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35 /* This software has been altered by GROMACS for its use, including
36 * the use of GMX_INTEGER_BIG_ENDIAN, and the renaming of the
37 * functions md5_init, md5_append and md5_finish to have a gmx_ prefix
38 * (to avoid name clashes). */
41 #ifdef GMX_INTEGER_BIG_ENDIAN
42 #define ARCH_IS_BIG_ENDIAN 1
44 #define ARCH_IS_BIG_ENDIAN 0
48 Copyright (C) 1999, 2002 Aladdin Enterprises. All rights reserved.
50 This software is provided 'as-is', without any express or implied
51 warranty. In no event will the authors be held liable for any damages
52 arising from the use of this software.
54 Permission is granted to anyone to use this software for any purpose,
55 including commercial applications, and to alter it and redistribute it
56 freely, subject to the following restrictions:
58 1. The origin of this software must not be misrepresented; you must not
59 claim that you wrote the original software. If you use this software
60 in a product, an acknowledgment in the product documentation would be
61 appreciated but is not required.
62 2. Altered source versions must be plainly marked as such, and must not be
63 misrepresented as being the original software.
64 3. This notice may not be removed or altered from any source distribution.
71 Independent implementation of MD5 (RFC 1321).
73 This code implements the MD5 Algorithm defined in RFC 1321, whose
75 http://www.ietf.org/rfc/rfc1321.txt
76 The code is derived from the text of the RFC, including the test suite
77 (section A.5) but excluding the rest of Appendix A. It does not include
78 any code or documentation that is identified in the RFC as being
81 The original and principal author of md5.c is L. Peter Deutsch
82 <ghost@aladdin.com>. Other authors are noted in the change history
83 that follows (in reverse chronological order):
85 2002-04-13 lpd Clarified derivation from RFC 1321; now handles byte order
86 either statically or dynamically; added missing #include <string.h>
88 2002-03-11 lpd Corrected argument list for main(), and added int return
89 type, in test program and T value program.
90 2002-02-21 lpd Added missing #include <stdio.h> in test program.
91 2000-07-03 lpd Patched to eliminate warnings about "constant is
92 unsigned in ANSI C, signed in traditional"; made test program
94 1999-11-04 lpd Edited comments slightly for automatic TOC extraction.
95 1999-10-18 lpd Fixed typo in header comment (ansi2knr rather than md5).
96 1999-05-03 lpd Original version.
102 #undef BYTE_ORDER /* 1 = big-endian, -1 = little-endian, 0 = unknown */
103 #ifdef ARCH_IS_BIG_ENDIAN
104 # define BYTE_ORDER (ARCH_IS_BIG_ENDIAN ? 1 : -1)
106 # define BYTE_ORDER 0
109 #define T_MASK ((md5_word_t) ~0)
110 #define T1 /* 0xd76aa478 */ (T_MASK ^ 0x28955b87)
111 #define T2 /* 0xe8c7b756 */ (T_MASK ^ 0x173848a9)
112 #define T3 0x242070db
113 #define T4 /* 0xc1bdceee */ (T_MASK ^ 0x3e423111)
114 #define T5 /* 0xf57c0faf */ (T_MASK ^ 0x0a83f050)
115 #define T6 0x4787c62a
116 #define T7 /* 0xa8304613 */ (T_MASK ^ 0x57cfb9ec)
117 #define T8 /* 0xfd469501 */ (T_MASK ^ 0x02b96afe)
118 #define T9 0x698098d8
119 #define T10 /* 0x8b44f7af */ (T_MASK ^ 0x74bb0850)
120 #define T11 /* 0xffff5bb1 */ (T_MASK ^ 0x0000a44e)
121 #define T12 /* 0x895cd7be */ (T_MASK ^ 0x76a32841)
122 #define T13 0x6b901122
123 #define T14 /* 0xfd987193 */ (T_MASK ^ 0x02678e6c)
124 #define T15 /* 0xa679438e */ (T_MASK ^ 0x5986bc71)
125 #define T16 0x49b40821
126 #define T17 /* 0xf61e2562 */ (T_MASK ^ 0x09e1da9d)
127 #define T18 /* 0xc040b340 */ (T_MASK ^ 0x3fbf4cbf)
128 #define T19 0x265e5a51
129 #define T20 /* 0xe9b6c7aa */ (T_MASK ^ 0x16493855)
130 #define T21 /* 0xd62f105d */ (T_MASK ^ 0x29d0efa2)
131 #define T22 0x02441453
132 #define T23 /* 0xd8a1e681 */ (T_MASK ^ 0x275e197e)
133 #define T24 /* 0xe7d3fbc8 */ (T_MASK ^ 0x182c0437)
134 #define T25 0x21e1cde6
135 #define T26 /* 0xc33707d6 */ (T_MASK ^ 0x3cc8f829)
136 #define T27 /* 0xf4d50d87 */ (T_MASK ^ 0x0b2af278)
137 #define T28 0x455a14ed
138 #define T29 /* 0xa9e3e905 */ (T_MASK ^ 0x561c16fa)
139 #define T30 /* 0xfcefa3f8 */ (T_MASK ^ 0x03105c07)
140 #define T31 0x676f02d9
141 #define T32 /* 0x8d2a4c8a */ (T_MASK ^ 0x72d5b375)
142 #define T33 /* 0xfffa3942 */ (T_MASK ^ 0x0005c6bd)
143 #define T34 /* 0x8771f681 */ (T_MASK ^ 0x788e097e)
144 #define T35 0x6d9d6122
145 #define T36 /* 0xfde5380c */ (T_MASK ^ 0x021ac7f3)
146 #define T37 /* 0xa4beea44 */ (T_MASK ^ 0x5b4115bb)
147 #define T38 0x4bdecfa9
148 #define T39 /* 0xf6bb4b60 */ (T_MASK ^ 0x0944b49f)
149 #define T40 /* 0xbebfbc70 */ (T_MASK ^ 0x4140438f)
150 #define T41 0x289b7ec6
151 #define T42 /* 0xeaa127fa */ (T_MASK ^ 0x155ed805)
152 #define T43 /* 0xd4ef3085 */ (T_MASK ^ 0x2b10cf7a)
153 #define T44 0x04881d05
154 #define T45 /* 0xd9d4d039 */ (T_MASK ^ 0x262b2fc6)
155 #define T46 /* 0xe6db99e5 */ (T_MASK ^ 0x1924661a)
156 #define T47 0x1fa27cf8
157 #define T48 /* 0xc4ac5665 */ (T_MASK ^ 0x3b53a99a)
158 #define T49 /* 0xf4292244 */ (T_MASK ^ 0x0bd6ddbb)
159 #define T50 0x432aff97
160 #define T51 /* 0xab9423a7 */ (T_MASK ^ 0x546bdc58)
161 #define T52 /* 0xfc93a039 */ (T_MASK ^ 0x036c5fc6)
162 #define T53 0x655b59c3
163 #define T54 /* 0x8f0ccc92 */ (T_MASK ^ 0x70f3336d)
164 #define T55 /* 0xffeff47d */ (T_MASK ^ 0x00100b82)
165 #define T56 /* 0x85845dd1 */ (T_MASK ^ 0x7a7ba22e)
166 #define T57 0x6fa87e4f
167 #define T58 /* 0xfe2ce6e0 */ (T_MASK ^ 0x01d3191f)
168 #define T59 /* 0xa3014314 */ (T_MASK ^ 0x5cfebceb)
169 #define T60 0x4e0811a1
170 #define T61 /* 0xf7537e82 */ (T_MASK ^ 0x08ac817d)
171 #define T62 /* 0xbd3af235 */ (T_MASK ^ 0x42c50dca)
172 #define T63 0x2ad7d2bb
173 #define T64 /* 0xeb86d391 */ (T_MASK ^ 0x14792c6e)
177 md5_process(md5_state_t *pms, const md5_byte_t *data /*[64]*/)
180 a = pms->abcd[0], b = pms->abcd[1],
181 c = pms->abcd[2], d = pms->abcd[3];
184 /* Define storage only for big-endian CPUs. */
187 /* Define storage for little-endian or both types of CPUs. */
195 * Determine dynamically whether this is a big-endian or
196 * little-endian machine, since we can use a more efficient
197 * algorithm on the latter.
199 static const int w = 1;
201 if (*((const md5_byte_t *)&w)) /* dynamic little-endian */
203 #if BYTE_ORDER <= 0 /* little-endian */
206 * On little-endian machines, we can process properly aligned
207 * data without copying it.
209 if (!((data - (const md5_byte_t *)0) & 3))
211 /* data are properly aligned */
212 X = (const md5_word_t *)data;
217 memcpy(xbuf, data, 64);
223 else /* dynamic big-endian */
225 #if BYTE_ORDER >= 0 /* big-endian */
228 * On big-endian machines, we must arrange the bytes in the
231 const md5_byte_t *xp = data;
235 X = xbuf; /* (dynamic only) */
237 # define xbuf X /* (static only) */
239 for (i = 0; i < 16; ++i, xp += 4)
241 xbuf[i] = xp[0] + (xp[1] << 8) + (xp[2] << 16) + (xp[3] << 24);
247 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32 - (n))))
250 /* Let [abcd k s i] denote the operation
251 a = b + ((a + F(b,c,d) + X[k] + T[i]) <<< s). */
252 #define F(x, y, z) (((x) & (y)) | (~(x) & (z)))
253 #define SET(a, b, c, d, k, s, Ti) \
254 t = a + F(b, c, d) + X[k] + Ti; \
255 a = ROTATE_LEFT(t, s) + b
256 /* Do the following 16 operations. */
257 SET(a, b, c, d, 0, 7, T1);
258 SET(d, a, b, c, 1, 12, T2);
259 SET(c, d, a, b, 2, 17, T3);
260 SET(b, c, d, a, 3, 22, T4);
261 SET(a, b, c, d, 4, 7, T5);
262 SET(d, a, b, c, 5, 12, T6);
263 SET(c, d, a, b, 6, 17, T7);
264 SET(b, c, d, a, 7, 22, T8);
265 SET(a, b, c, d, 8, 7, T9);
266 SET(d, a, b, c, 9, 12, T10);
267 SET(c, d, a, b, 10, 17, T11);
268 SET(b, c, d, a, 11, 22, T12);
269 SET(a, b, c, d, 12, 7, T13);
270 SET(d, a, b, c, 13, 12, T14);
271 SET(c, d, a, b, 14, 17, T15);
272 SET(b, c, d, a, 15, 22, T16);
276 /* Let [abcd k s i] denote the operation
277 a = b + ((a + G(b,c,d) + X[k] + T[i]) <<< s). */
278 #define G(x, y, z) (((x) & (z)) | ((y) & ~(z)))
279 #define SET(a, b, c, d, k, s, Ti) \
280 t = a + G(b, c, d) + X[k] + Ti; \
281 a = ROTATE_LEFT(t, s) + b
282 /* Do the following 16 operations. */
283 SET(a, b, c, d, 1, 5, T17);
284 SET(d, a, b, c, 6, 9, T18);
285 SET(c, d, a, b, 11, 14, T19);
286 SET(b, c, d, a, 0, 20, T20);
287 SET(a, b, c, d, 5, 5, T21);
288 SET(d, a, b, c, 10, 9, T22);
289 SET(c, d, a, b, 15, 14, T23);
290 SET(b, c, d, a, 4, 20, T24);
291 SET(a, b, c, d, 9, 5, T25);
292 SET(d, a, b, c, 14, 9, T26);
293 SET(c, d, a, b, 3, 14, T27);
294 SET(b, c, d, a, 8, 20, T28);
295 SET(a, b, c, d, 13, 5, T29);
296 SET(d, a, b, c, 2, 9, T30);
297 SET(c, d, a, b, 7, 14, T31);
298 SET(b, c, d, a, 12, 20, T32);
302 /* Let [abcd k s t] denote the operation
303 a = b + ((a + H(b,c,d) + X[k] + T[i]) <<< s). */
304 #define H(x, y, z) ((x) ^ (y) ^ (z))
305 #define SET(a, b, c, d, k, s, Ti) \
306 t = a + H(b, c, d) + X[k] + Ti; \
307 a = ROTATE_LEFT(t, s) + b
308 /* Do the following 16 operations. */
309 SET(a, b, c, d, 5, 4, T33);
310 SET(d, a, b, c, 8, 11, T34);
311 SET(c, d, a, b, 11, 16, T35);
312 SET(b, c, d, a, 14, 23, T36);
313 SET(a, b, c, d, 1, 4, T37);
314 SET(d, a, b, c, 4, 11, T38);
315 SET(c, d, a, b, 7, 16, T39);
316 SET(b, c, d, a, 10, 23, T40);
317 SET(a, b, c, d, 13, 4, T41);
318 SET(d, a, b, c, 0, 11, T42);
319 SET(c, d, a, b, 3, 16, T43);
320 SET(b, c, d, a, 6, 23, T44);
321 SET(a, b, c, d, 9, 4, T45);
322 SET(d, a, b, c, 12, 11, T46);
323 SET(c, d, a, b, 15, 16, T47);
324 SET(b, c, d, a, 2, 23, T48);
328 /* Let [abcd k s t] denote the operation
329 a = b + ((a + I(b,c,d) + X[k] + T[i]) <<< s). */
330 #define I(x, y, z) ((y) ^ ((x) | ~(z)))
331 #define SET(a, b, c, d, k, s, Ti) \
332 t = a + I(b, c, d) + X[k] + Ti; \
333 a = ROTATE_LEFT(t, s) + b
334 /* Do the following 16 operations. */
335 SET(a, b, c, d, 0, 6, T49);
336 SET(d, a, b, c, 7, 10, T50);
337 SET(c, d, a, b, 14, 15, T51);
338 SET(b, c, d, a, 5, 21, T52);
339 SET(a, b, c, d, 12, 6, T53);
340 SET(d, a, b, c, 3, 10, T54);
341 SET(c, d, a, b, 10, 15, T55);
342 SET(b, c, d, a, 1, 21, T56);
343 SET(a, b, c, d, 8, 6, T57);
344 SET(d, a, b, c, 15, 10, T58);
345 SET(c, d, a, b, 6, 15, T59);
346 SET(b, c, d, a, 13, 21, T60);
347 SET(a, b, c, d, 4, 6, T61);
348 SET(d, a, b, c, 11, 10, T62);
349 SET(c, d, a, b, 2, 15, T63);
350 SET(b, c, d, a, 9, 21, T64);
353 /* Then perform the following additions. (That is increment each
354 of the four registers by the value it had before this block
363 gmx_md5_init(md5_state_t *pms)
365 pms->count[0] = pms->count[1] = 0;
366 pms->abcd[0] = 0x67452301;
367 pms->abcd[1] = /*0xefcdab89*/ T_MASK ^ 0x10325476;
368 pms->abcd[2] = /*0x98badcfe*/ T_MASK ^ 0x67452301;
369 pms->abcd[3] = 0x10325476;
373 gmx_md5_append(md5_state_t *pms, const md5_byte_t *data, int nbytes)
375 const md5_byte_t *p = data;
377 int offset = (pms->count[0] >> 3) & 63;
378 md5_word_t nbits = (md5_word_t)(nbytes << 3);
385 /* Update the message length. */
386 pms->count[1] += nbytes >> 29;
387 pms->count[0] += nbits;
388 if (pms->count[0] < nbits)
393 /* Process an initial partial block. */
396 int copy = (offset + nbytes > 64 ? 64 - offset : nbytes);
398 memcpy(pms->buf + offset, p, copy);
399 if (offset + copy < 64)
405 md5_process(pms, pms->buf);
408 /* Process full blocks. */
409 for (; left >= 64; p += 64, left -= 64)
414 /* Process a final partial block. */
417 memcpy(pms->buf, p, left);
422 gmx_md5_finish(md5_state_t *pms, md5_byte_t digest[16])
424 static const md5_byte_t pad[64] = {
425 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
426 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
427 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
428 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
433 /* Save the length before padding. */
434 for (i = 0; i < 8; ++i)
436 data[i] = (md5_byte_t)(pms->count[i >> 2] >> ((i & 3) << 3));
438 /* Pad to 56 bytes mod 64. */
439 gmx_md5_append(pms, pad, ((55 - (pms->count[0] >> 3)) & 63) + 1);
440 /* Append the length. */
441 gmx_md5_append(pms, data, 8);
442 for (i = 0; i < 16; ++i)
444 digest[i] = (md5_byte_t)(pms->abcd[i >> 2] >> ((i & 3) << 3));