1/* 2 * Copyright (c) 2007-2008 Atheros Communications Inc. 3 * 4 * Permission to use, copy, modify, and/or distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 */ 16/* */ 17/* Module Name : cwep.c */ 18/* */ 19/* Abstract */ 20/* This module contains Tx and Rx functions. */ 21/* */ 22/* NOTES */ 23/* None */ 24/* */ 25/************************************************************************/ 26#include "cprecomp.h" 27 28u32_t crc32_tab[] = 29{ 30 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L, 31 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L, 32 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L, 33 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL, 34 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L, 35 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L, 36 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L, 37 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL, 38 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L, 39 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL, 40 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L, 41 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L, 42 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L, 43 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL, 44 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL, 45 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L, 46 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL, 47 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L, 48 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L, 49 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L, 50 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL, 51 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L, 52 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L, 53 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL, 54 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L, 55 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L, 56 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L, 57 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L, 58 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L, 59 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL, 60 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL, 61 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L, 62 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L, 63 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL, 64 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL, 65 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L, 66 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL, 67 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L, 68 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL, 69 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L, 70 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL, 71 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L, 72 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L, 73 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL, 74 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L, 75 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L, 76 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L, 77 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L, 78 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L, 79 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L, 80 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL, 81 0x2d02ef8dL 82}; 83 84void zfWEPEncrypt(zdev_t *dev, zbuf_t *buf, u8_t *snap, u16_t snapLen, u16_t offset, u8_t keyLen, u8_t* WepKey, u8_t *iv) 85{ 86 u8_t S[256],S2[256]; 87 u16_t ui; 88 u16_t i; 89 u16_t j; 90 u8_t temp; 91 u8_t K; 92 u32_t ltemp; 93 u16_t len; 94 u32_t icv; 95 u8_t key[32]; 96 97 key[0] = iv[0]; 98 key[1] = iv[1]; 99 key[2] = iv[2]; 100 101 /* Append Wep Key after IV */ 102 zfMemoryCopy(&key[3], WepKey, keyLen); 103 104 keyLen += 3; 105 106 for(i = 0; i < 256; i++) 107 { 108 S[i] = (u8_t)i; 109 S2[i] = key[i&(keyLen-1)]; 110 } 111 112 j = 0; 113 for(i = 0; i < 256; i++) 114 { 115 j = (j + S[i] + S2[i]) ; 116 j&=255 ; 117 118 // Swap S[i] and S[j] 119 temp = S[i]; 120 S[i] = S[j]; 121 S[j] = temp; 122 } 123 124 i = j = 0; 125 icv = -1; 126 127 /* For Snap Header */ 128 for (ui = 0; ui < snapLen; ui++) 129 { 130 u8_t In; 131 132 i++; 133 i &= 255; 134 j += S[i]; 135 j &= 255; 136 137 // Swap S[i] and S[j] 138 temp = S[i]; 139 S[i] = S[j]; 140 S[j] = temp; 141// temp = (S[i] + temp) & 255; 142 temp += S[i]; 143 temp &=255; 144 K = S[temp]; // Key used to Xor with input data 145 146 In = snap[ui]; 147 icv = (icv>>8) ^ crc32_tab[(icv^In)&0xff]; 148 149 snap[ui] = In ^ K; 150 //zmw_tx_buf_writeb(dev, buf, ui, In ^ K); 151 } 152 153 len = zfwBufGetSize(dev, buf); 154 155 for (ui = offset; ui < len; ui++) 156 { 157 u8_t In; 158 159 i++; 160 i &= 255; 161 j += S[i]; 162 j &= 255; 163 164 // Swap S[i] and S[j] 165 temp = S[i]; 166 S[i] = S[j]; 167 S[j] = temp; 168// temp = (S[i] + temp) & 255; 169 temp += S[i]; 170 temp &=255; 171 K = S[temp]; // Key used to Xor with input data 172 173 In = zmw_tx_buf_readb(dev, buf, ui); 174 icv = (icv>>8) ^ crc32_tab[(icv^In)&0xff]; 175 176 zmw_tx_buf_writeb(dev, buf, ui, In ^ K); 177 } //End of for (ui = 0; ui < Num_Bytes; ui++) 178 179 icv = ~(icv); 180 ltemp = (u32_t) icv; 181 182 for (ui = 0; ui < 4; ui++) 183 { 184 i ++; 185 i &= 255; 186 j += S[i]; 187 j &= 255; 188 189 // Swap S[i] and S[j] 190 temp = S[i]; 191 S[i] = S[j]; 192 S[j] = temp; 193 temp += S[i]; 194 temp &= 255; 195 K = S[temp]; // Key used to Xor with input data 196 197 //*Out++ = (u8_t)(ltemp ^ K)&0xff; 198 zmw_tx_buf_writeb(dev, buf, len+ui, (u8_t)(ltemp ^ K)&0xff); 199 ltemp >>= 8; 200 } 201 202 zfwBufSetSize(dev, buf, len+4); 203} 204 205u16_t zfWEPDecrypt(zdev_t *dev, zbuf_t *buf, u16_t offset, u8_t keyLen, u8_t* WepKey, u8_t *iv) 206{ 207 u8_t S[256]; 208 u8_t S2[256]; 209 u16_t ui; 210 u16_t i; 211 u16_t j; 212 u32_t icv_tmp; 213 u32_t *icv; 214 u32_t rxbuf_icv; 215 u8_t temp; 216 u8_t K; 217 u16_t len; 218 u8_t key[32]; 219 220 /* Retrieve IV */ 221 key[0] = iv[0]; 222 key[1] = iv[1]; 223 key[2] = iv[2]; 224 225 /* Append Wep Key after IV */ 226 zfMemoryCopy(&key[3], WepKey, keyLen); 227 228 keyLen += 3; 229 230 for(i = 0; i < 256; i++) 231 { 232 S[i] = (u8_t)i; 233 S2[i] = key[i&(keyLen-1)]; 234 } 235 236 j = 0; 237 for(i = 0; i < 256; i++) 238 { 239 j = (j + S[i] + S2[i]); 240 j&=255 ; 241 242 // Swap S[i] and S[j] 243 temp = S[i]; 244 S[i] = S[j]; 245 S[j] = temp; 246 } 247 248 i = j = 0; 249 250 len = zfwBufGetSize(dev, buf); 251 252 for (ui = offset; ui < len; ui++) 253 { 254 u8_t In; 255 256 i++; 257 i &= 255; 258 j += S[i]; 259 j &= 255; 260 261 // Swap S[i] and S[j] 262 temp = S[i]; 263 S[i] = S[j]; 264 S[j] = temp; 265// temp = (S[i] + temp) & 255; 266 temp += S[i]; 267 temp &=255; 268 K = S[temp]; // Key used to Xor with input data 269 270 In = zmw_rx_buf_readb(dev, buf, ui); 271 272 zmw_rx_buf_writeb(dev, buf, ui, In ^ K); 273 } //End of for (ui = 0; ui < Num_Bytes; ui++) 274 275 icv = &icv_tmp; 276 *icv = -1; 277 278 for (ui = offset; ui < len - 4; ui++) 279 { 280 u8_t In; 281 282 In = zmw_rx_buf_readb(dev, buf, ui); 283 *icv = (*icv>>8) ^ crc32_tab[(*icv^In)&0xff]; 284 } 285 286 *icv = ~*icv; 287 288 rxbuf_icv = (zmw_rx_buf_readb(dev, buf, len-4) | 289 zmw_rx_buf_readb(dev, buf, len-3) << 8 | 290 zmw_rx_buf_readb(dev, buf, len-2) << 16 | 291 zmw_rx_buf_readb(dev, buf, len-1) << 24); 292 293 if (*icv != rxbuf_icv) 294 { 295 return ZM_ICV_FAILURE; 296 } 297 298 return ZM_ICV_SUCCESS; 299} 300