text: /* crypto/bf/bf_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 "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
  	register BF_LONG l,r;
      const register 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
  	register 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
  	register BF_LONG l,r;
      const register 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
  	register 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)
  	{
  	register BF_LONG tin0,tin1;
  	register BF_LONG tout0,tout1,xor0,xor1;
  	register 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
  