rc4_skey.c revision 59191
1139823Simp/* crypto/rc4/rc4_skey.c */ 2116808Sharti/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3116808Sharti * All rights reserved. 4116808Sharti * 5116808Sharti * This package is an SSL implementation written 6116808Sharti * by Eric Young (eay@cryptsoft.com). 7116808Sharti * The implementation was written so as to conform with Netscapes SSL. 8116808Sharti * 9116808Sharti * This library is free for commercial and non-commercial use as long as 10116808Sharti * the following conditions are aheared to. The following conditions 11116808Sharti * apply to all code found in this distribution, be it the RC4, RSA, 12116808Sharti * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13116808Sharti * included with this distribution is covered by the same copyright terms 14116808Sharti * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15116808Sharti * 16116808Sharti * Copyright remains Eric Young's, and as such any Copyright notices in 17116808Sharti * the code are not to be removed. 18116808Sharti * If this package is used in a product, Eric Young should be given attribution 19116808Sharti * as the author of the parts of the library used. 20116808Sharti * This can be in the form of a textual message at program startup or 21116808Sharti * in documentation (online or textual) provided with the package. 22116808Sharti * 23116808Sharti * Redistribution and use in source and binary forms, with or without 24116808Sharti * modification, are permitted provided that the following conditions 25116808Sharti * are met: 26116808Sharti * 1. Redistributions of source code must retain the copyright 27116808Sharti * notice, this list of conditions and the following disclaimer. 28139823Simp * 2. Redistributions in binary form must reproduce the above copyright 29139823Simp * notice, this list of conditions and the following disclaimer in the 30139823Simp * documentation and/or other materials provided with the distribution. 31116808Sharti * 3. All advertising materials mentioning features or use of this software 32116808Sharti * must display the following acknowledgement: 33116808Sharti * "This product includes cryptographic software written by 34116808Sharti * Eric Young (eay@cryptsoft.com)" 35116808Sharti * The word 'cryptographic' can be left out if the rouines from the library 36116808Sharti * being used are not cryptographic related :-). 37116808Sharti * 4. If you include any Windows specific code (or a derivative thereof) from 38116808Sharti * the apps directory (application code) you must include an acknowledgement: 39116808Sharti * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40116808Sharti * 41116808Sharti * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42116808Sharti * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43116808Sharti * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44116808Sharti * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45116808Sharti * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46116808Sharti * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47116808Sharti * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48116808Sharti * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49116808Sharti * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50116808Sharti * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51116808Sharti * SUCH DAMAGE. 52116808Sharti * 53116808Sharti * The licence and distribution terms for any publically available version or 54116808Sharti * derivative of this code cannot be changed. i.e. this code cannot simply be 55116808Sharti * copied and put under another distribution licence 56185571Sbz * [including the GNU Public Licence.] 57116808Sharti */ 58116808Sharti 59116808Sharti#include <openssl/rc4.h> 60116808Sharti#include "rc4_locl.h" 61116808Sharti#include <openssl/opensslv.h> 62116808Sharti 63116808Sharticonst char *RC4_version="RC4" OPENSSL_VERSION_PTEXT; 64116808Sharti 65116808Sharticonst char *RC4_options(void) 66116808Sharti { 67116808Sharti#ifdef RC4_INDEX 68116808Sharti if (sizeof(RC4_INT) == 1) 69116808Sharti return("rc4(idx,char)"); 70116808Sharti else 71116808Sharti return("rc4(idx,int)"); 72116808Sharti#else 73118175Sharti if (sizeof(RC4_INT) == 1) 74116808Sharti return("rc4(ptr,char)"); 75116808Sharti else 76116808Sharti return("rc4(ptr,int)"); 77116808Sharti#endif 78227309Sed } 79227309Sed 80116808Sharti/* RC4 as implemented from a posting from 81116808Sharti * Newsgroups: sci.crypt 82116808Sharti * From: sterndark@netcom.com (David Sterndark) 83116808Sharti * Subject: RC4 Algorithm revealed. 84116808Sharti * Message-ID: <sternCvKL4B.Hyy@netcom.com> 85116808Sharti * Date: Wed, 14 Sep 1994 06:35:31 GMT 86116808Sharti */ 87116808Sharti 88116808Shartivoid RC4_set_key(RC4_KEY *key, int len, const unsigned char *data) 89116808Sharti { 90116808Sharti register RC4_INT tmp; 91116808Sharti register int id1,id2; 92116808Sharti register RC4_INT *d; 93116808Sharti unsigned int i; 94116808Sharti 95116808Sharti d= &(key->data[0]); 96116808Sharti for (i=0; i<256; i++) 97116808Sharti d[i]=i; 98116808Sharti key->x = 0; 99117157Sharti key->y = 0; 100116808Sharti id1=id2=0; 101116808Sharti 102116808Sharti#define SK_LOOP(n) { \ 103116808Sharti tmp=d[(n)]; \ 104116808Sharti id2 = (data[id1] + tmp + id2) & 0xff; \ 105116808Sharti if (++id1 == len) id1=0; \ 106116808Sharti d[(n)]=d[id2]; \ 107116808Sharti d[id2]=tmp; } 108116808Sharti 109116808Sharti for (i=0; i < 256; i+=4) 110116808Sharti { 111116808Sharti SK_LOOP(i+0); 112116808Sharti SK_LOOP(i+1); 113116808Sharti SK_LOOP(i+2); 114116808Sharti SK_LOOP(i+3); 115116808Sharti } 116116808Sharti } 117116808Sharti 118116808Sharti