1 /*****************************************************************************
2 * md5.cpp: Calculate MD5 for SEI
3 *****************************************************************************
4 * Copyright (C) 2011-2012 x265 project
6 * Authors: Min Chen <chenm003@163.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation;
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
21 * This program is also available under a commercial proprietary license.
22 * For more information, contact us at chenm003@163.com.
23 *****************************************************************************/
29 // private x265 namespace
31 #ifndef ARCH_BIG_ENDIAN
32 #define byteReverse(buf, len) /* Nothing */
34 static void byteReverse(uint8_t_t
*buf
, unsigned int nSize
)
39 for (i
= 0; i
< nSize
; i
++)
41 tmp
= ((unsigned int)buf
[3] << 8 | buf
[2]) << 16 |
42 ((unsigned int)buf
[1] << 8 | buf
[0]);
43 *(uint32_t*)buf
= tmp
;
48 #endif // ifndef ARCH_BIG_ENDIAN
50 void MD5Transform(uint32_t *buf
, uint32_t *in
);
53 * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
54 * initialization constants.
56 void MD5Init(MD5Context
*ctx
)
58 ctx
->buf
[0] = 0x67452301;
59 ctx
->buf
[1] = 0xefcdab89;
60 ctx
->buf
[2] = 0x98badcfe;
61 ctx
->buf
[3] = 0x10325476;
68 * Update context to reflect the concatenation of another buffer full
71 void MD5Update(MD5Context
*ctx
, uint8_t *buf
, uint32_t len
)
78 if ((ctx
->bits
[0] = t
+ ((uint32_t)len
<< 3)) < t
)
79 ctx
->bits
[1]++; /* Carry from low to high */
80 ctx
->bits
[1] += len
>> 29;
82 t
= (t
>> 3) & 0x3F; /* Bytes already in shsInfo->data */
84 /* Handle any leading odd-sized chunks */
88 uint8_t *p
= (uint8_t*)ctx
->in
+ t
;
97 byteReverse(ctx
->in
, 16);
98 MD5Transform(ctx
->buf
, (uint32_t*)ctx
->in
);
102 /* Process data in 64-byte chunks */
106 memcpy(ctx
->in
, buf
, 64);
107 byteReverse(ctx
->in
, 16);
108 MD5Transform(ctx
->buf
, (uint32_t*)ctx
->in
);
113 /* Handle any remaining bytes of data. */
115 memcpy(ctx
->in
, buf
, len
);
119 * Final wrapup - pad to 64-byte boundary with the bit pattern
120 * 1 0* (64-bit count of bits processed, MSB-first)
122 void MD5Final(MD5Context
*ctx
, uint8_t *digest
)
127 /* Compute number of bytes mod 64 */
128 count
= (ctx
->bits
[0] >> 3) & 0x3F;
130 /* Set the first char of padding to 0x80. This is safe since there is
131 always at least one byte free */
135 /* Bytes of padding needed to make 64 bytes */
136 count
= 64 - 1 - count
;
138 /* Pad out to 56 mod 64 */
141 /* Two lots of padding: Pad the first block to 64 bytes */
143 byteReverse(ctx
->in
, 16);
144 MD5Transform(ctx
->buf
, (uint32_t*)ctx
->in
);
146 /* Now fill the next block with 56 bytes */
147 memset(ctx
->in
, 0, 56);
151 /* Pad block to 56 bytes */
152 memset(p
, 0, count
- 8);
154 byteReverse(ctx
->in
, 14);
156 /* Append length in bits and transform */
157 // CHECK_ME: Always use 32-bits operator
158 uint32_t *table
= (uint32_t*)&ctx
->in
;
159 table
[14] = ctx
->bits
[0];
160 table
[15] = ctx
->bits
[1];
162 MD5Transform(ctx
->buf
, (uint32_t*)ctx
->in
);
163 byteReverse((uint8_t*)ctx
->buf
, 4);
164 memcpy(digest
, ctx
->buf
, 16);
166 memset(ctx
, 0, sizeof(*ctx
)); /* In case it's sensitive */
169 /* The four core functions - F1 is optimized somewhat */
171 /* #define F1(x, y, z) (x & y | ~x & z) */
172 #define F1(x, y, z) (z ^ (x & (y ^ z)))
173 #define F2(x, y, z) F1(z, x, y)
174 #define F3(x, y, z) (x ^ y ^ z)
175 #define F4(x, y, z) (y ^ (x | ~z))
177 /* This is the central step in the MD5 algorithm. */
178 #define MD5STEP(f, w, x, y, z, data, s) \
179 (w += f(x, y, z) + data, w = w << s | w >> (32 - s), w += x)
182 * The core of the MD5 algorithm, this alters an existing MD5 hash to
183 * reflect the addition of 16 longwords of new data. MD5Update blocks
184 * the data and converts bytes into longwords for this routine.
186 void MD5Transform(uint32_t *buf
, uint32_t *in
)
188 register uint32_t a
, b
, c
, d
;
195 MD5STEP(F1
, a
, b
, c
, d
, in
[0] + 0xd76aa478, 7);
196 MD5STEP(F1
, d
, a
, b
, c
, in
[1] + 0xe8c7b756, 12);
197 MD5STEP(F1
, c
, d
, a
, b
, in
[2] + 0x242070db, 17);
198 MD5STEP(F1
, b
, c
, d
, a
, in
[3] + 0xc1bdceee, 22);
199 MD5STEP(F1
, a
, b
, c
, d
, in
[4] + 0xf57c0faf, 7);
200 MD5STEP(F1
, d
, a
, b
, c
, in
[5] + 0x4787c62a, 12);
201 MD5STEP(F1
, c
, d
, a
, b
, in
[6] + 0xa8304613, 17);
202 MD5STEP(F1
, b
, c
, d
, a
, in
[7] + 0xfd469501, 22);
203 MD5STEP(F1
, a
, b
, c
, d
, in
[8] + 0x698098d8, 7);
204 MD5STEP(F1
, d
, a
, b
, c
, in
[9] + 0x8b44f7af, 12);
205 MD5STEP(F1
, c
, d
, a
, b
, in
[10] + 0xffff5bb1, 17);
206 MD5STEP(F1
, b
, c
, d
, a
, in
[11] + 0x895cd7be, 22);
207 MD5STEP(F1
, a
, b
, c
, d
, in
[12] + 0x6b901122, 7);
208 MD5STEP(F1
, d
, a
, b
, c
, in
[13] + 0xfd987193, 12);
209 MD5STEP(F1
, c
, d
, a
, b
, in
[14] + 0xa679438e, 17);
210 MD5STEP(F1
, b
, c
, d
, a
, in
[15] + 0x49b40821, 22);
212 MD5STEP(F2
, a
, b
, c
, d
, in
[1] + 0xf61e2562, 5);
213 MD5STEP(F2
, d
, a
, b
, c
, in
[6] + 0xc040b340, 9);
214 MD5STEP(F2
, c
, d
, a
, b
, in
[11] + 0x265e5a51, 14);
215 MD5STEP(F2
, b
, c
, d
, a
, in
[0] + 0xe9b6c7aa, 20);
216 MD5STEP(F2
, a
, b
, c
, d
, in
[5] + 0xd62f105d, 5);
217 MD5STEP(F2
, d
, a
, b
, c
, in
[10] + 0x02441453, 9);
218 MD5STEP(F2
, c
, d
, a
, b
, in
[15] + 0xd8a1e681, 14);
219 MD5STEP(F2
, b
, c
, d
, a
, in
[4] + 0xe7d3fbc8, 20);
220 MD5STEP(F2
, a
, b
, c
, d
, in
[9] + 0x21e1cde6, 5);
221 MD5STEP(F2
, d
, a
, b
, c
, in
[14] + 0xc33707d6, 9);
222 MD5STEP(F2
, c
, d
, a
, b
, in
[3] + 0xf4d50d87, 14);
223 MD5STEP(F2
, b
, c
, d
, a
, in
[8] + 0x455a14ed, 20);
224 MD5STEP(F2
, a
, b
, c
, d
, in
[13] + 0xa9e3e905, 5);
225 MD5STEP(F2
, d
, a
, b
, c
, in
[2] + 0xfcefa3f8, 9);
226 MD5STEP(F2
, c
, d
, a
, b
, in
[7] + 0x676f02d9, 14);
227 MD5STEP(F2
, b
, c
, d
, a
, in
[12] + 0x8d2a4c8a, 20);
229 MD5STEP(F3
, a
, b
, c
, d
, in
[5] + 0xfffa3942, 4);
230 MD5STEP(F3
, d
, a
, b
, c
, in
[8] + 0x8771f681, 11);
231 MD5STEP(F3
, c
, d
, a
, b
, in
[11] + 0x6d9d6122, 16);
232 MD5STEP(F3
, b
, c
, d
, a
, in
[14] + 0xfde5380c, 23);
233 MD5STEP(F3
, a
, b
, c
, d
, in
[1] + 0xa4beea44, 4);
234 MD5STEP(F3
, d
, a
, b
, c
, in
[4] + 0x4bdecfa9, 11);
235 MD5STEP(F3
, c
, d
, a
, b
, in
[7] + 0xf6bb4b60, 16);
236 MD5STEP(F3
, b
, c
, d
, a
, in
[10] + 0xbebfbc70, 23);
237 MD5STEP(F3
, a
, b
, c
, d
, in
[13] + 0x289b7ec6, 4);
238 MD5STEP(F3
, d
, a
, b
, c
, in
[0] + 0xeaa127fa, 11);
239 MD5STEP(F3
, c
, d
, a
, b
, in
[3] + 0xd4ef3085, 16);
240 MD5STEP(F3
, b
, c
, d
, a
, in
[6] + 0x04881d05, 23);
241 MD5STEP(F3
, a
, b
, c
, d
, in
[9] + 0xd9d4d039, 4);
242 MD5STEP(F3
, d
, a
, b
, c
, in
[12] + 0xe6db99e5, 11);
243 MD5STEP(F3
, c
, d
, a
, b
, in
[15] + 0x1fa27cf8, 16);
244 MD5STEP(F3
, b
, c
, d
, a
, in
[2] + 0xc4ac5665, 23);
246 MD5STEP(F4
, a
, b
, c
, d
, in
[0] + 0xf4292244, 6);
247 MD5STEP(F4
, d
, a
, b
, c
, in
[7] + 0x432aff97, 10);
248 MD5STEP(F4
, c
, d
, a
, b
, in
[14] + 0xab9423a7, 15);
249 MD5STEP(F4
, b
, c
, d
, a
, in
[5] + 0xfc93a039, 21);
250 MD5STEP(F4
, a
, b
, c
, d
, in
[12] + 0x655b59c3, 6);
251 MD5STEP(F4
, d
, a
, b
, c
, in
[3] + 0x8f0ccc92, 10);
252 MD5STEP(F4
, c
, d
, a
, b
, in
[10] + 0xffeff47d, 15);
253 MD5STEP(F4
, b
, c
, d
, a
, in
[1] + 0x85845dd1, 21);
254 MD5STEP(F4
, a
, b
, c
, d
, in
[8] + 0x6fa87e4f, 6);
255 MD5STEP(F4
, d
, a
, b
, c
, in
[15] + 0xfe2ce6e0, 10);
256 MD5STEP(F4
, c
, d
, a
, b
, in
[6] + 0xa3014314, 15);
257 MD5STEP(F4
, b
, c
, d
, a
, in
[13] + 0x4e0811a1, 21);
258 MD5STEP(F4
, a
, b
, c
, d
, in
[4] + 0xf7537e82, 6);
259 MD5STEP(F4
, d
, a
, b
, c
, in
[11] + 0xbd3af235, 10);
260 MD5STEP(F4
, c
, d
, a
, b
, in
[2] + 0x2ad7d2bb, 15);
261 MD5STEP(F4
, b
, c
, d
, a
, in
[9] + 0xeb86d391, 21);