crypto/rc5/rc5_enc.c

   1 /* crypto/rc5/rc5_enc.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <openssl/rc5.h>
  61 #include "rc5_locl.h"
  62
  63 void RC5_32_cbc_encrypt(const unsigned char *in, unsigned char *out,
  64                         long length, RC5_32_KEY *ks, unsigned char *iv,
  65                         int encrypt)
  66         {
  67         register unsigned long tin0,tin1;
  68         register unsigned long tout0,tout1,xor0,xor1;
  69         register long l=length;
  70         unsigned long tin[2];
  71
  72         if (encrypt)
  73                 {
  74                 c2l(iv,tout0);
  75                 c2l(iv,tout1);
  76                 iv-=8;
  77                 for (l-=8; l>=0; l-=8)
  78                         {
  79                         c2l(in,tin0);
  80                         c2l(in,tin1);
  81                         tin0^=tout0;
  82                         tin1^=tout1;
  83                         tin[0]=tin0;
  84                         tin[1]=tin1;
  85                         RC5_32_encrypt(tin,ks);
  86                         tout0=tin[0]; l2c(tout0,out);
  87                         tout1=tin[1]; l2c(tout1,out);
  88                         }
  89                 if (l != -8)
  90                         {
  91                         c2ln(in,tin0,tin1,l+8);
  92                         tin0^=tout0;
  93                         tin1^=tout1;
  94                         tin[0]=tin0;
  95                         tin[1]=tin1;
  96                         RC5_32_encrypt(tin,ks);
  97                         tout0=tin[0]; l2c(tout0,out);
  98                         tout1=tin[1]; l2c(tout1,out);
  99                         }
 100                 l2c(tout0,iv);
 101                 l2c(tout1,iv);
 102                 }
 103         else
 104                 {
 105                 c2l(iv,xor0);
 106                 c2l(iv,xor1);
 107                 iv-=8;
 108                 for (l-=8; l>=0; l-=8)
 109                         {
 110                         c2l(in,tin0); tin[0]=tin0;
 111                         c2l(in,tin1); tin[1]=tin1;
 112                         RC5_32_decrypt(tin,ks);
 113                         tout0=tin[0]^xor0;
 114                         tout1=tin[1]^xor1;
 115                         l2c(tout0,out);
 116                         l2c(tout1,out);
 117                         xor0=tin0;
 118                         xor1=tin1;
 119                         }
 120                 if (l != -8)
 121                         {
 122                         c2l(in,tin0); tin[0]=tin0;
 123                         c2l(in,tin1); tin[1]=tin1;
 124                         RC5_32_decrypt(tin,ks);
 125                         tout0=tin[0]^xor0;
 126                         tout1=tin[1]^xor1;
 127                         l2cn(tout0,tout1,out,l+8);
 128                         xor0=tin0;
 129                         xor1=tin1;
 130                         }
 131                 l2c(xor0,iv);
 132                 l2c(xor1,iv);
 133                 }
 134         tin0=tin1=tout0=tout1=xor0=xor1=0;
 135         tin[0]=tin[1]=0;
 136         }
 137
 138 void RC5_32_encrypt(unsigned long *d, RC5_32_KEY *key)
 139         {
 140         RC5_32_INT a,b,*s;
 141
 142         s=key->data;
 143
 144         a=d[0]+s[0];
 145         b=d[1]+s[1];
 146         E_RC5_32(a,b,s, 2);
 147         E_RC5_32(a,b,s, 4);
 148         E_RC5_32(a,b,s, 6);
 149         E_RC5_32(a,b,s, 8);
 150         E_RC5_32(a,b,s,10);
 151         E_RC5_32(a,b,s,12);
 152         E_RC5_32(a,b,s,14);
 153         E_RC5_32(a,b,s,16);
 154         if (key->rounds == 12)
 155                 {
 156                 E_RC5_32(a,b,s,18);
 157                 E_RC5_32(a,b,s,20);
 158                 E_RC5_32(a,b,s,22);
 159                 E_RC5_32(a,b,s,24);
 160                 }
 161         else if (key->rounds == 16)
 162                 {
 163                 /* Do a full expansion to avoid a jump */
 164                 E_RC5_32(a,b,s,18);
 165                 E_RC5_32(a,b,s,20);
 166                 E_RC5_32(a,b,s,22);
 167                 E_RC5_32(a,b,s,24);
 168                 E_RC5_32(a,b,s,26);
 169                 E_RC5_32(a,b,s,28);
 170                 E_RC5_32(a,b,s,30);
 171                 E_RC5_32(a,b,s,32);
 172                 }
 173         d[0]=a;
 174         d[1]=b;
 175         }
 176
 177 void RC5_32_decrypt(unsigned long *d, RC5_32_KEY *key)
 178         {
 179         RC5_32_INT a,b,*s;
 180
 181         s=key->data;
 182
 183         a=d[0];
 184         b=d[1];
 185         if (key->rounds == 16)
 186                 {
 187                 D_RC5_32(a,b,s,32);
 188                 D_RC5_32(a,b,s,30);
 189                 D_RC5_32(a,b,s,28);
 190                 D_RC5_32(a,b,s,26);
 191                 /* Do a full expansion to avoid a jump */
 192                 D_RC5_32(a,b,s,24);
 193                 D_RC5_32(a,b,s,22);
 194                 D_RC5_32(a,b,s,20);
 195                 D_RC5_32(a,b,s,18);
 196                 }
 197         else if (key->rounds == 12)
 198                 {
 199                 D_RC5_32(a,b,s,24);
 200                 D_RC5_32(a,b,s,22);
 201                 D_RC5_32(a,b,s,20);
 202                 D_RC5_32(a,b,s,18);
 203                 }
 204         D_RC5_32(a,b,s,16);
 205         D_RC5_32(a,b,s,14);
 206         D_RC5_32(a,b,s,12);
 207         D_RC5_32(a,b,s,10);
 208         D_RC5_32(a,b,s, 8);
 209         D_RC5_32(a,b,s, 6);
 210         D_RC5_32(a,b,s, 4);
 211         D_RC5_32(a,b,s, 2);
 212         d[0]=a-s[0];
 213         d[1]=b-s[1];
 214         }
 215