Ruby: ext/digest/md5/md5.c Source File

Ruby 3.0.5p211 (2022-11-24 revision ba5cf0f7c52d4d35cc6a173c89eda98ceffa2dcf)

md5.c
Go to the documentation of this file.
1/*
2 Copyright (C) 1999, 2000 Aladdin Enterprises. All rights reserved.
3
4 This software is provided 'as-is', without any express or implied
5 warranty. In no event will the authors be held liable for any damages
6 arising from the use of this software.
7
8 Permission is granted to anyone to use this software for any purpose,
9 including commercial applications, and to alter it and redistribute it
10 freely, subject to the following restrictions:
11
12 1. The origin of this software must not be misrepresented; you must not
13 claim that you wrote the original software. If you use this software
14 in a product, an acknowledgment in the product documentation would be
15 appreciated but is not required.
16 2. Altered source versions must be plainly marked as such, and must not be
17 misrepresented as being the original software.
18 3. This notice may not be removed or altered from any source distribution.
19
20 L. Peter Deutsch
21 ghost@aladdin.com
22
23 */
24
25/*
26 Independent implementation of MD5 (RFC 1321).
27
28 This code implements the MD5 Algorithm defined in RFC 1321.
29 It is derived directly from the text of the RFC and not from the
30 reference implementation.
31
32 The original and principal author of md5.c is L. Peter Deutsch
33 <ghost@aladdin.com>. Other authors are noted in the change history
34 that follows (in reverse chronological order):
35
36 2000-07-03 lpd Patched to eliminate warnings about "constant is
37 unsigned in ANSI C, signed in traditional";
38 made test program self-checking.
39 1999-11-04 lpd Edited comments slightly for automatic TOC extraction.
40 1999-10-18 lpd Fixed typo in header comment (ansi2knr rather than md5).
41 1999-05-03 lpd Original version.
42 */
43
44/*
45 This code was modified for use in Ruby.
46
47 - Akinori MUSHA <knu@idaemons.org>
48 */
49
50/*$OrigId: md5c.c,v 1.2 2001/03/26 08:57:14 matz Exp $ */
51/*$RoughId: md5.c,v 1.2 2001/07/13 19:48:41 knu Exp $ */
52/*$Id$ */
53
54#include "md5.h"
55
56#ifdef TEST
57/*
58 * Compile with -DTEST to create a self-contained executable test program.
59 * The test program should print out the same values as given in section
60 * A.5 of RFC 1321, reproduced below.
61 */
62#include <string.h>
63int
64 main(void)
65{
66 static const char *const test[7*2] = {
67 "", "d41d8cd98f00b204e9800998ecf8427e",
68 "a", "0cc175b9c0f1b6a831c399e269772661",
69 "abc", "900150983cd24fb0d6963f7d28e17f72",
70 "message digest", "f96b697d7cb7938d525a2f31aaf161d0",
71 "abcdefghijklmnopqrstuvwxyz", "c3fcd3d76192e4007dfb496cca67e13b",
72 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
73 "d174ab98d277d9f5a5611c2c9f419d9f",
74 "12345678901234567890123456789012345678901234567890123456789012345678901234567890", "57edf4a22be3c955ac49da2e2107b67a"
75 };
76 int i;
77
78 for (i = 0; i < 7*2; i += 2) {
79 MD5_CTX state;
80 uint8_t digest[16];
81 char hex_output[16*2 + 1];
82 int di;
83
84 MD5_Init(&state);
85 MD5_Update(&state, (const uint8_t *)test[i], strlen(test[i]));
86 MD5_Final(digest, &state);
87 printf("MD5 (\"%s\") = ", test[i]);
88 for (di = 0; di < 16; ++di)
89 sprintf(hex_output + di * 2, "%02x", digest[di]);
90 puts(hex_output);
91 if (strcmp(hex_output, test[i + 1]))
92 printf("**** ERROR, should be: %s\n", test[i + 1]);
93 }
94 return 0;
95}
96#endif /* TEST */
97
98
99/*
100 * For reference, here is the program that computed the T values.
101 */
102#ifdef COMPUTE_T_VALUES
103#include <math.h>
104int
105 main(void)
106{
107 int i;
108 for (i = 1; i <= 64; ++i) {
109 unsigned long v = (unsigned long)(4294967296.0 * fabs(sin((double)i)));
110
111 /*
112 * The following nonsense is only to avoid compiler warnings about
113 * "integer constant is unsigned in ANSI C, signed with -traditional".
114 */
115 if (v >> 31) {
116 printf("#define T%d /* 0x%08lx */ (T_MASK ^ 0x%08lx)\n", i,
117 v, (unsigned long)(unsigned int)(~v));
118 } else {
119 printf("#define T%d 0x%08lx\n", i, v);
120 }
121 }
122 return 0;
123}
124#endif /* COMPUTE_T_VALUES */
125/*
126 * End of T computation program.
127 */
128#ifdef T_MASK
129#undef T_MASK
130#endif
131#define T_MASK ((uint32_t)~0)
132#define T1 /* 0xd76aa478 */ (T_MASK ^ 0x28955b87)
133#define T2 /* 0xe8c7b756 */ (T_MASK ^ 0x173848a9)
134#define T3 0x242070db
135#define T4 /* 0xc1bdceee */ (T_MASK ^ 0x3e423111)
136#define T5 /* 0xf57c0faf */ (T_MASK ^ 0x0a83f050)
137#define T6 0x4787c62a
138#define T7 /* 0xa8304613 */ (T_MASK ^ 0x57cfb9ec)
139#define T8 /* 0xfd469501 */ (T_MASK ^ 0x02b96afe)
140#define T9 0x698098d8
141#define T10 /* 0x8b44f7af */ (T_MASK ^ 0x74bb0850)
142#define T11 /* 0xffff5bb1 */ (T_MASK ^ 0x0000a44e)
143#define T12 /* 0x895cd7be */ (T_MASK ^ 0x76a32841)
144#define T13 0x6b901122
145#define T14 /* 0xfd987193 */ (T_MASK ^ 0x02678e6c)
146#define T15 /* 0xa679438e */ (T_MASK ^ 0x5986bc71)
147#define T16 0x49b40821
148#define T17 /* 0xf61e2562 */ (T_MASK ^ 0x09e1da9d)
149#define T18 /* 0xc040b340 */ (T_MASK ^ 0x3fbf4cbf)
150#define T19 0x265e5a51
151#define T20 /* 0xe9b6c7aa */ (T_MASK ^ 0x16493855)
152#define T21 /* 0xd62f105d */ (T_MASK ^ 0x29d0efa2)
153#define T22 0x02441453
154#define T23 /* 0xd8a1e681 */ (T_MASK ^ 0x275e197e)
155#define T24 /* 0xe7d3fbc8 */ (T_MASK ^ 0x182c0437)
156#define T25 0x21e1cde6
157#define T26 /* 0xc33707d6 */ (T_MASK ^ 0x3cc8f829)
158#define T27 /* 0xf4d50d87 */ (T_MASK ^ 0x0b2af278)
159#define T28 0x455a14ed
160#define T29 /* 0xa9e3e905 */ (T_MASK ^ 0x561c16fa)
161#define T30 /* 0xfcefa3f8 */ (T_MASK ^ 0x03105c07)
162#define T31 0x676f02d9
163#define T32 /* 0x8d2a4c8a */ (T_MASK ^ 0x72d5b375)
164#define T33 /* 0xfffa3942 */ (T_MASK ^ 0x0005c6bd)
165#define T34 /* 0x8771f681 */ (T_MASK ^ 0x788e097e)
166#define T35 0x6d9d6122
167#define T36 /* 0xfde5380c */ (T_MASK ^ 0x021ac7f3)
168#define T37 /* 0xa4beea44 */ (T_MASK ^ 0x5b4115bb)
169#define T38 0x4bdecfa9
170#define T39 /* 0xf6bb4b60 */ (T_MASK ^ 0x0944b49f)
171#define T40 /* 0xbebfbc70 */ (T_MASK ^ 0x4140438f)
172#define T41 0x289b7ec6
173#define T42 /* 0xeaa127fa */ (T_MASK ^ 0x155ed805)
174#define T43 /* 0xd4ef3085 */ (T_MASK ^ 0x2b10cf7a)
175#define T44 0x04881d05
176#define T45 /* 0xd9d4d039 */ (T_MASK ^ 0x262b2fc6)
177#define T46 /* 0xe6db99e5 */ (T_MASK ^ 0x1924661a)
178#define T47 0x1fa27cf8
179#define T48 /* 0xc4ac5665 */ (T_MASK ^ 0x3b53a99a)
180#define T49 /* 0xf4292244 */ (T_MASK ^ 0x0bd6ddbb)
181#define T50 0x432aff97
182#define T51 /* 0xab9423a7 */ (T_MASK ^ 0x546bdc58)
183#define T52 /* 0xfc93a039 */ (T_MASK ^ 0x036c5fc6)
184#define T53 0x655b59c3
185#define T54 /* 0x8f0ccc92 */ (T_MASK ^ 0x70f3336d)
186#define T55 /* 0xffeff47d */ (T_MASK ^ 0x00100b82)
187#define T56 /* 0x85845dd1 */ (T_MASK ^ 0x7a7ba22e)
188#define T57 0x6fa87e4f
189#define T58 /* 0xfe2ce6e0 */ (T_MASK ^ 0x01d3191f)
190#define T59 /* 0xa3014314 */ (T_MASK ^ 0x5cfebceb)
191#define T60 0x4e0811a1
192#define T61 /* 0xf7537e82 */ (T_MASK ^ 0x08ac817d)
193#define T62 /* 0xbd3af235 */ (T_MASK ^ 0x42c50dca)
194#define T63 0x2ad7d2bb
195#define T64 /* 0xeb86d391 */ (T_MASK ^ 0x14792c6e)
196
197
198static void
199md5_process(MD5_CTX *pms, const uint8_t *data /*[64]*/)
200{
201 uint32_t
202 a = pms->state[0], b = pms->state[1],
203 c = pms->state[2], d = pms->state[3];
204 uint32_t t;
205
206#ifdef WORDS_BIGENDIAN
207
208 /*
209 * On big-endian machines, we must arrange the bytes in the right
210 * order. (This also works on machines of unknown byte order.)
211 */
212 uint32_t X[16];
213 const uint8_t *xp = data;
214 int i;
215
216 for (i = 0; i < 16; ++i, xp += 4)
217 X[i] = xp[0] + (xp[1] << 8) + (xp[2] << 16) + (xp[3] << 24);
218
219#else
220
221 /*
222 * On little-endian machines, we can process properly aligned data
223 * without copying it.
224 */
225 uint32_t xbuf[16];
226 const uint32_t *X;
227
228 if (!((data - (const uint8_t *)0) & 3)) {
229 /* data are properly aligned */
230 X = (const uint32_t *)data;
231 } else {
232 /* not aligned */
233 memcpy(xbuf, data, 64);
234 X = xbuf;
235 }
236#endif
237
238#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32 - (n))))
239
240 /* Round 1. */
241 /* Let [abcd k s i] denote the operation
242 a = b + ((a + F(b,c,d) + X[k] + T[i]) <<< s). */
243#define F(x, y, z) (((x) & (y)) | (~(x) & (z)))
244#define SET(a, b, c, d, k, s, Ti)\
245 t = a + F(b,c,d) + X[k] + Ti;\
246 a = ROTATE_LEFT(t, s) + b
247 /* Do the following 16 operations. */
248 SET(a, b, c, d, 0, 7, T1);
249 SET(d, a, b, c, 1, 12, T2);
250 SET(c, d, a, b, 2, 17, T3);
251 SET(b, c, d, a, 3, 22, T4);
252 SET(a, b, c, d, 4, 7, T5);
253 SET(d, a, b, c, 5, 12, T6);
254 SET(c, d, a, b, 6, 17, T7);
255 SET(b, c, d, a, 7, 22, T8);
256 SET(a, b, c, d, 8, 7, T9);
257 SET(d, a, b, c, 9, 12, T10);
258 SET(c, d, a, b, 10, 17, T11);
259 SET(b, c, d, a, 11, 22, T12);
260 SET(a, b, c, d, 12, 7, T13);
261 SET(d, a, b, c, 13, 12, T14);
262 SET(c, d, a, b, 14, 17, T15);
263 SET(b, c, d, a, 15, 22, T16);
264#undef SET
265
266 /* Round 2. */
267 /* Let [abcd k s i] denote the operation
268 a = b + ((a + G(b,c,d) + X[k] + T[i]) <<< s). */
269#define G(x, y, z) (((x) & (z)) | ((y) & ~(z)))
270#define SET(a, b, c, d, k, s, Ti)\
271 t = a + G(b,c,d) + X[k] + Ti;\
272 a = ROTATE_LEFT(t, s) + b
273 /* Do the following 16 operations. */
274 SET(a, b, c, d, 1, 5, T17);
275 SET(d, a, b, c, 6, 9, T18);
276 SET(c, d, a, b, 11, 14, T19);
277 SET(b, c, d, a, 0, 20, T20);
278 SET(a, b, c, d, 5, 5, T21);
279 SET(d, a, b, c, 10, 9, T22);
280 SET(c, d, a, b, 15, 14, T23);
281 SET(b, c, d, a, 4, 20, T24);
282 SET(a, b, c, d, 9, 5, T25);
283 SET(d, a, b, c, 14, 9, T26);
284 SET(c, d, a, b, 3, 14, T27);
285 SET(b, c, d, a, 8, 20, T28);
286 SET(a, b, c, d, 13, 5, T29);
287 SET(d, a, b, c, 2, 9, T30);
288 SET(c, d, a, b, 7, 14, T31);
289 SET(b, c, d, a, 12, 20, T32);
290#undef SET
291
292 /* Round 3. */
293 /* Let [abcd k s t] denote the operation
294 a = b + ((a + H(b,c,d) + X[k] + T[i]) <<< s). */
295#define H(x, y, z) ((x) ^ (y) ^ (z))
296#define SET(a, b, c, d, k, s, Ti)\
297 t = a + H(b,c,d) + X[k] + Ti;\
298 a = ROTATE_LEFT(t, s) + b
299 /* Do the following 16 operations. */
300 SET(a, b, c, d, 5, 4, T33);
301 SET(d, a, b, c, 8, 11, T34);
302 SET(c, d, a, b, 11, 16, T35);
303 SET(b, c, d, a, 14, 23, T36);
304 SET(a, b, c, d, 1, 4, T37);
305 SET(d, a, b, c, 4, 11, T38);
306 SET(c, d, a, b, 7, 16, T39);
307 SET(b, c, d, a, 10, 23, T40);
308 SET(a, b, c, d, 13, 4, T41);
309 SET(d, a, b, c, 0, 11, T42);
310 SET(c, d, a, b, 3, 16, T43);
311 SET(b, c, d, a, 6, 23, T44);
312 SET(a, b, c, d, 9, 4, T45);
313 SET(d, a, b, c, 12, 11, T46);
314 SET(c, d, a, b, 15, 16, T47);
315 SET(b, c, d, a, 2, 23, T48);
316#undef SET
317
318 /* Round 4. */
319 /* Let [abcd k s t] denote the operation
320 a = b + ((a + I(b,c,d) + X[k] + T[i]) <<< s). */
321#define I(x, y, z) ((y) ^ ((x) | ~(z)))
322#define SET(a, b, c, d, k, s, Ti)\
323 t = a + I(b,c,d) + X[k] + Ti;\
324 a = ROTATE_LEFT(t, s) + b
325 /* Do the following 16 operations. */
326 SET(a, b, c, d, 0, 6, T49);
327 SET(d, a, b, c, 7, 10, T50);
328 SET(c, d, a, b, 14, 15, T51);
329 SET(b, c, d, a, 5, 21, T52);
330 SET(a, b, c, d, 12, 6, T53);
331 SET(d, a, b, c, 3, 10, T54);
332 SET(c, d, a, b, 10, 15, T55);
333 SET(b, c, d, a, 1, 21, T56);
334 SET(a, b, c, d, 8, 6, T57);
335 SET(d, a, b, c, 15, 10, T58);
336 SET(c, d, a, b, 6, 15, T59);
337 SET(b, c, d, a, 13, 21, T60);
338 SET(a, b, c, d, 4, 6, T61);
339 SET(d, a, b, c, 11, 10, T62);
340 SET(c, d, a, b, 2, 15, T63);
341 SET(b, c, d, a, 9, 21, T64);
342#undef SET
343
344 /* Then perform the following additions. (That is increment each
345 of the four registers by the value it had before this block
346 was started.) */
347 pms->state[0] += a;
348 pms->state[1] += b;
349 pms->state[2] += c;
350 pms->state[3] += d;
351}
352
353int
354 MD5_Init(MD5_CTX *pms)
355{
356 pms->count[0] = pms->count[1] = 0;
357 pms->state[0] = 0x67452301;
358 pms->state[1] = /*0xefcdab89*/ T_MASK ^ 0x10325476;
359 pms->state[2] = /*0x98badcfe*/ T_MASK ^ 0x67452301;
360 pms->state[3] = 0x10325476;
361 return 1;
362}
363
364void
365 MD5_Update(MD5_CTX *pms, const uint8_t *data, size_t nbytes)
366{
367 const uint8_t *p = data;
368 size_t left = nbytes;
369 size_t offset = (pms->count[0] >> 3) & 63;
370 uint32_t nbits = (uint32_t)(nbytes << 3);
371
372 if (nbytes == 0)
373 return;
374
375 /* Update the message length. */
376 pms->count[1] += nbytes >> 29;
377 pms->count[0] += nbits;
378 if (pms->count[0] < nbits)
379 pms->count[1]++;
380
381 /* Process an initial partial block. */
382 if (offset) {
383 size_t copy = (offset + nbytes > 64 ? 64 - offset : nbytes);
384
385 memcpy(pms->buffer + offset, p, copy);
386 if (offset + copy < 64)
387 return;
388 p += copy;
389 left -= copy;
390 md5_process(pms, pms->buffer);
391 }
392
393 /* Process full blocks. */
394 for (; left >= 64; p += 64, left -= 64)
395 md5_process(pms, p);
396
397 /* Process a final partial block. */
398 if (left)
399 memcpy(pms->buffer, p, left);
400}
401
402int
403 MD5_Finish(MD5_CTX *pms, uint8_t *digest)
404{
405 static const uint8_t pad[64] = {
406 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
407 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
408 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
409 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
410 };
411 uint8_t data[8];
412 size_t i;
413
414 /* Save the length before padding. */
415 for (i = 0; i < 8; ++i)
416 data[i] = (uint8_t)(pms->count[i >> 2] >> ((i & 3) << 3));
417 /* Pad to 56 bytes mod 64. */
418 MD5_Update(pms, pad, ((55 - (pms->count[0] >> 3)) & 63) + 1);
419 /* Append the length. */
420 MD5_Update(pms, data, 8);
421 for (i = 0; i < 16; ++i)
422 digest[i] = (uint8_t)(pms->state[i >> 2] >> ((i & 3) << 3));
423 return 1;
424}
main
int main(void)
Definition: closure_fn0.c:49
memcpy
#define memcpy(d, s, n)
Definition: ffi_common.h:55
long
typedef long(ZCALLBACK *tell_file_func) OF((voidpf opaque
offset
voidpf uLong offset
Definition: ioapi.h:144
math.h
Internal header for Math.
T51
#define T51
Definition: md5.c:182
T46
#define T46
Definition: md5.c:177
T50
#define T50
Definition: md5.c:181
T45
#define T45
Definition: md5.c:176
T56
#define T56
Definition: md5.c:187
T17
#define T17
Definition: md5.c:148
T54
#define T54
Definition: md5.c:185
T20
#define T20
Definition: md5.c:151
T43
#define T43
Definition: md5.c:174
T9
#define T9
Definition: md5.c:140
T14
#define T14
Definition: md5.c:145
T57
#define T57
Definition: md5.c:188
T37
#define T37
Definition: md5.c:168
T2
#define T2
Definition: md5.c:133
T_MASK
#define T_MASK
Definition: md5.c:131
T7
#define T7
Definition: md5.c:138
T61
#define T61
Definition: md5.c:192
T10
#define T10
Definition: md5.c:141
T31
#define T31
Definition: md5.c:162
T62
#define T62
Definition: md5.c:193
T26
#define T26
Definition: md5.c:157
T24
#define T24
Definition: md5.c:155
T44
#define T44
Definition: md5.c:175
T25
#define T25
Definition: md5.c:156
T36
#define T36
Definition: md5.c:167
T18
#define T18
Definition: md5.c:149
T21
#define T21
Definition: md5.c:152
T6
#define T6
Definition: md5.c:137
T3
#define T3
Definition: md5.c:134
T58
#define T58
Definition: md5.c:189
SET
#define SET(a, b, c, d, k, s, Ti)
T29
#define T29
Definition: md5.c:160
T60
#define T60
Definition: md5.c:191
T59
#define T59
Definition: md5.c:190
T5
#define T5
Definition: md5.c:136
T53
#define T53
Definition: md5.c:184
T39
#define T39
Definition: md5.c:170
T38
#define T38
Definition: md5.c:169
T19
#define T19
Definition: md5.c:150
T33
#define T33
Definition: md5.c:164
T49
#define T49
Definition: md5.c:180
T16
#define T16
Definition: md5.c:147
T22
#define T22
Definition: md5.c:153
T55
#define T55
Definition: md5.c:186
T41
#define T41
Definition: md5.c:172
T48
#define T48
Definition: md5.c:179
T4
#define T4
Definition: md5.c:135
T64
#define T64
Definition: md5.c:195
T40
#define T40
Definition: md5.c:171
T47
#define T47
Definition: md5.c:178
T13
#define T13
Definition: md5.c:144
T30
#define T30
Definition: md5.c:161
T11
#define T11
Definition: md5.c:142
T63
#define T63
Definition: md5.c:194
T1
#define T1
Definition: md5.c:132
T35
#define T35
Definition: md5.c:166
T8
#define T8
Definition: md5.c:139
T23
#define T23
Definition: md5.c:154
T42
#define T42
Definition: md5.c:173
T15
#define T15
Definition: md5.c:146
T34
#define T34
Definition: md5.c:165
T27
#define T27
Definition: md5.c:158
T28
#define T28
Definition: md5.c:159
T52
#define T52
Definition: md5.c:183
T32
#define T32
Definition: md5.c:163
T12
#define T12
Definition: md5.c:143
md5.h
MD5_Init
#define MD5_Init
Definition: md5.h:67
MD5_Finish
#define MD5_Finish
Definition: md5.h:69
MD5_Update
#define MD5_Update
Definition: md5.h:68
uint32_t
unsigned int uint32_t
Definition: sha2.h:101
uint8_t
unsigned char uint8_t
Definition: sha2.h:100
strlen
size_t strlen(const char *)
md5_state_s
Definition: md5.h:59
md5_state_s::count
uint32_t count[2]
Definition: md5.h:60
md5_state_s::state
uint32_t state[4]
Definition: md5.h:61
md5_state_s::buffer
uint8_t buffer[64]
Definition: md5.h:62
state
Definition: blast.c:41
t
#define t
Definition: symbol.c:253