ssl/libcrypto/src/crypto/rc4/rc4_skey.c
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 02:01:42 +0200
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permissions -rw-r--r--
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/* crypto/rc4/rc4_skey.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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 * All rights reserved.
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 *
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 * This package is an SSL implementation written
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 * by Eric Young (eay@cryptsoft.com).
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 * The implementation was written so as to conform with Netscapes SSL.
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 * 
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 * This library is free for commercial and non-commercial use as long as
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 * the following conditions are aheared to.  The following conditions
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 * apply to all code found in this distribution, be it the RC4, RSA,
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 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
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 * included with this distribution is covered by the same copyright terms
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 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
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 * 
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 * Copyright remains Eric Young's, and as such any Copyright notices in
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 * the code are not to be removed.
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 * If this package is used in a product, Eric Young should be given attribution
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 * as the author of the parts of the library used.
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 * This can be in the form of a textual message at program startup or
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 * in documentation (online or textual) provided with the package.
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 * 
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. All advertising materials mentioning features or use of this software
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 *    must display the following acknowledgement:
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 *    "This product includes cryptographic software written by
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 *     Eric Young (eay@cryptsoft.com)"
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 *    The word 'cryptographic' can be left out if the rouines from the library
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 *    being used are not cryptographic related :-).
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 * 4. If you include any Windows specific code (or a derivative thereof) from 
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 *    the apps directory (application code) you must include an acknowledgement:
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 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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 * 
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 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 * 
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 * The licence and distribution terms for any publically available version or
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 * derivative of this code cannot be changed.  i.e. this code cannot simply be
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 * copied and put under another distribution licence
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 * [including the GNU Public Licence.]
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 */
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#include <openssl/rc4.h>
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#include "rc4_locl.h"
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#include <openssl/opensslv.h>
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const char RC4_version[]="RC4" OPENSSL_VERSION_PTEXT;
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EXPORT_C const char *RC4_options(void)
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	{
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#ifdef RC4_INDEX
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	if (sizeof(RC4_INT) == 1)
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		return("rc4(idx,char)");
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	else
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		return("rc4(idx,int)");
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#else
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	if (sizeof(RC4_INT) == 1)
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		return("rc4(ptr,char)");
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	else
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		return("rc4(ptr,int)");
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#endif
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	}
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/* RC4 as implemented from a posting from
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 * Newsgroups: sci.crypt
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 * From: sterndark@netcom.com (David Sterndark)
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 * Subject: RC4 Algorithm revealed.
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 * Message-ID: <sternCvKL4B.Hyy@netcom.com>
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 * Date: Wed, 14 Sep 1994 06:35:31 GMT
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 */
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EXPORT_C void RC4_set_key(RC4_KEY *key, int len, const unsigned char *data)
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	{
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        register RC4_INT tmp;
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        register int id1,id2;
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        register RC4_INT *d;
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        unsigned int i;
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        d= &(key->data[0]);
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        key->x = 0;     
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        key->y = 0;     
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        id1=id2=0;     
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#define SK_LOOP(d,n) { \
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		tmp=d[(n)]; \
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		id2 = (data[id1] + tmp + id2) & 0xff; \
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		if (++id1 == len) id1=0; \
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		d[(n)]=d[id2]; \
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		d[id2]=tmp; }
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#if defined(OPENSSL_CPUID_OBJ) && !defined(OPENSSL_NO_ASM)
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# if	defined(__i386)   || defined(__i386__)   || defined(_M_IX86) || \
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	defined(__INTEL__) || \
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	defined(__x86_64) || defined(__x86_64__) || defined(_M_AMD64)
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	if (sizeof(RC4_INT) > 1) {
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		/*
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		 * Unlike all other x86 [and x86_64] implementations,
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		 * Intel P4 core [including EM64T] was found to perform
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		 * poorly with wider RC4_INT. Performance improvement
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		 * for IA-32 hand-coded assembler turned out to be 2.8x
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		 * if re-coded for RC4_CHAR! It's however inappropriate
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		 * to just switch to RC4_CHAR for x86[_64], as non-P4
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		 * implementations suffer from significant performance
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		 * losses then, e.g. PIII exhibits >2x deterioration,
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		 * and so does Opteron. In order to assure optimal
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		 * all-round performance, let us [try to] detect P4 at
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		 * run-time by checking upon HTT bit in CPU capability
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		 * vector and set up compressed key schedule, which is
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		 * recognized by correspondingly updated assembler
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		 * module...
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		 *				<appro@fy.chalmers.se>
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		 */
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		if (OPENSSL_ia32cap_P & (1<<28)) {
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			unsigned char *cp=(unsigned char *)d;
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			for (i=0;i<256;i++) cp[i]=i;
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			for (i=0;i<256;i++) SK_LOOP(cp,i);
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			/* mark schedule as compressed! */
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			d[256/sizeof(RC4_INT)]=-1;
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			return;
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		}
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	}
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# endif
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#endif
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	for (i=0; i < 256; i++) d[i]=i;
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	for (i=0; i < 256; i+=4)
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		{
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		SK_LOOP(d,i+0);
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		SK_LOOP(d,i+1);
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		SK_LOOP(d,i+2);
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		SK_LOOP(d,i+3);
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		}
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	}
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   150