1 /* md5.c - an implementation of the MD5 algorithm and MD5 crypt */
2 /*
3 * GRUB -- GRand Unified Bootloader
4 * Copyright (C) 2000, 2001 Free Software Foundation, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21 /* See RFC 1321 for a description of the MD5 algorithm.
22 */
23
24 #include <md5.h>
25 #ifndef TEST
26 # include <shared.h>
27 #endif
28
29 #ifdef TEST
30 # include <string.h>
31 # define USE_MD5_PASSWORDS
32 # define USE_MD5
33 #endif
34
35 #ifdef USE_MD5_PASSWORDS
36 # define USE_MD5
37 #endif
38
39 #ifdef USE_MD5
40
41 #define cpu_to_le32(x) (x)
42 #define le32_to_cpu(x) cpu_to_le32(x)
43 typedef unsigned int UINT4;
44
45 /* F, G, H and I are basic MD5 functions.
46 */
47 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
48 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
49 #define H(x, y, z) ((x) ^ (y) ^ (z))
50 #define I(x, y, z) ((y) ^ ((x) | (~z)))
51
52 /* ROTATE_LEFT rotates x left n bits.
53 */
54 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x >> (32 - (n)))))
55
56 static UINT4 initstate[4] =
57 {
58 0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476
59 };
60
61 static char s1[4] = { 7, 12, 17, 22 };
62 static char s2[4] = { 5, 9, 14, 20 };
63 static char s3[4] = { 4, 11, 16, 23 };
64 static char s4[4] = { 6, 10, 15, 21 };
65
66 static UINT4 T[64] =
67 {
68 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
69 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
70 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
71 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
72 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
73 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
74 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
75 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
76 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
77 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
78 0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05,
79 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
80 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
81 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
82 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
83 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
84 };
85
86 static const char *b64t =
87 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
88
89 static UINT4 state[4];
90 static unsigned int length;
91 static unsigned char buffer[64];
92
93 static void
md5_transform(const unsigned char block[64])94 md5_transform (const unsigned char block[64])
95 {
96 int i, j;
97 UINT4 a,b,c,d,tmp;
98 const UINT4 *x = (UINT4 *) block;
99
100 a = state[0];
101 b = state[1];
102 c = state[2];
103 d = state[3];
104
105 /* Round 1 */
106 for (i = 0; i < 16; i++)
107 {
108 tmp = a + F (b, c, d) + le32_to_cpu (x[i]) + T[i];
109 tmp = ROTATE_LEFT (tmp, s1[i & 3]);
110 tmp += b;
111 a = d; d = c; c = b; b = tmp;
112 }
113 /* Round 2 */
114 for (i = 0, j = 1; i < 16; i++, j += 5)
115 {
116 tmp = a + G (b, c, d) + le32_to_cpu (x[j & 15]) + T[i+16];
117 tmp = ROTATE_LEFT (tmp, s2[i & 3]);
118 tmp += b;
119 a = d; d = c; c = b; b = tmp;
120 }
121 /* Round 3 */
122 for (i = 0, j = 5; i < 16; i++, j += 3)
123 {
124 tmp = a + H (b, c, d) + le32_to_cpu (x[j & 15]) + T[i+32];
125 tmp = ROTATE_LEFT (tmp, s3[i & 3]);
126 tmp += b;
127 a = d; d = c; c = b; b = tmp;
128 }
129 /* Round 4 */
130 for (i = 0, j = 0; i < 16; i++, j += 7)
131 {
132 tmp = a + I (b, c, d) + le32_to_cpu (x[j & 15]) + T[i+48];
133 tmp = ROTATE_LEFT (tmp, s4[i & 3]);
134 tmp += b;
135 a = d; d = c; c = b; b = tmp;
136 }
137
138 state[0] += a;
139 state[1] += b;
140 state[2] += c;
141 state[3] += d;
142 }
143
144 static void
md5_init(void)145 md5_init(void)
146 {
147 memcpy ((char *) state, (char *) initstate, sizeof (initstate));
148 length = 0;
149 }
150
151 static void
md5_update(const char * input,int inputlen)152 md5_update (const char *input, int inputlen)
153 {
154 int buflen = length & 63;
155 length += inputlen;
156 if (buflen + inputlen < 64)
157 {
158 memcpy (buffer + buflen, input, inputlen);
159 buflen += inputlen;
160 return;
161 }
162
163 memcpy (buffer + buflen, input, 64 - buflen);
164 md5_transform (buffer);
165 input += 64 - buflen;
166 inputlen -= 64 - buflen;
167 while (inputlen >= 64)
168 {
169 md5_transform (input);
170 input += 64;
171 inputlen -= 64;
172 }
173 memcpy (buffer, input, inputlen);
174 buflen = inputlen;
175 }
176
177 static unsigned char *
md5_final()178 md5_final()
179 {
180 int i, buflen = length & 63;
181
182 buffer[buflen++] = 0x80;
183 memset (buffer+buflen, 0, 64 - buflen);
184 if (buflen > 56)
185 {
186 md5_transform (buffer);
187 memset (buffer, 0, 64);
188 buflen = 0;
189 }
190
191 *(UINT4 *) (buffer + 56) = cpu_to_le32 (8 * length);
192 *(UINT4 *) (buffer + 60) = 0;
193 md5_transform (buffer);
194
195 for (i = 0; i < 4; i++)
196 state[i] = cpu_to_le32 (state[i]);
197 return (unsigned char *) state;
198 }
199
200 #ifdef USE_MD5_PASSWORDS
201 /* If CHECK is true, check a password for correctness. Returns 0
202 if password was correct, and a value != 0 for error, similarly
203 to strcmp.
204 If CHECK is false, crypt KEY and save the result in CRYPTED.
205 CRYPTED must have a salt. */
206 int
md5_password(const char * key,char * crypted,int check)207 md5_password (const char *key, char *crypted, int check)
208 {
209 int keylen = strlen (key);
210 char *salt = crypted + 3; /* skip $1$ header */
211 char *p;
212 int saltlen;
213 int i, n;
214 unsigned char alt_result[16];
215 unsigned char *digest;
216
217 if (check)
218 {
219 /* If our crypted password isn't 3 chars, then it can't be md5
220 crypted. So, they don't match. */
221 if (strlen(crypted) <= 3)
222 return 1;
223
224 saltlen = strstr (salt, "$") - salt;
225 }
226 else
227 {
228 char *end = strstr (salt, "$");
229 if (end && end - salt < 8)
230 saltlen = end - salt;
231 else
232 saltlen = 8;
233
234 salt[saltlen] = '$';
235 }
236
237 md5_init ();
238 md5_update (key, keylen);
239 md5_update (salt, saltlen);
240 md5_update (key, keylen);
241 digest = md5_final ();
242 memcpy (alt_result, digest, 16);
243
244 memcpy ((char *) state, (char *) initstate, sizeof (initstate));
245 length = 0;
246 md5_update (key, keylen);
247 md5_update (crypted, 3 + saltlen); /* include the $1$ header */
248 for (i = keylen; i > 16; i -= 16)
249 md5_update (alt_result, 16);
250 md5_update (alt_result, i);
251
252 for (i = keylen; i > 0; i >>= 1)
253 md5_update (key + ((i & 1) ? keylen : 0), 1);
254 digest = md5_final ();
255
256 for (i = 0; i < 1000; i++)
257 {
258 memcpy (alt_result, digest, 16);
259
260 memcpy ((char *) state, (char *) initstate, sizeof (initstate));
261 length = 0;
262 if ((i & 1) != 0)
263 md5_update (key, keylen);
264 else
265 md5_update (alt_result, 16);
266
267 if (i % 3 != 0)
268 md5_update (salt, saltlen);
269
270 if (i % 7 != 0)
271 md5_update (key, keylen);
272
273 if ((i & 1) != 0)
274 md5_update (alt_result, 16);
275 else
276 md5_update (key, keylen);
277 digest = md5_final ();
278 }
279
280 p = salt + saltlen + 1;
281 for (i = 0; i < 5; i++)
282 {
283 unsigned int w =
284 digest[i == 4 ? 5 : 12+i] | (digest[6+i] << 8) | (digest[i] << 16);
285 for (n = 4; n-- > 0;)
286 {
287 if (check)
288 {
289 if (*p++ != b64t[w & 0x3f])
290 return 1;
291 }
292 else
293 {
294 *p++ = b64t[w & 0x3f];
295 }
296
297 w >>= 6;
298 }
299 }
300 {
301 unsigned int w = digest[11];
302 for (n = 2; n-- > 0;)
303 {
304 if (check)
305 {
306 if (*p++ != b64t[w & 0x3f])
307 return 1;
308 }
309 else
310 {
311 *p++ = b64t[w & 0x3f];
312 }
313
314 w >>= 6;
315 }
316 }
317
318 if (! check)
319 *p = '\0';
320
321 return *p;
322 }
323 #endif
324
325 #ifdef TEST
326 static char *
md5(const char * input)327 md5 (const char *input)
328 {
329 memcpy ((char *) state, (char *) initstate, sizeof (initstate));
330 length = 0;
331 md5_update (input, strlen (input));
332 return md5_final ();
333 }
334
335 static void
test(char * buffer,char * expected)336 test (char *buffer, char *expected)
337 {
338 char result[16 * 3 +1];
339 unsigned char* digest = md5 (buffer);
340 int i;
341
342 for (i=0; i < 16; i++)
343 sprintf (result+2*i, "%02x", digest[i]);
344
345 if (strcmp (result, expected))
346 printf ("MD5(%s) failed: %s\n", buffer, result);
347 else
348 printf ("MD5(%s) OK\n", buffer);
349 }
350
351 int
main(void)352 main (void)
353 {
354 test ("", "d41d8cd98f00b204e9800998ecf8427e");
355 test ("a", "0cc175b9c0f1b6a831c399e269772661");
356 test ("abc", "900150983cd24fb0d6963f7d28e17f72");
357 test ("message digest", "f96b697d7cb7938d525a2f31aaf161d0");
358 test ("abcdefghijklmnopqrstuvwxyz", "c3fcd3d76192e4007dfb496cca67e13b");
359 test ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
360 "d174ab98d277d9f5a5611c2c9f419d9f");
361 test ("12345678901234567890123456789012345678901234567890123456789012345678901234567890",
362 "57edf4a22be3c955ac49da2e2107b67a");
363 test ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz3456",
364 "6831fa90115bb9a54fbcd4f9fee0b5c4");
365 test ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz345",
366 "bc40505cc94a43b7ff3e2ac027325233");
367 test ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz34567",
368 "fa94b73a6f072a0239b52acacfbcf9fa");
369 test ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz345678901234",
370 "bd201eae17f29568927414fa326f1267");
371 test ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz34567890123",
372 "80063db1e6b70a2e91eac903f0e46b85");
373
374 if (check_md5_password ("Hello world!",
375 "$1$saltstri$YMyguxXMBpd2TEZ.vS/3q1"))
376 printf ("Password differs\n");
377 else
378 printf ("Password OK\n");
379 return 0;
380 }
381 #endif
382
383 #endif
384