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/*
* This is an attempt at implementing md5 in c, so far it doesn't work :(.
* I took the values from wikipedia (https://en.wikipedia.org/wiki/MD5).
*
* Copyright (C) 2015 Tomasz Kramkowski <tk@the-tk.com>
*
* This program is free software. It is licensed under version 3 of the
* GNU General Public License.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see [http://www.gnu.org/licenses/].
*/
#include <math.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void shuffle_bytes(char *buf, size_t length)
{
length = length - length % 4;
for (size_t i = 0; i < length / 4; i++) {
char *bufc = buf + i * 4;
char chars[4] = {
bufc[3],
bufc[2],
bufc[1],
bufc[0]
};
strncpy(bufc, chars, 4);
}
}
int main(void)
{
uint32_t *s, *K, a0, b0, c0, d0, length;
char input[64] = "";
length = strlen(input);
s = (uint32_t []){
7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22,
5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20,
4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,
6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21};
K = (uint32_t []){
0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05,
0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391};
a0 = 0x67452301;
b0 = 0xefcdab89;
c0 = 0x98badcfe;
d0 = 0x10325476;
input[length] = 128;
for (uint8_t i = length + 1; i < 56; i++)
input[i] = 0;
/*((uint64_t *)input)[7] = (uint64_t)length;*/
input[63] = 0;
for (uint8_t i = 0; i < 64; i++)
putchar(input[i]);
/*shuffle_bytes(input, 64);*/
uint32_t *M = (uint32_t *)input;
uint32_t A = a0, B = b0, C = c0, D = d0;
for (uint32_t i = 0; i < 64; i ++) {
uint16_t F, g, dTemp;
switch (i) {
case 0 ... 15:
F = (B & C) | ((~B) & D);
g = i;
break;
case 16 ... 31:
F = (D & B) | ((~D) & C);
g = (5 * i + 1) % 16;
break;
case 32 ... 47:
F = B ^ C ^ D;
g = (3 * i + 5) % 16;
break;
case 48 ... 63:
F = C ^ (B | (~D));
g = (7 * i) % 16;
break;
}
dTemp = D;
D = C;
C = B;
B += ((A + F + K[i] + M[g]) << s[i]) | ((A + F + K[i] + M[g]) >> (32-s[i]));
A = dTemp;
}
a0 += A;
b0 += B;
c0 += C;
d0 += D;
/*shuffle_bytes((char *)&a0, 4);*/
/*shuffle_bytes((char *)&b0, 4);*/
/*shuffle_bytes((char *)&c0, 4);*/
/*shuffle_bytes((char *)&d0, 4);*/
printf("%.8x%.8x%.8x%.8x\n", a0, b0, c0, d0);
return EXIT_SUCCESS;
}
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