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1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 class _HMAC implements HMAC { | 5 class _HMAC implements HMAC { |
6 _HMAC(Hash this._hash, List<int> this._key) : _message = []; | 6 _HMAC(Hash this._hash, List<int> this._key) : _message = []; |
7 | 7 |
8 HMAC update(List<int> data) { | 8 HMAC update(List<int> data) { |
9 _message.addAll(data); | 9 _message.addAll(data); |
10 return this; | 10 return this; |
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42 // Compute outer padding. | 42 // Compute outer padding. |
43 for (var i = 0; i < blockSize; i++) { | 43 for (var i = 0; i < blockSize; i++) { |
44 padding[i] = 0x5c ^ _key[i]; | 44 padding[i] = 0x5c ^ _key[i]; |
45 } | 45 } |
46 | 46 |
47 // Outer hash computation which is the result. | 47 // Outer hash computation which is the result. |
48 _hash = _hash.newInstance(); | 48 _hash = _hash.newInstance(); |
49 return _hash.update(padding).update(innerHash).digest(); | 49 return _hash.update(padding).update(innerHash).digest(); |
50 } | 50 } |
51 | 51 |
| 52 bool verify(List<int> digest) { |
| 53 var computedDigest = this.digest(); |
| 54 if (digest.length != computedDigest.length) { |
| 55 throw new ArgumentError( |
| 56 'Invalid digest size: ${digest.length} in HMAC.verify. ' |
| 57 'Expected: ${_hash.blockSize}.'); |
| 58 } |
| 59 int result = 0; |
| 60 for (var i = 0; i < digest.length; i++) { |
| 61 result |= digest[i] ^ computedDigest[i]; |
| 62 } |
| 63 return result == 0; |
| 64 } |
| 65 |
52 // HMAC internal state. | 66 // HMAC internal state. |
53 Hash _hash; | 67 Hash _hash; |
54 List<int> _key; | 68 List<int> _key; |
55 List<int> _message; | 69 List<int> _message; |
56 } | 70 } |
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