mirror of https://github.com/gogits/gogs.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
61 lines
1.3 KiB
61 lines
1.3 KiB
// 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)} |
|
}}, |
|
}
|
|
|