3 This file is part of the Crypto-avr-lib/microcrypt-lib.
4 Copyright (C) 2008 Daniel Otte (daniel.otte@rub.de)
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
25 * \brief Implementation of the MD5 hash algorithm as described in RFC 1321
37 void md5_init(md5_ctx_t *s){
45 uint32_t md5_F(uint32_t x, uint32_t y, uint32_t z){
46 return ((x&y)|((~x)&z));
49 uint32_t md5_G(uint32_t x, uint32_t y, uint32_t z){
50 return ((x&z)|((~z)&y));
53 uint32_t md5_H(uint32_t x, uint32_t y, uint32_t z){
57 uint32_t md5_I(uint32_t x, uint32_t y, uint32_t z){
58 return (y ^ (x | (~z)));
61 typedef uint32_t md5_func_t(uint32_t, uint32_t, uint32_t);
63 #define ROTL32(x,n) (((x)<<(n)) | ((x)>>(32-(n))))
65 void md5_core(uint32_t* a, uint8_t as, void* block, uint8_t k, uint8_t s, uint8_t i, uint8_t fi){
67 md5_func_t* funcs[]={md5_F, md5_G, md5_H, md5_I};
69 /* a = b + ((a + F(b,c,d) + X[k] + T[i]) <<< s). */
71 char funcc[]={'*', '-', '+', '~'};
72 uart_putstr("\r\n DBG: md5_core [");
74 uart_hexdump(&as, 1); uart_putc(' ');
75 uart_hexdump(&k, 1); uart_putc(' ');
76 uart_hexdump(&s, 1); uart_putc(' ');
77 uart_hexdump(&i, 1); uart_putc(']');
79 t = a[as] + funcs[fi](a[(as+1)&3], a[(as+2)&3], a[(as+3)&3]) + ((uint32_t*)block)[k] + md5_T[i] ;
80 a[as]=a[(as+1)&3] + ROTL32(t, s);
83 void md5_nextBlock(md5_ctx_t *state, void* block){
86 /* this requires other mixed sboxes */
88 uart_putstr("\r\n DBG: md5_nextBlock: block:\r\n");
89 uart_hexdump(block, 16); uart_putstr("\r\n");
90 uart_hexdump(block+16, 16); uart_putstr("\r\n");
91 uart_hexdump(block+32, 16); uart_putstr("\r\n");
92 uart_hexdump(block+48, 16); uart_putstr("\r\n");
101 uint8_t s1t[]={7,12,17,22};
104 md5_core(a, 4-n, block, m*4+n, s1t[n],i++,0);
108 uint8_t s2t[]={5,9,14,20};
111 md5_core(a, 4-n, block, (1+m*4+n*5)&0xf, s2t[n],i++,1);
115 uint8_t s3t[]={4,11,16,23};
118 md5_core(a, 4-n, block, (5-m*4+n*3)&0xf, s3t[n],i++,2);
122 uint8_t s4t[]={6,10,15,21};
125 md5_core(a, 4-n, block, (0-m*4+n*7)&0xf, s4t[n],i++,3);
135 void md5_lastBlock(md5_ctx_t *state, void* block, uint16_t length){
138 while (length >= 512){
139 md5_nextBlock(state, block);
141 block = ((uint8_t*)block) + 512/8;
144 memcpy(b, block, length/8);
145 /* insert padding one */
149 t = ((uint8_t*)block)[l];
150 t |= (0x80>>(length%8));
155 /* insert length value */
156 if(l+sizeof(uint64_t) > 512/8){
157 md5_nextBlock(state, b);
161 *((uint64_t*)&b[64-sizeof(uint64_t)]) = (state->counter * 512) + length;
162 md5_nextBlock(state, b);