1 files changed, 0 insertions, 383 deletions
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 04f3620..0000000
--- a/vendor/golang.org/x/crypto/ssh/common.go
+++ /dev/null
@@ -1,383 +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"
-	"math"
-	"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 lists ciphers we support but might not recommend.
-var supportedCiphers = []string{
-	"aes128-ctr", "aes192-ctr", "aes256-ctr",
-	"aes128-gcm@openssh.com",
-	chacha20Poly1305ID,
-	"arcfour256", "arcfour128", "arcfour",
-	aes128cbcID,
-	tripledescbcID,
-}
-
-// preferredCiphers specifies the default preference for ciphers.
-var preferredCiphers = []string{
-	"aes128-gcm@openssh.com",
-	chacha20Poly1305ID,
-	"aes128-ctr", "aes192-ctr", "aes256-ctr",
-}
-
-// 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,
-}
-
-// supportedHostKeyAlgos 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, a size suitable for the chosen cipher 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 = preferredCiphers
-	}
-	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 {
-		// cipher specific default
-	} else if c.RekeyThreshold < minRekeyThreshold {
-		c.RekeyThreshold = minRekeyThreshold
-	} else if c.RekeyThreshold >= math.MaxInt64 {
-		// Avoid weirdness if somebody uses -1 as a threshold.
-		c.RekeyThreshold = math.MaxInt64
-	}
-}
-
-// 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()
-}