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