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openssl/crypto/rc4/rc4_enc.org
Ralf S. Engelschall d02b48c63a Import of old SSLeay release: SSLeay 0.8.1b
1998-12-21 10:52:47 +00:00

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* crypto/rc4/rc4_enc.org * /* Copyright (C) 1995-1997 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.
    1. 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.
    1. 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 :-).
    1. 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.]

*/

/* WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING

  • Always modify rc4_enc.org since rc4_enc.c is automatically generated from
  • it during SSLeay configuration.
  • WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING

*/

#include "rc4.h"

/* if this is defined data[i] is used instead of *data, this is a %20

  • speedup on x86 */

#define RC4_INDEX

char *RC4_version="RC4 part of SSLeay 0.8.1b 29-Jun-1998";

char *RC4_options() { #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(key, len, data) RC4_KEY *key; int len; register unsigned char *data; { register RC4_INT tmp; register int id1,id2; register RC4_INT *d; unsigned int i;

d= &(key->data[0]); for (i=0; i<256; i++) d[i]=i; key->x = 0; key->y = 0; id1=id2=0;

#define SK_LOOP(n) { \ tmp=d[(n)]; \ id2 = (data[id1] + tmp + id2) & 0xff; \ if (++id1 == len) id1=0; \ d[(n)]=d[id2]; \ d[id2]=tmp; }

for (i=0; i < 256; i+=4) { SK_LOOP(i+0); SK_LOOP(i+1); SK_LOOP(i+2); SK_LOOP(i+3); } }

void RC4(key, len, indata, outdata) RC4_KEY *key; unsigned long len; unsigned char *indata; unsigned char *outdata; { register RC4_INT *d; register RC4_INT x,y,tx,ty; int i;

x=key->x; y=key->y; d=key->data;

#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

i= -(int)len; i=(int)(len>>3L); 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=(int)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; }