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rc2_cbc.c

/* crypto/rc2/rc2_cbc.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 <openssl/rc2.h>
#include "rc2_locl.h"

void RC2_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
           RC2_KEY *ks, unsigned char *iv, int encrypt)
      {
      register unsigned long tin0,tin1;
      register unsigned long tout0,tout1,xor0,xor1;
      register long l=length;
      unsigned long tin[2];

      if (encrypt)
            {
            c2l(iv,tout0);
            c2l(iv,tout1);
            iv-=8;
            for (l-=8; l>=0; l-=8)
                  {
                  c2l(in,tin0);
                  c2l(in,tin1);
                  tin0^=tout0;
                  tin1^=tout1;
                  tin[0]=tin0;
                  tin[1]=tin1;
                  RC2_encrypt(tin,ks);
                  tout0=tin[0]; l2c(tout0,out);
                  tout1=tin[1]; l2c(tout1,out);
                  }
            if (l != -8)
                  {
                  c2ln(in,tin0,tin1,l+8);
                  tin0^=tout0;
                  tin1^=tout1;
                  tin[0]=tin0;
                  tin[1]=tin1;
                  RC2_encrypt(tin,ks);
                  tout0=tin[0]; l2c(tout0,out);
                  tout1=tin[1]; l2c(tout1,out);
                  }
            l2c(tout0,iv);
            l2c(tout1,iv);
            }
      else
            {
            c2l(iv,xor0);
            c2l(iv,xor1);
            iv-=8;
            for (l-=8; l>=0; l-=8)
                  {
                  c2l(in,tin0); tin[0]=tin0;
                  c2l(in,tin1); tin[1]=tin1;
                  RC2_decrypt(tin,ks);
                  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;
                  RC2_decrypt(tin,ks);
                  tout0=tin[0]^xor0;
                  tout1=tin[1]^xor1;
                  l2cn(tout0,tout1,out,l+8);
                  xor0=tin0;
                  xor1=tin1;
                  }
            l2c(xor0,iv);
            l2c(xor1,iv);
            }
      tin0=tin1=tout0=tout1=xor0=xor1=0;
      tin[0]=tin[1]=0;
      }

void RC2_encrypt(unsigned long *d, RC2_KEY *key)
      {
      int i,n;
      register RC2_INT *p0,*p1;
      register RC2_INT x0,x1,x2,x3,t;
      unsigned long l;

      l=d[0];
      x0=(RC2_INT)l&0xffff;
      x1=(RC2_INT)(l>>16L);
      l=d[1];
      x2=(RC2_INT)l&0xffff;
      x3=(RC2_INT)(l>>16L);

      n=3;
      i=5;

      p0=p1= &(key->data[0]);
      for (;;)
            {
            t=(x0+(x1& ~x3)+(x2&x3)+ *(p0++))&0xffff;
            x0=(t<<1)|(t>>15);
            t=(x1+(x2& ~x0)+(x3&x0)+ *(p0++))&0xffff;
            x1=(t<<2)|(t>>14);
            t=(x2+(x3& ~x1)+(x0&x1)+ *(p0++))&0xffff;
            x2=(t<<3)|(t>>13);
            t=(x3+(x0& ~x2)+(x1&x2)+ *(p0++))&0xffff;
            x3=(t<<5)|(t>>11);

            if (--i == 0)
                  {
                  if (--n == 0) break;
                  i=(n == 2)?6:5;

                  x0+=p1[x3&0x3f];
                  x1+=p1[x0&0x3f];
                  x2+=p1[x1&0x3f];
                  x3+=p1[x2&0x3f];
                  }
            }

      d[0]=(unsigned long)(x0&0xffff)|((unsigned long)(x1&0xffff)<<16L);
      d[1]=(unsigned long)(x2&0xffff)|((unsigned long)(x3&0xffff)<<16L);
      }

void RC2_decrypt(unsigned long *d, RC2_KEY *key)
      {
      int i,n;
      register RC2_INT *p0,*p1;
      register RC2_INT x0,x1,x2,x3,t;
      unsigned long l;

      l=d[0];
      x0=(RC2_INT)l&0xffff;
      x1=(RC2_INT)(l>>16L);
      l=d[1];
      x2=(RC2_INT)l&0xffff;
      x3=(RC2_INT)(l>>16L);

      n=3;
      i=5;

      p0= &(key->data[63]);
      p1= &(key->data[0]);
      for (;;)
            {
            t=((x3<<11)|(x3>>5))&0xffff;
            x3=(t-(x0& ~x2)-(x1&x2)- *(p0--))&0xffff;
            t=((x2<<13)|(x2>>3))&0xffff;
            x2=(t-(x3& ~x1)-(x0&x1)- *(p0--))&0xffff;
            t=((x1<<14)|(x1>>2))&0xffff;
            x1=(t-(x2& ~x0)-(x3&x0)- *(p0--))&0xffff;
            t=((x0<<15)|(x0>>1))&0xffff;
            x0=(t-(x1& ~x3)-(x2&x3)- *(p0--))&0xffff;

            if (--i == 0)
                  {
                  if (--n == 0) break;
                  i=(n == 2)?6:5;

                  x3=(x3-p1[x2&0x3f])&0xffff;
                  x2=(x2-p1[x1&0x3f])&0xffff;
                  x1=(x1-p1[x0&0x3f])&0xffff;
                  x0=(x0-p1[x3&0x3f])&0xffff;
                  }
            }

      d[0]=(unsigned long)(x0&0xffff)|((unsigned long)(x1&0xffff)<<16L);
      d[1]=(unsigned long)(x2&0xffff)|((unsigned long)(x3&0xffff)<<16L);
      }


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