Hulk did something

[bytom/vapor.git] / vendor / golang.org / x / crypto / ssh / mac.go

diff --git a/vendor/golang.org/x/crypto/ssh/mac.go b/vendor/golang.org/x/crypto/ssh/mac.go
new file mode 100644 (file)
index 0000000..c07a062
--- /dev/null
+++ b/vendor/golang.org/x/crypto/ssh/mac.go
@@ -0,0 +1,61 @@
+// 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)}
+       }},
+}