forked from KolibriOS/kolibrios
280 lines
9.6 KiB
NASM
280 lines
9.6 KiB
NASM
; libcrash -- cryptographic hash functions
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;
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; Copyright (C) 2012-2013,2016 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 <http://www.gnu.org/licenses/>.
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MD5_BLOCK_SIZE = 64
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MD5_HASH_SIZE = 16
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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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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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align MD5_ALIGN
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md5._.hash_init dd 0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476, 0xc3d2e1f0
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