rpc_enc.c

IP网络语音通讯软件源代码. 不可多得的语音源代码

/* lib/des/rpc_enc.c */
/* Copyright (C) 1995 Eric Young ([e-mail])
 * All rights reserved.
 * 
 * This file is part of an SSL implementation written
 * by Eric Young ([e-mail]).
 * The implementation was written so as to conform with Netscapes SSL
 * specification.  This library and applications are
 * FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
 * as long as the following conditions are aheared to.
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.	If this code is used in a product,
 * Eric Young should be given attribution as the author of the parts used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * 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 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. All advertising materials mentioning features or use of this software
 *	  must display the following acknowledgement:
 *	  This product includes software developed by Eric Young ([e-mail])
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR 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.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include "rpc_des.h"
#include "des_locl.h"
#include "version.h"

#ifdef PROTO
int _des_crypt(char *buf,int len,struct desparams *desp);
#else
int _des_crypt();
#endif

int _des_crypt(buf, len, desp)
char *buf;
int len;
struct desparams *desp;
		{
		Key_schedule ks;
		int enc;

		des_set_key((des_cblock *)desp->des_key,ks);
		enc=(desp->des_dir == ENCRYPT)?DES_ENCRYPT:DES_DECRYPT;

		if (desp->des_mode == CBC)
				des_ecb_encrypt((des_cblock *)desp->UDES.UDES_buf,
								(des_cblock *)desp->UDES.UDES_buf,ks,enc);
		else
				{
				des_ncbc_encrypt((des_cblock *)desp->UDES.UDES_buf,
								(des_cblock *)desp->UDES.UDES_buf,
								(long)len,ks,
								(des_cblock *)desp->des_ivec,enc);
#ifdef undef
				/* len will always be %8 if called from common_crypt
				 * in secure_rpc.
                 * Libdes's cbc encrypt does not copy back the iv,
				 * so we have to do it here. */
				/* It does now :-) eay 20/09/95 */

				a=(char *)&(desp->UDES.UDES_buf[len-8]);
				b=(char *)&(desp->des_ivec[0]);

				*(a++)= *(b++); *(a++)= *(b++);
				*(a++)= *(b++); *(a++)= *(b++);
				*(a++)= *(b++); *(a++)= *(b++);
				*(a++)= *(b++); *(a++)= *(b++);
#endif
				}
		return(1);		
		}