![Joe Perches](/assets/img/avatar_default.png)
Neatening only. git diff -w shows no differences. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
/*
|
|
* Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* File: rc4.c
|
|
*
|
|
* Purpose:
|
|
*
|
|
* Functions:
|
|
*
|
|
* Revision History:
|
|
*
|
|
* Author: Kyle Hsu
|
|
*
|
|
* Date: Sep 4, 2002
|
|
*
|
|
*/
|
|
|
|
#include "rc4.h"
|
|
|
|
void rc4_init(PRC4Ext pRC4, unsigned char *pbyKey, unsigned int cbKey_len)
|
|
{
|
|
unsigned int ust1, ust2;
|
|
unsigned int keyindex;
|
|
unsigned int stateindex;
|
|
unsigned char *pbyst;
|
|
unsigned int idx;
|
|
|
|
pbyst = pRC4->abystate;
|
|
pRC4->ux = 0;
|
|
pRC4->uy = 0;
|
|
for (idx = 0; idx < 256; idx++)
|
|
pbyst[idx] = (unsigned char)idx;
|
|
keyindex = 0;
|
|
stateindex = 0;
|
|
for (idx = 0; idx < 256; idx++) {
|
|
ust1 = pbyst[idx];
|
|
stateindex = (stateindex + pbyKey[keyindex] + ust1) & 0xff;
|
|
ust2 = pbyst[stateindex];
|
|
pbyst[stateindex] = (unsigned char)ust1;
|
|
pbyst[idx] = (unsigned char)ust2;
|
|
if (++keyindex >= cbKey_len)
|
|
keyindex = 0;
|
|
}
|
|
}
|
|
|
|
unsigned int rc4_byte(PRC4Ext pRC4)
|
|
{
|
|
unsigned int ux;
|
|
unsigned int uy;
|
|
unsigned int ustx, usty;
|
|
unsigned char *pbyst;
|
|
|
|
pbyst = pRC4->abystate;
|
|
ux = (pRC4->ux + 1) & 0xff;
|
|
ustx = pbyst[ux];
|
|
uy = (ustx + pRC4->uy) & 0xff;
|
|
usty = pbyst[uy];
|
|
pRC4->ux = ux;
|
|
pRC4->uy = uy;
|
|
pbyst[uy] = (unsigned char)ustx;
|
|
pbyst[ux] = (unsigned char)usty;
|
|
|
|
return pbyst[(ustx + usty) & 0xff];
|
|
}
|
|
|
|
void rc4_encrypt(PRC4Ext pRC4, unsigned char *pbyDest,
|
|
unsigned char *pbySrc, unsigned int cbData_len)
|
|
{
|
|
unsigned int ii;
|
|
for (ii = 0; ii < cbData_len; ii++)
|
|
pbyDest[ii] = (unsigned char)(pbySrc[ii] ^ rc4_byte(pRC4));
|
|
}
|