drivers/net/wireless/rtlink/rtmp_wep.c

   1 /*************************************************************************
   2  * Ralink Tech Inc.                                                      *
   3  * 4F, No. 2 Technology 5th Rd.                                          *
   4  * Science-based Industrial Park                                         *
   5  * Hsin-chu, Taiwan, R.O.C.                                              *
   6  *                                                                       *
   7  * (c) Copyright 2002, Ralink Technology, Inc.                           *
   8  *                                                                       *
   9  * This program is free software; you can redistribute it and/or modify  *
  10  * it under the terms of the GNU General Public License as published by  *
  11  * the Free Software Foundation; either version 2 of the License, or     *
  12  * (at your option) any later version.                                   *
  13  *                                                                       *
  14  * This program is distributed in the hope that it will be useful,       *
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  17  * GNU General Public License for more details.                          *
  18  *                                                                       *
  19  * You should have received a copy of the GNU General Public License     *
  20  * along with this program; if not, write to the                         *
  21  * Free Software Foundation, Inc.,                                       *
  22  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  23  *                                                                       *
  24  *************************************************************************
  25
  26     Module Name:
  27     rtmp_wep.c
  28
  29     Abstract:
  30
  31     Revision History:
  32     Who         When            What
  33     --------    ----------      ----------------------------------------------
  34     Paul Wu     10-28-02        Initial
  35 */
  36
  37 #include    "rt_config.h"
  38
  39 ULONG FCSTAB_32[256] =
  40 {
  41     0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
  42     0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
  43     0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
  44     0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
  45     0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
  46     0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
  47     0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
  48     0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
  49     0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
  50     0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
  51     0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
  52     0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
  53     0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
  54     0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
  55     0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
  56     0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
  57     0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
  58     0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
  59     0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
  60     0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
  61     0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
  62     0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
  63     0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
  64     0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
  65     0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
  66     0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
  67     0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
  68     0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
  69     0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
  70     0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
  71     0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
  72     0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
  73     0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
  74     0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
  75     0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
  76     0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
  77     0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
  78     0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
  79     0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
  80     0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
  81     0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
  82     0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
  83     0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
  84     0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
  85     0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
  86     0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
  87     0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
  88     0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
  89     0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
  90     0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
  91     0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
  92     0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
  93     0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
  94     0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
  95     0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
  96     0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
  97     0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
  98     0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
  99     0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
 100     0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
 101     0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
 102     0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
 103     0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
 104     0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
 105 };
 106
 107 UCHAR   WEPKEY[] = {
 108         //IV
 109         0x00, 0x11, 0x22,
 110         //WEP KEY
 111         0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC
 112     };
 113
 114
 115 /*
 116     ========================================================================
 117
 118     Routine Description:
 119         Init WEP function.
 120
 121     Arguments:
 122       pAdapter      Pointer to our adapter
 123         pKey        Pointer to the WEP KEY
 124         KeyId       WEP Key ID
 125         KeyLen      the length of WEP KEY
 126         pDest       Pointer to the destination which Encryption data will store in.
 127
 128     Return Value:
 129         None
 130
 131     Note:
 132
 133     ========================================================================
 134 */
 135 VOID    RTMPInitWepEngine(
 136     IN  PRTMP_ADAPTER   pAdapter,
 137     IN  PUCHAR          pKey,
 138     IN  UCHAR           KeyId,
 139     IN  UCHAR           KeyLen,
 140     IN OUT  PUCHAR      pDest)
 141 {
 142     UINT i;
 143
 144     pAdapter->PrivateInfo.FCSCRC32 = PPPINITFCS32;   //Init crc32.
 145     NdisMoveMemory(WEPKEY + 3, pKey, KeyLen);
 146
 147     for(i = 0; i < 3; i++)
 148         WEPKEY[i] = RandomByte(pAdapter);   //Call mlme RandomByte() function.
 149     ARCFOUR_INIT(&pAdapter->PrivateInfo.WEPCONTEXT, WEPKEY, KeyLen + 3);  //INIT SBOX, KEYLEN+3(IV)
 150
 151     NdisMoveMemory(pDest, WEPKEY, 3);  //Append Init Vector
 152     *(pDest+3) = (KeyId << 6);       //Append KEYID
 153
 154 }
 155
 156 /*
 157     ========================================================================
 158
 159     Routine Description:
 160         Encrypt transimitted data
 161
 162     Arguments:
 163       pAdapter      Pointer to our adapter
 164       pSrc          Pointer to the transimitted source data that will be encrypt
 165       pDest         Pointer to the destination where entryption data will be store in.
 166       Len           Indicate the length of the source data
 167
 168     Return Value:
 169       None
 170
 171     Note:
 172
 173     ========================================================================
 174 */
 175 VOID    RTMPEncryptData(
 176     IN  PRTMP_ADAPTER   pAdapter,
 177     IN  PUCHAR          pSrc,
 178     IN  PUCHAR          pDest,
 179     IN  UINT            Len)
 180 {
 181     pAdapter->PrivateInfo.FCSCRC32 = RTMP_CALC_FCS32(pAdapter->PrivateInfo.FCSCRC32, pSrc, Len);
 182     ARCFOUR_ENCRYPT(&pAdapter->PrivateInfo.WEPCONTEXT, pDest, pSrc, Len);
 183 }
 184
 185 /*
 186     ========================================================================
 187
 188     Routine Description:
 189         Decrypt received data
 190
 191     Arguments:
 192         pAdapter        Pointer to our adapter
 193         pSrc        Pointer to the received data
 194         Len         the length of the received data
 195
 196     Return Value:
 197         TRUE        Decrypt WEP data success
 198         FALSE       Decrypt WEP data failed
 199
 200     Note:
 201
 202     ========================================================================
 203 */
 204 BOOLEAN RTMPDecryptData(
 205     IN  PRTMP_ADAPTER   pAdapter,
 206     IN  PUCHAR          pSrc,
 207     IN  UINT            Len)
 208 {
 209     ULONG   trailfcs;
 210     ULONG   crc32;
 211     UCHAR   KeyIdx;
 212
 213     NdisMoveMemory(WEPKEY, pSrc, 3);    //Get WEP IV
 214
 215     KeyIdx = (*(pSrc + 3) & 0xc0) >> 6;
 216     if (pAdapter->PortCfg.SharedKey[KeyIdx].KeyLen == 0)
 217         return (FALSE);
 218
 219     NdisMoveMemory(WEPKEY + 3, pAdapter->PortCfg.SharedKey[KeyIdx].Key, pAdapter->PortCfg.SharedKey[KeyIdx].KeyLen);
 220     ARCFOUR_INIT(&pAdapter->PrivateInfo.WEPCONTEXT, WEPKEY, pAdapter->PortCfg.SharedKey[KeyIdx].KeyLen + 3);
 221     ARCFOUR_DECRYPT(&pAdapter->PrivateInfo.WEPCONTEXT, pSrc, pSrc + 4, Len - 4);
 222     NdisMoveMemory(&trailfcs, pSrc + Len - 8, 4);
 223     crc32 = RTMP_CALC_FCS32(PPPINITFCS32, pSrc, Len - 8);  //Skip last 4 bytes(FCS).
 224     crc32 ^= 0xffffffff;             /* complement */
 225 #ifndef BIG_ENDIAN
 226     if(crc32 != trailfcs)
 227 #else
 228     if(crc32 != SWAP32(trailfcs))
 229 #endif
 230     {
 231         DBGPRINT(RT_DEBUG_TRACE, "! WEP Data CRC Error !\n");    //CRC error.
 232         return (FALSE);
 233     }
 234     return (TRUE);
 235 }
 236
 237 /*
 238     ========================================================================
 239
 240     Routine Description:
 241         The Stream Cipher Encryption Algorithm "ARCFOUR" initialize
 242
 243     Arguments:
 244        Ctx         Pointer to ARCFOUR CONTEXT (SBOX)
 245         pKey        Pointer to the WEP KEY
 246         KeyLen      Indicate the length fo the WEP KEY
 247
 248     Return Value:
 249        None
 250
 251     Note:
 252
 253     ========================================================================
 254 */
 255 VOID    ARCFOUR_INIT(
 256     IN  PARCFOURCONTEXT Ctx,
 257     IN  PUCHAR          pKey,
 258     IN  UINT            KeyLen)
 259 {
 260     UCHAR   t, u;
 261     UINT    keyindex;
 262     UINT    stateindex;
 263     PUCHAR  state;
 264     UINT    counter;
 265
 266     state = Ctx->STATE;
 267     Ctx->X = 0;
 268     Ctx->Y = 0;
 269     for (counter = 0; counter < 256; counter++)
 270         state[counter] = (UCHAR)counter;
 271     keyindex = 0;
 272     stateindex = 0;
 273     for (counter = 0; counter < 256; counter++)
 274     {
 275         t = state[counter];
 276         stateindex = (stateindex + pKey[keyindex] + t) & 0xff;
 277         u = state[stateindex];
 278         state[stateindex] = t;
 279         state[counter] = u;
 280         if (++keyindex >= KeyLen)
 281             keyindex = 0;
 282     }
 283 }
 284
 285 /*
 286     ========================================================================
 287
 288     Routine Description:
 289         Get bytes from ARCFOUR CONTEXT (S-BOX)
 290
 291     Arguments:
 292        Ctx         Pointer to ARCFOUR CONTEXT (SBOX)
 293
 294     Return Value:
 295        UCHAR  - the value of the ARCFOUR CONTEXT (S-BOX)
 296
 297     Note:
 298
 299     ========================================================================
 300 */
 301 UCHAR   ARCFOUR_BYTE(
 302     IN  PARCFOURCONTEXT     Ctx)
 303 {
 304   UINT x;
 305   UINT y;
 306   UCHAR sx, sy;
 307   PUCHAR state;
 308
 309   state = Ctx->STATE;
 310   x = (Ctx->X + 1) & 0xff;
 311   sx = state[x];
 312   y = (sx + Ctx->Y) & 0xff;
 313   sy = state[y];
 314   Ctx->X = x;
 315   Ctx->Y = y;
 316   state[y] = sx;
 317   state[x] = sy;
 318
 319   return(state[(sx + sy) & 0xff]);
 320
 321 }
 322
 323 /*
 324     ========================================================================
 325
 326     Routine Description:
 327         The Stream Cipher Decryption Algorithm
 328
 329     Arguments:
 330         Ctx         Pointer to ARCFOUR CONTEXT (SBOX)
 331         pDest           Pointer to the Destination
 332         pSrc        Pointer to the Source data
 333         Len         Indicate the length of the Source data
 334
 335     Return Value:
 336         None
 337
 338     Note:
 339
 340     ========================================================================
 341 */
 342 VOID    ARCFOUR_DECRYPT(
 343     IN  PARCFOURCONTEXT Ctx,
 344     IN  PUCHAR          pDest,
 345     IN  PUCHAR          pSrc,
 346     IN  UINT            Len)
 347 {
 348     UINT i;
 349
 350     for (i = 0; i < Len; i++)
 351         pDest[i] = pSrc[i] ^ ARCFOUR_BYTE(Ctx);
 352 }
 353
 354 /*
 355     ========================================================================
 356
 357     Routine Description:
 358         The Stream Cipher Encryption Algorithm
 359
 360     Arguments:
 361         Ctx         Pointer to ARCFOUR CONTEXT (SBOX)
 362         pDest           Pointer to the Destination
 363         pSrc        Pointer to the Source data
 364         Len         Indicate the length of the Source dta
 365
 366     Return Value:
 367         None
 368
 369     Note:
 370
 371     ========================================================================
 372 */
 373 VOID    ARCFOUR_ENCRYPT(
 374     IN  PARCFOURCONTEXT Ctx,
 375     IN  PUCHAR          pDest,
 376     IN  PUCHAR          pSrc,
 377     IN  UINT            Len)
 378 {
 379     UINT i;
 380
 381     for (i = 0; i < Len; i++)
 382         pDest[i] = pSrc[i] ^ ARCFOUR_BYTE(Ctx);
 383 }
 384
 385 /*
 386     ========================================================================
 387
 388     Routine Description:
 389         Calculate a new FCS given the current FCS and the new data.
 390
 391     Arguments:
 392         Fcs       the original FCS value
 393         Cp          pointer to the data which will be calculate the FCS
 394         Len         the length of the data
 395
 396     Return Value:
 397         ULONG - FCS 32 bits
 398
 399     Note:
 400
 401     ========================================================================
 402 */
 403 ULONG   RTMP_CALC_FCS32(
 404     IN  ULONG   Fcs,
 405     IN  PUCHAR  Cp,
 406     IN  INT     Len)
 407 {
 408     while (Len--)
 409        Fcs = (((Fcs) >> 8) ^ FCSTAB_32[((Fcs) ^ (*Cp++)) & 0xff]);
 410
 411     return (Fcs);
 412 }
 413
 414
 415 /*
 416     ========================================================================
 417
 418     Routine Description:
 419         Get last FCS and encrypt it to the destination
 420
 421     Arguments:
 422         pDest           Pointer to the Destination
 423
 424     Return Value:
 425         None
 426
 427     Note:
 428
 429     ========================================================================
 430 */
 431 VOID    RTMPSetICV(
 432     IN  PRTMP_ADAPTER   pAdapter,
 433     IN  PUCHAR  pDest)
 434 {
 435     pAdapter->PrivateInfo.FCSCRC32 ^= 0xffffffff;             /* complement */
 436
 437 #ifdef BIG_ENDIAN
 438     pAdapter->PrivateInfo.FCSCRC32 = SWAP32(pAdapter->PrivateInfo.FCSCRC32);
 439 #endif
 440
 441     ARCFOUR_ENCRYPT(&pAdapter->PrivateInfo.WEPCONTEXT, pDest, (PUCHAR) &pAdapter->PrivateInfo.FCSCRC32, 4);
 442 }
 443