2017-03-01 08:02:28 +00:00
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/* MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
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*
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* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All rights reserved.
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* Code cleanup by pancake @ 2017
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*
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* License to copy and use this software is granted provided that it
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* is identified as the "RSA Data Security, Inc. MD5 Message-Digest
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* Algorithm" in all material mentioning or referencing this software
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* or this function.
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*
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* License is also granted to make and use derivative works provided
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* that such works are identified as "derived from the RSA Data
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* Security, Inc. MD5 Message-Digest Algorithm" in all material
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* mentioning or referencing the derived work.
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*
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* RSA Data Security, Inc. makes no representations concerning either
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* the merchantability of this software or the suitability of this
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* software for any particular purpose. It is provided "as is"
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* without express or implied warranty of any kind.
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*
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* These notices must be retained in any copies of any part of this
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* documentation and/or software.
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*/
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#include <r_hash.h>
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static void MD5Init (MD5_CTX *);
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static void MD5Update (MD5_CTX *, const ut8*, unsigned int);
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static void MD5Final (ut8 [16], MD5_CTX *);
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/* F, G, H and I are basic MD5 functions. */
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#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
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#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
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#define H(x, y, z) ((x) ^ (y) ^ (z))
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#define I(x, y, z) ((y) ^ ((x) | (~z)))
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// ROTATE_LEFT rotates x left n bits.
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#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
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/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
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* Rotation is separate from addition to prevent recomputation. */
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#define FF(a, b, c, d, x, s, ac) { \
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(a) += F ((b), (c), (d)) + (x) + (ut32)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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#define GG(a, b, c, d, x, s, ac) { \
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(a) += G ((b), (c), (d)) + (x) + (ut32)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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#define HH(a, b, c, d, x, s, ac) { \
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(a) += H ((b), (c), (d)) + (x) + (ut32)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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#define II(a, b, c, d, x, s, ac) { \
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(a) += I ((b), (c), (d)) + (x) + (ut32)(ac); \
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(a) = ROTATE_LEFT ((a), (s)); \
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(a) += (b); \
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}
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/* Encodes input (ut32) into output (ut8). Assumes len is a multiple of 4. */
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2017-03-05 19:44:09 +00:00
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static void Encode(ut8 *output, ut32 *input, ut32 len) {
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2017-03-01 08:02:28 +00:00
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ut32 i, j;
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for (i = 0, j = 0; j < len; i++, j += 4) {
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output[j] = (ut8)(input[i] & 0xff);
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output[j+1] = (ut8)((input[i] >> 8) & 0xff);
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output[j+2] = (ut8)((input[i] >> 16) & 0xff);
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output[j+3] = (ut8)((input[i] >> 24) & 0xff);
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}
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}
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/* Decodes input (ut8) into output (ut32). Assumes len is a multiple of 4 */
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2017-03-05 19:44:09 +00:00
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static void Decode(ut32 *output, const ut8 *input, ut32 len) {
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2017-03-01 08:02:28 +00:00
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ut32 i, j;
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for (i = 0, j = 0; j < len; i++, j += 4) {
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2017-03-05 19:44:09 +00:00
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output[i] = ((ut32)input[j]) | (((ut32)input[j + 1]) << 8) |
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(((ut32)input[j + 2]) << 16) |
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(((ut32)input[j + 3]) << 24);
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2017-03-01 08:02:28 +00:00
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}
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}
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/* MD5 basic transformation. Transforms state based on block */
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2017-03-05 19:44:09 +00:00
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static void MD5Transform(ut32 state[4], const ut8 block[64]) {
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2017-03-01 08:02:28 +00:00
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ut32 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
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Decode (x, block, 64);
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/* Round 1 */
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FF (a, b, c, d, x[ 0], 7, 0xd76aa478);
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FF (d, a, b, c, x[ 1], 12, 0xe8c7b756);
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FF (c, d, a, b, x[ 2], 17, 0x242070db);
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FF (b, c, d, a, x[ 3], 22, 0xc1bdceee);
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FF (a, b, c, d, x[ 4], 7, 0xf57c0faf);
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FF (d, a, b, c, x[ 5], 12, 0x4787c62a);
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FF (c, d, a, b, x[ 6], 17, 0xa8304613);
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FF (b, c, d, a, x[ 7], 22, 0xfd469501);
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FF (a, b, c, d, x[ 8], 7, 0x698098d8);
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FF (d, a, b, c, x[ 9], 12, 0x8b44f7af);
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FF (c, d, a, b, x[10], 17, 0xffff5bb1);
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FF (b, c, d, a, x[11], 22, 0x895cd7be);
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FF (a, b, c, d, x[12], 7, 0x6b901122);
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FF (d, a, b, c, x[13], 12, 0xfd987193);
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FF (c, d, a, b, x[14], 17, 0xa679438e);
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FF (b, c, d, a, x[15], 22, 0x49b40821);
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/* Round 2 */
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GG (a, b, c, d, x[ 1], 5, 0xf61e2562);
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GG (d, a, b, c, x[ 6], 9, 0xc040b340);
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GG (c, d, a, b, x[11], 14, 0x265e5a51);
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GG (b, c, d, a, x[ 0], 20, 0xe9b6c7aa);
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GG (a, b, c, d, x[ 5], 5, 0xd62f105d);
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GG (d, a, b, c, x[10], 9, 0x2441453);
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GG (c, d, a, b, x[15], 14, 0xd8a1e681);
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GG (b, c, d, a, x[ 4], 20, 0xe7d3fbc8);
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GG (a, b, c, d, x[ 9], 5, 0x21e1cde6);
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GG (d, a, b, c, x[14], 9, 0xc33707d6);
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GG (c, d, a, b, x[ 3], 14, 0xf4d50d87);
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GG (b, c, d, a, x[ 8], 20, 0x455a14ed);
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GG (a, b, c, d, x[13], 5, 0xa9e3e905);
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GG (d, a, b, c, x[ 2], 9, 0xfcefa3f8);
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GG (c, d, a, b, x[ 7], 14, 0x676f02d9);
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GG (b, c, d, a, x[12], 20, 0x8d2a4c8a);
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/* Round 3 */
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HH (a, b, c, d, x[ 5], 4, 0xfffa3942);
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HH (d, a, b, c, x[ 8], 11, 0x8771f681);
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HH (c, d, a, b, x[11], 16, 0x6d9d6122);
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HH (b, c, d, a, x[14], 23, 0xfde5380c);
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HH (a, b, c, d, x[ 1], 4, 0xa4beea44);
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HH (d, a, b, c, x[ 4], 11, 0x4bdecfa9);
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HH (c, d, a, b, x[ 7], 16, 0xf6bb4b60);
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HH (b, c, d, a, x[10], 23, 0xbebfbc70);
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HH (a, b, c, d, x[13], 4, 0x289b7ec6);
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HH (d, a, b, c, x[ 0], 11, 0xeaa127fa);
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HH (c, d, a, b, x[ 3], 16, 0xd4ef3085);
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HH (b, c, d, a, x[ 6], 23, 0x4881d05);
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HH (a, b, c, d, x[ 9], 4, 0xd9d4d039);
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HH (d, a, b, c, x[12], 11, 0xe6db99e5);
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HH (c, d, a, b, x[15], 16, 0x1fa27cf8);
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HH (b, c, d, a, x[ 2], 23, 0xc4ac5665);
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/* Round 4 */
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II (a, b, c, d, x[ 0], 6, 0xf4292244);
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II (d, a, b, c, x[ 7], 10, 0x432aff97);
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II (c, d, a, b, x[14], 15, 0xab9423a7);
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II (b, c, d, a, x[ 5], 21, 0xfc93a039);
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II (a, b, c, d, x[12], 6, 0x655b59c3);
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II (d, a, b, c, x[ 3], 10, 0x8f0ccc92);
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II (c, d, a, b, x[10], 15, 0xffeff47d);
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II (b, c, d, a, x[ 1], 21, 0x85845dd1);
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II (a, b, c, d, x[ 8], 6, 0x6fa87e4f);
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II (d, a, b, c, x[15], 10, 0xfe2ce6e0);
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II (c, d, a, b, x[ 6], 15, 0xa3014314);
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II (b, c, d, a, x[13], 21, 0x4e0811a1);
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II (a, b, c, d, x[ 4], 6, 0xf7537e82);
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II (d, a, b, c, x[11], 10, 0xbd3af235);
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II (c, d, a, b, x[ 2], 15, 0x2ad7d2bb);
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II (b, c, d, a, x[ 9], 21, 0xeb86d391);
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state[0] += a;
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state[1] += b;
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state[2] += c;
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state[3] += d;
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/* Zeroize sensitive information. check if compiler optimizes out this */
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memset ((void*)x, 0, sizeof (x));
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}
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static const ut8 PADDING[64] = {
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0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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/* MD5 initialization. Begins an MD5 operation, writing a new context */
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2017-03-05 19:44:09 +00:00
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static void MD5Init(R_MD5_CTX *context) {
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2017-03-01 08:02:28 +00:00
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if (context) {
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context->count[0] = context->count[1] = 0;
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context->state[0] = 0x67452301;
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context->state[1] = 0xefcdab89;
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context->state[2] = 0x98badcfe;
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context->state[3] = 0x10325476;
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}
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}
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/* MD5 block update operation. Continues an MD5 message-digest operation,
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* processing another message block, and updating the context */
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2017-03-05 19:44:09 +00:00
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static void MD5Update(R_MD5_CTX *context, const ut8 *input, ut32 inputLen) {
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ut32 i;
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/* Compute number of bytes mod 64 */
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ut32 index = (ut32)((context->count[0] >> 3) & 0x3F);
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/* Update number of bits */
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if ((context->count[0] += ((ut32)inputLen << 3)) < ((ut32)inputLen << 3)) {
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context->count[1]++;
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}
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context->count[1] += ((ut32)inputLen >> 29);
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ut32 partLen = 64 - index;
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// Transform as many times as possible
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if (inputLen >= partLen) {
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memmove ((void*)&context->buffer[index], (void*)input, partLen);
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MD5Transform (context->state, context->buffer);
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for (i = partLen; i + 63 < inputLen; i += 64) {
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MD5Transform (context->state, &input[i]);
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}
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index = 0;
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} else {
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i = 0;
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}
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// remaining input
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memmove ((void*)&context->buffer[index], (void*)&input[i], inputLen - i);
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}
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static void MD5Final (ut8 digest[16], R_MD5_CTX *context) {
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ut8 bits[8];
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/* Save number of bits */
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Encode (bits, context->count, 8);
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/* Pad out to 56 mod 64. */
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ut32 index = (ut32)((context->count[0] >> 3) & 0x3f);
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ut32 padLen = (index < 56) ? (56 - index) : (120 - index);
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MD5Update (context, PADDING, padLen);
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/* Append length (before padding) */
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MD5Update (context, bits, 8);
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/* Store state in digest */
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Encode (digest, context->state, 16);
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/* Zeroize sensitive information. */
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memset ((void*)context, 0, sizeof (*context));
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}
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R_API ut8 *r_hash_do_md5(RHash *ctx, const ut8 *input, int len) {
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if (len < 0) {
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if (len == -1) {
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MD5Init (&ctx->md5);
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} else if (len == -2) {
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MD5Final (ctx->digest, &ctx->md5);
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}
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return NULL;
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}
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if (ctx->rst) {
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MD5Init (&ctx->md5);
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}
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if (len > 0) {
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MD5Update (&ctx->md5, input, len);
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} else {
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MD5Update (&ctx->md5, (const ut8 *) "", 0);
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}
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2017-03-05 19:44:09 +00:00
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if (ctx->rst) {
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MD5Final (ctx->digest, &ctx->md5);
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}
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return ctx->digest;
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}
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