136 lines
3.6 KiB
C
136 lines
3.6 KiB
C
/* md5-asm.c */
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/*
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This file is part of the Crypto-avr-lib/microcrypt-lib.
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Copyright (C) 2008 Daniel Otte (daniel.otte@rub.de)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "md5.h"
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#include "uart.h"
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#include <stdint.h>
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#include <string.h>
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#undef DEBUG
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void md5_core(uint32_t* a, void* block, uint8_t as, uint8_t s, uint8_t i, uint8_t fi);
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/*
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#define ROTL32(x,n) (((x)<<(n)) | ((x)>>(32-(n))))
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static
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void md5_core(uint32_t* a, void* block, uint8_t as, uint8_t s, uint8_t i, uint8_t fi){
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uint32_t t;
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md5_func_t* funcs[]={md5_F, md5_G, md5_H, md5_I};
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as &= 0x3;
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// * a = b + ((a + F(b,c,d) + X[k] + T[i]) <<< s). * /
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#ifdef DEBUG
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char funcc[]={'*', '-', '+', '~'};
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uart_putstr("\r\n DBG: md5_core [");
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uart_putc(funcc[fi]);
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uart_hexdump(&as, 1); uart_putc(' ');
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uart_hexdump(&k, 1); uart_putc(' ');
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uart_hexdump(&s, 1); uart_putc(' ');
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uart_hexdump(&i, 1); uart_putc(']');
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#endif
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t = a[as] + funcs[fi](a[(as+1)&3], a[(as+2)&3], a[(as+3)&3]) + *((uint32_t*)block) + md5_T[i] ;
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a[as]=a[(as+1)&3] + ROTL32(t, s);
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}
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*/
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void md5_nextBlock(md5_ctx_t *state, void* block){
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uint32_t a[4];
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uint8_t m,n,i=0;
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/* this requires other mixed sboxes */
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#ifdef DEBUG
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uart_putstr("\r\n DBG: md5_nextBlock: block:\r\n");
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uart_hexdump(block, 16); uart_putstr("\r\n");
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uart_hexdump(block+16, 16); uart_putstr("\r\n");
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uart_hexdump(block+32, 16); uart_putstr("\r\n");
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uart_hexdump(block+48, 16); uart_putstr("\r\n");
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#endif
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a[0]=state->a[0];
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a[1]=state->a[1];
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a[2]=state->a[2];
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a[3]=state->a[3];
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/* round 1 */
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uint8_t s1t[]={7,12,17,22}; // 1,-1 1,4 2,-1 3,-2
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for(m=0;m<4;++m){
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for(n=0;n<4;++n){
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md5_core(a, &(((uint32_t*)block)[m*4+n]), 4-n, s1t[n],i++,0);
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}
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}
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/* round 2 */
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uint8_t s2t[]={5,9,14,20}; // 1,-3 1,1 2,-2 2,4
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for(m=0;m<4;++m){
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for(n=0;n<4;++n){
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md5_core(a, &(((uint32_t*)block)[(1+m*4+n*5)&0xf]), 4-n, s2t[n],i++,1);
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}
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}
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/* round 3 */
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uint8_t s3t[]={4,11,16,23}; // 0,4 1,3 2,0 3,-1
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for(m=0;m<4;++m){
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for(n=0;n<4;++n){
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md5_core(a, &(((uint32_t*)block)[(5-m*4+n*3)&0xf]), 4-n, s3t[n],i++,2);
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}
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}
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/* round 4 */
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uint8_t s4t[]={6,10,15,21}; // 1,-2 1,2 2,-1 3,-3
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for(m=0;m<4;++m){
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for(n=0;n<4;++n){
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md5_core(a, &(((uint32_t*)block)[(0-m*4+n*7)&0xf]), 4-n, s4t[n],i++,3);
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}
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}
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state->a[0] += a[0];
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state->a[1] += a[1];
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state->a[2] += a[2];
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state->a[3] += a[3];
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state->counter++;
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}
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void md5_lastBlock(md5_ctx_t *state, void* block, uint16_t length_b){
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uint16_t l;
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uint8_t b[64];
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while (length_b >= 512){
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md5_nextBlock(state, block);
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length_b -= 512;
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block = ((uint8_t*)block) + 512/8;
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}
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memset(b, 0, 64);
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memcpy(b, block, length_b/8);
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/* insert padding one */
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l=length_b/8;
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if(length_b%8){
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uint8_t t;
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t = ((uint8_t*)block)[l];
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t |= (0x80>>(length_b%8));
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b[l]=t;
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}else{
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b[l]=0x80;
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}
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/* insert length value */
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if(l+sizeof(uint64_t) >= 512/8){
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md5_nextBlock(state, b);
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state->counter--;
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memset(b, 0, 64);
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}
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*((uint64_t*)&b[64-sizeof(uint64_t)]) = (state->counter * 512) + length_b;
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md5_nextBlock(state, b);
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}
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