| 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 | |