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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 part of crypto; | 5 part of crypto; |
6 | 6 |
7 // Constants. | 7 // Constants. |
8 const _MASK_8 = 0xff; | 8 const _MASK_8 = 0xff; |
9 const _MASK_32 = 0xffffffff; | 9 const _MASK_32 = 0xffffffff; |
10 const _BITS_PER_BYTE = 8; | 10 const _BITS_PER_BYTE = 8; |
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24 abstract class _HashBase implements Hash { | 24 abstract class _HashBase implements Hash { |
25 final int _chunkSizeInWords; | 25 final int _chunkSizeInWords; |
26 final int _digestSizeInWords; | 26 final int _digestSizeInWords; |
27 final bool _bigEndianWords; | 27 final bool _bigEndianWords; |
28 final Uint32List _currentChunk; | 28 final Uint32List _currentChunk; |
29 final Uint32List _h; | 29 final Uint32List _h; |
30 int _lengthInBytes = 0; | 30 int _lengthInBytes = 0; |
31 List<int> _pendingData; | 31 List<int> _pendingData; |
32 bool _digestCalled = false; | 32 bool _digestCalled = false; |
33 | 33 |
34 _HashBase(int chunkSizeInWords, | 34 _HashBase( |
35 int digestSizeInWords, | 35 int chunkSizeInWords, int digestSizeInWords, bool this._bigEndianWords) |
36 bool this._bigEndianWords) | |
37 : _pendingData = [], | 36 : _pendingData = [], |
38 _currentChunk = new Uint32List(chunkSizeInWords), | 37 _currentChunk = new Uint32List(chunkSizeInWords), |
39 _h = new Uint32List(digestSizeInWords), | 38 _h = new Uint32List(digestSizeInWords), |
40 _chunkSizeInWords = chunkSizeInWords, | 39 _chunkSizeInWords = chunkSizeInWords, |
41 _digestSizeInWords = digestSizeInWords; | 40 _digestSizeInWords = digestSizeInWords; |
42 | 41 |
43 // Update the hasher with more data. | 42 // Update the hasher with more data. |
44 void add(List<int> data) { | 43 void add(List<int> data) { |
45 if (_digestCalled) { | 44 if (_digestCalled) { |
46 throw new StateError( | 45 throw new StateError( |
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142 assert(lengthInBits < pow(2, 32)); | 141 assert(lengthInBits < pow(2, 32)); |
143 if (_bigEndianWords) { | 142 if (_bigEndianWords) { |
144 _pendingData.addAll(_wordToBytes(0)); | 143 _pendingData.addAll(_wordToBytes(0)); |
145 _pendingData.addAll(_wordToBytes(lengthInBits & _MASK_32)); | 144 _pendingData.addAll(_wordToBytes(lengthInBits & _MASK_32)); |
146 } else { | 145 } else { |
147 _pendingData.addAll(_wordToBytes(lengthInBits & _MASK_32)); | 146 _pendingData.addAll(_wordToBytes(lengthInBits & _MASK_32)); |
148 _pendingData.addAll(_wordToBytes(0)); | 147 _pendingData.addAll(_wordToBytes(0)); |
149 } | 148 } |
150 } | 149 } |
151 } | 150 } |
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