1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* dbus-md5.c md5 implementation (based on L Peter Deutsch implementation)
4 * Copyright (C) 2003 Red Hat Inc.
5 * Copyright (C) 1999, 2000 Aladdin Enterprises. All rights reserved.
7 * This software is provided 'as-is', without any express or implied
8 * warranty. In no event will the authors be held liable for any damages
9 * arising from the use of this software.
11 * Permission is granted to anyone to use this software for any purpose,
12 * including commercial applications, and to alter it and redistribute it
13 * freely, subject to the following restrictions:
15 * 1. The origin of this software must not be misrepresented; you must not
16 * claim that you wrote the original software. If you use this software
17 * in a product, an acknowledgment in the product documentation would be
18 * appreciated but is not required.
19 * 2. Altered source versions must be plainly marked as such, and must not be
20 * misrepresented as being the original software.
21 * 3. This notice may not be removed or altered from any source distribution.
27 * Independent implementation of MD5 (RFC 1321).
29 * This code implements the MD5 Algorithm defined in RFC 1321.
30 * It is derived directly from the text of the RFC and not from the
31 * reference implementation.
33 * The original and principal author of md5.c is L. Peter Deutsch
34 * <ghost@aladdin.com>.
38 #include "dbus-internals.h"
43 * @defgroup DBusMD5 MD5 implementation
44 * @ingroup DBusInternals
47 * Types and functions related to computing MD5 sums.
51 * @defgroup DBusMD5Internals MD5 implementation details
52 * @ingroup DBusInternals
53 * @brief Internals of MD5 implementation.
55 * The implementation of MD5 (see http://www.ietf.org/rfc/rfc1321.txt).
56 * This MD5 implementation was written by L. Peter Deutsch and
57 * is not derived from the RSA reference implementation in the
58 * RFC. The version included in D-Bus comes from the Ghostscript
63 #ifndef DOXYGEN_SHOULD_SKIP_THIS
65 * For reference, here is the program that computed the T values.
67 #ifdef COMPUTE_T_VALUES
70 main(int argc, char **argv)
73 for (i = 1; i <= 64; ++i)
75 unsigned long v = (unsigned long)(4294967296.0 * fabs(sin((double)i)));
78 * The following nonsense is only to avoid compiler warnings about
79 * "integer constant is unsigned in ANSI C, signed with -traditional".
83 printf("#define T%d /* 0x%08lx */ (T_MASK ^ 0x%08lx)\n", i,
84 v, (unsigned long)(unsigned int)(~v));
86 printf("#define T%d 0x%08lx\n", i, v);
91 #endif /* COMPUTE_T_VALUES */
93 * End of T computation program.
96 #define T_MASK ((dbus_uint32_t)~0)
97 #define T1 /* 0xd76aa478 */ (T_MASK ^ 0x28955b87)
98 #define T2 /* 0xe8c7b756 */ (T_MASK ^ 0x173848a9)
100 #define T4 /* 0xc1bdceee */ (T_MASK ^ 0x3e423111)
101 #define T5 /* 0xf57c0faf */ (T_MASK ^ 0x0a83f050)
102 #define T6 0x4787c62a
103 #define T7 /* 0xa8304613 */ (T_MASK ^ 0x57cfb9ec)
104 #define T8 /* 0xfd469501 */ (T_MASK ^ 0x02b96afe)
105 #define T9 0x698098d8
106 #define T10 /* 0x8b44f7af */ (T_MASK ^ 0x74bb0850)
107 #define T11 /* 0xffff5bb1 */ (T_MASK ^ 0x0000a44e)
108 #define T12 /* 0x895cd7be */ (T_MASK ^ 0x76a32841)
109 #define T13 0x6b901122
110 #define T14 /* 0xfd987193 */ (T_MASK ^ 0x02678e6c)
111 #define T15 /* 0xa679438e */ (T_MASK ^ 0x5986bc71)
112 #define T16 0x49b40821
113 #define T17 /* 0xf61e2562 */ (T_MASK ^ 0x09e1da9d)
114 #define T18 /* 0xc040b340 */ (T_MASK ^ 0x3fbf4cbf)
115 #define T19 0x265e5a51
116 #define T20 /* 0xe9b6c7aa */ (T_MASK ^ 0x16493855)
117 #define T21 /* 0xd62f105d */ (T_MASK ^ 0x29d0efa2)
118 #define T22 0x02441453
119 #define T23 /* 0xd8a1e681 */ (T_MASK ^ 0x275e197e)
120 #define T24 /* 0xe7d3fbc8 */ (T_MASK ^ 0x182c0437)
121 #define T25 0x21e1cde6
122 #define T26 /* 0xc33707d6 */ (T_MASK ^ 0x3cc8f829)
123 #define T27 /* 0xf4d50d87 */ (T_MASK ^ 0x0b2af278)
124 #define T28 0x455a14ed
125 #define T29 /* 0xa9e3e905 */ (T_MASK ^ 0x561c16fa)
126 #define T30 /* 0xfcefa3f8 */ (T_MASK ^ 0x03105c07)
127 #define T31 0x676f02d9
128 #define T32 /* 0x8d2a4c8a */ (T_MASK ^ 0x72d5b375)
129 #define T33 /* 0xfffa3942 */ (T_MASK ^ 0x0005c6bd)
130 #define T34 /* 0x8771f681 */ (T_MASK ^ 0x788e097e)
131 #define T35 0x6d9d6122
132 #define T36 /* 0xfde5380c */ (T_MASK ^ 0x021ac7f3)
133 #define T37 /* 0xa4beea44 */ (T_MASK ^ 0x5b4115bb)
134 #define T38 0x4bdecfa9
135 #define T39 /* 0xf6bb4b60 */ (T_MASK ^ 0x0944b49f)
136 #define T40 /* 0xbebfbc70 */ (T_MASK ^ 0x4140438f)
137 #define T41 0x289b7ec6
138 #define T42 /* 0xeaa127fa */ (T_MASK ^ 0x155ed805)
139 #define T43 /* 0xd4ef3085 */ (T_MASK ^ 0x2b10cf7a)
140 #define T44 0x04881d05
141 #define T45 /* 0xd9d4d039 */ (T_MASK ^ 0x262b2fc6)
142 #define T46 /* 0xe6db99e5 */ (T_MASK ^ 0x1924661a)
143 #define T47 0x1fa27cf8
144 #define T48 /* 0xc4ac5665 */ (T_MASK ^ 0x3b53a99a)
145 #define T49 /* 0xf4292244 */ (T_MASK ^ 0x0bd6ddbb)
146 #define T50 0x432aff97
147 #define T51 /* 0xab9423a7 */ (T_MASK ^ 0x546bdc58)
148 #define T52 /* 0xfc93a039 */ (T_MASK ^ 0x036c5fc6)
149 #define T53 0x655b59c3
150 #define T54 /* 0x8f0ccc92 */ (T_MASK ^ 0x70f3336d)
151 #define T55 /* 0xffeff47d */ (T_MASK ^ 0x00100b82)
152 #define T56 /* 0x85845dd1 */ (T_MASK ^ 0x7a7ba22e)
153 #define T57 0x6fa87e4f
154 #define T58 /* 0xfe2ce6e0 */ (T_MASK ^ 0x01d3191f)
155 #define T59 /* 0xa3014314 */ (T_MASK ^ 0x5cfebceb)
156 #define T60 0x4e0811a1
157 #define T61 /* 0xf7537e82 */ (T_MASK ^ 0x08ac817d)
158 #define T62 /* 0xbd3af235 */ (T_MASK ^ 0x42c50dca)
159 #define T63 0x2ad7d2bb
160 #define T64 /* 0xeb86d391 */ (T_MASK ^ 0x14792c6e)
161 #endif /* !DOXYGEN_SHOULD_SKIP_THIS */
164 md5_process(DBusMD5Context *context, const unsigned char *data /*[64]*/)
167 a = context->abcd[0], b = context->abcd[1],
168 c = context->abcd[2], d = context->abcd[3];
171 #ifdef WORDS_BIGENDIAN
173 * On big-endian machines, we must arrange the bytes in the right
174 * order. (This also works on machines of unknown byte order.)
177 const unsigned char *xp = data;
180 for (i = 0; i < 16; ++i, xp += 4)
181 X[i] = xp[0] + (xp[1] << 8) + (xp[2] << 16) + (xp[3] << 24);
183 #else /* !WORDS_BIGENDIAN */
185 * On little-endian machines, we can process properly aligned data
186 * without copying it.
188 dbus_uint32_t xbuf[16];
189 const dbus_uint32_t *X;
191 if (!((data - (const unsigned char *)0) & 3))
193 /* data are properly aligned */
194 X = (const dbus_uint32_t *)data;
199 memcpy(xbuf, data, 64);
204 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32 - (n))))
207 /* Let [abcd k s i] denote the operation
208 a = b + ((a + F(b,c,d) + X[k] + T[i]) <<< s). */
209 #define F(x, y, z) (((x) & (y)) | (~(x) & (z)))
210 #define SET(a, b, c, d, k, s, Ti) \
211 t = a + F(b,c,d) + X[k] + Ti; \
212 a = ROTATE_LEFT(t, s) + b
213 /* Do the following 16 operations. */
214 SET(a, b, c, d, 0, 7, T1);
215 SET(d, a, b, c, 1, 12, T2);
216 SET(c, d, a, b, 2, 17, T3);
217 SET(b, c, d, a, 3, 22, T4);
218 SET(a, b, c, d, 4, 7, T5);
219 SET(d, a, b, c, 5, 12, T6);
220 SET(c, d, a, b, 6, 17, T7);
221 SET(b, c, d, a, 7, 22, T8);
222 SET(a, b, c, d, 8, 7, T9);
223 SET(d, a, b, c, 9, 12, T10);
224 SET(c, d, a, b, 10, 17, T11);
225 SET(b, c, d, a, 11, 22, T12);
226 SET(a, b, c, d, 12, 7, T13);
227 SET(d, a, b, c, 13, 12, T14);
228 SET(c, d, a, b, 14, 17, T15);
229 SET(b, c, d, a, 15, 22, T16);
233 /* Let [abcd k s i] denote the operation
234 a = b + ((a + G(b,c,d) + X[k] + T[i]) <<< s). */
235 #define G(x, y, z) (((x) & (z)) | ((y) & ~(z)))
236 #define SET(a, b, c, d, k, s, Ti) \
237 t = a + G(b,c,d) + X[k] + Ti; \
238 a = ROTATE_LEFT(t, s) + b
239 /* Do the following 16 operations. */
240 SET(a, b, c, d, 1, 5, T17);
241 SET(d, a, b, c, 6, 9, T18);
242 SET(c, d, a, b, 11, 14, T19);
243 SET(b, c, d, a, 0, 20, T20);
244 SET(a, b, c, d, 5, 5, T21);
245 SET(d, a, b, c, 10, 9, T22);
246 SET(c, d, a, b, 15, 14, T23);
247 SET(b, c, d, a, 4, 20, T24);
248 SET(a, b, c, d, 9, 5, T25);
249 SET(d, a, b, c, 14, 9, T26);
250 SET(c, d, a, b, 3, 14, T27);
251 SET(b, c, d, a, 8, 20, T28);
252 SET(a, b, c, d, 13, 5, T29);
253 SET(d, a, b, c, 2, 9, T30);
254 SET(c, d, a, b, 7, 14, T31);
255 SET(b, c, d, a, 12, 20, T32);
259 /* Let [abcd k s t] denote the operation
260 a = b + ((a + H(b,c,d) + X[k] + T[i]) <<< s). */
261 #define H(x, y, z) ((x) ^ (y) ^ (z))
262 #define SET(a, b, c, d, k, s, Ti) \
263 t = a + H(b,c,d) + X[k] + Ti; \
264 a = ROTATE_LEFT(t, s) + b
265 /* Do the following 16 operations. */
266 SET(a, b, c, d, 5, 4, T33);
267 SET(d, a, b, c, 8, 11, T34);
268 SET(c, d, a, b, 11, 16, T35);
269 SET(b, c, d, a, 14, 23, T36);
270 SET(a, b, c, d, 1, 4, T37);
271 SET(d, a, b, c, 4, 11, T38);
272 SET(c, d, a, b, 7, 16, T39);
273 SET(b, c, d, a, 10, 23, T40);
274 SET(a, b, c, d, 13, 4, T41);
275 SET(d, a, b, c, 0, 11, T42);
276 SET(c, d, a, b, 3, 16, T43);
277 SET(b, c, d, a, 6, 23, T44);
278 SET(a, b, c, d, 9, 4, T45);
279 SET(d, a, b, c, 12, 11, T46);
280 SET(c, d, a, b, 15, 16, T47);
281 SET(b, c, d, a, 2, 23, T48);
285 /* Let [abcd k s t] denote the operation
286 a = b + ((a + I(b,c,d) + X[k] + T[i]) <<< s). */
287 #define I(x, y, z) ((y) ^ ((x) | ~(z)))
288 #define SET(a, b, c, d, k, s, Ti) \
289 t = a + I(b,c,d) + X[k] + Ti; \
290 a = ROTATE_LEFT(t, s) + b
291 /* Do the following 16 operations. */
292 SET(a, b, c, d, 0, 6, T49);
293 SET(d, a, b, c, 7, 10, T50);
294 SET(c, d, a, b, 14, 15, T51);
295 SET(b, c, d, a, 5, 21, T52);
296 SET(a, b, c, d, 12, 6, T53);
297 SET(d, a, b, c, 3, 10, T54);
298 SET(c, d, a, b, 10, 15, T55);
299 SET(b, c, d, a, 1, 21, T56);
300 SET(a, b, c, d, 8, 6, T57);
301 SET(d, a, b, c, 15, 10, T58);
302 SET(c, d, a, b, 6, 15, T59);
303 SET(b, c, d, a, 13, 21, T60);
304 SET(a, b, c, d, 4, 6, T61);
305 SET(d, a, b, c, 11, 10, T62);
306 SET(c, d, a, b, 2, 15, T63);
307 SET(b, c, d, a, 9, 21, T64);
310 /* Then perform the following additions. (That is increment each
311 of the four registers by the value it had before this block
313 context->abcd[0] += a;
314 context->abcd[1] += b;
315 context->abcd[2] += c;
316 context->abcd[3] += d;
320 md5_init (DBusMD5Context *context)
322 context->count[0] = context->count[1] = 0;
323 context->abcd[0] = 0x67452301;
324 context->abcd[1] = /*0xefcdab89*/ T_MASK ^ 0x10325476;
325 context->abcd[2] = /*0x98badcfe*/ T_MASK ^ 0x67452301;
326 context->abcd[3] = 0x10325476;
330 md5_append (DBusMD5Context *context, const unsigned char *data, int nbytes)
332 const unsigned char *p = data;
334 int offset = (context->count[0] >> 3) & 63;
335 dbus_uint32_t nbits = (dbus_uint32_t)(nbytes << 3);
340 /* Update the message length. */
341 context->count[1] += nbytes >> 29;
342 context->count[0] += nbits;
343 if (context->count[0] < nbits)
346 /* Process an initial partial block. */
349 int copy = (offset + nbytes > 64 ? 64 - offset : nbytes);
351 memcpy(context->buf + offset, p, copy);
352 if (offset + copy < 64)
356 md5_process(context, context->buf);
359 /* Process full blocks. */
360 for (; left >= 64; p += 64, left -= 64)
361 md5_process(context, p);
363 /* Process a final partial block. */
365 memcpy(context->buf, p, left);
369 md5_finish (DBusMD5Context *context, unsigned char digest[16])
371 static const unsigned char pad[64] = {
372 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
373 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
374 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
375 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
377 unsigned char data[8];
380 /* Save the length before padding. */
381 for (i = 0; i < 8; ++i)
382 data[i] = (unsigned char)(context->count[i >> 2] >> ((i & 3) << 3));
383 /* Pad to 56 bytes mod 64. */
384 md5_append(context, pad, ((55 - (context->count[0] >> 3)) & 63) + 1);
385 /* Append the length. */
386 md5_append(context, data, 8);
387 for (i = 0; i < 16; ++i)
388 digest[i] = (unsigned char)(context->abcd[i >> 2] >> ((i & 3) << 3));
391 /** @} */ /* End of internals */
394 * @addtogroup DBusMD5
400 * Initializes the MD5 context.
402 * @param context an uninitialized context, typically on the stack.
405 _dbus_md5_init (DBusMD5Context *context)
412 * Feeds more data into an existing md5sum computation.
414 * @param context the MD5 context
415 * @param data the additional data to hash
418 _dbus_md5_update (DBusMD5Context *context,
419 const DBusString *data)
421 unsigned int inputLen;
422 unsigned char *input;
424 _dbus_string_get_const_data (data, (const char**) &input);
425 inputLen = _dbus_string_get_length (data);
427 md5_append (context, input, inputLen);
431 * MD5 finalization. Ends an MD5 message-digest operation, writing the
432 * the message digest and zeroing the context. The results are
433 * returned as a raw 16-byte digest, not as the ascii-hex-digits
434 * string form of the digest.
436 * @param context the MD5 context
437 * @param results string to append the 16-byte MD5 digest to
438 * @returns #FALSE if not enough memory to append the digest
442 _dbus_md5_final (DBusMD5Context *context,
445 unsigned char digest[16];
447 md5_finish (context, digest);
449 if (!_dbus_string_append_len (results, digest, 16))
452 /* some kind of security paranoia, though it seems pointless
453 * to me given the nonzeroed stuff flying around
455 _DBUS_ZERO(*context);
461 * Computes the ASCII hex-encoded md5sum of the given data and
462 * appends it to the output string.
464 * @param data input data to be hashed
465 * @param ascii_output string to append ASCII md5sum to
466 * @returns #FALSE if not enough memory
469 _dbus_md5_compute (const DBusString *data,
470 DBusString *ascii_output)
472 DBusMD5Context context;
475 _dbus_md5_init (&context);
477 _dbus_md5_update (&context, data);
479 if (!_dbus_string_init (&digest))
482 if (!_dbus_md5_final (&context, &digest))
485 if (!_dbus_string_hex_encode (&digest, 0, ascii_output,
486 _dbus_string_get_length (ascii_output)))
489 _dbus_string_free (&digest);
494 _dbus_string_free (&digest);
498 /** @} */ /* end of exported functions */
500 #ifdef DBUS_BUILD_TESTS
501 #include "dbus-test.h"
505 check_md5_binary (const unsigned char *input,
507 const char *expected)
509 DBusString input_str;
510 DBusString expected_str;
513 _dbus_string_init_const_len (&input_str, input, input_len);
514 _dbus_string_init_const (&expected_str, expected);
516 if (!_dbus_string_init (&results))
517 _dbus_assert_not_reached ("no memory for md5 results");
519 if (!_dbus_md5_compute (&input_str, &results))
520 _dbus_assert_not_reached ("no memory for md5 results");
522 if (!_dbus_string_equal (&expected_str, &results))
525 _dbus_string_get_const_data (&results, &s);
526 _dbus_warn ("Expected hash %s got %s for md5 sum\n",
528 _dbus_string_free (&results);
532 _dbus_string_free (&results);
537 check_md5_str (const char *input,
538 const char *expected)
540 return check_md5_binary (input, strlen (input), expected);
544 * @ingroup DBusMD5Internals
545 * Unit test for MD5 computation.
547 * @returns #TRUE on success.
550 _dbus_md5_test (void)
552 unsigned char all_bytes[256];
562 if (!check_md5_binary (all_bytes, 256,
563 "e2c865db4162bed963bfaa9ef6ac18f0"))
566 #define CHECK(input,expected) if (!check_md5_str (input, expected)) return FALSE
568 CHECK ("", "d41d8cd98f00b204e9800998ecf8427e");
569 CHECK ("a", "0cc175b9c0f1b6a831c399e269772661");
570 CHECK ("abc", "900150983cd24fb0d6963f7d28e17f72");
571 CHECK ("message digest", "f96b697d7cb7938d525a2f31aaf161d0");
572 CHECK ("abcdefghijklmnopqrstuvwxyz", "c3fcd3d76192e4007dfb496cca67e13b");
573 CHECK ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
574 "d174ab98d277d9f5a5611c2c9f419d9f");
575 CHECK ("12345678901234567890123456789012345678901234567890123456789012345678901234567890",
576 "57edf4a22be3c955ac49da2e2107b67a");
581 #endif /* DBUS_BUILD_TESTS */