|
1 /* $Id$ */ |
|
2 |
|
3 /* |
|
4 Copyright (C) 1999, 2000, 2002 Aladdin Enterprises. All rights reserved. |
|
5 |
|
6 This software is provided 'as-is', without any express or implied |
|
7 warranty. In no event will the authors be held liable for any damages |
|
8 arising from the use of this software. |
|
9 |
|
10 Permission is granted to anyone to use this software for any purpose, |
|
11 including commercial applications, and to alter it and redistribute it |
|
12 freely, subject to the following restrictions: |
|
13 |
|
14 1. The origin of this software must not be misrepresented; you must not |
|
15 claim that you wrote the original software. If you use this software |
|
16 in a product, an acknowledgment in the product documentation would be |
|
17 appreciated but is not required. |
|
18 2. Altered source versions must be plainly marked as such, and must not be |
|
19 misrepresented as being the original software. |
|
20 3. This notice may not be removed or altered from any source distribution. |
|
21 |
|
22 L. Peter Deutsch |
|
23 ghost@aladdin.com |
|
24 |
|
25 */ |
|
26 /* $Id$ */ |
|
27 /* |
|
28 Independent implementation of MD5 (RFC 1321). |
|
29 |
|
30 This code implements the MD5 Algorithm defined in RFC 1321, whose |
|
31 text is available at |
|
32 http://www.ietf.org/rfc/rfc1321.txt |
|
33 The code is derived from the text of the RFC, including the test suite |
|
34 (section A.5) but excluding the rest of Appendix A. It does not include |
|
35 any code or documentation that is identified in the RFC as being |
|
36 copyrighted. |
|
37 |
|
38 The original and principal author of md5.c is L. Peter Deutsch |
|
39 <ghost@aladdin.com>. Other authors are noted in the change history |
|
40 that follows (in reverse chronological order): |
|
41 |
|
42 2002-04-13 lpd Clarified derivation from RFC 1321; now handles byte order |
|
43 either statically or dynamically; added missing #include <string.h> |
|
44 in library. |
|
45 2002-03-11 lpd Corrected argument list for main(), and added int return |
|
46 type, in test program and T value program. |
|
47 2002-02-21 lpd Added missing #include <stdio.h> in test program. |
|
48 2000-07-03 lpd Patched to eliminate warnings about "constant is |
|
49 unsigned in ANSI C, signed in traditional"; made test program |
|
50 self-checking. |
|
51 1999-11-04 lpd Edited comments slightly for automatic TOC extraction. |
|
52 1999-10-18 lpd Fixed typo in header comment (ansi2knr rather than md5). |
|
53 1999-05-03 lpd Original version. |
|
54 */ |
|
55 |
|
56 #include "stdafx.h" |
|
57 #include "md5.h" |
|
58 #include <string.h> |
|
59 |
|
60 #undef BYTE_ORDER /* 1 = big-endian, -1 = little-endian, 0 = unknown */ |
|
61 #if defined(TTD_BIG_ENDIAN) |
|
62 # define BYTE_ORDER 1 |
|
63 #else |
|
64 # define BYTE_ORDER -1 |
|
65 #endif |
|
66 |
|
67 #define T_MASK ((md5_word_t)~0) |
|
68 #define T1 /* 0xd76aa478 */ (T_MASK ^ 0x28955b87) |
|
69 #define T2 /* 0xe8c7b756 */ (T_MASK ^ 0x173848a9) |
|
70 #define T3 0x242070db |
|
71 #define T4 /* 0xc1bdceee */ (T_MASK ^ 0x3e423111) |
|
72 #define T5 /* 0xf57c0faf */ (T_MASK ^ 0x0a83f050) |
|
73 #define T6 0x4787c62a |
|
74 #define T7 /* 0xa8304613 */ (T_MASK ^ 0x57cfb9ec) |
|
75 #define T8 /* 0xfd469501 */ (T_MASK ^ 0x02b96afe) |
|
76 #define T9 0x698098d8 |
|
77 #define T10 /* 0x8b44f7af */ (T_MASK ^ 0x74bb0850) |
|
78 #define T11 /* 0xffff5bb1 */ (T_MASK ^ 0x0000a44e) |
|
79 #define T12 /* 0x895cd7be */ (T_MASK ^ 0x76a32841) |
|
80 #define T13 0x6b901122 |
|
81 #define T14 /* 0xfd987193 */ (T_MASK ^ 0x02678e6c) |
|
82 #define T15 /* 0xa679438e */ (T_MASK ^ 0x5986bc71) |
|
83 #define T16 0x49b40821 |
|
84 #define T17 /* 0xf61e2562 */ (T_MASK ^ 0x09e1da9d) |
|
85 #define T18 /* 0xc040b340 */ (T_MASK ^ 0x3fbf4cbf) |
|
86 #define T19 0x265e5a51 |
|
87 #define T20 /* 0xe9b6c7aa */ (T_MASK ^ 0x16493855) |
|
88 #define T21 /* 0xd62f105d */ (T_MASK ^ 0x29d0efa2) |
|
89 #define T22 0x02441453 |
|
90 #define T23 /* 0xd8a1e681 */ (T_MASK ^ 0x275e197e) |
|
91 #define T24 /* 0xe7d3fbc8 */ (T_MASK ^ 0x182c0437) |
|
92 #define T25 0x21e1cde6 |
|
93 #define T26 /* 0xc33707d6 */ (T_MASK ^ 0x3cc8f829) |
|
94 #define T27 /* 0xf4d50d87 */ (T_MASK ^ 0x0b2af278) |
|
95 #define T28 0x455a14ed |
|
96 #define T29 /* 0xa9e3e905 */ (T_MASK ^ 0x561c16fa) |
|
97 #define T30 /* 0xfcefa3f8 */ (T_MASK ^ 0x03105c07) |
|
98 #define T31 0x676f02d9 |
|
99 #define T32 /* 0x8d2a4c8a */ (T_MASK ^ 0x72d5b375) |
|
100 #define T33 /* 0xfffa3942 */ (T_MASK ^ 0x0005c6bd) |
|
101 #define T34 /* 0x8771f681 */ (T_MASK ^ 0x788e097e) |
|
102 #define T35 0x6d9d6122 |
|
103 #define T36 /* 0xfde5380c */ (T_MASK ^ 0x021ac7f3) |
|
104 #define T37 /* 0xa4beea44 */ (T_MASK ^ 0x5b4115bb) |
|
105 #define T38 0x4bdecfa9 |
|
106 #define T39 /* 0xf6bb4b60 */ (T_MASK ^ 0x0944b49f) |
|
107 #define T40 /* 0xbebfbc70 */ (T_MASK ^ 0x4140438f) |
|
108 #define T41 0x289b7ec6 |
|
109 #define T42 /* 0xeaa127fa */ (T_MASK ^ 0x155ed805) |
|
110 #define T43 /* 0xd4ef3085 */ (T_MASK ^ 0x2b10cf7a) |
|
111 #define T44 0x04881d05 |
|
112 #define T45 /* 0xd9d4d039 */ (T_MASK ^ 0x262b2fc6) |
|
113 #define T46 /* 0xe6db99e5 */ (T_MASK ^ 0x1924661a) |
|
114 #define T47 0x1fa27cf8 |
|
115 #define T48 /* 0xc4ac5665 */ (T_MASK ^ 0x3b53a99a) |
|
116 #define T49 /* 0xf4292244 */ (T_MASK ^ 0x0bd6ddbb) |
|
117 #define T50 0x432aff97 |
|
118 #define T51 /* 0xab9423a7 */ (T_MASK ^ 0x546bdc58) |
|
119 #define T52 /* 0xfc93a039 */ (T_MASK ^ 0x036c5fc6) |
|
120 #define T53 0x655b59c3 |
|
121 #define T54 /* 0x8f0ccc92 */ (T_MASK ^ 0x70f3336d) |
|
122 #define T55 /* 0xffeff47d */ (T_MASK ^ 0x00100b82) |
|
123 #define T56 /* 0x85845dd1 */ (T_MASK ^ 0x7a7ba22e) |
|
124 #define T57 0x6fa87e4f |
|
125 #define T58 /* 0xfe2ce6e0 */ (T_MASK ^ 0x01d3191f) |
|
126 #define T59 /* 0xa3014314 */ (T_MASK ^ 0x5cfebceb) |
|
127 #define T60 0x4e0811a1 |
|
128 #define T61 /* 0xf7537e82 */ (T_MASK ^ 0x08ac817d) |
|
129 #define T62 /* 0xbd3af235 */ (T_MASK ^ 0x42c50dca) |
|
130 #define T63 0x2ad7d2bb |
|
131 #define T64 /* 0xeb86d391 */ (T_MASK ^ 0x14792c6e) |
|
132 |
|
133 |
|
134 static void |
|
135 md5_process(md5_state_t *pms, const md5_byte_t *data /*[64]*/) |
|
136 { |
|
137 md5_word_t |
|
138 a = pms->abcd[0], b = pms->abcd[1], |
|
139 c = pms->abcd[2], d = pms->abcd[3]; |
|
140 md5_word_t t; |
|
141 #if BYTE_ORDER > 0 |
|
142 /* Define storage only for big-endian CPUs. */ |
|
143 md5_word_t X[16]; |
|
144 #else |
|
145 /* Define storage for little-endian or both types of CPUs. */ |
|
146 md5_word_t xbuf[16]; |
|
147 const md5_word_t *X; |
|
148 #endif |
|
149 |
|
150 { |
|
151 #if BYTE_ORDER == 0 |
|
152 /* |
|
153 * Determine dynamically whether this is a big-endian or |
|
154 * little-endian machine, since we can use a more efficient |
|
155 * algorithm on the latter. |
|
156 */ |
|
157 static const int w = 1; |
|
158 |
|
159 if (*((const md5_byte_t *)&w)) /* dynamic little-endian */ |
|
160 #endif |
|
161 #if BYTE_ORDER <= 0 /* little-endian */ |
|
162 { |
|
163 /* |
|
164 * On little-endian machines, we can process properly aligned |
|
165 * data without copying it. |
|
166 */ |
|
167 if (!((data - (const md5_byte_t *)0) & 3)) { |
|
168 /* data are properly aligned */ |
|
169 X = (const md5_word_t *)data; |
|
170 } else { |
|
171 /* not aligned */ |
|
172 memcpy(xbuf, data, 64); |
|
173 X = xbuf; |
|
174 } |
|
175 } |
|
176 #endif |
|
177 #if BYTE_ORDER == 0 |
|
178 else /* dynamic big-endian */ |
|
179 #endif |
|
180 #if BYTE_ORDER >= 0 /* big-endian */ |
|
181 { |
|
182 /* |
|
183 * On big-endian machines, we must arrange the bytes in the |
|
184 * right order. |
|
185 */ |
|
186 const md5_byte_t *xp = data; |
|
187 int i; |
|
188 |
|
189 # if BYTE_ORDER == 0 |
|
190 X = xbuf; /* (dynamic only) */ |
|
191 # else |
|
192 # define xbuf X /* (static only) */ |
|
193 # endif |
|
194 for (i = 0; i < 16; ++i, xp += 4) |
|
195 xbuf[i] = xp[0] + (xp[1] << 8) + (xp[2] << 16) + (xp[3] << 24); |
|
196 } |
|
197 #endif |
|
198 } |
|
199 |
|
200 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32 - (n)))) |
|
201 |
|
202 /* Round 1. */ |
|
203 /* Let [abcd k s i] denote the operation |
|
204 a = b + ((a + F(b,c,d) + X[k] + T[i]) <<< s). */ |
|
205 #define F(x, y, z) (((x) & (y)) | (~(x) & (z))) |
|
206 #define SET(a, b, c, d, k, s, Ti)\ |
|
207 t = a + F(b,c,d) + X[k] + Ti;\ |
|
208 a = ROTATE_LEFT(t, s) + b |
|
209 /* Do the following 16 operations. */ |
|
210 SET(a, b, c, d, 0, 7, T1); |
|
211 SET(d, a, b, c, 1, 12, T2); |
|
212 SET(c, d, a, b, 2, 17, T3); |
|
213 SET(b, c, d, a, 3, 22, T4); |
|
214 SET(a, b, c, d, 4, 7, T5); |
|
215 SET(d, a, b, c, 5, 12, T6); |
|
216 SET(c, d, a, b, 6, 17, T7); |
|
217 SET(b, c, d, a, 7, 22, T8); |
|
218 SET(a, b, c, d, 8, 7, T9); |
|
219 SET(d, a, b, c, 9, 12, T10); |
|
220 SET(c, d, a, b, 10, 17, T11); |
|
221 SET(b, c, d, a, 11, 22, T12); |
|
222 SET(a, b, c, d, 12, 7, T13); |
|
223 SET(d, a, b, c, 13, 12, T14); |
|
224 SET(c, d, a, b, 14, 17, T15); |
|
225 SET(b, c, d, a, 15, 22, T16); |
|
226 #undef SET |
|
227 |
|
228 /* Round 2. */ |
|
229 /* Let [abcd k s i] denote the operation |
|
230 a = b + ((a + G(b,c,d) + X[k] + T[i]) <<< s). */ |
|
231 #define G(x, y, z) (((x) & (z)) | ((y) & ~(z))) |
|
232 #define SET(a, b, c, d, k, s, Ti)\ |
|
233 t = a + G(b,c,d) + X[k] + Ti;\ |
|
234 a = ROTATE_LEFT(t, s) + b |
|
235 /* Do the following 16 operations. */ |
|
236 SET(a, b, c, d, 1, 5, T17); |
|
237 SET(d, a, b, c, 6, 9, T18); |
|
238 SET(c, d, a, b, 11, 14, T19); |
|
239 SET(b, c, d, a, 0, 20, T20); |
|
240 SET(a, b, c, d, 5, 5, T21); |
|
241 SET(d, a, b, c, 10, 9, T22); |
|
242 SET(c, d, a, b, 15, 14, T23); |
|
243 SET(b, c, d, a, 4, 20, T24); |
|
244 SET(a, b, c, d, 9, 5, T25); |
|
245 SET(d, a, b, c, 14, 9, T26); |
|
246 SET(c, d, a, b, 3, 14, T27); |
|
247 SET(b, c, d, a, 8, 20, T28); |
|
248 SET(a, b, c, d, 13, 5, T29); |
|
249 SET(d, a, b, c, 2, 9, T30); |
|
250 SET(c, d, a, b, 7, 14, T31); |
|
251 SET(b, c, d, a, 12, 20, T32); |
|
252 #undef SET |
|
253 |
|
254 /* Round 3. */ |
|
255 /* Let [abcd k s t] denote the operation |
|
256 a = b + ((a + H(b,c,d) + X[k] + T[i]) <<< s). */ |
|
257 #define H(x, y, z) ((x) ^ (y) ^ (z)) |
|
258 #define SET(a, b, c, d, k, s, Ti)\ |
|
259 t = a + H(b,c,d) + X[k] + Ti;\ |
|
260 a = ROTATE_LEFT(t, s) + b |
|
261 /* Do the following 16 operations. */ |
|
262 SET(a, b, c, d, 5, 4, T33); |
|
263 SET(d, a, b, c, 8, 11, T34); |
|
264 SET(c, d, a, b, 11, 16, T35); |
|
265 SET(b, c, d, a, 14, 23, T36); |
|
266 SET(a, b, c, d, 1, 4, T37); |
|
267 SET(d, a, b, c, 4, 11, T38); |
|
268 SET(c, d, a, b, 7, 16, T39); |
|
269 SET(b, c, d, a, 10, 23, T40); |
|
270 SET(a, b, c, d, 13, 4, T41); |
|
271 SET(d, a, b, c, 0, 11, T42); |
|
272 SET(c, d, a, b, 3, 16, T43); |
|
273 SET(b, c, d, a, 6, 23, T44); |
|
274 SET(a, b, c, d, 9, 4, T45); |
|
275 SET(d, a, b, c, 12, 11, T46); |
|
276 SET(c, d, a, b, 15, 16, T47); |
|
277 SET(b, c, d, a, 2, 23, T48); |
|
278 #undef SET |
|
279 |
|
280 /* Round 4. */ |
|
281 /* Let [abcd k s t] denote the operation |
|
282 a = b + ((a + I(b,c,d) + X[k] + T[i]) <<< s). */ |
|
283 #define I(x, y, z) ((y) ^ ((x) | ~(z))) |
|
284 #define SET(a, b, c, d, k, s, Ti)\ |
|
285 t = a + I(b,c,d) + X[k] + Ti;\ |
|
286 a = ROTATE_LEFT(t, s) + b |
|
287 /* Do the following 16 operations. */ |
|
288 SET(a, b, c, d, 0, 6, T49); |
|
289 SET(d, a, b, c, 7, 10, T50); |
|
290 SET(c, d, a, b, 14, 15, T51); |
|
291 SET(b, c, d, a, 5, 21, T52); |
|
292 SET(a, b, c, d, 12, 6, T53); |
|
293 SET(d, a, b, c, 3, 10, T54); |
|
294 SET(c, d, a, b, 10, 15, T55); |
|
295 SET(b, c, d, a, 1, 21, T56); |
|
296 SET(a, b, c, d, 8, 6, T57); |
|
297 SET(d, a, b, c, 15, 10, T58); |
|
298 SET(c, d, a, b, 6, 15, T59); |
|
299 SET(b, c, d, a, 13, 21, T60); |
|
300 SET(a, b, c, d, 4, 6, T61); |
|
301 SET(d, a, b, c, 11, 10, T62); |
|
302 SET(c, d, a, b, 2, 15, T63); |
|
303 SET(b, c, d, a, 9, 21, T64); |
|
304 #undef SET |
|
305 |
|
306 /* Then perform the following additions. (That is increment each |
|
307 of the four registers by the value it had before this block |
|
308 was started.) */ |
|
309 pms->abcd[0] += a; |
|
310 pms->abcd[1] += b; |
|
311 pms->abcd[2] += c; |
|
312 pms->abcd[3] += d; |
|
313 } |
|
314 |
|
315 void |
|
316 md5_init(md5_state_t *pms) |
|
317 { |
|
318 pms->count[0] = pms->count[1] = 0; |
|
319 pms->abcd[0] = 0x67452301; |
|
320 pms->abcd[1] = /*0xefcdab89*/ T_MASK ^ 0x10325476; |
|
321 pms->abcd[2] = /*0x98badcfe*/ T_MASK ^ 0x67452301; |
|
322 pms->abcd[3] = 0x10325476; |
|
323 } |
|
324 |
|
325 void |
|
326 md5_append(md5_state_t *pms, const void *data, size_t nbytes) |
|
327 { |
|
328 const md5_byte_t *p = (const md5_byte_t *)data; |
|
329 size_t left = nbytes; |
|
330 size_t offset = (pms->count[0] >> 3) & 63; |
|
331 md5_word_t nbits = (md5_word_t)(nbytes << 3); |
|
332 |
|
333 if (nbytes <= 0) |
|
334 return; |
|
335 |
|
336 /* Update the message length. */ |
|
337 pms->count[1] += (md5_word_t)(nbytes >> 29); |
|
338 pms->count[0] += nbits; |
|
339 if (pms->count[0] < nbits) |
|
340 pms->count[1]++; |
|
341 |
|
342 /* Process an initial partial block. */ |
|
343 if (offset) { |
|
344 size_t copy = (offset + nbytes > 64 ? 64 - offset : nbytes); |
|
345 |
|
346 memcpy(pms->buf + offset, p, copy); |
|
347 if (offset + copy < 64) |
|
348 return; |
|
349 p += copy; |
|
350 left -= copy; |
|
351 md5_process(pms, pms->buf); |
|
352 } |
|
353 |
|
354 /* Process full blocks. */ |
|
355 for (; left >= 64; p += 64, left -= 64) |
|
356 md5_process(pms, p); |
|
357 |
|
358 /* Process a final partial block. */ |
|
359 if (left) |
|
360 memcpy(pms->buf, p, left); |
|
361 } |
|
362 |
|
363 void |
|
364 md5_finish(md5_state_t *pms, md5_byte_t digest[16]) |
|
365 { |
|
366 static const md5_byte_t pad[64] = { |
|
367 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
|
368 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
|
369 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
|
370 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 |
|
371 }; |
|
372 md5_byte_t data[8]; |
|
373 int i; |
|
374 |
|
375 /* Save the length before padding. */ |
|
376 for (i = 0; i < 8; ++i) |
|
377 data[i] = (md5_byte_t)(pms->count[i >> 2] >> ((i & 3) << 3)); |
|
378 /* Pad to 56 bytes mod 64. */ |
|
379 md5_append(pms, pad, ((55 - (pms->count[0] >> 3)) & 63) + 1); |
|
380 /* Append the length. */ |
|
381 md5_append(pms, data, 8); |
|
382 for (i = 0; i < 16; ++i) |
|
383 digest[i] = (md5_byte_t)(pms->abcd[i >> 2] >> ((i & 3) << 3)); |
|
384 } |