[1] | 1 | #include "MD5.h"
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| 2 | #include <stdlib.h>
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| 3 | #include <stdio.h>
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| 4 | #include "string.h"
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| 5 |
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| 6 | // Constants are the integer part of the sines of integers (in radians) * 2^32.
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| 7 | const uint32_t k[64] = {
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| 8 | 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee ,
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| 9 | 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501 ,
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| 10 | 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be ,
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| 11 | 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821 ,
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| 12 | 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa ,
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| 13 | 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8 ,
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| 14 | 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed ,
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| 15 | 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a ,
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| 16 | 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c ,
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| 17 | 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70 ,
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| 18 | 0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05 ,
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| 19 | 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665 ,
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| 20 | 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039 ,
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| 21 | 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1 ,
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| 22 | 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1 ,
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| 23 | 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391 };
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| 24 |
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| 25 | #define LEFTROTATE(x, c) (((x) << (c)) | ((x) >> (32 - (c))))
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| 26 |
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| 27 | #define PUT_ULONG_LE(n,b,i) \
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| 28 | { \
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| 29 | (b)[(i) ] = (unsigned char) ( (n) ); \
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| 30 | (b)[(i) + 1] = (unsigned char) ( (n) >> 8 ); \
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| 31 | (b)[(i) + 2] = (unsigned char) ( (n) >> 16 ); \
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| 32 | (b)[(i) + 3] = (unsigned char) ( (n) >> 24 ); \
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| 33 | }
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| 34 |
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| 35 |
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| 36 |
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| 37 | void md5(uint8_t *initial_msg, size_t initial_len, uint8_t *hash) {
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| 38 |
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| 39 | uint8_t *msg = NULL;
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| 40 | int new_len;
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| 41 | uint32_t bits_len;
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| 42 | int offset;
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| 43 | uint32_t *w;
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| 44 | uint32_t a, b, c, d, i, f, g, temp;
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| 45 |
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| 46 | const uint32_t r[] = {7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22,
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| 47 | 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20,
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| 48 | 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,
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| 49 | 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21};
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| 50 |
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| 51 | uint32_t h0 = 0x67452301;
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| 52 | uint32_t h1 = 0xefcdab89;
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| 53 | uint32_t h2 = 0x98badcfe;
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| 54 | uint32_t h3 = 0x10325476;
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| 55 |
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| 56 |
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| 57 | for(new_len = initial_len * 8 + 1; new_len % 512 != 448; new_len++);
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| 58 | new_len /= 8;
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| 59 |
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| 60 | msg = (uint8_t*)calloc(new_len + 64, 1); // also appends "0" bits
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| 61 | // (we alloc also 64 extra bytes...)
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| 62 | memcpy(msg, initial_msg, initial_len);
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| 63 | msg[initial_len] = 128; // write the "1" bit
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| 64 |
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| 65 | bits_len = 8*initial_len; // note, we append the len
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| 66 | memcpy(msg + new_len, &bits_len, 4); // in bits at the end of the buffer
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| 67 |
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| 68 | for(offset=0; offset<new_len; offset += (512/8)) {
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| 69 |
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| 70 | // break chunk into sixteen 32-bit words w[j], 0 ? j ? 15
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| 71 | w = (uint32_t *) (msg + offset);
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| 72 |
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| 73 | // Initialize hash value for this chunk:
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| 74 | a = h0;
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| 75 | b = h1;
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| 76 | c = h2;
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| 77 | d = h3;
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| 78 |
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| 79 | // Main loop:
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| 80 | for(i = 0; i<64; i++) {
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| 81 |
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| 82 | if (i < 16) {
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| 83 | f = (b & c) | ((~b) & d);
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| 84 | g = i;
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| 85 | } else if (i < 32) {
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| 86 | f = (d & b) | ((~d) & c);
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| 87 | g = (5*i + 1) % 16;
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| 88 | } else if (i < 48) {
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| 89 | f = b ^ c ^ d;
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| 90 | g = (3*i + 5) % 16;
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| 91 | } else {
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| 92 | f = c ^ (b | (~d));
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| 93 | g = (7*i) % 16;
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| 94 | }
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| 95 | temp = d;
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| 96 | d = c;
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| 97 | c = b;
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| 98 | b = b + LEFTROTATE((a + f + k[i] + w[g]), r[i]);
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| 99 | a = temp;
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| 100 |
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| 101 | }
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| 102 | h0 += a;
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| 103 | h1 += b;
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| 104 | h2 += c;
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| 105 | h3 += d;
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| 106 | }
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| 107 |
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| 108 | PUT_ULONG_LE(h0, hash, 0 );
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| 109 | PUT_ULONG_LE(h1, hash, 4 );
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| 110 | PUT_ULONG_LE(h2, hash, 8 );
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| 111 | PUT_ULONG_LE(h3, hash, 12 );
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| 112 |
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| 113 | free(msg);
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| 114 | }
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