/* 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 #include "rc4_locl.h" #include 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: * 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]); key->x = 0; key->y = 0; id1=id2=0; #define SK_LOOP(d,n) { \ tmp=d[(n)]; \ id2 = (data[id1] + tmp + id2) & 0xff; \ if (++id1 == len) id1=0; \ d[(n)]=d[id2]; \ d[id2]=tmp; } #if defined(OPENSSL_CPUID_OBJ) && !defined(OPENSSL_NO_ASM) # if defined(__i386) || defined(__i386__) || defined(_M_IX86) || \ defined(__INTEL__) || \ defined(__x86_64) || defined(__x86_64__) || defined(_M_AMD64) if (sizeof(RC4_INT) > 1) { /* * Unlike all other x86 [and x86_64] implementations, * Intel P4 core [including EM64T] was found to perform * poorly with wider RC4_INT. Performance improvement * for IA-32 hand-coded assembler turned out to be 2.8x * if re-coded for RC4_CHAR! It's however inappropriate * to just switch to RC4_CHAR for x86[_64], as non-P4 * implementations suffer from significant performance * losses then, e.g. PIII exhibits >2x deterioration, * and so does Opteron. In order to assure optimal * all-round performance, we detect P4 at run-time by * checking upon reserved bit 20 in CPU capability * vector and set up compressed key schedule, which is * recognized by correspondingly updated assembler * module... Bit 20 is set up by OPENSSL_ia32_cpuid. * * */ if (OPENSSL_ia32cap_P & (1<<20)) { unsigned char *cp=(unsigned char *)d; for (i=0;i<256;i++) cp[i]=i; for (i=0;i<256;i++) SK_LOOP(cp,i); /* mark schedule as compressed! */ d[256/sizeof(RC4_INT)]=-1; return; } } # endif #endif for (i=0; i < 256; i++) d[i]=i; for (i=0; i < 256; i+=4) { SK_LOOP(d,i+0); SK_LOOP(d,i+1); SK_LOOP(d,i+2); SK_LOOP(d,i+3); } }