/* 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_cbc.c,v 1.8 2005/12/11 12:20:52 christos Exp $");

#include <sys/types.h>

#include <crypto/des/des_locl.h>

void des_ncbc_encrypt(const unsigned char *in, unsigned char *out, long length,
            des_key_schedule schedule, des_cblock *ivec, int enc)
{
       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);
                       }
               iv = &(*ivec)[0];
               l2c(tout0,iv);
               l2c(tout1,iv);
               }
       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);
                       xor0=tin0;
                       xor1=tin1;
                       }
               iv = &(*ivec)[0];
               l2c(xor0,iv);
               l2c(xor1,iv);
               }
       tin0=tin1=tout0=tout1=xor0=xor1=0;
       tin[0]=tin[1]=0;
}

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;
}

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