You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
116 lines
4.4 KiB
116 lines
4.4 KiB
/* 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 <openssl/rc4.h> |
|
#include "rc4_locl.h" |
|
#include <openssl/opensslv.h> |
|
|
|
const char RC4_version[] = "RC4" OPENSSL_VERSION_PTEXT; |
|
|
|
const char *RC4_options(void) |
|
{ |
|
#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 private_RC4_set_key(RC4_KEY *key, int len, const unsigned char *data) |
|
{ |
|
register RC4_INT tmp; |
|
register int id1, id2; |
|
register RC4_INT *d; |
|
unsigned int i; |
|
|
|
d = &(key->data[0]); |
|
key->x = 0; |
|
key->y = 0; |
|
id1 = id2 = 0; |
|
|
|
#define SK_LOOP(d,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++) |
|
d[i] = i; |
|
for (i = 0; i < 256; i += 4) { |
|
SK_LOOP(d, i + 0); |
|
SK_LOOP(d, i + 1); |
|
SK_LOOP(d, i + 2); |
|
SK_LOOP(d, i + 3); |
|
} |
|
}
|
|
|