Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 | |
| 63 | const char RC4_version[]="RC4" OPENSSL_VERSION_PTEXT; |
| 64 | |
| 65 | const char *RC4_options(void) |
| 66 | { |
| 67 | #ifdef RC4_INDEX |
| 68 | if (sizeof(RC4_INT) == 1) |
| 69 | return("rc4(idx,char)"); |
| 70 | else |
| 71 | return("rc4(idx,int)"); |
| 72 | #else |
| 73 | if (sizeof(RC4_INT) == 1) |
| 74 | return("rc4(ptr,char)"); |
| 75 | else |
| 76 | return("rc4(ptr,int)"); |
| 77 | #endif |
| 78 | } |
| 79 | |
| 80 | /* RC4 as implemented from a posting from |
| 81 | * Newsgroups: sci.crypt |
| 82 | * From: sterndark@netcom.com (David Sterndark) |
| 83 | * Subject: RC4 Algorithm revealed. |
| 84 | * Message-ID: <sternCvKL4B.Hyy@netcom.com> |
| 85 | * Date: Wed, 14 Sep 1994 06:35:31 GMT |
| 86 | */ |
| 87 | |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 88 | void RC4_set_key(RC4_KEY *key, int len, const unsigned char *data) |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 89 | { |
| 90 | register RC4_INT tmp; |
| 91 | register int id1,id2; |
| 92 | register RC4_INT *d; |
| 93 | unsigned int i; |
| 94 | |
| 95 | d= &(key->data[0]); |
| 96 | key->x = 0; |
| 97 | key->y = 0; |
| 98 | id1=id2=0; |
| 99 | |
| 100 | #define SK_LOOP(d,n) { \ |
| 101 | tmp=d[(n)]; \ |
| 102 | id2 = (data[id1] + tmp + id2) & 0xff; \ |
| 103 | if (++id1 == len) id1=0; \ |
| 104 | d[(n)]=d[id2]; \ |
| 105 | d[id2]=tmp; } |
| 106 | |
Alexandre Savard | 7541067 | 2012-08-08 09:50:01 -0400 | [diff] [blame] | 107 | #if defined(OPENSSL_CPUID_OBJ) && !defined(OPENSSL_NO_ASM) |
| 108 | # if defined(__i386) || defined(__i386__) || defined(_M_IX86) || \ |
| 109 | defined(__INTEL__) || \ |
| 110 | defined(__x86_64) || defined(__x86_64__) || defined(_M_AMD64) |
| 111 | if (sizeof(RC4_INT) > 1) { |
| 112 | /* |
| 113 | * Unlike all other x86 [and x86_64] implementations, |
| 114 | * Intel P4 core [including EM64T] was found to perform |
| 115 | * poorly with wider RC4_INT. Performance improvement |
| 116 | * for IA-32 hand-coded assembler turned out to be 2.8x |
| 117 | * if re-coded for RC4_CHAR! It's however inappropriate |
| 118 | * to just switch to RC4_CHAR for x86[_64], as non-P4 |
| 119 | * implementations suffer from significant performance |
| 120 | * losses then, e.g. PIII exhibits >2x deterioration, |
| 121 | * and so does Opteron. In order to assure optimal |
| 122 | * all-round performance, let us [try to] detect P4 at |
| 123 | * run-time by checking upon HTT bit in CPU capability |
| 124 | * vector and set up compressed key schedule, which is |
| 125 | * recognized by correspondingly updated assembler |
| 126 | * module... |
| 127 | * <appro@fy.chalmers.se> |
| 128 | */ |
| 129 | if (OPENSSL_ia32cap_P & (1<<28)) { |
| 130 | unsigned char *cp=(unsigned char *)d; |
| 131 | |
| 132 | for (i=0;i<256;i++) cp[i]=i; |
| 133 | for (i=0;i<256;i++) SK_LOOP(cp,i); |
| 134 | /* mark schedule as compressed! */ |
| 135 | d[256/sizeof(RC4_INT)]=-1; |
| 136 | return; |
| 137 | } |
| 138 | } |
| 139 | # endif |
| 140 | #endif |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 141 | for (i=0; i < 256; i++) d[i]=i; |
| 142 | for (i=0; i < 256; i+=4) |
| 143 | { |
| 144 | SK_LOOP(d,i+0); |
| 145 | SK_LOOP(d,i+1); |
| 146 | SK_LOOP(d,i+2); |
| 147 | SK_LOOP(d,i+3); |
| 148 | } |
| 149 | } |
| 150 | |