/* crypto/des/des_enc.c */
/* Copyright (C) 1995-1998 Eric Young ([email protected])
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young ([email protected]).
* 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 ([email protected]).
*
* 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 ([email protected])"
*    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 ([email protected])"
*
* 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: des_enc.c,v 1.4 2005/12/11 12:20:52 christos Exp $");

#include <sys/types.h>
#include <crypto/des/des_locl.h>

extern  const DES_LONG des_SPtrans[8][64];

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 <[email protected]>
        * 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;
}

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 <[email protected]>
        * 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;
}

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;
}

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;
}

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