Update build for OpenSSL-1.0.0b import.
[dragonfly.git] / secure / lib / libcrypt / crypt-blowfish.c
CommitLineData
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1/*
2 * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Niels Provos.
16 * 4. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 *
30 * $FreeBSD: src/secure/lib/libcrypt/crypt-blowfish.c,v 1.1.2.1 2001/05/24 12:20:03 markm Exp $
3eefb696 31 * $DragonFly: src/secure/lib/libcrypt/crypt-blowfish.c,v 1.3 2003/11/14 03:54:32 dillon Exp $
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32 */
33
34/* This password hashing algorithm was designed by David Mazieres
35 * <dm@lcs.mit.edu> and works as follows:
36 *
37 * 1. state := InitState ()
38 * 2. state := ExpandKey (state, salt, password) 3.
39 * REPEAT rounds:
40 * state := ExpandKey (state, 0, salt)
41 * state := ExpandKey(state, 0, password)
42 * 4. ctext := "OrpheanBeholderScryDoubt"
43 * 5. REPEAT 64:
44 * ctext := Encrypt_ECB (state, ctext);
45 * 6. RETURN Concatenate (salt, ctext);
46 *
47 */
48
49/*
50 * FreeBSD implementation by Paul Herman <pherman@frenchfries.net>
51 */
52
53#if 0
54#include <stdio.h>
55#endif
56
57#include <stdio.h>
58#include <stdlib.h>
59#include <sys/types.h>
60#include <string.h>
61#include <pwd.h>
62#include "blowfish.h"
63
64/* This implementation is adaptable to current computing power.
65 * You can have up to 2^31 rounds which should be enough for some
66 * time to come.
67 */
68
69#define BCRYPT_VERSION '2'
70#define BCRYPT_MAXSALT 16 /* Precomputation is just so nice */
71#define BCRYPT_BLOCKS 6 /* Ciphertext blocks */
72#define BCRYPT_MINROUNDS 16 /* we have log2(rounds) in salt */
73
3eefb696 74char *bcrypt_gensalt (u_int8_t);
984263bc 75
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76static void encode_salt (char *, u_int8_t *, u_int16_t, u_int8_t);
77static void encode_base64 (u_int8_t *, u_int8_t *, u_int16_t);
78static void decode_base64 (u_int8_t *, u_int16_t, u_int8_t *);
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79
80static char encrypted[_PASSWORD_LEN];
81static char gsalt[BCRYPT_MAXSALT * 4 / 3 + 1];
82static char error[] = ":";
83
84const static u_int8_t Base64Code[] =
85"./ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
86
87const static u_int8_t index_64[128] =
88{
89 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
90 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
91 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
92 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
93 255, 255, 255, 255, 255, 255, 0, 1, 54, 55,
94 56, 57, 58, 59, 60, 61, 62, 63, 255, 255,
95 255, 255, 255, 255, 255, 2, 3, 4, 5, 6,
96 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
97 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27,
98 255, 255, 255, 255, 255, 255, 28, 29, 30,
99 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
100 41, 42, 43, 44, 45, 46, 47, 48, 49, 50,
101 51, 52, 53, 255, 255, 255, 255, 255
102};
103#define CHAR64(c) ( (c) > 127 ? 255 : index_64[(c)])
104
105#ifdef __STDC__
106static void
107decode_base64(u_int8_t *buffer, u_int16_t len, u_int8_t *data)
108#else
109static void
110decode_base64(buffer, len, data)
111 u_int8_t *buffer;
112 u_int16_t len;
113 u_int8_t *data;
114#endif
115{
116 u_int8_t *bp = buffer;
117 u_int8_t *p = data;
118 u_int8_t c1, c2, c3, c4;
119 while (bp < buffer + len) {
120 c1 = CHAR64(*p);
121 c2 = CHAR64(*(p + 1));
122
123 /* Invalid data */
124 if (c1 == 255 || c2 == 255)
125 break;
126
127 *bp++ = (c1 << 2) | ((c2 & 0x30) >> 4);
128 if (bp >= buffer + len)
129 break;
130
131 c3 = CHAR64(*(p + 2));
132 if (c3 == 255)
133 break;
134
135 *bp++ = ((c2 & 0x0f) << 4) | ((c3 & 0x3c) >> 2);
136 if (bp >= buffer + len)
137 break;
138
139 c4 = CHAR64(*(p + 3));
140 if (c4 == 255)
141 break;
142 *bp++ = ((c3 & 0x03) << 6) | c4;
143
144 p += 4;
145 }
146}
147
148#ifdef __STDC__
149static void
150encode_salt(char *salt, u_int8_t *csalt, u_int16_t clen, u_int8_t logr)
151#else
152static void
153encode_salt(salt, csalt, clen, logr)
154 char *salt;
155 u_int8_t *csalt;
156 u_int16_t clen;
157 u_int8_t logr;
158#endif
159{
160 salt[0] = '$';
161 salt[1] = BCRYPT_VERSION;
162 salt[2] = 'a';
163 salt[3] = '$';
164
165 snprintf(salt + 4, 4, "%2.2u$", logr);
166
167 encode_base64((u_int8_t *) salt + 7, csalt, clen);
168}
169/* Generates a salt for this version of crypt.
170 Since versions may change. Keeping this here
171 seems sensible.
172 */
173
174#ifdef __STDC__
175char *
176bcrypt_gensalt(u_int8_t log_rounds)
177#else
178char *
179bcrypt_gensalt(log_rounds)
180 u_int8_t log_rounds;
181#endif
182{
183 u_int8_t csalt[BCRYPT_MAXSALT];
184 u_int16_t i;
185 u_int32_t seed = 0;
186
187 for (i = 0; i < BCRYPT_MAXSALT; i++) {
188 if (i % 4 == 0)
189 seed = arc4random();
190 csalt[i] = seed & 0xff;
191 seed = seed >> 8;
192 }
193
194 if (log_rounds < 4)
195 log_rounds = 4;
196
197 encode_salt(gsalt, csalt, BCRYPT_MAXSALT, log_rounds);
198 return gsalt;
199}
200/* We handle $Vers$log2(NumRounds)$salt+passwd$
201 i.e. $2$04$iwouldntknowwhattosayetKdJ6iFtacBqJdKe6aW7ou */
202
203char *
204crypt_blowfish(key, salt)
205 const char *key;
206 const char *salt;
207{
208 blf_ctx state;
209 u_int32_t rounds, i, k;
210 u_int16_t j;
211 u_int8_t key_len, salt_len, logr, minor;
212 u_int8_t ciphertext[4 * BCRYPT_BLOCKS] = "OrpheanBeholderScryDoubt";
213 u_int8_t csalt[BCRYPT_MAXSALT];
214 u_int32_t cdata[BCRYPT_BLOCKS];
215 static char *magic = "$2a$04$";
216
217 /* Defaults */
218 minor = 'a';
219 logr = 4;
220 rounds = 1 << logr;
221
222 /* If it starts with the magic string, then skip that */
223 if(!strncmp(salt, magic, strlen(magic))) {
224 salt += strlen(magic);
225 }
226 else if (*salt == '$') {
227
228 /* Discard "$" identifier */
229 salt++;
230
231 if (*salt > BCRYPT_VERSION) {
232 /* How do I handle errors ? Return ':' */
233 return error;
234 }
235
236 /* Check for minor versions */
237 if (salt[1] != '$') {
238 switch (salt[1]) {
239 case 'a':
240 /* 'ab' should not yield the same as 'abab' */
241 minor = salt[1];
242 salt++;
243 break;
244 default:
245 return error;
246 }
247 } else
248 minor = 0;
249
250 /* Discard version + "$" identifier */
251 salt += 2;
252
253 if (salt[2] != '$')
254 /* Out of sync with passwd entry */
255 return error;
256
257 /* Computer power doesnt increase linear, 2^x should be fine */
258 if ((rounds = (u_int32_t) 1 << (logr = atoi(salt))) < BCRYPT_MINROUNDS)
259 return error;
260
261 /* Discard num rounds + "$" identifier */
262 salt += 3;
263 }
264
265
266 /* We dont want the base64 salt but the raw data */
267 decode_base64(csalt, BCRYPT_MAXSALT, (u_int8_t *) salt);
268 salt_len = BCRYPT_MAXSALT;
269 key_len = strlen(key) + (minor >= 'a' ? 1 : 0);
270
271 /* Setting up S-Boxes and Subkeys */
272 Blowfish_initstate(&state);
273 Blowfish_expandstate(&state, csalt, salt_len,
274 (u_int8_t *) key, key_len);
275 for (k = 0; k < rounds; k++) {
276 Blowfish_expand0state(&state, (u_int8_t *) key, key_len);
277 Blowfish_expand0state(&state, csalt, salt_len);
278 }
279
280 /* This can be precomputed later */
281 j = 0;
282 for (i = 0; i < BCRYPT_BLOCKS; i++)
283 cdata[i] = Blowfish_stream2word(ciphertext, 4 * BCRYPT_BLOCKS, &j);
284
285 /* Now do the encryption */
286 for (k = 0; k < 64; k++)
287 blf_enc(&state, cdata, BCRYPT_BLOCKS / 2);
288
289 for (i = 0; i < BCRYPT_BLOCKS; i++) {
290 ciphertext[4 * i + 3] = cdata[i] & 0xff;
291 cdata[i] = cdata[i] >> 8;
292 ciphertext[4 * i + 2] = cdata[i] & 0xff;
293 cdata[i] = cdata[i] >> 8;
294 ciphertext[4 * i + 1] = cdata[i] & 0xff;
295 cdata[i] = cdata[i] >> 8;
296 ciphertext[4 * i + 0] = cdata[i] & 0xff;
297 }
298
299
300 i = 0;
301 encrypted[i++] = '$';
302 encrypted[i++] = BCRYPT_VERSION;
303 if (minor)
304 encrypted[i++] = minor;
305 encrypted[i++] = '$';
306
307 snprintf(encrypted + i, 4, "%2.2u$", logr);
308
309 encode_base64((u_int8_t *) encrypted + i + 3, csalt, BCRYPT_MAXSALT);
310 encode_base64((u_int8_t *) encrypted + strlen(encrypted), ciphertext,
311 4 * BCRYPT_BLOCKS - 1);
312 return encrypted;
313}
314
315#ifdef __STDC__
316static void
317encode_base64(u_int8_t *buffer, u_int8_t *data, u_int16_t len)
318#else
319static void
320encode_base64(buffer, data, len)
321 u_int8_t *buffer;
322 u_int8_t *data;
323 u_int16_t len;
324#endif
325{
326 u_int8_t *bp = buffer;
327 u_int8_t *p = data;
328 u_int8_t c1, c2;
329 while (p < data + len) {
330 c1 = *p++;
331 *bp++ = Base64Code[(c1 >> 2)];
332 c1 = (c1 & 0x03) << 4;
333 if (p >= data + len) {
334 *bp++ = Base64Code[c1];
335 break;
336 }
337 c2 = *p++;
338 c1 |= (c2 >> 4) & 0x0f;
339 *bp++ = Base64Code[c1];
340 c1 = (c2 & 0x0f) << 2;
341 if (p >= data + len) {
342 *bp++ = Base64Code[c1];
343 break;
344 }
345 c2 = *p++;
346 c1 |= (c2 >> 6) & 0x03;
347 *bp++ = Base64Code[c1];
348 *bp++ = Base64Code[c2 & 0x3f];
349 }
350 *bp = '\0';
351}
352#if 0
353void
354main()
355{
356 char blubber[73];
357 char salt[100];
358 char *p;
359 salt[0] = '$';
360 salt[1] = BCRYPT_VERSION;
361 salt[2] = '$';
362
363 snprintf(salt + 3, 4, "%2.2u$", 5);
364
365 printf("24 bytes of salt: ");
366 fgets(salt + 6, 94, stdin);
367 salt[99] = 0;
368 printf("72 bytes of password: ");
369 fpurge(stdin);
370 fgets(blubber, 73, stdin);
371 blubber[72] = 0;
372
373 p = crypt(blubber, salt);
374 printf("Passwd entry: %s\n\n", p);
375
376 p = bcrypt_gensalt(5);
377 printf("Generated salt: %s\n", p);
378 p = crypt(blubber, p);
379 printf("Passwd entry: %s\n", p);
380}
381#endif