md5_86.s
=============================================================================
; Copyright (C) 2004, crazyd
; All rights reserved.
;
; MD5 transform function
; generate a digest for each block of 64 bytes
;
; Author: crazyd (crazydiamondzgy_at_hotmail_dot_com)
; Date: 2002/12/29
;
; History:#write in nasm style for linux platform portation.(2005/02/15)
; #created in inline assembly(2002/12/29)
;=============================================================================
BITS 32
;=============================================================================
; Helper Macros
;=============================================================================
%define a esi
%define b edi
%define c edx
%define d ebx
%define x(i) [x + 4*i]
%define S11 7
%define S12 12
%define S13 17
%define S14 22
%define S21 5
%define S22 9
%define S23 14
%define S24 20
%define S31 4
%define S32 11
%define S33 16
%define S34 23
%define S41 6
%define S42 10
%define S43 15
%define S44 21
;=============================================================================
; esi, edi, edx, ebx store the 128 bits digest
; according to a, b, c, d of related C routines
; while eax and ecx are using as temporary registers.
; a, b, c, d, x, s, ac
; %1, %2, %3, %4, %5, %6, %7
;=============================================================================
%macro FF 7
mov eax, %2
and eax, %3
mov ecx, %2
not ecx
and ecx, %4
or ecx, eax
lea %1, [ecx + %1 + %7]
add %1, %5
rol %1, %6
add %1, %2
%endmacro
%macro GG 7
mov eax, %2
and eax, %4
mov ecx, %4
not ecx
and ecx, %3
or ecx, eax
lea %1, [ecx + %1 + %7]
add %1, %5
rol %1, %6
add %1, %2
%endmacro
%macro HH 7
mov ecx, %2
xor ecx, %3
xor ecx, %4
lea %1, [ecx + %1 + %7]
add %1, %5
rol %1, %6
add %1, %2
%endmacro
%macro II 7
mov ecx, %4
not ecx
or ecx, %2
xor ecx, %3
lea %1, [ecx + %1 + %7]
add %1, %5
rol %1, %6
add %1, %2
%endmacro
%define FF(a, b, c, d, x, s, ac) FF a, b, c, d, x, s, ac
%define GG(a, b, c, d, x, s, ac) GG a, b, c, d, x, s, ac
%define HH(a, b, c, d, x, s, ac) HH a, b, c, d, x, s, ac
%define II(a, b, c, d, x, s, ac) II a, b, c, d, x, s, ac
;=============================================================================
; Data
;=============================================================================
SECTION .data
ALIGN 16
x:
times 16 dd 0x0
;=============================================================================
; Code
;=============================================================================
SECTION .text
global _md5_transform
global _md5_memcpy
global _md5_memset
global _md5_encode
global _MD5Init
;
; void
; md5_transform(uint32_t state[4], unsigned char block[64])
;
ALIGN 16
_md5_transform:
; init the frame and stack
push ebp
mov ebp, esp
push ebx
push edx
push esi
push edi
; copy a block of 512 bits to array x
mov esi, [ebp + 12]
mov edi, x
mov ecx, 16
rep movsd
; state
mov eax, [ebp + 8]
mov a, [eax]
mov b, [eax + 4]
mov c, [eax + 8]
mov d, [eax + 12]
; Round 1
FF(a, b, c, d, x( 0), S11, 0xd76aa478) ; 1
FF(d, a, b, c, x( 1), S12, 0xe8c7b756) ; 2
FF(c, d, a, b, x( 2), S13, 0x242070db) ; 3
FF(b, c, d, a, x( 3), S14, 0xc1bdceee) ; 4
FF(a, b, c, d, x( 4), S11, 0xf57c0faf) ; 5
FF(d, a, b, c, x( 5), S12, 0x4787c62a) ; 6
FF(c, d, a, b, x( 6), S13, 0xa8304613) ; 7
FF(b, c, d, a, x( 7), S14, 0xfd469501) ; 8
FF(a, b, c, d, x( 8), S11, 0x698098d8) ; 9
FF(d, a, b, c, x( 9), S12, 0x8b44f7af) ; 10
FF(c, d, a, b, x(10), S13, 0xffff5bb1) ; 11
FF(b, c, d, a, x(11), S14, 0x895cd7be) ; 12
FF(a, b, c, d, x(12), S11, 0x6b901122) ; 13
FF(d, a, b, c, x(13), S12, 0xfd987193) ; 14
FF(c, d, a, b, x(14), S13, 0xa679438e) ; 15
FF(b, c, d, a, x(15), S14, 0x49b40821) ; 16
; Round 2
GG(a, b, c, d, x( 1), S21, 0xf61e2562) ; 17
GG(d, a, b, c, x( 6), S22, 0xc040b340) ; 18
GG(c, d, a, b, x(11), S23, 0x265e5a51) ; 19
GG(b, c, d, a, x( 0), S24, 0xe9b6c7aa) ; 20
GG(a, b, c, d, x( 5), S21, 0xd62f105d) ; 21
GG(d, a, b, c, x(10), S22, 0x2441453) ; 22
GG(c, d, a, b, x(15), S23, 0xd8a1e681) ; 23
GG(b, c, d, a, x( 4), S24, 0xe7d3fbc8) ; 24
GG(a, b, c, d, x( 9), S21, 0x21e1cde6) ; 25
GG(d, a, b, c, x(14), S22, 0xc33707d6) ; 26
GG(c, d, a, b, x( 3), S23, 0xf4d50d87) ; 27
GG(b, c, d, a, x( 8), S24, 0x455a14ed) ; 28
GG(a, b, c, d, x(13), S21, 0xa9e3e905) ; 29
GG(d, a, b, c, x( 2), S22, 0xfcefa3f8) ; 30
GG(c, d, a, b, x( 7), S23, 0x676f02d9) ; 31
GG(b, c, d, a, x(12), S24, 0x8d2a4c8a) ; 32
; Round 3
HH(a, b, c, d, x( 5), S31, 0xfffa3942) ; 33
HH(d, a, b, c, x( 8), S32, 0x8771f681) ; 34
HH(c, d, a, b, x(11), S33, 0x6d9d6122) ; 35
HH(b, c, d, a, x(14), S34, 0xfde5380c) ; 36
HH(a, b, c, d, x( 1), S31, 0xa4beea44) ; 37
HH(d, a, b, c, x( 4), S32, 0x4bdecfa9) ; 38
HH(c, d, a, b, x( 7), S33, 0xf6bb4b60) ; 39
HH(b, c, d, a, x(10), S34, 0xbebfbc70) ; 40
HH(a, b, c, d, x(13), S31, 0x289b7ec6) ; 41
HH(d, a, b, c, x( 0), S32, 0xeaa127fa) ; 42
HH(c, d, a, b, x( 3), S33, 0xd4ef3085) ; 43
HH(b, c, d, a, x( 6), S34, 0x4881d05) ; 44
HH(a, b, c, d, x( 9), S31, 0xd9d4d039) ; 45
HH(d, a, b, c, x(12), S32, 0xe6db99e5) ; 46
HH(c, d, a, b, x(15), S33, 0x1fa27cf8) ; 47
HH(b, c, d, a, x( 2), S34, 0xc4ac5665) ; 48
; Round 4
II(a, b, c, d, x( 0), S41, 0xf4292244) ; 49
II(d, a, b, c, x( 7), S42, 0x432aff97) ; 50
II(c, d, a, b, x(14), S43, 0xab9423a7) ; 51
II(b, c, d, a, x( 5), S44, 0xfc93a039) ; 52
II(a, b, c, d, x(12), S41, 0x655b59c3) ; 53
II(d, a, b, c, x( 3), S42, 0x8f0ccc92) ; 54
II(c, d, a, b, x(10), S43, 0xffeff47d) ; 55
II(b, c, d, a, x( 1), S44, 0x85845dd1) ; 56
II(a, b, c, d, x( 8), S41, 0x6fa87e4f) ; 57
II(d, a, b, c, x(15), S42, 0xfe2ce6e0) ; 58
II(c, d, a, b, x( 6), S43, 0xa3014314) ; 59
II(b, c, d, a, x(13), S44, 0x4e0811a1) ; 60
II(a, b, c, d, x( 4), S41, 0xf7537e82) ; 61
II(d, a, b, c, x(11), S42, 0xbd3af235) ; 62
II(c, d, a, b, x( 2), S43, 0x2ad7d2bb) ; 63
II(b, c, d, a, x( 9), S44, 0xeb86d391) ; 64
mov eax, [ebp + 8]
add [eax], a
add [eax + 4], b
add [eax + 8], c
add [eax + 12], d
; fini the frame and stack
pop edi
pop esi
pop edx
pop ebx
pop ebp
ret
;
; void md5_encode(unsigned char *output, uint32_t *input, int len)
;
ALIGN 16
_md5_encode:
push ebp
mov ebp, esp
push esi
push edi
mov edi, [ebp + 8]
mov esi, [ebp + 12]
mov ecx, [ebp + 16]
shr ecx, 2
rep movsd
pop edi
pop esi
pop ebp
ret
;
; void md5_memcpy (unsigned char *output, unsigned char *input, len)
;
ALIGN 16
_md5_memcpy:
push ebp
mov ebp, esp
push esi
push edi
mov edi, [ebp + 8]
mov esi, [ebp + 12]
mov ecx, [ebp + 16]
rep movsb
pop edi
pop esi
pop ebp
ret
;
; void md5_memset(unsigned char *output, int value, int len)
;
ALIGN 16
_md5_memset:
push ebp
mov ebp, esp
push edi
mov edi, [ebp + 8]
mov eax, [ebp + 12]
mov ecx, [ebp + 16]
rep stosb
pop edi
pop ebp
ret
;
; void md5_init(MD5_CTX *context)
;
ALIGN 16
_MD5Init:
mov eax, [esp + 4] ;context->state
xor ecx, ecx
mov [eax], dword 0x67452301
mov [eax + 04h], dword 0efcdab89h
mov [eax + 08h], dword 098badcfeh
mov [eax + 0ch], dword 010325476h
mov [eax + 10h], ecx ;context->count[0]
mov [eax + 14h], ecx ;context->count[1]
ret
