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117 lines
4.3 KiB
C
117 lines
4.3 KiB
C
/* crypto/rc4/rc4_skey.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <openssl/rc4.h>
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#include "rc4_locl.h"
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#include <openssl/opensslv.h>
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const char RC4_version[]="RC4" OPENSSL_VERSION_PTEXT;
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const char *RC4_options(void)
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{
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#ifdef RC4_INDEX
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if (sizeof(RC4_INT) == 1)
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return("rc4(idx,char)");
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else
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return("rc4(idx,int)");
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#else
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if (sizeof(RC4_INT) == 1)
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return("rc4(ptr,char)");
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else
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return("rc4(ptr,int)");
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#endif
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}
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/* RC4 as implemented from a posting from
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* Newsgroups: sci.crypt
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* From: sterndark@netcom.com (David Sterndark)
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* Subject: RC4 Algorithm revealed.
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* Message-ID: <sternCvKL4B.Hyy@netcom.com>
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* Date: Wed, 14 Sep 1994 06:35:31 GMT
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*/
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void private_RC4_set_key(RC4_KEY *key, int len, const unsigned char *data)
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{
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register RC4_INT tmp;
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register int id1,id2;
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register RC4_INT *d;
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unsigned int i;
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d= &(key->data[0]);
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key->x = 0;
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key->y = 0;
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id1=id2=0;
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#define SK_LOOP(d,n) { \
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tmp=d[(n)]; \
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id2 = (data[id1] + tmp + id2) & 0xff; \
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if (++id1 == len) id1=0; \
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d[(n)]=d[id2]; \
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d[id2]=tmp; }
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for (i=0; i < 256; i++) d[i]=i;
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for (i=0; i < 256; i+=4)
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{
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SK_LOOP(d,i+0);
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SK_LOOP(d,i+1);
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SK_LOOP(d,i+2);
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SK_LOOP(d,i+3);
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}
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}
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