/* lib/des/ofb64enc.c */
/* Copyright (C) 1995 Eric Young (eay@mincom.oz.au)
 * All rights reserved.
 * 
 * This file is part of an SSL implementation written
 * by Eric Young (eay@mincom.oz.au).
 * 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 (eay@mincom.oz.au)
 * 
 * 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 "des_locl.h"

/* The input and output encrypted as though 64bit ofb mode is being
 * used.  The extra state information to record how much of the
 * 64bit block we have used is contained in *num;
 */
void des_ede3_ofb64_encrypt(in, out, length, k1,k2,k3, ivec, num)
register unsigned char *in;
register unsigned char *out;
long length;
des_key_schedule k1,k2,k3;
des_cblock (*ivec);
int *num;
		{
		register unsigned long v0,v1;
		register int n=*num;
		register long l=length;
		des_cblock d;
		register char *dp;
		unsigned long ti[2];
		unsigned char *iv;
		int save=0;

		iv=(unsigned char *)ivec;
		c2l(iv,v0);
		c2l(iv,v1);
		ti[0]=v0;
		ti[1]=v1;
		dp=(char *)d;
		l2c(v0,dp);
		l2c(v1,dp);
		while (l--)
				{
				if (n == 0)
						{
						IP(v0,v1);

						ti[0]=v0;
						ti[1]=v1;
						des_encrypt2((unsigned long *)ti,k1,DES_ENCRYPT);
						des_encrypt2((unsigned long *)ti,k2,DES_DECRYPT);
						des_encrypt2((unsigned long *)ti,k3,DES_ENCRYPT);
						v0=ti[0];
						v1=ti[1];

						FP(v1,v0);

						dp=(char *)d;
						l2c(v0,dp);
						l2c(v1,dp);
						save++;
						}
				*(out++)=*(in++)^d[n];
				n=(n+1)&0x07;
				}
		if (save)
				{
/*				v0=ti[0];
				v1=ti[1];*/
				iv=(unsigned char *)ivec;
				l2c(v0,iv);
				l2c(v1,iv);
				}
		v0=v1=ti[0]=ti[1]=0;
		*num=n;
		}

#ifdef undef /* MACRO */
void des_ede2_ofb64_encrypt(in, out, length, k1,k2, ivec, num)
register unsigned char *in;
register unsigned char *out;
long length;
des_key_schedule k1,k2;
des_cblock (*ivec);
int *num;
		{
		des_ede3_ofb64_encrypt(in, out, length, k1,k2,k1, ivec, num);
		}
#endif