ncurses: Add few missing dependencies.
[dragonfly.git] / lib / libcrypt / crypt-blowfish.c
blobb08442ea0b3c14ae057e46d4cbdd45d3664631c8
1 /*
2 * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
3 * All rights reserved.
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.
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.
30 * $FreeBSD: src/secure/lib/libcrypt/crypt-blowfish.c,v 1.1.2.1 2001/05/24 12:20:03 markm Exp $
33 /* This password hashing algorithm was designed by David Mazieres
34 * <dm@lcs.mit.edu> and works as follows:
36 * 1. state := InitState ()
37 * 2. state := ExpandKey (state, salt, password) 3.
38 * REPEAT rounds:
39 * state := ExpandKey (state, 0, salt)
40 * state := ExpandKey(state, 0, password)
41 * 4. ctext := "OrpheanBeholderScryDoubt"
42 * 5. REPEAT 64:
43 * ctext := Encrypt_ECB (state, ctext);
44 * 6. RETURN Concatenate (salt, ctext);
49 * FreeBSD implementation by Paul Herman <pherman@frenchfries.net>
52 #if 0
53 #include <stdio.h>
54 #endif
56 #include <stdio.h>
57 #include <stdlib.h>
58 #include <sys/types.h>
59 #include <string.h>
60 #include <pwd.h>
61 #include "blowfish.h"
63 /* This implementation is adaptable to current computing power.
64 * You can have up to 2^31 rounds which should be enough for some
65 * time to come.
68 #define BCRYPT_VERSION '2'
69 #define BCRYPT_MAXSALT 16 /* Precomputation is just so nice */
70 #define BCRYPT_BLOCKS 6 /* Ciphertext blocks */
71 #define BCRYPT_MINROUNDS 16 /* we have log2(rounds) in salt */
73 char *bcrypt_gensalt (u_int8_t);
75 static void encode_salt (char *, u_int8_t *, u_int16_t, u_int8_t);
76 static void encode_base64 (u_int8_t *, u_int8_t *, u_int16_t);
77 static void decode_base64 (u_int8_t *, u_int16_t, u_int8_t *);
79 static char encrypted[_PASSWORD_LEN];
80 static char gsalt[BCRYPT_MAXSALT * 4 / 3 + 1];
82 static const u_int8_t Base64Code[] =
83 "./ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
85 static const u_int8_t index_64[128] =
87 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
88 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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, 0, 1, 54, 55,
92 56, 57, 58, 59, 60, 61, 62, 63, 255, 255,
93 255, 255, 255, 255, 255, 2, 3, 4, 5, 6,
94 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
95 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27,
96 255, 255, 255, 255, 255, 255, 28, 29, 30,
97 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
98 41, 42, 43, 44, 45, 46, 47, 48, 49, 50,
99 51, 52, 53, 255, 255, 255, 255, 255
101 #define CHAR64(c) ( (c) > 127 ? 255 : index_64[(c)])
103 static void
104 decode_base64(u_int8_t *buffer, u_int16_t len, u_int8_t *data)
106 u_int8_t *bp = buffer;
107 u_int8_t *p = data;
108 u_int8_t c1, c2, c3, c4;
109 while (bp < buffer + len) {
110 c1 = CHAR64(*p);
111 c2 = CHAR64(*(p + 1));
113 /* Invalid data */
114 if (c1 == 255 || c2 == 255)
115 break;
117 *bp++ = (c1 << 2) | ((c2 & 0x30) >> 4);
118 if (bp >= buffer + len)
119 break;
121 c3 = CHAR64(*(p + 2));
122 if (c3 == 255)
123 break;
125 *bp++ = ((c2 & 0x0f) << 4) | ((c3 & 0x3c) >> 2);
126 if (bp >= buffer + len)
127 break;
129 c4 = CHAR64(*(p + 3));
130 if (c4 == 255)
131 break;
132 *bp++ = ((c3 & 0x03) << 6) | c4;
134 p += 4;
138 static void
139 encode_salt(char *salt, u_int8_t *csalt, u_int16_t clen, u_int8_t logr)
141 salt[0] = '$';
142 salt[1] = BCRYPT_VERSION;
143 salt[2] = 'a';
144 salt[3] = '$';
146 snprintf(salt + 4, 4, "%2.2u$", logr);
148 encode_base64((u_int8_t *) salt + 7, csalt, clen);
150 /* Generates a salt for this version of crypt.
151 Since versions may change. Keeping this here
152 seems sensible.
155 char *
156 bcrypt_gensalt(u_int8_t log_rounds)
158 u_int8_t csalt[BCRYPT_MAXSALT];
159 u_int16_t i;
160 u_int32_t seed = 0;
162 for (i = 0; i < BCRYPT_MAXSALT; i++) {
163 if (i % 4 == 0)
164 seed = arc4random();
165 csalt[i] = seed & 0xff;
166 seed = seed >> 8;
169 if (log_rounds < 4)
170 log_rounds = 4;
172 encode_salt(gsalt, csalt, BCRYPT_MAXSALT, log_rounds);
173 return gsalt;
175 /* We handle $Vers$log2(NumRounds)$salt+passwd$
176 i.e. $2$04$iwouldntknowwhattosayetKdJ6iFtacBqJdKe6aW7ou */
178 char *
179 crypt_blowfish(const char *key, const char *salt)
181 blf_ctx state;
182 u_int32_t rounds, i, k;
183 u_int16_t j;
184 u_int8_t key_len, salt_len, logr, minor;
185 u_int8_t ciphertext[4 * BCRYPT_BLOCKS] = "OrpheanBeholderScryDoubt";
186 u_int8_t csalt[BCRYPT_MAXSALT];
187 u_int32_t cdata[BCRYPT_BLOCKS];
188 static char *magic = "$2a$04$";
190 /* Defaults */
191 minor = 'a';
192 logr = 4;
193 rounds = 1 << logr;
195 /* If it starts with the magic string, then skip that */
196 if(!strncmp(salt, magic, strlen(magic))) {
197 salt += strlen(magic);
199 else if (*salt == '$') {
201 /* Discard "$" identifier */
202 salt++;
204 if (*salt > BCRYPT_VERSION) {
205 /* How do I handle errors ? Return NULL according to
206 crypt(3) */
207 return NULL;
210 /* Check for minor versions */
211 if (salt[1] != '$') {
212 switch (salt[1]) {
213 case 'a':
214 /* 'ab' should not yield the same as 'abab' */
215 minor = salt[1];
216 salt++;
217 break;
218 default:
219 return NULL;
221 } else
222 minor = 0;
224 /* Discard version + "$" identifier */
225 salt += 2;
227 if (salt[2] != '$')
228 /* Out of sync with passwd entry */
229 return NULL;
231 /* Computer power doesnt increase linear, 2^x should be fine */
232 if ((rounds = (u_int32_t) 1 << (logr = atoi(salt))) < BCRYPT_MINROUNDS)
233 return NULL;
235 /* Discard num rounds + "$" identifier */
236 salt += 3;
240 /* We dont want the base64 salt but the raw data */
241 decode_base64(csalt, BCRYPT_MAXSALT, (u_int8_t *) salt);
242 salt_len = BCRYPT_MAXSALT;
243 key_len = strlen(key) + (minor >= 'a' ? 1 : 0);
245 /* Setting up S-Boxes and Subkeys */
246 Blowfish_initstate(&state);
247 Blowfish_expandstate(&state, csalt, salt_len,
248 (u_int8_t *) key, key_len);
249 for (k = 0; k < rounds; k++) {
250 Blowfish_expand0state(&state, (u_int8_t *) key, key_len);
251 Blowfish_expand0state(&state, csalt, salt_len);
254 /* This can be precomputed later */
255 j = 0;
256 for (i = 0; i < BCRYPT_BLOCKS; i++)
257 cdata[i] = Blowfish_stream2word(ciphertext, 4 * BCRYPT_BLOCKS, &j);
259 /* Now do the encryption */
260 for (k = 0; k < 64; k++)
261 blf_enc(&state, cdata, BCRYPT_BLOCKS / 2);
263 for (i = 0; i < BCRYPT_BLOCKS; i++) {
264 ciphertext[4 * i + 3] = cdata[i] & 0xff;
265 cdata[i] = cdata[i] >> 8;
266 ciphertext[4 * i + 2] = cdata[i] & 0xff;
267 cdata[i] = cdata[i] >> 8;
268 ciphertext[4 * i + 1] = cdata[i] & 0xff;
269 cdata[i] = cdata[i] >> 8;
270 ciphertext[4 * i + 0] = cdata[i] & 0xff;
274 i = 0;
275 encrypted[i++] = '$';
276 encrypted[i++] = BCRYPT_VERSION;
277 if (minor)
278 encrypted[i++] = minor;
279 encrypted[i++] = '$';
281 snprintf(encrypted + i, 4, "%2.2u$", logr);
283 encode_base64((u_int8_t *) encrypted + i + 3, csalt, BCRYPT_MAXSALT);
284 encode_base64((u_int8_t *) encrypted + strlen(encrypted), ciphertext,
285 4 * BCRYPT_BLOCKS - 1);
286 return encrypted;
289 static void
290 encode_base64(u_int8_t *buffer, u_int8_t *data, u_int16_t len)
292 u_int8_t *bp = buffer;
293 u_int8_t *p = data;
294 u_int8_t c1, c2;
295 while (p < data + len) {
296 c1 = *p++;
297 *bp++ = Base64Code[(c1 >> 2)];
298 c1 = (c1 & 0x03) << 4;
299 if (p >= data + len) {
300 *bp++ = Base64Code[c1];
301 break;
303 c2 = *p++;
304 c1 |= (c2 >> 4) & 0x0f;
305 *bp++ = Base64Code[c1];
306 c1 = (c2 & 0x0f) << 2;
307 if (p >= data + len) {
308 *bp++ = Base64Code[c1];
309 break;
311 c2 = *p++;
312 c1 |= (c2 >> 6) & 0x03;
313 *bp++ = Base64Code[c1];
314 *bp++ = Base64Code[c2 & 0x3f];
316 *bp = '\0';
318 #if 0
319 void
320 main()
322 char blubber[73];
323 char salt[100];
324 char *p;
325 salt[0] = '$';
326 salt[1] = BCRYPT_VERSION;
327 salt[2] = '$';
329 snprintf(salt + 3, 4, "%2.2u$", 5);
331 printf("24 bytes of salt: ");
332 fgets(salt + 6, 94, stdin);
333 salt[99] = 0;
334 printf("72 bytes of password: ");
335 fpurge(stdin);
336 fgets(blubber, 73, stdin);
337 blubber[72] = 0;
339 p = crypt(blubber, salt);
340 printf("Passwd entry: %s\n\n", p);
342 p = bcrypt_gensalt(5);
343 printf("Generated salt: %s\n", p);
344 p = crypt(blubber, p);
345 printf("Passwd entry: %s\n", p);
347 #endif