/* $OpenBSD: bf_enc.c,v 1.6 2014/10/28 07:35:58 jsg Exp $ */

/* 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 <openssl/blowfish.h>

#include "bf_locl.h"

/* Blowfish as implemented from 'Blowfish: Springer-Verlag paper'

 * (From LECTURE NOTES IN COMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION,

 * CAMBRIDGE SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993)

 */

#if (BF_ROUNDS != 16) && (BF_ROUNDS != 20)

#error If you set BF_ROUNDS to some value other than 16 or 20, you will have \

to modify the code.

#endif

void BF_encrypt(BF_LONG *data, const BF_KEY *key)

  {

#ifndef BF_PTR2

  BF_LONG l,r;

  const BF_LONG *p,*s;

  p=key->P;

  s= &(key->S[0]);

  l=data[0];

  r=data[1];

  l^=p[0];

  BF_ENC(r,l,s,p[ 1]);

  BF_ENC(l,r,s,p[ 2]);

  BF_ENC(r,l,s,p[ 3]);

  BF_ENC(l,r,s,p[ 4]);

  BF_ENC(r,l,s,p[ 5]);

  BF_ENC(l,r,s,p[ 6]);

  BF_ENC(r,l,s,p[ 7]);

  BF_ENC(l,r,s,p[ 8]);

  BF_ENC(r,l,s,p[ 9]);

  BF_ENC(l,r,s,p[10]);

  BF_ENC(r,l,s,p[11]);

  BF_ENC(l,r,s,p[12]);

  BF_ENC(r,l,s,p[13]);

  BF_ENC(l,r,s,p[14]);

  BF_ENC(r,l,s,p[15]);

  BF_ENC(l,r,s,p[16]);

#if BF_ROUNDS == 20

  BF_ENC(r,l,s,p[17]);

  BF_ENC(l,r,s,p[18]);

  BF_ENC(r,l,s,p[19]);

  BF_ENC(l,r,s,p[20]);

#endif

  r^=p[BF_ROUNDS+1];

  data[1]=l&0xffffffffL;

  data[0]=r&0xffffffffL;

#else

  BF_LONG l,r,t,*k;

  l=data[0];

  r=data[1];

  k=(BF_LONG*)key;

  l^=k[0];

  BF_ENC(r,l,k, 1);

  BF_ENC(l,r,k, 2);

  BF_ENC(r,l,k, 3);

  BF_ENC(l,r,k, 4);

  BF_ENC(r,l,k, 5);

  BF_ENC(l,r,k, 6);

  BF_ENC(r,l,k, 7);

  BF_ENC(l,r,k, 8);

  BF_ENC(r,l,k, 9);

  BF_ENC(l,r,k,10);

  BF_ENC(r,l,k,11);

  BF_ENC(l,r,k,12);

  BF_ENC(r,l,k,13);

  BF_ENC(l,r,k,14);

  BF_ENC(r,l,k,15);

  BF_ENC(l,r,k,16);

#if BF_ROUNDS == 20

  BF_ENC(r,l,k,17);

  BF_ENC(l,r,k,18);

  BF_ENC(r,l,k,19);

  BF_ENC(l,r,k,20);

#endif

  r^=k[BF_ROUNDS+1];

  data[1]=l&0xffffffffL;

  data[0]=r&0xffffffffL;

#endif

  }

#ifndef BF_DEFAULT_OPTIONS

void BF_decrypt(BF_LONG *data, const BF_KEY *key)

  {

#ifndef BF_PTR2

  BF_LONG l,r;

  const BF_LONG *p,*s;

  p=key->P;

  s= &(key->S[0]);

  l=data[0];

  r=data[1];

  l^=p[BF_ROUNDS+1];

#if BF_ROUNDS == 20

  BF_ENC(r,l,s,p[20]);

  BF_ENC(l,r,s,p[19]);

  BF_ENC(r,l,s,p[18]);

  BF_ENC(l,r,s,p[17]);

#endif

  BF_ENC(r,l,s,p[16]);

  BF_ENC(l,r,s,p[15]);

  BF_ENC(r,l,s,p[14]);

  BF_ENC(l,r,s,p[13]);

  BF_ENC(r,l,s,p[12]);

  BF_ENC(l,r,s,p[11]);

  BF_ENC(r,l,s,p[10]);

  BF_ENC(l,r,s,p[ 9]);

  BF_ENC(r,l,s,p[ 8]);

  BF_ENC(l,r,s,p[ 7]);

  BF_ENC(r,l,s,p[ 6]);

  BF_ENC(l,r,s,p[ 5]);

  BF_ENC(r,l,s,p[ 4]);

  BF_ENC(l,r,s,p[ 3]);

  BF_ENC(r,l,s,p[ 2]);

  BF_ENC(l,r,s,p[ 1]);

  r^=p[0];

  data[1]=l&0xffffffffL;

  data[0]=r&0xffffffffL;

#else

  BF_LONG l,r,t,*k;

  l=data[0];

  r=data[1];

  k=(BF_LONG *)key;

  l^=k[BF_ROUNDS+1];

#if BF_ROUNDS == 20

  BF_ENC(r,l,k,20);

  BF_ENC(l,r,k,19);

  BF_ENC(r,l,k,18);

  BF_ENC(l,r,k,17);

#endif

  BF_ENC(r,l,k,16);

  BF_ENC(l,r,k,15);

  BF_ENC(r,l,k,14);

  BF_ENC(l,r,k,13);

  BF_ENC(r,l,k,12);

  BF_ENC(l,r,k,11);

  BF_ENC(r,l,k,10);

  BF_ENC(l,r,k, 9);

  BF_ENC(r,l,k, 8);

  BF_ENC(l,r,k, 7);

  BF_ENC(r,l,k, 6);

  BF_ENC(l,r,k, 5);

  BF_ENC(r,l,k, 4);

  BF_ENC(l,r,k, 3);

  BF_ENC(r,l,k, 2);

  BF_ENC(l,r,k, 1);

  r^=k[0];

  data[1]=l&0xffffffffL;

  data[0]=r&0xffffffffL;

#endif

  }

void BF_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,

       const BF_KEY *schedule, unsigned char *ivec, int encrypt)

  {

  BF_LONG tin0,tin1;

  BF_LONG tout0,tout1,xor0,xor1;

  long l=length;

  BF_LONG tin[2];

  if (encrypt)

    {

    n2l(ivec,tout0);

    n2l(ivec,tout1);

    ivec-=8;

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

      {

      n2l(in,tin0);

      n2l(in,tin1);

      tin0^=tout0;

      tin1^=tout1;

      tin[0]=tin0;

      tin[1]=tin1;

      BF_encrypt(tin,schedule);

      tout0=tin[0];

      tout1=tin[1];

      l2n(tout0,out);

      l2n(tout1,out);

      }

    if (l != -8)

      {

      n2ln(in,tin0,tin1,l+8);

      tin0^=tout0;

      tin1^=tout1;

      tin[0]=tin0;

      tin[1]=tin1;

      BF_encrypt(tin,schedule);

      tout0=tin[0];

      tout1=tin[1];

      l2n(tout0,out);

      l2n(tout1,out);

      }

    l2n(tout0,ivec);

    l2n(tout1,ivec);

    }

  else

    {

    n2l(ivec,xor0);

    n2l(ivec,xor1);

    ivec-=8;

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

      {

      n2l(in,tin0);

      n2l(in,tin1);

      tin[0]=tin0;

      tin[1]=tin1;

      BF_decrypt(tin,schedule);

      tout0=tin[0]^xor0;

      tout1=tin[1]^xor1;

      l2n(tout0,out);

      l2n(tout1,out);

      xor0=tin0;

      xor1=tin1;

      }

    if (l != -8)

      {

      n2l(in,tin0);

      n2l(in,tin1);

      tin[0]=tin0;

      tin[1]=tin1;

      BF_decrypt(tin,schedule);

      tout0=tin[0]^xor0;

      tout1=tin[1]^xor1;

      l2nn(tout0,tout1,out,l+8);

      xor0=tin0;

      xor1=tin1;

      }

    l2n(xor0,ivec);

    l2n(xor1,ivec);

    }

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

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

  }

#endif