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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / System.Runtime.DurableInstancing / System / Runtime / HashHelper.cs / 1305376 / HashHelper.cs
//------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------- namespace System.Runtime { static class HashHelper { // "derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm" // DO NOT USE FOR SECURITY PURPOSES. public static byte[] ComputeHash(byte[] buffer) { int[] shifts = new int[] { 7, 12, 17, 22, 5, 9, 14, 20, 4, 11, 16, 23, 6, 10, 15, 21 }; uint[] sines = new uint[] { 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 }; int blocks = (buffer.Length + 8) / 64 + 1; uint aa = 0x67452301; uint bb = 0xefcdab89; uint cc = 0x98badcfe; uint dd = 0x10325476; for (int i = 0; i < blocks; i++) { byte[] block = buffer; int offset = i * 64; if (offset + 64 > buffer.Length) { block = new byte[64]; for (int j = offset; j < buffer.Length; j++) { block[j - offset] = buffer[j]; } if (offset <= buffer.Length) { block[buffer.Length - offset] = 0x80; } if (i == blocks - 1) { block[56] = (byte)(buffer.Length << 3); block[57] = (byte)(buffer.Length >> 5); block[58] = (byte)(buffer.Length >> 13); block[59] = (byte)(buffer.Length >> 21); } offset = 0; } uint a = aa; uint b = bb; uint c = cc; uint d = dd; uint f; int g; for (int j = 0; j < 64; j++) { if (j < 16) { f = b & c | ~b & d; g = j; } else if (j < 32) { f = b & d | c & ~d; g = 5 * j + 1; } else if (j < 48) { f = b ^ c ^ d; g = 3 * j + 5; } else { f = c ^ (b | ~d); g = 7 * j; } g = (g & 0x0f) * 4 + offset; uint hold = d; d = c; c = b; b = a + f + sines[j] + (uint)(block[g] + (block[g + 1] << 8) + (block[g + 2] << 16) + (block[g + 3] << 24)); b = b << shifts[j & 3 | j >> 2 & ~3] | b >> 32 - shifts[j & 3 | j >> 2 & ~3]; b += c; a = hold; } aa += a; bb += b; cc += c; dd += d; } return new byte[] { (byte)aa, (byte)(aa >> 8), (byte)(aa >> 16), (byte)(aa >> 24), (byte)bb, (byte)(bb >> 8), (byte)(bb >> 16), (byte)(bb >> 24), (byte)cc, (byte)(cc >> 8), (byte)(cc >> 16), (byte)(cc >> 24), (byte)dd, (byte)(dd >> 8), (byte)(dd >> 16), (byte)(dd >> 24) }; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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