drivers/staging/wlags49_h2/wl_enc.c

   1
   2 /*******************************************************************************
   3  * Agere Systems Inc.
   4  * Wireless device driver for Linux (wlags49).
   5  *
   6  * Copyright (c) 1998-2003 Agere Systems Inc.
   7  * All rights reserved.
   8  *   http://www.agere.com
   9  *
  10  * Initially developed by TriplePoint, Inc.
  11  *   http://www.triplepoint.com
  12  *
  13  *------------------------------------------------------------------------------
  14  *
  15  *   This file defines functions related to WEP key coding/decoding.
  16  *
  17  *------------------------------------------------------------------------------
  18  *
  19  * SOFTWARE LICENSE
  20  *
  21  * This software is provided subject to the following terms and conditions,
  22  * which you should read carefully before using the software.  Using this
  23  * software indicates your acceptance of these terms and conditions.  If you do
  24  * not agree with these terms and conditions, do not use the software.
  25  *
  26  * Copyright © 2003 Agere Systems Inc.
  27  * All rights reserved.
  28  *
  29  * Redistribution and use in source or binary forms, with or without
  30  * modifications, are permitted provided that the following conditions are met:
  31  *
  32  * . Redistributions of source code must retain the above copyright notice, this
  33  *    list of conditions and the following Disclaimer as comments in the code as
  34  *    well as in the documentation and/or other materials provided with the
  35  *    distribution.
  36  *
  37  * . Redistributions in binary form must reproduce the above copyright notice,
  38  *    this list of conditions and the following Disclaimer in the documentation
  39  *    and/or other materials provided with the distribution.
  40  *
  41  * . Neither the name of Agere Systems Inc. nor the names of the contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * Disclaimer
  46  *
  47  * THIS SOFTWARE IS PROVIDED \93AS IS\94 AND ANY EXPRESS OR IMPLIED WARRANTIES,
  48  * INCLUDING, BUT NOT LIMITED TO, INFRINGEMENT AND THE IMPLIED WARRANTIES OF
  49  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  ANY
  50  * USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE IS SOLELY AT THE USERS OWN
  51  * RISK. IN NO EVENT SHALL AGERE SYSTEMS INC. OR CONTRIBUTORS BE LIABLE FOR ANY
  52  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  53  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  54  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  55  * ON ANY THEORY OF LIABILITY, INCLUDING, BUT NOT LIMITED TO, CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  57  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  58  * DAMAGE.
  59  *
  60  ******************************************************************************/
  61
  62
  63
  64
  65 /*******************************************************************************
  66  * VERSION CONTROL INFORMATION
  67  *******************************************************************************
  68  *
  69  * $Author: nico $
  70  * $Date: 2004/07/19 08:16:15 $
  71  * $Revision: 1.2 $
  72  * $Source: /usr/local/cvs/wl_lkm/wireless/wl_enc.c,v $
  73  *
  74  ******************************************************************************/
  75
  76
  77
  78
  79 /*******************************************************************************
  80  *  include files
  81  ******************************************************************************/
  82 #include <wl_version.h>
  83
  84 #include <debug.h>
  85 #include <hcf.h>
  86
  87 #include <wl_enc.h>
  88
  89
  90
  91
  92 /*******************************************************************************
  93  *  global definitions
  94  ******************************************************************************/
  95 #if DBG
  96
  97 extern dbg_info_t *DbgInfo;
  98
  99 #endif  /* DBG */
 100
 101
 102
 103
 104 /*******************************************************************************
 105  *      wl_wep_code()
 106  *******************************************************************************
 107  *
 108  *  DESCRIPTION:
 109  *
 110  *      This function encodes a set of wep keys for privacy
 111  *
 112  *  PARAMETERS:
 113  *
 114  *      szCrypt -
 115  *      szDest  -
 116  *      Data    -
 117  *      nLen    -
 118  *
 119  *  RETURNS:
 120  *
 121  *      OK
 122  *
 123  ******************************************************************************/
 124 int wl_wep_code( char *szCrypt, char *szDest, void *Data, int nLen )
 125 {
 126     int     i;
 127     int     t;
 128     int     k ;
 129     char    bits;
 130     char    *szData = (char *) Data;
 131     /*------------------------------------------------------------------------*/
 132
 133
 134     for( i = bits = 0 ; i < MACADDRESS_STR_LEN; i++ ) {
 135             bits ^= szCrypt[i];
 136             bits += szCrypt[i];
 137     }
 138
 139     for( i = t = *szDest = 0; i < nLen; i++, t++ ) {
 140             k = szData[i] ^ ( bits + i );
 141
 142
 143         switch( i % 3 ) {
 144
 145         case 0 :
 146
 147             szDest[t]   = ((k & 0xFC) >> 2) + CH_START ;
 148                         szDest[t+1] = ((k & 0x03) << 4) + CH_START ;
 149                 szDest[t+2] = '\0';
 150
 151             break;
 152
 153
 154         case 1 :
 155
 156             szDest[t]  += (( k & 0xF0 ) >> 4 );
 157                         szDest[t+1] = (( k & 0x0F ) << 2 ) + CH_START ;
 158                 szDest[t+2] = '\0';
 159
 160             break;
 161
 162
 163         case 2 :
 164
 165             szDest[t]  += (( k & 0xC0 ) >> 6 );
 166                         szDest[t+1] = ( k & 0x3F ) + CH_START ;
 167                 szDest[t+2] = '\0';
 168                 t++;
 169
 170             break;
 171         }
 172     }
 173
 174     return( strlen( szDest )) ;
 175
 176 }
 177 /*============================================================================*/
 178
 179
 180
 181
 182 /*******************************************************************************
 183  *      wl_wep_decode()
 184  *******************************************************************************
 185  *
 186  *  DESCRIPTION:
 187  *
 188  *      This function decodes a set of WEP keys for use by the card.
 189  *
 190  *  PARAMETERS:
 191  *
 192  *      szCrypt -
 193  *      szDest  -
 194  *      Data    -
 195  *
 196  *  RETURNS:
 197  *
 198  *      OK
 199  *
 200  ******************************************************************************/
 201 int wl_wep_decode( char *szCrypt, void *Dest, char *szData )
 202 {
 203     int     i;
 204     int     t;
 205     int     nLen;
 206     char    bits;
 207     char    *szDest = Dest;
 208   /*------------------------------------------------------------------------*/
 209
 210
 211   for( i = bits = 0 ; i < 12; i++ ) {
 212       bits ^= szCrypt[i] ;
 213       bits += szCrypt[i] ;
 214   }
 215
 216   nLen = ( strlen( szData ) * 3) / 4 ;
 217
 218   for( i = t = 0; i < nLen; i++, t++ ) {
 219       switch( i % 3 ) {
 220       case 0 :
 221
 222           szDest[i] = ((( szData[t]-CH_START ) & 0x3f ) << 2 ) +
 223                       ((( szData[t+1]-CH_START ) & 0x30 ) >> 4 );
 224               break;
 225
 226
 227       case 1 :
 228           szDest[i] = ((( szData[t]-CH_START ) & 0x0f ) << 4 ) +
 229                       ((( szData[t+1]-CH_START ) & 0x3c ) >> 2 );
 230               break;
 231
 232
 233       case 2 :
 234           szDest[i] = ((( szData[t]-CH_START ) & 0x03 ) << 6 ) +
 235                        (( szData[t+1]-CH_START ) & 0x3f );
 236               t++;
 237               break;
 238       }
 239
 240         szDest[i] ^= ( bits + i ) ;
 241
 242   }
 243
 244   return( i ) ;
 245
 246 }
 247 /*============================================================================*/
 248