usr.bin/bdes/bdes.c

   1 /*      $NetBSD: bdes.c,v 1.9 2013/08/15 20:48:56 joerg 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 1.9 2013/08/15 20:48:56 joerg 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 static int keybase = KEY_DEFAULT;       /* how to interpret the key */
 145
 146 static enum {                           /* encrypt, decrypt, authenticate */
 147         MODE_ENCRYPT, MODE_DECRYPT, MODE_AUTHENTICATE
 148 } mode = MODE_ENCRYPT;
 149 static enum {                           /* ecb, cbc, cfb, cfba, ofb? */
 150         ALG_ECB, ALG_CBC, ALG_CFB, ALG_OFB, ALG_CFBA
 151 } alg = ALG_CBC;
 152
 153 static Desbuf ivec;                             /* initialization vector */
 154 static const char bits[] = {                            /* used to extract bits from a char */
 155         '\200', '\100', '\040', '\020', '\010', '\004', '\002', '\001'
 156 };
 157 static int inverse;                             /* 0 to encrypt, 1 to decrypt */
 158 static int macbits = -1;                        /* number of bits in authentication */
 159 static int fbbits = -1;                 /* number of feedback bits */
 160 static int pflag;                               /* 1 to preserve parity bits */
 161
 162 static int      setbits(char *, int);
 163 static void     bdes_err(int, const char *) __dead;
 164 static int      tobinhex(char, int);
 165 static void     cvtkey(char *, char *);
 166 static void     makekey(Desbuf);
 167 static void     ecbenc(void);
 168 static void     ecbdec(void);
 169 static void     cbcenc(void);
 170 static void     cbcdec(void);
 171 static void     cbcauth(void);
 172 static void     cfbenc(void);
 173 static void     cfbdec(void);
 174 static void     cfbaenc(void);
 175 static void     cfbadec(void);
 176 static void     ofbenc(void);
 177 static void     ofbdec(void);
 178 static void     cfbauth(void);
 179 #ifndef FASTWAY
 180 static void     expand(Desbuf, char *);
 181 static void     compress(char *, Desbuf);
 182 #endif
 183 static void     usage(void) __dead;
 184
 185 int
 186 main(int ac, char *av[])
 187 {
 188         register int i;                 /* counter in a for loop */
 189         register char *p;               /* used to obtain the key */
 190         Desbuf msgbuf;                  /* I/O buffer */
 191         int kflag;                      /* command-line encryptiooon key */
 192         int argc;                       /* the real arg count */
 193         char **argv;                    /* the real argument vector */
 194
 195         /*
 196          * Hide the arguments from ps(1) by making private copies of them
 197          * and clobbering the global (visible to ps(1)) ones.
 198          */
 199         argc = ac;
 200         ac = 1;
 201         argv = malloc((argc + 1) * sizeof(char *));
 202         for (i = 0; i < argc; ++i) {
 203                 argv[i] = strdup(av[i]);
 204                 MEMZERO(av[i], strlen(av[i]));
 205         }
 206         argv[argc] = NULL;
 207
 208         /* initialize the initialization vctor */
 209         MEMZERO(ivec, 8);
 210
 211         /* process the argument list */
 212         kflag = 0;
 213         while ((i = getopt(argc, argv, "abdF:f:k:m:o:pv:")) != -1)
 214                 switch(i) {
 215                 case 'a':               /* key is ASCII */
 216                         keybase = KEY_ASCII;
 217                         break;
 218                 case 'b':               /* use ECB mode */
 219                         alg = ALG_ECB;
 220                         break;
 221                 case 'd':               /* decrypt */
 222                         mode = MODE_DECRYPT;
 223                         break;
 224                 case 'F':               /* use alternative CFB mode */
 225                         alg = ALG_CFBA;
 226                         if ((fbbits = setbits(optarg, 7)) > 56 || fbbits == 0)
 227                                 bdes_err(-1,
 228                                     "-F: number must be 1-56 inclusive");
 229                         else if (fbbits == -1)
 230                                 bdes_err(-1,
 231                                     "-F: number must be a multiple of 7");
 232                         break;
 233                 case 'f':               /* use CFB mode */
 234                         alg = ALG_CFB;
 235                         if ((fbbits = setbits(optarg, 8)) > 64 || fbbits == 0)
 236                                 bdes_err(-1,
 237                                     "-f: number must be 1-64 inclusive");
 238                         else if (fbbits == -1)
 239                                 bdes_err(-1,
 240                                     "-f: number must be a multiple of 8");
 241                         break;
 242                 case 'k':               /* encryption key */
 243                         kflag = 1;
 244                         cvtkey(BUFFER(msgbuf), optarg);
 245                         break;
 246                 case 'm':               /* number of bits for MACing */
 247                         mode = MODE_AUTHENTICATE;
 248                         if ((macbits = setbits(optarg, 1)) > 64)
 249                                 bdes_err(-1,
 250                                     "-m: number must be 0-64 inclusive");
 251                         break;
 252                 case 'o':               /* use OFB mode */
 253                         alg = ALG_OFB;
 254                         if ((fbbits = setbits(optarg, 8)) > 64 || fbbits == 0)
 255                                 bdes_err(-1,
 256                                     "-o: number must be 1-64 inclusive");
 257                         else if (fbbits == -1)
 258                                 bdes_err(-1,
 259                                     "-o: number must be a multiple of 8");
 260                         break;
 261                 case 'p':               /* preserve parity bits */
 262                         pflag = 1;
 263                         break;
 264                 case 'v':               /* set initialization vector */
 265                         cvtkey(BUFFER(ivec), optarg);
 266                         break;
 267                 default:                /* error */
 268                         usage();
 269                 }
 270
 271         if (!kflag) {
 272                 /*
 273                  * if the key's not ASCII, assume it is
 274                  */
 275                 keybase = KEY_ASCII;
 276                 /*
 277                  * get the key
 278                  */
 279                 p = getpass("Enter key: ");
 280                 /*
 281                  * copy it, nul-padded, into the key area
 282                  */
 283                 cvtkey(BUFFER(msgbuf), p);
 284         }
 285
 286         makekey(msgbuf);
 287         inverse = (alg == ALG_CBC || alg == ALG_ECB) && mode == MODE_DECRYPT;
 288
 289         switch(alg) {
 290         case ALG_CBC:
 291                 switch(mode) {
 292                 case MODE_AUTHENTICATE: /* authenticate using CBC mode */
 293                         cbcauth();
 294                         break;
 295                 case MODE_DECRYPT:      /* decrypt using CBC mode */
 296                         cbcdec();
 297                         break;
 298                 case MODE_ENCRYPT:      /* encrypt using CBC mode */
 299                         cbcenc();
 300                         break;
 301                 }
 302                 break;
 303         case ALG_CFB:
 304                 switch(mode) {
 305                 case MODE_AUTHENTICATE: /* authenticate using CFB mode */
 306                         cfbauth();
 307                         break;
 308                 case MODE_DECRYPT:      /* decrypt using CFB mode */
 309                         cfbdec();
 310                         break;
 311                 case MODE_ENCRYPT:      /* encrypt using CFB mode */
 312                         cfbenc();
 313                         break;
 314                 }
 315                 break;
 316         case ALG_CFBA:
 317                 switch(mode) {
 318                 case MODE_AUTHENTICATE: /* authenticate using CFBA mode */
 319                         bdes_err(-1, "can't authenticate with CFBA mode");
 320                         break;
 321                 case MODE_DECRYPT:      /* decrypt using CFBA mode */
 322                         cfbadec();
 323                         break;
 324                 case MODE_ENCRYPT:      /* encrypt using CFBA mode */
 325                         cfbaenc();
 326                         break;
 327                 }
 328                 break;
 329         case ALG_ECB:
 330                 switch(mode) {
 331                 case MODE_AUTHENTICATE: /* authenticate using ECB mode */
 332                         bdes_err(-1, "can't authenticate with ECB mode");
 333                         break;
 334                 case MODE_DECRYPT:      /* decrypt using ECB mode */
 335                         ecbdec();
 336                         break;
 337                 case MODE_ENCRYPT:      /* encrypt using ECB mode */
 338                         ecbenc();
 339                         break;
 340                 }
 341                 break;
 342         case ALG_OFB:
 343                 switch(mode) {
 344                 case MODE_AUTHENTICATE: /* authenticate using OFB mode */
 345                         bdes_err(-1, "can't authenticate with OFB mode");
 346                         break;
 347                 case MODE_DECRYPT:      /* decrypt using OFB mode */
 348                         ofbdec();
 349                         break;
 350                 case MODE_ENCRYPT:      /* encrypt using OFB mode */
 351                         ofbenc();
 352                         break;
 353                 }
 354                 break;
 355         }
 356         exit(0);
 357 }
 358
 359 /*
 360  * print a warning message and, possibly, terminate
 361  */
 362 static void
 363 bdes_err(int n, const char *s)
 364 {
 365         if (n > 0)
 366                 (void)fprintf(stderr, "bdes (block %d): ", n);
 367         else
 368                 (void)fprintf(stderr, "bdes: ");
 369         (void)fprintf(stderr, "%s\n", s ? s : strerror(errno));
 370         exit(1);
 371 }
 372
 373 /*
 374  * map a hex character to an integer
 375  */
 376 static int
 377 tobinhex(char c, int radix)
 378 {
 379         switch(c) {
 380         case '0':               return(0x0);
 381         case '1':               return(0x1);
 382         case '2':               return(radix > 2 ? 0x2 : -1);
 383         case '3':               return(radix > 3 ? 0x3 : -1);
 384         case '4':               return(radix > 4 ? 0x4 : -1);
 385         case '5':               return(radix > 5 ? 0x5 : -1);
 386         case '6':               return(radix > 6 ? 0x6 : -1);
 387         case '7':               return(radix > 7 ? 0x7 : -1);
 388         case '8':               return(radix > 8 ? 0x8 : -1);
 389         case '9':               return(radix > 9 ? 0x9 : -1);
 390         case 'A': case 'a':     return(radix > 10 ? 0xa : -1);
 391         case 'B': case 'b':     return(radix > 11 ? 0xb : -1);
 392         case 'C': case 'c':     return(radix > 12 ? 0xc : -1);
 393         case 'D': case 'd':     return(radix > 13 ? 0xd : -1);
 394         case 'E': case 'e':     return(radix > 14 ? 0xe : -1);
 395         case 'F': case 'f':     return(radix > 15 ? 0xf : -1);
 396         }
 397         /*
 398          * invalid character
 399          */
 400         return(-1);
 401 }
 402
 403 /*
 404  * convert the key to a bit pattern
 405  */
 406 static void
 407 cvtkey(char *obuf, char *ibuf)
 408 {
 409         register int i, j;              /* counter in a for loop */
 410         int nbuf[64];                   /* used for hex/key translation */
 411
 412         /*
 413          * just switch on the key base
 414          */
 415         switch(keybase) {
 416         case KEY_ASCII:                 /* ascii to integer */
 417                 (void)strncpy(obuf, ibuf, 8);
 418                 return;
 419         case KEY_DEFAULT:               /* tell from context */
 420                 /*
 421                  * leading '0x' or '0X' == hex key
 422                  */
 423                 if (ibuf[0] == '0' && (ibuf[1] == 'x' || ibuf[1] == 'X')) {
 424                         ibuf = &ibuf[2];
 425                         /*
 426                          * now translate it, bombing on any illegal hex digit
 427                          */
 428                         for (i = 0; ibuf[i] && i < 16; i++)
 429                                 if ((nbuf[i] = tobinhex(ibuf[i], 16)) == -1)
 430                                         bdes_err(-1, "bad hex digit in key");
 431                         while (i < 16)
 432                                 nbuf[i++] = 0;
 433                         for (i = 0; i < 8; i++)
 434                                 obuf[i] =
 435                                     ((nbuf[2*i]&0xf)<<4) | (nbuf[2*i+1]&0xf);
 436                         /* preserve parity bits */
 437                         pflag = 1;
 438                         return;
 439                 }
 440                 /*
 441                  * leading '0b' or '0B' == binary key
 442                  */
 443                 if (ibuf[0] == '0' && (ibuf[1] == 'b' || ibuf[1] == 'B')) {
 444                         ibuf = &ibuf[2];
 445                         /*
 446                          * now translate it, bombing on any illegal binary digit
 447                          */
 448                         for (i = 0; ibuf[i] && i < 16; i++)
 449                                 if ((nbuf[i] = tobinhex(ibuf[i], 2)) == -1)
 450                                         bdes_err(-1, "bad binary digit in key");
 451                         while (i < 64)
 452                                 nbuf[i++] = 0;
 453                         for (i = 0; i < 8; i++)
 454                                 for (j = 0; j < 8; j++)
 455                                         obuf[i] = (obuf[i]<<1)|nbuf[8*i+j];
 456                         /* preserve parity bits */
 457                         pflag = 1;
 458                         return;
 459                 }
 460                 /*
 461                  * no special leader -- ASCII
 462                  */
 463                 (void)strncpy(obuf, ibuf, 8);
 464         }
 465 }
 466
 467 /*
 468  * convert an ASCII string into a decimal number:
 469  * 1. must be between 0 and 64 inclusive (or 56, checked by caller)
 470  * 2. must be a valid decimal number
 471  * 3. must be a multiple of mult
 472  */
 473 static int
 474 setbits(char *s, int mult)
 475 {
 476         char *p;
 477         int n;          /* the integer collected */
 478
 479         n = strtoul(s, &p, 10);
 480         if (*p != 0)
 481                 bdes_err(-1, "bad decimal digit in MAC length");
 482         /*
 483          * be sure it's a multiple of mult
 484          */
 485         return((n % mult != 0) ? -1 : n);
 486 }
 487
 488 /*****************
 489  * DES FUNCTIONS *
 490  *****************/
 491 /*
 492  * This sets the DES key and (if you're using the deszip version)
 493  * the direction of the transformation.  This uses the Sun
 494  * to map the 64-bit key onto the 56 bits that the key schedule
 495  * generation routines use: the old way, which just uses the user-
 496  * supplied 64 bits as is, and the new way, which resets the parity
 497  * bit to be the same as the low-order bit in each character.  The
 498  * new way generates a greater variety of key schedules, since many
 499  * systems set the parity (high) bit of each character to 0, and the
 500  * DES ignores the low order bit of each character.
 501  */
 502 static void
 503 makekey(Desbuf buf)
 504 {
 505         register int i, j;                      /* counter in a for loop */
 506         register int par;                       /* parity counter */
 507
 508         /*
 509          * if the parity is not preserved, flip it
 510          */
 511         if (!pflag) {
 512                 for (i = 0; i < 8; i++) {
 513                         par = 0;
 514                         for (j = 1; j < 8; j++)
 515                                 if ((bits[j]&UCHAR(buf, i)) != 0)
 516                                         par++;
 517                         if ((par&01) == 01)
 518                                 UCHAR(buf, i) = UCHAR(buf, i)&0177;
 519                         else
 520                                 UCHAR(buf, i) = (UCHAR(buf, i)&0177)|0200;
 521                 }
 522         }
 523
 524         DES_KEY(UBUFFER(buf));
 525 }
 526
 527 /*
 528  * This encrypts using the Electronic Code Book mode of DES
 529  */
 530 static void
 531 ecbenc(void)
 532 {
 533         register int n;         /* number of bytes actually read */
 534         register int bn;        /* block number */
 535         Desbuf msgbuf;          /* I/O buffer */
 536
 537         for (bn = 0; (n = READ(BUFFER(msgbuf),  8)) == 8; bn++) {
 538                 /*
 539                  * do the transformation
 540                  */
 541                 DES_XFORM(UBUFFER(msgbuf));
 542                 WRITE(BUFFER(msgbuf), 8);
 543         }
 544         /*
 545          * at EOF or last block -- in either ase, the last byte contains
 546          * the character representation of the number of bytes in it
 547          */
 548         bn++;
 549         MEMZERO(&CHAR(msgbuf, n), 8 - n);
 550         CHAR(msgbuf, 7) = n;
 551         DES_XFORM(UBUFFER(msgbuf));
 552         WRITE(BUFFER(msgbuf), 8);
 553
 554 }
 555
 556 /*
 557  * This decrypts using the Electronic Code Book mode of DES
 558  */
 559 static void
 560 ecbdec(void)
 561 {
 562         register int n;         /* number of bytes actually read */
 563         register int c;         /* used to test for EOF */
 564         register int bn;        /* block number */
 565         Desbuf msgbuf;          /* I/O buffer */
 566
 567         for (bn = 1; (n = READ(BUFFER(msgbuf), 8)) == 8; bn++) {
 568                 /*
 569                  * do the transformation
 570                  */
 571                 DES_XFORM(UBUFFER(msgbuf));
 572                 /*
 573                  * if the last one, handle it specially
 574                  */
 575                 if ((c = getchar()) == EOF) {
 576                         n = CHAR(msgbuf, 7);
 577                         if (n < 0 || n > 7)
 578                                 bdes_err(bn,
 579                                     "decryption failed (block corrupted)");
 580                 }
 581                 else
 582                         (void)ungetc(c, stdin);
 583                 WRITE(BUFFER(msgbuf), n);
 584         }
 585         if (n > 0)
 586                 bdes_err(bn, "decryption failed (incomplete block)");
 587 }
 588
 589 /*
 590  * This encrypts using the Cipher Block Chaining mode of DES
 591  */
 592 static void
 593 cbcenc(void)
 594 {
 595         register int n;         /* number of bytes actually read */
 596         register int bn;        /* block number */
 597         Desbuf msgbuf;          /* I/O buffer */
 598
 599         /*
 600          * do the transformation
 601          */
 602         for (bn = 1; (n = READ(BUFFER(msgbuf), 8)) == 8; bn++) {
 603                 for (n = 0; n < 8; n++)
 604                         CHAR(msgbuf, n) ^= CHAR(ivec, n);
 605                 DES_XFORM(UBUFFER(msgbuf));
 606                 MEMCPY(BUFFER(ivec), BUFFER(msgbuf), 8);
 607                 WRITE(BUFFER(msgbuf), 8);
 608         }
 609         /*
 610          * at EOF or last block -- in either case, the last byte contains
 611          * the character representation of the number of bytes in it
 612          */
 613         bn++;
 614         MEMZERO(&CHAR(msgbuf, n), 8 - n);
 615         CHAR(msgbuf, 7) = n;
 616         for (n = 0; n < 8; n++)
 617                 CHAR(msgbuf, n) ^= CHAR(ivec, n);
 618         DES_XFORM(UBUFFER(msgbuf));
 619         WRITE(BUFFER(msgbuf), 8);
 620
 621 }
 622
 623 /*
 624  * This decrypts using the Cipher Block Chaining mode of DES
 625  */
 626 static void
 627 cbcdec(void)
 628 {
 629         register int n;         /* number of bytes actually read */
 630         Desbuf msgbuf;          /* I/O buffer */
 631         Desbuf ibuf;            /* temp buffer for initialization vector */
 632         register int c;         /* used to test for EOF */
 633         register int bn;        /* block number */
 634
 635         for (bn = 0; (n = READ(BUFFER(msgbuf), 8)) == 8; bn++) {
 636                 /*
 637                  * do the transformation
 638                  */
 639                 MEMCPY(BUFFER(ibuf), BUFFER(msgbuf), 8);
 640                 DES_XFORM(UBUFFER(msgbuf));
 641                 for (c = 0; c < 8; c++)
 642                         UCHAR(msgbuf, c) ^= UCHAR(ivec, c);
 643                 MEMCPY(BUFFER(ivec), BUFFER(ibuf), 8);
 644                 /*
 645                  * if the last one, handle it specially
 646                  */
 647                 if ((c = getchar()) == EOF) {
 648                         n = CHAR(msgbuf, 7);
 649                         if (n < 0 || n > 7)
 650                                 bdes_err(bn,
 651                                     "decryption failed (block corrupted)");
 652                 }
 653                 else
 654                         (void)ungetc(c, stdin);
 655                 WRITE(BUFFER(msgbuf), n);
 656         }
 657         if (n > 0)
 658                 bdes_err(bn, "decryption failed (incomplete block)");
 659 }
 660
 661 /*
 662  * This authenticates using the Cipher Block Chaining mode of DES
 663  */
 664 static void
 665 cbcauth(void)
 666 {
 667         register int n, j;              /* number of bytes actually read */
 668         Desbuf msgbuf;          /* I/O buffer */
 669         Desbuf encbuf;          /* encryption buffer */
 670
 671         /*
 672          * do the transformation
 673          * note we DISCARD the encrypted block;
 674          * we only care about the last one
 675          */
 676         while ((n = READ(BUFFER(msgbuf), 8)) == 8) {
 677                 for (n = 0; n < 8; n++)
 678                         CHAR(encbuf, n) = CHAR(msgbuf, n) ^ CHAR(ivec, n);
 679                 DES_XFORM(UBUFFER(encbuf));
 680                 MEMCPY(BUFFER(ivec), BUFFER(encbuf), 8);
 681         }
 682         /*
 683          * now compute the last one, right padding with '\0' if need be
 684          */
 685         if (n > 0) {
 686                 MEMZERO(&CHAR(msgbuf, n), 8 - n);
 687                 for (n = 0; n < 8; n++)
 688                         CHAR(encbuf, n) = CHAR(msgbuf, n) ^ CHAR(ivec, n);
 689                 DES_XFORM(UBUFFER(encbuf));
 690         }
 691         /*
 692          * drop the bits
 693          * we write chars until fewer than 7 bits,
 694          * and then pad the last one with 0 bits
 695          */
 696         for (n = 0; macbits > 7; n++, macbits -= 8)
 697                 (void)putchar(CHAR(encbuf, n));
 698         if (macbits > 0) {
 699                 CHAR(msgbuf, 0) = 0x00;
 700                 for (j = 0; j < macbits; j++)
 701                         CHAR(msgbuf, 0) |= (CHAR(encbuf, n)&bits[j]);
 702                 (void)putchar(CHAR(msgbuf, 0));
 703         }
 704 }
 705
 706 /*
 707  * This encrypts using the Cipher FeedBack mode of DES
 708  */
 709 static void
 710 cfbenc(void)
 711 {
 712         register int n;         /* number of bytes actually read */
 713         register int nbytes;    /* number of bytes to read */
 714         register int bn;        /* block number */
 715         char ibuf[8];           /* input buffer */
 716         Desbuf msgbuf;          /* encryption buffer */
 717
 718         /*
 719          * do things in bytes, not bits
 720          */
 721         nbytes = fbbits / 8;
 722         /*
 723          * do the transformation
 724          */
 725         for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) {
 726                 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
 727                 DES_XFORM(UBUFFER(msgbuf));
 728                 for (n = 0; n < 8 - nbytes; n++)
 729                         UCHAR(ivec, n) = UCHAR(ivec, n+nbytes);
 730                 for (n = 0; n < nbytes; n++)
 731                         UCHAR(ivec, 8-nbytes+n) = ibuf[n] ^ UCHAR(msgbuf, n);
 732                 WRITE(&CHAR(ivec, 8-nbytes), nbytes);
 733         }
 734         /*
 735          * at EOF or last block -- in either case, the last byte contains
 736          * the character representation of the number of bytes in it
 737          */
 738         bn++;
 739         MEMZERO(&ibuf[n], nbytes - n);
 740         ibuf[nbytes - 1] = n;
 741         MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
 742         DES_XFORM(UBUFFER(msgbuf));
 743         for (n = 0; n < nbytes; n++)
 744                 ibuf[n] ^= UCHAR(msgbuf, n);
 745         WRITE(ibuf, nbytes);
 746 }
 747
 748 /*
 749  * This decrypts using the Cipher Block Chaining mode of DES
 750  */
 751 static void
 752 cfbdec(void)
 753 {
 754         register int n;         /* number of bytes actually read */
 755         register int c;         /* used to test for EOF */
 756         register int nbytes;    /* number of bytes to read */
 757         register int bn;        /* block number */
 758         char ibuf[8];           /* input buffer */
 759         char obuf[8];           /* output buffer */
 760         Desbuf msgbuf;          /* encryption buffer */
 761
 762         /*
 763          * do things in bytes, not bits
 764          */
 765         nbytes = fbbits / 8;
 766         /*
 767          * do the transformation
 768          */
 769         for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) {
 770                 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
 771                 DES_XFORM(UBUFFER(msgbuf));
 772                 for (c = 0; c < 8 - nbytes; c++)
 773                         CHAR(ivec, c) = CHAR(ivec, c+nbytes);
 774                 for (c = 0; c < nbytes; c++) {
 775                         CHAR(ivec, 8-nbytes+c) = ibuf[c];
 776                         obuf[c] = ibuf[c] ^ UCHAR(msgbuf, c);
 777                 }
 778                 /*
 779                  * if the last one, handle it specially
 780                  */
 781                 if ((c = getchar()) == EOF) {
 782                         n = obuf[nbytes-1];
 783                         if (n < 0 || n > nbytes-1)
 784                                 bdes_err(bn,
 785                                     "decryption failed (block corrupted)");
 786                 }
 787                 else
 788                         (void)ungetc(c, stdin);
 789                 WRITE(obuf, n);
 790         }
 791         if (n > 0)
 792                 bdes_err(bn, "decryption failed (incomplete block)");
 793 }
 794
 795 /*
 796  * This encrypts using the alternative Cipher FeedBack mode of DES
 797  */
 798 static void
 799 cfbaenc(void)
 800 {
 801         register int n;         /* number of bytes actually read */
 802         register int nbytes;    /* number of bytes to read */
 803         register int bn;        /* block number */
 804         char ibuf[8];           /* input buffer */
 805         char obuf[8];           /* output buffer */
 806         Desbuf msgbuf;          /* encryption buffer */
 807
 808         /*
 809          * do things in bytes, not bits
 810          */
 811         nbytes = fbbits / 7;
 812         /*
 813          * do the transformation
 814          */
 815         for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) {
 816                 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
 817                 DES_XFORM(UBUFFER(msgbuf));
 818                 for (n = 0; n < 8 - nbytes; n++)
 819                         UCHAR(ivec, n) = UCHAR(ivec, n+nbytes);
 820                 for (n = 0; n < nbytes; n++)
 821                         UCHAR(ivec, 8-nbytes+n) = (ibuf[n] ^ UCHAR(msgbuf, n))
 822                                                         |0200;
 823                 for (n = 0; n < nbytes; n++)
 824                         obuf[n] = CHAR(ivec, 8-nbytes+n)&0177;
 825                 WRITE(obuf, nbytes);
 826         }
 827         /*
 828          * at EOF or last block -- in either case, the last byte contains
 829          * the character representation of the number of bytes in it
 830          */
 831         bn++;
 832         MEMZERO(&ibuf[n], nbytes - n);
 833         ibuf[nbytes - 1] = ('0' + n)|0200;
 834         MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
 835         DES_XFORM(UBUFFER(msgbuf));
 836         for (n = 0; n < nbytes; n++)
 837                 ibuf[n] ^= UCHAR(msgbuf, n);
 838         WRITE(ibuf, nbytes);
 839 }
 840
 841 /*
 842  * This decrypts using the alternative Cipher Block Chaining mode of DES
 843  */
 844 static void
 845 cfbadec(void)
 846 {
 847         register int n;         /* number of bytes actually read */
 848         register int c;         /* used to test for EOF */
 849         register int nbytes;    /* number of bytes to read */
 850         register int bn;        /* block number */
 851         char ibuf[8];           /* input buffer */
 852         char obuf[8];           /* output buffer */
 853         Desbuf msgbuf;          /* encryption buffer */
 854
 855         /*
 856          * do things in bytes, not bits
 857          */
 858         nbytes = fbbits / 7;
 859         /*
 860          * do the transformation
 861          */
 862         for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) {
 863                 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
 864                 DES_XFORM(UBUFFER(msgbuf));
 865                 for (c = 0; c < 8 - nbytes; c++)
 866                         CHAR(ivec, c) = CHAR(ivec, c+nbytes);
 867                 for (c = 0; c < nbytes; c++) {
 868                         CHAR(ivec, 8-nbytes+c) = ibuf[c]|0200;
 869                         obuf[c] = (ibuf[c] ^ UCHAR(msgbuf, c))&0177;
 870                 }
 871                 /*
 872                  * if the last one, handle it specially
 873                  */
 874                 if ((c = getchar()) == EOF) {
 875                         if ((n = (obuf[nbytes-1] - '0')) < 0
 876                                                 || n > nbytes-1)
 877                                 bdes_err(bn,
 878                                     "decryption failed (block corrupted)");
 879                 }
 880                 else
 881                         (void)ungetc(c, stdin);
 882                 WRITE(obuf, n);
 883         }
 884         if (n > 0)
 885                 bdes_err(bn, "decryption failed (incomplete block)");
 886 }
 887
 888
 889 /*
 890  * This encrypts using the Output FeedBack mode of DES
 891  */
 892 static void
 893 ofbenc(void)
 894 {
 895         register int n;         /* number of bytes actually read */
 896         register int c;         /* used to test for EOF */
 897         register int nbytes;    /* number of bytes to read */
 898         register int bn;        /* block number */
 899         char ibuf[8];           /* input buffer */
 900         char obuf[8];           /* output buffer */
 901         Desbuf msgbuf;          /* encryption buffer */
 902
 903         /*
 904          * do things in bytes, not bits
 905          */
 906         nbytes = fbbits / 8;
 907         /*
 908          * do the transformation
 909          */
 910         for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) {
 911                 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
 912                 DES_XFORM(UBUFFER(msgbuf));
 913                 for (n = 0; n < 8 - nbytes; n++)
 914                         UCHAR(ivec, n) = UCHAR(ivec, n+nbytes);
 915                 for (n = 0; n < nbytes; n++) {
 916                         UCHAR(ivec, 8-nbytes+n) = UCHAR(msgbuf, n);
 917                         obuf[n] = ibuf[n] ^ UCHAR(msgbuf, n);
 918                 }
 919                 WRITE(obuf, nbytes);
 920         }
 921         /*
 922          * at EOF or last block -- in either case, the last byte contains
 923          * the character representation of the number of bytes in it
 924          */
 925         bn++;
 926         MEMZERO(&ibuf[n], nbytes - n);
 927         ibuf[nbytes - 1] = n;
 928         MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
 929         DES_XFORM(UBUFFER(msgbuf));
 930         for (c = 0; c < nbytes; c++)
 931                 ibuf[c] ^= UCHAR(msgbuf, c);
 932         WRITE(ibuf, nbytes);
 933 }
 934
 935 /*
 936  * This decrypts using the Output Block Chaining mode of DES
 937  */
 938 static void
 939 ofbdec(void)
 940 {
 941         register int n;         /* number of bytes actually read */
 942         register int c;         /* used to test for EOF */
 943         register int nbytes;    /* number of bytes to read */
 944         register int bn;        /* block number */
 945         char ibuf[8];           /* input buffer */
 946         char obuf[8];           /* output buffer */
 947         Desbuf msgbuf;          /* encryption buffer */
 948
 949         /*
 950          * do things in bytes, not bits
 951          */
 952         nbytes = fbbits / 8;
 953         /*
 954          * do the transformation
 955          */
 956         for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) {
 957                 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
 958                 DES_XFORM(UBUFFER(msgbuf));
 959                 for (c = 0; c < 8 - nbytes; c++)
 960                         CHAR(ivec, c) = CHAR(ivec, c+nbytes);
 961                 for (c = 0; c < nbytes; c++) {
 962                         CHAR(ivec, 8-nbytes+c) = UCHAR(msgbuf, c);
 963                         obuf[c] = ibuf[c] ^ UCHAR(msgbuf, c);
 964                 }
 965                 /*
 966                  * if the last one, handle it specially
 967                  */
 968                 if ((c = getchar()) == EOF) {
 969                         n = obuf[nbytes-1];
 970                         if (n < 0 || n > nbytes-1)
 971                                 bdes_err(bn,
 972                                     "decryption failed (block corrupted)");
 973                 }
 974                 else
 975                         (void)ungetc(c, stdin);
 976                 /*
 977                  * dump it
 978                  */
 979                 WRITE(obuf, n);
 980         }
 981         if (n > 0)
 982                 bdes_err(bn, "decryption failed (incomplete block)");
 983 }
 984
 985 /*
 986  * This authenticates using the Cipher FeedBack mode of DES
 987  */
 988 static void
 989 cfbauth(void)
 990 {
 991         register int n, j;      /* number of bytes actually read */
 992         register int nbytes;    /* number of bytes to read */
 993         char ibuf[8];           /* input buffer */
 994         Desbuf msgbuf;          /* encryption buffer */
 995
 996         /*
 997          * do things in bytes, not bits
 998          */
 999         nbytes = fbbits / 8;
1000         /*
1001          * do the transformation
1002          */
1003         while ((n = READ(ibuf, nbytes)) == nbytes) {
1004                 MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
1005                 DES_XFORM(UBUFFER(msgbuf));
1006                 for (n = 0; n < 8 - nbytes; n++)
1007                         UCHAR(ivec, n) = UCHAR(ivec, n+nbytes);
1008                 for (n = 0; n < nbytes; n++)
1009                         UCHAR(ivec, 8-nbytes+n) = ibuf[n] ^ UCHAR(msgbuf, n);
1010         }
1011         /*
1012          * at EOF or last block -- in either case, the last byte contains
1013          * the character representation of the number of bytes in it
1014          */
1015         MEMZERO(&ibuf[n], nbytes - n);
1016         ibuf[nbytes - 1] = '0' + n;
1017         MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8);
1018         DES_XFORM(UBUFFER(msgbuf));
1019         for (n = 0; n < nbytes; n++)
1020                 ibuf[n] ^= UCHAR(msgbuf, n);
1021         /*
1022          * drop the bits
1023          * we write chars until fewer than 7 bits,
1024          * and then pad the last one with 0 bits
1025          */
1026         for (n = 0; macbits > 7; n++, macbits -= 8)
1027                 (void)putchar(CHAR(msgbuf, n));
1028         if (macbits > 0) {
1029                 CHAR(msgbuf, 0) = 0x00;
1030                 for (j = 0; j < macbits; j++)
1031                         CHAR(msgbuf, 0) |= (CHAR(msgbuf, n)&bits[j]);
1032                 (void)putchar(CHAR(msgbuf, 0));
1033         }
1034 }
1035
1036 #ifndef FASTWAY
1037 /*
1038  * change from 8 bits/Uchar to 1 bit/Uchar
1039  */
1040 static void
1041 expand(Desbuf from, char *to)
1042 {
1043         register int i, j;              /* counters in for loop */
1044
1045         for (i = 0; i < 8; i++)
1046                 for (j = 0; j < 8; j++)
1047                         *to++ = (CHAR(from, i)>>(7-j))&01;
1048 }
1049
1050 /*
1051  * change from 1 bit/char to 8 bits/Uchar
1052  */
1053 static void
1054 compress(char *from, Desbuf to)
1055 {
1056         register int i, j;              /* counters in for loop */
1057
1058         for (i = 0; i < 8; i++) {
1059                 CHAR(to, i) = 0;
1060                 for (j = 0; j < 8; j++)
1061                         CHAR(to, i) = ((*from++)<<(7-j))|CHAR(to, i);
1062         }
1063 }
1064 #endif
1065
1066 /*
1067  * message about usage
1068  */
1069 static void
1070 usage(void)
1071 {
1072
1073         (void) fprintf(stderr, "usage: %s %s\n", getprogname(),
1074             "[-abdp] [-F bit] [-f bit] [-k key] [-m bit] [-o bit] [-v vector]");
1075         exit(1);
1076 }