release/src-rt-6.x.4708/linux/linux-2.6.36/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 “AS IS” 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  *  include files
  64  ******************************************************************************/
  65 #include <linux/string.h>
  66 #include <wl_version.h>
  67
  68 #include <debug.h>
  69 #include <hcf.h>
  70
  71 #include <wl_enc.h>
  72
  73
  74
  75
  76 /*******************************************************************************
  77  *  global definitions
  78  ******************************************************************************/
  79 #if DBG
  80
  81 extern dbg_info_t *DbgInfo;
  82
  83 #endif  /* DBG */
  84
  85
  86
  87
  88 /*******************************************************************************
  89  *      wl_wep_code()
  90  *******************************************************************************
  91  *
  92  *  DESCRIPTION:
  93  *
  94  *      This function encodes a set of wep keys for privacy
  95  *
  96  *  PARAMETERS:
  97  *
  98  *      szCrypt -
  99  *      szDest  -
 100  *      Data    -
 101  *      nLen    -
 102  *
 103  *  RETURNS:
 104  *
 105  *      OK
 106  *
 107  ******************************************************************************/
 108 int wl_wep_code( char *szCrypt, char *szDest, void *Data, int nLen )
 109 {
 110     int     i;
 111     int     t;
 112     int     k ;
 113     char    bits;
 114     char    *szData = (char *) Data;
 115     /*------------------------------------------------------------------------*/
 116
 117
 118     for( i = bits = 0 ; i < MACADDRESS_STR_LEN; i++ ) {
 119             bits ^= szCrypt[i];
 120             bits += szCrypt[i];
 121     }
 122
 123     for( i = t = *szDest = 0; i < nLen; i++, t++ ) {
 124             k = szData[i] ^ ( bits + i );
 125
 126
 127         switch( i % 3 ) {
 128
 129         case 0 :
 130
 131             szDest[t]   = ((k & 0xFC) >> 2) + CH_START ;
 132                         szDest[t+1] = ((k & 0x03) << 4) + CH_START ;
 133                 szDest[t+2] = '\0';
 134
 135             break;
 136
 137
 138         case 1 :
 139
 140             szDest[t]  += (( k & 0xF0 ) >> 4 );
 141                         szDest[t+1] = (( k & 0x0F ) << 2 ) + CH_START ;
 142                 szDest[t+2] = '\0';
 143
 144             break;
 145
 146
 147         case 2 :
 148
 149             szDest[t]  += (( k & 0xC0 ) >> 6 );
 150                         szDest[t+1] = ( k & 0x3F ) + CH_START ;
 151                 szDest[t+2] = '\0';
 152                 t++;
 153
 154             break;
 155         }
 156     }
 157
 158     return( strlen( szDest )) ;
 159
 160 }
 161 /*============================================================================*/
 162
 163
 164
 165
 166 /*******************************************************************************
 167  *      wl_wep_decode()
 168  *******************************************************************************
 169  *
 170  *  DESCRIPTION:
 171  *
 172  *      This function decodes a set of WEP keys for use by the card.
 173  *
 174  *  PARAMETERS:
 175  *
 176  *      szCrypt -
 177  *      szDest  -
 178  *      Data    -
 179  *
 180  *  RETURNS:
 181  *
 182  *      OK
 183  *
 184  ******************************************************************************/
 185 int wl_wep_decode( char *szCrypt, void *Dest, char *szData )
 186 {
 187     int     i;
 188     int     t;
 189     int     nLen;
 190     char    bits;
 191     char    *szDest = Dest;
 192   /*------------------------------------------------------------------------*/
 193
 194
 195   for( i = bits = 0 ; i < 12; i++ ) {
 196       bits ^= szCrypt[i] ;
 197       bits += szCrypt[i] ;
 198   }
 199
 200   nLen = ( strlen( szData ) * 3) / 4 ;
 201
 202   for( i = t = 0; i < nLen; i++, t++ ) {
 203       switch( i % 3 ) {
 204       case 0 :
 205
 206           szDest[i] = ((( szData[t]-CH_START ) & 0x3f ) << 2 ) +
 207                       ((( szData[t+1]-CH_START ) & 0x30 ) >> 4 );
 208               break;
 209
 210
 211       case 1 :
 212           szDest[i] = ((( szData[t]-CH_START ) & 0x0f ) << 4 ) +
 213                       ((( szData[t+1]-CH_START ) & 0x3c ) >> 2 );
 214               break;
 215
 216
 217       case 2 :
 218           szDest[i] = ((( szData[t]-CH_START ) & 0x03 ) << 6 ) +
 219                        (( szData[t+1]-CH_START ) & 0x3f );
 220               t++;
 221               break;
 222       }
 223
 224         szDest[i] ^= ( bits + i ) ;
 225
 226   }
 227
 228   return( i ) ;
 229
 230 }
 231 /*============================================================================*/