rc4_skey.c revision 225736
1/* crypto/rc4/rc4_skey.c */ 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59#include <openssl/rc4.h> 60#include "rc4_locl.h" 61#include <openssl/opensslv.h> 62#include <openssl/crypto.h> 63#ifdef OPENSSL_FIPS 64#include <openssl/fips.h> 65#endif 66 67 68const char RC4_version[]="RC4" OPENSSL_VERSION_PTEXT; 69 70const char *RC4_options(void) 71 { 72#ifdef RC4_INDEX 73 if (sizeof(RC4_INT) == 1) 74 return("rc4(idx,char)"); 75 else 76 return("rc4(idx,int)"); 77#else 78 if (sizeof(RC4_INT) == 1) 79 return("rc4(ptr,char)"); 80 else 81 return("rc4(ptr,int)"); 82#endif 83 } 84 85/* RC4 as implemented from a posting from 86 * Newsgroups: sci.crypt 87 * From: sterndark@netcom.com (David Sterndark) 88 * Subject: RC4 Algorithm revealed. 89 * Message-ID: <sternCvKL4B.Hyy@netcom.com> 90 * Date: Wed, 14 Sep 1994 06:35:31 GMT 91 */ 92 93#ifdef OPENSSL_FIPS 94void private_RC4_set_key(RC4_KEY *key, int len, const unsigned char *data) 95#else 96void RC4_set_key(RC4_KEY *key, int len, const unsigned char *data) 97#endif 98 { 99 register RC4_INT tmp; 100 register int id1,id2; 101 register RC4_INT *d; 102 unsigned int i; 103 104 d= &(key->data[0]); 105 key->x = 0; 106 key->y = 0; 107 id1=id2=0; 108 109#define SK_LOOP(d,n) { \ 110 tmp=d[(n)]; \ 111 id2 = (data[id1] + tmp + id2) & 0xff; \ 112 if (++id1 == len) id1=0; \ 113 d[(n)]=d[id2]; \ 114 d[id2]=tmp; } 115 116#if defined(OPENSSL_CPUID_OBJ) && !defined(OPENSSL_NO_ASM) 117# if defined(__i386) || defined(__i386__) || defined(_M_IX86) || \ 118 defined(__INTEL__) || \ 119 defined(__x86_64) || defined(__x86_64__) || defined(_M_AMD64) 120 if (sizeof(RC4_INT) > 1) { 121 /* 122 * Unlike all other x86 [and x86_64] implementations, 123 * Intel P4 core [including EM64T] was found to perform 124 * poorly with wider RC4_INT. Performance improvement 125 * for IA-32 hand-coded assembler turned out to be 2.8x 126 * if re-coded for RC4_CHAR! It's however inappropriate 127 * to just switch to RC4_CHAR for x86[_64], as non-P4 128 * implementations suffer from significant performance 129 * losses then, e.g. PIII exhibits >2x deterioration, 130 * and so does Opteron. In order to assure optimal 131 * all-round performance, we detect P4 at run-time by 132 * checking upon reserved bit 20 in CPU capability 133 * vector and set up compressed key schedule, which is 134 * recognized by correspondingly updated assembler 135 * module... Bit 20 is set up by OPENSSL_ia32_cpuid. 136 * 137 * <appro@fy.chalmers.se> 138 */ 139#ifdef OPENSSL_FIPS 140 unsigned long *ia32cap_ptr = OPENSSL_ia32cap_loc(); 141 if (ia32cap_ptr && (*ia32cap_ptr & (1<<28))) { 142#else 143 if (OPENSSL_ia32cap_P & (1<<28)) { 144#endif 145 unsigned char *cp=(unsigned char *)d; 146 147 for (i=0;i<256;i++) cp[i]=i; 148 for (i=0;i<256;i++) SK_LOOP(cp,i); 149 /* mark schedule as compressed! */ 150 d[256/sizeof(RC4_INT)]=-1; 151 return; 152 } 153 } 154# endif 155#endif 156 for (i=0; i < 256; i++) d[i]=i; 157 for (i=0; i < 256; i+=4) 158 { 159 SK_LOOP(d,i+0); 160 SK_LOOP(d,i+1); 161 SK_LOOP(d,i+2); 162 SK_LOOP(d,i+3); 163 } 164 } 165 166