/* md5.c */
/*
- This file is part of the Crypto-avr-lib/microcrypt-lib.
+ 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
/*
* \file md5.c
* \author Daniel Otte
- * \date 31.07.2006
- * \par License:
- * GPL
- * \brief Implementation of the MD5 hash algorithm as described in RFC 1321
+ * \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 "uart.h"
+ #include "cli.h"
#include <stdint.h>
#include <string.h>
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)));
}
#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){
+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[]={'*', '-', '+', '~'};
- 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(']');
+ 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)[k] + md5_T[i] ;
+ 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, void* block){
+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
- 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");
+ 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[3]=state->a[3];
/* round 1 */
- uint8_t s1t[]={7,12,17,22};
+ 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, 4-n, block, m*4+n, s1t[n],i++,0);
+ md5_core(a, &(((uint32_t*)block)[m*4+n]), 4-n, s1t[n],i++,0);
}
}
/* round 2 */
- uint8_t s2t[]={5,9,14,20};
+ 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, 4-n, block, (1+m*4+n*5)&0xf, s2t[n],i++,1);
+ 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};
+ 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, 4-n, block, (5-m*4+n*3)&0xf, s3t[n],i++,2);
+ 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};
+ 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, 4-n, block, (0-m*4+n*7)&0xf, s4t[n],i++,3);
+ md5_core(a, &(((uint32_t*)block)[(0-m*4+n*7)&0xf]), 4-n, s4t[n],i++,3);
}
}
state->a[0] += a[0];
state->counter++;
}
-void md5_lastBlock(md5_ctx_t *state, void* block, uint16_t length){
+void md5_lastBlock(md5_ctx_t *state, const 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;
+ 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);
+ memset(b, 0, 64-8);
}
- *((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);
}
+
+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);
+}
+
projects / avr-crypto-lib.git / blobdiff