1 /*
2 * Private MD5 implementation for CUPS.
3 *
4 * Copyright 2007-2017 by Apple Inc.
5 * Copyright 2005 by Easy Software Products
6 * Copyright (C) 1999 Aladdin Enterprises. All rights reserved.
7 *
8 * This software is provided 'as-is', without any express or implied
9 * warranty. In no event will the authors be held liable for any damages
10 * arising from the use of this software.
11 *
12 * Permission is granted to anyone to use this software for any purpose,
13 * including commercial applications, and to alter it and redistribute it
14 * freely, subject to the following restrictions:
15 *
16 * 1. The origin of this software must not be misrepresented; you must not
17 * claim that you wrote the original software. If you use this software
18 * in a product, an acknowledgment in the product documentation would be
19 * appreciated but is not required.
20 * 2. Altered source versions must be plainly marked as such, and must not be
21 * misrepresented as being the original software.
22 * 3. This notice may not be removed or altered from any source distribution.
23 *
24 * L. Peter Deutsch
25 * ghost@aladdin.com
26 */
27 /*
28 Independent implementation of MD5 (RFC 1321).
29
30 This code implements the MD5 Algorithm defined in RFC 1321.
31 It is derived directly from the text of the RFC and not from the
32 reference implementation.
33
34 The original and principal author of md5.c is L. Peter Deutsch
35 <ghost@aladdin.com>. Other authors are noted in the change history
36 that follows (in reverse chronological order):
37
38 1999-11-04 lpd Edited comments slightly for automatic TOC extraction.
39 1999-10-18 lpd Fixed typo in header comment (ansi2knr rather than md5).
40 1999-05-03 lpd Original version.
41 */
42
43 #include "md5-internal.h"
44 #include "string-private.h"
45
46 #if !defined(__APPLE__)
47 # define T1 0xd76aa478
48 # define T2 0xe8c7b756
49 # define T3 0x242070db
50 # define T4 0xc1bdceee
51 # define T5 0xf57c0faf
52 # define T6 0x4787c62a
53 # define T7 0xa8304613
54 # define T8 0xfd469501
55 # define T9 0x698098d8
56 # define T10 0x8b44f7af
57 # define T11 0xffff5bb1
58 # define T12 0x895cd7be
59 # define T13 0x6b901122
60 # define T14 0xfd987193
61 # define T15 0xa679438e
62 # define T16 0x49b40821
63 # define T17 0xf61e2562
64 # define T18 0xc040b340
65 # define T19 0x265e5a51
66 # define T20 0xe9b6c7aa
67 # define T21 0xd62f105d
68 # define T22 0x02441453
69 # define T23 0xd8a1e681
70 # define T24 0xe7d3fbc8
71 # define T25 0x21e1cde6
72 # define T26 0xc33707d6
73 # define T27 0xf4d50d87
74 # define T28 0x455a14ed
75 # define T29 0xa9e3e905
76 # define T30 0xfcefa3f8
77 # define T31 0x676f02d9
78 # define T32 0x8d2a4c8a
79 # define T33 0xfffa3942
80 # define T34 0x8771f681
81 # define T35 0x6d9d6122
82 # define T36 0xfde5380c
83 # define T37 0xa4beea44
84 # define T38 0x4bdecfa9
85 # define T39 0xf6bb4b60
86 # define T40 0xbebfbc70
87 # define T41 0x289b7ec6
88 # define T42 0xeaa127fa
89 # define T43 0xd4ef3085
90 # define T44 0x04881d05
91 # define T45 0xd9d4d039
92 # define T46 0xe6db99e5
93 # define T47 0x1fa27cf8
94 # define T48 0xc4ac5665
95 # define T49 0xf4292244
96 # define T50 0x432aff97
97 # define T51 0xab9423a7
98 # define T52 0xfc93a039
99 # define T53 0x655b59c3
100 # define T54 0x8f0ccc92
101 # define T55 0xffeff47d
102 # define T56 0x85845dd1
103 # define T57 0x6fa87e4f
104 # define T58 0xfe2ce6e0
105 # define T59 0xa3014314
106 # define T60 0x4e0811a1
107 # define T61 0xf7537e82
108 # define T62 0xbd3af235
109 # define T63 0x2ad7d2bb
110 # define T64 0xeb86d391
111
112 static void
_cups_md5_process(_cups_md5_state_t * pms,const unsigned char * data)113 _cups_md5_process(_cups_md5_state_t *pms, const unsigned char *data /*[64]*/)
114 {
115 unsigned int
116 a = pms->abcd[0], b = pms->abcd[1],
117 c = pms->abcd[2], d = pms->abcd[3];
118 unsigned int t;
119
120 # ifndef ARCH_IS_BIG_ENDIAN
121 # define ARCH_IS_BIG_ENDIAN 1 /* slower, default implementation */
122 # endif
123 # if ARCH_IS_BIG_ENDIAN
124
125 /*
126 * On big-endian machines, we must arrange the bytes in the right
127 * order. (This also works on machines of unknown byte order.)
128 */
129 unsigned int X[16];
130 const unsigned char *xp = data;
131 int i;
132
133 for (i = 0; i < 16; ++i, xp += 4)
134 X[i] = (unsigned)xp[0] + ((unsigned)xp[1] << 8) +
135 ((unsigned)xp[2] << 16) + ((unsigned)xp[3] << 24);
136
137 # else /* !ARCH_IS_BIG_ENDIAN */
138
139 /*
140 * On little-endian machines, we can process properly aligned data
141 * without copying it.
142 */
143 unsigned int xbuf[16];
144 const unsigned int *X;
145
146 if (!((data - (const unsigned char *)0) & 3)) {
147 /* data are properly aligned */
148 X = (const unsigned int *)data;
149 } else {
150 /* not aligned */
151 memcpy(xbuf, data, 64);
152 X = xbuf;
153 }
154 # endif
155
156 # define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32 - (n))))
157
158 /* Round 1. */
159 /* Let [abcd k s i] denote the operation
160 a = b + ((a + F(b,c,d) + X[k] + T[i]) <<< s). */
161 # define F(x, y, z) (((x) & (y)) | (~(x) & (z)))
162 # define SET(a, b, c, d, k, s, Ti)\
163 t = a + F(b,c,d) + X[k] + Ti;\
164 a = ROTATE_LEFT(t, s) + b
165 /* Do the following 16 operations. */
166 SET(a, b, c, d, 0, 7, T1);
167 SET(d, a, b, c, 1, 12, T2);
168 SET(c, d, a, b, 2, 17, T3);
169 SET(b, c, d, a, 3, 22, T4);
170 SET(a, b, c, d, 4, 7, T5);
171 SET(d, a, b, c, 5, 12, T6);
172 SET(c, d, a, b, 6, 17, T7);
173 SET(b, c, d, a, 7, 22, T8);
174 SET(a, b, c, d, 8, 7, T9);
175 SET(d, a, b, c, 9, 12, T10);
176 SET(c, d, a, b, 10, 17, T11);
177 SET(b, c, d, a, 11, 22, T12);
178 SET(a, b, c, d, 12, 7, T13);
179 SET(d, a, b, c, 13, 12, T14);
180 SET(c, d, a, b, 14, 17, T15);
181 SET(b, c, d, a, 15, 22, T16);
182 # undef SET
183
184 /* Round 2. */
185 /* Let [abcd k s i] denote the operation
186 a = b + ((a + G(b,c,d) + X[k] + T[i]) <<< s). */
187 # define G(x, y, z) (((x) & (z)) | ((y) & ~(z)))
188 # define SET(a, b, c, d, k, s, Ti)\
189 t = a + G(b,c,d) + X[k] + Ti;\
190 a = ROTATE_LEFT(t, s) + b
191 /* Do the following 16 operations. */
192 SET(a, b, c, d, 1, 5, T17);
193 SET(d, a, b, c, 6, 9, T18);
194 SET(c, d, a, b, 11, 14, T19);
195 SET(b, c, d, a, 0, 20, T20);
196 SET(a, b, c, d, 5, 5, T21);
197 SET(d, a, b, c, 10, 9, T22);
198 SET(c, d, a, b, 15, 14, T23);
199 SET(b, c, d, a, 4, 20, T24);
200 SET(a, b, c, d, 9, 5, T25);
201 SET(d, a, b, c, 14, 9, T26);
202 SET(c, d, a, b, 3, 14, T27);
203 SET(b, c, d, a, 8, 20, T28);
204 SET(a, b, c, d, 13, 5, T29);
205 SET(d, a, b, c, 2, 9, T30);
206 SET(c, d, a, b, 7, 14, T31);
207 SET(b, c, d, a, 12, 20, T32);
208 # undef SET
209
210 /* Round 3. */
211 /* Let [abcd k s t] denote the operation
212 a = b + ((a + H(b,c,d) + X[k] + T[i]) <<< s). */
213 # define H(x, y, z) ((x) ^ (y) ^ (z))
214 # define SET(a, b, c, d, k, s, Ti)\
215 t = a + H(b,c,d) + X[k] + Ti;\
216 a = ROTATE_LEFT(t, s) + b
217 /* Do the following 16 operations. */
218 SET(a, b, c, d, 5, 4, T33);
219 SET(d, a, b, c, 8, 11, T34);
220 SET(c, d, a, b, 11, 16, T35);
221 SET(b, c, d, a, 14, 23, T36);
222 SET(a, b, c, d, 1, 4, T37);
223 SET(d, a, b, c, 4, 11, T38);
224 SET(c, d, a, b, 7, 16, T39);
225 SET(b, c, d, a, 10, 23, T40);
226 SET(a, b, c, d, 13, 4, T41);
227 SET(d, a, b, c, 0, 11, T42);
228 SET(c, d, a, b, 3, 16, T43);
229 SET(b, c, d, a, 6, 23, T44);
230 SET(a, b, c, d, 9, 4, T45);
231 SET(d, a, b, c, 12, 11, T46);
232 SET(c, d, a, b, 15, 16, T47);
233 SET(b, c, d, a, 2, 23, T48);
234 # undef SET
235
236 /* Round 4. */
237 /* Let [abcd k s t] denote the operation
238 a = b + ((a + I(b,c,d) + X[k] + T[i]) <<< s). */
239 # define I(x, y, z) ((y) ^ ((x) | ~(z)))
240 # define SET(a, b, c, d, k, s, Ti)\
241 t = a + I(b,c,d) + X[k] + Ti;\
242 a = ROTATE_LEFT(t, s) + b
243 /* Do the following 16 operations. */
244 SET(a, b, c, d, 0, 6, T49);
245 SET(d, a, b, c, 7, 10, T50);
246 SET(c, d, a, b, 14, 15, T51);
247 SET(b, c, d, a, 5, 21, T52);
248 SET(a, b, c, d, 12, 6, T53);
249 SET(d, a, b, c, 3, 10, T54);
250 SET(c, d, a, b, 10, 15, T55);
251 SET(b, c, d, a, 1, 21, T56);
252 SET(a, b, c, d, 8, 6, T57);
253 SET(d, a, b, c, 15, 10, T58);
254 SET(c, d, a, b, 6, 15, T59);
255 SET(b, c, d, a, 13, 21, T60);
256 SET(a, b, c, d, 4, 6, T61);
257 SET(d, a, b, c, 11, 10, T62);
258 SET(c, d, a, b, 2, 15, T63);
259 SET(b, c, d, a, 9, 21, T64);
260 # undef SET
261
262 /* Then perform the following additions. (That is increment each
263 of the four registers by the value it had before this block
264 was started.) */
265 pms->abcd[0] += a;
266 pms->abcd[1] += b;
267 pms->abcd[2] += c;
268 pms->abcd[3] += d;
269 }
270
271 void
_cupsMD5Init(_cups_md5_state_t * pms)272 _cupsMD5Init(_cups_md5_state_t *pms)
273 {
274 pms->count[0] = pms->count[1] = 0;
275 pms->abcd[0] = 0x67452301;
276 pms->abcd[1] = 0xefcdab89;
277 pms->abcd[2] = 0x98badcfe;
278 pms->abcd[3] = 0x10325476;
279 }
280
281 void
_cupsMD5Append(_cups_md5_state_t * pms,const unsigned char * data,int nbytes)282 _cupsMD5Append(_cups_md5_state_t *pms, const unsigned char *data, int nbytes)
283 {
284 const unsigned char *p = data;
285 int left = nbytes;
286 int offset = (pms->count[0] >> 3) & 63;
287 unsigned int nbits = (unsigned int)(nbytes << 3);
288
289 if (nbytes <= 0)
290 return;
291
292 /* Update the message length. */
293 pms->count[1] += (unsigned)nbytes >> 29;
294 pms->count[0] += nbits;
295 if (pms->count[0] < nbits)
296 pms->count[1]++;
297
298 /* Process an initial partial block. */
299 if (offset) {
300 int copy = (offset + nbytes > 64 ? 64 - offset : nbytes);
301
302 memcpy(pms->buf + offset, p, (size_t)copy);
303 if (offset + copy < 64)
304 return;
305 p += copy;
306 left -= copy;
307 _cups_md5_process(pms, pms->buf);
308 }
309
310 /* Process full blocks. */
311 for (; left >= 64; p += 64, left -= 64)
312 _cups_md5_process(pms, p);
313
314 /* Process a final partial block. */
315 if (left)
316 memcpy(pms->buf, p, (size_t)left);
317 }
318
319 void
_cupsMD5Finish(_cups_md5_state_t * pms,unsigned char digest[16])320 _cupsMD5Finish(_cups_md5_state_t *pms, unsigned char digest[16])
321 {
322 static const unsigned char pad[64] = {
323 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
324 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
325 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
326 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
327 };
328 unsigned char data[8];
329 int i;
330
331 /* Save the length before padding. */
332 for (i = 0; i < 8; ++i)
333 data[i] = (unsigned char)(pms->count[i >> 2] >> ((i & 3) << 3));
334 /* Pad to 56 bytes mod 64. */
335 _cupsMD5Append(pms, pad, (int)((55 - (pms->count[0] >> 3)) & 63) + 1);
336 /* Append the length. */
337 _cupsMD5Append(pms, data, 8);
338 for (i = 0; i < 16; ++i)
339 digest[i] = (unsigned char)(pms->abcd[i >> 2] >> ((i & 3) << 3));
340 }
341 #endif /* !__APPLE__ */
342