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dunkaist |
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; libcrash -- cryptographic hash functions |
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; |
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; Copyright (C) 2012-2013,2016,2019 Ivan Baravy (dunkaist) |
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; |
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; This program is free software: you can redistribute it and/or modify |
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; it under the terms of the GNU General Public License as published by |
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; the Free Software Foundation, either version 3 of the License, or |
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; (at your option) any later version. |
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; |
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; This program is distributed in the hope that it will be useful, |
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; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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; GNU General Public License for more details. |
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; |
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; You should have received a copy of the GNU General Public License |
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; along with this program. If not, see . |
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MD5_HASH_SIZE = 16 |
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MD5_BLOCK_SIZE = 64 |
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MD5_ALIGN = 4 |
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MD5_ALIGN_MASK = MD5_ALIGN - 1 |
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struct ctx_md5 |
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hash rb MD5_HASH_SIZE |
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block rb MD5_BLOCK_SIZE |
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index rd 1 |
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msglen_0 rd 1 |
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msglen_1 rd 1 |
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ends |
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if defined sizeof.crash_ctx |
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assert sizeof.crash_ctx >= sizeof.ctx_md5 |
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end if |
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macro md5._.f b, c, d |
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{ |
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push c |
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xor c, d |
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and b, c |
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xor b, d |
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pop c |
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} |
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macro md5._.g b, c, d |
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{ |
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push c d |
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and b, d |
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not d |
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and c, d |
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or b, c |
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pop d c |
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} |
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macro md5._.h b, c, d |
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{ |
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xor b, c |
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xor b, d |
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} |
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macro md5._.i b, c, d |
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{ |
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push d |
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not d |
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or b, d |
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xor b, c |
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pop d |
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} |
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macro md5._.round func, a, b, c, d, index, shift, ac |
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{ |
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push b |
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func b, c, d |
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lea a, [a + b + ac] |
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add a, [esi + index*4] |
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rol a, shift |
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pop b |
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add a, b |
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} |
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proc md5.init _ctx |
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mov ebx, [_ctx] |
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lea edi, [ebx + ctx_md5.hash] |
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mov esi, md5._.hash_init |
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mov ecx, MD5_HASH_SIZE/4 |
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rep movsd |
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xor eax, eax |
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mov [ebx + ctx_md5.index], eax |
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mov [ebx + ctx_md5.msglen_0], eax |
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mov [ebx + ctx_md5.msglen_1], eax |
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ret |
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endp |
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proc md5._.block _hash |
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mov edi, [_hash] |
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mov eax, [edi + 0x0] |
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mov ebx, [edi + 0x4] |
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mov ecx, [edi + 0x8] |
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mov edx, [edi + 0xc] |
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md5._.round md5._.f, eax, ebx, ecx, edx, 0, 7, 0xd76aa478 |
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md5._.round md5._.f, edx, eax, ebx, ecx, 1, 12, 0xe8c7b756 |
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md5._.round md5._.f, ecx, edx, eax, ebx, 2, 17, 0x242070db |
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md5._.round md5._.f, ebx, ecx, edx, eax, 3, 22, 0xc1bdceee |
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md5._.round md5._.f, eax, ebx, ecx, edx, 4, 7, 0xf57c0faf |
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md5._.round md5._.f, edx, eax, ebx, ecx, 5, 12, 0x4787c62a |
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md5._.round md5._.f, ecx, edx, eax, ebx, 6, 17, 0xa8304613 |
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md5._.round md5._.f, ebx, ecx, edx, eax, 7, 22, 0xfd469501 |
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md5._.round md5._.f, eax, ebx, ecx, edx, 8, 7, 0x698098d8 |
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md5._.round md5._.f, edx, eax, ebx, ecx, 9, 12, 0x8b44f7af |
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md5._.round md5._.f, ecx, edx, eax, ebx, 10, 17, 0xffff5bb1 |
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md5._.round md5._.f, ebx, ecx, edx, eax, 11, 22, 0x895cd7be |
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md5._.round md5._.f, eax, ebx, ecx, edx, 12, 7, 0x6b901122 |
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md5._.round md5._.f, edx, eax, ebx, ecx, 13, 12, 0xfd987193 |
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md5._.round md5._.f, ecx, edx, eax, ebx, 14, 17, 0xa679438e |
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md5._.round md5._.f, ebx, ecx, edx, eax, 15, 22, 0x49b40821 |
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md5._.round md5._.g, eax, ebx, ecx, edx, 1, 5, 0xf61e2562 |
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md5._.round md5._.g, edx, eax, ebx, ecx, 6, 9, 0xc040b340 |
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md5._.round md5._.g, ecx, edx, eax, ebx, 11, 14, 0x265e5a51 |
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md5._.round md5._.g, ebx, ecx, edx, eax, 0, 20, 0xe9b6c7aa |
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md5._.round md5._.g, eax, ebx, ecx, edx, 5, 5, 0xd62f105d |
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md5._.round md5._.g, edx, eax, ebx, ecx, 10, 9, 0x02441453 |
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md5._.round md5._.g, ecx, edx, eax, ebx, 15, 14, 0xd8a1e681 |
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md5._.round md5._.g, ebx, ecx, edx, eax, 4, 20, 0xe7d3fbc8 |
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md5._.round md5._.g, eax, ebx, ecx, edx, 9, 5, 0x21e1cde6 |
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md5._.round md5._.g, edx, eax, ebx, ecx, 14, 9, 0xc33707d6 |
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md5._.round md5._.g, ecx, edx, eax, ebx, 3, 14, 0xf4d50d87 |
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md5._.round md5._.g, ebx, ecx, edx, eax, 8, 20, 0x455a14ed |
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md5._.round md5._.g, eax, ebx, ecx, edx, 13, 5, 0xa9e3e905 |
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md5._.round md5._.g, edx, eax, ebx, ecx, 2, 9, 0xfcefa3f8 |
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md5._.round md5._.g, ecx, edx, eax, ebx, 7, 14, 0x676f02d9 |
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md5._.round md5._.g, ebx, ecx, edx, eax, 12, 20, 0x8d2a4c8a |
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md5._.round md5._.h, eax, ebx, ecx, edx, 5, 4, 0xfffa3942 |
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md5._.round md5._.h, edx, eax, ebx, ecx, 8, 11, 0x8771f681 |
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md5._.round md5._.h, ecx, edx, eax, ebx, 11, 16, 0x6d9d6122 |
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md5._.round md5._.h, ebx, ecx, edx, eax, 14, 23, 0xfde5380c |
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md5._.round md5._.h, eax, ebx, ecx, edx, 1, 4, 0xa4beea44 |
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md5._.round md5._.h, edx, eax, ebx, ecx, 4, 11, 0x4bdecfa9 |
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md5._.round md5._.h, ecx, edx, eax, ebx, 7, 16, 0xf6bb4b60 |
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md5._.round md5._.h, ebx, ecx, edx, eax, 10, 23, 0xbebfbc70 |
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md5._.round md5._.h, eax, ebx, ecx, edx, 13, 4, 0x289b7ec6 |
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md5._.round md5._.h, edx, eax, ebx, ecx, 0, 11, 0xeaa127fa |
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md5._.round md5._.h, ecx, edx, eax, ebx, 3, 16, 0xd4ef3085 |
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md5._.round md5._.h, ebx, ecx, edx, eax, 6, 23, 0x04881d05 |
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md5._.round md5._.h, eax, ebx, ecx, edx, 9, 4, 0xd9d4d039 |
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md5._.round md5._.h, edx, eax, ebx, ecx, 12, 11, 0xe6db99e5 |
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md5._.round md5._.h, ecx, edx, eax, ebx, 15, 16, 0x1fa27cf8 |
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md5._.round md5._.h, ebx, ecx, edx, eax, 2, 23, 0xc4ac5665 |
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md5._.round md5._.i, eax, ebx, ecx, edx, 0, 6, 0xf4292244 |
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md5._.round md5._.i, edx, eax, ebx, ecx, 7, 10, 0x432aff97 |
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md5._.round md5._.i, ecx, edx, eax, ebx, 14, 15, 0xab9423a7 |
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md5._.round md5._.i, ebx, ecx, edx, eax, 5, 21, 0xfc93a039 |
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md5._.round md5._.i, eax, ebx, ecx, edx, 12, 6, 0x655b59c3 |
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md5._.round md5._.i, edx, eax, ebx, ecx, 3, 10, 0x8f0ccc92 |
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md5._.round md5._.i, ecx, edx, eax, ebx, 10, 15, 0xffeff47d |
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md5._.round md5._.i, ebx, ecx, edx, eax, 1, 21, 0x85845dd1 |
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md5._.round md5._.i, eax, ebx, ecx, edx, 8, 6, 0x6fa87e4f |
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md5._.round md5._.i, edx, eax, ebx, ecx, 15, 10, 0xfe2ce6e0 |
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md5._.round md5._.i, ecx, edx, eax, ebx, 6, 15, 0xa3014314 |
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md5._.round md5._.i, ebx, ecx, edx, eax, 13, 21, 0x4e0811a1 |
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md5._.round md5._.i, eax, ebx, ecx, edx, 4, 6, 0xf7537e82 |
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md5._.round md5._.i, edx, eax, ebx, ecx, 11, 10, 0xbd3af235 |
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md5._.round md5._.i, ecx, edx, eax, ebx, 2, 15, 0x2ad7d2bb |
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md5._.round md5._.i, ebx, ecx, edx, eax, 9, 21, 0xeb86d391 |
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mov edi, [_hash] |
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add [edi + 0x0], eax |
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add [edi + 0x4], ebx |
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add [edi + 0x8], ecx |
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add [edi + 0xc], edx |
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ret |
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endp |
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proc md5.update _ctx, _msg, _size |
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mov ebx, [_ctx] |
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mov ecx, [_size] |
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add [ebx + ctx_md5.msglen_0], ecx |
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adc [ebx + ctx_md5.msglen_1], 0 |
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.next_block: |
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mov ebx, [_ctx] |
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mov esi, [_msg] |
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mov eax, [ebx + ctx_md5.index] |
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and eax, MD5_BLOCK_SIZE-1 |
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jnz .copy_to_buf |
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test esi, MD5_ALIGN_MASK |
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jnz .copy_to_buf |
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.no_copy: |
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; data is aligned, hash it in place without copying |
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mov ebx, [_ctx] |
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cmp [_size], MD5_BLOCK_SIZE |
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jb .copy_quit |
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lea eax, [ebx + ctx_md5.hash] |
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stdcall md5._.block, eax |
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sub [_size], MD5_BLOCK_SIZE |
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add esi, MD5_BLOCK_SIZE |
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jmp .no_copy |
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.copy_to_buf: |
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lea edi, [ebx + ctx_md5.block] |
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add edi, eax |
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mov ecx, MD5_BLOCK_SIZE |
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sub ecx, eax |
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cmp [_size], ecx |
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jb .copy_quit |
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sub [_size], ecx |
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add [_msg], ecx |
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add [ebx + ctx_md5.index], ecx |
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rep movsb |
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lea eax, [ebx + ctx_md5.hash] |
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lea esi, [ebx + ctx_md5.block] |
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stdcall md5._.block, eax |
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jmp .next_block |
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.copy_quit: |
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mov ebx, [_ctx] |
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lea edi, [ebx + ctx_md5.block] |
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mov eax, [ebx + ctx_md5.index] |
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and eax, MD5_BLOCK_SIZE-1 |
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add edi, eax |
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mov ecx, [_size] |
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add [ebx + ctx_md5.index], ecx |
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rep movsb |
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.quit: |
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ret |
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endp |
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proc md5.final _ctx |
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mov ebx, [_ctx] |
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lea edi, [ebx + ctx_md5.block] |
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mov ecx, [ebx + ctx_md5.msglen_0] |
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and ecx, MD5_BLOCK_SIZE-1 |
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add edi, ecx |
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mov byte[edi], 0x80 |
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inc edi |
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neg ecx |
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add ecx, MD5_BLOCK_SIZE |
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cmp ecx, 8 |
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ja .last |
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dec ecx |
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xor eax, eax |
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rep stosb |
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lea esi, [ebx + ctx_md5.block] |
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lea eax, [ebx + ctx_md5.hash] |
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stdcall md5._.block, eax |
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mov ebx, [_ctx] |
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lea edi, [ebx + ctx_md5.block] |
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mov ecx, MD5_BLOCK_SIZE+1 |
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.last: |
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dec ecx |
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sub ecx, 8 |
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xor eax, eax |
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rep stosb |
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mov eax, [ebx + ctx_md5.msglen_0] |
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mov edx, [ebx + ctx_md5.msglen_1] |
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shld edx, eax, 3 |
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shl eax, 3 |
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mov dword[edi], eax |
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mov dword[edi+4], edx |
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lea esi, [ebx + ctx_md5.block] |
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lea eax, [ebx + ctx_md5.hash] |
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stdcall md5._.block, eax |
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ret |
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endp |
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proc md5.oneshot _ctx, _data, _len |
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stdcall md5.init, [_ctx] |
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stdcall md5.update, [_ctx], [_data], [_len] |
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stdcall md5.final, [_ctx] |
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ret |
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endp |
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iglobal |
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align MD5_ALIGN |
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md5._.hash_init dd 0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476, 0xc3d2e1f0 |
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endg |