; libcrash -- cryptographic hash (and other) functions
;
; Copyright (C) <2012-2013,2016,2019,2021> Ivan Baravy
;
; SPDX-License-Identifier: GPL-2.0-or-later
;
; This program is free software: you can redistribute it and/or modify it under
; the terms of the GNU General Public License as published by the Free Software
; Foundation, either version 2 of the License, or (at your option) any later
; version.
;
; This program is distributed in the hope that it will be useful, but WITHOUT
; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
; FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License along with
; this program. If not, see <http://www.gnu.org/licenses/>.
MD5_BLOCK_SIZE = 64
MD5_ALIGN = 4
MD5_ALIGN_MASK = MD5_ALIGN - 1
struct ctx_md5
hash rb MD5_LEN
block rb MD5_BLOCK_SIZE
index rd 1
msglen_0 rd 1
msglen_1 rd 1
ends
assert sizeof.ctx_md5 <= LIBCRASH_CTX_LEN
macro md5._.f b, c, d
{
push c
xor c, d
and b, c
xor b, d
pop c
}
macro md5._.g b, c, d
{
push c d
and b, d
not d
and c, d
or b, c
pop d c
}
macro md5._.h b, c, d
{
xor b, c
xor b, d
}
macro md5._.i b, c, d
{
push d
not d
or b, d
xor b, c
pop d
}
macro md5._.round func, a, b, c, d, index, shift, ac
{
push b
func b, c, d
lea a, [a + b + ac]
add a, [esi + index*4]
rol a, shift
pop b
add a, b
}
proc md5.init uses ebx esi edi, _ctx
mov ebx, [_ctx]
lea edi, [ebx + ctx_md5.hash]
mov esi, md5._.hash_init
mov ecx, MD5_LEN/4
rep movsd
xor eax, eax
mov [ebx + ctx_md5.index], eax
mov [ebx + ctx_md5.msglen_0], eax
mov [ebx + ctx_md5.msglen_1], eax
ret
endp
proc md5._.block _hash
mov edi, [_hash]
mov eax, [edi + 0x0]
mov ebx, [edi + 0x4]
mov ecx, [edi + 0x8]
mov edx, [edi + 0xc]
md5._.round md5._.f, eax, ebx, ecx, edx, 0, 7, 0xd76aa478
md5._.round md5._.f, edx, eax, ebx, ecx, 1, 12, 0xe8c7b756
md5._.round md5._.f, ecx, edx, eax, ebx, 2, 17, 0x242070db
md5._.round md5._.f, ebx, ecx, edx, eax, 3, 22, 0xc1bdceee
md5._.round md5._.f, eax, ebx, ecx, edx, 4, 7, 0xf57c0faf
md5._.round md5._.f, edx, eax, ebx, ecx, 5, 12, 0x4787c62a
md5._.round md5._.f, ecx, edx, eax, ebx, 6, 17, 0xa8304613
md5._.round md5._.f, ebx, ecx, edx, eax, 7, 22, 0xfd469501
md5._.round md5._.f, eax, ebx, ecx, edx, 8, 7, 0x698098d8
md5._.round md5._.f, edx, eax, ebx, ecx, 9, 12, 0x8b44f7af
md5._.round md5._.f, ecx, edx, eax, ebx, 10, 17, 0xffff5bb1
md5._.round md5._.f, ebx, ecx, edx, eax, 11, 22, 0x895cd7be
md5._.round md5._.f, eax, ebx, ecx, edx, 12, 7, 0x6b901122
md5._.round md5._.f, edx, eax, ebx, ecx, 13, 12, 0xfd987193
md5._.round md5._.f, ecx, edx, eax, ebx, 14, 17, 0xa679438e
md5._.round md5._.f, ebx, ecx, edx, eax, 15, 22, 0x49b40821
md5._.round md5._.g, eax, ebx, ecx, edx, 1, 5, 0xf61e2562
md5._.round md5._.g, edx, eax, ebx, ecx, 6, 9, 0xc040b340
md5._.round md5._.g, ecx, edx, eax, ebx, 11, 14, 0x265e5a51
md5._.round md5._.g, ebx, ecx, edx, eax, 0, 20, 0xe9b6c7aa
md5._.round md5._.g, eax, ebx, ecx, edx, 5, 5, 0xd62f105d
md5._.round md5._.g, edx, eax, ebx, ecx, 10, 9, 0x02441453
md5._.round md5._.g, ecx, edx, eax, ebx, 15, 14, 0xd8a1e681
md5._.round md5._.g, ebx, ecx, edx, eax, 4, 20, 0xe7d3fbc8
md5._.round md5._.g, eax, ebx, ecx, edx, 9, 5, 0x21e1cde6
md5._.round md5._.g, edx, eax, ebx, ecx, 14, 9, 0xc33707d6
md5._.round md5._.g, ecx, edx, eax, ebx, 3, 14, 0xf4d50d87
md5._.round md5._.g, ebx, ecx, edx, eax, 8, 20, 0x455a14ed
md5._.round md5._.g, eax, ebx, ecx, edx, 13, 5, 0xa9e3e905
md5._.round md5._.g, edx, eax, ebx, ecx, 2, 9, 0xfcefa3f8
md5._.round md5._.g, ecx, edx, eax, ebx, 7, 14, 0x676f02d9
md5._.round md5._.g, ebx, ecx, edx, eax, 12, 20, 0x8d2a4c8a
md5._.round md5._.h, eax, ebx, ecx, edx, 5, 4, 0xfffa3942
md5._.round md5._.h, edx, eax, ebx, ecx, 8, 11, 0x8771f681
md5._.round md5._.h, ecx, edx, eax, ebx, 11, 16, 0x6d9d6122
md5._.round md5._.h, ebx, ecx, edx, eax, 14, 23, 0xfde5380c
md5._.round md5._.h, eax, ebx, ecx, edx, 1, 4, 0xa4beea44
md5._.round md5._.h, edx, eax, ebx, ecx, 4, 11, 0x4bdecfa9
md5._.round md5._.h, ecx, edx, eax, ebx, 7, 16, 0xf6bb4b60
md5._.round md5._.h, ebx, ecx, edx, eax, 10, 23, 0xbebfbc70
md5._.round md5._.h, eax, ebx, ecx, edx, 13, 4, 0x289b7ec6
md5._.round md5._.h, edx, eax, ebx, ecx, 0, 11, 0xeaa127fa
md5._.round md5._.h, ecx, edx, eax, ebx, 3, 16, 0xd4ef3085
md5._.round md5._.h, ebx, ecx, edx, eax, 6, 23, 0x04881d05
md5._.round md5._.h, eax, ebx, ecx, edx, 9, 4, 0xd9d4d039
md5._.round md5._.h, edx, eax, ebx, ecx, 12, 11, 0xe6db99e5
md5._.round md5._.h, ecx, edx, eax, ebx, 15, 16, 0x1fa27cf8
md5._.round md5._.h, ebx, ecx, edx, eax, 2, 23, 0xc4ac5665
md5._.round md5._.i, eax, ebx, ecx, edx, 0, 6, 0xf4292244
md5._.round md5._.i, edx, eax, ebx, ecx, 7, 10, 0x432aff97
md5._.round md5._.i, ecx, edx, eax, ebx, 14, 15, 0xab9423a7
md5._.round md5._.i, ebx, ecx, edx, eax, 5, 21, 0xfc93a039
md5._.round md5._.i, eax, ebx, ecx, edx, 12, 6, 0x655b59c3
md5._.round md5._.i, edx, eax, ebx, ecx, 3, 10, 0x8f0ccc92
md5._.round md5._.i, ecx, edx, eax, ebx, 10, 15, 0xffeff47d
md5._.round md5._.i, ebx, ecx, edx, eax, 1, 21, 0x85845dd1
md5._.round md5._.i, eax, ebx, ecx, edx, 8, 6, 0x6fa87e4f
md5._.round md5._.i, edx, eax, ebx, ecx, 15, 10, 0xfe2ce6e0
md5._.round md5._.i, ecx, edx, eax, ebx, 6, 15, 0xa3014314
md5._.round md5._.i, ebx, ecx, edx, eax, 13, 21, 0x4e0811a1
md5._.round md5._.i, eax, ebx, ecx, edx, 4, 6, 0xf7537e82
md5._.round md5._.i, edx, eax, ebx, ecx, 11, 10, 0xbd3af235
md5._.round md5._.i, ecx, edx, eax, ebx, 2, 15, 0x2ad7d2bb
md5._.round md5._.i, ebx, ecx, edx, eax, 9, 21, 0xeb86d391
mov edi, [_hash]
add [edi + 0x0], eax
add [edi + 0x4], ebx
add [edi + 0x8], ecx
add [edi + 0xc], edx
ret
endp
proc md5.update uses ebx esi edi, _ctx, _msg, _size
mov ebx, [_ctx]
mov ecx, [_size]
add [ebx + ctx_md5.msglen_0], ecx
adc [ebx + ctx_md5.msglen_1], 0
.next_block:
mov ebx, [_ctx]
mov esi, [_msg]
mov eax, [ebx + ctx_md5.index]
and eax, MD5_BLOCK_SIZE-1
jnz .copy_to_buf
test esi, MD5_ALIGN_MASK
jnz .copy_to_buf
.no_copy:
; data is aligned, hash it in place without copying
mov ebx, [_ctx]
cmp [_size], MD5_BLOCK_SIZE
jb .copy_quit
lea eax, [ebx + ctx_md5.hash]
stdcall md5._.block, eax
sub [_size], MD5_BLOCK_SIZE
add esi, MD5_BLOCK_SIZE
jmp .no_copy
.copy_to_buf:
lea edi, [ebx + ctx_md5.block]
add edi, eax
mov ecx, MD5_BLOCK_SIZE
sub ecx, eax
cmp [_size], ecx
jb .copy_quit
sub [_size], ecx
add [_msg], ecx
add [ebx + ctx_md5.index], ecx
rep movsb
lea eax, [ebx + ctx_md5.hash]
lea esi, [ebx + ctx_md5.block]
stdcall md5._.block, eax
jmp .next_block
.copy_quit:
mov ebx, [_ctx]
lea edi, [ebx + ctx_md5.block]
mov eax, [ebx + ctx_md5.index]
and eax, MD5_BLOCK_SIZE-1
add edi, eax
mov ecx, [_size]
add [ebx + ctx_md5.index], ecx
rep movsb
.quit:
ret
endp
proc md5.finish uses ebx esi edi, _ctx
mov ebx, [_ctx]
lea edi, [ebx + ctx_md5.block]
mov ecx, [ebx + ctx_md5.msglen_0]
and ecx, MD5_BLOCK_SIZE-1
add edi, ecx
mov byte[edi], 0x80
inc edi
neg ecx
add ecx, MD5_BLOCK_SIZE
cmp ecx, 8
ja .last
dec ecx
xor eax, eax
rep stosb
lea esi, [ebx + ctx_md5.block]
lea eax, [ebx + ctx_md5.hash]
stdcall md5._.block, eax
mov ebx, [_ctx]
lea edi, [ebx + ctx_md5.block]
mov ecx, MD5_BLOCK_SIZE+1
.last:
dec ecx
sub ecx, 8
xor eax, eax
rep stosb
mov eax, [ebx + ctx_md5.msglen_0]
mov edx, [ebx + ctx_md5.msglen_1]
shld edx, eax, 3
shl eax, 3
mov dword[edi], eax
mov dword[edi+4], edx
lea esi, [ebx + ctx_md5.block]
lea eax, [ebx + ctx_md5.hash]
stdcall md5._.block, eax
ret
endp
proc md5.oneshot _ctx, _data, _len
stdcall md5.init, [_ctx]
stdcall md5.update, [_ctx], [_data], [_len]
stdcall md5.finish, [_ctx]
ret
endp
iglobal
align MD5_ALIGN
md5._.hash_init dd 0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476, 0xc3d2e1f0
endg