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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* main.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: cacharle <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/02/22 07:20:07 by cacharle #+# #+# */
/* Updated: 2020/07/27 17:04:37 by charles ### ########.fr */
/* */
/* ************************************************************************** */
#include "ft_ssl_md5.h"
const int g_shifts[64] = {
7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, // 0..15
5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, // 16..31
4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, // 32..47
6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, // 48..63
};
const uint32_t g_K[64] = {
0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, // 0.. 3
0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501, // 4.. 7
0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, // 8..11
0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, // 12..15
0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, // 16..19
0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8, // 20..23
0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, // 24..27
0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a, // 28..31
0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, // 32..35
0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, // 36..39
0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05, // 40..43
0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665, // 44..47
0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, // 48..51
0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1, // 52..55
0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, // 56..59
0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391, // 60..63
};
#define A_INIT 0x67452301
#define B_INIT 0xefcdab89
#define C_INIT 0x98badcfe
#define D_INIT 0x10325476
uint32_t leftrotate(uint32_t x, int s)
{
return (x << s) | (x >> (32 - s));
}
char *message_digest_md5(uint8_t *msg, size_t size)
{
// padding on 512 bit (64 bytes)
// format:
// 1 bit
// fill with zero start -> (end - 64 bit)
// 64 bit repr of the original len modulo 2^64 (ULONG_MAX)
uint8_t *tmp;
tmp = msg;
size_t pad_size = 32 - size % 32;
/* printf("%lu\n", size % 32); */
/* printf("%lu\n", 32 - size % 32); */
/* printf("%lu\n", pad_size); */
msg = malloc(size + pad_size);
ft_memcpy(msg, tmp, size);
ft_memset(msg + size, 0x0, pad_size);
msg[size] |= 1 << 7;
/* printf("%lu\n", size + pad_size - sizeof(uint64_t)); */
*((uint64_t*)(msg + size + pad_size - sizeof(uint64_t))) = (uint64_t)size;
size += pad_size;
/* printf("%lu: %s\n", size, msg); */
/* printf("|%02x%02x%02x%02x|\n", msg[24], msg[25], msg[26], msg[27]); */
uint32_t a, b, c, d;
// state initialized to predefined constants
// block of 512 bit
// 128 bit state (a, b, c, d)
// 4 rounds on each block (128 * 4 = 512)
uint32_t f;
int g;
int i;
size_t chunk_i;
chunk_i = 0;
while (chunk_i < size)
{
i = -1;
while (++i < 64)
{
if (i < 16)
{
f = (b & c) | ~(b & d);
g = i;
}
else if (i < 32)
{
f = (b & c) | (c & ~d);
g = (5 * i + 1) % 16;
}
else if (i < 48)
{
f = b ^ c ^ d;
g = (3 * i + 1) % 16;
}
else
{
f = c ^ (b | ~d);
g = (7 * i + 1) % 16;
}
f += a + g_K[i] + ((uint32_t*)(msg + chunk_i))[g];
a = d;
d = c;
c = b;
b += leftrotate(f, g_shifts[i]);
}
chunk_i += 32;
}
char *ret = malloc(33 * sizeof(char));
ret[32] = '\0';
sprintf(ret, "%08x%08x%08x%08x", a, b, c, d);
return (ret);
}
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