274 lines
6.9 KiB
NASM
274 lines
6.9 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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proc sha1._.f
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push ebx ecx edx
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xor ecx, edx
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and ebx, ecx
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xor ebx, edx
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mov esi, ebx
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pop edx ecx ebx
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ret
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endp
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proc sha1._.g
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push ebx ecx edx
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xor ebx, ecx
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xor ebx, edx
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mov esi, ebx
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pop edx ecx ebx
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ret
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endp
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proc sha1._.h
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push ebx ecx edx
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mov esi, ebx
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and ebx, ecx
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and ecx, edx
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and esi, edx
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or ebx, ecx
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or esi, ebx
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pop edx ecx ebx
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ret
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endp
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macro sha1._.round f, k, c
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{
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mov esi, eax
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rol esi, 5
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mov [temp], esi
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call f
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add esi, edi
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add [temp], esi
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mov esi, [w + (c)*4]
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add esi, k
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add [temp], esi
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mov edi, edx
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mov edx, ecx
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mov ecx, ebx
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rol ecx, 30
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mov ebx, eax
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mov eax, [temp]
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}
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proc sha1.init _ctx
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mov ebx, [_ctx]
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lea edi, [ebx + ctx_sha1.hash]
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mov esi, sha1._.hash_init
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mov ecx, SHA1_HASH_SIZE/4
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rep movsd
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xor eax, eax
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mov [ebx + ctx_sha1.index], eax
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mov [ebx + ctx_sha1.msglen_0], eax
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mov [ebx + ctx_sha1.msglen_1], eax
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ret
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endp
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proc sha1._.block _hash
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locals
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temp rd 1
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w rd 80
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endl
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lea edi, [w]
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xor ecx, ecx
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@@:
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mov eax, [esi]
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add esi, 4
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bswap eax
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mov [edi], eax
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add edi, 4
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add ecx, 1
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cmp ecx, 16
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jne @b
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@@:
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mov eax, [w + (ecx - 3)*4]
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xor eax, [w + (ecx - 8)*4]
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xor eax, [w + (ecx - 14)*4]
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xor eax, [w + (ecx - 16)*4]
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rol eax, 1
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mov [w + ecx*4], eax
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add ecx, 1
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cmp ecx, 80
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jne @b
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mov edi, [_hash]
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mov eax, [edi + 0x00]
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mov ebx, [edi + 0x04]
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mov ecx, [edi + 0x08]
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mov edx, [edi + 0x0c]
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mov edi, [edi + 0x10]
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push esi
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repeat 20
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sha1._.round sha1._.f, 0x5a827999, %-1
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end repeat
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repeat 20
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sha1._.round sha1._.g, 0x6ed9eba1, %-1+20
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end repeat
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repeat 20
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sha1._.round sha1._.h, 0x8f1bbcdc, %-1+40
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end repeat
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repeat 20
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sha1._.round sha1._.g, 0xca62c1d6, %-1+60
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end repeat
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pop esi
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mov [temp], edi
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mov edi, [_hash]
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add [edi + 0x00], eax
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add [edi + 0x04], ebx
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add [edi + 0x08], ecx
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add [edi + 0x0c], edx
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mov eax, [temp]
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add [edi + 0x10], eax
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ret
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endp
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proc sha1.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_sha1.msglen_0], ecx
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adc [ebx + ctx_sha1.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_sha1.index]
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and eax, SHA1_BLOCK_SIZE-1
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jnz .copy_to_buf
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test esi, SHA1_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], SHA1_BLOCK_SIZE
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jb .copy_quit
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lea eax, [ebx + ctx_sha1.hash]
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stdcall sha1._.block, eax
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sub [_size], SHA1_BLOCK_SIZE
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; add esi, SHA1_BLOCK_SIZE ; FIXME
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jmp .no_copy
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.copy_to_buf:
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lea edi, [ebx + ctx_sha1.block]
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add edi, eax
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mov ecx, SHA1_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_sha1.index], ecx
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rep movsb
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lea eax, [ebx + ctx_sha1.hash]
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lea esi, [ebx + ctx_sha1.block]
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stdcall sha1._.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_sha1.block]
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mov eax, [ebx + ctx_sha1.index]
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and eax, SHA1_BLOCK_SIZE-1
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add edi, eax
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mov ecx, [_size]
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add [ebx + ctx_sha1.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 sha1.final _ctx
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mov ebx, [_ctx]
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lea edi, [ebx + ctx_sha1.block]
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mov ecx, [ebx + ctx_sha1.msglen_0]
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and ecx, SHA1_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, SHA1_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_sha1.block]
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lea eax, [ebx + ctx_sha1.hash]
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stdcall sha1._.block, eax
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mov ebx, [_ctx]
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lea edi, [ebx + ctx_sha1.block]
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mov ecx, SHA1_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_sha1.msglen_0]
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mov edx, [ebx + ctx_sha1.msglen_1]
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shld edx, eax, 3
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shl eax, 3
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bswap eax
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bswap edx
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mov dword[edi], edx
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mov dword[edi+4], eax
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lea esi, [ebx + ctx_sha1.block]
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lea eax, [ebx + ctx_sha1.hash]
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stdcall sha1._.block, eax
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mov ebx, [_ctx]
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lea eax, [ebx + ctx_sha1.hash]
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stdcall sha1._.postprocess, ebx, eax
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ret
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endp
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proc sha1._.postprocess _ctx, _hash
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mov ecx, 5
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mov esi, [_hash]
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mov edi, esi
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@@:
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lodsd
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bswap eax
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stosd
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dec ecx
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jnz @b
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ret
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endp
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align SHA1_ALIGN
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sha1._.hash_init dd 0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476, 0xc3d2e1f0
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