/* crypto/rc4/rc4_skey.c *//* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. *  * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to.  The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code.  The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). *  * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. *  * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright *    notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software *    must display the following acknowledgement: *    "This product includes cryptographic software written by *     Eric Young (eay@cryptsoft.com)" *    The word 'cryptographic' can be left out if the rouines from the library *    being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from  *    the apps directory (application code) you must include an acknowledgement: *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" *  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. *  * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed.  i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */#include <openssl/rc4.h>#include "rc4_locl.h"#include <openssl/opensslv.h>const char *RC4_version="RC4" OPENSSL_VERSION_PTEXT;const char *RC4_options(void)	{#ifdef RC4_INDEX	if (sizeof(RC4_INT) == 1)		return("rc4(idx,char)");	else		return("rc4(idx,int)");#else	if (sizeof(RC4_INT) == 1)		return("rc4(ptr,char)");	else		return("rc4(ptr,int)");#endif	}/* RC4 as implemented from a posting from * Newsgroups: sci.crypt * From: sterndark@netcom.com (David Sterndark) * Subject: RC4 Algorithm revealed. * Message-ID: <sternCvKL4B.Hyy@netcom.com> * Date: Wed, 14 Sep 1994 06:35:31 GMT */void RC4_set_key(RC4_KEY *key, int len, const unsigned char *data)	{        register RC4_INT tmp;        register int id1,id2;        register RC4_INT *d;        unsigned int i;                d= &(key->data[0]);	for (i=0; i<256; i++)		d[i]=i;        key->x = 0;             key->y = 0;             id1=id2=0;     #define SK_LOOP(n) { \		tmp=d[(n)]; \		id2 = (data[id1] + tmp + id2) & 0xff; \		if (++id1 == len) id1=0; \		d[(n)]=d[id2]; \		d[id2]=tmp; }	for (i=0; i < 256; i+=4)		{		SK_LOOP(i+0);		SK_LOOP(i+1);		SK_LOOP(i+2);		SK_LOOP(i+3);		}	}