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/*
* Copyright (c) 1986-1991 by Sun Microsystems Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Sun Microsystems, Inc. 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 COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDER 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.
*/
#if 0
#ident "@(#)xcrypt.c 1.11 94/08/23 SMI"
#endif
#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)xcrypt.c 1.3 89/03/24 Copyr 1986 Sun Micro";
#endif
/*
* xcrypt.c: Hex encryption/decryption and utility routines
*/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <rpc/des_crypt.h>
static const char hex[16] =
{
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
};
#ifdef _LIBC
# define hexval(c) \
(c >= '0' && c <= '9' \
? c - '0' \
: ({ int upp = toupper (c); \
upp >= 'A' && upp <= 'Z' ? upp - 'A' + 10 : -1; }))
#else
static char hexval (char) internal_function;
#endif
static void hex2bin (int, char *, char *) internal_function;
static void bin2hex (int, unsigned char *, char *) internal_function;
void passwd2des_internal (char *pw, char *key);
#ifdef _LIBC
libc_hidden_proto (passwd2des_internal)
#endif
/*
* Turn password into DES key
*/
void
passwd2des_internal (char *pw, char *key)
{
int i;
memset (key, 0, 8);
for (i = 0; *pw && i < 8; ++i)
key[i] ^= *pw++ << 1;
des_setparity (key);
}
#ifdef _LIBC
libc_hidden_def (passwd2des_internal)
strong_alias (passwd2des_internal, passwd2des)
#else
void passwd2des (char *pw, char *key)
{
return passwd2des_internal (pw, key);
}
#endif
/*
* Encrypt a secret key given passwd
* The secret key is passed and returned in hex notation.
* Its length must be a multiple of 16 hex digits (64 bits).
*/
int
xencrypt (char *secret, char *passwd)
{
char key[8];
char ivec[8];
char *buf;
int err;
int len;
len = strlen (secret) / 2;
buf = malloc ((unsigned) len);
hex2bin (len, secret, buf);
passwd2des_internal (passwd, key);
memset (ivec, 0, 8);
err = cbc_crypt (key, buf, len, DES_ENCRYPT | DES_HW, ivec);
if (DES_FAILED (err))
{
free (buf);
return 0;
}
bin2hex (len, (unsigned char *) buf, secret);
free (buf);
return 1;
}
/*
* Decrypt secret key using passwd
* The secret key is passed and returned in hex notation.
* Once again, the length is a multiple of 16 hex digits
*/
int
xdecrypt (char *secret, char *passwd)
{
char key[8];
char ivec[8];
char *buf;
int err;
int len;
len = strlen (secret) / 2;
buf = malloc ((unsigned) len);
hex2bin (len, secret, buf);
passwd2des_internal (passwd, key);
memset (ivec, 0, 8);
err = cbc_crypt (key, buf, len, DES_DECRYPT | DES_HW, ivec);
if (DES_FAILED (err))
{
free (buf);
return 0;
}
bin2hex (len, (unsigned char *) buf, secret);
free (buf);
return 1;
}
/*
* Hex to binary conversion
*/
static void
internal_function
hex2bin (int len, char *hexnum, char *binnum)
{
int i;
for (i = 0; i < len; i++)
*binnum++ = 16 * hexval (hexnum[2 * i]) + hexval (hexnum[2 * i + 1]);
}
/*
* Binary to hex conversion
*/
static void
internal_function
bin2hex (int len, unsigned char *binnum, char *hexnum)
{
int i;
unsigned val;
for (i = 0; i < len; i++)
{
val = binnum[i];
hexnum[i * 2] = hex[val >> 4];
hexnum[i * 2 + 1] = hex[val & 0xf];
}
hexnum[len * 2] = 0;
}
#ifndef _LIBC
static char
hexval (char c)
{
if (c >= '0' && c <= '9')
return (c - '0');
else if (c >= 'a' && c <= 'z')
return (c - 'a' + 10);
else if (c >= 'A' && c <= 'Z')
return (c - 'A' + 10);
else
return -1;
}
#endif
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