/drivers/staging/wlags49_h2/wl_enc.c
https://bitbucket.org/wisechild/galaxy-nexus · C · 232 lines · 74 code · 50 blank · 108 comment · 6 complexity · 028d3a35d5752e98777cf586b2f2d22b MD5 · raw file
- /*******************************************************************************
- * Agere Systems Inc.
- * Wireless device driver for Linux (wlags49).
- *
- * Copyright (c) 1998-2003 Agere Systems Inc.
- * All rights reserved.
- * http://www.agere.com
- *
- * Initially developed by TriplePoint, Inc.
- * http://www.triplepoint.com
- *
- *------------------------------------------------------------------------------
- *
- * This file defines functions related to WEP key coding/decoding.
- *
- *------------------------------------------------------------------------------
- *
- * SOFTWARE LICENSE
- *
- * This software is provided subject to the following terms and conditions,
- * which you should read carefully before using the software. Using this
- * software indicates your acceptance of these terms and conditions. If you do
- * not agree with these terms and conditions, do not use the software.
- *
- * Copyright © 2003 Agere Systems Inc.
- * All rights reserved.
- *
- * Redistribution and use in source or binary forms, with or without
- * modifications, are permitted provided that the following conditions are met:
- *
- * . Redistributions of source code must retain the above copyright notice, this
- * list of conditions and the following Disclaimer as comments in the code as
- * well as in the documentation and/or other materials provided with the
- * distribution.
- *
- * . 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.
- *
- * . Neither the name of Agere Systems Inc. nor the names of the contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * Disclaimer
- *
- * THIS SOFTWARE IS PROVIDED “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, INFRINGEMENT AND THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. ANY
- * USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE IS SOLELY AT THE USERS OWN
- * RISK. IN NO EVENT SHALL AGERE SYSTEMS INC. 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, INCLUDING, BUT NOT LIMITED TO, 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.
- *
- ******************************************************************************/
- /*******************************************************************************
- * include files
- ******************************************************************************/
- #include <linux/string.h>
- #include <wl_version.h>
- #include <debug.h>
- #include <hcf.h>
- #include <wl_enc.h>
- /*******************************************************************************
- * global definitions
- ******************************************************************************/
- #if DBG
- extern dbg_info_t *DbgInfo;
- #endif /* DBG */
- /*******************************************************************************
- * wl_wep_code()
- *******************************************************************************
- *
- * DESCRIPTION:
- *
- * This function encodes a set of wep keys for privacy
- *
- * PARAMETERS:
- *
- * szCrypt -
- * szDest -
- * Data -
- * nLen -
- *
- * RETURNS:
- *
- * OK
- *
- ******************************************************************************/
- int wl_wep_code( char *szCrypt, char *szDest, void *Data, int nLen )
- {
- int i;
- int t;
- int k ;
- char bits;
- char *szData = (char *) Data;
- /*------------------------------------------------------------------------*/
- for( i = bits = 0 ; i < MACADDRESS_STR_LEN; i++ ) {
- bits ^= szCrypt[i];
- bits += szCrypt[i];
- }
- for( i = t = *szDest = 0; i < nLen; i++, t++ ) {
- k = szData[i] ^ ( bits + i );
- switch( i % 3 ) {
- case 0 :
- szDest[t] = ((k & 0xFC) >> 2) + CH_START ;
- szDest[t+1] = ((k & 0x03) << 4) + CH_START ;
- szDest[t+2] = '\0';
- break;
- case 1 :
- szDest[t] += (( k & 0xF0 ) >> 4 );
- szDest[t+1] = (( k & 0x0F ) << 2 ) + CH_START ;
- szDest[t+2] = '\0';
- break;
- case 2 :
- szDest[t] += (( k & 0xC0 ) >> 6 );
- szDest[t+1] = ( k & 0x3F ) + CH_START ;
- szDest[t+2] = '\0';
- t++;
- break;
- }
- }
- return( strlen( szDest )) ;
- }
- /*============================================================================*/
- /*******************************************************************************
- * wl_wep_decode()
- *******************************************************************************
- *
- * DESCRIPTION:
- *
- * This function decodes a set of WEP keys for use by the card.
- *
- * PARAMETERS:
- *
- * szCrypt -
- * szDest -
- * Data -
- *
- * RETURNS:
- *
- * OK
- *
- ******************************************************************************/
- int wl_wep_decode( char *szCrypt, void *Dest, char *szData )
- {
- int i;
- int t;
- int nLen;
- char bits;
- char *szDest = Dest;
- /*------------------------------------------------------------------------*/
- for( i = bits = 0 ; i < 12; i++ ) {
- bits ^= szCrypt[i] ;
- bits += szCrypt[i] ;
- }
- nLen = ( strlen( szData ) * 3) / 4 ;
- for( i = t = 0; i < nLen; i++, t++ ) {
- switch( i % 3 ) {
- case 0 :
- szDest[i] = ((( szData[t]-CH_START ) & 0x3f ) << 2 ) +
- ((( szData[t+1]-CH_START ) & 0x30 ) >> 4 );
- break;
- case 1 :
- szDest[i] = ((( szData[t]-CH_START ) & 0x0f ) << 4 ) +
- ((( szData[t+1]-CH_START ) & 0x3c ) >> 2 );
- break;
- case 2 :
- szDest[i] = ((( szData[t]-CH_START ) & 0x03 ) << 6 ) +
- (( szData[t+1]-CH_START ) & 0x3f );
- t++;
- break;
- }
- szDest[i] ^= ( bits + i ) ;
- }
- return( i ) ;
- }
- /*============================================================================*/