/* crypto/des/ncbc_enc.c */

 /*

  * #included by:

  *    cbc_enc.c  (DES_cbc_encrypt)

  *    des_enc.c  (DES_ncbc_encrypt)

  */

 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

  * All rights reserved.

  *

  * This package is an SSL implementation written

  * by Eric Young (eay@cryptsoft.com).

  * The implementation was written so as to conform with Netscapes SSL.

  * 

  * This library is free for commercial and non-commercial use as long as

  * the following conditions are aheared to.  The following conditions

  * apply to all code found in this distribution, be it the RC4, RSA,

  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

  * included with this distribution is covered by the same copyright terms

  * except that the holder is Tim Hudson (tjh@cryptsoft.com).

  * 

  * Copyright remains Eric Young's, and as such any Copyright notices in

  * the code are not to be removed.

  * If this package is used in a product, Eric Young should be given attribution

  * as the author of the parts of the library 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 cryptographic software written by

  *     Eric Young (eay@cryptsoft.com)"

  *    The word 'cryptographic' can be left out if the rouines from the library

  *    being used are not cryptographic related :-).

  * 4. If you include any Windows specific code (or a derivative thereof) from 

  *    the apps directory (application code) you must include an acknowledgement:

  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

  * 

  * 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"

 #ifdef CBC_ENC_C__DONT_UPDATE_IV

 EXPORT_C void DES_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,

 		     DES_key_schedule *_schedule, DES_cblock *ivec, int enc)

 #else

 EXPORT_C void DES_ncbc_encrypt(const unsigned char *in, unsigned char *out, long length,

 		     DES_key_schedule *_schedule, DES_cblock *ivec, int enc)

 #endif

 	{

 	register DES_LONG tin0,tin1;

 	register DES_LONG tout0,tout1,xor0,xor1;

 	register long l=length;

 	DES_LONG tin[2];

 	unsigned char *iv;

 	iv = &(*ivec)[0];

 	if (enc)

 		{

 		c2l(iv,tout0);

 		c2l(iv,tout1);

 		for (l-=8; l>=0; l-=8)

 			{

 			c2l(in,tin0);

 			c2l(in,tin1);

 			tin0^=tout0; tin[0]=tin0;

 			tin1^=tout1; tin[1]=tin1;

 			DES_encrypt1((DES_LONG *)tin,_schedule,DES_ENCRYPT);

 			tout0=tin[0]; l2c(tout0,out);

 			tout1=tin[1]; l2c(tout1,out);

 			}

 		if (l != -8)

 			{

 			c2ln(in,tin0,tin1,l+8);

 			tin0^=tout0; tin[0]=tin0;

 			tin1^=tout1; tin[1]=tin1;

 			DES_encrypt1((DES_LONG *)tin,_schedule,DES_ENCRYPT);

 			tout0=tin[0]; l2c(tout0,out);

 			tout1=tin[1]; l2c(tout1,out);

 			}

 #ifndef CBC_ENC_C__DONT_UPDATE_IV

 		iv = &(*ivec)[0];

 		l2c(tout0,iv);

 		l2c(tout1,iv);

 #endif

 		}

 	else

 		{

 		c2l(iv,xor0);

 		c2l(iv,xor1);

 		for (l-=8; l>=0; l-=8)

 			{

 			c2l(in,tin0); tin[0]=tin0;

 			c2l(in,tin1); tin[1]=tin1;

 			DES_encrypt1((DES_LONG *)tin,_schedule,DES_DECRYPT);

 			tout0=tin[0]^xor0;

 			tout1=tin[1]^xor1;

 			l2c(tout0,out);

 			l2c(tout1,out);

 			xor0=tin0;

 			xor1=tin1;

 			}

 		if (l != -8)

 			{

 			c2l(in,tin0); tin[0]=tin0;

 			c2l(in,tin1); tin[1]=tin1;

 			DES_encrypt1((DES_LONG *)tin,_schedule,DES_DECRYPT);

 			tout0=tin[0]^xor0;

 			tout1=tin[1]^xor1;

 			l2cn(tout0,tout1,out,l+8);

 #ifndef CBC_ENC_C__DONT_UPDATE_IV

 			xor0=tin0;

 			xor1=tin1;

 #endif

 			}

 #ifndef CBC_ENC_C__DONT_UPDATE_IV 

 		iv = &(*ivec)[0];

 		l2c(xor0,iv);

 		l2c(xor1,iv);

 #endif

 		}

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

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

 	}