drivers/staging/otus/80211core/cwep.c

   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
  28 u32_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
  84 void 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
 205 u16_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 }