/* crypto/des/des_enc.c */

/* 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"

EXPORT_C void DES_encrypt1(DES_LONG *data, DES_key_schedule *ks, int enc)

	{

	register DES_LONG l,r,t,u;

#ifdef DES_PTR

	register const unsigned char *des_SP=(const unsigned char *)DES_SPtrans;

#endif

#ifndef DES_UNROLL

	register int i;

#endif

	register DES_LONG *s;

	r=data[0];

	l=data[1];

	IP(r,l);

	/* Things have been modified so that the initial rotate is

	 * done outside the loop.  This required the

	 * DES_SPtrans values in sp.h to be rotated 1 bit to the right.

	 * One perl script later and things have a 5% speed up on a sparc2.

	 * Thanks to Richard Outerbridge <71755.204@CompuServe.COM>

	 * for pointing this out. */

	/* clear the top bits on machines with 8byte longs */

	/* shift left by 2 */

	r=ROTATE(r,29)&0xffffffffL;

	l=ROTATE(l,29)&0xffffffffL;

	s=ks->ks->deslong;

	/* I don't know if it is worth the effort of loop unrolling the

	 * inner loop */

	if (enc)

		{

#ifdef DES_UNROLL

		D_ENCRYPT(l,r, 0); /*  1 */

		D_ENCRYPT(r,l, 2); /*  2 */

		D_ENCRYPT(l,r, 4); /*  3 */

		D_ENCRYPT(r,l, 6); /*  4 */

		D_ENCRYPT(l,r, 8); /*  5 */

		D_ENCRYPT(r,l,10); /*  6 */

		D_ENCRYPT(l,r,12); /*  7 */

		D_ENCRYPT(r,l,14); /*  8 */

		D_ENCRYPT(l,r,16); /*  9 */

		D_ENCRYPT(r,l,18); /*  10 */

		D_ENCRYPT(l,r,20); /*  11 */

		D_ENCRYPT(r,l,22); /*  12 */

		D_ENCRYPT(l,r,24); /*  13 */

		D_ENCRYPT(r,l,26); /*  14 */

		D_ENCRYPT(l,r,28); /*  15 */

		D_ENCRYPT(r,l,30); /*  16 */

#else

		for (i=0; i<32; i+=8)

			{

			D_ENCRYPT(l,r,i+0); /*  1 */

			D_ENCRYPT(r,l,i+2); /*  2 */

			D_ENCRYPT(l,r,i+4); /*  3 */

			D_ENCRYPT(r,l,i+6); /*  4 */

			}

#endif

		}

	else

		{

#ifdef DES_UNROLL

		D_ENCRYPT(l,r,30); /* 16 */

		D_ENCRYPT(r,l,28); /* 15 */

		D_ENCRYPT(l,r,26); /* 14 */

		D_ENCRYPT(r,l,24); /* 13 */

		D_ENCRYPT(l,r,22); /* 12 */

		D_ENCRYPT(r,l,20); /* 11 */

		D_ENCRYPT(l,r,18); /* 10 */

		D_ENCRYPT(r,l,16); /*  9 */

		D_ENCRYPT(l,r,14); /*  8 */

		D_ENCRYPT(r,l,12); /*  7 */

		D_ENCRYPT(l,r,10); /*  6 */

		D_ENCRYPT(r,l, 8); /*  5 */

		D_ENCRYPT(l,r, 6); /*  4 */

		D_ENCRYPT(r,l, 4); /*  3 */

		D_ENCRYPT(l,r, 2); /*  2 */

		D_ENCRYPT(r,l, 0); /*  1 */

#else

		for (i=30; i>0; i-=8)

			{

			D_ENCRYPT(l,r,i-0); /* 16 */

			D_ENCRYPT(r,l,i-2); /* 15 */

			D_ENCRYPT(l,r,i-4); /* 14 */

			D_ENCRYPT(r,l,i-6); /* 13 */

			}

#endif

		}

	/* rotate and clear the top bits on machines with 8byte longs */

	l=ROTATE(l,3)&0xffffffffL;

	r=ROTATE(r,3)&0xffffffffL;

	FP(r,l);

	data[0]=l;

	data[1]=r;

	l=r=t=u=0;

	}

EXPORT_C void DES_encrypt2(DES_LONG *data, DES_key_schedule *ks, int enc)

	{

	register DES_LONG l,r,t,u;

#ifdef DES_PTR

	register const unsigned char *des_SP=(const unsigned char *)DES_SPtrans;

#endif

#ifndef DES_UNROLL

	register int i;

#endif

	register DES_LONG *s;

	r=data[0];

	l=data[1];

	/* Things have been modified so that the initial rotate is

	 * done outside the loop.  This required the

	 * DES_SPtrans values in sp.h to be rotated 1 bit to the right.

	 * One perl script later and things have a 5% speed up on a sparc2.

	 * Thanks to Richard Outerbridge <71755.204@CompuServe.COM>

	 * for pointing this out. */

	/* clear the top bits on machines with 8byte longs */

	r=ROTATE(r,29)&0xffffffffL;

	l=ROTATE(l,29)&0xffffffffL;

	s=ks->ks->deslong;

	/* I don't know if it is worth the effort of loop unrolling the

	 * inner loop */

	if (enc)

		{

#ifdef DES_UNROLL

		D_ENCRYPT(l,r, 0); /*  1 */

		D_ENCRYPT(r,l, 2); /*  2 */

		D_ENCRYPT(l,r, 4); /*  3 */

		D_ENCRYPT(r,l, 6); /*  4 */

		D_ENCRYPT(l,r, 8); /*  5 */

		D_ENCRYPT(r,l,10); /*  6 */

		D_ENCRYPT(l,r,12); /*  7 */

		D_ENCRYPT(r,l,14); /*  8 */

		D_ENCRYPT(l,r,16); /*  9 */

		D_ENCRYPT(r,l,18); /*  10 */

		D_ENCRYPT(l,r,20); /*  11 */

		D_ENCRYPT(r,l,22); /*  12 */

		D_ENCRYPT(l,r,24); /*  13 */

		D_ENCRYPT(r,l,26); /*  14 */

		D_ENCRYPT(l,r,28); /*  15 */

		D_ENCRYPT(r,l,30); /*  16 */

#else

		for (i=0; i<32; i+=8)

			{

			D_ENCRYPT(l,r,i+0); /*  1 */

			D_ENCRYPT(r,l,i+2); /*  2 */

			D_ENCRYPT(l,r,i+4); /*  3 */

			D_ENCRYPT(r,l,i+6); /*  4 */

			}

#endif

		}

	else

		{

#ifdef DES_UNROLL

		D_ENCRYPT(l,r,30); /* 16 */

		D_ENCRYPT(r,l,28); /* 15 */

		D_ENCRYPT(l,r,26); /* 14 */

		D_ENCRYPT(r,l,24); /* 13 */

		D_ENCRYPT(l,r,22); /* 12 */

		D_ENCRYPT(r,l,20); /* 11 */

		D_ENCRYPT(l,r,18); /* 10 */

		D_ENCRYPT(r,l,16); /*  9 */

		D_ENCRYPT(l,r,14); /*  8 */

		D_ENCRYPT(r,l,12); /*  7 */

		D_ENCRYPT(l,r,10); /*  6 */

		D_ENCRYPT(r,l, 8); /*  5 */

		D_ENCRYPT(l,r, 6); /*  4 */

		D_ENCRYPT(r,l, 4); /*  3 */

		D_ENCRYPT(l,r, 2); /*  2 */

		D_ENCRYPT(r,l, 0); /*  1 */

#else

		for (i=30; i>0; i-=8)

			{

			D_ENCRYPT(l,r,i-0); /* 16 */

			D_ENCRYPT(r,l,i-2); /* 15 */

			D_ENCRYPT(l,r,i-4); /* 14 */

			D_ENCRYPT(r,l,i-6); /* 13 */

			}

#endif

		}

	/* rotate and clear the top bits on machines with 8byte longs */

	data[0]=ROTATE(l,3)&0xffffffffL;

	data[1]=ROTATE(r,3)&0xffffffffL;

	l=r=t=u=0;

	}

EXPORT_C void DES_encrypt3(DES_LONG *data, DES_key_schedule *ks1,

		  DES_key_schedule *ks2, DES_key_schedule *ks3)

	{

	register DES_LONG l,r;

	l=data[0];

	r=data[1];

	IP(l,r);

	data[0]=l;

	data[1]=r;

	DES_encrypt2((DES_LONG *)data,ks1,DES_ENCRYPT);

	DES_encrypt2((DES_LONG *)data,ks2,DES_DECRYPT);

	DES_encrypt2((DES_LONG *)data,ks3,DES_ENCRYPT);

	l=data[0];

	r=data[1];

	FP(r,l);

	data[0]=l;

	data[1]=r;

	}

EXPORT_C void DES_decrypt3(DES_LONG *data, DES_key_schedule *ks1,

		  DES_key_schedule *ks2, DES_key_schedule *ks3)

	{

	register DES_LONG l,r;

	l=data[0];

	r=data[1];

	IP(l,r);

	data[0]=l;

	data[1]=r;

	DES_encrypt2((DES_LONG *)data,ks3,DES_DECRYPT);

	DES_encrypt2((DES_LONG *)data,ks2,DES_ENCRYPT);

	DES_encrypt2((DES_LONG *)data,ks1,DES_DECRYPT);

	l=data[0];

	r=data[1];

	FP(r,l);

	data[0]=l;

	data[1]=r;

	}

#ifndef DES_DEFAULT_OPTIONS

#undef CBC_ENC_C__DONT_UPDATE_IV

#include "ncbc_enc.c" /* DES_ncbc_encrypt */

EXPORT_C void DES_ede3_cbc_encrypt(const unsigned char *input, unsigned char *output,

			  long length, DES_key_schedule *ks1,

			  DES_key_schedule *ks2, DES_key_schedule *ks3,

			  DES_cblock *ivec, int enc)

	{

	register DES_LONG tin0,tin1;

	register DES_LONG tout0,tout1,xor0,xor1;

	register const unsigned char *in;

	unsigned char *out;

	register long l=length;

	DES_LONG tin[2];

	unsigned char *iv;

	in=input;

	out=output;

	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;

			tin1^=tout1;

			tin[0]=tin0;

			tin[1]=tin1;

			DES_encrypt3((DES_LONG *)tin,ks1,ks2,ks3);

			tout0=tin[0];

			tout1=tin[1];

			l2c(tout0,out);

			l2c(tout1,out);

			}

		if (l != -8)

			{

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

			tin0^=tout0;

			tin1^=tout1;

			tin[0]=tin0;

			tin[1]=tin1;

			DES_encrypt3((DES_LONG *)tin,ks1,ks2,ks3);

			tout0=tin[0];

			tout1=tin[1];

			l2c(tout0,out);

			l2c(tout1,out);

			}

		iv = &(*ivec)[0];

		l2c(tout0,iv);

		l2c(tout1,iv);

		}

	else

		{

		register DES_LONG t0,t1;

		c2l(iv,xor0);

		c2l(iv,xor1);

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

			{

			c2l(in,tin0);

			c2l(in,tin1);

			t0=tin0;

			t1=tin1;

			tin[0]=tin0;

			tin[1]=tin1;

			DES_decrypt3((DES_LONG *)tin,ks1,ks2,ks3);

			tout0=tin[0];

			tout1=tin[1];

			tout0^=xor0;

			tout1^=xor1;

			l2c(tout0,out);

			l2c(tout1,out);

			xor0=t0;

			xor1=t1;

			}

		if (l != -8)

			{

			c2l(in,tin0);

			c2l(in,tin1);

			t0=tin0;

			t1=tin1;

			tin[0]=tin0;

			tin[1]=tin1;

			DES_decrypt3((DES_LONG *)tin,ks1,ks2,ks3);

			tout0=tin[0];

			tout1=tin[1];

			tout0^=xor0;

			tout1^=xor1;

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

			xor0=t0;

			xor1=t1;

			}

		iv = &(*ivec)[0];

		l2c(xor0,iv);

		l2c(xor1,iv);

		}

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

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

	}

#endif /* DES_DEFAULT_OPTIONS */