ref: 0c7b309f7f275f7cfee99bddea8b645c4c8f5f7f
dir: /tools/md5.c/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include "common.h"
static const int s[64] = {
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,
};
static const uint32_t K[64] = {
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,
};
#define rotate_left_32(value, by) \
((((value) << (by)) & 0xffffffff) | ((value) >> (32 - (by))))
void md5_wikipedia(uint8_t *data, int length, uint8_t *result) {
uint8_t *message = calloc(length + 64, sizeof(uint8_t));
memcpy(message, data, length);
int64_t orig_bitlength = length * 8;
message[length++] |= 1 << 7;
while (length % 64 != (64 - 8)) {
length++;
}
for (int i = 0; i < 8; i++) {
message[length++] = (orig_bitlength >> (i * 8)) & 0xff;
}
int a0 = 0x67452301;
int b0 = 0xefcdab89;
int c0 = 0x98badcfe;
int d0 = 0x10325476;
for (int start = 0; start < length; start += 64) {
uint32_t M[16];
for (int j = 0; j < 16; j++) {
uint8_t *word = &message[start + j * 4];
M[j] = *word++;
M[j] |= *word++ << 8;
M[j] |= *word++ << 16;
M[j] |= *word++ << 24;
}
int A = a0;
int B = b0;
int C = c0;
int D = d0;
for (int i = 0; i < 64; i++) {
int F, g;
switch (i / 16) {
case 0:
F = (B & C) | (~B & D);
g = i;
break;
case 1:
F = (D & B) | (~D & C);
g = (5 * i + 1) % 16;
break;
case 2:
F = B ^ C ^ D;
g = (3 * i + 5) % 16;
break;
case 3:
F = C ^ (B | ~D);
g = (7 * i) % 16;
break;
}
int e = D;
D = C;
C = B;
B = B + rotate_left_32(A + F + K[i] + M[g], s[i]);
A = e;
}
a0 += A;
b0 += B;
c0 += C;
d0 += D;
}
int values[] = {a0, b0, c0, d0};
for (int i = 0; i < 16; i++) {
int value = values[i >> 2];
int shift = (i % 4) * 8;
result[i] = (value >> shift) & 0xff;
}
free(message);
}
int main(int argc, char *argv[]) {
if (argc < 2) {
exit(1);
}
char *infile = argv[1];
int size;
uint8_t *data = read_u8(infile, &size);
uint8_t result[16];
md5_wikipedia(data, size, result);
for (int i = 0; i < 16; i++) {
printf("%02x", result[i]);
}
printf("\n");
}