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des_enc.c

/* crypto/des/des_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 "des_locl.h"
#include "spr.h"

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 <71755.204@CompuServe.COM>
       * 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+=4)
                  {
                  D_ENCRYPT(l,r,i+0); /*  1 */
                  D_ENCRYPT(r,l,i+2); /*  2 */
                  }
#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-=4)
                  {
                  D_ENCRYPT(l,r,i-0); /* 16 */
                  D_ENCRYPT(r,l,i-2); /* 15 */
                  }
#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 <71755.204@CompuServe.COM>
       * 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+=4)
                  {
                  D_ENCRYPT(l,r,i+0); /*  1 */
                  D_ENCRYPT(r,l,i+2); /*  2 */
                  }
#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-=4)
                  {
                  D_ENCRYPT(l,r,i-0); /* 16 */
                  D_ENCRYPT(r,l,i-2); /* 15 */
                  }
#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;
      }

#ifndef DES_DEFAULT_OPTIONS

#undef CBC_ENC_C__DONT_UPDATE_IV
#include "ncbc_enc.c" /* DES_ncbc_encrypt */

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;
      }

#endif /* DES_DEFAULT_OPTIONS */

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