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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 dart.crypto; | 5 part of dart.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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| 109 // chunk. | 109 // chunk. |
| 110 _iterate() { | 110 _iterate() { |
| 111 var len = _pendingData.length; | 111 var len = _pendingData.length; |
| 112 var chunkSizeInBytes = _chunkSizeInWords * _BYTES_PER_WORD; | 112 var chunkSizeInBytes = _chunkSizeInWords * _BYTES_PER_WORD; |
| 113 if (len >= chunkSizeInBytes) { | 113 if (len >= chunkSizeInBytes) { |
| 114 var index = 0; | 114 var index = 0; |
| 115 for (; (len - index) >= chunkSizeInBytes; index += chunkSizeInBytes) { | 115 for (; (len - index) >= chunkSizeInBytes; index += chunkSizeInBytes) { |
| 116 _bytesToChunk(_pendingData, index); | 116 _bytesToChunk(_pendingData, index); |
| 117 _updateHash(_currentChunk); | 117 _updateHash(_currentChunk); |
| 118 } | 118 } |
| 119 var remaining = len - index; | 119 _pendingData = _pendingData.sublist(index, len); |
| 120 _pendingData = _pendingData.getRange(index, remaining); | |
| 121 } | 120 } |
| 122 } | 121 } |
| 123 | 122 |
| 124 // Finalize the data. Add a 1 bit to the end of the message. Expand with | 123 // Finalize the data. Add a 1 bit to the end of the message. Expand with |
| 125 // 0 bits and add the length of the message. | 124 // 0 bits and add the length of the message. |
| 126 _finalizeData() { | 125 _finalizeData() { |
| 127 _pendingData.add(0x80); | 126 _pendingData.add(0x80); |
| 128 var contentsLength = _lengthInBytes + 9; | 127 var contentsLength = _lengthInBytes + 9; |
| 129 var chunkSizeInBytes = _chunkSizeInWords * _BYTES_PER_WORD; | 128 var chunkSizeInBytes = _chunkSizeInWords * _BYTES_PER_WORD; |
| 130 var finalizedLength = _roundUp(contentsLength, chunkSizeInBytes); | 129 var finalizedLength = _roundUp(contentsLength, chunkSizeInBytes); |
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| 146 // Hasher state. | 145 // Hasher state. |
| 147 final int _chunkSizeInWords; | 146 final int _chunkSizeInWords; |
| 148 final int _digestSizeInWords; | 147 final int _digestSizeInWords; |
| 149 final bool _bigEndianWords; | 148 final bool _bigEndianWords; |
| 150 int _lengthInBytes = 0; | 149 int _lengthInBytes = 0; |
| 151 List<int> _pendingData; | 150 List<int> _pendingData; |
| 152 List<int> _currentChunk; | 151 List<int> _currentChunk; |
| 153 List<int> _h; | 152 List<int> _h; |
| 154 bool _digestCalled = false; | 153 bool _digestCalled = false; |
| 155 } | 154 } |
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