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Diffstat (limited to 'secure/usr.bin/bdes/bdes.c')
| -rw-r--r-- | secure/usr.bin/bdes/bdes.c | 1018 |
1 files changed, 1018 insertions, 0 deletions
diff --git a/secure/usr.bin/bdes/bdes.c b/secure/usr.bin/bdes/bdes.c new file mode 100644 index 0000000..8efa179 --- /dev/null +++ b/secure/usr.bin/bdes/bdes.c @@ -0,0 +1,1018 @@ +/*- + * 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 const 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"; +#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 <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/types.h> + +#include <ctype.h> +#include <err.h> +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include <openssl/des.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)) + +#define DES_XFORM(buf) \ + DES_ecb_encrypt(buf, buf, &schedule, \ + mode == MODE_ENCRYPT ? DES_ENCRYPT : DES_DECRYPT); + +/* + * 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) \ + warnx("fwrite error at %d", n); + +/* + * 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; + +DES_cblock 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 */ + +DES_key_schedule schedule; /* expanded DES key */ + +static void ecbenc(void); +static void ecbdec(void); +static void cbcenc(void); +static void cbcdec(void); +static void cfbenc(void); +static void cfbdec(void); +static void cfbaenc(void); +static void cfbadec(void); +static void ofbenc(void); +static void ofbdec(void); + +static void cbcauth(void); +static void cfbauth(void); + +static void cvtkey(DES_cblock, char *); +static int setbits(char *, int); +static void makekey(DES_cblock *); +static int tobinhex(char, int); + +static void usage(void); + +int +main(int ac, char *av[]) +{ + extern char *optarg; /* argument to option if any */ + int i; /* counter in a for loop */ + char *p; /* used to obtain the key */ + DES_cblock 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) + errx(1, "-F: number must be 1-56 inclusive"); + else if (fbbits == -1) + errx(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) + errx(1, "-f: number must be 1-64 inclusive"); + else if (fbbits == -1) + errx(1, "-f: number must be a multiple of 8"); + break; + case 'k': /* encryption key */ + kflag = 1; + cvtkey(msgbuf, optarg); + break; + case 'm': /* number of bits for MACing */ + mode = MODE_AUTHENTICATE; + if ((macbits = setbits(optarg, 1)) > 64) + errx(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) + errx(1, "-o: number must be 1-64 inclusive"); + else if (fbbits == -1) + errx(1, "-o: number must be a multiple of 8"); + break; + case 'p': /* preserve parity bits */ + pflag = 1; + break; + case 'v': /* set initialization vector */ + cvtkey(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(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 */ + errx(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 */ + errx(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 */ + errx(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; + } + return (0); +} + +/* + * map a hex character to an integer + */ +static int +tobinhex(char c, int radix) +{ + 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 + */ +static void +cvtkey(DES_cblock obuf, char *ibuf) +{ + 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) + warnx("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) + warnx("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 + */ +static int +setbits(char *s, int mult) +{ + char *p; /* pointer in a for loop */ + 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 { + warnx("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. + */ +static void +makekey(DES_cblock *buf) +{ + int i, j; /* counter in a for loop */ + 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] & (*buf)[i]) != 0) + par++; + if ((par & 0x01) == 0x01) + (*buf)[i] &= 0x7f; + else + (*buf)[i] = ((*buf)[i] & 0x7f) | 0x80; + } + } + + DES_set_odd_parity(buf); + DES_set_key(buf, &schedule); +} + +/* + * This encrypts using the Electronic Code Book mode of DES + */ +static void +ecbenc(void) +{ + int n; /* number of bytes actually read */ + int bn; /* block number */ + DES_cblock msgbuf; /* I/O buffer */ + + for (bn = 0; (n = READ(msgbuf, 8)) == 8; bn++) { + /* + * do the transformation + */ + DES_XFORM(&msgbuf); + WRITE(&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(&msgbuf[n], 8 - n); + msgbuf[7] = n; + DES_XFORM(&msgbuf); + WRITE(&msgbuf, 8); + +} + +/* + * This decrypts using the Electronic Code Book mode of DES + */ +static void +ecbdec(void) +{ + int n; /* number of bytes actually read */ + int c; /* used to test for EOF */ + int bn; /* block number */ + DES_cblock msgbuf; /* I/O buffer */ + + for (bn = 1; (n = READ(msgbuf, 8)) == 8; bn++) { + /* + * do the transformation + */ + DES_XFORM(&msgbuf); + /* + * if the last one, handle it specially + */ + if ((c = getchar()) == EOF) { + n = msgbuf[7]; + if (n < 0 || n > 7) + warnx("decryption failed (block corrupt) at %d", + bn); + } + else + (void)ungetc(c, stdin); + WRITE(msgbuf, n); + } + if (n > 0) + warnx("decryption failed (incomplete block) at %d", bn); +} + +/* + * This encrypts using the Cipher Block Chaining mode of DES + */ +static void +cbcenc(void) +{ + int n; /* number of bytes actually read */ + int bn; /* block number */ + DES_cblock msgbuf; /* I/O buffer */ + + /* + * do the transformation + */ + for (bn = 1; (n = READ(msgbuf, 8)) == 8; bn++) { + for (n = 0; n < 8; n++) + msgbuf[n] ^= ivec[n]; + DES_XFORM(&msgbuf); + MEMCPY(ivec, msgbuf, 8); + WRITE(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(&msgbuf[n], 8 - n); + msgbuf[7] = n; + for (n = 0; n < 8; n++) + msgbuf[n] ^= ivec[n]; + DES_XFORM(&msgbuf); + WRITE(msgbuf, 8); + +} + +/* + * This decrypts using the Cipher Block Chaining mode of DES + */ +static void +cbcdec(void) +{ + int n; /* number of bytes actually read */ + DES_cblock msgbuf; /* I/O buffer */ + DES_cblock ibuf; /* temp buffer for initialization vector */ + int c; /* used to test for EOF */ + int bn; /* block number */ + + for (bn = 0; (n = READ(msgbuf, 8)) == 8; bn++) { + /* + * do the transformation + */ + MEMCPY(ibuf, msgbuf, 8); + DES_XFORM(&msgbuf); + for (c = 0; c < 8; c++) + msgbuf[c] ^= ivec[c]; + MEMCPY(ivec, ibuf, 8); + /* + * if the last one, handle it specially + */ + if ((c = getchar()) == EOF) { + n = msgbuf[7]; + if (n < 0 || n > 7) + warnx("decryption failed (block corrupt) at %d", + bn); + } + else + (void)ungetc(c, stdin); + WRITE(msgbuf, n); + } + if (n > 0) + warnx("decryption failed (incomplete block) at %d", bn); +} + +/* + * This authenticates using the Cipher Block Chaining mode of DES + */ +static void +cbcauth(void) +{ + int n, j; /* number of bytes actually read */ + DES_cblock msgbuf; /* I/O buffer */ + DES_cblock encbuf; /* encryption buffer */ + + /* + * do the transformation + * note we DISCARD the encrypted block; + * we only care about the last one + */ + while ((n = READ(msgbuf, 8)) == 8) { + for (n = 0; n < 8; n++) + encbuf[n] = msgbuf[n] ^ ivec[n]; + DES_XFORM(&encbuf); + MEMCPY(ivec, encbuf, 8); + } + /* + * now compute the last one, right padding with '\0' if need be + */ + if (n > 0) { + MEMZERO(&msgbuf[n], 8 - n); + for (n = 0; n < 8; n++) + encbuf[n] = msgbuf[n] ^ ivec[n]; + DES_XFORM(&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(encbuf[n]); + if (macbits > 0) { + msgbuf[0] = 0x00; + for (j = 0; j < macbits; j++) + msgbuf[0] |= encbuf[n] & bits[j]; + (void)putchar(msgbuf[0]); + } +} + +/* + * This encrypts using the Cipher FeedBack mode of DES + */ +static void +cfbenc(void) +{ + int n; /* number of bytes actually read */ + int nbytes; /* number of bytes to read */ + int bn; /* block number */ + char ibuf[8]; /* input buffer */ + DES_cblock 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(msgbuf, ivec, 8); + DES_XFORM(&msgbuf); + for (n = 0; n < 8 - nbytes; n++) + ivec[n] = ivec[n+nbytes]; + for (n = 0; n < nbytes; n++) + ivec[8 - nbytes + n] = ibuf[n] ^ msgbuf[n]; + WRITE(&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(msgbuf, ivec, 8); + DES_XFORM(&msgbuf); + for (n = 0; n < nbytes; n++) + ibuf[n] ^= msgbuf[n]; + WRITE(ibuf, nbytes); +} + +/* + * This decrypts using the Cipher Block Chaining mode of DES + */ +static void +cfbdec(void) +{ + int n; /* number of bytes actually read */ + int c; /* used to test for EOF */ + int nbytes; /* number of bytes to read */ + int bn; /* block number */ + char ibuf[8]; /* input buffer */ + char obuf[8]; /* output buffer */ + DES_cblock 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(msgbuf, ivec, 8); + DES_XFORM(&msgbuf); + for (c = 0; c < 8 - nbytes; c++) + ivec[c] = ivec[c + nbytes]; + for (c = 0; c < nbytes; c++) { + ivec[8 - nbytes + c] = ibuf[c]; + obuf[c] = ibuf[c] ^ msgbuf[c]; + } + /* + * if the last one, handle it specially + */ + if ((c = getchar()) == EOF) { + n = obuf[nbytes-1]; + if (n < 0 || n > nbytes-1) + warnx("decryption failed (block corrupt) at %d", + bn); + } + else + (void)ungetc(c, stdin); + WRITE(obuf, n); + } + if (n > 0) + warnx("decryption failed (incomplete block) at %d", bn); +} + +/* + * This encrypts using the alternative Cipher FeedBack mode of DES + */ +static void +cfbaenc(void) +{ + int n; /* number of bytes actually read */ + int nbytes; /* number of bytes to read */ + int bn; /* block number */ + char ibuf[8]; /* input buffer */ + char obuf[8]; /* output buffer */ + DES_cblock 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(msgbuf, ivec, 8); + DES_XFORM(&msgbuf); + for (n = 0; n < 8 - nbytes; n++) + ivec[n] = ivec[n + nbytes]; + for (n = 0; n < nbytes; n++) + ivec[8 - nbytes + n] = (ibuf[n] ^ msgbuf[n]) | 0x80; + for (n = 0; n < nbytes; n++) + obuf[n] = ivec[8 - nbytes + n] & 0x7f; + 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(msgbuf, ivec, 8); + DES_XFORM(&msgbuf); + for (n = 0; n < nbytes; n++) + ibuf[n] ^= msgbuf[n]; + WRITE(ibuf, nbytes); +} + +/* + * This decrypts using the alternative Cipher Block Chaining mode of DES + */ +static void +cfbadec(void) +{ + int n; /* number of bytes actually read */ + int c; /* used to test for EOF */ + int nbytes; /* number of bytes to read */ + int bn; /* block number */ + char ibuf[8]; /* input buffer */ + char obuf[8]; /* output buffer */ + DES_cblock 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(msgbuf, ivec, 8); + DES_XFORM(&msgbuf); + for (c = 0; c < 8 - nbytes; c++) + ivec[c] = ivec[c + nbytes]; + for (c = 0; c < nbytes; c++) { + ivec[8 - nbytes + c] = ibuf[c] | 0x80; + obuf[c] = (ibuf[c] ^ msgbuf[c]) & 0x7f; + } + /* + * if the last one, handle it specially + */ + if ((c = getchar()) == EOF) { + if ((n = (obuf[nbytes-1] - '0')) < 0 + || n > nbytes-1) + warnx("decryption failed (block corrupt) at %d", + bn); + } + else + (void)ungetc(c, stdin); + WRITE(obuf, n); + } + if (n > 0) + warnx("decryption failed (incomplete block) at %d", bn); +} + + +/* + * This encrypts using the Output FeedBack mode of DES + */ +static void +ofbenc(void) +{ + int n; /* number of bytes actually read */ + int c; /* used to test for EOF */ + int nbytes; /* number of bytes to read */ + int bn; /* block number */ + char ibuf[8]; /* input buffer */ + char obuf[8]; /* output buffer */ + DES_cblock 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(msgbuf, ivec, 8); + DES_XFORM(&msgbuf); + for (n = 0; n < 8 - nbytes; n++) + ivec[n] = ivec[n + nbytes]; + for (n = 0; n < nbytes; n++) { + ivec[8 - nbytes + n] = msgbuf[n]; + obuf[n] = ibuf[n] ^ 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(msgbuf, ivec, 8); + DES_XFORM(&msgbuf); + for (c = 0; c < nbytes; c++) + ibuf[c] ^= msgbuf[c]; + WRITE(ibuf, nbytes); +} + +/* + * This decrypts using the Output Block Chaining mode of DES + */ +static void +ofbdec(void) +{ + int n; /* number of bytes actually read */ + int c; /* used to test for EOF */ + int nbytes; /* number of bytes to read */ + int bn; /* block number */ + char ibuf[8]; /* input buffer */ + char obuf[8]; /* output buffer */ + DES_cblock 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(msgbuf, ivec, 8); + DES_XFORM(&msgbuf); + for (c = 0; c < 8 - nbytes; c++) + ivec[c] = ivec[c + nbytes]; + for (c = 0; c < nbytes; c++) { + ivec[8 - nbytes + c] = msgbuf[c]; + obuf[c] = ibuf[c] ^ msgbuf[c]; + } + /* + * if the last one, handle it specially + */ + if ((c = getchar()) == EOF) { + n = obuf[nbytes-1]; + if (n < 0 || n > nbytes-1) + warnx("decryption failed (block corrupt) at %d", + bn); + } + else + (void)ungetc(c, stdin); + /* + * dump it + */ + WRITE(obuf, n); + } + if (n > 0) + warnx("decryption failed (incomplete block) at %d", bn); +} + +/* + * This authenticates using the Cipher FeedBack mode of DES + */ +static void +cfbauth(void) +{ + int n, j; /* number of bytes actually read */ + int nbytes; /* number of bytes to read */ + char ibuf[8]; /* input buffer */ + DES_cblock msgbuf; /* encryption buffer */ + + /* + * do things in bytes, not bits + */ + nbytes = fbbits / 8; + /* + * do the transformation + */ + while ((n = READ(ibuf, nbytes)) == nbytes) { + MEMCPY(msgbuf, ivec, 8); + DES_XFORM(&msgbuf); + for (n = 0; n < 8 - nbytes; n++) + ivec[n] = ivec[n + nbytes]; + for (n = 0; n < nbytes; n++) + ivec[8 - nbytes + n] = ibuf[n] ^ 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(msgbuf, ivec, 8); + DES_XFORM(&msgbuf); + for (n = 0; n < nbytes; n++) + ibuf[n] ^= 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(msgbuf[n]); + if (macbits > 0) { + msgbuf[0] = 0x00; + for (j = 0; j < macbits; j++) + msgbuf[0] |= msgbuf[n] & bits[j]; + (void)putchar(msgbuf[0]); + } +} + +/* + * message about usage + */ +static void +usage(void) +{ + (void)fprintf(stderr, "%s\n", +"usage: bdes [-abdp] [-F bit] [-f bit] [-k key] [-m bit] [-o bit] [-v vector]"); + exit(1); +} |
