rc4_skey.c revision 59191
155714Skris/* crypto/rc4/rc4_skey.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 855714Skris * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 1555714Skris * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 2255714Skris * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 3755714Skris * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 4055714Skris * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 5255714Skris * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris 5955714Skris#include <openssl/rc4.h> 6055714Skris#include "rc4_locl.h" 6155714Skris#include <openssl/opensslv.h> 6255714Skris 6355714Skrisconst char *RC4_version="RC4" OPENSSL_VERSION_PTEXT; 6455714Skris 6555714Skrisconst char *RC4_options(void) 6655714Skris { 6755714Skris#ifdef RC4_INDEX 6855714Skris if (sizeof(RC4_INT) == 1) 6955714Skris return("rc4(idx,char)"); 7055714Skris else 7155714Skris return("rc4(idx,int)"); 7255714Skris#else 7355714Skris if (sizeof(RC4_INT) == 1) 7455714Skris return("rc4(ptr,char)"); 7555714Skris else 7655714Skris return("rc4(ptr,int)"); 7755714Skris#endif 7855714Skris } 7955714Skris 8055714Skris/* RC4 as implemented from a posting from 8155714Skris * Newsgroups: sci.crypt 8255714Skris * From: sterndark@netcom.com (David Sterndark) 8355714Skris * Subject: RC4 Algorithm revealed. 8455714Skris * Message-ID: <sternCvKL4B.Hyy@netcom.com> 8555714Skris * Date: Wed, 14 Sep 1994 06:35:31 GMT 8655714Skris */ 8755714Skris 8859191Skrisvoid RC4_set_key(RC4_KEY *key, int len, const unsigned char *data) 8955714Skris { 9055714Skris register RC4_INT tmp; 9155714Skris register int id1,id2; 9255714Skris register RC4_INT *d; 9355714Skris unsigned int i; 9455714Skris 9555714Skris d= &(key->data[0]); 9655714Skris for (i=0; i<256; i++) 9755714Skris d[i]=i; 9855714Skris key->x = 0; 9955714Skris key->y = 0; 10055714Skris id1=id2=0; 10155714Skris 10255714Skris#define SK_LOOP(n) { \ 10355714Skris tmp=d[(n)]; \ 10455714Skris id2 = (data[id1] + tmp + id2) & 0xff; \ 10555714Skris if (++id1 == len) id1=0; \ 10655714Skris d[(n)]=d[id2]; \ 10755714Skris d[id2]=tmp; } 10855714Skris 10955714Skris for (i=0; i < 256; i+=4) 11055714Skris { 11155714Skris SK_LOOP(i+0); 11255714Skris SK_LOOP(i+1); 11355714Skris SK_LOOP(i+2); 11455714Skris SK_LOOP(i+3); 11555714Skris } 11655714Skris } 11755714Skris 118