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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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