1 /*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Matt Bishop of Dartmouth College. 7 * 8 * The United States Government has rights in this work pursuant 9 * to contract no. NAG 2-680 between the National Aeronautics and 10 * Space Administration and Dartmouth College. 11 * 12 * %sccs.include.redist.c% 13 */ 14 15 #ifndef lint 16 char copyright[] = 17 "@(#) Copyright (c) 1991 The Regents of the University of California.\n\ 18 All rights reserved.\n"; 19 #endif /* not lint */ 20 21 #ifndef lint 22 static char sccsid[] = "@(#)bdes.c 5.4 (Berkeley) 05/06/91"; 23 #endif /* not lint */ 24 25 /* 26 * BDES -- DES encryption package for Berkeley Software Distribution 4.4 27 * options: 28 * -a key is in ASCII 29 * -b use ECB (electronic code book) mode 30 * -d invert (decrypt) input 31 * -f b use b-bit CFB (cipher feedback) mode 32 * -F b use b-bit CFB (cipher feedback) alternative mode 33 * -k key use key as the cryptographic key 34 * -m b generate a MAC of length b 35 * -o b use b-bit OFB (output feedback) mode 36 * -p don't reset the parity bit 37 * -v v use v as the initialization vector (ignored for ECB) 38 * note: the last character of the last block is the integer indicating 39 * how many characters of that block are to be output 40 * 41 * Author: Matt Bishop 42 * Department of Mathematics and Computer Science 43 * Dartmouth College 44 * Hanover, NH 03755 45 * Email: Matt.Bishop@dartmouth.edu 46 * ...!decvax!dartvax!Matt.Bishop 47 * 48 * See Technical Report PCS-TR91-158, Department of Mathematics and Computer 49 * Science, Dartmouth College, for a detailed description of the implemen- 50 * tation and differences between it and Sun's. The DES is described in 51 * FIPS PUB 46, and the modes in FIPS PUB 81 (see either the manual page 52 * or the technical report for a complete reference). 53 */ 54 55 #include <errno.h> 56 #include <unistd.h> 57 #include <stdio.h> 58 #include <ctype.h> 59 #include <stdlib.h> 60 #include <string.h> 61 62 /* 63 * BSD and System V systems offer special library calls that do 64 * block moves and fills, so if possible we take advantage of them 65 */ 66 #define MEMCPY(dest,src,len) bcopy((src),(dest),(len)) 67 #define MEMZERO(dest,len) bzero((dest),(len)) 68 69 /* Hide the calls to the primitive encryption routines. */ 70 #define FASTWAY 71 #ifdef FASTWAY 72 #define DES_KEY(buf) des_setkey(buf) 73 #define DES_XFORM(buf) des_cipher(buf, buf, 0L, (inverse ? -1 : 1)) 74 #else 75 #define DES_KEY(buf) { \ 76 char bits1[64]; /* bits of key */ \ 77 expand(buf, bits1); \ 78 setkey(bits1); \ 79 } 80 #define DES_XFORM(buf) { \ 81 char bits1[64]; /* bits of message */ \ 82 expand(buf, bits1); \ 83 encrypt(bits1, inverse); \ 84 compress(bits1, buf); \ 85 } 86 #endif 87 88 /* 89 * this does an error-checking write 90 */ 91 #define READ(buf, n) fread(buf, sizeof(char), n, stdin) 92 #define WRITE(buf,n) \ 93 if (fwrite(buf, sizeof(char), n, stdout) != n) \ 94 err(bn, NULL); 95 96 /* 97 * some things to make references easier 98 */ 99 typedef char Desbuf[8]; 100 #define CHAR(x,i) (x[i]) 101 #define UCHAR(x,i) (x[i]) 102 #define BUFFER(x) (x) 103 #define UBUFFER(x) (x) 104 105 /* 106 * global variables and related macros 107 */ 108 #define KEY_DEFAULT 0 /* interpret radix of key from key */ 109 #define KEY_ASCII 1 /* key is in ASCII characters */ 110 int keybase = KEY_DEFAULT; /* how to interpret the key */ 111 112 enum { /* encrypt, decrypt, authenticate */ 113 MODE_ENCRYPT, MODE_DECRYPT, MODE_AUTHENTICATE 114 } mode = MODE_ENCRYPT; 115 enum { /* ecb, cbc, cfb, cfba, ofb? */ 116 ALG_ECB, ALG_CBC, ALG_CFB, ALG_OFB, ALG_CFBA 117 } alg = ALG_CBC; 118 119 Desbuf ivec; /* initialization vector */ 120 char bits[] = { /* used to extract bits from a char */ 121 '\200', '\100', '\040', '\020', '\010', '\004', '\002', '\001' 122 }; 123 int inverse; /* 0 to encrypt, 1 to decrypt */ 124 int macbits = -1; /* number of bits in authentication */ 125 int fbbits = -1; /* number of feedback bits */ 126 int pflag; /* 1 to preserve parity bits */ 127 128 main(ac, av) 129 int ac; /* arg count */ 130 char **av; /* arg vector */ 131 { 132 extern int optind; /* option (argument) number */ 133 extern char *optarg; /* argument to option if any */ 134 register int i; /* counter in a for loop */ 135 register char *p; /* used to obtain the key */ 136 Desbuf msgbuf; /* I/O buffer */ 137 int kflag; /* command-line encryptiooon key */ 138 int argc; /* the real arg count */ 139 char **argv; /* the real argument vector */ 140 141 /* 142 * Hide the arguments from ps(1) by making private copies of them 143 * and clobbering the global (visible to ps(1)) ones. 144 */ 145 argc = ac; 146 ac = 1; 147 argv = malloc((argc + 1) * sizeof(char *)); 148 for (i = 0; i < argc; ++i) { 149 argv[i] = strdup(av[i]); 150 MEMZERO(av[i], strlen(av[i])); 151 } 152 argv[argc] = NULL; 153 154 /* initialize the initialization vctor */ 155 MEMZERO(ivec, 8); 156 157 /* process the argument list */ 158 kflag = 0; 159 while ((i = getopt(argc, argv, "abdF:f:k:m:o:pv:")) != EOF) 160 switch(i) { 161 case 'a': /* key is ASCII */ 162 keybase = KEY_ASCII; 163 break; 164 case 'b': /* use ECB mode */ 165 alg = ALG_ECB; 166 break; 167 case 'd': /* decrypt */ 168 mode = MODE_DECRYPT; 169 break; 170 case 'F': /* use alternative CFB mode */ 171 alg = ALG_CFBA; 172 if ((fbbits = setbits(optarg, 7)) > 56 || fbbits == 0) 173 err(-1, "-F: number must be 1-56 inclusive"); 174 else if (fbbits == -1) 175 err(-1, "-F: number must be a multiple of 7"); 176 break; 177 case 'f': /* use CFB mode */ 178 alg = ALG_CFB; 179 if ((fbbits = setbits(optarg, 8)) > 64 || fbbits == 0) 180 err(-1, "-f: number must be 1-64 inclusive"); 181 else if (fbbits == -1) 182 err(-1, "-f: number must be a multiple of 8"); 183 break; 184 case 'k': /* encryption key */ 185 kflag = 1; 186 cvtkey(BUFFER(msgbuf), optarg); 187 break; 188 case 'm': /* number of bits for MACing */ 189 mode = MODE_AUTHENTICATE; 190 if ((macbits = setbits(optarg, 1)) > 64) 191 err(-1, "-m: number must be 0-64 inclusive"); 192 break; 193 case 'o': /* use OFB mode */ 194 alg = ALG_OFB; 195 if ((fbbits = setbits(optarg, 8)) > 64 || fbbits == 0) 196 err(-1, "-o: number must be 1-64 inclusive"); 197 else if (fbbits == -1) 198 err(-1, "-o: number must be a multiple of 8"); 199 break; 200 case 'p': /* preserve parity bits */ 201 pflag = 1; 202 break; 203 case 'v': /* set initialization vector */ 204 cvtkey(BUFFER(ivec), optarg); 205 break; 206 default: /* error */ 207 usage(); 208 } 209 210 if (!kflag) { 211 /* 212 * if the key's not ASCII, assume it is 213 */ 214 keybase = KEY_ASCII; 215 /* 216 * get the key 217 */ 218 p = getpass("Enter key: "); 219 /* 220 * copy it, nul-padded, into the key area 221 */ 222 cvtkey(BUFFER(msgbuf), p); 223 } 224 225 makekey(msgbuf); 226 inverse = (alg == ALG_CBC || alg == ALG_ECB) && mode == MODE_DECRYPT; 227 228 switch(alg) { 229 case ALG_CBC: 230 switch(mode) { 231 case MODE_AUTHENTICATE: /* authenticate using CBC mode */ 232 cbcauth(); 233 break; 234 case MODE_DECRYPT: /* decrypt using CBC mode */ 235 cbcdec(); 236 break; 237 case MODE_ENCRYPT: /* encrypt using CBC mode */ 238 cbcenc(); 239 break; 240 } 241 break; 242 case ALG_CFB: 243 switch(mode) { 244 case MODE_AUTHENTICATE: /* authenticate using CFB mode */ 245 cfbauth(); 246 break; 247 case MODE_DECRYPT: /* decrypt using CFB mode */ 248 cfbdec(); 249 break; 250 case MODE_ENCRYPT: /* encrypt using CFB mode */ 251 cfbenc(); 252 break; 253 } 254 break; 255 case ALG_CFBA: 256 switch(mode) { 257 case MODE_AUTHENTICATE: /* authenticate using CFBA mode */ 258 err(-1, "can't authenticate with CFBA mode"); 259 break; 260 case MODE_DECRYPT: /* decrypt using CFBA mode */ 261 cfbadec(); 262 break; 263 case MODE_ENCRYPT: /* encrypt using CFBA mode */ 264 cfbaenc(); 265 break; 266 } 267 break; 268 case ALG_ECB: 269 switch(mode) { 270 case MODE_AUTHENTICATE: /* authenticate using ECB mode */ 271 err(-1, "can't authenticate with ECB mode"); 272 break; 273 case MODE_DECRYPT: /* decrypt using ECB mode */ 274 ecbdec(); 275 break; 276 case MODE_ENCRYPT: /* encrypt using ECB mode */ 277 ecbenc(); 278 break; 279 } 280 break; 281 case ALG_OFB: 282 switch(mode) { 283 case MODE_AUTHENTICATE: /* authenticate using OFB mode */ 284 err(-1, "can't authenticate with OFB mode"); 285 break; 286 case MODE_DECRYPT: /* decrypt using OFB mode */ 287 ofbdec(); 288 break; 289 case MODE_ENCRYPT: /* encrypt using OFB mode */ 290 ofbenc(); 291 break; 292 } 293 break; 294 } 295 exit(0); 296 } 297 298 /* 299 * print a warning message and, possibly, terminate 300 */ 301 err(n, s) 302 int n; /* offending block number */ 303 char *s; /* the message */ 304 { 305 if (n > 0) 306 (void)fprintf(stderr, "bdes (block %d): ", n); 307 else 308 (void)fprintf(stderr, "bdes: "); 309 (void)fprintf(stderr, "%s\n", s ? s : strerror(errno)); 310 exit(1); 311 } 312 313 /* 314 * map a hex character to an integer 315 */ 316 tobinhex(c, radix) 317 char c; /* char to be converted */ 318 int radix; /* base (2 to 16) */ 319 { 320 switch(c) { 321 case '0': return(0x0); 322 case '1': return(0x1); 323 case '2': return(radix > 2 ? 0x2 : -1); 324 case '3': return(radix > 3 ? 0x3 : -1); 325 case '4': return(radix > 4 ? 0x4 : -1); 326 case '5': return(radix > 5 ? 0x5 : -1); 327 case '6': return(radix > 6 ? 0x6 : -1); 328 case '7': return(radix > 7 ? 0x7 : -1); 329 case '8': return(radix > 8 ? 0x8 : -1); 330 case '9': return(radix > 9 ? 0x9 : -1); 331 case 'A': case 'a': return(radix > 10 ? 0xa : -1); 332 case 'B': case 'b': return(radix > 11 ? 0xb : -1); 333 case 'C': case 'c': return(radix > 12 ? 0xc : -1); 334 case 'D': case 'd': return(radix > 13 ? 0xd : -1); 335 case 'E': case 'e': return(radix > 14 ? 0xe : -1); 336 case 'F': case 'f': return(radix > 15 ? 0xf : -1); 337 } 338 /* 339 * invalid character 340 */ 341 return(-1); 342 } 343 344 /* 345 * convert the key to a bit pattern 346 */ 347 cvtkey(obuf, ibuf) 348 char *obuf; /* bit pattern */ 349 char *ibuf; /* the key itself */ 350 { 351 register int i, j; /* counter in a for loop */ 352 int nbuf[64]; /* used for hex/key translation */ 353 354 /* 355 * just switch on the key base 356 */ 357 switch(keybase) { 358 case KEY_ASCII: /* ascii to integer */ 359 (void)strncpy(obuf, ibuf, 8); 360 return; 361 case KEY_DEFAULT: /* tell from context */ 362 /* 363 * leading '0x' or '0X' == hex key 364 */ 365 if (ibuf[0] == '0' && (ibuf[1] == 'x' || ibuf[1] == 'X')) { 366 ibuf = &ibuf[2]; 367 /* 368 * now translate it, bombing on any illegal hex digit 369 */ 370 for (i = 0; ibuf[i] && i < 16; i++) 371 if ((nbuf[i] = tobinhex(ibuf[i], 16)) == -1) 372 err(-1, "bad hex digit in key"); 373 while (i < 16) 374 nbuf[i++] = 0; 375 for (i = 0; i < 8; i++) 376 obuf[i] = 377 ((nbuf[2*i]&0xf)<<4) | (nbuf[2*i+1]&0xf); 378 /* preserve parity bits */ 379 pflag = 1; 380 return; 381 } 382 /* 383 * leading '0b' or '0B' == binary key 384 */ 385 if (ibuf[0] == '0' && (ibuf[1] == 'b' || ibuf[1] == 'B')) { 386 ibuf = &ibuf[2]; 387 /* 388 * now translate it, bombing on any illegal binary digit 389 */ 390 for (i = 0; ibuf[i] && i < 16; i++) 391 if ((nbuf[i] = tobinhex(ibuf[i], 2)) == -1) 392 err(-1, "bad binary digit in key"); 393 while (i < 64) 394 nbuf[i++] = 0; 395 for (i = 0; i < 8; i++) 396 for (j = 0; j < 8; j++) 397 obuf[i] = (obuf[i]<<1)|nbuf[8*i+j]; 398 /* preserve parity bits */ 399 pflag = 1; 400 return; 401 } 402 /* 403 * no special leader -- ASCII 404 */ 405 (void)strncpy(obuf, ibuf, 8); 406 } 407 } 408 409 /* 410 * convert an ASCII string into a decimal number: 411 * 1. must be between 0 and 64 inclusive 412 * 2. must be a valid decimal number 413 * 3. must be a multiple of mult 414 */ 415 setbits(s, mult) 416 char *s; /* the ASCII string */ 417 int mult; /* what it must be a multiple of */ 418 { 419 register char *p; /* pointer in a for loop */ 420 register int n = 0; /* the integer collected */ 421 422 /* 423 * skip white space 424 */ 425 while (isspace(*s)) 426 s++; 427 /* 428 * get the integer 429 */ 430 for (p = s; *p; p++) { 431 if (isdigit(*p)) 432 n = n * 10 + *p - '0'; 433 else { 434 err(-1, "bad decimal digit in MAC length"); 435 } 436 } 437 /* 438 * be sure it's a multiple of mult 439 */ 440 return((n % mult != 0) ? -1 : n); 441 } 442 443 /***************** 444 * DES FUNCTIONS * 445 *****************/ 446 /* 447 * This sets the DES key and (if you're using the deszip version) 448 * the direction of the transformation. This uses the Sun 449 * to map the 64-bit key onto the 56 bits that the key schedule 450 * generation routines use: the old way, which just uses the user- 451 * supplied 64 bits as is, and the new way, which resets the parity 452 * bit to be the same as the low-order bit in each character. The 453 * new way generates a greater variety of key schedules, since many 454 * systems set the parity (high) bit of each character to 0, and the 455 * DES ignores the low order bit of each character. 456 */ 457 makekey(buf) 458 Desbuf buf; /* key block */ 459 { 460 register int i, j; /* counter in a for loop */ 461 register int par; /* parity counter */ 462 463 /* 464 * if the parity is not preserved, flip it 465 */ 466 if (!pflag) { 467 for (i = 0; i < 8; i++) { 468 par = 0; 469 for (j = 1; j < 8; j++) 470 if ((bits[j]&UCHAR(buf, i)) != 0) 471 par++; 472 if ((par&01) == 01) 473 UCHAR(buf, i) = UCHAR(buf, i)&0177; 474 else 475 UCHAR(buf, i) = (UCHAR(buf, i)&0177)|0200; 476 } 477 } 478 /* 479 * Make the key schedule. If an error, the system probably does 480 * not have the encryption routines available. 481 */ 482 errno = 0; 483 DES_KEY(UBUFFER(buf)); 484 if (errno) 485 err(0, NULL); 486 } 487 488 /* 489 * This encrypts using the Electronic Code Book mode of DES 490 */ 491 ecbenc() 492 { 493 register int n; /* number of bytes actually read */ 494 register int bn; /* block number */ 495 Desbuf msgbuf; /* I/O buffer */ 496 497 for (bn = 0; (n = READ(BUFFER(msgbuf), 8)) == 8; bn++) { 498 /* 499 * do the transformation 500 */ 501 DES_XFORM(UBUFFER(msgbuf)); 502 WRITE(BUFFER(msgbuf), 8); 503 } 504 /* 505 * at EOF or last block -- in either ase, the last byte contains 506 * the character representation of the number of bytes in it 507 */ 508 bn++; 509 MEMZERO(&CHAR(msgbuf, n), 8 - n); 510 CHAR(msgbuf, 7) = n; 511 DES_XFORM(UBUFFER(msgbuf)); 512 WRITE(BUFFER(msgbuf), 8); 513 514 } 515 516 /* 517 * This decrypts using the Electronic Code Book mode of DES 518 */ 519 ecbdec() 520 { 521 register int n; /* number of bytes actually read */ 522 register int c; /* used to test for EOF */ 523 register int bn; /* block number */ 524 Desbuf msgbuf; /* I/O buffer */ 525 526 for (bn = 1; (n = READ(BUFFER(msgbuf), 8)) == 8; bn++) { 527 /* 528 * do the transformation 529 */ 530 DES_XFORM(UBUFFER(msgbuf)); 531 /* 532 * if the last one, handle it specially 533 */ 534 if ((c = getchar()) == EOF) { 535 n = CHAR(msgbuf, 7); 536 if (n < 0 || n > 7) 537 err(bn, "decryption failed (block corrupted)"); 538 } 539 else 540 (void)ungetc(c, stdin); 541 WRITE(BUFFER(msgbuf), n); 542 } 543 if (n > 0) 544 err(bn, "decryption failed (incomplete block)"); 545 } 546 547 /* 548 * This encrypts using the Cipher Block Chaining mode of DES 549 */ 550 cbcenc() 551 { 552 register int n; /* number of bytes actually read */ 553 register int bn; /* block number */ 554 Desbuf msgbuf; /* I/O buffer */ 555 556 /* 557 * do the transformation 558 */ 559 for (bn = 1; (n = READ(BUFFER(msgbuf), 8)) == 8; bn++) { 560 for (n = 0; n < 8; n++) 561 CHAR(msgbuf, n) ^= CHAR(ivec, n); 562 DES_XFORM(UBUFFER(msgbuf)); 563 MEMCPY(BUFFER(ivec), BUFFER(msgbuf), 8); 564 WRITE(BUFFER(msgbuf), 8); 565 } 566 /* 567 * at EOF or last block -- in either case, the last byte contains 568 * the character representation of the number of bytes in it 569 */ 570 bn++; 571 MEMZERO(&CHAR(msgbuf, n), 8 - n); 572 CHAR(msgbuf, 7) = n; 573 for (n = 0; n < 8; n++) 574 CHAR(msgbuf, n) ^= CHAR(ivec, n); 575 DES_XFORM(UBUFFER(msgbuf)); 576 WRITE(BUFFER(msgbuf), 8); 577 578 } 579 580 /* 581 * This decrypts using the Cipher Block Chaining mode of DES 582 */ 583 cbcdec() 584 { 585 register int n; /* number of bytes actually read */ 586 Desbuf msgbuf; /* I/O buffer */ 587 Desbuf ibuf; /* temp buffer for initialization vector */ 588 register int c; /* used to test for EOF */ 589 register int bn; /* block number */ 590 591 for (bn = 0; (n = READ(BUFFER(msgbuf), 8)) == 8; bn++) { 592 /* 593 * do the transformation 594 */ 595 MEMCPY(BUFFER(ibuf), BUFFER(msgbuf), 8); 596 DES_XFORM(UBUFFER(msgbuf)); 597 for (c = 0; c < 8; c++) 598 UCHAR(msgbuf, c) ^= UCHAR(ivec, c); 599 MEMCPY(BUFFER(ivec), BUFFER(ibuf), 8); 600 /* 601 * if the last one, handle it specially 602 */ 603 if ((c = getchar()) == EOF) { 604 n = CHAR(msgbuf, 7); 605 if (n < 0 || n > 7) 606 err(bn, "decryption failed (block corrupted)"); 607 } 608 else 609 (void)ungetc(c, stdin); 610 WRITE(BUFFER(msgbuf), n); 611 } 612 if (n > 0) 613 err(bn, "decryption failed (incomplete block)"); 614 } 615 616 /* 617 * This authenticates using the Cipher Block Chaining mode of DES 618 */ 619 cbcauth() 620 { 621 register int n, j; /* number of bytes actually read */ 622 Desbuf msgbuf; /* I/O buffer */ 623 Desbuf encbuf; /* encryption buffer */ 624 625 /* 626 * do the transformation 627 * note we DISCARD the encrypted block; 628 * we only care about the last one 629 */ 630 while ((n = READ(BUFFER(msgbuf), 8)) == 8) { 631 for (n = 0; n < 8; n++) 632 CHAR(encbuf, n) = CHAR(msgbuf, n) ^ CHAR(ivec, n); 633 DES_XFORM(UBUFFER(encbuf)); 634 MEMCPY(BUFFER(ivec), BUFFER(encbuf), 8); 635 } 636 /* 637 * now compute the last one, right padding with '\0' if need be 638 */ 639 if (n > 0) { 640 MEMZERO(&CHAR(msgbuf, n), 8 - n); 641 for (n = 0; n < 8; n++) 642 CHAR(encbuf, n) = CHAR(msgbuf, n) ^ CHAR(ivec, n); 643 DES_XFORM(UBUFFER(encbuf)); 644 } 645 /* 646 * drop the bits 647 * we write chars until fewer than 7 bits, 648 * and then pad the last one with 0 bits 649 */ 650 for (n = 0; macbits > 7; n++, macbits -= 8) 651 (void)putchar(CHAR(encbuf, n)); 652 if (macbits > 0) { 653 CHAR(msgbuf, 0) = 0x00; 654 for (j = 0; j < macbits; j++) 655 CHAR(msgbuf, 0) |= (CHAR(encbuf, n)&bits[j]); 656 (void)putchar(CHAR(msgbuf, 0)); 657 } 658 } 659 660 /* 661 * This encrypts using the Cipher FeedBack mode of DES 662 */ 663 cfbenc() 664 { 665 register int n; /* number of bytes actually read */ 666 register int nbytes; /* number of bytes to read */ 667 register int bn; /* block number */ 668 char ibuf[8]; /* input buffer */ 669 Desbuf msgbuf; /* encryption buffer */ 670 671 /* 672 * do things in bytes, not bits 673 */ 674 nbytes = fbbits / 8; 675 /* 676 * do the transformation 677 */ 678 for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) { 679 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); 680 DES_XFORM(UBUFFER(msgbuf)); 681 for (n = 0; n < 8 - nbytes; n++) 682 UCHAR(ivec, n) = UCHAR(ivec, n+nbytes); 683 for (n = 0; n < nbytes; n++) 684 UCHAR(ivec, 8-nbytes+n) = ibuf[n] ^ UCHAR(msgbuf, n); 685 WRITE(&CHAR(ivec, 8-nbytes), nbytes); 686 } 687 /* 688 * at EOF or last block -- in either case, the last byte contains 689 * the character representation of the number of bytes in it 690 */ 691 bn++; 692 MEMZERO(&ibuf[n], nbytes - n); 693 ibuf[nbytes - 1] = n; 694 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); 695 DES_XFORM(UBUFFER(msgbuf)); 696 for (n = 0; n < nbytes; n++) 697 ibuf[n] ^= UCHAR(msgbuf, n); 698 WRITE(ibuf, nbytes); 699 } 700 701 /* 702 * This decrypts using the Cipher Block Chaining mode of DES 703 */ 704 cfbdec() 705 { 706 register int n; /* number of bytes actually read */ 707 register int c; /* used to test for EOF */ 708 register int nbytes; /* number of bytes to read */ 709 register int bn; /* block number */ 710 char ibuf[8]; /* input buffer */ 711 char obuf[8]; /* output buffer */ 712 Desbuf msgbuf; /* encryption buffer */ 713 714 /* 715 * do things in bytes, not bits 716 */ 717 nbytes = fbbits / 8; 718 /* 719 * do the transformation 720 */ 721 for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) { 722 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); 723 DES_XFORM(UBUFFER(msgbuf)); 724 for (c = 0; c < 8 - nbytes; c++) 725 CHAR(ivec, c) = CHAR(ivec, c+nbytes); 726 for (c = 0; c < nbytes; c++) { 727 CHAR(ivec, 8-nbytes+c) = ibuf[c]; 728 obuf[c] = ibuf[c] ^ UCHAR(msgbuf, c); 729 } 730 /* 731 * if the last one, handle it specially 732 */ 733 if ((c = getchar()) == EOF) { 734 n = obuf[nbytes-1]; 735 if (n < 0 || n > nbytes-1) 736 err(bn, "decryption failed (block corrupted)"); 737 } 738 else 739 (void)ungetc(c, stdin); 740 WRITE(obuf, n); 741 } 742 if (n > 0) 743 err(bn, "decryption failed (incomplete block)"); 744 } 745 746 /* 747 * This encrypts using the alternative Cipher FeedBack mode of DES 748 */ 749 cfbaenc() 750 { 751 register int n; /* number of bytes actually read */ 752 register int nbytes; /* number of bytes to read */ 753 register int bn; /* block number */ 754 char ibuf[8]; /* input buffer */ 755 char obuf[8]; /* output buffer */ 756 Desbuf msgbuf; /* encryption buffer */ 757 758 /* 759 * do things in bytes, not bits 760 */ 761 nbytes = fbbits / 7; 762 /* 763 * do the transformation 764 */ 765 for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) { 766 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); 767 DES_XFORM(UBUFFER(msgbuf)); 768 for (n = 0; n < 8 - nbytes; n++) 769 UCHAR(ivec, n) = UCHAR(ivec, n+nbytes); 770 for (n = 0; n < nbytes; n++) 771 UCHAR(ivec, 8-nbytes+n) = (ibuf[n] ^ UCHAR(msgbuf, n)) 772 |0200; 773 for (n = 0; n < nbytes; n++) 774 obuf[n] = CHAR(ivec, 8-nbytes+n)&0177; 775 WRITE(obuf, nbytes); 776 } 777 /* 778 * at EOF or last block -- in either case, the last byte contains 779 * the character representation of the number of bytes in it 780 */ 781 bn++; 782 MEMZERO(&ibuf[n], nbytes - n); 783 ibuf[nbytes - 1] = ('0' + n)|0200; 784 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); 785 DES_XFORM(UBUFFER(msgbuf)); 786 for (n = 0; n < nbytes; n++) 787 ibuf[n] ^= UCHAR(msgbuf, n); 788 WRITE(ibuf, nbytes); 789 } 790 791 /* 792 * This decrypts using the alternative Cipher Block Chaining mode of DES 793 */ 794 cfbadec() 795 { 796 register int n; /* number of bytes actually read */ 797 register int c; /* used to test for EOF */ 798 register int nbytes; /* number of bytes to read */ 799 register int bn; /* block number */ 800 char ibuf[8]; /* input buffer */ 801 char obuf[8]; /* output buffer */ 802 Desbuf msgbuf; /* encryption buffer */ 803 804 /* 805 * do things in bytes, not bits 806 */ 807 nbytes = fbbits / 7; 808 /* 809 * do the transformation 810 */ 811 for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) { 812 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); 813 DES_XFORM(UBUFFER(msgbuf)); 814 for (c = 0; c < 8 - nbytes; c++) 815 CHAR(ivec, c) = CHAR(ivec, c+nbytes); 816 for (c = 0; c < nbytes; c++) { 817 CHAR(ivec, 8-nbytes+c) = ibuf[c]|0200; 818 obuf[c] = (ibuf[c] ^ UCHAR(msgbuf, c))&0177; 819 } 820 /* 821 * if the last one, handle it specially 822 */ 823 if ((c = getchar()) == EOF) { 824 if ((n = (obuf[nbytes-1] - '0')) < 0 825 || n > nbytes-1) 826 err(bn, "decryption failed (block corrupted)"); 827 } 828 else 829 (void)ungetc(c, stdin); 830 WRITE(obuf, n); 831 } 832 if (n > 0) 833 err(bn, "decryption failed (incomplete block)"); 834 } 835 836 837 /* 838 * This encrypts using the Output FeedBack mode of DES 839 */ 840 ofbenc() 841 { 842 register int n; /* number of bytes actually read */ 843 register int c; /* used to test for EOF */ 844 register int nbytes; /* number of bytes to read */ 845 register int bn; /* block number */ 846 char ibuf[8]; /* input buffer */ 847 char obuf[8]; /* output buffer */ 848 Desbuf msgbuf; /* encryption buffer */ 849 850 /* 851 * do things in bytes, not bits 852 */ 853 nbytes = fbbits / 8; 854 /* 855 * do the transformation 856 */ 857 for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) { 858 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); 859 DES_XFORM(UBUFFER(msgbuf)); 860 for (n = 0; n < 8 - nbytes; n++) 861 UCHAR(ivec, n) = UCHAR(ivec, n+nbytes); 862 for (n = 0; n < nbytes; n++) { 863 UCHAR(ivec, 8-nbytes+n) = UCHAR(msgbuf, n); 864 obuf[n] = ibuf[n] ^ UCHAR(msgbuf, n); 865 } 866 WRITE(obuf, nbytes); 867 } 868 /* 869 * at EOF or last block -- in either case, the last byte contains 870 * the character representation of the number of bytes in it 871 */ 872 bn++; 873 MEMZERO(&ibuf[n], nbytes - n); 874 ibuf[nbytes - 1] = n; 875 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); 876 DES_XFORM(UBUFFER(msgbuf)); 877 for (c = 0; c < nbytes; c++) 878 ibuf[c] ^= UCHAR(msgbuf, c); 879 WRITE(ibuf, nbytes); 880 } 881 882 /* 883 * This decrypts using the Output Block Chaining mode of DES 884 */ 885 ofbdec() 886 { 887 register int n; /* number of bytes actually read */ 888 register int c; /* used to test for EOF */ 889 register int nbytes; /* number of bytes to read */ 890 register int bn; /* block number */ 891 char ibuf[8]; /* input buffer */ 892 char obuf[8]; /* output buffer */ 893 Desbuf msgbuf; /* encryption buffer */ 894 895 /* 896 * do things in bytes, not bits 897 */ 898 nbytes = fbbits / 8; 899 /* 900 * do the transformation 901 */ 902 for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) { 903 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); 904 DES_XFORM(UBUFFER(msgbuf)); 905 for (c = 0; c < 8 - nbytes; c++) 906 CHAR(ivec, c) = CHAR(ivec, c+nbytes); 907 for (c = 0; c < nbytes; c++) { 908 CHAR(ivec, 8-nbytes+c) = UCHAR(msgbuf, c); 909 obuf[c] = ibuf[c] ^ UCHAR(msgbuf, c); 910 } 911 /* 912 * if the last one, handle it specially 913 */ 914 if ((c = getchar()) == EOF) { 915 n = obuf[nbytes-1]; 916 if (n < 0 || n > nbytes-1) 917 err(bn, "decryption failed (block corrupted)"); 918 } 919 else 920 (void)ungetc(c, stdin); 921 /* 922 * dump it 923 */ 924 WRITE(obuf, n); 925 } 926 if (n > 0) 927 err(bn, "decryption failed (incomplete block)"); 928 } 929 930 /* 931 * This authenticates using the Cipher FeedBack mode of DES 932 */ 933 cfbauth() 934 { 935 register int n, j; /* number of bytes actually read */ 936 register int nbytes; /* number of bytes to read */ 937 char ibuf[8]; /* input buffer */ 938 Desbuf msgbuf; /* encryption buffer */ 939 940 /* 941 * do things in bytes, not bits 942 */ 943 nbytes = fbbits / 8; 944 /* 945 * do the transformation 946 */ 947 while ((n = READ(ibuf, nbytes)) == nbytes) { 948 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); 949 DES_XFORM(UBUFFER(msgbuf)); 950 for (n = 0; n < 8 - nbytes; n++) 951 UCHAR(ivec, n) = UCHAR(ivec, n+nbytes); 952 for (n = 0; n < nbytes; n++) 953 UCHAR(ivec, 8-nbytes+n) = ibuf[n] ^ UCHAR(msgbuf, n); 954 } 955 /* 956 * at EOF or last block -- in either case, the last byte contains 957 * the character representation of the number of bytes in it 958 */ 959 MEMZERO(&ibuf[n], nbytes - n); 960 ibuf[nbytes - 1] = '0' + n; 961 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); 962 DES_XFORM(UBUFFER(msgbuf)); 963 for (n = 0; n < nbytes; n++) 964 ibuf[n] ^= UCHAR(msgbuf, n); 965 /* 966 * drop the bits 967 * we write chars until fewer than 7 bits, 968 * and then pad the last one with 0 bits 969 */ 970 for (n = 0; macbits > 7; n++, macbits -= 8) 971 (void)putchar(CHAR(msgbuf, n)); 972 if (macbits > 0) { 973 CHAR(msgbuf, 0) = 0x00; 974 for (j = 0; j < macbits; j++) 975 CHAR(msgbuf, 0) |= (CHAR(msgbuf, n)&bits[j]); 976 (void)putchar(CHAR(msgbuf, 0)); 977 } 978 } 979 980 #ifndef FASTWAY 981 /* 982 * change from 8 bits/Uchar to 1 bit/Uchar 983 */ 984 expand(from, to) 985 Desbuf from; /* 8bit/unsigned char string */ 986 char *to; /* 1bit/char string */ 987 { 988 register int i, j; /* counters in for loop */ 989 990 for (i = 0; i < 8; i++) 991 for (j = 0; j < 8; j++) 992 *to++ = (CHAR(from, i)>>(7-j))&01; 993 } 994 995 /* 996 * change from 1 bit/char to 8 bits/Uchar 997 */ 998 compress(from, to) 999 char *from; /* 1bit/char string */ 1000 Desbuf to; /* 8bit/unsigned char string */ 1001 { 1002 register int i, j; /* counters in for loop */ 1003 1004 for (i = 0; i < 8; i++) { 1005 CHAR(to, i) = 0; 1006 for (j = 0; j < 8; j++) 1007 CHAR(to, i) = ((*from++)<<(7-j))|CHAR(to, i); 1008 } 1009 } 1010 #endif 1011 1012 /* 1013 * message about usage 1014 */ 1015 usage() 1016 { 1017 (void)fprintf(stderr, "%s\n", 1018 "usage: bdes [-abdp] [-F bit] [-f bit] [-k key] [-m bit] [-o bit] [-v vector]"); 1019 exit(1); 1020 } 1021