+/* md5.c */
+/*
+ This file is part of the Crypto-avr-lib/microcrypt-lib.
+ Copyright (C) 2008 Daniel Otte (daniel.otte@rub.de)
+
+ 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 3 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/>.
+*/
/*
- * File: md5.h
- * Author: Daniel Otte
- * Date: 31.07.2006
- * License: GPL
- * Description: Implementation of the MD5 hash algorithm as described in RFC 1321
+ * \file md5.c
+ * \author Daniel Otte
+ * \date 2006-07-31
+ * \par License:
+ * GPLv3 or later
+ * \brief Implementation of the MD5 hash algorithm as described in RFC 1321
*
*/
#include <stdint.h>
#include <string.h>
+ #undef DEBUG
+
void md5_init(md5_ctx_t *s){
s->counter = 0;
s->a[0] = 0x67452301;
typedef uint32_t md5_func_t(uint32_t, uint32_t, uint32_t);
-#define ROTL32(x,n) ((x)<<(n) | (x)>>(32-(n)))
+#define ROTL32(x,n) (((x)<<(n)) | ((x)>>(32-(n))))
void md5_core(uint32_t* a, uint8_t as, void* block, uint8_t k, uint8_t s, uint8_t i, uint8_t fi){
uint32_t t;
md5_func_t* funcs[]={md5_F, md5_G, md5_H, md5_I};
- char funcc[]={'*', '-', '+', '~'};
as &= 0x3;
/* a = b + ((a + F(b,c,d) + X[k] + T[i]) <<< s). */
+#ifdef DEBUG
+ char funcc[]={'*', '-', '+', '~'};
uart_putstr("\r\n DBG: md5_core [");
uart_putc(funcc[fi]);
uart_hexdump(&as, 1); uart_putc(' ');
uart_hexdump(&k, 1); uart_putc(' ');
uart_hexdump(&s, 1); uart_putc(' ');
uart_hexdump(&i, 1); uart_putc(']');
- t = a[as] + funcs[fi](a[(as+1)&3], a[(as+2)&3], a[(as+3)&3]) + ((uint8_t*)block)[k] + md5_T[i] ;
+#endif
+ t = a[as] + funcs[fi](a[(as+1)&3], a[(as+2)&3], a[(as+3)&3]) + ((uint32_t*)block)[k] + md5_T[i] ;
a[as]=a[(as+1)&3] + ROTL32(t, s);
}
uint32_t a[4];
uint8_t m,n,i=0;
/* this requires other mixed sboxes */
+#ifdef DEBUG
uart_putstr("\r\n DBG: md5_nextBlock: block:\r\n");
uart_hexdump(block, 16); uart_putstr("\r\n");
uart_hexdump(block+16, 16); uart_putstr("\r\n");
uart_hexdump(block+32, 16); uart_putstr("\r\n");
uart_hexdump(block+48, 16); uart_putstr("\r\n");
+#endif
a[0]=state->a[0];
a[1]=state->a[1];
for(m=0;m<4;++m){
for(n=0;n<4;++n){
md5_core(a, 4-n, block, m*4+n, s1t[n],i++,0);
-/* t = a[(4-s)&3] + md5_F(a[(4-s-1)&3],a[(4-s-2)&3],a[(4-s-3)&3])
- + ((uint8_t*)block)[s+4*k] + md5_T[i++];
- a[(4-s)&3] = a[(4-s-1)&3] + ROTL32(t, s*5+7);
-*/ }
+ }
}
/* round 2 */
uint8_t s2t[]={5,9,14,20};
md5_core(a, 4-n, block, (1+m*4+n*5)&0xf, s2t[n],i++,1);
}
}
-/* for(k=0;k<4;++k){
- for(s=0;s<4;++s){
- t = a[(4-s)&3] + md5_G(a[(4-s-1)&3],a[(4-s-2)&3],a[(4-s-3)&3])
- + ((uint8_t*)block)[((1+s*5) +(k*4))&0xf] + md5_T[i++];
- a[(4-s)&3] = a[(4-s-1)&3] + ROTL32(t, s2t[s]);
- }
- }
-*/
/* round 3 */
uint8_t s3t[]={4,11,16,23};
for(m=0;m<4;++m){
md5_core(a, 4-n, block, (5-m*4+n*3)&0xf, s3t[n],i++,2);
}
}
-/* for(k=0;k<4;++k){
- for(s=0;s<4;++s){
- t = a[(4-s)&3] + md5_H(a[(4-s-1)&3],a[(4-s-2)&3],a[(4-s-3)&3])
- + ((uint8_t*)block)[((5+s*3)-(k*4))&0xf] + md5_T[i++];
- a[(4-s)&3] = a[(4-s-1)&3] + ROTL32(t, s3t[s]);
- }
- } */
/* round 4 */
uint8_t s4t[]={6,10,15,21};
for(m=0;m<4;++m){
md5_core(a, 4-n, block, (0-m*4+n*7)&0xf, s4t[n],i++,3);
}
}
-/* for(k=0;k<4;++k){
- for(s=0;s<4;++s){
- t = a[(4-s)&3] + md5_I(a[(4-s-1)&3],a[(4-s-2)&3],a[(4-s-3)&3])
- + ((uint8_t*)block)[((s*7)-(k*4))&0xf] + md5_T[i++];
- a[(4-s)&3] = a[(4-s-1)&3] + ROTL32(t, s4t[s]);
- }
- } */
state->a[0] += a[0];
state->a[1] += a[1];
state->a[2] += a[2];
state->counter++;
}
-void md5_lastBlock(md5_ctx_t *state, void* block, uint16_t length){
+void md5_lastBlock(md5_ctx_t *state, void* block, uint16_t length_b){
uint16_t l;
uint8_t b[64];
- while (length >= 512){
+ while (length_b >= 512){
md5_nextBlock(state, block);
- length -= 512;
- block += 512/8;
+ length_b -= 512;
+ block = ((uint8_t*)block) + 512/8;
}
memset(b, 0, 64);
- memcpy(b, block, length/8);
+ memcpy(b, block, length_b/8);
/* insert padding one */
- l=length/8;
- if(length%8){
+ l=length_b/8;
+ if(length_b%8){
uint8_t t;
t = ((uint8_t*)block)[l];
- t |= (0x80>>(length%8));
+ t |= (0x80>>(length_b%8));
b[l]=t;
}else{
b[l]=0x80;
}
/* insert length value */
- if(l+sizeof(uint64_t) > 512/8){
+ if(l+sizeof(uint64_t) >= 512/8){
md5_nextBlock(state, b);
state->counter--;
memset(b, 0, 64);
}
- *((uint64_t*)&b[64-sizeof(uint64_t)]) = (state->counter * 512) + length;
+ *((uint64_t*)&b[64-sizeof(uint64_t)]) = (state->counter * 512) + length_b;
md5_nextBlock(state, b);
}
projects / avr-crypto-lib.git / blobdiff