/* 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.

  *

  * 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 above 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 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

  *    prior written permission. For written permission, please contact

  *    licensing@OpenSSL.org.

  *

  * 5. Products derived from this software may not be called "OpenSSL"

  *    nor may "OpenSSL" appear in their names without prior written

  *    permission of the OpenSSL Project.

  *

  * 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

  * EXPRESSED 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 OpenSSL PROJECT OR

  * ITS 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.

  * ====================================================================

  *

  * 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).

 Note that there is a known attack on this by Biham and Knudsen but it takes

 a lot of work:

 http://www.cs.technion.ac.il/users/wwwb/cgi-bin/tr-get.cgi/1998/CS/CS0928.ps.gz

 */

 #include <openssl/opensslconf.h> /* To see if OPENSSL_NO_DESCBCM is defined */

 #ifndef OPENSSL_NO_DESCBCM

 #include "des_locl.h"

 EXPORT_C void DES_ede3_cbcm_encrypt(const unsigned char *in, unsigned char *out,

 	     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 long l=length;

     DES_LONG tin[2];

     unsigned char *iv1,*iv2;

     iv1 = &(*ivec1)[0];

     iv2 = &(*ivec2)[0];

     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_encrypt1(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_encrypt1(tin,ks1,1);

 	    tin[0]^=m0;

 	    tin[1]^=m1;

 	    DES_encrypt1(tin,ks2,0);

 	    tin[0]^=m0;

 	    tin[1]^=m1;

 	    DES_encrypt1(tin,ks1,1);

 	    tout0=tin[0];

 	    tout1=tin[1];

 	    l2c(tout0,out);

 	    l2c(tout1,out);

 	    }

 	iv1=&(*ivec1)[0];

 	l2c(m0,iv1);

 	l2c(m1,iv1);

 	iv2=&(*ivec2)[0];

 	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_encrypt1(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_encrypt1(tin,ks1,0);

 	    tin[0]^=m0;

 	    tin[1]^=m1;

 	    DES_encrypt1(tin,ks2,1);

 	    tin[0]^=m0;

 	    tin[1]^=m1;

 	    DES_encrypt1(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=&(*ivec1)[0];

 	l2c(m0,iv1);

 	l2c(m1,iv1);

 	iv2=&(*ivec2)[0];

 	l2c(xor0,iv2);

 	l2c(xor1,iv2);

 	}

     tin0=tin1=tout0=tout1=xor0=xor1=0;

     tin[0]=tin[1]=0;

     }

 #endif