Line data    Source code

       1             : /* crypto/rc4/rc4_skey.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 <openssl/rc4.h>
      60             : #include "rc4_locl.h"
      61             : #include <openssl/opensslv.h>
      62             : 
      63             : const char RC4_version[] = "RC4" OPENSSL_VERSION_PTEXT;
      64             : 
      65           0 : const char *RC4_options(void)
      66             : {
      67             : #ifdef RC4_INDEX
      68             :     if (sizeof(RC4_INT) == 1)
      69             :         return ("rc4(idx,char)");
      70             :     else
      71             :         return ("rc4(idx,int)");
      72             : #else
      73             :     if (sizeof(RC4_INT) == 1)
      74             :         return ("rc4(ptr,char)");
      75             :     else
      76             :         return ("rc4(ptr,int)");
      77             : #endif
      78             : }
      79             : 
      80             : /*-
      81             :  * RC4 as implemented from a posting from
      82             :  * Newsgroups: sci.crypt
      83             :  * From: sterndark@netcom.com (David Sterndark)
      84             :  * Subject: RC4 Algorithm revealed.
      85             :  * Message-ID: <sternCvKL4B.Hyy@netcom.com>
      86             :  * Date: Wed, 14 Sep 1994 06:35:31 GMT
      87             :  */
      88             : 
      89           0 : void private_RC4_set_key(RC4_KEY *key, int len, const unsigned char *data)
      90             : {
      91             :     register RC4_INT tmp;
      92             :     register int id1, id2;
      93             :     register RC4_INT *d;
      94             :     unsigned int i;
      95             : 
      96           0 :     d = &(key->data[0]);
      97           0 :     key->x = 0;
      98           0 :     key->y = 0;
      99             :     id1 = id2 = 0;
     100             : 
     101             : #define SK_LOOP(d,n) { \
     102             :                 tmp=d[(n)]; \
     103             :                 id2 = (data[id1] + tmp + id2) & 0xff; \
     104             :                 if (++id1 == len) id1=0; \
     105             :                 d[(n)]=d[id2]; \
     106             :                 d[id2]=tmp; }
     107             : 
     108           0 :     for (i = 0; i < 256; i++)
     109           0 :         d[i] = i;
     110           0 :     for (i = 0; i < 256; i += 4) {
     111           0 :         SK_LOOP(d, i + 0);
     112           0 :         SK_LOOP(d, i + 1);
     113           0 :         SK_LOOP(d, i + 2);
     114           0 :         SK_LOOP(d, i + 3);
     115             :     }
     116           0 : }