/*-
 * 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	2.2 88/08/10 4.0 RPCSRC; from 1.13 88/02/08 SMI
 * $FreeBSD: src/lib/libc/rpc/des_crypt.c,v 1.3 1999/08/28 00:00:38 peter Exp $
 */
/*
 * des_crypt.c, DES encryption library routines
 * Copyright (C) 1986, Sun Microsystems, Inc.
 */

#include <sys/types.h>
#include <rpc/des_crypt.h>
#include <rpc/des.h>

static int common_crypt	( char *, char *, unsigned, unsigned, struct desparams * );
int (*__des_crypt_LOCAL)(char *, int, struct desparams *) = NULL;
extern int _des_crypt_call( char *, int, 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(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(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(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_LOCAL != NULL) {
		if (!__des_crypt_LOCAL(buf, len, desp)) {
			return (DESERR_HWERROR);
		}
	} else {
		if (!_des_crypt_call(buf, len, desp)) {
			return (DESERR_HWERROR);
		}
	}
	return(desdev == DES_SW ? DESERR_NONE : DESERR_NOHWDEVICE);
}