/*

 * Copyright (c) 2009, Sun Microsystems, Inc.

 * All rights reserved.

 *

 * 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.

 */

/*

 * des_crypt.c, DES encryption library routines

 * Copyright (C) 1986, Sun Microsystems, Inc.

 */

#include <sys/types.h>

#include <rpc/types.h>

#include <rpc/des_crypt.h>

#include <rpc/des.h>

#if 0

#ifndef lint

static char sccsid[] = "@(#)des_crypt.c	2.2 88/08/10 4.0 RPCSRC; from 1.13 88/02/08 SMI";

#endif

#endif

static int common_crypt( char *, char *, unsigned, unsigned, struct desparams * );

/*

 * Copy 8 bytes

 */

#define COPY8(src, dst) { \

	char *a = (char *) dst; \

	char *b = (char *) src; \

	*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \

	*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \

}

/*

 * Copy multiple of 8 bytes

 */

#define DESCOPY(src, dst, len) { \

	char *a = (char *) dst; \

	char *b = (char *) src; \

	int i; \

	for (i = (int) len; i > 0; i -= 8) { \

		*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \

		*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \

	} \

}

/*

 * CBC mode encryption

 */

int

cbc_crypt(key, buf, len, mode, ivec)

	char *key;

	char *buf;

	unsigned len;

	unsigned mode;

	char *ivec;

{

	int err;

	struct desparams dp;

#ifdef BROKEN_DES

	dp.UDES.UDES_buf = buf;

	dp.des_mode = ECB;

#else

	dp.des_mode = CBC;

#endif

	COPY8(ivec, dp.des_ivec);

	err = common_crypt(key, buf, len, mode, &dp;;

	COPY8(dp.des_ivec, ivec);

	return(err);

}

/*

 * ECB mode encryption

 */

int

ecb_crypt(key, buf, len, mode)

	char *key;

	char *buf;

	unsigned len;

	unsigned mode;

{

	struct desparams dp;

#ifdef BROKEN_DES

	dp.UDES.UDES_buf = buf;

	dp.des_mode = CBC;

#else

	dp.des_mode = ECB;

#endif

	return(common_crypt(key, buf, len, mode, &dp));

}

/*

 * Common code to cbc_crypt() & ecb_crypt()

 */

static int

common_crypt(key, buf, len, mode, desp)

	char *key;

	char *buf;

	unsigned len;

	unsigned mode;

	struct desparams *desp;

{

	int desdev;

	if ((len % 8) != 0 || len > DES_MAXDATA) {

		return(DESERR_BADPARAM);

	}

	desp->des_dir =

		((mode & DES_DIRMASK) == DES_ENCRYPT) ? ENCRYPT : DECRYPT;

	desdev = mode & DES_DEVMASK;

	COPY8(key, desp->des_key);

	/*

	 * software

	 */

	if (!_des_crypt(buf, len, desp)) {

	        return (DESERR_HWERROR);

	}

	return(desdev == DES_SW ? DESERR_NONE : DESERR_NOHWDEVICE);

}