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Diffstat (limited to 'bin/ed/cbc.c')
| -rw-r--r-- | bin/ed/cbc.c | 389 |
1 files changed, 0 insertions, 389 deletions
diff --git a/bin/ed/cbc.c b/bin/ed/cbc.c deleted file mode 100644 index da1304799a8..00000000000 --- a/bin/ed/cbc.c +++ /dev/null @@ -1,389 +0,0 @@ -/* $OpenBSD: cbc.c,v 1.16 2009/10/27 23:59:21 deraadt Exp $ */ -/* $NetBSD: cbc.c,v 1.9 1995/03/21 09:04:36 cgd Exp $ */ - -/* cbc.c: This file contains the encryption routines for the ed line editor */ -/*- - * Copyright (c) 1993 The Regents of the University of California. - * All rights reserved. - * - * Copyright (c) 1993 Andrew Moore, Talke Studio. - * All rights reserved. - * - * 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. 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. - * - * from: @(#)bdes.c 5.5 (Berkeley) 6/27/91 - */ - -#include <sys/types.h> -#include <ctype.h> -#include <errno.h> -#include <pwd.h> - -#include "ed.h" - - -/* - * BSD and System V systems offer special library calls that do - * block move_liness and fills, so if possible we take advantage of them - */ -#define MEMCPY(dest,src,len) memcpy((dest),(src),(len)) -#define MEMZERO(dest,len) memset((dest), 0, (len)) - -/* Hide the calls to the primitive encryption routines. */ -#define DES_KEY(buf) \ - if (des_setkey(buf)) \ - des_error("des_setkey"); -#define DES_XFORM(buf) \ - if (des_cipher(buf, buf, 0L, (inverse ? -1 : 1))) \ - des_error("des_cipher"); - -/* - * read/write - no error checking - */ -#define READ(buf, n, fp) fread(buf, sizeof(char), n, fp) -#define WRITE(buf, n, fp) fwrite(buf, sizeof(char), n, fp) - -/* - * 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 - */ - -Desbuf ivec; /* initialization vector */ -Desbuf pvec; /* padding vector */ -char bits[] = { /* used to extract bits from a char */ - '\200', '\100', '\040', '\020', '\010', '\004', '\002', '\001' -}; -int pflag; /* 1 to preserve parity bits */ - -unsigned char des_buf[8]; /* shared buffer for get_des_char/put_des_char */ -int des_ct = 0; /* count for get_des_char/put_des_char */ -int des_n = 0; /* index for put_des_char/get_des_char */ - - -/* init_des_cipher: initialize DES */ -void -init_des_cipher(void) -{ -#ifdef DES - int i; - - des_ct = des_n = 0; - - /* initialize the initialization vector */ - MEMZERO(ivec, 8); - - for (i = 0; i < 8; i++) - CHAR(pvec, i) = (char) arc4random(); -#endif -} - - -/* get_des_char: return next char in an encrypted file */ -int -get_des_char(FILE *fp) -{ -#ifdef DES - if (des_n >= des_ct) { - des_n = 0; - des_ct = cbc_decode((char *)des_buf, fp); - } - return (des_ct > 0) ? des_buf[des_n++] : EOF; -#endif -} - - -/* put_des_char: write a char to an encrypted file; return char written */ -int -put_des_char(int c, FILE *fp) -{ -#ifdef DES - if (des_n == sizeof des_buf) { - des_ct = cbc_encode((char *)des_buf, des_n, fp); - des_n = 0; - } - return (des_ct >= 0) ? (des_buf[des_n++] = c) : EOF; -#endif -} - - -/* flush_des_file: flush an encrypted file's output; return status */ -int -flush_des_file(FILE *fp) -{ -#ifdef DES - if (des_n == sizeof des_buf) { - des_ct = cbc_encode((char *)des_buf, des_n, fp); - des_n = 0; - } - return (des_ct >= 0 && cbc_encode((char *)des_buf, des_n, fp) >= 0) ? 0 : EOF; -#endif -} - -#ifdef DES -/* - * get keyword from tty or stdin - */ -int -get_keyword(void) -{ - char *p; /* used to obtain the key */ - Desbuf msgbuf; /* I/O buffer */ - - /* - * get the key - */ - if ((p = getpass("Enter key: ")) != NULL && *p != '\0') { - - /* - * copy it, nul-padded, into the key area - */ - expand_des_key(BUFFER(msgbuf), p); - MEMZERO(p, _PASSWORD_LEN); - set_des_key(msgbuf); - MEMZERO(msgbuf, sizeof msgbuf); - return 1; - } - return 0; -} - - -/* - * print a warning message and, possibly, terminate - */ -void -des_error(char *s) -{ - seterrmsg(s ? s : strerror(errno)); -} - -/* - * map a hex character to an integer - */ -int -hex_to_binary(int 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 - */ -void -expand_des_key(char *obuf, char *ibuf) -{ - int i, j; /* counter in a for loop */ - int nbuf[64]; /* used for hex/key translation */ - - /* - * 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] = hex_to_binary((int) ibuf[i], 16)) == -1) - des_error("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] = hex_to_binary((int) ibuf[i], 2)) == -1) - des_error("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 - */ - strncpy(obuf, ibuf, 8); /* XXX ? */ -} - -/***************** - * 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. - */ -void -set_des_key(Desbuf 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]&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 Cipher Block Chaining mode of DES - */ -int -cbc_encode(char *msgbuf, int n, FILE *fp) -{ - int inverse = 0; /* 0 to encrypt, 1 to decrypt */ - - /* - * do the transformation - */ - if (n == 8) { - for (n = 0; n < 8; n++) - CHAR(msgbuf, n) ^= CHAR(ivec, n); - DES_XFORM(UBUFFER(msgbuf)); - MEMCPY(BUFFER(ivec), BUFFER(msgbuf), 8); - return WRITE(BUFFER(msgbuf), 8, fp); - } - /* - * at EOF or last block -- in either case, the last byte contains - * the character representation of the number of bytes in it - */ -/* - MEMZERO(msgbuf + n, 8 - n); -*/ - /* - * Pad the last block randomly - */ - (void)MEMCPY(BUFFER(msgbuf + n), BUFFER(pvec), 8 - n); - CHAR(msgbuf, 7) = n; - for (n = 0; n < 8; n++) - CHAR(msgbuf, n) ^= CHAR(ivec, n); - DES_XFORM(UBUFFER(msgbuf)); - return WRITE(BUFFER(msgbuf), 8, fp); -} - -/* - * This decrypts using the Cipher Block Chaining mode of DES - */ -int -cbc_decode(char *msgbuf, FILE *fp) -{ - Desbuf ibuf; /* temp buffer for initialization vector */ - int n; /* number of bytes actually read */ - int c; /* used to test for EOF */ - int inverse = 1; /* 0 to encrypt, 1 to decrypt */ - - if ((n = READ(BUFFER(msgbuf), 8, fp)) == 8) { - /* - * 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 = fgetc(fp)) == EOF) { - n = CHAR(msgbuf, 7); - if (n < 0 || n > 7) { - des_error("decryption failed (block corrupted)"); - return EOF; - } - } else - (void)ungetc(c, fp); - return n; - } - if (n > 0) - des_error("decryption failed (incomplete block)"); - else if (n < 0) - des_error("cannot read file"); - return EOF; -} -#endif /* DES */ |