1 files changed, 402 insertions, 0 deletions
diff --git a/text_cmds/ed/cbc.c b/text_cmds/ed/cbc.c
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+/* 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.
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: src/bin/ed/cbc.c,v 1.20 2004/04/06 20:06:47 markm Exp $");
+
+#include <sys/types.h>
+#include <errno.h>
+#include <pwd.h>
+#ifdef DES
+#include <time.h>
+#include <openssl/des.h>
+#define ED_DES_INCLUDES
+#endif
+
+#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_XFORM(buf)							\
+		DES_ecb_encrypt(buf, buf, &schedule, 			\
+		    inverse ? DES_DECRYPT : DES_ENCRYPT);
+
+/*
+ * 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)
+
+/*
+ * global variables and related macros
+ */
+
+enum { 					/* encrypt, decrypt, authenticate */
+	MODE_ENCRYPT, MODE_DECRYPT, MODE_AUTHENTICATE
+} mode = MODE_ENCRYPT;
+
+#ifdef DES
+DES_cblock ivec;			/* initialization vector */
+DES_cblock pvec;			/* padding vector */
+#endif
+
+char bits[] = {				/* used to extract bits from a char */
+	'\200', '\100', '\040', '\020', '\010', '\004', '\002', '\001'
+};
+
+int pflag;				/* 1 to preserve parity bits */
+
+#ifdef DES
+DES_key_schedule schedule;		/* expanded DES key */
+#endif
+
+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);
+
+	/* initialize the padding vector */
+	for (i = 0; i < 8; i++)
+		pvec[i] = (char) (arc4random() % 256);
+#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(des_buf, fp);
+	}
+	return (des_ct > 0) ? des_buf[des_n++] : EOF;
+#else
+	return (getc(fp));
+#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(des_buf, des_n, fp);
+		des_n = 0;
+	}
+	return (des_ct >= 0) ? (des_buf[des_n++] = c) : EOF;
+#else
+	return (fputc(c, fp));
+#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(des_buf, des_n, fp);
+		des_n = 0;
+	}
+	return (des_ct >= 0 && cbc_encode(des_buf, des_n, fp) >= 0) ? 0 : EOF;
+#else
+	return (fflush(fp));
+#endif
+}
+
+#ifdef DES
+/*
+ * get keyword from tty or stdin
+ */
+int
+get_keyword(void)
+{
+	char *p;			/* used to obtain the key */
+	DES_cblock msgbuf;		/* I/O buffer */
+
+	/*
+	 * get the key
+	 */
+	if (*(p = getpass("Enter key: "))) {
+
+		/*
+		 * copy it, nul-padded, into the key area
+		 */
+		expand_des_key(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(const char *s)
+{
+	errmsg = 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
+ *	obuf		bit pattern
+ *	kbuf		the key itself
+ */
+void
+expand_des_key(char *obuf, char *kbuf)
+{
+	int i, j;			/* counter in a for loop */
+	int nbuf[64];			/* used for hex/key translation */
+
+	/*
+	 * leading '0x' or '0X' == hex key
+	 */
+	if (kbuf[0] == '0' && (kbuf[1] == 'x' || kbuf[1] == 'X')) {
+		kbuf = &kbuf[2];
+		/*
+		 * now translate it, bombing on any illegal hex digit
+		 */
+		for (i = 0; kbuf[i] && i < 16; i++)
+			if ((nbuf[i] = hex_to_binary((int) kbuf[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 (kbuf[0] == '0' && (kbuf[1] == 'b' || kbuf[1] == 'B')) {
+		kbuf = &kbuf[2];
+		/*
+		 * now translate it, bombing on any illegal binary digit
+		 */
+		for (i = 0; kbuf[i] && i < 16; i++)
+			if ((nbuf[i] = hex_to_binary((int) kbuf[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
+	 */
+	(void)strncpy(obuf, kbuf, 8);
+}
+
+/*****************
+ * 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(DES_cblock *buf)			/* key block */
+{
+	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 Cipher Block Chaining mode of DES
+ */
+int
+cbc_encode(unsigned 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++)
+			msgbuf[n] ^= ivec[n];
+		DES_XFORM((DES_cblock *)msgbuf);
+		MEMCPY(ivec, msgbuf, 8);
+		return WRITE(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(msgbuf + n, pvec, 8 - n);
+	msgbuf[7] = n;
+	for (n = 0; n < 8; n++)
+		msgbuf[n] ^= ivec[n];
+	DES_XFORM((DES_cblock *)msgbuf);
+	return WRITE(msgbuf, 8, fp);
+}
+
+/*
+ * This decrypts using the Cipher Block Chaining mode of DES
+ *	msgbuf	I/O buffer
+ *	fp	input file descriptor
+ */
+int
+cbc_decode(unsigned char *msgbuf, FILE *fp)
+{
+	DES_cblock tbuf;	/* 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(msgbuf, 8, fp)) == 8) {
+		/*
+		 * do the transformation
+		 */
+		MEMCPY(tbuf, msgbuf, 8);
+		DES_XFORM((DES_cblock *)msgbuf);
+		for (c = 0; c < 8; c++)
+			msgbuf[c] ^= ivec[c];
+		MEMCPY(ivec, tbuf, 8);
+		/*
+		 * if the last one, handle it specially
+		 */
+		if ((c = fgetc(fp)) == EOF) {
+			n = 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 */