crypto/rc2/rc2_ecb.c

   1 /* crypto/rc2/rc2_ecb.c */
   2 /* Copyright (C) 1995-1997 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 "rc2.h"
  60 #include "rc2_locl.h"
  61
  62 char *RC2_version="RC2 part of SSLeay 0.8.1b 29-Jun-1998";
  63
  64 /* RC2 as implemented frm a posting from
  65  * Newsgroups: sci.crypt
  66  * Sender: pgut01@cs.auckland.ac.nz (Peter Gutmann)
  67  * Subject: Specification for Ron Rivests Cipher No.2
  68  * Message-ID: <4fk39f$f70@net.auckland.ac.nz>
  69  * Date: 11 Feb 1996 06:45:03 GMT
  70  */
  71
  72 void RC2_ecb_encrypt(in, out, ks, encrypt)
  73 unsigned char *in;
  74 unsigned char *out;
  75 RC2_KEY *ks;
  76 int encrypt;
  77         {
  78         unsigned long l,d[2];
  79
  80         c2l(in,l); d[0]=l;
  81         c2l(in,l); d[1]=l;
  82         RC2_encrypt(d,ks,encrypt);
  83         l=d[0]; l2c(l,out);
  84         l=d[1]; l2c(l,out);
  85         l=d[0]=d[1]=0;
  86         }
  87
  88 void RC2_encrypt(d,key,encrypt)
  89 unsigned long *d;
  90 RC2_KEY *key;
  91 int encrypt;
  92         {
  93         int i,n;
  94         register RC2_INT *p0,*p1;
  95         register RC2_INT x0,x1,x2,x3,t;
  96         unsigned long l;
  97
  98         l=d[0];
  99         x0=(RC2_INT)l&0xffff;
 100         x1=(RC2_INT)(l>>16L);
 101         l=d[1];
 102         x2=(RC2_INT)l&0xffff;
 103         x3=(RC2_INT)(l>>16L);
 104
 105         n=3;
 106         i=5;
 107         if (encrypt)
 108                 {
 109                 p0=p1= &(key->data[0]);
 110                 for (;;)
 111                         {
 112                         t=(x0+(x1& ~x3)+(x2&x3)+ *(p0++))&0xffff;
 113                         x0=(t<<1)|(t>>15);
 114                         t=(x1+(x2& ~x0)+(x3&x0)+ *(p0++))&0xffff;
 115                         x1=(t<<2)|(t>>14);
 116                         t=(x2+(x3& ~x1)+(x0&x1)+ *(p0++))&0xffff;
 117                         x2=(t<<3)|(t>>13);
 118                         t=(x3+(x0& ~x2)+(x1&x2)+ *(p0++))&0xffff;
 119                         x3=(t<<5)|(t>>11);
 120
 121                         if (--i == 0)
 122                                 {
 123                                 if (--n == 0) break;
 124                                 i=(n == 2)?6:5;
 125
 126                                 x0+=p1[x3&0x3f];
 127                                 x1+=p1[x0&0x3f];
 128                                 x2+=p1[x1&0x3f];
 129                                 x3+=p1[x2&0x3f];
 130                                 }
 131                         }
 132                 }
 133         else
 134                 {
 135                 p0= &(key->data[63]);
 136                 p1= &(key->data[0]);
 137                 for (;;)
 138                         {
 139                         t=((x3<<11)|(x3>>5))&0xffff;
 140                         x3=(t-(x0& ~x2)-(x1&x2)- *(p0--))&0xffff;
 141                         t=((x2<<13)|(x2>>3))&0xffff;
 142                         x2=(t-(x3& ~x1)-(x0&x1)- *(p0--))&0xffff;
 143                         t=((x1<<14)|(x1>>2))&0xffff;
 144                         x1=(t-(x2& ~x0)-(x3&x0)- *(p0--))&0xffff;
 145                         t=((x0<<15)|(x0>>1))&0xffff;
 146                         x0=(t-(x1& ~x3)-(x2&x3)- *(p0--))&0xffff;
 147
 148                         if (--i == 0)
 149                                 {
 150                                 if (--n == 0) break;
 151                                 i=(n == 2)?6:5;
 152
 153                                 x3=(x3-p1[x2&0x3f])&0xffff;
 154                                 x2=(x2-p1[x1&0x3f])&0xffff;
 155                                 x1=(x1-p1[x0&0x3f])&0xffff;
 156                                 x0=(x0-p1[x3&0x3f])&0xffff;
 157                                 }
 158                         }
 159                 }
 160
 161         d[0]=(unsigned long)(x0&0xffff)|((unsigned long)(x1&0xffff)<<16L);
 162         d[1]=(unsigned long)(x2&0xffff)|((unsigned long)(x3&0xffff)<<16L);
 163         }