a165822bc9
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@7215 ec53bebd-3082-4978-b11e-865c3cabbd6b
102 lines
4.0 KiB
C
102 lines
4.0 KiB
C
/* 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 "des_locl.h"
|
|
#include "rc4.h"
|
|
|
|
RCSID("$Id$");
|
|
|
|
/* 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, 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);
|
|
}
|
|
}
|
|
|