/drivers/staging/wlags49_h2/wl_enc.c
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