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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
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