X-Git-Url: https://code.wpia.club/?a=blobdiff_plain;f=lib%2Fopenssl%2Fcrypto%2Frc4%2Frc4_enc.c;h=be11bade7bc027735d828a9ac1a7d3500367899f;hb=02ed66432c92de70694700164f986190aad3cbc5;hp=8c4fc6c7a3da38451da27f8b429ef340d2684a40;hpb=89016837dcbf2775cd15dc8cbaba00dc6379f86e;p=cassiopeia.git diff --git a/lib/openssl/crypto/rc4/rc4_enc.c b/lib/openssl/crypto/rc4/rc4_enc.c index 8c4fc6c..be11bad 100644 --- a/lib/openssl/crypto/rc4/rc4_enc.c +++ b/lib/openssl/crypto/rc4/rc4_enc.c @@ -1,65 +1,17 @@ -/* crypto/rc4/rc4_enc.c */ -/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) - * All rights reserved. +/* + * Copyright 1995-2016 The OpenSSL Project Authors. 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.] + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html */ #include #include "rc4_locl.h" -/* RC4 as implemented from a posting from +/*- + * RC4 as implemented from a posting from * Newsgroups: sci.crypt * From: sterndark@netcom.com (David Sterndark) * Subject: RC4 Algorithm revealed. @@ -68,248 +20,67 @@ */ void RC4(RC4_KEY *key, size_t len, const unsigned char *indata, - unsigned char *outdata) - { - register RC4_INT *d; - register RC4_INT x,y,tx,ty; - size_t i; - - x=key->x; - y=key->y; - d=key->data; + unsigned char *outdata) +{ + register RC4_INT *d; + register RC4_INT x, y, tx, ty; + size_t i; -#if defined(RC4_CHUNK) - /* - * The original reason for implementing this(*) was the fact that - * pre-21164a Alpha CPUs don't have byte load/store instructions - * and e.g. a byte store has to be done with 64-bit load, shift, - * and, or and finally 64-bit store. Peaking data and operating - * at natural word size made it possible to reduce amount of - * instructions as well as to perform early read-ahead without - * suffering from RAW (read-after-write) hazard. This resulted - * in ~40%(**) performance improvement on 21064 box with gcc. - * But it's not only Alpha users who win here:-) Thanks to the - * early-n-wide read-ahead this implementation also exhibits - * >40% speed-up on SPARC and 20-30% on 64-bit MIPS (depending - * on sizeof(RC4_INT)). - * - * (*) "this" means code which recognizes the case when input - * and output pointers appear to be aligned at natural CPU - * word boundary - * (**) i.e. according to 'apps/openssl speed rc4' benchmark, - * crypto/rc4/rc4speed.c exhibits almost 70% speed-up... - * - * Cavets. - * - * - RC4_CHUNK="unsigned long long" should be a #1 choice for - * UltraSPARC. Unfortunately gcc generates very slow code - * (2.5-3 times slower than one generated by Sun's WorkShop - * C) and therefore gcc (at least 2.95 and earlier) should - * always be told that RC4_CHUNK="unsigned long". - * - * - */ + x = key->x; + y = key->y; + d = key->data; -# define RC4_STEP ( \ - x=(x+1) &0xff, \ - tx=d[x], \ - y=(tx+y)&0xff, \ - ty=d[y], \ - d[y]=tx, \ - d[x]=ty, \ - (RC4_CHUNK)d[(tx+ty)&0xff]\ - ) - - if ( ( ((size_t)indata & (sizeof(RC4_CHUNK)-1)) | - ((size_t)outdata & (sizeof(RC4_CHUNK)-1)) ) == 0 ) - { - RC4_CHUNK ichunk,otp; - const union { long one; char little; } is_endian = {1}; - - /* - * I reckon we can afford to implement both endian - * cases and to decide which way to take at run-time - * because the machine code appears to be very compact - * and redundant 1-2KB is perfectly tolerable (i.e. - * in case the compiler fails to eliminate it:-). By - * suggestion from Terrel Larson - * who also stands for the is_endian union:-) - * - * Special notes. - * - * - is_endian is declared automatic as doing otherwise - * (declaring static) prevents gcc from eliminating - * the redundant code; - * - compilers (those I've tried) don't seem to have - * problems eliminating either the operators guarded - * by "if (sizeof(RC4_CHUNK)==8)" or the condition - * expressions themselves so I've got 'em to replace - * corresponding #ifdefs from the previous version; - * - I chose to let the redundant switch cases when - * sizeof(RC4_CHUNK)!=8 be (were also #ifdefed - * before); - * - in case you wonder "&(sizeof(RC4_CHUNK)*8-1)" in - * [LB]ESHFT guards against "shift is out of range" - * warnings when sizeof(RC4_CHUNK)!=8 - * - * - */ - if (!is_endian.little) - { /* BIG-ENDIAN CASE */ -# define BESHFT(c) (((sizeof(RC4_CHUNK)-(c)-1)*8)&(sizeof(RC4_CHUNK)*8-1)) - for (;len&(0-sizeof(RC4_CHUNK));len-=sizeof(RC4_CHUNK)) - { - ichunk = *(RC4_CHUNK *)indata; - otp = RC4_STEP<x=x; - key->y=y; - return; - } - else - { /* LITTLE-ENDIAN CASE */ -# define LESHFT(c) (((c)*8)&(sizeof(RC4_CHUNK)*8-1)) - for (;len&(0-sizeof(RC4_CHUNK));len-=sizeof(RC4_CHUNK)) - { - ichunk = *(RC4_CHUNK *)indata; - otp = RC4_STEP; - otp |= RC4_STEP<<8; - otp |= RC4_STEP<<16; - otp |= RC4_STEP<<24; - if (sizeof(RC4_CHUNK)==8) - { - otp |= RC4_STEP<>= (sizeof(RC4_CHUNK)-len)<<3; - switch (len&(sizeof(RC4_CHUNK)-1)) - { - case 7: otp = RC4_STEP, i+=8; - case 6: otp |= RC4_STEP<x=x; - key->y=y; - return; - } - } -#endif #define LOOP(in,out) \ - x=((x+1)&0xff); \ - tx=d[x]; \ - y=(tx+y)&0xff; \ - d[x]=ty=d[y]; \ - d[y]=tx; \ - (out) = d[(tx+ty)&0xff]^ (in); - -#ifndef RC4_INDEX -#define RC4_LOOP(a,b,i) LOOP(*((a)++),*((b)++)) -#else -#define RC4_LOOP(a,b,i) LOOP(a[i],b[i]) -#endif + x=((x+1)&0xff); \ + tx=d[x]; \ + y=(tx+y)&0xff; \ + d[x]=ty=d[y]; \ + d[y]=tx; \ + (out) = d[(tx+ty)&0xff]^ (in); - i=len>>3; - if (i) - { - for (;;) - { - RC4_LOOP(indata,outdata,0); - RC4_LOOP(indata,outdata,1); - RC4_LOOP(indata,outdata,2); - RC4_LOOP(indata,outdata,3); - RC4_LOOP(indata,outdata,4); - RC4_LOOP(indata,outdata,5); - RC4_LOOP(indata,outdata,6); - RC4_LOOP(indata,outdata,7); -#ifdef RC4_INDEX - indata+=8; - outdata+=8; -#endif - if (--i == 0) break; - } - } - i=len&0x07; - if (i) - { - for (;;) - { - RC4_LOOP(indata,outdata,0); if (--i == 0) break; - RC4_LOOP(indata,outdata,1); if (--i == 0) break; - RC4_LOOP(indata,outdata,2); if (--i == 0) break; - RC4_LOOP(indata,outdata,3); if (--i == 0) break; - RC4_LOOP(indata,outdata,4); if (--i == 0) break; - RC4_LOOP(indata,outdata,5); if (--i == 0) break; - RC4_LOOP(indata,outdata,6); if (--i == 0) break; - } - } - key->x=x; - key->y=y; - } + i = len >> 3; + if (i) { + for (;;) { + LOOP(indata[0], outdata[0]); + LOOP(indata[1], outdata[1]); + LOOP(indata[2], outdata[2]); + LOOP(indata[3], outdata[3]); + LOOP(indata[4], outdata[4]); + LOOP(indata[5], outdata[5]); + LOOP(indata[6], outdata[6]); + LOOP(indata[7], outdata[7]); + indata += 8; + outdata += 8; + if (--i == 0) + break; + } + } + i = len & 0x07; + if (i) { + for (;;) { + LOOP(indata[0], outdata[0]); + if (--i == 0) + break; + LOOP(indata[1], outdata[1]); + if (--i == 0) + break; + LOOP(indata[2], outdata[2]); + if (--i == 0) + break; + LOOP(indata[3], outdata[3]); + if (--i == 0) + break; + LOOP(indata[4], outdata[4]); + if (--i == 0) + break; + LOOP(indata[5], outdata[5]); + if (--i == 0) + break; + LOOP(indata[6], outdata[6]); + if (--i == 0) + break; + } + } + key->x = x; + key->y = y; +}