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/drivers/staging/wlags49_h2/wl_enc.c

https://bitbucket.org/wisechild/galaxy-nexus
C | 232 lines | 74 code | 50 blank | 108 comment | 4 complexity | 028d3a35d5752e98777cf586b2f2d22b MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  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
 81extern 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 ******************************************************************************/
108int 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 ******************************************************************************/
185int 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/*============================================================================*/
232