--- /dev/null
+/* $NetBSD: bdes.c,v 1.2 1995/03/26 03:33:19 glass Exp $ */
+
+/*-
+ * 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
+#if 0
+static char sccsid[] = "@(#)bdes.c 8.1 (Berkeley) 6/6/93";
+#else
+static char rcsid[] = "$NetBSD: bdes.c,v 1.2 1995/03/26 03:33:19 glass Exp $";
+#endif
+#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);
+}
projects / openbsd / commitdiff