| // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| part of dart.crypto; |
| |
| // The MD5 hasher is used to compute an MD5 message digest. |
| class _MD5 extends _HashBase implements MD5 { |
| _MD5() : super(16, 4, false) { |
| _h[0] = 0x67452301; |
| _h[1] = 0xefcdab89; |
| _h[2] = 0x98badcfe; |
| _h[3] = 0x10325476; |
| } |
| |
| // Returns a new instance of this Hash. |
| MD5 newInstance() { |
| return new MD5(); |
| } |
| |
| static const _k = const [ |
| 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf, 0x4787c62a, |
| 0xa8304613, 0xfd469501, 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, |
| 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, 0xf61e2562, 0xc040b340, |
| 0x265e5a51, 0xe9b6c7aa, 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8, |
| 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905, 0xfcefa3f8, |
| 0x676f02d9, 0x8d2a4c8a, 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, |
| 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, 0x289b7ec6, 0xeaa127fa, |
| 0xd4ef3085, 0x04881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665, |
| 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92, |
| 0xffeff47d, 0x85845dd1, 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, |
| 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391 ]; |
| |
| static const _r = const [ |
| 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 5, 9, 14, |
| 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 4, 11, 16, 23, 4, 11, |
| 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 6, 10, 15, 21, 6, 10, 15, 21, 6, |
| 10, 15, 21, 6, 10, 15, 21 ]; |
| |
| // Compute one iteration of the MD5 algorithm with a chunk of |
| // 16 32-bit pieces. |
| void _updateHash(List<int> m) { |
| assert(m.length == 16); |
| |
| var a = _h[0]; |
| var b = _h[1]; |
| var c = _h[2]; |
| var d = _h[3]; |
| |
| var t0; |
| var t1; |
| |
| for (var i = 0; i < 64; i++) { |
| if (i < 16) { |
| t0 = (b & c) | ((~b & _MASK_32) & d); |
| t1 = i; |
| } else if (i < 32) { |
| t0 = (d & b) | ((~d & _MASK_32) & c); |
| t1 = ((5 * i) + 1) % 16; |
| } else if (i < 48) { |
| t0 = b ^ c ^ d; |
| t1 = ((3 * i) + 5) % 16; |
| } else { |
| t0 = c ^ (b | (~d & _MASK_32)); |
| t1 = (7 * i) % 16; |
| } |
| |
| var temp = d; |
| d = c; |
| c = b; |
| b = _add32(b, _rotl32(_add32(_add32(a, t0), |
| _add32(_k[i], m[t1])), |
| _r[i])); |
| a = temp; |
| } |
| |
| _h[0] = _add32(a, _h[0]); |
| _h[1] = _add32(b, _h[1]); |
| _h[2] = _add32(c, _h[2]); |
| _h[3] = _add32(d, _h[3]); |
| } |
| } |