2016-07-31 02:16:12 +02:00
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; 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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macro md4._.f b, c, d
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{
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mov eax, c
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xor eax, d
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and eax, b
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xor eax, d
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}
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macro md4._.g b, c, d
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{
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push c d
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mov eax, b
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and eax, c
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and c, d
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and d, b
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or eax, c
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or eax, d
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pop d c
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}
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macro md4._.h b, c, d
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{
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mov eax, b
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xor eax, c
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xor eax, d
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}
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macro md4._.round func, a, b, c, d, index, shift, ac
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{
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func b, c, d
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add eax, [esi + index*4]
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lea a, [a + eax + ac]
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rol a, shift
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}
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proc md4.init _ctx
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mov ebx, [_ctx]
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lea edi, [ebx + ctx_md4.hash]
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mov esi, md4._.hash_init
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mov ecx, MD4_HASH_SIZE/4
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rep movsd
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xor eax, eax
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mov [ebx + ctx_md4.index], eax
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mov [ebx + ctx_md4.msglen_0], eax
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mov [ebx + ctx_md4.msglen_1], eax
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ret
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endp
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proc md4._.block _hash
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mov eax, [_hash]
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mov edi, [eax + 0x0]
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mov ebx, [eax + 0x4]
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mov ecx, [eax + 0x8]
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mov edx, [eax + 0xc]
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md4._.round md4._.f, edi, ebx, ecx, edx, 0, 3, 0x00000000
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md4._.round md4._.f, edx, edi, ebx, ecx, 1, 7, 0x00000000
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md4._.round md4._.f, ecx, edx, edi, ebx, 2, 11, 0x00000000
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md4._.round md4._.f, ebx, ecx, edx, edi, 3, 19, 0x00000000
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md4._.round md4._.f, edi, ebx, ecx, edx, 4, 3, 0x00000000
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md4._.round md4._.f, edx, edi, ebx, ecx, 5, 7, 0x00000000
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md4._.round md4._.f, ecx, edx, edi, ebx, 6, 11, 0x00000000
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md4._.round md4._.f, ebx, ecx, edx, edi, 7, 19, 0x00000000
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md4._.round md4._.f, edi, ebx, ecx, edx, 8, 3, 0x00000000
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md4._.round md4._.f, edx, edi, ebx, ecx, 9, 7, 0x00000000
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md4._.round md4._.f, ecx, edx, edi, ebx, 10, 11, 0x00000000
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md4._.round md4._.f, ebx, ecx, edx, edi, 11, 19, 0x00000000
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md4._.round md4._.f, edi, ebx, ecx, edx, 12, 3, 0x00000000
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md4._.round md4._.f, edx, edi, ebx, ecx, 13, 7, 0x00000000
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md4._.round md4._.f, ecx, edx, edi, ebx, 14, 11, 0x00000000
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md4._.round md4._.f, ebx, ecx, edx, edi, 15, 19, 0x00000000
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md4._.round md4._.g, edi, ebx, ecx, edx, 0, 3, 0x5a827999
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md4._.round md4._.g, edx, edi, ebx, ecx, 4, 5, 0x5a827999
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md4._.round md4._.g, ecx, edx, edi, ebx, 8, 9, 0x5a827999
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md4._.round md4._.g, ebx, ecx, edx, edi, 12, 13, 0x5a827999
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md4._.round md4._.g, edi, ebx, ecx, edx, 1, 3, 0x5a827999
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md4._.round md4._.g, edx, edi, ebx, ecx, 5, 5, 0x5a827999
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md4._.round md4._.g, ecx, edx, edi, ebx, 9, 9, 0x5a827999
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md4._.round md4._.g, ebx, ecx, edx, edi, 13, 13, 0x5a827999
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md4._.round md4._.g, edi, ebx, ecx, edx, 2, 3, 0x5a827999
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md4._.round md4._.g, edx, edi, ebx, ecx, 6, 5, 0x5a827999
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md4._.round md4._.g, ecx, edx, edi, ebx, 10, 9, 0x5a827999
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md4._.round md4._.g, ebx, ecx, edx, edi, 14, 13, 0x5a827999
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md4._.round md4._.g, edi, ebx, ecx, edx, 3, 3, 0x5a827999
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md4._.round md4._.g, edx, edi, ebx, ecx, 7, 5, 0x5a827999
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md4._.round md4._.g, ecx, edx, edi, ebx, 11, 9, 0x5a827999
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md4._.round md4._.g, ebx, ecx, edx, edi, 15, 13, 0x5a827999
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md4._.round md4._.h, edi, ebx, ecx, edx, 0, 3, 0x6ed9eba1
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md4._.round md4._.h, edx, edi, ebx, ecx, 8, 9, 0x6ed9eba1
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md4._.round md4._.h, ecx, edx, edi, ebx, 4, 11, 0x6ed9eba1
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md4._.round md4._.h, ebx, ecx, edx, edi, 12, 15, 0x6ed9eba1
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md4._.round md4._.h, edi, ebx, ecx, edx, 2, 3, 0x6ed9eba1
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md4._.round md4._.h, edx, edi, ebx, ecx, 10, 9, 0x6ed9eba1
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md4._.round md4._.h, ecx, edx, edi, ebx, 6, 11, 0x6ed9eba1
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md4._.round md4._.h, ebx, ecx, edx, edi, 14, 15, 0x6ed9eba1
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md4._.round md4._.h, edi, ebx, ecx, edx, 1, 3, 0x6ed9eba1
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md4._.round md4._.h, edx, edi, ebx, ecx, 9, 9, 0x6ed9eba1
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md4._.round md4._.h, ecx, edx, edi, ebx, 5, 11, 0x6ed9eba1
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md4._.round md4._.h, ebx, ecx, edx, edi, 13, 15, 0x6ed9eba1
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md4._.round md4._.h, edi, ebx, ecx, edx, 3, 3, 0x6ed9eba1
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md4._.round md4._.h, edx, edi, ebx, ecx, 11, 9, 0x6ed9eba1
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md4._.round md4._.h, ecx, edx, edi, ebx, 7, 11, 0x6ed9eba1
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md4._.round md4._.h, ebx, ecx, edx, edi, 15, 15, 0x6ed9eba1
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mov eax, [_hash]
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add [eax + 0x0], edi
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add [eax + 0x4], ebx
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add [eax + 0x8], ecx
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add [eax + 0xc], edx
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ret
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endp
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proc md4.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_md4.msglen_0], ecx
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adc [ebx + ctx_md4.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_md4.index]
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and eax, MD4_BLOCK_SIZE-1
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jnz .copy_to_buf
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test esi, MD4_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], MD4_BLOCK_SIZE
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jb .copy_quit
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lea eax, [ebx + ctx_md4.hash]
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stdcall md4._.block, eax
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sub [_size], MD4_BLOCK_SIZE
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add esi, MD4_BLOCK_SIZE
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jmp .no_copy
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.copy_to_buf:
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lea edi, [ebx + ctx_md4.block]
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add edi, eax
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mov ecx, MD4_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_md4.index], ecx
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rep movsb
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lea eax, [ebx + ctx_md4.hash]
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lea esi, [ebx + ctx_md4.block]
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stdcall md4._.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_md4.block]
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mov eax, [ebx + ctx_md4.index]
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and eax, MD4_BLOCK_SIZE-1
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add edi, eax
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mov ecx, [_size]
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add [ebx + ctx_md4.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 md4.final _ctx
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mov ebx, [_ctx]
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lea edi, [ebx + ctx_md4.block]
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mov ecx, [ebx + ctx_md4.msglen_0]
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and ecx, MD4_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, MD4_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_md4.block]
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lea eax, [ebx + ctx_md4.hash]
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stdcall md4._.block, eax
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mov ebx, [_ctx]
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lea edi, [ebx + ctx_md4.block]
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mov ecx, MD4_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_md4.msglen_0]
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mov edx, [ebx + ctx_md4.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_md4.block]
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lea eax, [ebx + ctx_md4.hash]
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stdcall md4._.block, eax
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ret
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endp
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align MD4_ALIGN
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md4._.hash_init dd 0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476, 0xc3d2e1f0
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