AppleCSP/open_ssl/misc/rc4_skey.c

   1 /*
   2  * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * The contents of this file constitute Original Code as defined in and are
   5  * subject to the Apple Public Source License Version 1.2 (the 'License').
   6  * You may not use this file except in compliance with the License. Please obtain
   7  * a copy of the License at http://www.apple.com/publicsource and read it before
   8  * using this file.
   9  *
  10  * This Original Code and all software distributed under the License are
  11  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
  12  * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
  13  * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  14  * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
  15  * specific language governing rights and limitations under the License.
  16  */
  17
  18
  19 /* crypto/rc4/rc4_skey.c */
  20 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  21  * All rights reserved.
  22  *
  23  * This package is an SSL implementation written
  24  * by Eric Young (eay@cryptsoft.com).
  25  * The implementation was written so as to conform with Netscapes SSL.
  26  *
  27  * This library is free for commercial and non-commercial use as long as
  28  * the following conditions are aheared to.  The following conditions
  29  * apply to all code found in this distribution, be it the RC4, RSA,
  30  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  31  * included with this distribution is covered by the same copyright terms
  32  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  33  *
  34  * Copyright remains Eric Young's, and as such any Copyright notices in
  35  * the code are not to be removed.
  36  * If this package is used in a product, Eric Young should be given attribution
  37  * as the author of the parts of the library used.
  38  * This can be in the form of a textual message at program startup or
  39  * in documentation (online or textual) provided with the package.
  40  *
  41  * Redistribution and use in source and binary forms, with or without
  42  * modification, are permitted provided that the following conditions
  43  * are met:
  44  * 1. Redistributions of source code must retain the copyright
  45  *    notice, this list of conditions and the following disclaimer.
  46  * 2. Redistributions in binary form must reproduce the above copyright
  47  *    notice, this list of conditions and the following disclaimer in the
  48  *    documentation and/or other materials provided with the distribution.
  49  * 3. All advertising materials mentioning features or use of this software
  50  *    must display the following acknowledgement:
  51  *    "This product includes cryptographic software written by
  52  *     Eric Young (eay@cryptsoft.com)"
  53  *    The word 'cryptographic' can be left out if the rouines from the library
  54  *    being used are not cryptographic related :-).
  55  * 4. If you include any Windows specific code (or a derivative thereof) from
  56  *    the apps directory (application code) you must include an acknowledgement:
  57  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  58  *
  59  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  60  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  61  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  62  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  63  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  64  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  65  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  66  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  67  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  68  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  69  * SUCH DAMAGE.
  70  *
  71  * The licence and distribution terms for any publically available version or
  72  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  73  * copied and put under another distribution licence
  74  * [including the GNU Public Licence.]
  75  */
  76
  77 #include <openssl/rc4.h>
  78
  79 #ifndef _OPENSSL_APPLE_CDSA_
  80
  81 #include "rc4_locl.h"
  82 #include <openssl/opensslv.h>
  83
  84 const char *RC4_version="RC4" OPENSSL_VERSION_PTEXT;
  85
  86 const char *RC4_options(void)
  87         {
  88 #ifdef RC4_INDEX
  89         if (sizeof(RC4_INT) == 1)
  90                 return("rc4(idx,char)");
  91         else
  92                 return("rc4(idx,int)");
  93 #else
  94         if (sizeof(RC4_INT) == 1)
  95                 return("rc4(ptr,char)");
  96         else
  97                 return("rc4(ptr,int)");
  98 #endif
  99         }
 100
 101 #endif  /* _OPENSSL_APPLE_CDSA_*/
 102
 103 /* RC4 as implemented from a posting from
 104  * Newsgroups: sci.crypt
 105  * From: sterndark@netcom.com (David Sterndark)
 106  * Subject: RC4 Algorithm revealed.
 107  * Message-ID: <sternCvKL4B.Hyy@netcom.com>
 108  * Date: Wed, 14 Sep 1994 06:35:31 GMT
 109  */
 110
 111 void RC4_set_key(RC4_KEY *key, int len, const unsigned char *data)
 112         {
 113         register RC4_INT tmp;
 114         register int id1,id2;
 115         register RC4_INT *d;
 116         unsigned int i;
 117
 118         d= &(key->data[0]);
 119         for (i=0; i<256; i++)
 120                 d[i]=i;
 121         key->x = 0;
 122         key->y = 0;
 123         id1=id2=0;
 124
 125 #define SK_LOOP(n) { \
 126                 tmp=d[(n)]; \
 127                 id2 = (data[id1] + tmp + id2) & 0xff; \
 128                 if (++id1 == len) id1=0; \
 129                 d[(n)]=d[id2]; \
 130                 d[id2]=tmp; }
 131
 132         for (i=0; i < 256; i+=4)
 133                 {
 134                 SK_LOOP(i+0);
 135                 SK_LOOP(i+1);
 136                 SK_LOOP(i+2);
 137                 SK_LOOP(i+3);
 138                 }
 139         }
 140