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+/* 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 <openssl/rc4.h>
+#include "rc4_locl.h"
+#include <openssl/opensslv.h>
+
+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: <sternCvKL4B.Hyy@netcom.com>
+ * 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, let us [try to] detect P4 at
+ * run-time by checking upon HTT bit in CPU capability
+ * vector and set up compressed key schedule, which is
+ * recognized by correspondingly updated assembler
+ * module...
+ * <appro@fy.chalmers.se>
+ */
+ if (OPENSSL_ia32cap_P & (1<<28)) {
+ 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);
+ }
+ }
+