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 #include <sys/cdefs.h> 60 __FBSDID("$FreeBSD$"); 61 62 #include <sys/types.h> 63 #include <sys/param.h> 64 #include <arpa/inet.h> 65 #include <pwd.h> 66 #include <string.h> 67 #include "crypt.h" 68 69 /* We can't always assume gcc */ 70 #if defined(__GNUC__) && !defined(lint) 71 #define INLINE inline 72 #else 73 #define INLINE 74 #endif 75 76 77 static const u_char IP[64] = { 78 58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4, 79 62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8, 80 57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3, 81 61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7 82 }; 83 84 static __thread u_char inv_key_perm[64]; 85 static const u_char key_perm[56] = { 86 57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, 87 10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44, 36, 88 63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22, 89 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4 90 }; 91 92 static const u_char key_shifts[16] = { 93 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 94 }; 95 96 static __thread u_char inv_comp_perm[56]; 97 static const u_char comp_perm[48] = { 98 14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10, 99 23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2, 100 41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48, 101 44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32 102 }; 103 104 /* 105 * No E box is used, as it's replaced by some ANDs, shifts, and ORs. 106 */ 107 108 static __thread u_char u_sbox[8][64]; 109 static const u_char sbox[8][64] = { 110 { 111 14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7, 112 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8, 113 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0, 114 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13 115 }, 116 { 117 15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10, 118 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5, 119 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15, 120 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9 121 }, 122 { 123 10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8, 124 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1, 125 13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7, 126 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12 127 }, 128 { 129 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15, 130 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9, 131 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4, 132 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14 133 }, 134 { 135 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9, 136 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6, 137 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14, 138 11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3 139 }, 140 { 141 12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11, 142 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8, 143 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6, 144 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13 145 }, 146 { 147 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1, 148 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6, 149 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2, 150 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12 151 }, 152 { 153 13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7, 154 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2, 155 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8, 156 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11 157 } 158 }; 159 160 static __thread u_char un_pbox[32]; 161 static const u_char pbox[32] = { 162 16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10, 163 2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25 164 }; 165 166 static const u_int32_t bits32[32] = 167 { 168 0x80000000, 0x40000000, 0x20000000, 0x10000000, 169 0x08000000, 0x04000000, 0x02000000, 0x01000000, 170 0x00800000, 0x00400000, 0x00200000, 0x00100000, 171 0x00080000, 0x00040000, 0x00020000, 0x00010000, 172 0x00008000, 0x00004000, 0x00002000, 0x00001000, 173 0x00000800, 0x00000400, 0x00000200, 0x00000100, 174 0x00000080, 0x00000040, 0x00000020, 0x00000010, 175 0x00000008, 0x00000004, 0x00000002, 0x00000001 176 }; 177 178 static const u_char bits8[8] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 }; 179 180 static __thread u_int32_t saltbits; 181 static __thread u_int32_t old_salt; 182 static __thread const u_int32_t *bits28, *bits24; 183 static __thread u_char init_perm[64], final_perm[64]; 184 static __thread u_int32_t en_keysl[16], en_keysr[16]; 185 static __thread u_int32_t de_keysl[16], de_keysr[16]; 186 static __thread int des_initialised = 0; 187 static __thread u_char m_sbox[4][4096]; 188 static __thread u_int32_t psbox[4][256]; 189 static __thread u_int32_t ip_maskl[8][256], ip_maskr[8][256]; 190 static __thread u_int32_t fp_maskl[8][256], fp_maskr[8][256]; 191 static __thread u_int32_t key_perm_maskl[8][128], key_perm_maskr[8][128]; 192 static __thread u_int32_t comp_maskl[8][128], comp_maskr[8][128]; 193 static __thread u_int32_t old_rawkey0, old_rawkey1; 194 195 static const u_char ascii64[] = 196 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; 197 /* 0000000000111111111122222222223333333333444444444455555555556666 */ 198 /* 0123456789012345678901234567890123456789012345678901234567890123 */ 199 200 static INLINE int 201 ascii_to_bin(char ch) 202 { 203 if (ch > 'z') 204 return(0); 205 if (ch >= 'a') 206 return(ch - 'a' + 38); 207 if (ch > 'Z') 208 return(0); 209 if (ch >= 'A') 210 return(ch - 'A' + 12); 211 if (ch > '9') 212 return(0); 213 if (ch >= '.') 214 return(ch - '.'); 215 return(0); 216 } 217 218 static void 219 des_init(void) 220 { 221 int i, j, b, k, inbit, obit; 222 u_int32_t *p, *il, *ir, *fl, *fr; 223 224 old_rawkey0 = old_rawkey1 = 0L; 225 saltbits = 0L; 226 old_salt = 0L; 227 bits24 = (bits28 = bits32 + 4) + 4; 228 229 /* 230 * Invert the S-boxes, reordering the input bits. 231 */ 232 for (i = 0; i < 8; i++) 233 for (j = 0; j < 64; j++) { 234 b = (j & 0x20) | ((j & 1) << 4) | ((j >> 1) & 0xf); 235 u_sbox[i][j] = sbox[i][b]; 236 } 237 238 /* 239 * Convert the inverted S-boxes into 4 arrays of 8 bits. 240 * Each will handle 12 bits of the S-box input. 241 */ 242 for (b = 0; b < 4; b++) 243 for (i = 0; i < 64; i++) 244 for (j = 0; j < 64; j++) 245 m_sbox[b][(i << 6) | j] = 246 (u_char)((u_sbox[(b << 1)][i] << 4) | 247 u_sbox[(b << 1) + 1][j]); 248 249 /* 250 * Set up the initial & final permutations into a useful form, and 251 * initialise the inverted key permutation. 252 */ 253 for (i = 0; i < 64; i++) { 254 init_perm[final_perm[i] = IP[i] - 1] = (u_char)i; 255 inv_key_perm[i] = 255; 256 } 257 258 /* 259 * Invert the key permutation and initialise the inverted key 260 * compression permutation. 261 */ 262 for (i = 0; i < 56; i++) { 263 inv_key_perm[key_perm[i] - 1] = (u_char)i; 264 inv_comp_perm[i] = 255; 265 } 266 267 /* 268 * Invert the key compression permutation. 269 */ 270 for (i = 0; i < 48; i++) { 271 inv_comp_perm[comp_perm[i] - 1] = (u_char)i; 272 } 273 274 /* 275 * Set up the OR-mask arrays for the initial and final permutations, 276 * and for the key initial and compression permutations. 277 */ 278 for (k = 0; k < 8; k++) { 279 for (i = 0; i < 256; i++) { 280 *(il = &ip_maskl[k][i]) = 0L; 281 *(ir = &ip_maskr[k][i]) = 0L; 282 *(fl = &fp_maskl[k][i]) = 0L; 283 *(fr = &fp_maskr[k][i]) = 0L; 284 for (j = 0; j < 8; j++) { 285 inbit = 8 * k + j; 286 if (i & bits8[j]) { 287 if ((obit = init_perm[inbit]) < 32) 288 *il |= bits32[obit]; 289 else 290 *ir |= bits32[obit-32]; 291 if ((obit = final_perm[inbit]) < 32) 292 *fl |= bits32[obit]; 293 else 294 *fr |= bits32[obit - 32]; 295 } 296 } 297 } 298 for (i = 0; i < 128; i++) { 299 *(il = &key_perm_maskl[k][i]) = 0L; 300 *(ir = &key_perm_maskr[k][i]) = 0L; 301 for (j = 0; j < 7; j++) { 302 inbit = 8 * k + j; 303 if (i & bits8[j + 1]) { 304 if ((obit = inv_key_perm[inbit]) == 255) 305 continue; 306 if (obit < 28) 307 *il |= bits28[obit]; 308 else 309 *ir |= bits28[obit - 28]; 310 } 311 } 312 *(il = &comp_maskl[k][i]) = 0L; 313 *(ir = &comp_maskr[k][i]) = 0L; 314 for (j = 0; j < 7; j++) { 315 inbit = 7 * k + j; 316 if (i & bits8[j + 1]) { 317 if ((obit=inv_comp_perm[inbit]) == 255) 318 continue; 319 if (obit < 24) 320 *il |= bits24[obit]; 321 else 322 *ir |= bits24[obit - 24]; 323 } 324 } 325 } 326 } 327 328 /* 329 * Invert the P-box permutation, and convert into OR-masks for 330 * handling the output of the S-box arrays setup above. 331 */ 332 for (i = 0; i < 32; i++) 333 un_pbox[pbox[i] - 1] = (u_char)i; 334 335 for (b = 0; b < 4; b++) 336 for (i = 0; i < 256; i++) { 337 *(p = &psbox[b][i]) = 0L; 338 for (j = 0; j < 8; j++) { 339 if (i & bits8[j]) 340 *p |= bits32[un_pbox[8 * b + j]]; 341 } 342 } 343 344 des_initialised = 1; 345 } 346 347 static void 348 setup_salt(u_int32_t salt) 349 { 350 u_int32_t obit, saltbit; 351 int i; 352 353 if (salt == old_salt) 354 return; 355 old_salt = salt; 356 357 saltbits = 0L; 358 saltbit = 1; 359 obit = 0x800000; 360 for (i = 0; i < 24; i++) { 361 if (salt & saltbit) 362 saltbits |= obit; 363 saltbit <<= 1; 364 obit >>= 1; 365 } 366 } 367 368 static int 369 des_setkey(const char *key) 370 { 371 u_int32_t k0, k1, rawkey0, rawkey1; 372 int shifts, round; 373 374 if (!des_initialised) 375 des_init(); 376 377 rawkey0 = ntohl(*(const u_int32_t *) key); 378 rawkey1 = ntohl(*(const u_int32_t *) (key + 4)); 379 380 if ((rawkey0 | rawkey1) 381 && rawkey0 == old_rawkey0 382 && rawkey1 == old_rawkey1) { 383 /* 384 * Already setup for this key. 385 * This optimisation fails on a zero key (which is weak and 386 * has bad parity anyway) in order to simplify the starting 387 * conditions. 388 */ 389 return(0); 390 } 391 old_rawkey0 = rawkey0; 392 old_rawkey1 = rawkey1; 393 394 /* 395 * Do key permutation and split into two 28-bit subkeys. 396 */ 397 k0 = key_perm_maskl[0][rawkey0 >> 25] 398 | key_perm_maskl[1][(rawkey0 >> 17) & 0x7f] 399 | key_perm_maskl[2][(rawkey0 >> 9) & 0x7f] 400 | key_perm_maskl[3][(rawkey0 >> 1) & 0x7f] 401 | key_perm_maskl[4][rawkey1 >> 25] 402 | key_perm_maskl[5][(rawkey1 >> 17) & 0x7f] 403 | key_perm_maskl[6][(rawkey1 >> 9) & 0x7f] 404 | key_perm_maskl[7][(rawkey1 >> 1) & 0x7f]; 405 k1 = key_perm_maskr[0][rawkey0 >> 25] 406 | key_perm_maskr[1][(rawkey0 >> 17) & 0x7f] 407 | key_perm_maskr[2][(rawkey0 >> 9) & 0x7f] 408 | key_perm_maskr[3][(rawkey0 >> 1) & 0x7f] 409 | key_perm_maskr[4][rawkey1 >> 25] 410 | key_perm_maskr[5][(rawkey1 >> 17) & 0x7f] 411 | key_perm_maskr[6][(rawkey1 >> 9) & 0x7f] 412 | key_perm_maskr[7][(rawkey1 >> 1) & 0x7f]; 413 /* 414 * Rotate subkeys and do compression permutation. 415 */ 416 shifts = 0; 417 for (round = 0; round < 16; round++) { 418 u_int32_t t0, t1; 419 420 shifts += key_shifts[round]; 421 422 t0 = (k0 << shifts) | (k0 >> (28 - shifts)); 423 t1 = (k1 << shifts) | (k1 >> (28 - shifts)); 424 425 de_keysl[15 - round] = 426 en_keysl[round] = comp_maskl[0][(t0 >> 21) & 0x7f] 427 | comp_maskl[1][(t0 >> 14) & 0x7f] 428 | comp_maskl[2][(t0 >> 7) & 0x7f] 429 | comp_maskl[3][t0 & 0x7f] 430 | comp_maskl[4][(t1 >> 21) & 0x7f] 431 | comp_maskl[5][(t1 >> 14) & 0x7f] 432 | comp_maskl[6][(t1 >> 7) & 0x7f] 433 | comp_maskl[7][t1 & 0x7f]; 434 435 de_keysr[15 - round] = 436 en_keysr[round] = comp_maskr[0][(t0 >> 21) & 0x7f] 437 | comp_maskr[1][(t0 >> 14) & 0x7f] 438 | comp_maskr[2][(t0 >> 7) & 0x7f] 439 | comp_maskr[3][t0 & 0x7f] 440 | comp_maskr[4][(t1 >> 21) & 0x7f] 441 | comp_maskr[5][(t1 >> 14) & 0x7f] 442 | comp_maskr[6][(t1 >> 7) & 0x7f] 443 | comp_maskr[7][t1 & 0x7f]; 444 } 445 return(0); 446 } 447 448 static int 449 do_des( u_int32_t l_in, u_int32_t r_in, u_int32_t *l_out, u_int32_t *r_out, int count) 450 { 451 /* 452 * l_in, r_in, l_out, and r_out are in pseudo-"big-endian" format. 453 */ 454 u_int32_t l, r, *kl, *kr, *kl1, *kr1; 455 u_int32_t f, r48l, r48r; 456 int round; 457 458 if (count == 0) { 459 return(1); 460 } else if (count > 0) { 461 /* 462 * Encrypting 463 */ 464 kl1 = en_keysl; 465 kr1 = en_keysr; 466 } else { 467 /* 468 * Decrypting 469 */ 470 count = -count; 471 kl1 = de_keysl; 472 kr1 = de_keysr; 473 } 474 475 /* 476 * Do initial permutation (IP). 477 */ 478 l = ip_maskl[0][l_in >> 24] 479 | ip_maskl[1][(l_in >> 16) & 0xff] 480 | ip_maskl[2][(l_in >> 8) & 0xff] 481 | ip_maskl[3][l_in & 0xff] 482 | ip_maskl[4][r_in >> 24] 483 | ip_maskl[5][(r_in >> 16) & 0xff] 484 | ip_maskl[6][(r_in >> 8) & 0xff] 485 | ip_maskl[7][r_in & 0xff]; 486 r = ip_maskr[0][l_in >> 24] 487 | ip_maskr[1][(l_in >> 16) & 0xff] 488 | ip_maskr[2][(l_in >> 8) & 0xff] 489 | ip_maskr[3][l_in & 0xff] 490 | ip_maskr[4][r_in >> 24] 491 | ip_maskr[5][(r_in >> 16) & 0xff] 492 | ip_maskr[6][(r_in >> 8) & 0xff] 493 | ip_maskr[7][r_in & 0xff]; 494 495 while (count--) { 496 /* 497 * Do each round. 498 */ 499 kl = kl1; 500 kr = kr1; 501 round = 16; 502 while (round--) { 503 /* 504 * Expand R to 48 bits (simulate the E-box). 505 */ 506 r48l = ((r & 0x00000001) << 23) 507 | ((r & 0xf8000000) >> 9) 508 | ((r & 0x1f800000) >> 11) 509 | ((r & 0x01f80000) >> 13) 510 | ((r & 0x001f8000) >> 15); 511 512 r48r = ((r & 0x0001f800) << 7) 513 | ((r & 0x00001f80) << 5) 514 | ((r & 0x000001f8) << 3) 515 | ((r & 0x0000001f) << 1) 516 | ((r & 0x80000000) >> 31); 517 /* 518 * Do salting for crypt() and friends, and 519 * XOR with the permuted key. 520 */ 521 f = (r48l ^ r48r) & saltbits; 522 r48l ^= f ^ *kl++; 523 r48r ^= f ^ *kr++; 524 /* 525 * Do sbox lookups (which shrink it back to 32 bits) 526 * and do the pbox permutation at the same time. 527 */ 528 f = psbox[0][m_sbox[0][r48l >> 12]] 529 | psbox[1][m_sbox[1][r48l & 0xfff]] 530 | psbox[2][m_sbox[2][r48r >> 12]] 531 | psbox[3][m_sbox[3][r48r & 0xfff]]; 532 /* 533 * Now that we've permuted things, complete f(). 534 */ 535 f ^= l; 536 l = r; 537 r = f; 538 } 539 r = l; 540 l = f; 541 } 542 /* 543 * Do final permutation (inverse of IP). 544 */ 545 *l_out = fp_maskl[0][l >> 24] 546 | fp_maskl[1][(l >> 16) & 0xff] 547 | fp_maskl[2][(l >> 8) & 0xff] 548 | fp_maskl[3][l & 0xff] 549 | fp_maskl[4][r >> 24] 550 | fp_maskl[5][(r >> 16) & 0xff] 551 | fp_maskl[6][(r >> 8) & 0xff] 552 | fp_maskl[7][r & 0xff]; 553 *r_out = fp_maskr[0][l >> 24] 554 | fp_maskr[1][(l >> 16) & 0xff] 555 | fp_maskr[2][(l >> 8) & 0xff] 556 | fp_maskr[3][l & 0xff] 557 | fp_maskr[4][r >> 24] 558 | fp_maskr[5][(r >> 16) & 0xff] 559 | fp_maskr[6][(r >> 8) & 0xff] 560 | fp_maskr[7][r & 0xff]; 561 return(0); 562 } 563 564 static int 565 des_cipher(const char *in, char *out, u_long salt, int count) 566 { 567 u_int32_t l_out, r_out, rawl, rawr; 568 int retval; 569 union { 570 u_int32_t *ui32; 571 const char *c; 572 } trans; 573 574 if (!des_initialised) 575 des_init(); 576 577 setup_salt(salt); 578 579 trans.c = in; 580 rawl = ntohl(*trans.ui32++); 581 rawr = ntohl(*trans.ui32); 582 583 retval = do_des(rawl, rawr, &l_out, &r_out, count); 584 585 trans.c = out; 586 *trans.ui32++ = htonl(l_out); 587 *trans.ui32 = htonl(r_out); 588 return(retval); 589 } 590 591 int 592 crypt_des(const char *key, const char *setting, char *buffer) 593 { 594 int i; 595 u_int32_t count, salt, l, r0, r1, keybuf[2]; 596 u_char *q; 597 598 if (!des_initialised) 599 des_init(); 600 601 /* 602 * Copy the key, shifting each character up by one bit 603 * and padding with zeros. 604 */ 605 q = (u_char *)keybuf; 606 while (q - (u_char *)keybuf - 8) { 607 *q++ = *key << 1; 608 if (*key != '\0') 609 key++; 610 } 611 if (des_setkey((char *)keybuf)) 612 return (-1); 613 614 if (*setting == _PASSWORD_EFMT1) { 615 /* 616 * "new"-style: 617 * setting - underscore, 4 bytes of count, 4 bytes of salt 618 * key - unlimited characters 619 */ 620 for (i = 1, count = 0L; i < 5; i++) 621 count |= ascii_to_bin(setting[i]) << ((i - 1) * 6); 622 623 for (i = 5, salt = 0L; i < 9; i++) 624 salt |= ascii_to_bin(setting[i]) << ((i - 5) * 6); 625 626 while (*key) { 627 /* 628 * Encrypt the key with itself. 629 */ 630 if (des_cipher((char *)keybuf, (char *)keybuf, 0L, 1)) 631 return (-1); 632 /* 633 * And XOR with the next 8 characters of the key. 634 */ 635 q = (u_char *)keybuf; 636 while (q - (u_char *)keybuf - 8 && *key) 637 *q++ ^= *key++ << 1; 638 639 if (des_setkey((char *)keybuf)) 640 return (-1); 641 } 642 buffer = stpncpy(buffer, setting, 9); 643 } else { 644 /* 645 * "old"-style: 646 * setting - 2 bytes of salt 647 * key - up to 8 characters 648 */ 649 count = 25; 650 651 salt = (ascii_to_bin(setting[1]) << 6) 652 | ascii_to_bin(setting[0]); 653 654 *buffer++ = setting[0]; 655 /* 656 * If the encrypted password that the salt was extracted from 657 * is only 1 character long, the salt will be corrupted. We 658 * need to ensure that the output string doesn't have an extra 659 * NUL in it! 660 */ 661 *buffer++ = setting[1] ? setting[1] : setting[0]; 662 } 663 setup_salt(salt); 664 /* 665 * Do it. 666 */ 667 if (do_des(0L, 0L, &r0, &r1, (int)count)) 668 return (-1); 669 /* 670 * Now encode the result... 671 */ 672 l = (r0 >> 8); 673 *buffer++ = ascii64[(l >> 18) & 0x3f]; 674 *buffer++ = ascii64[(l >> 12) & 0x3f]; 675 *buffer++ = ascii64[(l >> 6) & 0x3f]; 676 *buffer++ = ascii64[l & 0x3f]; 677 678 l = (r0 << 16) | ((r1 >> 16) & 0xffff); 679 *buffer++ = ascii64[(l >> 18) & 0x3f]; 680 *buffer++ = ascii64[(l >> 12) & 0x3f]; 681 *buffer++ = ascii64[(l >> 6) & 0x3f]; 682 *buffer++ = ascii64[l & 0x3f]; 683 684 l = r1 << 2; 685 *buffer++ = ascii64[(l >> 12) & 0x3f]; 686 *buffer++ = ascii64[(l >> 6) & 0x3f]; 687 *buffer++ = ascii64[l & 0x3f]; 688 *buffer = '\0'; 689 690 return (0); 691 } 692