527c..0000000
--- a/vendor/golang.org/x/crypto/ssh/mux.go
+++ /dev/null
@@ -1,330 +0,0 @@
-// 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 ssh
-
-import (
-        "encoding/binary"
-        "fmt"
-        "io"
-        "log"
-        "sync"
-        "sync/atomic"
-)
-
-// debugMux, if set, causes messages in the connection protocol to be
-// logged.
-const debugMux = false
-
-// chanList is a thread safe channel list.
-type chanList struct {
-        // protects concurrent access to chans
-        sync.Mutex
-
-        // chans are indexed by the local id of the channel, which the
-        // other side should send in the PeersId field.
-        chans []*channel
-
-        // This is a debugging aid: it offsets all IDs by this
-        // amount. This helps distinguish otherwise identical
-        // server/client muxes
-        offset uint32
-}
-
-// Assigns a channel ID to the given channel.
-func (c *chanList) add(ch *channel) uint32 {
-        c.Lock()
-        defer c.Unlock()
-        for i := range c.chans {
-                if c.chans[i] == nil {
-                        c.chans[i] = ch
-                        return uint32(i) + c.offset
-                }
-        }
-        c.chans = append(c.chans, ch)
-        return uint32(len(c.chans)-1) + c.offset
-}
-
-// getChan returns the channel for the given ID.
-func (c *chanList) getChan(id uint32) *channel {
-        id -= c.offset
-
-        c.Lock()
-        defer c.Unlock()
-        if id < uint32(len(c.chans)) {
-                return c.chans[id]
-        }
-        return nil
-}
-
-func (c *chanList) remove(id uint32) {
-        id -= c.offset
-        c.Lock()
-        if id < uint32(len(c.chans)) {
-                c.chans[id] = nil
-        }
-        c.Unlock()
-}
-
-// dropAll forgets all channels it knows, returning them in a slice.
-func (c *chanList) dropAll() []*channel {
-        c.Lock()
-        defer c.Unlock()
-        var r []*channel
-
-        for _, ch := range c.chans {
-                if ch == nil {
-                        continue
-                }
-                r = append(r, ch)
-        }
-        c.chans = nil
-        return r
-}
-
-// mux represents the state for the SSH connection protocol, which
-// multiplexes many channels onto a single packet transport.
-type mux struct {
-        conn     packetConn
-        chanList chanList
-
-        incomingChannels chan NewChannel
-
-        globalSentMu     sync.Mutex
-        globalResponses  chan interface{}
-        incomingRequests chan *Request
-
-        errCond *sync.Cond
-        err     error
-}
-
-// When debugging, each new chanList instantiation has a different
-// offset.
-var globalOff uint32
-
-func (m *mux) Wait() error {
-        m.errCond.L.Lock()
-        defer m.errCond.L.Unlock()
-        for m.err == nil {
-                m.errCond.Wait()
-        }
-        return m.err
-}
-
-// newMux returns a mux that runs over the given connection.
-func newMux(p packetConn) *mux {
-        m := &mux{
-                conn:             p,
-                incomingChannels: make(chan NewChannel, chanSize),
-                globalResponses:  make(chan interface{}, 1),
-                incomingRequests: make(chan *Request, chanSize),
-                errCond:          newCond(),
-        }
-        if debugMux {
-                m.chanList.offset = atomic.AddUint32(&globalOff, 1)
-        }
-
-        go m.loop()
-        return m
-}
-
-func (m *mux) sendMessage(msg interface{}) error {
-        p := Marshal(msg)
-        if debugMux {
-                log.Printf("send global(%d): %#v", m.chanList.offset, msg)
-        }
-        return m.conn.writePacket(p)
-}
-
-func (m *mux) SendRequest(name string, wantReply bool, payload []byte) (bool, []byte, error) {
-        if wantReply {
-                m.globalSentMu.Lock()
-                defer m.globalSentMu.Unlock()
-        }
-
-        if err := m.sendMessage(globalRequestMsg{
-                Type:      name,
-                WantReply: wantReply,
-                Data:      payload,
-        }); err != nil {
-                return false, nil, err
-        }
-
-        if !wantReply {
-                return false, nil, nil
-        }
-
-        msg, ok := <-m.globalResponses
-        if !ok {
-                return false, nil, io.EOF
-        }
-        switch msg := msg.(type) {
-        case *globalRequestFailureMsg:
-                return false, msg.Data, nil
-        case *globalRequestSuccessMsg:
-                return true, msg.Data, nil
-        default:
-                return false, nil, fmt.Errorf("ssh: unexpected response to request: %#v", msg)
-        }
-}
-
-// ackRequest must be called after processing a global request that
-// has WantReply set.
-func (m *mux) ackRequest(ok bool, data []byte) error {
-        if ok {
-                return m.sendMessage(globalRequestSuccessMsg{Data: data})
-        }
-        return m.sendMessage(globalRequestFailureMsg{Data: data})
-}
-
-func (m *mux) Close() error {
-        return m.conn.Close()
-}
-
-// loop runs the connection machine. It will process packets until an
-// error is encountered. To synchronize on loop exit, use mux.Wait.
-func (m *mux) loop() {
-        var err error
-        for err == nil {
-                err = m.onePacket()
-        }
-
-        for _, ch := range m.chanList.dropAll() {
-                ch.close()
-        }
-
-        close(m.incomingChannels)
-        close(m.incomingRequests)
-        close(m.globalResponses)
-
-        m.conn.Close()
-
-        m.errCond.L.Lock()
-        m.err = err
-        m.errCond.Broadcast()
-        m.errCond.L.Unlock()
-
-        if debugMux {
-                log.Println("loop exit", err)
-        }
-}
-
-// onePacket reads and processes one packet.
-func (m *mux) onePacket() error {
-        packet, err := m.conn.readPacket()
-        if err != nil {
-                return err
-        }
-
-        if debugMux {
-                if packet[0] == msgChannelData || packet[0] == msgChannelExtendedData {
-                        log.Printf("decoding(%d): data packet - %d bytes", m.chanList.offset, len(packet))
-                } else {
-                        p, _ := decode(packet)
-                        log.Printf("decoding(%d): %d %#v - %d bytes", m.chanList.offset, packet[0], p, len(packet))
-                }
-        }
-
-        switch packet[0] {
-        case msgChannelOpen:
-                return m.handleChannelOpen(packet)
-        case msgGlobalRequest, msgRequestSuccess, msgRequestFailure:
-                return m.handleGlobalPacket(packet)
-        }
-
-        // assume a channel packet.
-        if len(packet) < 5 {
-                return parseError(packet[0])
-        }
-        id := binary.BigEndian.Uint32(packet[1:])
-        ch := m.chanList.getChan(id)
-        if ch == nil {
-                return fmt.Errorf("ssh: invalid channel %d", id)
-        }
-
-        return ch.handlePacket(packet)
-}
-
-func (m *mux) handleGlobalPacket(packet []byte) error {
-        msg, err := decode(packet)
-        if err != nil {
-                return err
-        }
-
-        switch msg := msg.(type) {
-        case *globalRequestMsg:
-                m.incomingRequests <- &Request{
-                        Type:      msg.Type,
-                        WantReply: msg.WantReply,
-                        Payload:   msg.Data,
-                        mux:       m,
-                }
-        case *globalRequestSuccessMsg, *globalRequestFailureMsg:
-                m.globalResponses <- msg
-        default:
-                panic(fmt.Sprintf("not a global message %#v", msg))
-        }
-
-        return nil
-}
-
-// handleChannelOpen schedules a channel to be Accept()ed.
-func (m *mux) handleChannelOpen(packet []byte) error {
-        var msg channelOpenMsg
-        if err := Unmarshal(packet, &msg); err != nil {
-                return err
-        }
-
-        if msg.MaxPacketSize < minPacketLength || msg.MaxPacketSize > 1<<31 {
-                failMsg := channelOpenFailureMsg{
-                        PeersId:  msg.PeersId,
-                        Reason:   ConnectionFailed,
-                        Message:  "invalid request",
-                        Language: "en_US.UTF-8",
-                }
-                return m.sendMessage(failMsg)
-        }
-
-        c := m.newChannel(msg.ChanType, channelInbound, msg.TypeSpecificData)
-        c.remoteId = msg.PeersId
-        c.maxRemotePayload = msg.MaxPacketSize
-        c.remoteWin.add(msg.PeersWindow)
-        m.incomingChannels <- c
-        return nil
-}
-
-func (m *mux) OpenChannel(chanType string, extra []byte) (Channel, <-chan *Request, error) {
-        ch, err := m.openChannel(chanType, extra)
-        if err != nil {
-                return nil, nil, err
-        }
-
-        return ch, ch.incomingRequests, nil
-}
-
-func (m *mux) openChannel(chanType string, extra []byte) (*channel, error) {
-        ch := m.newChannel(chanType, channelOutbound, extra)
-
-        ch.maxIncomingPayload = channelMaxPacket
-
-        open := channelOpenMsg{
-                ChanType:         chanType,
-                PeersWindow:      ch.myWindow,
-                MaxPacketSize:    ch.maxIncomingPayload,
-                TypeSpecificData: extra,
-                PeersId:          ch.localId,
-        }
-        if err := m.sendMessage(open); err != nil {
-                return nil, err
-        }
-
-        switch msg := (<-ch.msg).(type) {
-        case *channelOpenConfirmMsg:
-                return ch, nil
-        case *channelOpenFailureMsg:
-                return nil, &OpenChannelError{msg.Reason, msg.Message}
-        default:
-                return nil, fmt.Errorf("ssh: unexpected packet in response to channel open: %T", msg)
-        }
-}
diff --git a/vendor/golang.org/x/crypto/ssh/server.go b/vendor/golang.org/x/crypto/ssh/server.go
deleted file mode 100644
index 77c84d1..0000000
--- a/vendor/golang.org/x/crypto/ssh/server.go
+++ /dev/null
@@ -1,491 +0,0 @@
-// 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 ssh
-
-import (
-        "bytes"
-        "errors"
-        "fmt"
-        "io"
-        "net"
-        "strings"
-)
-
-// The Permissions type holds fine-grained permissions that are
-// specific to a user or a specific authentication method for a
-// user. Permissions, except for "source-address", must be enforced in
-// the server application layer, after successful authentication. The
-// Permissions are passed on in ServerConn so a server implementation
-// can honor them.
-type Permissions struct {
-        // Critical options restrict default permissions. Common
-        // restrictions are "source-address" and "force-command". If
-        // the server cannot enforce the restriction, or does not
-        // recognize it, the user should not authenticate.
-        CriticalOptions map[string]string
-
-        // Extensions are extra functionality that the server may
-        // offer on authenticated connections. Common extensions are
-        // "permit-agent-forwarding", "permit-X11-forwarding". Lack of
-        // support for an extension does not preclude authenticating a
-        // user.
-        Extensions map[string]string
-}
-
-// ServerConfig holds server specific configuration data.
-type ServerConfig struct {
-        // Config contains configuration shared between client and server.
-        Config
-
-        hostKeys []Signer
-
-        // NoClientAuth is true if clients are allowed to connect without
-        // authenticating.
-        NoClientAuth bool
-
-        // PasswordCallback, if non-nil, is called when a user
-        // attempts to authenticate using a password.
-        PasswordCallback func(conn ConnMetadata, password []byte) (*Permissions, error)
-
-        // PublicKeyCallback, if non-nil, is called when a client attempts public
-        // key authentication. It must return true if the given public key is
-        // valid for the given user. For example, see CertChecker.Authenticate.
-        PublicKeyCallback func(conn ConnMetadata, key PublicKey) (*Permissions, error)
-
-        // KeyboardInteractiveCallback, if non-nil, is called when
-        // keyboard-interactive authentication is selected (RFC
-        // 4256). The client object's Challenge function should be
-        // used to query the user. The callback may offer multiple
-        // Challenge rounds. To avoid information leaks, the client
-        // should be presented a challenge even if the user is
-        // unknown.
-        KeyboardInteractiveCallback func(conn ConnMetadata, client KeyboardInteractiveChallenge) (*Permissions, error)
-
-        // AuthLogCallback, if non-nil, is called to log all authentication
-        // attempts.
-        AuthLogCallback func(conn ConnMetadata, method string, err error)
-
-        // ServerVersion is the version identification string to announce in
-        // the public handshake.
-        // If empty, a reasonable default is used.
-        // Note that RFC 4253 section 4.2 requires that this string start with
-        // "SSH-2.0-".
-        ServerVersion string
-}
-
-// AddHostKey adds a private key as a host key. If an existing host
-// key exists with the same algorithm, it is overwritten. Each server
-// config must have at least one host key.
-func (s *ServerConfig) AddHostKey(key Signer) {
-        for i, k := range s.hostKeys {
-                if k.PublicKey().Type() == key.PublicKey().Type() {
-                        s.hostKeys[i] = key
-                        return
-                }
-        }
-
-        s.hostKeys = append(s.hostKeys, key)
-}
-
-// cachedPubKey contains the results of querying whether a public key is
-// acceptable for a user.
-type cachedPubKey struct {
-        user       string
-        pubKeyData []byte
-        result     error
-        perms      *Permissions
-}
-
-const maxCachedPubKeys = 16
-
-// pubKeyCache caches tests for public keys.  Since SSH clients
-// will query whether a public key is acceptable before attempting to
-// authenticate with it, we end up with duplicate queries for public
-// key validity.  The cache only applies to a single ServerConn.
-type pubKeyCache struct {
-        keys []cachedPubKey
-}
-
-// get returns the result for a given user/algo/key tuple.
-func (c *pubKeyCache) get(user string, pubKeyData []byte) (cachedPubKey, bool) {
-        for _, k := range c.keys {
-                if k.user == user && bytes.Equal(k.pubKeyData, pubKeyData) {
-                        return k, true
-                }
-        }
-        return cachedPubKey{}, false
-}
-
-// add adds the given tuple to the cache.
-func (c *pubKeyCache) add(candidate cachedPubKey) {
-        if len(c.keys) < maxCachedPubKeys {
-                c.keys = append(c.keys, candidate)
-        }
-}
-
-// ServerConn is an authenticated SSH connection, as seen from the
-// server
-type ServerConn struct {
-        Conn
-
-        // If the succeeding authentication callback returned a
-        // non-nil Permissions pointer, it is stored here.
-        Permissions *Permissions
-}
-
-// NewServerConn starts a new SSH server with c as the underlying
-// transport.  It starts with a handshake and, if the handshake is
-// unsuccessful, it closes the connection and returns an error.  The
-// Request and NewChannel channels must be serviced, or the connection
-// will hang.
-func NewServerConn(c net.Conn, config *ServerConfig) (*ServerConn, <-chan NewChannel, <-chan *Request, error) {
-        fullConf := *config
-        fullConf.SetDefaults()
-        s := &connection{
-                sshConn: sshConn{conn: c},
-        }
-        perms, err := s.serverHandshake(&fullConf)
-        if err != nil {
-                c.Close()
-                return nil, nil, nil, err
-        }
-        return &ServerConn{s, perms}, s.mux.incomingChannels, s.mux.incomingRequests, nil
-}
-
-// signAndMarshal signs the data with the appropriate algorithm,
-// and serializes the result in SSH wire format.
-func signAndMarshal(k Signer, rand io.Reader, data []byte) ([]byte, error) {
-        sig, err := k.Sign(rand, data)
-        if err != nil {
-                return nil, err
-        }
-
-        return Marshal(sig), nil
-}
-
-// handshake performs key exchange and user authentication.
-func (s *connection) serverHandshake(config *ServerConfig) (*Permissions, error) {
-        if len(config.hostKeys) == 0 {
-                return nil, errors.New("ssh: server has no host keys")
-        }
-
-        if !config.NoClientAuth && config.PasswordCallback == nil && config.PublicKeyCallback == nil && config.KeyboardInteractiveCallback == nil {
-                return nil, errors.New("ssh: no authentication methods configured but NoClientAuth is also false")
-        }
-
-        if config.ServerVersion != "" {
-                s.serverVersion = []byte(config.ServerVersion)
-        } else {
-                s.serverVersion = []byte(packageVersion)
-        }
-        var err error
-        s.clientVersion, err = exchangeVersions(s.sshConn.conn, s.serverVersion)
-        if err != nil {
-                return nil, err
-        }
-
-        tr := newTransport(s.sshConn.conn, config.Rand, false /* not client */)
-        s.transport = newServerTransport(tr, s.clientVersion, s.serverVersion, config)
-
-        if err := s.transport.waitSession(); err != nil {
-                return nil, err
-        }
-
-        // We just did the key change, so the session ID is established.
-        s.sessionID = s.transport.getSessionID()
-
-        var packet []byte
-        if packet, err = s.transport.readPacket(); err != nil {
-                return nil, err
-        }
-
-        var serviceRequest serviceRequestMsg
-        if err = Unmarshal(packet, &serviceRequest); err != nil {
-                return nil, err
-        }
-        if serviceRequest.Service != serviceUserAuth {
-                return nil, errors.New("ssh: requested service '" + serviceRequest.Service + "' before authenticating")
-        }
-        serviceAccept := serviceAcceptMsg{
-                Service: serviceUserAuth,
-        }
-        if err := s.transport.writePacket(Marshal(&serviceAccept)); err != nil {
-                return nil, err
-        }
-
-        perms, err := s.serverAuthenticate(config)
-        if err != nil {
-                return nil, err
-        }
-        s.mux = newMux(s.transport)
-        return perms, err
-}
-
-func isAcceptableAlgo(algo string) bool {
-        switch algo {
-        case KeyAlgoRSA, KeyAlgoDSA, KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521, KeyAlgoED25519,
-                CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01, CertAlgoECDSA384v01, CertAlgoECDSA521v01:
-                return true
-        }
-        return false
-}
-
-func checkSourceAddress(addr net.Addr, sourceAddrs string) error {
-        if addr == nil {
-                return errors.New("ssh: no address known for client, but source-address match required")
-        }
-
-        tcpAddr, ok := addr.(*net.TCPAddr)
-        if !ok {
-                return fmt.Errorf("ssh: remote address %v is not an TCP address when checking source-address match", addr)
-        }
-
-        for _, sourceAddr := range strings.Split(sourceAddrs, ",") {
-                if allowedIP := net.ParseIP(sourceAddr); allowedIP != nil {
-                        if allowedIP.Equal(tcpAddr.IP) {
-                                return nil
-                        }
-                } else {
-                        _, ipNet, err := net.ParseCIDR(sourceAddr)
-                        if err != nil {
-                                return fmt.Errorf("ssh: error parsing source-address restriction %q: %v", sourceAddr, err)
-                        }
-
-                        if ipNet.Contains(tcpAddr.IP) {
-                                return nil
-                        }
-                }
-        }
-
-        return fmt.Errorf("ssh: remote address %v is not allowed because of source-address restriction", addr)
-}
-
-func (s *connection) serverAuthenticate(config *ServerConfig) (*Permissions, error) {
-        sessionID := s.transport.getSessionID()
-        var cache pubKeyCache
-        var perms *Permissions
-
-userAuthLoop:
-        for {
-                var userAuthReq userAuthRequestMsg
-                if packet, err := s.transport.readPacket(); err != nil {
-                        return nil, err
-                } else if err = Unmarshal(packet, &userAuthReq); err != nil {
-                        return nil, err
-                }
-
-                if userAuthReq.Service != serviceSSH {
-                        return nil, errors.New("ssh: client attempted to negotiate for unknown service: " + userAuthReq.Service)
-                }
-
-                s.user = userAuthReq.User
-                perms = nil
-                authErr := errors.New("no auth passed yet")
-
-                switch userAuthReq.Method {
-                case "none":
-                        if config.NoClientAuth {
-                                authErr = nil
-                        }
-                case "password":
-                        if config.PasswordCallback == nil {
-                                authErr = errors.New("ssh: password auth not configured")
-                                break
-                        }
-                        payload := userAuthReq.Payload
-                        if len(payload) < 1 || payload[0] != 0 {
-                                return nil, parseError(msgUserAuthRequest)
-                        }
-                        payload = payload[1:]
-                        password, payload, ok := parseString(payload)
-                        if !ok || len(payload) > 0 {
-                                return nil, parseError(msgUserAuthRequest)
-                        }
-
-                        perms, authErr = config.PasswordCallback(s, password)
-                case "keyboard-interactive":
-                        if config.KeyboardInteractiveCallback == nil {
-                                authErr = errors.New("ssh: keyboard-interactive auth not configubred")
-                                break
-                        }
-
-                        prompter := &sshClientKeyboardInteractive{s}
-                        perms, authErr = config.KeyboardInteractiveCallback(s, prompter.Challenge)
-                case "publickey":
-                        if config.PublicKeyCallback == nil {
-                                authErr = errors.New("ssh: publickey auth not configured")
-                                break
-                        }
-                        payload := userAuthReq.Payload
-                        if len(payload) < 1 {
-                                return nil, parseError(msgUserAuthRequest)
-                        }
-                        isQuery := payload[0] == 0
-                        payload = payload[1:]
-                        algoBytes, payload, ok := parseString(payload)
-                        if !ok {
-                                return nil, parseError(msgUserAuthRequest)
-                        }
-                        algo := string(algoBytes)
-                        if !isAcceptableAlgo(algo) {
-                                authErr = fmt.Errorf("ssh: algorithm %q not accepted", algo)
-                                break
-                        }
-
-                        pubKeyData, payload, ok := parseString(payload)
-                        if !ok {
-                                return nil, parseError(msgUserAuthRequest)
-                        }
-
-                        pubKey, err := ParsePublicKey(pubKeyData)
-                        if err != nil {
-                                return nil, err
-                        }
-
-                        candidate, ok := cache.get(s.user, pubKeyData)
-                        if !ok {
-                                candidate.user = s.user
-                                candidate.pubKeyData = pubKeyData
-                                candidate.perms, candidate.result = config.PublicKeyCallback(s, pubKey)
-                                if candidate.result == nil && candidate.perms != nil && candidate.perms.CriticalOptions != nil && candidate.perms.CriticalOptions[sourceAddressCriticalOption] != "" {
-                                        candidate.result = checkSourceAddress(
-                                                s.RemoteAddr(),
-                                                candidate.perms.CriticalOptions[sourceAddressCriticalOption])
-                                }
-                                cache.add(candidate)
-                        }
-
-                        if isQuery {
-                                // The client can query if the given public key
-                                // would be okay.
-                                if len(payload) > 0 {
-                                        return nil, parseError(msgUserAuthRequest)
-                                }
-
-                                if candidate.result == nil {
-                                        okMsg := userAuthPubKeyOkMsg{
-                                                Algo:   algo,
-                                                PubKey: pubKeyData,
-                                        }
-                                        if err = s.transport.writePacket(Marshal(&okMsg)); err != nil {
-                                                return nil, err
-                                        }
-                                        continue userAuthLoop
-                                }
-                                authErr = candidate.result
-                        } else {
-                                sig, payload, ok := parseSignature(payload)
-                                if !ok || len(payload) > 0 {
-                                        return nil, parseError(msgUserAuthRequest)
-                                }
-                                // Ensure the public key algo and signature algo
-                                // are supported.  Compare the private key
-                                // algorithm name that corresponds to algo with
-                                // sig.Format.  This is usually the same, but
-                                // for certs, the names differ.
-                                if !isAcceptableAlgo(sig.Format) {
-                                        break
-                                }
-                                signedData := buildDataSignedForAuth(sessionID, userAuthReq, algoBytes, pubKeyData)
-
-                                if err := pubKey.Verify(signedData, sig); err != nil {
-                                        return nil, err
-                                }
-
-                                authErr = candidate.result
-                                perms = candidate.perms
-                        }
-                default:
-                        authErr = fmt.Errorf("ssh: unknown method %q", userAuthReq.Method)
-                }
-
-                if config.AuthLogCallback != nil {
-                        config.AuthLogCallback(s, userAuthReq.Method, authErr)
-                }
-
-                if authErr == nil {
-                        break userAuthLoop
-                }
-
-                var failureMsg userAuthFailureMsg
-                if config.PasswordCallback != nil {
-                        failureMsg.Methods = append(failureMsg.Methods, "password")
-                }
-                if config.PublicKeyCallback != nil {
-                        failureMsg.Methods = append(failureMsg.Methods, "publickey")
-                }
-                if config.KeyboardInteractiveCallback != nil {
-                        failureMsg.Methods = append(failureMsg.Methods, "keyboard-interactive")
-                }
-
-                if len(failureMsg.Methods) == 0 {
-                        return nil, errors.New("ssh: no authentication methods configured but NoClientAuth is also false")
-                }
-
-                if err := s.transport.writePacket(Marshal(&failureMsg)); err != nil {
-                        return nil, err
-                }
-        }
-
-        if err := s.transport.writePacket([]byte{msgUserAuthSuccess}); err != nil {
-                return nil, err
-        }
-        return perms, nil
-}
-
-// sshClientKeyboardInteractive implements a ClientKeyboardInteractive by
-// asking the client on the other side of a ServerConn.
-type sshClientKeyboardInteractive struct {
-        *connection
-}
-
-func (c *sshClientKeyboardInteractive) Challenge(user, instruction string, questions []string, echos []bool) (answers []string, err error) {
-        if len(questions) != len(echos) {
-                return nil, errors.New("ssh: echos and questions must have equal length")
-        }
-
-        var prompts []byte
-        for i := range questions {
-                prompts = appendString(prompts, questions[i])
-                prompts = appendBool(prompts, echos[i])
-        }
-
-        if err := c.transport.writePacket(Marshal(&userAuthInfoRequestMsg{
-                Instruction: instruction,
-                NumPrompts:  uint32(len(questions)),
-                Prompts:     prompts,
-        })); err != nil {
-                return nil, err
-        }
-
-        packet, err := c.transport.readPacket()
-        if err != nil {
-                return nil, err
-        }
-        if packet[0] != msgUserAuthInfoResponse {
-                return nil, unexpectedMessageError(msgUserAuthInfoResponse, packet[0])
-        }
-        packet = packet[1:]
-
-        n, packet, ok := parseUint32(packet)
-        if !ok || int(n) != len(questions) {
-                return nil, parseError(msgUserAuthInfoResponse)
-        }
-
-        for i := uint32(0); i < n; i++ {
-                ans, rest, ok := parseString(packet)
-                if !ok {
-                        return nil, parseError(msgUserAuthInfoResponse)
-                }
-
-                answers = append(answers, string(ans))
-                packet = rest
-        }
-        if len(packet) != 0 {
-                return nil, errors.New("ssh: junk at end of message")
-        }
-
-        return answers, nil
-}
diff --git a/vendor/golang.org/x/crypto/ssh/session.go b/vendor/golang.org/x/crypto/ssh/session.go
deleted file mode 100644
index 17e2aa8..0000000
--- a/vendor/golang.org/x/crypto/ssh/session.go
+++ /dev/null
@@ -1,627 +0,0 @@
-// 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 ssh
-
-// Session implements an interactive session described in
-// "RFC 4254, section 6".
-
-import (
-        "bytes"
-        "encoding/binary"
-        "errors"
-        "fmt"
-        "io"
-        "io/ioutil"
-        "sync"
-)
-
-type Signal string
-
-// POSIX signals as listed in RFC 4254 Section 6.10.
-const (
-        SIGABRT Signal = "ABRT"
-        SIGALRM Signal = "ALRM"
-        SIGFPE  Signal = "FPE"
-        SIGHUP  Signal = "HUP"
-        SIGILL  Signal = "ILL"
-        SIGINT  Signal = "INT"
-        SIGKILL Signal = "KILL"
-        SIGPIPE Signal = "PIPE"
-        SIGQUIT Signal = "QUIT"
-        SIGSEGV Signal = "SEGV"
-        SIGTERM Signal = "TERM"
-        SIGUSR1 Signal = "USR1"
-        SIGUSR2 Signal = "USR2"
-)
-
-var signals = map[Signal]int{
-        SIGABRT: 6,
-        SIGALRM: 14,
-        SIGFPE:  8,
-        SIGHUP:  1,
-        SIGILL:  4,
-        SIGINT:  2,
-        SIGKILL: 9,
-        SIGPIPE: 13,
-        SIGQUIT: 3,
-        SIGSEGV: 11,
-        SIGTERM: 15,
-}
-
-type TerminalModes map[uint8]uint32
-
-// POSIX terminal mode flags as listed in RFC 4254 Section 8.
-const (
-        tty_OP_END    = 0
-        VINTR         = 1
-        VQUIT         = 2
-        VERASE        = 3
-        VKILL         = 4
-        VEOF          = 5
-        VEOL          = 6
-        VEOL2         = 7
-        VSTART        = 8
-        VSTOP         = 9
-        VSUSP         = 10
-        VDSUSP        = 11
-        VREPRINT      = 12
-        VWERASE       = 13
-        VLNEXT        = 14
-        VFLUSH        = 15
-        VSWTCH        = 16
-        VSTATUS       = 17
-        VDISCARD      = 18
-        IGNPAR        = 30
-        PARMRK        = 31
-        INPCK         = 32
-        ISTRIP        = 33
-        INLCR         = 34
-        IGNCR         = 35
-        ICRNL         = 36
-        IUCLC         = 37
-        IXON          = 38
-        IXANY         = 39
-        IXOFF         = 40
-        IMAXBEL       = 41
-        ISIG          = 50
-        ICANON        = 51
-        XCASE         = 52
-        ECHO          = 53
-        ECHOE         = 54
-        ECHOK         = 55
-        ECHONL        = 56
-        NOFLSH        = 57
-        TOSTOP        = 58
-        IEXTEN        = 59
-        ECHOCTL       = 60
-        ECHOKE        = 61
-        PENDIN        = 62
-        OPOST         = 70
-        OLCUC         = 71
-        ONLCR         = 72
-        OCRNL         = 73
-        ONOCR         = 74
-        ONLRET        = 75
-        CS7           = 90
-        CS8           = 91
-        PARENB        = 92
-        PARODD        = 93
-        TTY_OP_ISPEED = 128
-        TTY_OP_OSPEED = 129
-)
-
-// A Session represents a connection to a remote command or shell.
-type Session struct {
-        // Stdin specifies the remote process's standard input.
-        // If Stdin is nil, the remote process reads from an empty
-        // bytes.Buffer.
-        Stdin io.Reader
-
-        // Stdout and Stderr specify the remote process's standard
-        // output and error.
-        //
-        // If either is nil, Run connects the corresponding file
-        // descriptor to an instance of ioutil.Discard. There is a
-        // fixed amount of buffering that is shared for the two streams.
-        // If either blocks it may eventually cause the remote
-        // command to block.
-        Stdout io.Writer
-        Stderr io.Writer
-
-        ch        Channel // the channel backing this session
-        started   bool    // true once Start, Run or Shell is invoked.
-        copyFuncs []func() error
-        errors    chan error // one send per copyFunc
-
-        // true if pipe method is active
-        stdinpipe, stdoutpipe, stderrpipe bool
-
-        // stdinPipeWriter is non-nil if StdinPipe has not been called
-        // and Stdin was specified by the user; it is the write end of
-        // a pipe connecting Session.Stdin to the stdin channel.
-        stdinPipeWriter io.WriteCloser
-
-        exitStatus chan error
-}
-
-// SendRequest sends an out-of-band channel request on the SSH channel
-// underlying the session.
-func (s *Session) SendRequest(name string, wantReply bool, payload []byte) (bool, error) {
-        return s.ch.SendRequest(name, wantReply, payload)
-}
-
-func (s *Session) Close() error {
-        return s.ch.Close()
-}
-
-// RFC 4254 Section 6.4.
-type setenvRequest struct {
-        Name  string
-        Value string
-}
-
-// Setenv sets an environment variable that will be applied to any
-// command executed by Shell or Run.
-func (s *Session) Setenv(name, value string) error {
-        msg := setenvRequest{
-                Name:  name,
-                Value: value,
-        }
-        ok, err := s.ch.SendRequest("env", true, Marshal(&msg))
-        if err == nil && !ok {
-                err = errors.New("ssh: setenv failed")
-        }
-        return err
-}
-
-// RFC 4254 Section 6.2.
-type ptyRequestMsg struct {
-        Term     string
-        Columns  uint32
-        Rows     uint32
-        Width    uint32
-        Height   uint32
-        Modelist string
-}
-
-// RequestPty requests the association of a pty with the session on the remote host.
-func (s *Session) RequestPty(term string, h, w int, termmodes TerminalModes) error {
-        var tm []byte
-        for k, v := range termmodes {
-                kv := struct {
-                        Key byte
-                        Val uint32
-                }{k, v}
-
-                tm = append(tm, Marshal(&kv)...)
-        }
-        tm = append(tm, tty_OP_END)
-        req := ptyRequestMsg{
-                Term:     term,
-                Columns:  uint32(w),
-                Rows:     uint32(h),
-                Width:    uint32(w * 8),
-                Height:   uint32(h * 8),
-                Modelist: string(tm),
-        }
-        ok, err := s.ch.SendRequest("pty-req", true, Marshal(&req))
-        if err == nil && !ok {
-                err = errors.New("ssh: pty-req failed")
-        }
-        return err
-}
-
-// RFC 4254 Section 6.5.
-type subsystemRequestMsg struct {
-        Subsystem string
-}
-
-// RequestSubsystem requests the association of a subsystem with the session on the remote host.
-// A subsystem is a predefined command that runs in the background when the ssh session is initiated
-func (s *Session) RequestSubsystem(subsystem string) error {
-        msg := subsystemRequestMsg{
-                Subsystem: subsystem,
-        }
-        ok, err := s.ch.SendRequest("subsystem", true, Marshal(&msg))
-        if err == nil && !ok {
-                err = errors.New("ssh: subsystem request failed")
-        }
-        return err
-}
-
-// RFC 4254 Section 6.9.
-type signalMsg struct {
-        Signal string
-}
-
-// Signal sends the given signal to the remote process.
-// sig is one of the SIG* constants.
-func (s *Session) Signal(sig Signal) error {
-        msg := signalMsg{
-                Signal: string(sig),
-        }
-
-        _, err := s.ch.SendRequest("signal", false, Marshal(&msg))
-        return err
-}
-
-// RFC 4254 Section 6.5.
-type execMsg struct {
-        Command string
-}
-
-// Start runs cmd on the remote host. Typically, the remote
-// server passes cmd to the shell for interpretation.
-// A Session only accepts one call to Run, Start or Shell.
-func (s *Session) Start(cmd string) error {
-        if s.started {
-                return errors.New("ssh: session already started")
-        }
-        req := execMsg{
-                Command: cmd,
-        }
-
-        ok, err := s.ch.SendRequest("exec", true, Marshal(&req))
-        if err == nil && !ok {
-                err = fmt.Errorf("ssh: command %v failed", cmd)
-        }
-        if err != nil {
-                return err
-        }
-        return s.start()
-}
-
-// Run runs cmd on the remote host. Typically, the remote
-// server passes cmd to the shell for interpretation.
-// A Session only accepts one call to Run, Start, Shell, Output,
-// or CombinedOutput.
-//
-// The returned error is nil if the command runs, has no problems
-// copying stdin, stdout, and stderr, and exits with a zero exit
-// status.
-//
-// If the remote server does not send an exit status, an error of type
-// *ExitMissingError is returned. If the command completes
-// unsuccessfully or is interrupted by a signal, the error is of type
-// *ExitError. Other error types may be returned for I/O problems.
-func (s *Session) Run(cmd string) error {
-        err := s.Start(cmd)
-        if err != nil {
-                return err
-        }
-        return s.Wait()
-}
-
-// Output runs cmd on the remote host and returns its standard output.
-func (s *Session) Output(cmd string) ([]byte, error) {
-        if s.Stdout != nil {
-                return nil, errors.New("ssh: Stdout already set")
-        }
-        var b bytes.Buffer
-        s.Stdout = &b
-        err := s.Run(cmd)
-        return b.Bytes(), err
-}
-
-type singleWriter struct {
-        b  bytes.Buffer
-        mu sync.Mutex
-}
-
-func (w *singleWriter) Write(p []byte) (int, error) {
-        w.mu.Lock()
-        defer w.mu.Unlock()
-        return w.b.Write(p)
-}
-
-// CombinedOutput runs cmd on the remote host and returns its combined
-// standard output and standard error.
-func (s *Session) CombinedOutput(cmd string) ([]byte, error) {
-        if s.Stdout != nil {
-                return nil, errors.New("ssh: Stdout already set")
-        }
-        if s.Stderr != nil {
-                return nil, errors.New("ssh: Stderr already set")
-        }
-        var b singleWriter
-        s.Stdout = &b
-        s.Stderr = &b
-        err := s.Run(cmd)
-        return b.b.Bytes(), err
-}
-
-// Shell starts a login shell on the remote host. A Session only
-// accepts one call to Run, Start, Shell, Output, or CombinedOutput.
-func (s *Session) Shell() error {
-        if s.started {
-                return errors.New("ssh: session already started")
-        }
-
-        ok, err := s.ch.SendRequest("shell", true, nil)
-        if err == nil && !ok {
-                return errors.New("ssh: could not start shell")
-        }
-        if err != nil {
-                return err
-        }
-        return s.start()
-}
-
-func (s *Session) start() error {
-        s.started = true
-
-        type F func(*Session)
-        for _, setupFd := range []F{(*Session).stdin, (*Session).stdout, (*Session).stderr} {
-                setupFd(s)
-        }
-
-        s.errors = make(chan error, len(s.copyFuncs))
-        for _, fn := range s.copyFuncs {
-                go func(fn func() error) {
-                        s.errors <- fn()
-                }(fn)
-        }
-        return nil
-}
-
-// Wait waits for the remote command to exit.
-//
-// The returned error is nil if the command runs, has no problems
-// copying stdin, stdout, and stderr, and exits with a zero exit
-// status.
-//
-// If the remote server does not send an exit status, an error of type
-// *ExitMissingError is returned. If the command completes
-// unsuccessfully or is interrupted by a signal, the error is of type
-// *ExitError. Other error types may be returned for I/O problems.
-func (s *Session) Wait() error {
-        if !s.started {
-                return errors.New("ssh: session not started")
-        }
-        waitErr := <-s.exitStatus
-
-        if s.stdinPipeWriter != nil {
-                s.stdinPipeWriter.Close()
-        }
-        var copyError error
-        for _ = range s.copyFuncs {
-                if err := <-s.errors; err != nil && copyError == nil {
-                        copyError = err
-                }
-        }
-        if waitErr != nil {
-                return waitErr
-        }
-        return copyError
-}
-
-func (s *Session) wait(reqs <-chan *Request) error {
-        wm := Waitmsg{status: -1}
-        // Wait for msg channel to be closed before returning.
-        for msg := range reqs {
-                switch msg.Type {
-                case "exit-status":
-                        wm.status = int(binary.BigEndian.Uint32(msg.Payload))
-                case "exit-signal":
-                        var sigval struct {
-                                Signal     string
-                                CoreDumped bool
-                                Error      string
-                                Lang       string
-                        }
-                        if err := Unmarshal(msg.Payload, &sigval); err != nil {
-                                return err
-                        }
-
-                        // Must sanitize strings?
-                        wm.signal = sigval.Signal
-                        wm.msg = sigval.Error
-                        wm.lang = sigval.Lang
-                default:
-                        // This handles keepalives and matches
-                        // OpenSSH's behaviour.
-                        if msg.WantReply {
-                                msg.Reply(false, nil)
-                        }
-                }
-        }
-        if wm.status == 0 {
-                return nil
-        }
-        if wm.status == -1 {
-                // exit-status was never sent from server
-                if wm.signal == "" {
-                        // signal was not sent either.  RFC 4254
-                        // section 6.10 recommends against this
-                        // behavior, but it is allowed, so we let
-                        // clients handle it.
-                        return &ExitMissingError{}
-                }
-                wm.status = 128
-                if _, ok := signals[Signal(wm.signal)]; ok {
-                        wm.status += signals[Signal(wm.signal)]
-                }
-        }
-
-        return &ExitError{wm}
-}
-
-// ExitMissingError is returned if a session is torn down cleanly, but
-// the server sends no confirmation of the exit status.
-type ExitMissingError struct{}
-
-func (e *ExitMissingError) Error() string {
-        return "wait: remote command exited without exit status or exit signal"
-}
-
-func (s *Session) stdin() {
-        if s.stdinpipe {
-                return
-        }
-        var stdin io.Reader
-        if s.Stdin == nil {
-                stdin = new(bytes.Buffer)
-        } else {
-                r, w := io.Pipe()
-                go func() {
-                        _, err := io.Copy(w, s.Stdin)
-                        w.CloseWithError(err)
-                }()
-                stdin, s.stdinPipeWriter = r, w
-        }
-        s.copyFuncs = append(s.copyFuncs, func() error {
-                _, err := io.Copy(s.ch, stdin)
-                if err1 := s.ch.CloseWrite(); err == nil && err1 != io.EOF {
-                        err = err1
-                }
-                return err
-        })
-}
-
-func (s *Session) stdout() {
-        if s.stdoutpipe {
-                return
-        }
-        if s.Stdout == nil {
-                s.Stdout = ioutil.Discard
-        }
-        s.copyFuncs = append(s.copyFuncs, func() error {
-                _, err := io.Copy(s.Stdout, s.ch)
-                return err
-        })
-}
-
-func (s *Session) stderr() {
-        if s.stderrpipe {
-                return
-        }
-        if s.Stderr == nil {
-                s.Stderr = ioutil.Discard
-        }
-        s.copyFuncs = append(s.copyFuncs, func() error {
-                _, err := io.Copy(s.Stderr, s.ch.Stderr())
-                return err
-        })
-}
-
-// sessionStdin reroutes Close to CloseWrite.
-type sessionStdin struct {
-        io.Writer
-        ch Channel
-}
-
-func (s *sessionStdin) Close() error {
-        return s.ch.CloseWrite()
-}
-
-// StdinPipe returns a pipe that will be connected to the
-// remote command's standard input when the command starts.
-func (s *Session) StdinPipe() (io.WriteCloser, error) {
-        if s.Stdin != nil {
-                return nil, errors.New("ssh: Stdin already set")
-        }
-        if s.started {
-                return nil, errors.New("ssh: StdinPipe after process started")
-        }
-        s.stdinpipe = true
-        return &sessionStdin{s.ch, s.ch}, nil
-}
-
-// StdoutPipe returns a pipe that will be connected to the
-// remote command's standard output when the command starts.
-// There is a fixed amount of buffering that is shared between
-// stdout and stderr streams. If the StdoutPipe reader is
-// not serviced fast enough it may eventually cause the
-// remote command to block.
-func (s *Session) StdoutPipe() (io.Reader, error) {
-        if s.Stdout != nil {
-                return nil, errors.New("ssh: Stdout already set")
-        }
-        if s.started {
-                return nil, errors.New("ssh: StdoutPipe after process started")
-        }
-        s.stdoutpipe = true
-        return s.ch, nil
-}
-
-// StderrPipe returns a pipe that will be connected to the
-// remote command's standard error when the command starts.
-// There is a fixed amount of buffering that is shared between
-// stdout and stderr streams. If the StderrPipe reader is
-// not serviced fast enough it may eventually cause the
-// remote command to block.
-func (s *Session) StderrPipe() (io.Reader, error) {
-        if s.Stderr != nil {
-                return nil, errors.New("ssh: Stderr already set")
-        }
-        if s.started {
-                return nil, errors.New("ssh: StderrPipe after process started")
-        }
-        s.stderrpipe = true
-        return s.ch.Stderr(), nil
-}
-
-// newSession returns a new interactive session on the remote host.
-func newSession(ch Channel, reqs <-chan *Request) (*Session, error) {
-        s := &Session{
-                ch: ch,
-        }
-        s.exitStatus = make(chan error, 1)
-        go func() {
-                s.exitStatus <- s.wait(reqs)
-        }()
-
-        return s, nil
-}
-
-// An ExitError reports unsuccessful completion of a remote command.
-type ExitError struct {
-        Waitmsg
-}
-
-func (e *ExitError) Error() string {
-        return e.Waitmsg.String()
-}
-
-// Waitmsg stores the information about an exited remote command
-// as reported by Wait.
-type Waitmsg struct {
-        status int
-        signal string
-        msg    string
-        lang   string
-}
-
-// ExitStatus returns the exit status of the remote command.
-func (w Waitmsg) ExitStatus() int {
-        return w.status
-}
-
-// Signal returns the exit signal of the remote command if
-// it was terminated violently.
-func (w Waitmsg) Signal() string {
-        return w.signal
-}
-
-// Msg returns the exit message given by the remote command
-func (w Waitmsg) Msg() string {
-        return w.msg
-}
-
-// Lang returns the language tag. See RFC 3066
-func (w Waitmsg) Lang() string {
-        return w.lang
-}
-
-func (w Waitmsg) String() string {
-        str := fmt.Sprintf("Process exited with status %v", w.status)
-        if w.signal != "" {
-                str += fmt.Sprintf(" from signal %v", w.signal)
-        }
-        if w.msg != "" {
-                str += fmt.Sprintf(". Reason was: %v", w.msg)
-        }
-        return str
-}
diff --git a/vendor/golang.org/x/crypto/ssh/tcpip.go b/vendor/golang.org/x/crypto/ssh/tcpip.go
deleted file mode 100644
index 6151241..0000000
--- a/vendor/golang.org/x/crypto/ssh/tcpip.go
+++ /dev/null
@@ -1,407 +0,0 @@
-// 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 ssh
-
-import (
-        "errors"
-        "fmt"
-        "io"
-        "math/rand"
-        "net"
-        "strconv"
-        "strings"
-        "sync"
-        "time"
-)
-
-// Listen requests the remote peer open a listening socket on
-// addr. Incoming connections will be available by calling Accept on
-// the returned net.Listener. The listener must be serviced, or the
-// SSH connection may hang.
-func (c *Client) Listen(n, addr string) (net.Listener, error) {
-        laddr, err := net.ResolveTCPAddr(n, addr)
-        if err != nil {
-                return nil, err
-        }
-        return c.ListenTCP(laddr)
-}
-
-// Automatic port allocation is broken with OpenSSH before 6.0. See
-// also https://bugzilla.mindrot.org/show_bug.cgi?id=2017.  In
-// particular, OpenSSH 5.9 sends a channelOpenMsg with port number 0,
-// rather than the actual port number. This means you can never open
-// two different listeners with auto allocated ports. We work around
-// this by trying explicit ports until we succeed.
-
-const openSSHPrefix = "OpenSSH_"
-
-var portRandomizer = rand.New(rand.NewSource(time.Now().UnixNano()))
-
-// isBrokenOpenSSHVersion returns true if the given version string
-// specifies a version of OpenSSH that is known to have a bug in port
-// forwarding.
-func isBrokenOpenSSHVersion(versionStr string) bool {
-        i := strings.Index(versionStr, openSSHPrefix)
-        if i < 0 {
-                return false
-        }
-        i += len(openSSHPrefix)
-        j := i
-        for ; j < len(versionStr); j++ {
-                if versionStr[j] < '0' || versionStr[j] > '9' {
-                        break
-                }
-        }
-        version, _ := strconv.Atoi(versionStr[i:j])
-        return version < 6
-}
-
-// autoPortListenWorkaround simulates automatic port allocation by
-// trying random ports repeatedly.
-func (c *Client) autoPortListenWorkaround(laddr *net.TCPAddr) (net.Listener, error) {
-        var sshListener net.Listener
-        var err error
-        const tries = 10
-        for i := 0; i < tries; i++ {
-                addr := *laddr
-                addr.Port = 1024 + portRandomizer.Intn(60000)
-                sshListener, err = c.ListenTCP(&addr)
-                if err == nil {
-                        laddr.Port = addr.Port
-                        return sshListener, err
-                }
-        }
-        return nil, fmt.Errorf("ssh: listen on random port failed after %d tries: %v", tries, err)
-}
-
-// RFC 4254 7.1
-type channelForwardMsg struct {
-        addr  string
-        rport uint32
-}
-
-// ListenTCP requests the remote peer open a listening socket
-// on laddr. Incoming connections will be available by calling
-// Accept on the returned net.Listener.
-func (c *Client) ListenTCP(laddr *net.TCPAddr) (net.Listener, error) {
-        if laddr.Port == 0 && isBrokenOpenSSHVersion(string(c.ServerVersion())) {
-                return c.autoPortListenWorkaround(laddr)
-        }
-
-        m := channelForwardMsg{
-                laddr.IP.String(),
-                uint32(laddr.Port),
-        }
-        // send message
-        ok, resp, err := c.SendRequest("tcpip-forward", true, Marshal(&m))
-        if err != nil {
-                return nil, err
-        }
-        if !ok {
-                return nil, errors.New("ssh: tcpip-forward request denied by peer")
-        }
-
-        // If the original port was 0, then the remote side will
-        // supply a real port number in the response.
-        if laddr.Port == 0 {
-                var p struct {
-                        Port uint32
-                }
-                if err := Unmarshal(resp, &p); err != nil {
-                        return nil, err
-                }
-                laddr.Port = int(p.Port)
-        }
-
-        // Register this forward, using the port number we obtained.
-        ch := c.forwards.add(*laddr)
-
-        return &tcpListener{laddr, c, ch}, nil
-}
-
-// forwardList stores a mapping between remote
-// forward requests and the tcpListeners.
-type forwardList struct {
-        sync.Mutex
-        entries []forwardEntry
-}
-
-// forwardEntry represents an established mapping of a laddr on a
-// remote ssh server to a channel connected to a tcpListener.
-type forwardEntry struct {
-        laddr net.TCPAddr
-        c     chan forward
-}
-
-// forward represents an incoming forwarded tcpip connection. The
-// arguments to add/remove/lookup should be address as specified in
-// the original forward-request.
-type forward struct {
-        newCh NewChannel   // the ssh client channel underlying this forward
-        raddr *net.TCPAddr // the raddr of the incoming connection
-}
-
-func (l *forwardList) add(addr net.TCPAddr) chan forward {
-        l.Lock()
-        defer l.Unlock()
-        f := forwardEntry{
-                addr,
-                make(chan forward, 1),
-        }
-        l.entries = append(l.entries, f)
-        return f.c
-}
-
-// See RFC 4254, section 7.2
-type forwardedTCPPayload struct {
-        Addr       string
-        Port       uint32
-        OriginAddr string
-        OriginPort uint32
-}
-
-// parseTCPAddr parses the originating address from the remote into a *net.TCPAddr.
-func parseTCPAddr(addr string, port uint32) (*net.TCPAddr, error) {
-        if port == 0 || port > 65535 {
-                return nil, fmt.Errorf("ssh: port number out of range: %d", port)
-        }
-        ip := net.ParseIP(string(addr))
-        if ip == nil {
-                return nil, fmt.Errorf("ssh: cannot parse IP address %q", addr)
-        }
-        return &net.TCPAddr{IP: ip, Port: int(port)}, nil
-}
-
-func (l *forwardList) handleChannels(in <-chan NewChannel) {
-        for ch := range in {
-                var payload forwardedTCPPayload
-                if err := Unmarshal(ch.ExtraData(), &payload); err != nil {
-                        ch.Reject(ConnectionFailed, "could not parse forwarded-tcpip payload: "+err.Error())
-                        continue
-                }
-
-                // RFC 4254 section 7.2 specifies that incoming
-                // addresses should list the address, in string
-                // format. It is implied that this should be an IP
-                // address, as it would be impossible to connect to it
-                // otherwise.
-                laddr, err := parseTCPAddr(payload.Addr, payload.Port)
-                if err != nil {
-                        ch.Reject(ConnectionFailed, err.Error())
-                        continue
-                }
-                raddr, err := parseTCPAddr(payload.OriginAddr, payload.OriginPort)
-                if err != nil {
-                        ch.Reject(ConnectionFailed, err.Error())
-                        continue
-                }
-
-                if ok := l.forward(*laddr, *raddr, ch); !ok {
-                        // Section 7.2, implementations MUST reject spurious incoming
-                        // connections.
-                        ch.Reject(Prohibited, "no forward for address")
-                        continue
-                }
-        }
-}
-
-// remove removes the forward entry, and the channel feeding its
-// listener.
-func (l *forwardList) remove(addr net.TCPAddr) {
-        l.Lock()
-        defer l.Unlock()
-        for i, f := range l.entries {
-                if addr.IP.Equal(f.laddr.IP) && addr.Port == f.laddr.Port {
-                        l.entries = append(l.entries[:i], l.entries[i+1:]...)
-                        close(f.c)
-                        return
-                }
-        }
-}
-
-// closeAll closes and clears all forwards.
-func (l *forwardList) closeAll() {
-        l.Lock()
-        defer l.Unlock()
-        for _, f := range l.entries {
-                close(f.c)
-        }
-        l.entries = nil
-}
-
-func (l *forwardList) forward(laddr, raddr net.TCPAddr, ch NewChannel) bool {
-        l.Lock()
-        defer l.Unlock()
-        for _, f := range l.entries {
-                if laddr.IP.Equal(f.laddr.IP) && laddr.Port == f.laddr.Port {
-                        f.c <- forward{ch, &raddr}
-                        return true
-                }
-        }
-        return false
-}
-
-type tcpListener struct {
-        laddr *net.TCPAddr
-
-        conn *Client
-        in   <-chan forward
-}
-
-// Accept waits for and returns the next connection to the listener.
-func (l *tcpListener) Accept() (net.Conn, error) {
-        s, ok := <-l.in
-        if !ok {
-                return nil, io.EOF
-        }
-        ch, incoming, err := s.newCh.Accept()
-        if err != nil {
-                return nil, err
-        }
-        go DiscardRequests(incoming)
-
-        return &tcpChanConn{
-                Channel: ch,
-                laddr:   l.laddr,
-                raddr:   s.raddr,
-        }, nil
-}
-
-// Close closes the listener.
-func (l *tcpListener) Close() error {
-        m := channelForwardMsg{
-                l.laddr.IP.String(),
-                uint32(l.laddr.Port),
-        }
-
-        // this also closes the listener.
-        l.conn.forwards.remove(*l.laddr)
-        ok, _, err := l.conn.SendRequest("cancel-tcpip-forward", true, Marshal(&m))
-        if err == nil && !ok {
-                err = errors.New("ssh: cancel-tcpip-forward failed")
-        }
-        return err
-}
-
-// Addr returns the listener's network address.
-func (l *tcpListener) Addr() net.Addr {
-        return l.laddr
-}
-
-// Dial initiates a connection to the addr from the remote host.
-// The resulting connection has a zero LocalAddr() and RemoteAddr().
-func (c *Client) Dial(n, addr string) (net.Conn, error) {
-        // Parse the address into host and numeric port.
-        host, portString, err := net.SplitHostPort(addr)
-        if err != nil {
-                return nil, err
-        }
-        port, err := strconv.ParseUint(portString, 10, 16)
-        if err != nil {
-                return nil, err
-        }
-        // Use a zero address for local and remote address.
-        zeroAddr := &net.TCPAddr{
-                IP:   net.IPv4zero,
-                Port: 0,
-        }
-        ch, err := c.dial(net.IPv4zero.String(), 0, host, int(port))
-        if err != nil {
-                return nil, err
-        }
-        return &tcpChanConn{
-                Channel: ch,
-                laddr:   zeroAddr,
-                raddr:   zeroAddr,
-        }, nil
-}
-
-// DialTCP connects to the remote address raddr on the network net,
-// which must be "tcp", "tcp4", or "tcp6".  If laddr is not nil, it is used
-// as the local address for the connection.
-func (c *Client) DialTCP(n string, laddr, raddr *net.TCPAddr) (net.Conn, error) {
-        if laddr == nil {
-                laddr = &net.TCPAddr{
-                        IP:   net.IPv4zero,
-                        Port: 0,
-                }
-        }
-        ch, err := c.dial(laddr.IP.String(), laddr.Port, raddr.IP.String(), raddr.Port)
-        if err != nil {
-                return nil, err
-        }
-        return &tcpChanConn{
-                Channel: ch,
-                laddr:   laddr,
-                raddr:   raddr,
-        }, nil
-}
-
-// RFC 4254 7.2
-type channelOpenDirectMsg struct {
-        raddr string
-        rport uint32
-        laddr string
-        lport uint32
-}
-
-func (c *Client) dial(laddr string, lport int, raddr string, rport int) (Channel, error) {
-        msg := channelOpenDirectMsg{
-                raddr: raddr,
-                rport: uint32(rport),
-                laddr: laddr,
-                lport: uint32(lport),
-        }
-        ch, in, err := c.OpenChannel("direct-tcpip", Marshal(&msg))
-        if err != nil {
-                return nil, err
-        }
-        go DiscardRequests(in)
-        return ch, err
-}
-
-type tcpChan struct {
-        Channel // the backing channel
-}
-
-// tcpChanConn fulfills the net.Conn interface without
-// the tcpChan having to hold laddr or raddr directly.
-type tcpChanConn struct {
-        Channel
-        laddr, raddr net.Addr
-}
-
-// LocalAddr returns the local network address.
-func (t *tcpChanConn) LocalAddr() net.Addr {
-        return t.laddr
-}
-
-// RemoteAddr returns the remote network address.
-func (t *tcpChanConn) RemoteAddr() net.Addr {
-        return t.raddr
-}
-
-// SetDeadline sets the read and write deadlines associated
-// with the connection.
-func (t *tcpChanConn) SetDeadline(deadline time.Time) error {
-        if err := t.SetReadDeadline(deadline); err != nil {
-                return err
-        }
-        return t.SetWriteDeadline(deadline)
-}
-
-// SetReadDeadline sets the read deadline.
-// A zero value for t means Read will not time out.
-// After the deadline, the error from Read will implement net.Error
-// with Timeout() == true.
-func (t *tcpChanConn) SetReadDeadline(deadline time.Time) error {
-        return errors.New("ssh: tcpChan: deadline not supported")
-}
-
-// SetWriteDeadline exists to satisfy the net.Conn interface
-// but is not implemented by this type.  It always returns an error.
-func (t *tcpChanConn) SetWriteDeadline(deadline time.Time) error {
-        return errors.New("ssh: tcpChan: deadline not supported")
-}
diff --git a/vendor/golang.org/x/crypto/ssh/transport.go b/vendor/golang.org/x/crypto/ssh/transport.go
deleted file mode 100644
index f9780e0..0000000
--- a/vendor/golang.org/x/crypto/ssh/transport.go
+++ /dev/null
@@ -1,375 +0,0 @@
-// 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 ssh
-
-import (
-        "bufio"
-        "errors"
-        "io"
-        "log"
-)
-
-// debugTransport if set, will print packet types as they go over the
-// wire. No message decoding is done, to minimize the impact on timing.
-const debugTransport = false
-
-const (
-        gcmCipherID    = "aes128-gcm@openssh.com"
-        aes128cbcID    = "aes128-cbc"
-        tripledescbcID = "3des-cbc"
-)
-
-// packetConn represents a transport that implements packet based
-// operations.
-type packetConn interface {
-        // Encrypt and send a packet of data to the remote peer.
-        writePacket(packet []byte) error
-
-        // Read a packet from the connection. The read is blocking,
-        // i.e. if error is nil, then the returned byte slice is
-        // always non-empty.
-        readPacket() ([]byte, error)
-
-        // Close closes the write-side of the connection.
-        Close() error
-}
-
-// transport is the keyingTransport that implements the SSH packet
-// protocol.
-type transport struct {
-        reader connectionState
-        writer connectionState
-
-        bufReader *bufio.Reader
-        bufWriter *bufio.Writer
-        rand      io.Reader
-        isClient  bool
-        io.Closer
-}
-
-// packetCipher represents a combination of SSH encryption/MAC
-// protocol.  A single instance should be used for one direction only.
-type packetCipher interface {
-        // writePacket encrypts the packet and writes it to w. The
-        // contents of the packet are generally scrambled.
-        writePacket(seqnum uint32, w io.Writer, rand io.Reader, packet []byte) error
-
-        // readPacket reads and decrypts a packet of data. The
-        // returned packet may be overwritten by future calls of
-        // readPacket.
-        readPacket(seqnum uint32, r io.Reader) ([]byte, error)
-}
-
-// connectionState represents one side (read or write) of the
-// connection. This is necessary because each direction has its own
-// keys, and can even have its own algorithms
-type connectionState struct {
-        packetCipher
-        seqNum           uint32
-        dir              direction
-        pendingKeyChange chan packetCipher
-}
-
-// prepareKeyChange sets up key material for a keychange. The key changes in
-// both directions are triggered by reading and writing a msgNewKey packet
-// respectively.
-func (t *transport) prepareKeyChange(algs *algorithms, kexResult *kexResult) error {
-        if ciph, err := newPacketCipher(t.reader.dir, algs.r, kexResult); err != nil {
-                return err
-        } else {
-                t.reader.pendingKeyChange <- ciph
-        }
-
-        if ciph, err := newPacketCipher(t.writer.dir, algs.w, kexResult); err != nil {
-                return err
-        } else {
-                t.writer.pendingKeyChange <- ciph
-        }
-
-        return nil
-}
-
-func (t *transport) printPacket(p []byte, write bool) {
-        if len(p) == 0 {
-                return
-        }
-        who := "server"
-        if t.isClient {
-                who = "client"
-        }
-        what := "read"
-        if write {
-                what = "write"
-        }
-
-        log.Println(what, who, p[0])
-}
-
-// Read and decrypt next packet.
-func (t *transport) readPacket() (p []byte, err error) {
-        for {
-                p, err = t.reader.readPacket(t.bufReader)
-                if err != nil {
-                        break
-                }
-                if len(p) == 0 || (p[0] != msgIgnore && p[0] != msgDebug) {
-                        break
-                }
-        }
-        if debugTransport {
-                t.printPacket(p, false)
-        }
-
-        return p, err
-}
-
-func (s *connectionState) readPacket(r *bufio.Reader) ([]byte, error) {
-        packet, err := s.packetCipher.readPacket(s.seqNum, r)
-        s.seqNum++
-        if err == nil && len(packet) == 0 {
-                err = errors.New("ssh: zero length packet")
-        }
-
-        if len(packet) > 0 {
-                switch packet[0] {
-                case msgNewKeys:
-                        select {
-                        case cipher := <-s.pendingKeyChange:
-                                s.packetCipher = cipher
-                        default:
-                                return nil, errors.New("ssh: got bogus newkeys message.")
-                        }
-
-                case msgDisconnect:
-                        // Transform a disconnect message into an
-                        // error. Since this is lowest level at which
-                        // we interpret message types, doing it here
-                        // ensures that we don't have to handle it
-                        // elsewhere.
-                        var msg disconnectMsg
-                        if err := Unmarshal(packet, &msg); err != nil {
-                                return nil, err
-                        }
-                        return nil, &msg
-                }
-        }
-
-        // The packet may point to an internal buffer, so copy the
-        // packet out here.
-        fresh := make([]byte, len(packet))
-        copy(fresh, packet)
-
-        return fresh, err
-}
-
-func (t *transport) writePacket(packet []byte) error {
-        if debugTransport {
-                t.printPacket(packet, true)
-        }
-        return t.writer.writePacket(t.bufWriter, t.rand, packet)
-}
-
-func (s *connectionState) writePacket(w *bufio.Writer, rand io.Reader, packet []byte) error {
-        changeKeys := len(packet) > 0 && packet[0] == msgNewKeys
-
-        err := s.packetCipher.writePacket(s.seqNum, w, rand, packet)
-        if err != nil {
-                return err
-        }
-        if err = w.Flush(); err != nil {
-                return err
-        }
-        s.seqNum++
-        if changeKeys {
-                select {
-                case cipher := <-s.pendingKeyChange:
-                        s.packetCipher = cipher
-                default:
-                        panic("ssh: no key material for msgNewKeys")
-                }
-        }
-        return err
-}
-
-func newTransport(rwc io.ReadWriteCloser, rand io.Reader, isClient bool) *transport {
-        t := &transport{
-                bufReader: bufio.NewReader(rwc),
-                bufWriter: bufio.NewWriter(rwc),
-                rand:      rand,
-                reader: connectionState{
-                        packetCipher:     &streamPacketCipher{cipher: noneCipher{}},
-                        pendingKeyChange: make(chan packetCipher, 1),
-                },
-                writer: connectionState{
-                        packetCipher:     &streamPacketCipher{cipher: noneCipher{}},
-                        pendingKeyChange: make(chan packetCipher, 1),
-                },
-                Closer: rwc,
-        }
-        t.isClient = isClient
-
-        if isClient {
-                t.reader.dir = serverKeys
-                t.writer.dir = clientKeys
-        } else {
-                t.reader.dir = clientKeys
-                t.writer.dir = serverKeys
-        }
-
-        return t
-}
-
-type direction struct {
-        ivTag     []byte
-        keyTag    []byte
-        macKeyTag []byte
-}
-
-var (
-        serverKeys = direction{[]byte{'B'}, []byte{'D'}, []byte{'F'}}
-        clientKeys = direction{[]byte{'A'}, []byte{'C'}, []byte{'E'}}
-)
-
-// generateKeys generates key material for IV, MAC and encryption.
-func generateKeys(d direction, algs directionAlgorithms, kex *kexResult) (iv, key, macKey []byte) {
-        cipherMode := cipherModes[algs.Cipher]
-        macMode := macModes[algs.MAC]
-
-        iv = make([]byte, cipherMode.ivSize)
-        key = make([]byte, cipherMode.keySize)
-        macKey = make([]byte, macMode.keySize)
-
-        generateKeyMaterial(iv, d.ivTag, kex)
-        generateKeyMaterial(key, d.keyTag, kex)
-        generateKeyMaterial(macKey, d.macKeyTag, kex)
-        return
-}
-
-// setupKeys sets the cipher and MAC keys from kex.K, kex.H and sessionId, as
-// described in RFC 4253, section 6.4. direction should either be serverKeys
-// (to setup server->client keys) or clientKeys (for client->server keys).
-func newPacketCipher(d direction, algs directionAlgorithms, kex *kexResult) (packetCipher, error) {
-        iv, key, macKey := generateKeys(d, algs, kex)
-
-        if algs.Cipher == gcmCipherID {
-                return newGCMCipher(iv, key, macKey)
-        }
-
-        if algs.Cipher == aes128cbcID {
-                return newAESCBCCipher(iv, key, macKey, algs)
-        }
-
-        if algs.Cipher == tripledescbcID {
-                return newTripleDESCBCCipher(iv, key, macKey, algs)
-        }
-
-        c := &streamPacketCipher{
-                mac: macModes[algs.MAC].new(macKey),
-                etm: macModes[algs.MAC].etm,
-        }
-        c.macResult = make([]byte, c.mac.Size())
-
-        var err error
-        c.cipher, err = cipherModes[algs.Cipher].createStream(key, iv)
-        if err != nil {
-                return nil, err
-        }
-
-        return c, nil
-}
-
-// generateKeyMaterial fills out with key material generated from tag, K, H
-// and sessionId, as specified in RFC 4253, section 7.2.
-func generateKeyMaterial(out, tag []byte, r *kexResult) {
-        var digestsSoFar []byte
-
-        h := r.Hash.New()
-        for len(out) > 0 {
-                h.Reset()
-                h.Write(r.K)
-                h.Write(r.H)
-
-                if len(digestsSoFar) == 0 {
-                        h.Write(tag)
-                        h.Write(r.SessionID)
-                } else {
-                        h.Write(digestsSoFar)
-                }
-
-                digest := h.Sum(nil)
-                n := copy(out, digest)
-                out = out[n:]
-                if len(out) > 0 {
-                        digestsSoFar = append(digestsSoFar, digest...)
-                }
-        }
-}
-
-const packageVersion = "SSH-2.0-Go"
-
-// Sends and receives a version line.  The versionLine string should
-// be US ASCII, start with "SSH-2.0-", and should not include a
-// newline. exchangeVersions returns the other side's version line.
-func exchangeVersions(rw io.ReadWriter, versionLine []byte) (them []byte, err error) {
-        // Contrary to the RFC, we do not ignore lines that don't
-        // start with "SSH-2.0-" to make the library usable with
-        // nonconforming servers.
-        for _, c := range versionLine {
-                // The spec disallows non US-ASCII chars, and
-                // specifically forbids null chars.
-                if c < 32 {
-                        return nil, errors.New("ssh: junk character in version line")
-                }
-        }
-        if _, err = rw.Write(append(versionLine, '\r', '\n')); err != nil {
-                return
-        }
-
-        them, err = readVersion(rw)
-        return them, err
-}
-
-// maxVersionStringBytes is the maximum number of bytes that we'll
-// accept as a version string. RFC 4253 section 4.2 limits this at 255
-// chars
-const maxVersionStringBytes = 255
-
-// Read version string as specified by RFC 4253, section 4.2.
-func readVersion(r io.Reader) ([]byte, error) {
-        versionString := make([]byte, 0, 64)
-        var ok bool
-        var buf [1]byte
-
-        for len(versionString) < maxVersionStringBytes {
-                _, err := io.ReadFull(r, buf[:])
-                if err != nil {
-                        return nil, err
-                }
-                // The RFC says that the version should be terminated with \r\n
-                // but several SSH servers actually only send a \n.
-                if buf[0] == '\n' {
-                        ok = true
-                        break
-                }
-
-                // non ASCII chars are disallowed, but we are lenient,
-                // since Go doesn't use null-terminated strings.
-
-                // The RFC allows a comment after a space, however,
-                // all of it (version and comments) goes into the
-                // session hash.
-                versionString = append(versionString, buf[0])
-        }
-
-        if !ok {
-                return nil, errors.New("ssh: overflow reading version string")
-        }
-
-        // There might be a '\r' on the end which we should remove.
-        if len(versionString) > 0 && versionString[len(versionString)-1] == '\r' {
-                versionString = versionString[:len(versionString)-1]
-        }
-        return versionString, nil
-}