1 /* md5.c - an implementation of the MD5 algorithm and MD5 crypt */
3 * GRUB -- GRand Unified Bootloader
4 * Copyright (C) 2000 Free Software Foundation, Inc.
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.
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.
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.
21 /* See RFC 1321 for a description of the MD5 algorithm.
29 # define USE_MD5_PASSWORDS
33 #ifdef USE_MD5_PASSWORDS
38 #define cpu_to_le32(x) le32_to_cpu((x))
39 unsigned long le32_to_cpu(unsigned long x)
41 return (((x & 0x000000ffU) << 24) |
42 ((x & 0x0000ff00U) << 8) |
43 ((x & 0x00ff0000U) >> 8) |
44 ((x & 0xff000000U) >> 24));
47 typedef unsigned int UINT4;
49 /* F, G, H and I are basic MD5 functions.
51 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
52 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
53 #define H(x, y, z) ((x) ^ (y) ^ (z))
54 #define I(x, y, z) ((y) ^ ((x) | (~z)))
56 /* ROTATE_LEFT rotates x left n bits.
58 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x >> (32 - (n)))))
60 static UINT4 initstate[4] =
62 0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476
65 static char s1[4] = { 7, 12, 17, 22 };
66 static char s2[4] = { 5, 9, 14, 20 };
67 static char s3[4] = { 4, 11, 16, 23 };
68 static char s4[4] = { 6, 10, 15, 21 };
72 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
73 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
74 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
75 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
76 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
77 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
78 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
79 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
80 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
81 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
82 0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05,
83 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
84 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
85 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
86 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
87 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
90 static const char *b64t =
91 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
93 static UINT4 state[4];
94 static unsigned int length;
95 static unsigned char buffer[64];
98 md5_transform (const unsigned char block[64])
102 const UINT4 *x = (UINT4 *) block;
110 for (i = 0; i < 16; i++)
112 tmp = a + F (b, c, d) + le32_to_cpu (x[i]) + T[i];
113 tmp = ROTATE_LEFT (tmp, s1[i & 3]);
115 a = d; d = c; c = b; b = tmp;
118 for (i = 0, j = 1; i < 16; i++, j += 5)
120 tmp = a + G (b, c, d) + le32_to_cpu (x[j & 15]) + T[i+16];
121 tmp = ROTATE_LEFT (tmp, s2[i & 3]);
123 a = d; d = c; c = b; b = tmp;
126 for (i = 0, j = 5; i < 16; i++, j += 3)
128 tmp = a + H (b, c, d) + le32_to_cpu (x[j & 15]) + T[i+32];
129 tmp = ROTATE_LEFT (tmp, s3[i & 3]);
131 a = d; d = c; c = b; b = tmp;
134 for (i = 0, j = 0; i < 16; i++, j += 7)
136 tmp = a + I (b, c, d) + le32_to_cpu (x[j & 15]) + T[i+48];
137 tmp = ROTATE_LEFT (tmp, s4[i & 3]);
139 a = d; d = c; c = b; b = tmp;
151 memcpy ((char *) state, (char *) initstate, sizeof (initstate));
156 md5_update (const char *input, int inputlen)
158 int buflen = length & 63;
160 if (buflen + inputlen < 64)
162 memcpy (buffer + buflen, input, inputlen);
167 memcpy (buffer + buflen, input, 64 - buflen);
168 md5_transform (buffer);
169 input += 64 - buflen;
170 inputlen -= 64 - buflen;
171 while (inputlen >= 64)
173 md5_transform (input);
177 memcpy (buffer, input, inputlen);
181 static unsigned char *
184 int i, buflen = length & 63;
186 buffer[buflen++] = 0x80;
187 memset (buffer+buflen, 0, 64 - buflen);
190 md5_transform (buffer);
191 memset (buffer, 0, 64);
195 *(UINT4 *) (buffer + 56) = cpu_to_le32 (8 * length);
196 *(UINT4 *) (buffer + 60) = 0;
197 md5_transform (buffer);
199 for (i = 0; i < 4; i++)
200 state[i] = cpu_to_le32 (state[i]);
201 return (unsigned char *) state;
204 #ifdef USE_MD5_PASSWORDS
205 /* If CHECK is true, check a password for correctness. Returns 0
206 if password was correct, and a value != 0 for error, similarly
208 If CHECK is false, crypt KEY and save the result in CRYPTED.
209 CRYPTED must have a salt. */
211 md5_password (const char *key, char *crypted, int check)
213 int keylen = strlen (key);
214 char *salt = crypted + 3; /* skip $1$ header */
218 unsigned char alt_result[16];
219 unsigned char *digest;
222 saltlen = strstr (salt, "$") - salt;
225 char *end = strstr (salt, "$");
226 if (end && end - salt < 8)
227 saltlen = end - salt;
235 md5_update (key, keylen);
236 md5_update (salt, saltlen);
237 md5_update (key, keylen);
238 digest = md5_final ();
239 memcpy (alt_result, digest, 16);
241 memcpy ((char *) state, (char *) initstate, sizeof (initstate));
243 md5_update (key, keylen);
244 md5_update (crypted, 3 + saltlen); /* include the $1$ header */
245 for (i = keylen; i > 16; i -= 16)
246 md5_update (alt_result, 16);
247 md5_update (alt_result, i);
249 for (i = keylen; i > 0; i >>= 1)
250 md5_update (key + ((i & 1) ? keylen : 0), 1);
251 digest = md5_final ();
253 for (i = 0; i < 1000; i++)
255 memcpy (alt_result, digest, 16);
257 memcpy ((char *) state, (char *) initstate, sizeof (initstate));
260 md5_update (key, keylen);
262 md5_update (alt_result, 16);
265 md5_update (salt, saltlen);
268 md5_update (key, keylen);
271 md5_update (alt_result, 16);
273 md5_update (key, keylen);
274 digest = md5_final ();
277 p = salt + saltlen + 1;
278 for (i = 0; i < 5; i++)
281 digest[i == 4 ? 5 : 12+i] | (digest[6+i] << 8) | (digest[i] << 16);
282 for (n = 4; n-- > 0;)
286 if (*p++ != b64t[w & 0x3f])
291 *p++ = b64t[w & 0x3f];
298 unsigned int w = digest[11];
299 for (n = 2; n-- > 0;)
303 if (*p++ != b64t[w & 0x3f])
308 *p++ = b64t[w & 0x3f];
324 md5 (const char *input)
326 memcpy ((char *) state, (char *) initstate, sizeof (initstate));
328 md5_update (input, strlen (input));
333 test (char *buffer, char *expected)
335 char result[16 * 3 +1];
336 unsigned char* digest = md5 (buffer);
339 for (i=0; i < 16; i++)
340 sprintf (result+2*i, "%02x", digest[i]);
342 if (strcmp (result, expected))
343 printf ("MD5(%s) failed: %s\n", buffer, result);
345 printf ("MD5(%s) OK\n", buffer);
351 test ("", "d41d8cd98f00b204e9800998ecf8427e");
352 test ("a", "0cc175b9c0f1b6a831c399e269772661");
353 test ("abc", "900150983cd24fb0d6963f7d28e17f72");
354 test ("message digest", "f96b697d7cb7938d525a2f31aaf161d0");
355 test ("abcdefghijklmnopqrstuvwxyz", "c3fcd3d76192e4007dfb496cca67e13b");
356 test ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
357 "d174ab98d277d9f5a5611c2c9f419d9f");
358 test ("12345678901234567890123456789012345678901234567890123456789012345678901234567890",
359 "57edf4a22be3c955ac49da2e2107b67a");
360 test ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz3456",
361 "6831fa90115bb9a54fbcd4f9fee0b5c4");
362 test ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz345",
363 "bc40505cc94a43b7ff3e2ac027325233");
364 test ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz34567",
365 "fa94b73a6f072a0239b52acacfbcf9fa");
366 test ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz345678901234",
367 "bd201eae17f29568927414fa326f1267");
368 test ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz34567890123",
369 "80063db1e6b70a2e91eac903f0e46b85");
371 if (check_md5_password ("Hello world!",
372 "$1$saltstri$YMyguxXMBpd2TEZ.vS/3q1"))
373 printf ("Password differs\n");
375 printf ("Password OK\n");