+++ /dev/null
-/* md5.c */
-/*
- This file is part of the AVR-Crypto-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.c
- * \author Daniel Otte
- * \date 2006-07-31
- * \license GPLv3 or later
- * \brief Implementation of the MD5 hash algorithm as described in RFC 1321
- *
- */
-
- #include "md5.h"
- #include "md5_sbox.h"
- #include "cli.h"
- #include <stdint.h>
- #include <string.h>
-
- #undef DEBUG
-
-void md5_init(md5_ctx_t *s){
- s->counter = 0;
- s->a[0] = 0x67452301;
- s->a[1] = 0xefcdab89;
- s->a[2] = 0x98badcfe;
- s->a[3] = 0x10325476;
-}
-
-static
-uint32_t md5_F(uint32_t x, uint32_t y, uint32_t z){
- return ((x&y)|((~x)&z));
-}
-
-static
-uint32_t md5_G(uint32_t x, uint32_t y, uint32_t z){
- return ((x&z)|((~z)&y));
-}
-
-static
-uint32_t md5_H(uint32_t x, uint32_t y, uint32_t z){
- return (x^y^z);
-}
-
-static
-uint32_t md5_I(uint32_t x, uint32_t y, uint32_t z){
- return (y ^ (x | (~z)));
-}
-
-typedef uint32_t md5_func_t(uint32_t, uint32_t, uint32_t);
-
-#define ROTL32(x,n) (((x)<<(n)) | ((x)>>(32-(n))))
-
-static
-void md5_core(uint32_t* a, void* block, uint8_t as, uint8_t s, uint8_t i, uint8_t fi){
- uint32_t t;
- md5_func_t* funcs[]={md5_F, md5_G, md5_H, md5_I};
- as &= 0x3;
- /* a = b + ((a + F(b,c,d) + X[k] + T[i]) <<< s). */
-#ifdef DEBUG
- char funcc[]={'*', '-', '+', '~'};
- cli_putstr("\r\n DBG: md5_core [");
- cli_putc(funcc[fi]);
- cli_hexdump(&as, 1); cli_putc(' ');
- cli_hexdump(&k, 1); cli_putc(' ');
- cli_hexdump(&s, 1); cli_putc(' ');
- cli_hexdump(&i, 1); cli_putc(']');
-#endif
- t = a[as] + funcs[fi](a[(as+1)&3], a[(as+2)&3], a[(as+3)&3])
- + *((uint32_t*)block) + pgm_read_dword(md5_T+i) ;
- a[as]=a[(as+1)&3] + ROTL32(t, s);
-}
-
-void md5_nextBlock(md5_ctx_t *state, const void* block){
- uint32_t a[4];
- uint8_t m,n,i=0;
- /* this requires other mixed sboxes */
-#ifdef DEBUG
- cli_putstr("\r\n DBG: md5_nextBlock: block:\r\n");
- cli_hexdump(block, 16); cli_putstr("\r\n");
- cli_hexdump(block+16, 16); cli_putstr("\r\n");
- cli_hexdump(block+32, 16); cli_putstr("\r\n");
- cli_hexdump(block+48, 16); cli_putstr("\r\n");
-#endif
-
- a[0]=state->a[0];
- a[1]=state->a[1];
- a[2]=state->a[2];
- a[3]=state->a[3];
-
- /* round 1 */
- uint8_t s1t[]={7,12,17,22}; // 1,-1 1,4 2,-1 3,-2
- for(m=0;m<4;++m){
- for(n=0;n<4;++n){
- md5_core(a, &(((uint32_t*)block)[m*4+n]), 4-n, s1t[n],i++,0);
- }
- }
- /* round 2 */
- uint8_t s2t[]={5,9,14,20}; // 1,-3 1,1 2,-2 2,4
- for(m=0;m<4;++m){
- for(n=0;n<4;++n){
- md5_core(a, &(((uint32_t*)block)[(1+m*4+n*5)&0xf]), 4-n, s2t[n],i++,1);
- }
- }
- /* round 3 */
- uint8_t s3t[]={4,11,16,23}; // 0,4 1,3 2,0 3,-1
- for(m=0;m<4;++m){
- for(n=0;n<4;++n){
- md5_core(a, &(((uint32_t*)block)[(5-m*4+n*3)&0xf]), 4-n, s3t[n],i++,2);
- }
- }
- /* round 4 */
- uint8_t s4t[]={6,10,15,21}; // 1,-2 1,2 2,-1 3,-3
- for(m=0;m<4;++m){
- for(n=0;n<4;++n){
- md5_core(a, &(((uint32_t*)block)[(0-m*4+n*7)&0xf]), 4-n, s4t[n],i++,3);
- }
- }
- state->a[0] += a[0];
- state->a[1] += a[1];
- state->a[2] += a[2];
- state->a[3] += a[3];
- state->counter++;
-}
-
-void md5_lastBlock(md5_ctx_t *state, const void* block, uint16_t length_b){
- uint16_t l;
- uint8_t b[64];
- while (length_b >= 512){
- md5_nextBlock(state, block);
- length_b -= 512;
- block = ((uint8_t*)block) + 512/8;
- }
- memset(b, 0, 64);
- memcpy(b, block, length_b/8);
- /* insert padding one */
- l=length_b/8;
- if(length_b%8){
- uint8_t t;
- t = ((uint8_t*)block)[l];
- t |= (0x80>>(length_b%8));
- b[l]=t;
- }else{
- b[l]=0x80;
- }
- /* insert length value */
- if(l+sizeof(uint64_t) >= 512/8){
- md5_nextBlock(state, b);
- state->counter--;
- memset(b, 0, 64-8);
- }
- *((uint64_t*)&b[64-sizeof(uint64_t)]) = (state->counter * 512) + length_b;
- md5_nextBlock(state, b);
-}
-
-void md5_ctx2hash(md5_hash_t* dest, const md5_ctx_t* state){
- memcpy(dest, state->a, MD5_HASH_BYTES);
-}
-
-void md5(md5_hash_t* dest, const void* msg, uint32_t length_b){
- md5_ctx_t ctx;
- md5_init(&ctx);
- while(length_b>=MD5_BLOCK_BITS){
- md5_nextBlock(&ctx, msg);
- msg = (uint8_t*)msg + MD5_BLOCK_BYTES;
- length_b -= MD5_BLOCK_BITS;
- }
- md5_lastBlock(&ctx, msg, length_b);
- md5_ctx2hash(dest, &ctx);
-}
-