usr.bin/bdes/bdes.c

   1 /*      $NetBSD: bdes.c,v 1.7 2008/07/21 14:19:21 lukem Exp $   */
   2
   3 /*-
   4  * Copyright (c) 1991, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Matt Bishop of Dartmouth College.
   9  *
  10  * The United States Government has rights in this work pursuant
  11  * to contract no. NAG 2-680 between the National Aeronautics and
  12  * Space Administration and Dartmouth College.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  * 3. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #include <sys/cdefs.h>
  40 #ifndef lint
  41 __COPYRIGHT("@(#) Copyright (c) 1991, 1993\
  42  The Regents of the University of California.  All rights reserved.");
  43 #endif /* not lint */
  44
  45 #ifndef lint
  46 #if 0
  47 static char sccsid[] = "@(#)bdes.c      8.1 (Berkeley) 6/6/93";
  48 #else
  49 __RCSID("$NetBSD: bdes.c,v 1.7 2008/07/21 14:19:21 lukem Exp $");
  50 #endif
  51 #endif /* not lint */
  52
  53 /*
  54  * BDES -- DES encryption package for Berkeley Software Distribution 4.4
  55  * options:
  56  *      -a      key is in ASCII
  57  *      -b      use ECB (electronic code book) mode
  58  *      -d      invert (decrypt) input
  59  *      -f b    use b-bit CFB (cipher feedback) mode
  60  *      -F b    use b-bit CFB (cipher feedback) alternative mode
  61  *      -k key  use key as the cryptographic key
  62  *      -m b    generate a MAC of length b
  63  *      -o b    use b-bit OFB (output feedback) mode
  64  *      -p      don't reset the parity bit
  65  *      -v v    use v as the initialization vector (ignored for ECB)
  66  * note: the last character of the last block is the integer indicating
  67  * how many characters of that block are to be output
  68  *
  69  * Author: Matt Bishop
  70  *         Department of Mathematics and Computer Science
  71  *         Dartmouth College
  72  *         Hanover, NH  03755
  73  * Email:  Matt.Bishop@dartmouth.edu
  74  *         ...!decvax!dartvax!Matt.Bishop
  75  *
  76  * See Technical Report PCS-TR91-158, Department of Mathematics and Computer
  77  * Science, Dartmouth College, for a detailed description of the implemen-
  78  * tation and differences between it and Sun's.  The DES is described in
  79  * FIPS PUB 46, and the modes in FIPS PUB 81 (see either the manual page
  80  * or the technical report for a complete reference).
  81  */
  82
  83 #include <errno.h>
  84 #include <unistd.h>
  85 #include <stdio.h>
  86 #include <ctype.h>
  87 #include <stdlib.h>
  88 #include <string.h>
  89
  90 /*
  91  * BSD and System V systems offer special library calls that do
  92  * block moves and fills, so if possible we take advantage of them
  93  */
  94 #define MEMCPY(dest,src,len)    bcopy((src),(dest),(len))
  95 #define MEMZERO(dest,len)       bzero((dest),(len))
  96
  97 /* Hide the calls to the primitive encryption routines. */
  98 #define FASTWAY
  99 #ifdef  FASTWAY
 100 #define DES_KEY(buf) \
 101         if (des_setkey(buf)) \
 102                 bdes_err(0, "des_setkey");
 103 #define DES_XFORM(buf) \
 104         if (des_cipher(buf, buf, 0L, (inverse ? -1 : 1))) \
 105                 bdes_err(0, "des_cipher");
 106 #else
 107 #define DES_KEY(buf)    {                                               \
 108                                 char bits1[64]; /* bits of key */       \
 109                                 expand(buf, bits1);                     \
 110                                 if (setkey(bits1))                      \
 111                                         bdes_err(0, "setkey");          \
 112                         }
 113 #define DES_XFORM(buf)  {                                               \
 114                                 char bits1[64]; /* bits of message */   \
 115                                 expand(buf, bits1);                     \
 116                                 if (encrypt(bits1, inverse))            \
 117                                         bdes_err(0, "encrypt");         \
 118                                 compress(bits1, buf);                   \
 119                         }
 120 #endif
 121
 122 /*
 123  * this does an error-checking write
 124  */
 125 #define READ(buf, n)    fread(buf, sizeof(char), n, stdin)
 126 #define WRITE(buf,n)                                            \
 127                 if (fwrite(buf, sizeof(char), n, stdout) != (size_t)n)  \
 128                         bdes_err(bn, NULL);
 129
 130 /*
 131  * some things to make references easier
 132  */
 133 typedef char Desbuf[8];
 134 #define CHAR(x,i)       (x[i])
 135 #define UCHAR(x,i)      (x[i])
 136 #define BUFFER(x)       (x)
 137 #define UBUFFER(x)      (x)
 138
 139 /*
 140  * global variables and related macros
 141  */
 142 #define KEY_DEFAULT             0       /* interpret radix of key from key */
 143 #define KEY_ASCII               1       /* key is in ASCII characters */
 144 int keybase = KEY_DEFAULT;              /* how to interpret the key */
 145
 146 enum {                                  /* encrypt, decrypt, authenticate */
 147         MODE_ENCRYPT, MODE_DECRYPT, MODE_AUTHENTICATE
 148 } mode = MODE_ENCRYPT;
 149 enum {                                  /* ecb, cbc, cfb, cfba, ofb? */
 150         ALG_ECB, ALG_CBC, ALG_CFB, ALG_OFB, ALG_CFBA
 151 } alg = ALG_CBC;
 152
 153 Desbuf ivec;                            /* initialization vector */
 154 char bits[] = {                         /* used to extract bits from a char */
 155         '\200', '\100', '\040', '\020', '\010', '\004', '\002', '\001'
 156 };
 157 int inverse;                            /* 0 to encrypt, 1 to decrypt */
 158 int macbits = -1;                       /* number of bits in authentication */
 159 int fbbits = -1;                        /* number of feedback bits */
 160 int pflag;                              /* 1 to preserve parity bits */
 161
 162 int     setbits(char *, int);
 163 void    bdes_err(int, const char *);
 164 int     tobinhex(char, int);
 165 void    cvtkey(char *, char *);
 166 void    makekey(Desbuf);
 167 void    ecbenc(void);
 168 void    ecbdec(void);
 169 void    cbcenc(void);
 170 void    cbcdec(void);
 171 void    cbcauth(void);
 172 void    cfbenc(void);
 173 void    cfbdec(void);
 174 void    cfbaenc(void);
 175 void    cfbadec(void);
 176 void    ofbenc(void);
 177 void    ofbdec(void);
 178 void    cfbauth(void);
 179 void    expand(Desbuf, char *);
 180 void    compress(char *, Desbuf);
 181 void    usage(void);
 182
 183 int
 184 main(int ac, char *av[])
 185 {
 186         register int i;                 /* counter in a for loop */
 187         register char *p;               /* used to obtain the key */
 188         Desbuf msgbuf;                  /* I/O buffer */
 189         int kflag;                      /* command-line encryptiooon key */
 190         int argc;                       /* the real arg count */
 191         char **argv;                    /* the real argument vector */
 192
 193         /*
 194          * Hide the arguments from ps(1) by making private copies of them
 195          * and clobbering the global (visible to ps(1)) ones.
 196          */
 197         argc = ac;
 198         ac = 1;
 199         argv = malloc((argc + 1) * sizeof(char *));
 200         for (i = 0; i < argc; ++i) {
 201                 argv[i] = strdup(av[i]);
 202                 MEMZERO(av[i], strlen(av[i]));
 203         }
 204         argv[argc] = NULL;
 205
 206         /* initialize the initialization vctor */
 207         MEMZERO(ivec, 8);
 208
 209         /* process the argument list */
 210         kflag = 0;
 211         while ((i = getopt(argc, argv, "abdF:f:k:m:o:pv:")) != -1)
 212                 switch(i) {
 213                 case 'a':               /* key is ASCII */
 214                         keybase = KEY_ASCII;
 215                         break;
 216                 case 'b':               /* use ECB mode */
 217                         alg = ALG_ECB;
 218                         break;
 219                 case 'd':               /* decrypt */
 220                         mode = MODE_DECRYPT;
 221                         break;
 222                 case 'F':               /* use alternative CFB mode */
 223                         alg = ALG_CFBA;
 224                         if ((fbbits = setbits(optarg, 7)) > 56 || fbbits == 0)
 225                                 bdes_err(-1,
 226                                     "-F: number must be 1-56 inclusive");
 227                         else if (fbbits == -1)
 228                                 bdes_err(-1,
 229                                     "-F: number must be a multiple of 7");
 230                         break;
 231                 case 'f':               /* use CFB mode */
 232                         alg = ALG_CFB;
 233                         if ((fbbits = setbits(optarg, 8)) > 64 || fbbits == 0)
 234                                 bdes_err(-1,
 235                                     "-f: number must be 1-64 inclusive");
 236                         else if (fbbits == -1)
 237                                 bdes_err(-1,
 238                                     "-f: number must be a multiple of 8");
 239                         break;
 240                 case 'k':               /* encryption key */
 241                         kflag = 1;
 242                         cvtkey(BUFFER(msgbuf), optarg);
 243                         break;
 244                 case 'm':               /* number of bits for MACing */
 245                         mode = MODE_AUTHENTICATE;
 246                         if ((macbits = setbits(optarg, 1)) > 64)
 247                                 bdes_err(-1,
 248                                     "-m: number must be 0-64 inclusive");
 249                         break;
 250                 case 'o':               /* use OFB mode */
 251                         alg = ALG_OFB;
 252                         if ((fbbits = setbits(optarg, 8)) > 64 || fbbits == 0)
 253                                 bdes_err(-1,
 254                                     "-o: number must be 1-64 inclusive");
 255                         else if (fbbits == -1)
 256                                 bdes_err(-1,
 257                                     "-o: number must be a multiple of 8");
 258                         break;
 259                 case 'p':               /* preserve parity bits */
 260                         pflag = 1;
 261                         break;
 262                 case 'v':               /* set initialization vector */
 263                         cvtkey(BUFFER(ivec), optarg);
 264                         break;
 265                 default:                /* error */
 266                         usage();
 267                 }
 268
 269         if (!kflag) {
 270                 /*
 271                  * if the key's not ASCII, assume it is
 272                  */
 273                 keybase = KEY_ASCII;
 274                 /*
 275                  * get the key
 276                  */
 277                 p = getpass("Enter key: ");
 278                 /*
 279                  * copy it, nul-padded, into the key area
 280                  */
 281                 cvtkey(BUFFER(msgbuf), p);
 282         }
 283
 284         makekey(msgbuf);
 285         inverse = (alg == ALG_CBC || alg == ALG_ECB) && mode == MODE_DECRYPT;
 286
 287         switch(alg) {
 288         case ALG_CBC:
 289                 switch(mode) {
 290                 case MODE_AUTHENTICATE: /* authenticate using CBC mode */
 291                         cbcauth();
 292                         break;
 293                 case MODE_DECRYPT:      /* decrypt using CBC mode */
 294                         cbcdec();
 295                         break;
 296                 case MODE_ENCRYPT:      /* encrypt using CBC mode */
 297                         cbcenc();
 298                         break;
 299                 }
 300                 break;
 301         case ALG_CFB:
 302                 switch(mode) {
 303                 case MODE_AUTHENTICATE: /* authenticate using CFB mode */
 304                         cfbauth();
 305                         break;
 306                 case MODE_DECRYPT:      /* decrypt using CFB mode */
 307                         cfbdec();
 308                         break;
 309                 case MODE_ENCRYPT:      /* encrypt using CFB mode */
 310                         cfbenc();
 311                         break;
 312                 }
 313                 break;
 314         case ALG_CFBA:
 315                 switch(mode) {
 316                 case MODE_AUTHENTICATE: /* authenticate using CFBA mode */
 317                         bdes_err(-1, "can't authenticate with CFBA mode");
 318                         break;
 319                 case MODE_DECRYPT:      /* decrypt using CFBA mode */
 320                         cfbadec();
 321                         break;
 322                 case MODE_ENCRYPT:      /* encrypt using CFBA mode */
 323                         cfbaenc();
 324                         break;
 325                 }
 326                 break;
 327         case ALG_ECB:
 328                 switch(mode) {
 329                 case MODE_AUTHENTICATE: /* authenticate using ECB mode */
 330                         bdes_err(-1, "can't authenticate with ECB mode");
 331                         break;
 332                 case MODE_DECRYPT:      /* decrypt using ECB mode */
 333                         ecbdec();
 334                         break;
 335                 case MODE_ENCRYPT:      /* encrypt using ECB mode */
 336                         ecbenc();
 337                         break;
 338                 }
 339                 break;
 340         case ALG_OFB:
 341                 switch(mode) {
 342                 case MODE_AUTHENTICATE: /* authenticate using OFB mode */
 343                         bdes_err(-1, "can't authenticate with OFB mode");
 344                         break;
 345                 case MODE_DECRYPT:      /* decrypt using OFB mode */
 346                         ofbdec();
 347                         break;
 348                 case MODE_ENCRYPT:      /* encrypt using OFB mode */
 349                         ofbenc();
 350                         break;
 351                 }
 352                 break;
 353         }
 354         exit(0);
 355 }
 356
 357 /*
 358  * print a warning message and, possibly, terminate
 359  */
 360 void
 361 bdes_err(int n, const char *s)
 362 {
 363         if (n > 0)
 364                 (void)fprintf(stderr, "bdes (block %d): ", n);
 365         else
 366                 (void)fprintf(stderr, "bdes: ");
 367         (void)fprintf(stderr, "%s\n", s ? s : strerror(errno));
 368         exit(1);
 369 }
 370
 371 /*
 372  * map a hex character to an integer
 373  */
 374 int
 375 tobinhex(char c, int radix)
 376 {
 377         switch(c) {
 378         case '0':               return(0x0);
 379         case '1':               return(0x1);
 380         case '2':               return(radix > 2 ? 0x2 : -1);
 381         case '3':               return(radix > 3 ? 0x3 : -1);
 382         case '4':               return(radix > 4 ? 0x4 : -1);
 383         case '5':               return(radix > 5 ? 0x5 : -1);
 384         case '6':               return(radix > 6 ? 0x6 : -1);
 385         case '7':               return(radix > 7 ? 0x7 : -1);
 386         case '8':               return(radix > 8 ? 0x8 : -1);
 387         case '9':               return(radix > 9 ? 0x9 : -1);
 388         case 'A': case 'a':     return(radix > 10 ? 0xa : -1);
 389         case 'B': case 'b':     return(radix > 11 ? 0xb : -1);
 390         case 'C': case 'c':     return(radix > 12 ? 0xc : -1);
 391         case 'D': case 'd':     return(radix > 13 ? 0xd : -1);
 392         case 'E': case 'e':     return(radix > 14 ? 0xe : -1);
 393         case 'F': case 'f':     return(radix > 15 ? 0xf : -1);
 394         }
 395         /*
 396          * invalid character
 397          */
 398         return(-1);
 399 }
 400
 401 /*
 402  * convert the key to a bit pattern
 403  */
 404 void
 405 cvtkey(char *obuf, char *ibuf)
 406 {
 407         register int i, j;              /* counter in a for loop */
 408         int nbuf[64];                   /* used for hex/key translation */
 409
 410         /*
 411          * just switch on the key base
 412          */
 413         switch(keybase) {
 414         case KEY_ASCII:                 /* ascii to integer */
 415                 (void)strncpy(obuf, ibuf, 8);
 416                 return;
 417         case KEY_DEFAULT:               /* tell from context */
 418                 /*
 419                  * leading '0x' or '0X' == hex key
 420                  */
 421                 if (ibuf[0] == '0' && (ibuf[1] == 'x' || ibuf[1] == 'X')) {
 422                         ibuf = &ibuf[2];
 423                         /*
 424                          * now translate it, bombing on any illegal hex digit
 425                          */
 426                         for (i = 0; ibuf[i] && i < 16; i++)
 427                                 if ((nbuf[i] = tobinhex(ibuf[i], 16)) == -1)
 428                                         bdes_err(-1, "bad hex digit in key");
 429                         while (i < 16)
 430                                 nbuf[i++] = 0;
 431                         for (i = 0; i < 8; i++)
 432                                 obuf[i] =
 433                                     ((nbuf[2*i]&0xf)<<4) | (nbuf[2*i+1]&0xf);
 434                         /* preserve parity bits */
 435                         pflag = 1;
 436                         return;
 437                 }
 438                 /*
 439                  * leading '0b' or '0B' == binary key
 440                  */
 441                 if (ibuf[0] == '0' && (ibuf[1] == 'b' || ibuf[1] == 'B')) {
 442                         ibuf = &ibuf[2];
 443                         /*
 444                          * now translate it, bombing on any illegal binary digit
 445                          */
 446                         for (i = 0; ibuf[i] && i < 16; i++)
 447                                 if ((nbuf[i] = tobinhex(ibuf[i], 2)) == -1)
 448                                         bdes_err(-1, "bad binary digit in key");
 449                         while (i < 64)
 450                                 nbuf[i++] = 0;
 451                         for (i = 0; i < 8; i++)
 452                                 for (j = 0; j < 8; j++)
 453                                         obuf[i] = (obuf[i]<<1)|nbuf[8*i+j];
 454                         /* preserve parity bits */
 455                         pflag = 1;
 456                         return;
 457                 }
 458                 /*
 459                  * no special leader -- ASCII
 460                  */
 461                 (void)strncpy(obuf, ibuf, 8);
 462         }
 463 }
 464
 465 /*
 466  * convert an ASCII string into a decimal number:
 467  * 1. must be between 0 and 64 inclusive (or 56, checked by caller)
 468  * 2. must be a valid decimal number
 469  * 3. must be a multiple of mult
 470  */
 471 int
 472 setbits(char *s, int mult)
 473 {
 474         char *p;
 475         int n;          /* the integer collected */
 476
 477         n = strtoul(s, &p, 10);
 478         if (*p != 0)
 479                 bdes_err(-1, "bad decimal digit in MAC length");
 480         /*
 481          * be sure it's a multiple of mult
 482          */
 483         return((n % mult != 0) ? -1 : n);
 484 }
 485
 486 /*****************
 487  * DES FUNCTIONS *
 488  *****************/
 489 /*
 490  * This sets the DES key and (if you're using the deszip version)
 491  * the direction of the transformation.  This uses the Sun
 492  * to map the 64-bit key onto the 56 bits that the key schedule
 493  * generation routines use: the old way, which just uses the user-
 494  * supplied 64 bits as is, and the new way, which resets the parity
 495  * bit to be the same as the low-order bit in each character.  The
 496  * new way generates a greater variety of key schedules, since many
 497  * systems set the parity (high) bit of each character to 0, and the
 498  * DES ignores the low order bit of each character.
 499  */
 500 void
 501 makekey(Desbuf buf)
 502 {
 503         register int i, j;                      /* counter in a for loop */
 504         register int par;                       /* parity counter */
 505
 506         /*
 507          * if the parity is not preserved, flip it
 508          */
 509         if (!pflag) {
 510                 for (i = 0; i < 8; i++) {
 511                         par = 0;
 512                         for (j = 1; j < 8; j++)
 513                                 if ((bits[j]&UCHAR(buf, i)) != 0)
 514                                         par++;
 515                         if ((par&01) == 01)
 516                                 UCHAR(buf, i) = UCHAR(buf, i)&0177;
 517                         else
 518                                 UCHAR(buf, i) = (UCHAR(buf, i)&0177)|0200;
 519                 }
 520         }
 521
 522         DES_KEY(UBUFFER(buf));
 523 }
 524
 525 /*
 526  * This encrypts using the Electronic Code Book mode of DES
 527  */
 528 void
 529 ecbenc(void)
 530 {
 531         register int n;         /* number of bytes actually read */
 532         register int bn;        /* block number */
 533         Desbuf msgbuf;          /* I/O buffer */
 534
 535         for (bn = 0; (n = READ(BUFFER(msgbuf),  8)) == 8; bn++) {
 536                 /*
 537                  * do the transformation
 538                  */
 539                 DES_XFORM(UBUFFER(msgbuf));
 540                 WRITE(BUFFER(msgbuf), 8);
 541         }
 542         /*
 543          * at EOF or last block -- in either ase, the last byte contains
 544          * the character representation of the number of bytes in it
 545          */
 546         bn++;
 547         MEMZERO(&CHAR(msgbuf, n), 8 - n);
 548         CHAR(msgbuf, 7) = n;
 549         DES_XFORM(UBUFFER(msgbuf));
 550         WRITE(BUFFER(msgbuf), 8);
 551
 552 }
 553
 554 /*
 555  * This decrypts using the Electronic Code Book mode of DES
 556  */
 557 void
 558 ecbdec(void)
 559 {
 560         register int n;         /* number of bytes actually read */
 561         register int c;         /* used to test for EOF */
 562         register int bn;        /* block number */
 563         Desbuf msgbuf;          /* I/O buffer */
 564
 565         for (bn = 1; (n = READ(BUFFER(msgbuf), 8)) == 8; bn++) {
 566                 /*
 567                  * do the transformation
 568                  */
 569                 DES_XFORM(UBUFFER(msgbuf));
 570                 /*
 571                  * if the last one, handle it specially
 572                  */
 573                 if ((c = getchar()) == EOF) {
 574                         n = CHAR(msgbuf, 7);
 575                         if (n < 0 || n > 7)
 576                                 bdes_err(bn,
 577                                     "decryption failed (block corrupted)");
 578                 }
 579                 else
 580                         (void)ungetc(c, stdin);
 581                 WRITE(BUFFER(msgbuf), n);
 582         }
 583         if (n > 0)
 584                 bdes_err(bn, "decryption failed (incomplete block)");
 585 }
 586
 587 /*
 588  * This encrypts using the Cipher Block Chaining mode of DES
 589  */
 590 void
 591 cbcenc(void)
 592 {
 593         register int n;         /* number of bytes actually read */
 594         register int bn;        /* block number */
 595         Desbuf msgbuf;          /* I/O buffer */
 596
 597         /*
 598          * do the transformation
 599          */
 600         for (bn = 1; (n = READ(BUFFER(msgbuf), 8)) == 8; bn++) {
 601                 for (n = 0; n < 8; n++)
 602                         CHAR(msgbuf, n) ^= CHAR(ivec, n);
 603                 DES_XFORM(UBUFFER(msgbuf));
 604                 MEMCPY(BUFFER(ivec), BUFFER(msgbuf), 8);
 605                 WRITE(BUFFER(msgbuf), 8);
 606         }
 607         /*
 608          * at EOF or last block -- in either case, the last byte contains
 609          * the character representation of the number of bytes in it
 610          */
 611         bn++;
 612         MEMZERO(&CHAR(msgbuf, n), 8 - n);
 613         CHAR(msgbuf, 7) = n;
 614         for (n = 0; n < 8; n++)
 615                 CHAR(msgbuf, n) ^= CHAR(ivec, n);
 616         DES_XFORM(UBUFFER(msgbuf));
 617         WRITE(BUFFER(msgbuf), 8);
 618
 619 }
 620
 621 /*
 622  * This decrypts using the Cipher Block Chaining mode of DES
 623  */
 624 void
 625 cbcdec(void)
 626 {
 627         register int n;         /* number of bytes actually read */
 628         Desbuf msgbuf;          /* I/O buffer */
 629         Desbuf ibuf;            /* temp buffer for initialization vector */
 630         register int c;         /* used to test for EOF */
 631         register int bn;        /* block number */
 632
 633         for (bn = 0; (n = READ(BUFFER(msgbuf), 8)) == 8; bn++) {
 634                 /*
 635                  * do the transformation
 636                  */
 637                 MEMCPY(BUFFER(ibuf), BUFFER(msgbuf), 8);
 638                 DES_XFORM(UBUFFER(msgbuf));
 639                 for (c = 0; c < 8; c++)
 640                         UCHAR(msgbuf, c) ^= UCHAR(ivec, c);
 641                 MEMCPY(BUFFER(ivec), BUFFER(ibuf), 8);
 642                 /*
 643                  * if the last one, handle it specially
 644                  */
 645                 if ((c = getchar()) == EOF) {
 646                         n = CHAR(msgbuf, 7);
 647                         if (n < 0 || n > 7)
 648                                 bdes_err(bn,
 649                                     "decryption failed (block corrupted)");
 650                 }
 651                 else
 652                         (void)ungetc(c, stdin);
 653                 WRITE(BUFFER(msgbuf), n);
 654         }
 655         if (n > 0)
 656                 bdes_err(bn, "decryption failed (incomplete block)");
 657 }
 658
 659 /*
 660  * This authenticates using the Cipher Block Chaining mode of DES
 661  */
 662 void
 663 cbcauth(void)
 664 {
 665         register int n, j;              /* number of bytes actually read */
 666         Desbuf msgbuf;          /* I/O buffer */
 667         Desbuf encbuf;          /* encryption buffer */
 668
 669         /*
 670          * do the transformation
 671          * note we DISCARD the encrypted block;
 672          * we only care about the last one
 673          */
 674         while ((n = READ(BUFFER(msgbuf), 8)) == 8) {
 675                 for (n = 0; n < 8; n++)
 676                         CHAR(encbuf, n) = CHAR(msgbuf, n) ^ CHAR(ivec, n);
 677                 DES_XFORM(UBUFFER(encbuf));
 678                 MEMCPY(BUFFER(ivec), BUFFER(encbuf), 8);
 679         }
 680         /*
 681          * now compute the last one, right padding with '\0' if need be
 682          */
 683         if (n > 0) {
 684                 MEMZERO(&CHAR(msgbuf, n), 8 - n);
 685                 for (n = 0; n < 8; n++)
 686                         CHAR(encbuf, n) = CHAR(msgbuf, n) ^ CHAR(ivec, n);
 687                 DES_XFORM(UBUFFER(encbuf));
 688         }
 689         /*
 690          * drop the bits
 691          * we write chars until fewer than 7 bits,
 692          * and then pad the last one with 0 bits
 693          */
 694         for (n = 0; macbits > 7; n++, macbits -= 8)
 695                 (void)putchar(CHAR(encbuf, n));
 696         if (macbits > 0) {
 697                 CHAR(msgbuf, 0) = 0x00;
 698                 for (j = 0; j < macbits; j++)
 699                         CHAR(msgbuf, 0) |= (CHAR(encbuf, n)&bits[j]);
 700                 (void)putchar(CHAR(msgbuf, 0));
 701         }
 702 }
 703
 704 /*
 705  * This encrypts using the Cipher FeedBack mode of DES
 706  */
 707 void
 708 cfbenc(void)
 709 {
 710         register int n;         /* number of bytes actually read */
 711         register int nbytes;    /* number of bytes to read */
 712         register int bn;        /* block number */
 713         char ibuf[8];           /* input buffer */
 714         Desbuf msgbuf;          /* encryption buffer */
 715
 716         /*
 717          * do things in bytes, not bits
 718          */
 719         nbytes = fbbits / 8;
 720         /*
 721          * do the transformation
 722          */
 723         for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) {
 724                 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
 725                 DES_XFORM(UBUFFER(msgbuf));
 726                 for (n = 0; n < 8 - nbytes; n++)
 727                         UCHAR(ivec, n) = UCHAR(ivec, n+nbytes);
 728                 for (n = 0; n < nbytes; n++)
 729                         UCHAR(ivec, 8-nbytes+n) = ibuf[n] ^ UCHAR(msgbuf, n);
 730                 WRITE(&CHAR(ivec, 8-nbytes), nbytes);
 731         }
 732         /*
 733          * at EOF or last block -- in either case, the last byte contains
 734          * the character representation of the number of bytes in it
 735          */
 736         bn++;
 737         MEMZERO(&ibuf[n], nbytes - n);
 738         ibuf[nbytes - 1] = n;
 739         MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
 740         DES_XFORM(UBUFFER(msgbuf));
 741         for (n = 0; n < nbytes; n++)
 742                 ibuf[n] ^= UCHAR(msgbuf, n);
 743         WRITE(ibuf, nbytes);
 744 }
 745
 746 /*
 747  * This decrypts using the Cipher Block Chaining mode of DES
 748  */
 749 void
 750 cfbdec(void)
 751 {
 752         register int n;         /* number of bytes actually read */
 753         register int c;         /* used to test for EOF */
 754         register int nbytes;    /* number of bytes to read */
 755         register int bn;        /* block number */
 756         char ibuf[8];           /* input buffer */
 757         char obuf[8];           /* output buffer */
 758         Desbuf msgbuf;          /* encryption buffer */
 759
 760         /*
 761          * do things in bytes, not bits
 762          */
 763         nbytes = fbbits / 8;
 764         /*
 765          * do the transformation
 766          */
 767         for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) {
 768                 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
 769                 DES_XFORM(UBUFFER(msgbuf));
 770                 for (c = 0; c < 8 - nbytes; c++)
 771                         CHAR(ivec, c) = CHAR(ivec, c+nbytes);
 772                 for (c = 0; c < nbytes; c++) {
 773                         CHAR(ivec, 8-nbytes+c) = ibuf[c];
 774                         obuf[c] = ibuf[c] ^ UCHAR(msgbuf, c);
 775                 }
 776                 /*
 777                  * if the last one, handle it specially
 778                  */
 779                 if ((c = getchar()) == EOF) {
 780                         n = obuf[nbytes-1];
 781                         if (n < 0 || n > nbytes-1)
 782                                 bdes_err(bn,
 783                                     "decryption failed (block corrupted)");
 784                 }
 785                 else
 786                         (void)ungetc(c, stdin);
 787                 WRITE(obuf, n);
 788         }
 789         if (n > 0)
 790                 bdes_err(bn, "decryption failed (incomplete block)");
 791 }
 792
 793 /*
 794  * This encrypts using the alternative Cipher FeedBack mode of DES
 795  */
 796 void
 797 cfbaenc(void)
 798 {
 799         register int n;         /* number of bytes actually read */
 800         register int nbytes;    /* number of bytes to read */
 801         register int bn;        /* block number */
 802         char ibuf[8];           /* input buffer */
 803         char obuf[8];           /* output buffer */
 804         Desbuf msgbuf;          /* encryption buffer */
 805
 806         /*
 807          * do things in bytes, not bits
 808          */
 809         nbytes = fbbits / 7;
 810         /*
 811          * do the transformation
 812          */
 813         for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) {
 814                 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
 815                 DES_XFORM(UBUFFER(msgbuf));
 816                 for (n = 0; n < 8 - nbytes; n++)
 817                         UCHAR(ivec, n) = UCHAR(ivec, n+nbytes);
 818                 for (n = 0; n < nbytes; n++)
 819                         UCHAR(ivec, 8-nbytes+n) = (ibuf[n] ^ UCHAR(msgbuf, n))
 820                                                         |0200;
 821                 for (n = 0; n < nbytes; n++)
 822                         obuf[n] = CHAR(ivec, 8-nbytes+n)&0177;
 823                 WRITE(obuf, nbytes);
 824         }
 825         /*
 826          * at EOF or last block -- in either case, the last byte contains
 827          * the character representation of the number of bytes in it
 828          */
 829         bn++;
 830         MEMZERO(&ibuf[n], nbytes - n);
 831         ibuf[nbytes - 1] = ('0' + n)|0200;
 832         MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
 833         DES_XFORM(UBUFFER(msgbuf));
 834         for (n = 0; n < nbytes; n++)
 835                 ibuf[n] ^= UCHAR(msgbuf, n);
 836         WRITE(ibuf, nbytes);
 837 }
 838
 839 /*
 840  * This decrypts using the alternative Cipher Block Chaining mode of DES
 841  */
 842 void
 843 cfbadec(void)
 844 {
 845         register int n;         /* number of bytes actually read */
 846         register int c;         /* used to test for EOF */
 847         register int nbytes;    /* number of bytes to read */
 848         register int bn;        /* block number */
 849         char ibuf[8];           /* input buffer */
 850         char obuf[8];           /* output buffer */
 851         Desbuf msgbuf;          /* encryption buffer */
 852
 853         /*
 854          * do things in bytes, not bits
 855          */
 856         nbytes = fbbits / 7;
 857         /*
 858          * do the transformation
 859          */
 860         for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) {
 861                 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
 862                 DES_XFORM(UBUFFER(msgbuf));
 863                 for (c = 0; c < 8 - nbytes; c++)
 864                         CHAR(ivec, c) = CHAR(ivec, c+nbytes);
 865                 for (c = 0; c < nbytes; c++) {
 866                         CHAR(ivec, 8-nbytes+c) = ibuf[c]|0200;
 867                         obuf[c] = (ibuf[c] ^ UCHAR(msgbuf, c))&0177;
 868                 }
 869                 /*
 870                  * if the last one, handle it specially
 871                  */
 872                 if ((c = getchar()) == EOF) {
 873                         if ((n = (obuf[nbytes-1] - '0')) < 0
 874                                                 || n > nbytes-1)
 875                                 bdes_err(bn,
 876                                     "decryption failed (block corrupted)");
 877                 }
 878                 else
 879                         (void)ungetc(c, stdin);
 880                 WRITE(obuf, n);
 881         }
 882         if (n > 0)
 883                 bdes_err(bn, "decryption failed (incomplete block)");
 884 }
 885
 886
 887 /*
 888  * This encrypts using the Output FeedBack mode of DES
 889  */
 890 void
 891 ofbenc(void)
 892 {
 893         register int n;         /* number of bytes actually read */
 894         register int c;         /* used to test for EOF */
 895         register int nbytes;    /* number of bytes to read */
 896         register int bn;        /* block number */
 897         char ibuf[8];           /* input buffer */
 898         char obuf[8];           /* output buffer */
 899         Desbuf msgbuf;          /* encryption buffer */
 900
 901         /*
 902          * do things in bytes, not bits
 903          */
 904         nbytes = fbbits / 8;
 905         /*
 906          * do the transformation
 907          */
 908         for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) {
 909                 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
 910                 DES_XFORM(UBUFFER(msgbuf));
 911                 for (n = 0; n < 8 - nbytes; n++)
 912                         UCHAR(ivec, n) = UCHAR(ivec, n+nbytes);
 913                 for (n = 0; n < nbytes; n++) {
 914                         UCHAR(ivec, 8-nbytes+n) = UCHAR(msgbuf, n);
 915                         obuf[n] = ibuf[n] ^ UCHAR(msgbuf, n);
 916                 }
 917                 WRITE(obuf, nbytes);
 918         }
 919         /*
 920          * at EOF or last block -- in either case, the last byte contains
 921          * the character representation of the number of bytes in it
 922          */
 923         bn++;
 924         MEMZERO(&ibuf[n], nbytes - n);
 925         ibuf[nbytes - 1] = n;
 926         MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
 927         DES_XFORM(UBUFFER(msgbuf));
 928         for (c = 0; c < nbytes; c++)
 929                 ibuf[c] ^= UCHAR(msgbuf, c);
 930         WRITE(ibuf, nbytes);
 931 }
 932
 933 /*
 934  * This decrypts using the Output Block Chaining mode of DES
 935  */
 936 void
 937 ofbdec(void)
 938 {
 939         register int n;         /* number of bytes actually read */
 940         register int c;         /* used to test for EOF */
 941         register int nbytes;    /* number of bytes to read */
 942         register int bn;        /* block number */
 943         char ibuf[8];           /* input buffer */
 944         char obuf[8];           /* output buffer */
 945         Desbuf msgbuf;          /* encryption buffer */
 946
 947         /*
 948          * do things in bytes, not bits
 949          */
 950         nbytes = fbbits / 8;
 951         /*
 952          * do the transformation
 953          */
 954         for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) {
 955                 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
 956                 DES_XFORM(UBUFFER(msgbuf));
 957                 for (c = 0; c < 8 - nbytes; c++)
 958                         CHAR(ivec, c) = CHAR(ivec, c+nbytes);
 959                 for (c = 0; c < nbytes; c++) {
 960                         CHAR(ivec, 8-nbytes+c) = UCHAR(msgbuf, c);
 961                         obuf[c] = ibuf[c] ^ UCHAR(msgbuf, c);
 962                 }
 963                 /*
 964                  * if the last one, handle it specially
 965                  */
 966                 if ((c = getchar()) == EOF) {
 967                         n = obuf[nbytes-1];
 968                         if (n < 0 || n > nbytes-1)
 969                                 bdes_err(bn,
 970                                     "decryption failed (block corrupted)");
 971                 }
 972                 else
 973                         (void)ungetc(c, stdin);
 974                 /*
 975                  * dump it
 976                  */
 977                 WRITE(obuf, n);
 978         }
 979         if (n > 0)
 980                 bdes_err(bn, "decryption failed (incomplete block)");
 981 }
 982
 983 /*
 984  * This authenticates using the Cipher FeedBack mode of DES
 985  */
 986 void
 987 cfbauth(void)
 988 {
 989         register int n, j;      /* number of bytes actually read */
 990         register int nbytes;    /* number of bytes to read */
 991         char ibuf[8];           /* input buffer */
 992         Desbuf msgbuf;          /* encryption buffer */
 993
 994         /*
 995          * do things in bytes, not bits
 996          */
 997         nbytes = fbbits / 8;
 998         /*
 999          * do the transformation
1000          */
1001         while ((n = READ(ibuf, nbytes)) == nbytes) {
1002                 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
1003                 DES_XFORM(UBUFFER(msgbuf));
1004                 for (n = 0; n < 8 - nbytes; n++)
1005                         UCHAR(ivec, n) = UCHAR(ivec, n+nbytes);
1006                 for (n = 0; n < nbytes; n++)
1007                         UCHAR(ivec, 8-nbytes+n) = ibuf[n] ^ UCHAR(msgbuf, n);
1008         }
1009         /*
1010          * at EOF or last block -- in either case, the last byte contains
1011          * the character representation of the number of bytes in it
1012          */
1013         MEMZERO(&ibuf[n], nbytes - n);
1014         ibuf[nbytes - 1] = '0' + n;
1015         MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
1016         DES_XFORM(UBUFFER(msgbuf));
1017         for (n = 0; n < nbytes; n++)
1018                 ibuf[n] ^= UCHAR(msgbuf, n);
1019         /*
1020          * drop the bits
1021          * we write chars until fewer than 7 bits,
1022          * and then pad the last one with 0 bits
1023          */
1024         for (n = 0; macbits > 7; n++, macbits -= 8)
1025                 (void)putchar(CHAR(msgbuf, n));
1026         if (macbits > 0) {
1027                 CHAR(msgbuf, 0) = 0x00;
1028                 for (j = 0; j < macbits; j++)
1029                         CHAR(msgbuf, 0) |= (CHAR(msgbuf, n)&bits[j]);
1030                 (void)putchar(CHAR(msgbuf, 0));
1031         }
1032 }
1033
1034 #ifndef FASTWAY
1035 /*
1036  * change from 8 bits/Uchar to 1 bit/Uchar
1037  */
1038 void
1039 expand(Desbuf from, char *to)
1040 {
1041         register int i, j;              /* counters in for loop */
1042
1043         for (i = 0; i < 8; i++)
1044                 for (j = 0; j < 8; j++)
1045                         *to++ = (CHAR(from, i)>>(7-j))&01;
1046 }
1047
1048 /*
1049  * change from 1 bit/char to 8 bits/Uchar
1050  */
1051 void
1052 compress(char *from, Desbuf to)
1053 {
1054         register int i, j;              /* counters in for loop */
1055
1056         for (i = 0; i < 8; i++) {
1057                 CHAR(to, i) = 0;
1058                 for (j = 0; j < 8; j++)
1059                         CHAR(to, i) = ((*from++)<<(7-j))|CHAR(to, i);
1060         }
1061 }
1062 #endif
1063
1064 /*
1065  * message about usage
1066  */
1067 void
1068 usage(void)
1069 {
1070
1071         (void) fprintf(stderr, "usage: %s %s\n", getprogname(),
1072             "[-abdp] [-F bit] [-f bit] [-k key] [-m bit] [-o bit] [-v vector]");
1073         exit(1);
1074 }