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Diffstat (limited to 'usr.bin/bdes/bdes.c')
| -rw-r--r-- | usr.bin/bdes/bdes.c | 1046 |
1 files changed, 0 insertions, 1046 deletions
diff --git a/usr.bin/bdes/bdes.c b/usr.bin/bdes/bdes.c deleted file mode 100644 index f702e01..0000000 --- a/usr.bin/bdes/bdes.c +++ /dev/null @@ -1,1046 +0,0 @@ -/*- - * Copyright (c) 1991, 1993 - * The Regents of the University of California. All rights reserved. - * - * This code is derived from software contributed to Berkeley by - * Matt Bishop of Dartmouth College. - * - * The United States Government has rights in this work pursuant - * to contract no. NAG 2-680 between the National Aeronautics and - * Space Administration and Dartmouth College. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#ifndef lint -static char copyright[] = -"@(#) Copyright (c) 1991, 1993\n\ - The Regents of the University of California. All rights reserved.\n"; -#endif /* not lint */ - -#ifndef lint -static char sccsid[] = "@(#)bdes.c 8.1 (Berkeley) 6/6/93"; -#endif /* not lint */ - -/* - * BDES -- DES encryption package for Berkeley Software Distribution 4.4 - * options: - * -a key is in ASCII - * -b use ECB (electronic code book) mode - * -d invert (decrypt) input - * -f b use b-bit CFB (cipher feedback) mode - * -F b use b-bit CFB (cipher feedback) alternative mode - * -k key use key as the cryptographic key - * -m b generate a MAC of length b - * -o b use b-bit OFB (output feedback) mode - * -p don't reset the parity bit - * -v v use v as the initialization vector (ignored for ECB) - * note: the last character of the last block is the integer indicating - * how many characters of that block are to be output - * - * Author: Matt Bishop - * Department of Mathematics and Computer Science - * Dartmouth College - * Hanover, NH 03755 - * Email: Matt.Bishop@dartmouth.edu - * ...!decvax!dartvax!Matt.Bishop - * - * See Technical Report PCS-TR91-158, Department of Mathematics and Computer - * Science, Dartmouth College, for a detailed description of the implemen- - * tation and differences between it and Sun's. The DES is described in - * FIPS PUB 46, and the modes in FIPS PUB 81 (see either the manual page - * or the technical report for a complete reference). - */ - -#include <errno.h> -#include <unistd.h> -#include <stdio.h> -#include <ctype.h> -#include <stdlib.h> -#include <string.h> - -/* - * BSD and System V systems offer special library calls that do - * block moves and fills, so if possible we take advantage of them - */ -#define MEMCPY(dest,src,len) bcopy((src),(dest),(len)) -#define MEMZERO(dest,len) bzero((dest),(len)) - -/* Hide the calls to the primitive encryption routines. */ -#define FASTWAY -#ifdef FASTWAY -#define DES_KEY(buf) \ - if (des_setkey(buf)) \ - err("des_setkey", 0); -#define DES_XFORM(buf) \ - if (des_cipher(buf, buf, 0L, (inverse ? -1 : 1))) \ - err("des_cipher", 0); -#else -#define DES_KEY(buf) { \ - char bits1[64]; /* bits of key */ \ - expand(buf, bits1); \ - if (setkey(bits1)) \ - err("setkey", 0); \ - } -#define DES_XFORM(buf) { \ - char bits1[64]; /* bits of message */ \ - expand(buf, bits1); \ - if (encrypt(bits1, inverse)) \ - err("encrypt", 0); \ - compress(bits1, buf); \ - } -#endif - -/* - * this does an error-checking write - */ -#define READ(buf, n) fread(buf, sizeof(char), n, stdin) -#define WRITE(buf,n) \ - if (fwrite(buf, sizeof(char), n, stdout) != n) \ - err(bn, NULL); - -/* - * some things to make references easier - */ -typedef char Desbuf[8]; -#define CHAR(x,i) (x[i]) -#define UCHAR(x,i) (x[i]) -#define BUFFER(x) (x) -#define UBUFFER(x) (x) - -/* - * global variables and related macros - */ -#define KEY_DEFAULT 0 /* interpret radix of key from key */ -#define KEY_ASCII 1 /* key is in ASCII characters */ -int keybase = KEY_DEFAULT; /* how to interpret the key */ - -enum { /* encrypt, decrypt, authenticate */ - MODE_ENCRYPT, MODE_DECRYPT, MODE_AUTHENTICATE -} mode = MODE_ENCRYPT; -enum { /* ecb, cbc, cfb, cfba, ofb? */ - ALG_ECB, ALG_CBC, ALG_CFB, ALG_OFB, ALG_CFBA -} alg = ALG_CBC; - -Desbuf ivec; /* initialization vector */ -char bits[] = { /* used to extract bits from a char */ - '\200', '\100', '\040', '\020', '\010', '\004', '\002', '\001' -}; -int inverse; /* 0 to encrypt, 1 to decrypt */ -int macbits = -1; /* number of bits in authentication */ -int fbbits = -1; /* number of feedback bits */ -int pflag; /* 1 to preserve parity bits */ - -main(ac, av) - int ac; /* arg count */ - char **av; /* arg vector */ -{ - extern int optind; /* option (argument) number */ - extern char *optarg; /* argument to option if any */ - register int i; /* counter in a for loop */ - register char *p; /* used to obtain the key */ - Desbuf msgbuf; /* I/O buffer */ - int kflag; /* command-line encryptiooon key */ - int argc; /* the real arg count */ - char **argv; /* the real argument vector */ - - /* - * Hide the arguments from ps(1) by making private copies of them - * and clobbering the global (visible to ps(1)) ones. - */ - argc = ac; - ac = 1; - argv = malloc((argc + 1) * sizeof(char *)); - for (i = 0; i < argc; ++i) { - argv[i] = strdup(av[i]); - MEMZERO(av[i], strlen(av[i])); - } - argv[argc] = NULL; - - /* initialize the initialization vctor */ - MEMZERO(ivec, 8); - - /* process the argument list */ - kflag = 0; - while ((i = getopt(argc, argv, "abdF:f:k:m:o:pv:")) != EOF) - switch(i) { - case 'a': /* key is ASCII */ - keybase = KEY_ASCII; - break; - case 'b': /* use ECB mode */ - alg = ALG_ECB; - break; - case 'd': /* decrypt */ - mode = MODE_DECRYPT; - break; - case 'F': /* use alternative CFB mode */ - alg = ALG_CFBA; - if ((fbbits = setbits(optarg, 7)) > 56 || fbbits == 0) - err(-1, "-F: number must be 1-56 inclusive"); - else if (fbbits == -1) - err(-1, "-F: number must be a multiple of 7"); - break; - case 'f': /* use CFB mode */ - alg = ALG_CFB; - if ((fbbits = setbits(optarg, 8)) > 64 || fbbits == 0) - err(-1, "-f: number must be 1-64 inclusive"); - else if (fbbits == -1) - err(-1, "-f: number must be a multiple of 8"); - break; - case 'k': /* encryption key */ - kflag = 1; - cvtkey(BUFFER(msgbuf), optarg); - break; - case 'm': /* number of bits for MACing */ - mode = MODE_AUTHENTICATE; - if ((macbits = setbits(optarg, 1)) > 64) - err(-1, "-m: number must be 0-64 inclusive"); - break; - case 'o': /* use OFB mode */ - alg = ALG_OFB; - if ((fbbits = setbits(optarg, 8)) > 64 || fbbits == 0) - err(-1, "-o: number must be 1-64 inclusive"); - else if (fbbits == -1) - err(-1, "-o: number must be a multiple of 8"); - break; - case 'p': /* preserve parity bits */ - pflag = 1; - break; - case 'v': /* set initialization vector */ - cvtkey(BUFFER(ivec), optarg); - break; - default: /* error */ - usage(); - } - - if (!kflag) { - /* - * if the key's not ASCII, assume it is - */ - keybase = KEY_ASCII; - /* - * get the key - */ - p = getpass("Enter key: "); - /* - * copy it, nul-padded, into the key area - */ - cvtkey(BUFFER(msgbuf), p); - } - - makekey(msgbuf); - inverse = (alg == ALG_CBC || alg == ALG_ECB) && mode == MODE_DECRYPT; - - switch(alg) { - case ALG_CBC: - switch(mode) { - case MODE_AUTHENTICATE: /* authenticate using CBC mode */ - cbcauth(); - break; - case MODE_DECRYPT: /* decrypt using CBC mode */ - cbcdec(); - break; - case MODE_ENCRYPT: /* encrypt using CBC mode */ - cbcenc(); - break; - } - break; - case ALG_CFB: - switch(mode) { - case MODE_AUTHENTICATE: /* authenticate using CFB mode */ - cfbauth(); - break; - case MODE_DECRYPT: /* decrypt using CFB mode */ - cfbdec(); - break; - case MODE_ENCRYPT: /* encrypt using CFB mode */ - cfbenc(); - break; - } - break; - case ALG_CFBA: - switch(mode) { - case MODE_AUTHENTICATE: /* authenticate using CFBA mode */ - err(-1, "can't authenticate with CFBA mode"); - break; - case MODE_DECRYPT: /* decrypt using CFBA mode */ - cfbadec(); - break; - case MODE_ENCRYPT: /* encrypt using CFBA mode */ - cfbaenc(); - break; - } - break; - case ALG_ECB: - switch(mode) { - case MODE_AUTHENTICATE: /* authenticate using ECB mode */ - err(-1, "can't authenticate with ECB mode"); - break; - case MODE_DECRYPT: /* decrypt using ECB mode */ - ecbdec(); - break; - case MODE_ENCRYPT: /* encrypt using ECB mode */ - ecbenc(); - break; - } - break; - case ALG_OFB: - switch(mode) { - case MODE_AUTHENTICATE: /* authenticate using OFB mode */ - err(-1, "can't authenticate with OFB mode"); - break; - case MODE_DECRYPT: /* decrypt using OFB mode */ - ofbdec(); - break; - case MODE_ENCRYPT: /* encrypt using OFB mode */ - ofbenc(); - break; - } - break; - } - exit(0); -} - -/* - * print a warning message and, possibly, terminate - */ -err(n, s) - int n; /* offending block number */ - char *s; /* the message */ -{ - if (n > 0) - (void)fprintf(stderr, "bdes (block %d): ", n); - else - (void)fprintf(stderr, "bdes: "); - (void)fprintf(stderr, "%s\n", s ? s : strerror(errno)); - exit(1); -} - -/* - * map a hex character to an integer - */ -tobinhex(c, radix) - char c; /* char to be converted */ - int radix; /* base (2 to 16) */ -{ - switch(c) { - case '0': return(0x0); - case '1': return(0x1); - case '2': return(radix > 2 ? 0x2 : -1); - case '3': return(radix > 3 ? 0x3 : -1); - case '4': return(radix > 4 ? 0x4 : -1); - case '5': return(radix > 5 ? 0x5 : -1); - case '6': return(radix > 6 ? 0x6 : -1); - case '7': return(radix > 7 ? 0x7 : -1); - case '8': return(radix > 8 ? 0x8 : -1); - case '9': return(radix > 9 ? 0x9 : -1); - case 'A': case 'a': return(radix > 10 ? 0xa : -1); - case 'B': case 'b': return(radix > 11 ? 0xb : -1); - case 'C': case 'c': return(radix > 12 ? 0xc : -1); - case 'D': case 'd': return(radix > 13 ? 0xd : -1); - case 'E': case 'e': return(radix > 14 ? 0xe : -1); - case 'F': case 'f': return(radix > 15 ? 0xf : -1); - } - /* - * invalid character - */ - return(-1); -} - -/* - * convert the key to a bit pattern - */ -cvtkey(obuf, ibuf) - char *obuf; /* bit pattern */ - char *ibuf; /* the key itself */ -{ - register int i, j; /* counter in a for loop */ - int nbuf[64]; /* used for hex/key translation */ - - /* - * just switch on the key base - */ - switch(keybase) { - case KEY_ASCII: /* ascii to integer */ - (void)strncpy(obuf, ibuf, 8); - return; - case KEY_DEFAULT: /* tell from context */ - /* - * leading '0x' or '0X' == hex key - */ - if (ibuf[0] == '0' && (ibuf[1] == 'x' || ibuf[1] == 'X')) { - ibuf = &ibuf[2]; - /* - * now translate it, bombing on any illegal hex digit - */ - for (i = 0; ibuf[i] && i < 16; i++) - if ((nbuf[i] = tobinhex(ibuf[i], 16)) == -1) - err(-1, "bad hex digit in key"); - while (i < 16) - nbuf[i++] = 0; - for (i = 0; i < 8; i++) - obuf[i] = - ((nbuf[2*i]&0xf)<<4) | (nbuf[2*i+1]&0xf); - /* preserve parity bits */ - pflag = 1; - return; - } - /* - * leading '0b' or '0B' == binary key - */ - if (ibuf[0] == '0' && (ibuf[1] == 'b' || ibuf[1] == 'B')) { - ibuf = &ibuf[2]; - /* - * now translate it, bombing on any illegal binary digit - */ - for (i = 0; ibuf[i] && i < 16; i++) - if ((nbuf[i] = tobinhex(ibuf[i], 2)) == -1) - err(-1, "bad binary digit in key"); - while (i < 64) - nbuf[i++] = 0; - for (i = 0; i < 8; i++) - for (j = 0; j < 8; j++) - obuf[i] = (obuf[i]<<1)|nbuf[8*i+j]; - /* preserve parity bits */ - pflag = 1; - return; - } - /* - * no special leader -- ASCII - */ - (void)strncpy(obuf, ibuf, 8); - } -} - -/* - * convert an ASCII string into a decimal number: - * 1. must be between 0 and 64 inclusive - * 2. must be a valid decimal number - * 3. must be a multiple of mult - */ -setbits(s, mult) - char *s; /* the ASCII string */ - int mult; /* what it must be a multiple of */ -{ - register char *p; /* pointer in a for loop */ - register int n = 0; /* the integer collected */ - - /* - * skip white space - */ - while (isspace(*s)) - s++; - /* - * get the integer - */ - for (p = s; *p; p++) { - if (isdigit(*p)) - n = n * 10 + *p - '0'; - else { - err(-1, "bad decimal digit in MAC length"); - } - } - /* - * be sure it's a multiple of mult - */ - return((n % mult != 0) ? -1 : n); -} - -/***************** - * DES FUNCTIONS * - *****************/ -/* - * This sets the DES key and (if you're using the deszip version) - * the direction of the transformation. This uses the Sun - * to map the 64-bit key onto the 56 bits that the key schedule - * generation routines use: the old way, which just uses the user- - * supplied 64 bits as is, and the new way, which resets the parity - * bit to be the same as the low-order bit in each character. The - * new way generates a greater variety of key schedules, since many - * systems set the parity (high) bit of each character to 0, and the - * DES ignores the low order bit of each character. - */ -makekey(buf) - Desbuf buf; /* key block */ -{ - register int i, j; /* counter in a for loop */ - register int par; /* parity counter */ - - /* - * if the parity is not preserved, flip it - */ - if (!pflag) { - for (i = 0; i < 8; i++) { - par = 0; - for (j = 1; j < 8; j++) - if ((bits[j]&UCHAR(buf, i)) != 0) - par++; - if ((par&01) == 01) - UCHAR(buf, i) = UCHAR(buf, i)&0177; - else - UCHAR(buf, i) = (UCHAR(buf, i)&0177)|0200; - } - } - - DES_KEY(UBUFFER(buf)); -} - -/* - * This encrypts using the Electronic Code Book mode of DES - */ -ecbenc() -{ - register int n; /* number of bytes actually read */ - register int bn; /* block number */ - Desbuf msgbuf; /* I/O buffer */ - - for (bn = 0; (n = READ(BUFFER(msgbuf), 8)) == 8; bn++) { - /* - * do the transformation - */ - DES_XFORM(UBUFFER(msgbuf)); - WRITE(BUFFER(msgbuf), 8); - } - /* - * at EOF or last block -- in either ase, the last byte contains - * the character representation of the number of bytes in it - */ - bn++; - MEMZERO(&CHAR(msgbuf, n), 8 - n); - CHAR(msgbuf, 7) = n; - DES_XFORM(UBUFFER(msgbuf)); - WRITE(BUFFER(msgbuf), 8); - -} - -/* - * This decrypts using the Electronic Code Book mode of DES - */ -ecbdec() -{ - register int n; /* number of bytes actually read */ - register int c; /* used to test for EOF */ - register int bn; /* block number */ - Desbuf msgbuf; /* I/O buffer */ - - for (bn = 1; (n = READ(BUFFER(msgbuf), 8)) == 8; bn++) { - /* - * do the transformation - */ - DES_XFORM(UBUFFER(msgbuf)); - /* - * if the last one, handle it specially - */ - if ((c = getchar()) == EOF) { - n = CHAR(msgbuf, 7); - if (n < 0 || n > 7) - err(bn, "decryption failed (block corrupted)"); - } - else - (void)ungetc(c, stdin); - WRITE(BUFFER(msgbuf), n); - } - if (n > 0) - err(bn, "decryption failed (incomplete block)"); -} - -/* - * This encrypts using the Cipher Block Chaining mode of DES - */ -cbcenc() -{ - register int n; /* number of bytes actually read */ - register int bn; /* block number */ - Desbuf msgbuf; /* I/O buffer */ - - /* - * do the transformation - */ - for (bn = 1; (n = READ(BUFFER(msgbuf), 8)) == 8; bn++) { - for (n = 0; n < 8; n++) - CHAR(msgbuf, n) ^= CHAR(ivec, n); - DES_XFORM(UBUFFER(msgbuf)); - MEMCPY(BUFFER(ivec), BUFFER(msgbuf), 8); - WRITE(BUFFER(msgbuf), 8); - } - /* - * at EOF or last block -- in either case, the last byte contains - * the character representation of the number of bytes in it - */ - bn++; - MEMZERO(&CHAR(msgbuf, n), 8 - n); - CHAR(msgbuf, 7) = n; - for (n = 0; n < 8; n++) - CHAR(msgbuf, n) ^= CHAR(ivec, n); - DES_XFORM(UBUFFER(msgbuf)); - WRITE(BUFFER(msgbuf), 8); - -} - -/* - * This decrypts using the Cipher Block Chaining mode of DES - */ -cbcdec() -{ - register int n; /* number of bytes actually read */ - Desbuf msgbuf; /* I/O buffer */ - Desbuf ibuf; /* temp buffer for initialization vector */ - register int c; /* used to test for EOF */ - register int bn; /* block number */ - - for (bn = 0; (n = READ(BUFFER(msgbuf), 8)) == 8; bn++) { - /* - * do the transformation - */ - MEMCPY(BUFFER(ibuf), BUFFER(msgbuf), 8); - DES_XFORM(UBUFFER(msgbuf)); - for (c = 0; c < 8; c++) - UCHAR(msgbuf, c) ^= UCHAR(ivec, c); - MEMCPY(BUFFER(ivec), BUFFER(ibuf), 8); - /* - * if the last one, handle it specially - */ - if ((c = getchar()) == EOF) { - n = CHAR(msgbuf, 7); - if (n < 0 || n > 7) - err(bn, "decryption failed (block corrupted)"); - } - else - (void)ungetc(c, stdin); - WRITE(BUFFER(msgbuf), n); - } - if (n > 0) - err(bn, "decryption failed (incomplete block)"); -} - -/* - * This authenticates using the Cipher Block Chaining mode of DES - */ -cbcauth() -{ - register int n, j; /* number of bytes actually read */ - Desbuf msgbuf; /* I/O buffer */ - Desbuf encbuf; /* encryption buffer */ - - /* - * do the transformation - * note we DISCARD the encrypted block; - * we only care about the last one - */ - while ((n = READ(BUFFER(msgbuf), 8)) == 8) { - for (n = 0; n < 8; n++) - CHAR(encbuf, n) = CHAR(msgbuf, n) ^ CHAR(ivec, n); - DES_XFORM(UBUFFER(encbuf)); - MEMCPY(BUFFER(ivec), BUFFER(encbuf), 8); - } - /* - * now compute the last one, right padding with '\0' if need be - */ - if (n > 0) { - MEMZERO(&CHAR(msgbuf, n), 8 - n); - for (n = 0; n < 8; n++) - CHAR(encbuf, n) = CHAR(msgbuf, n) ^ CHAR(ivec, n); - DES_XFORM(UBUFFER(encbuf)); - } - /* - * drop the bits - * we write chars until fewer than 7 bits, - * and then pad the last one with 0 bits - */ - for (n = 0; macbits > 7; n++, macbits -= 8) - (void)putchar(CHAR(encbuf, n)); - if (macbits > 0) { - CHAR(msgbuf, 0) = 0x00; - for (j = 0; j < macbits; j++) - CHAR(msgbuf, 0) |= (CHAR(encbuf, n)&bits[j]); - (void)putchar(CHAR(msgbuf, 0)); - } -} - -/* - * This encrypts using the Cipher FeedBack mode of DES - */ -cfbenc() -{ - register int n; /* number of bytes actually read */ - register int nbytes; /* number of bytes to read */ - register int bn; /* block number */ - char ibuf[8]; /* input buffer */ - Desbuf msgbuf; /* encryption buffer */ - - /* - * do things in bytes, not bits - */ - nbytes = fbbits / 8; - /* - * do the transformation - */ - for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) { - MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); - DES_XFORM(UBUFFER(msgbuf)); - for (n = 0; n < 8 - nbytes; n++) - UCHAR(ivec, n) = UCHAR(ivec, n+nbytes); - for (n = 0; n < nbytes; n++) - UCHAR(ivec, 8-nbytes+n) = ibuf[n] ^ UCHAR(msgbuf, n); - WRITE(&CHAR(ivec, 8-nbytes), nbytes); - } - /* - * at EOF or last block -- in either case, the last byte contains - * the character representation of the number of bytes in it - */ - bn++; - MEMZERO(&ibuf[n], nbytes - n); - ibuf[nbytes - 1] = n; - MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); - DES_XFORM(UBUFFER(msgbuf)); - for (n = 0; n < nbytes; n++) - ibuf[n] ^= UCHAR(msgbuf, n); - WRITE(ibuf, nbytes); -} - -/* - * This decrypts using the Cipher Block Chaining mode of DES - */ -cfbdec() -{ - register int n; /* number of bytes actually read */ - register int c; /* used to test for EOF */ - register int nbytes; /* number of bytes to read */ - register int bn; /* block number */ - char ibuf[8]; /* input buffer */ - char obuf[8]; /* output buffer */ - Desbuf msgbuf; /* encryption buffer */ - - /* - * do things in bytes, not bits - */ - nbytes = fbbits / 8; - /* - * do the transformation - */ - for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) { - MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); - DES_XFORM(UBUFFER(msgbuf)); - for (c = 0; c < 8 - nbytes; c++) - CHAR(ivec, c) = CHAR(ivec, c+nbytes); - for (c = 0; c < nbytes; c++) { - CHAR(ivec, 8-nbytes+c) = ibuf[c]; - obuf[c] = ibuf[c] ^ UCHAR(msgbuf, c); - } - /* - * if the last one, handle it specially - */ - if ((c = getchar()) == EOF) { - n = obuf[nbytes-1]; - if (n < 0 || n > nbytes-1) - err(bn, "decryption failed (block corrupted)"); - } - else - (void)ungetc(c, stdin); - WRITE(obuf, n); - } - if (n > 0) - err(bn, "decryption failed (incomplete block)"); -} - -/* - * This encrypts using the alternative Cipher FeedBack mode of DES - */ -cfbaenc() -{ - register int n; /* number of bytes actually read */ - register int nbytes; /* number of bytes to read */ - register int bn; /* block number */ - char ibuf[8]; /* input buffer */ - char obuf[8]; /* output buffer */ - Desbuf msgbuf; /* encryption buffer */ - - /* - * do things in bytes, not bits - */ - nbytes = fbbits / 7; - /* - * do the transformation - */ - for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) { - MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); - DES_XFORM(UBUFFER(msgbuf)); - for (n = 0; n < 8 - nbytes; n++) - UCHAR(ivec, n) = UCHAR(ivec, n+nbytes); - for (n = 0; n < nbytes; n++) - UCHAR(ivec, 8-nbytes+n) = (ibuf[n] ^ UCHAR(msgbuf, n)) - |0200; - for (n = 0; n < nbytes; n++) - obuf[n] = CHAR(ivec, 8-nbytes+n)&0177; - WRITE(obuf, nbytes); - } - /* - * at EOF or last block -- in either case, the last byte contains - * the character representation of the number of bytes in it - */ - bn++; - MEMZERO(&ibuf[n], nbytes - n); - ibuf[nbytes - 1] = ('0' + n)|0200; - MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); - DES_XFORM(UBUFFER(msgbuf)); - for (n = 0; n < nbytes; n++) - ibuf[n] ^= UCHAR(msgbuf, n); - WRITE(ibuf, nbytes); -} - -/* - * This decrypts using the alternative Cipher Block Chaining mode of DES - */ -cfbadec() -{ - register int n; /* number of bytes actually read */ - register int c; /* used to test for EOF */ - register int nbytes; /* number of bytes to read */ - register int bn; /* block number */ - char ibuf[8]; /* input buffer */ - char obuf[8]; /* output buffer */ - Desbuf msgbuf; /* encryption buffer */ - - /* - * do things in bytes, not bits - */ - nbytes = fbbits / 7; - /* - * do the transformation - */ - for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) { - MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); - DES_XFORM(UBUFFER(msgbuf)); - for (c = 0; c < 8 - nbytes; c++) - CHAR(ivec, c) = CHAR(ivec, c+nbytes); - for (c = 0; c < nbytes; c++) { - CHAR(ivec, 8-nbytes+c) = ibuf[c]|0200; - obuf[c] = (ibuf[c] ^ UCHAR(msgbuf, c))&0177; - } - /* - * if the last one, handle it specially - */ - if ((c = getchar()) == EOF) { - if ((n = (obuf[nbytes-1] - '0')) < 0 - || n > nbytes-1) - err(bn, "decryption failed (block corrupted)"); - } - else - (void)ungetc(c, stdin); - WRITE(obuf, n); - } - if (n > 0) - err(bn, "decryption failed (incomplete block)"); -} - - -/* - * This encrypts using the Output FeedBack mode of DES - */ -ofbenc() -{ - register int n; /* number of bytes actually read */ - register int c; /* used to test for EOF */ - register int nbytes; /* number of bytes to read */ - register int bn; /* block number */ - char ibuf[8]; /* input buffer */ - char obuf[8]; /* output buffer */ - Desbuf msgbuf; /* encryption buffer */ - - /* - * do things in bytes, not bits - */ - nbytes = fbbits / 8; - /* - * do the transformation - */ - for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) { - MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); - DES_XFORM(UBUFFER(msgbuf)); - for (n = 0; n < 8 - nbytes; n++) - UCHAR(ivec, n) = UCHAR(ivec, n+nbytes); - for (n = 0; n < nbytes; n++) { - UCHAR(ivec, 8-nbytes+n) = UCHAR(msgbuf, n); - obuf[n] = ibuf[n] ^ UCHAR(msgbuf, n); - } - WRITE(obuf, nbytes); - } - /* - * at EOF or last block -- in either case, the last byte contains - * the character representation of the number of bytes in it - */ - bn++; - MEMZERO(&ibuf[n], nbytes - n); - ibuf[nbytes - 1] = n; - MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); - DES_XFORM(UBUFFER(msgbuf)); - for (c = 0; c < nbytes; c++) - ibuf[c] ^= UCHAR(msgbuf, c); - WRITE(ibuf, nbytes); -} - -/* - * This decrypts using the Output Block Chaining mode of DES - */ -ofbdec() -{ - register int n; /* number of bytes actually read */ - register int c; /* used to test for EOF */ - register int nbytes; /* number of bytes to read */ - register int bn; /* block number */ - char ibuf[8]; /* input buffer */ - char obuf[8]; /* output buffer */ - Desbuf msgbuf; /* encryption buffer */ - - /* - * do things in bytes, not bits - */ - nbytes = fbbits / 8; - /* - * do the transformation - */ - for (bn = 1; (n = READ(ibuf, nbytes)) == nbytes; bn++) { - MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); - DES_XFORM(UBUFFER(msgbuf)); - for (c = 0; c < 8 - nbytes; c++) - CHAR(ivec, c) = CHAR(ivec, c+nbytes); - for (c = 0; c < nbytes; c++) { - CHAR(ivec, 8-nbytes+c) = UCHAR(msgbuf, c); - obuf[c] = ibuf[c] ^ UCHAR(msgbuf, c); - } - /* - * if the last one, handle it specially - */ - if ((c = getchar()) == EOF) { - n = obuf[nbytes-1]; - if (n < 0 || n > nbytes-1) - err(bn, "decryption failed (block corrupted)"); - } - else - (void)ungetc(c, stdin); - /* - * dump it - */ - WRITE(obuf, n); - } - if (n > 0) - err(bn, "decryption failed (incomplete block)"); -} - -/* - * This authenticates using the Cipher FeedBack mode of DES - */ -cfbauth() -{ - register int n, j; /* number of bytes actually read */ - register int nbytes; /* number of bytes to read */ - char ibuf[8]; /* input buffer */ - Desbuf msgbuf; /* encryption buffer */ - - /* - * do things in bytes, not bits - */ - nbytes = fbbits / 8; - /* - * do the transformation - */ - while ((n = READ(ibuf, nbytes)) == nbytes) { - MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); - DES_XFORM(UBUFFER(msgbuf)); - for (n = 0; n < 8 - nbytes; n++) - UCHAR(ivec, n) = UCHAR(ivec, n+nbytes); - for (n = 0; n < nbytes; n++) - UCHAR(ivec, 8-nbytes+n) = ibuf[n] ^ UCHAR(msgbuf, n); - } - /* - * at EOF or last block -- in either case, the last byte contains - * the character representation of the number of bytes in it - */ - MEMZERO(&ibuf[n], nbytes - n); - ibuf[nbytes - 1] = '0' + n; - MEMCPY(BUFFER(msgbuf), BUFFER(ivec), 8); - DES_XFORM(UBUFFER(msgbuf)); - for (n = 0; n < nbytes; n++) - ibuf[n] ^= UCHAR(msgbuf, n); - /* - * drop the bits - * we write chars until fewer than 7 bits, - * and then pad the last one with 0 bits - */ - for (n = 0; macbits > 7; n++, macbits -= 8) - (void)putchar(CHAR(msgbuf, n)); - if (macbits > 0) { - CHAR(msgbuf, 0) = 0x00; - for (j = 0; j < macbits; j++) - CHAR(msgbuf, 0) |= (CHAR(msgbuf, n)&bits[j]); - (void)putchar(CHAR(msgbuf, 0)); - } -} - -#ifndef FASTWAY -/* - * change from 8 bits/Uchar to 1 bit/Uchar - */ -expand(from, to) - Desbuf from; /* 8bit/unsigned char string */ - char *to; /* 1bit/char string */ -{ - register int i, j; /* counters in for loop */ - - for (i = 0; i < 8; i++) - for (j = 0; j < 8; j++) - *to++ = (CHAR(from, i)>>(7-j))&01; -} - -/* - * change from 1 bit/char to 8 bits/Uchar - */ -compress(from, to) - char *from; /* 1bit/char string */ - Desbuf to; /* 8bit/unsigned char string */ -{ - register int i, j; /* counters in for loop */ - - for (i = 0; i < 8; i++) { - CHAR(to, i) = 0; - for (j = 0; j < 8; j++) - CHAR(to, i) = ((*from++)<<(7-j))|CHAR(to, i); - } -} -#endif - -/* - * message about usage - */ -usage() -{ - (void)fprintf(stderr, "%s\n", -"usage: bdes [-abdp] [-F bit] [-f bit] [-k key] [-m bit] [-o bit] [-v vector]"); - exit(1); -} |
