ede_cbcm_enc.c

/* ede_cbcm_enc.c */
/* Written by Ben Laurie <ben@algroup.co.uk> for the OpenSSL
 * project 13 Feb 1999.
 */
/* ====================================================================
 * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
 *
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 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    distribution.
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 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
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 *    licensing@OpenSSL.org.
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 * 5. Products derived from this software may not be called "OpenSSL"
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 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

/*

This is an implementation of Triple DES Cipher Block Chaining with Output
Feedback Masking, by Coppersmith, Johnson and Matyas, (IBM and Certicom).

*/

#include "des_locl.h"

void des_ede3_cbcm_encrypt(const unsigned char *input,unsigned char *output,
			   long length,
			   des_key_schedule ks1,des_key_schedule ks2,
			   des_key_schedule ks3,
			   des_cblock ivec1,des_cblock ivec2,
			   int enc)
    {
    register DES_LONG tin0,tin1;
    register DES_LONG tout0,tout1,xor0,xor1,m0,m1;
    register unsigned char *in,*out;
    register long l=length;
    DES_LONG tin[2];
    unsigned char *iv1,*iv2;

    in=(unsigned char *)input;
    out=(unsigned char *)output;
    iv1=(unsigned char *)ivec1;
    iv2=(unsigned char *)ivec2;

    if (enc)
	{
	c2l(iv1,m0);
	c2l(iv1,m1);
	c2l(iv2,tout0);
	c2l(iv2,tout1);
	for (l-=8; l>=-7; l-=8)
	    {
	    tin[0]=m0;
	    tin[1]=m1;
	    des_encrypt(tin,ks3,1);
	    m0=tin[0];
	    m1=tin[1];

	    if(l < 0)
		{
		c2ln(in,tin0,tin1,l+8);
		}
	    else
		{
		c2l(in,tin0);
		c2l(in,tin1);
		}
	    tin0^=tout0;
	    tin1^=tout1;

	    tin[0]=tin0;
	    tin[1]=tin1;
	    des_encrypt(tin,ks1,1);
	    tin[0]^=m0;
	    tin[1]^=m1;
	    des_encrypt(tin,ks2,0);
	    tin[0]^=m0;
	    tin[1]^=m1;
	    des_encrypt(tin,ks1,1);
	    tout0=tin[0];
	    tout1=tin[1];

	    l2c(tout0,out);
	    l2c(tout1,out);
	    }
	iv1=(unsigned char *)ivec1;
	l2c(m0,iv1);
	l2c(m1,iv1);

	iv2=(unsigned char *)ivec2;
	l2c(tout0,iv2);
	l2c(tout1,iv2);
	}
    else
	{
	register DES_LONG t0,t1;

	c2l(iv1,m0);
	c2l(iv1,m1);
	c2l(iv2,xor0);
	c2l(iv2,xor1);
	for (l-=8; l>=-7; l-=8)
	    {
	    tin[0]=m0;
	    tin[1]=m1;
	    des_encrypt(tin,ks3,1);
	    m0=tin[0];
	    m1=tin[1];

	    c2l(in,tin0);
	    c2l(in,tin1);

	    t0=tin0;
	    t1=tin1;

	    tin[0]=tin0;
	    tin[1]=tin1;
	    des_encrypt(tin,ks1,0);
	    tin[0]^=m0;
	    tin[1]^=m1;
	    des_encrypt(tin,ks2,1);
	    tin[0]^=m0;
	    tin[1]^=m1;
	    des_encrypt(tin,ks1,0);
	    tout0=tin[0];
	    tout1=tin[1];

	    tout0^=xor0;
	    tout1^=xor1;
	    if(l < 0)
		{
		l2cn(tout0,tout1,out,l+8);
		}
	    else
		{
		l2c(tout0,out);
		l2c(tout1,out);
		}
	    xor0=t0;
	    xor1=t1;
	    }

	iv1=(unsigned char *)ivec1;
	l2c(m0,iv1);
	l2c(m1,iv1);

	iv2=(unsigned char *)ivec2;
	l2c(xor0,iv2);
	l2c(xor1,iv2);
	}
    tin0=tin1=tout0=tout1=xor0=xor1=0;
    tin[0]=tin[1]=0;
    }