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45516216 | 1 | /* |
2 | * FreeSec: libcrypt for NetBSD | |
3 | * | |
4 | * Copyright (c) 1994 David Burren | |
5 | * All rights reserved. | |
6 | * | |
7 | * Adapted for FreeBSD-2.0 by Geoffrey M. Rehmet | |
8 | * this file should now *only* export crypt(), in order to make | |
9 | * binaries of libcrypt exportable from the USA | |
10 | * | |
11 | * Adapted for FreeBSD-4.0 by Mark R V Murray | |
12 | * this file should now *only* export crypt_des(), in order to make | |
13 | * a module that can be optionally included in libcrypt. | |
14 | * | |
15 | * Redistribution and use in source and binary forms, with or without | |
16 | * modification, are permitted provided that the following conditions | |
17 | * are met: | |
18 | * 1. Redistributions of source code must retain the above copyright | |
19 | * notice, this list of conditions and the following disclaimer. | |
20 | * 2. Redistributions in binary form must reproduce the above copyright | |
21 | * notice, this list of conditions and the following disclaimer in the | |
22 | * documentation and/or other materials provided with the distribution. | |
23 | * 3. Neither the name of the author nor the names of other contributors | |
24 | * may be used to endorse or promote products derived from this software | |
25 | * without specific prior written permission. | |
26 | * | |
27 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
28 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
29 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
30 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
31 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
32 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
33 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
34 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
35 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
36 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
37 | * SUCH DAMAGE. | |
38 | * | |
39 | * This is an original implementation of the DES and the crypt(3) interfaces | |
40 | * by David Burren <davidb@werj.com.au>. | |
41 | * | |
42 | * An excellent reference on the underlying algorithm (and related | |
43 | * algorithms) is: | |
44 | * | |
45 | * B. Schneier, Applied Cryptography: protocols, algorithms, | |
46 | * and source code in C, John Wiley & Sons, 1994. | |
47 | * | |
48 | * Note that in that book's description of DES the lookups for the initial, | |
49 | * pbox, and final permutations are inverted (this has been brought to the | |
50 | * attention of the author). A list of errata for this book has been | |
51 | * posted to the sci.crypt newsgroup by the author and is available for FTP. | |
52 | * | |
53 | * ARCHITECTURE ASSUMPTIONS: | |
54 | * It is assumed that the 8-byte arrays passed by reference can be | |
55 | * addressed as arrays of u_int32_t's (ie. the CPU is not picky about | |
56 | * alignment). | |
57 | */ | |
58 | ||
59 | #define __FORCE_GLIBC | |
60 | #include <sys/cdefs.h> | |
61 | #include <sys/types.h> | |
62 | #include <sys/param.h> | |
63 | #include <netinet/in.h> | |
64 | #include <pwd.h> | |
65 | #include <string.h> | |
66 | #include <crypt.h> | |
67 | ||
68 | /* prototypes for internal crypt functions | |
69 | * | |
70 | * Copyright (C) 2000-2006 by Erik Andersen <andersen@uclibc.org> | |
71 | * | |
72 | * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. | |
73 | */ | |
74 | ||
75 | #ifndef __LIBCRYPT_H__ | |
76 | #define __LIBCRYPT_H__ | |
77 | ||
78 | extern char *__md5_crypt(const unsigned char *pw, const unsigned char *salt); | |
79 | extern char *__des_crypt(const unsigned char *pw, const unsigned char *salt); | |
80 | ||
81 | /* shut up gcc-4.x signed warnings */ | |
82 | #define strcpy(dst,src) strcpy((char*)dst,(char*)src) | |
83 | #define strlen(s) strlen((char*)s) | |
84 | #define strncat(dst,src,n) strncat((char*)dst,(char*)src,n) | |
85 | #define strncmp(s1,s2,n) strncmp((char*)s1,(char*)s2,n) | |
86 | ||
87 | #endif | |
88 | ||
89 | /* Re-entrantify me -- all this junk needs to be in | |
90 | * struct crypt_data to make this really reentrant... */ | |
91 | static u_char inv_key_perm[64]; | |
92 | static u_char inv_comp_perm[56]; | |
93 | static u_char u_sbox[8][64]; | |
94 | static u_char un_pbox[32]; | |
95 | static u_int32_t en_keysl[16], en_keysr[16]; | |
96 | static u_int32_t de_keysl[16], de_keysr[16]; | |
97 | static u_int32_t ip_maskl[8][256], ip_maskr[8][256]; | |
98 | static u_int32_t fp_maskl[8][256], fp_maskr[8][256]; | |
99 | static u_int32_t key_perm_maskl[8][128], key_perm_maskr[8][128]; | |
100 | static u_int32_t comp_maskl[8][128], comp_maskr[8][128]; | |
101 | static u_int32_t saltbits; | |
102 | static u_int32_t old_salt; | |
103 | static u_int32_t old_rawkey0, old_rawkey1; | |
104 | ||
105 | ||
106 | /* Static stuff that stays resident and doesn't change after | |
107 | * being initialized, and therefore doesn't need to be made | |
108 | * reentrant. */ | |
109 | static u_char init_perm[64], final_perm[64]; | |
110 | static u_char m_sbox[4][4096]; | |
111 | static u_int32_t psbox[4][256]; | |
112 | ||
113 | ||
114 | ||
115 | ||
116 | /* A pile of data */ | |
117 | static const u_char ascii64[] = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; | |
118 | ||
119 | static const u_char IP[64] = { | |
120 | 58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4, | |
121 | 62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8, | |
122 | 57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3, | |
123 | 61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7 | |
124 | }; | |
125 | ||
126 | static const u_char key_perm[56] = { | |
127 | 57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, | |
128 | 10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44, 36, | |
129 | 63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22, | |
130 | 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4 | |
131 | }; | |
132 | ||
133 | static const u_char key_shifts[16] = { | |
134 | 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 | |
135 | }; | |
136 | ||
137 | static const u_char comp_perm[48] = { | |
138 | 14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10, | |
139 | 23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2, | |
140 | 41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48, | |
141 | 44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32 | |
142 | }; | |
143 | ||
144 | /* | |
145 | * No E box is used, as it's replaced by some ANDs, shifts, and ORs. | |
146 | */ | |
147 | ||
148 | static const u_char sbox[8][64] = { | |
149 | { | |
150 | 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7, | |
151 | 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8, | |
152 | 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0, | |
153 | 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13 | |
154 | }, | |
155 | { | |
156 | 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10, | |
157 | 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5, | |
158 | 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15, | |
159 | 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9 | |
160 | }, | |
161 | { | |
162 | 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8, | |
163 | 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1, | |
164 | 13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7, | |
165 | 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12 | |
166 | }, | |
167 | { | |
168 | 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15, | |
169 | 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9, | |
170 | 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4, | |
171 | 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14 | |
172 | }, | |
173 | { | |
174 | 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9, | |
175 | 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6, | |
176 | 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14, | |
177 | 11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3 | |
178 | }, | |
179 | { | |
180 | 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11, | |
181 | 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8, | |
182 | 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6, | |
183 | 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13 | |
184 | }, | |
185 | { | |
186 | 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1, | |
187 | 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6, | |
188 | 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2, | |
189 | 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12 | |
190 | }, | |
191 | { | |
192 | 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7, | |
193 | 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2, | |
194 | 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8, | |
195 | 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11 | |
196 | } | |
197 | }; | |
198 | ||
199 | static const u_char pbox[32] = { | |
200 | 16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10, | |
201 | 2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25 | |
202 | }; | |
203 | ||
204 | static const u_int32_t bits32[32] = | |
205 | { | |
206 | 0x80000000, 0x40000000, 0x20000000, 0x10000000, | |
207 | 0x08000000, 0x04000000, 0x02000000, 0x01000000, | |
208 | 0x00800000, 0x00400000, 0x00200000, 0x00100000, | |
209 | 0x00080000, 0x00040000, 0x00020000, 0x00010000, | |
210 | 0x00008000, 0x00004000, 0x00002000, 0x00001000, | |
211 | 0x00000800, 0x00000400, 0x00000200, 0x00000100, | |
212 | 0x00000080, 0x00000040, 0x00000020, 0x00000010, | |
213 | 0x00000008, 0x00000004, 0x00000002, 0x00000001 | |
214 | }; | |
215 | ||
216 | static const u_char bits8[8] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 }; | |
217 | static const u_int32_t *bits28, *bits24; | |
218 | ||
219 | ||
220 | static int | |
221 | ascii_to_bin(char ch) | |
222 | { | |
223 | if (ch > 'z') | |
224 | return(0); | |
225 | if (ch >= 'a') | |
226 | return(ch - 'a' + 38); | |
227 | if (ch > 'Z') | |
228 | return(0); | |
229 | if (ch >= 'A') | |
230 | return(ch - 'A' + 12); | |
231 | if (ch > '9') | |
232 | return(0); | |
233 | if (ch >= '.') | |
234 | return(ch - '.'); | |
235 | return(0); | |
236 | } | |
237 | ||
238 | static void | |
239 | des_init(void) | |
240 | { | |
241 | int i, j, b, k, inbit, obit; | |
242 | u_int32_t *p, *il, *ir, *fl, *fr; | |
243 | static int des_initialised = 0; | |
244 | ||
245 | if (des_initialised==1) | |
246 | return; | |
247 | ||
248 | old_rawkey0 = old_rawkey1 = 0L; | |
249 | saltbits = 0L; | |
250 | old_salt = 0L; | |
251 | bits24 = (bits28 = bits32 + 4) + 4; | |
252 | ||
253 | /* | |
254 | * Invert the S-boxes, reordering the input bits. | |
255 | */ | |
256 | for (i = 0; i < 8; i++) | |
257 | for (j = 0; j < 64; j++) { | |
258 | b = (j & 0x20) | ((j & 1) << 4) | ((j >> 1) & 0xf); | |
259 | u_sbox[i][j] = sbox[i][b]; | |
260 | } | |
261 | ||
262 | /* | |
263 | * Convert the inverted S-boxes into 4 arrays of 8 bits. | |
264 | * Each will handle 12 bits of the S-box input. | |
265 | */ | |
266 | for (b = 0; b < 4; b++) | |
267 | for (i = 0; i < 64; i++) | |
268 | for (j = 0; j < 64; j++) | |
269 | m_sbox[b][(i << 6) | j] = | |
270 | (u_char)((u_sbox[(b << 1)][i] << 4) | | |
271 | u_sbox[(b << 1) + 1][j]); | |
272 | ||
273 | /* | |
274 | * Set up the initial & final permutations into a useful form, and | |
275 | * initialise the inverted key permutation. | |
276 | */ | |
277 | for (i = 0; i < 64; i++) { | |
278 | init_perm[final_perm[i] = IP[i] - 1] = (u_char)i; | |
279 | inv_key_perm[i] = 255; | |
280 | } | |
281 | ||
282 | /* | |
283 | * Invert the key permutation and initialise the inverted key | |
284 | * compression permutation. | |
285 | */ | |
286 | for (i = 0; i < 56; i++) { | |
287 | inv_key_perm[key_perm[i] - 1] = (u_char)i; | |
288 | inv_comp_perm[i] = 255; | |
289 | } | |
290 | ||
291 | /* | |
292 | * Invert the key compression permutation. | |
293 | */ | |
294 | for (i = 0; i < 48; i++) { | |
295 | inv_comp_perm[comp_perm[i] - 1] = (u_char)i; | |
296 | } | |
297 | ||
298 | /* | |
299 | * Set up the OR-mask arrays for the initial and final permutations, | |
300 | * and for the key initial and compression permutations. | |
301 | */ | |
302 | for (k = 0; k < 8; k++) { | |
303 | for (i = 0; i < 256; i++) { | |
304 | *(il = &ip_maskl[k][i]) = 0L; | |
305 | *(ir = &ip_maskr[k][i]) = 0L; | |
306 | *(fl = &fp_maskl[k][i]) = 0L; | |
307 | *(fr = &fp_maskr[k][i]) = 0L; | |
308 | for (j = 0; j < 8; j++) { | |
309 | inbit = 8 * k + j; | |
310 | if (i & bits8[j]) { | |
311 | if ((obit = init_perm[inbit]) < 32) | |
312 | *il |= bits32[obit]; | |
313 | else | |
314 | *ir |= bits32[obit-32]; | |
315 | if ((obit = final_perm[inbit]) < 32) | |
316 | *fl |= bits32[obit]; | |
317 | else | |
318 | *fr |= bits32[obit - 32]; | |
319 | } | |
320 | } | |
321 | } | |
322 | for (i = 0; i < 128; i++) { | |
323 | *(il = &key_perm_maskl[k][i]) = 0L; | |
324 | *(ir = &key_perm_maskr[k][i]) = 0L; | |
325 | for (j = 0; j < 7; j++) { | |
326 | inbit = 8 * k + j; | |
327 | if (i & bits8[j + 1]) { | |
328 | if ((obit = inv_key_perm[inbit]) == 255) | |
329 | continue; | |
330 | if (obit < 28) | |
331 | *il |= bits28[obit]; | |
332 | else | |
333 | *ir |= bits28[obit - 28]; | |
334 | } | |
335 | } | |
336 | *(il = &comp_maskl[k][i]) = 0L; | |
337 | *(ir = &comp_maskr[k][i]) = 0L; | |
338 | for (j = 0; j < 7; j++) { | |
339 | inbit = 7 * k + j; | |
340 | if (i & bits8[j + 1]) { | |
341 | if ((obit=inv_comp_perm[inbit]) == 255) | |
342 | continue; | |
343 | if (obit < 24) | |
344 | *il |= bits24[obit]; | |
345 | else | |
346 | *ir |= bits24[obit - 24]; | |
347 | } | |
348 | } | |
349 | } | |
350 | } | |
351 | ||
352 | /* | |
353 | * Invert the P-box permutation, and convert into OR-masks for | |
354 | * handling the output of the S-box arrays setup above. | |
355 | */ | |
356 | for (i = 0; i < 32; i++) | |
357 | un_pbox[pbox[i] - 1] = (u_char)i; | |
358 | ||
359 | for (b = 0; b < 4; b++) | |
360 | for (i = 0; i < 256; i++) { | |
361 | *(p = &psbox[b][i]) = 0L; | |
362 | for (j = 0; j < 8; j++) { | |
363 | if (i & bits8[j]) | |
364 | *p |= bits32[un_pbox[8 * b + j]]; | |
365 | } | |
366 | } | |
367 | ||
368 | des_initialised = 1; | |
369 | } | |
370 | ||
371 | ||
372 | static void | |
373 | setup_salt(u_int32_t salt) | |
374 | { | |
375 | u_int32_t obit, saltbit; | |
376 | int i; | |
377 | ||
378 | if (salt == old_salt) | |
379 | return; | |
380 | old_salt = salt; | |
381 | ||
382 | saltbits = 0L; | |
383 | saltbit = 1; | |
384 | obit = 0x800000; | |
385 | for (i = 0; i < 24; i++) { | |
386 | if (salt & saltbit) | |
387 | saltbits |= obit; | |
388 | saltbit <<= 1; | |
389 | obit >>= 1; | |
390 | } | |
391 | } | |
392 | ||
393 | ||
394 | static int | |
395 | des_setkey(const char *key) | |
396 | { | |
397 | u_int32_t k0, k1, rawkey0, rawkey1; | |
398 | int shifts, round; | |
399 | ||
400 | des_init(); | |
401 | ||
402 | rawkey0 = ntohl(*(const u_int32_t *) key); | |
403 | rawkey1 = ntohl(*(const u_int32_t *) (key + 4)); | |
404 | ||
405 | if ((rawkey0 | rawkey1) | |
406 | && rawkey0 == old_rawkey0 | |
407 | && rawkey1 == old_rawkey1) { | |
408 | /* | |
409 | * Already setup for this key. | |
410 | * This optimisation fails on a zero key (which is weak and | |
411 | * has bad parity anyway) in order to simplify the starting | |
412 | * conditions. | |
413 | */ | |
414 | return(0); | |
415 | } | |
416 | old_rawkey0 = rawkey0; | |
417 | old_rawkey1 = rawkey1; | |
418 | ||
419 | /* | |
420 | * Do key permutation and split into two 28-bit subkeys. | |
421 | */ | |
422 | k0 = key_perm_maskl[0][rawkey0 >> 25] | |
423 | | key_perm_maskl[1][(rawkey0 >> 17) & 0x7f] | |
424 | | key_perm_maskl[2][(rawkey0 >> 9) & 0x7f] | |
425 | | key_perm_maskl[3][(rawkey0 >> 1) & 0x7f] | |
426 | | key_perm_maskl[4][rawkey1 >> 25] | |
427 | | key_perm_maskl[5][(rawkey1 >> 17) & 0x7f] | |
428 | | key_perm_maskl[6][(rawkey1 >> 9) & 0x7f] | |
429 | | key_perm_maskl[7][(rawkey1 >> 1) & 0x7f]; | |
430 | k1 = key_perm_maskr[0][rawkey0 >> 25] | |
431 | | key_perm_maskr[1][(rawkey0 >> 17) & 0x7f] | |
432 | | key_perm_maskr[2][(rawkey0 >> 9) & 0x7f] | |
433 | | key_perm_maskr[3][(rawkey0 >> 1) & 0x7f] | |
434 | | key_perm_maskr[4][rawkey1 >> 25] | |
435 | | key_perm_maskr[5][(rawkey1 >> 17) & 0x7f] | |
436 | | key_perm_maskr[6][(rawkey1 >> 9) & 0x7f] | |
437 | | key_perm_maskr[7][(rawkey1 >> 1) & 0x7f]; | |
438 | /* | |
439 | * Rotate subkeys and do compression permutation. | |
440 | */ | |
441 | shifts = 0; | |
442 | for (round = 0; round < 16; round++) { | |
443 | u_int32_t t0, t1; | |
444 | ||
445 | shifts += key_shifts[round]; | |
446 | ||
447 | t0 = (k0 << shifts) | (k0 >> (28 - shifts)); | |
448 | t1 = (k1 << shifts) | (k1 >> (28 - shifts)); | |
449 | ||
450 | de_keysl[15 - round] = | |
451 | en_keysl[round] = comp_maskl[0][(t0 >> 21) & 0x7f] | |
452 | | comp_maskl[1][(t0 >> 14) & 0x7f] | |
453 | | comp_maskl[2][(t0 >> 7) & 0x7f] | |
454 | | comp_maskl[3][t0 & 0x7f] | |
455 | | comp_maskl[4][(t1 >> 21) & 0x7f] | |
456 | | comp_maskl[5][(t1 >> 14) & 0x7f] | |
457 | | comp_maskl[6][(t1 >> 7) & 0x7f] | |
458 | | comp_maskl[7][t1 & 0x7f]; | |
459 | ||
460 | de_keysr[15 - round] = | |
461 | en_keysr[round] = comp_maskr[0][(t0 >> 21) & 0x7f] | |
462 | | comp_maskr[1][(t0 >> 14) & 0x7f] | |
463 | | comp_maskr[2][(t0 >> 7) & 0x7f] | |
464 | | comp_maskr[3][t0 & 0x7f] | |
465 | | comp_maskr[4][(t1 >> 21) & 0x7f] | |
466 | | comp_maskr[5][(t1 >> 14) & 0x7f] | |
467 | | comp_maskr[6][(t1 >> 7) & 0x7f] | |
468 | | comp_maskr[7][t1 & 0x7f]; | |
469 | } | |
470 | return(0); | |
471 | } | |
472 | ||
473 | ||
474 | static int | |
475 | do_des( u_int32_t l_in, u_int32_t r_in, u_int32_t *l_out, u_int32_t *r_out, int count) | |
476 | { | |
477 | /* | |
478 | * l_in, r_in, l_out, and r_out are in pseudo-"big-endian" format. | |
479 | */ | |
480 | u_int32_t l, r, *kl, *kr, *kl1, *kr1; | |
481 | u_int32_t f, r48l, r48r; | |
482 | int round; | |
483 | ||
484 | if (count == 0) { | |
485 | return(1); | |
486 | } else if (count > 0) { | |
487 | /* | |
488 | * Encrypting | |
489 | */ | |
490 | kl1 = en_keysl; | |
491 | kr1 = en_keysr; | |
492 | } else { | |
493 | /* | |
494 | * Decrypting | |
495 | */ | |
496 | count = -count; | |
497 | kl1 = de_keysl; | |
498 | kr1 = de_keysr; | |
499 | } | |
500 | ||
501 | /* | |
502 | * Do initial permutation (IP). | |
503 | */ | |
504 | l = ip_maskl[0][l_in >> 24] | |
505 | | ip_maskl[1][(l_in >> 16) & 0xff] | |
506 | | ip_maskl[2][(l_in >> 8) & 0xff] | |
507 | | ip_maskl[3][l_in & 0xff] | |
508 | | ip_maskl[4][r_in >> 24] | |
509 | | ip_maskl[5][(r_in >> 16) & 0xff] | |
510 | | ip_maskl[6][(r_in >> 8) & 0xff] | |
511 | | ip_maskl[7][r_in & 0xff]; | |
512 | r = ip_maskr[0][l_in >> 24] | |
513 | | ip_maskr[1][(l_in >> 16) & 0xff] | |
514 | | ip_maskr[2][(l_in >> 8) & 0xff] | |
515 | | ip_maskr[3][l_in & 0xff] | |
516 | | ip_maskr[4][r_in >> 24] | |
517 | | ip_maskr[5][(r_in >> 16) & 0xff] | |
518 | | ip_maskr[6][(r_in >> 8) & 0xff] | |
519 | | ip_maskr[7][r_in & 0xff]; | |
520 | ||
521 | while (count--) { | |
522 | /* | |
523 | * Do each round. | |
524 | */ | |
525 | kl = kl1; | |
526 | kr = kr1; | |
527 | round = 16; | |
528 | while (round--) { | |
529 | /* | |
530 | * Expand R to 48 bits (simulate the E-box). | |
531 | */ | |
532 | r48l = ((r & 0x00000001) << 23) | |
533 | | ((r & 0xf8000000) >> 9) | |
534 | | ((r & 0x1f800000) >> 11) | |
535 | | ((r & 0x01f80000) >> 13) | |
536 | | ((r & 0x001f8000) >> 15); | |
537 | ||
538 | r48r = ((r & 0x0001f800) << 7) | |
539 | | ((r & 0x00001f80) << 5) | |
540 | | ((r & 0x000001f8) << 3) | |
541 | | ((r & 0x0000001f) << 1) | |
542 | | ((r & 0x80000000) >> 31); | |
543 | /* | |
544 | * Do salting for crypt() and friends, and | |
545 | * XOR with the permuted key. | |
546 | */ | |
547 | f = (r48l ^ r48r) & saltbits; | |
548 | r48l ^= f ^ *kl++; | |
549 | r48r ^= f ^ *kr++; | |
550 | /* | |
551 | * Do sbox lookups (which shrink it back to 32 bits) | |
552 | * and do the pbox permutation at the same time. | |
553 | */ | |
554 | f = psbox[0][m_sbox[0][r48l >> 12]] | |
555 | | psbox[1][m_sbox[1][r48l & 0xfff]] | |
556 | | psbox[2][m_sbox[2][r48r >> 12]] | |
557 | | psbox[3][m_sbox[3][r48r & 0xfff]]; | |
558 | /* | |
559 | * Now that we've permuted things, complete f(). | |
560 | */ | |
561 | f ^= l; | |
562 | l = r; | |
563 | r = f; | |
564 | } | |
565 | r = l; | |
566 | l = f; | |
567 | } | |
568 | /* | |
569 | * Do final permutation (inverse of IP). | |
570 | */ | |
571 | *l_out = fp_maskl[0][l >> 24] | |
572 | | fp_maskl[1][(l >> 16) & 0xff] | |
573 | | fp_maskl[2][(l >> 8) & 0xff] | |
574 | | fp_maskl[3][l & 0xff] | |
575 | | fp_maskl[4][r >> 24] | |
576 | | fp_maskl[5][(r >> 16) & 0xff] | |
577 | | fp_maskl[6][(r >> 8) & 0xff] | |
578 | | fp_maskl[7][r & 0xff]; | |
579 | *r_out = fp_maskr[0][l >> 24] | |
580 | | fp_maskr[1][(l >> 16) & 0xff] | |
581 | | fp_maskr[2][(l >> 8) & 0xff] | |
582 | | fp_maskr[3][l & 0xff] | |
583 | | fp_maskr[4][r >> 24] | |
584 | | fp_maskr[5][(r >> 16) & 0xff] | |
585 | | fp_maskr[6][(r >> 8) & 0xff] | |
586 | | fp_maskr[7][r & 0xff]; | |
587 | return(0); | |
588 | } | |
589 | ||
590 | ||
591 | #if 0 | |
592 | static int | |
593 | des_cipher(const char *in, char *out, u_int32_t salt, int count) | |
594 | { | |
595 | u_int32_t l_out, r_out, rawl, rawr; | |
596 | int retval; | |
597 | union { | |
598 | u_int32_t *ui32; | |
599 | const char *c; | |
600 | } trans; | |
601 | ||
602 | des_init(); | |
603 | ||
604 | setup_salt(salt); | |
605 | ||
606 | trans.c = in; | |
607 | rawl = ntohl(*trans.ui32++); | |
608 | rawr = ntohl(*trans.ui32); | |
609 | ||
610 | retval = do_des(rawl, rawr, &l_out, &r_out, count); | |
611 | ||
612 | trans.c = out; | |
613 | *trans.ui32++ = htonl(l_out); | |
614 | *trans.ui32 = htonl(r_out); | |
615 | return(retval); | |
616 | } | |
617 | #endif | |
618 | ||
619 | ||
620 | void | |
621 | setkey(const char *key) | |
622 | { | |
623 | int i, j; | |
624 | u_int32_t packed_keys[2]; | |
625 | u_char *p; | |
626 | ||
627 | p = (u_char *) packed_keys; | |
628 | ||
629 | for (i = 0; i < 8; i++) { | |
630 | p[i] = 0; | |
631 | for (j = 0; j < 8; j++) | |
632 | if (*key++ & 1) | |
633 | p[i] |= bits8[j]; | |
634 | } | |
635 | des_setkey((char *)p); | |
636 | } | |
637 | ||
638 | ||
639 | void | |
640 | encrypt(char *block, int flag) | |
641 | { | |
642 | u_int32_t io[2]; | |
643 | u_char *p; | |
644 | int i, j; | |
645 | ||
646 | des_init(); | |
647 | ||
648 | setup_salt(0L); | |
649 | p = (u_char*)block; | |
650 | for (i = 0; i < 2; i++) { | |
651 | io[i] = 0L; | |
652 | for (j = 0; j < 32; j++) | |
653 | if (*p++ & 1) | |
654 | io[i] |= bits32[j]; | |
655 | } | |
656 | do_des(io[0], io[1], io, io + 1, flag ? -1 : 1); | |
657 | for (i = 0; i < 2; i++) | |
658 | for (j = 0; j < 32; j++) | |
659 | block[(i << 5) | j] = (io[i] & bits32[j]) ? 1 : 0; | |
660 | } | |
661 | ||
662 | char *__des_crypt(const unsigned char *key, const unsigned char *setting) | |
663 | { | |
664 | u_int32_t count, salt, l, r0, r1, keybuf[2]; | |
665 | u_char *p, *q; | |
666 | static char output[21]; | |
667 | ||
668 | des_init(); | |
669 | ||
670 | /* | |
671 | * Copy the key, shifting each character up by one bit | |
672 | * and padding with zeros. | |
673 | */ | |
674 | q = (u_char *)keybuf; | |
675 | while (q - (u_char *)keybuf - 8) { | |
676 | *q++ = *key << 1; | |
677 | if (*(q - 1)) | |
678 | key++; | |
679 | } | |
680 | if (des_setkey((char *)keybuf)) | |
681 | return(NULL); | |
682 | ||
683 | #if 0 | |
684 | if (*setting == _PASSWORD_EFMT1) { | |
685 | int i; | |
686 | /* | |
687 | * "new"-style: | |
688 | * setting - underscore, 4 bytes of count, 4 bytes of salt | |
689 | * key - unlimited characters | |
690 | */ | |
691 | for (i = 1, count = 0L; i < 5; i++) | |
692 | count |= ascii_to_bin(setting[i]) << ((i - 1) * 6); | |
693 | ||
694 | for (i = 5, salt = 0L; i < 9; i++) | |
695 | salt |= ascii_to_bin(setting[i]) << ((i - 5) * 6); | |
696 | ||
697 | while (*key) { | |
698 | /* | |
699 | * Encrypt the key with itself. | |
700 | */ | |
701 | if (des_cipher((char *)keybuf, (char *)keybuf, 0L, 1)) | |
702 | return(NULL); | |
703 | /* | |
704 | * And XOR with the next 8 characters of the key. | |
705 | */ | |
706 | q = (u_char *)keybuf; | |
707 | while (q - (u_char *)keybuf - 8 && *key) | |
708 | *q++ ^= *key++ << 1; | |
709 | ||
710 | if (des_setkey((char *)keybuf)) | |
711 | return(NULL); | |
712 | } | |
713 | strncpy(output, setting, 9); | |
714 | ||
715 | /* | |
716 | * Double check that we weren't given a short setting. | |
717 | * If we were, the above code will probably have created | |
718 | * wierd values for count and salt, but we don't really care. | |
719 | * Just make sure the output string doesn't have an extra | |
720 | * NUL in it. | |
721 | */ | |
722 | output[9] = '\0'; | |
723 | p = (u_char *)output + strlen(output); | |
724 | } else | |
725 | #endif | |
726 | { | |
727 | /* | |
728 | * "old"-style: | |
729 | * setting - 2 bytes of salt | |
730 | * key - up to 8 characters | |
731 | */ | |
732 | count = 25; | |
733 | ||
734 | salt = (ascii_to_bin(setting[1]) << 6) | |
735 | | ascii_to_bin(setting[0]); | |
736 | ||
737 | output[0] = setting[0]; | |
738 | /* | |
739 | * If the encrypted password that the salt was extracted from | |
740 | * is only 1 character long, the salt will be corrupted. We | |
741 | * need to ensure that the output string doesn't have an extra | |
742 | * NUL in it! | |
743 | */ | |
744 | output[1] = setting[1] ? setting[1] : output[0]; | |
745 | ||
746 | p = (u_char *)output + 2; | |
747 | } | |
748 | setup_salt(salt); | |
749 | /* | |
750 | * Do it. | |
751 | */ | |
752 | if (do_des(0L, 0L, &r0, &r1, (int)count)) | |
753 | return(NULL); | |
754 | /* | |
755 | * Now encode the result... | |
756 | */ | |
757 | l = (r0 >> 8); | |
758 | *p++ = ascii64[(l >> 18) & 0x3f]; | |
759 | *p++ = ascii64[(l >> 12) & 0x3f]; | |
760 | *p++ = ascii64[(l >> 6) & 0x3f]; | |
761 | *p++ = ascii64[l & 0x3f]; | |
762 | ||
763 | l = (r0 << 16) | ((r1 >> 16) & 0xffff); | |
764 | *p++ = ascii64[(l >> 18) & 0x3f]; | |
765 | *p++ = ascii64[(l >> 12) & 0x3f]; | |
766 | *p++ = ascii64[(l >> 6) & 0x3f]; | |
767 | *p++ = ascii64[l & 0x3f]; | |
768 | ||
769 | l = r1 << 2; | |
770 | *p++ = ascii64[(l >> 12) & 0x3f]; | |
771 | *p++ = ascii64[(l >> 6) & 0x3f]; | |
772 | *p++ = ascii64[l & 0x3f]; | |
773 | *p = 0; | |
774 | ||
775 | return(output); | |
776 | } | |
777 |