drivers/staging/vt6656/tkip.c

   1 /*
   2  * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
   3  * All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  *
  20  * File: tkip.c
  21  *
  22  * Purpose: Implement functions for 802.11i TKIP
  23  *
  24  * Author: Jerry Chen
  25  *
  26  * Date: Mar. 11, 2003
  27  *
  28  * Functions:
  29  *      TKIPvMixKey - Get TKIP RC4 Key from TK,TA, and TSC
  30  *
  31  * Revision History:
  32  *
  33  */
  34
  35 #include "tmacro.h"
  36 #include "tkip.h"
  37
  38 /*---------------------  Static Definitions -------------------------*/
  39
  40 /*---------------------  Static Classes  ----------------------------*/
  41
  42 /*---------------------  Static Variables  --------------------------*/
  43
  44 /*---------------------  Static Functions  --------------------------*/
  45
  46 /*---------------------  Export Variables  --------------------------*/
  47
  48 /*---------------------  Static Definitions -------------------------*/
  49
  50 /*---------------------  Static Classes  ----------------------------*/
  51
  52 /*---------------------  Static Variables  --------------------------*/
  53
  54 /* The Sbox is reduced to 2 16-bit wide tables, each with 256 entries. */
  55 /* The 2nd table is the same as the 1st but with the upper and lower   */
  56 /* bytes swapped. To allow an endian tolerant implementation, the byte */
  57 /* halves have been expressed independently here.                      */
  58 const BYTE TKIP_Sbox_Lower[256] = {
  59     0xA5,0x84,0x99,0x8D,0x0D,0xBD,0xB1,0x54,
  60     0x50,0x03,0xA9,0x7D,0x19,0x62,0xE6,0x9A,
  61     0x45,0x9D,0x40,0x87,0x15,0xEB,0xC9,0x0B,
  62     0xEC,0x67,0xFD,0xEA,0xBF,0xF7,0x96,0x5B,
  63     0xC2,0x1C,0xAE,0x6A,0x5A,0x41,0x02,0x4F,
  64     0x5C,0xF4,0x34,0x08,0x93,0x73,0x53,0x3F,
  65     0x0C,0x52,0x65,0x5E,0x28,0xA1,0x0F,0xB5,
  66     0x09,0x36,0x9B,0x3D,0x26,0x69,0xCD,0x9F,
  67     0x1B,0x9E,0x74,0x2E,0x2D,0xB2,0xEE,0xFB,
  68     0xF6,0x4D,0x61,0xCE,0x7B,0x3E,0x71,0x97,
  69     0xF5,0x68,0x00,0x2C,0x60,0x1F,0xC8,0xED,
  70     0xBE,0x46,0xD9,0x4B,0xDE,0xD4,0xE8,0x4A,
  71     0x6B,0x2A,0xE5,0x16,0xC5,0xD7,0x55,0x94,
  72     0xCF,0x10,0x06,0x81,0xF0,0x44,0xBA,0xE3,
  73     0xF3,0xFE,0xC0,0x8A,0xAD,0xBC,0x48,0x04,
  74     0xDF,0xC1,0x75,0x63,0x30,0x1A,0x0E,0x6D,
  75     0x4C,0x14,0x35,0x2F,0xE1,0xA2,0xCC,0x39,
  76     0x57,0xF2,0x82,0x47,0xAC,0xE7,0x2B,0x95,
  77     0xA0,0x98,0xD1,0x7F,0x66,0x7E,0xAB,0x83,
  78     0xCA,0x29,0xD3,0x3C,0x79,0xE2,0x1D,0x76,
  79     0x3B,0x56,0x4E,0x1E,0xDB,0x0A,0x6C,0xE4,
  80     0x5D,0x6E,0xEF,0xA6,0xA8,0xA4,0x37,0x8B,
  81     0x32,0x43,0x59,0xB7,0x8C,0x64,0xD2,0xE0,
  82     0xB4,0xFA,0x07,0x25,0xAF,0x8E,0xE9,0x18,
  83     0xD5,0x88,0x6F,0x72,0x24,0xF1,0xC7,0x51,
  84     0x23,0x7C,0x9C,0x21,0xDD,0xDC,0x86,0x85,
  85     0x90,0x42,0xC4,0xAA,0xD8,0x05,0x01,0x12,
  86     0xA3,0x5F,0xF9,0xD0,0x91,0x58,0x27,0xB9,
  87     0x38,0x13,0xB3,0x33,0xBB,0x70,0x89,0xA7,
  88     0xB6,0x22,0x92,0x20,0x49,0xFF,0x78,0x7A,
  89     0x8F,0xF8,0x80,0x17,0xDA,0x31,0xC6,0xB8,
  90     0xC3,0xB0,0x77,0x11,0xCB,0xFC,0xD6,0x3A
  91 };
  92
  93 const BYTE TKIP_Sbox_Upper[256] = {
  94     0xC6,0xF8,0xEE,0xF6,0xFF,0xD6,0xDE,0x91,
  95     0x60,0x02,0xCE,0x56,0xE7,0xB5,0x4D,0xEC,
  96     0x8F,0x1F,0x89,0xFA,0xEF,0xB2,0x8E,0xFB,
  97     0x41,0xB3,0x5F,0x45,0x23,0x53,0xE4,0x9B,
  98     0x75,0xE1,0x3D,0x4C,0x6C,0x7E,0xF5,0x83,
  99     0x68,0x51,0xD1,0xF9,0xE2,0xAB,0x62,0x2A,
 100     0x08,0x95,0x46,0x9D,0x30,0x37,0x0A,0x2F,
 101     0x0E,0x24,0x1B,0xDF,0xCD,0x4E,0x7F,0xEA,
 102     0x12,0x1D,0x58,0x34,0x36,0xDC,0xB4,0x5B,
 103     0xA4,0x76,0xB7,0x7D,0x52,0xDD,0x5E,0x13,
 104     0xA6,0xB9,0x00,0xC1,0x40,0xE3,0x79,0xB6,
 105     0xD4,0x8D,0x67,0x72,0x94,0x98,0xB0,0x85,
 106     0xBB,0xC5,0x4F,0xED,0x86,0x9A,0x66,0x11,
 107     0x8A,0xE9,0x04,0xFE,0xA0,0x78,0x25,0x4B,
 108     0xA2,0x5D,0x80,0x05,0x3F,0x21,0x70,0xF1,
 109     0x63,0x77,0xAF,0x42,0x20,0xE5,0xFD,0xBF,
 110     0x81,0x18,0x26,0xC3,0xBE,0x35,0x88,0x2E,
 111     0x93,0x55,0xFC,0x7A,0xC8,0xBA,0x32,0xE6,
 112     0xC0,0x19,0x9E,0xA3,0x44,0x54,0x3B,0x0B,
 113     0x8C,0xC7,0x6B,0x28,0xA7,0xBC,0x16,0xAD,
 114     0xDB,0x64,0x74,0x14,0x92,0x0C,0x48,0xB8,
 115     0x9F,0xBD,0x43,0xC4,0x39,0x31,0xD3,0xF2,
 116     0xD5,0x8B,0x6E,0xDA,0x01,0xB1,0x9C,0x49,
 117     0xD8,0xAC,0xF3,0xCF,0xCA,0xF4,0x47,0x10,
 118     0x6F,0xF0,0x4A,0x5C,0x38,0x57,0x73,0x97,
 119     0xCB,0xA1,0xE8,0x3E,0x96,0x61,0x0D,0x0F,
 120     0xE0,0x7C,0x71,0xCC,0x90,0x06,0xF7,0x1C,
 121     0xC2,0x6A,0xAE,0x69,0x17,0x99,0x3A,0x27,
 122     0xD9,0xEB,0x2B,0x22,0xD2,0xA9,0x07,0x33,
 123     0x2D,0x3C,0x15,0xC9,0x87,0xAA,0x50,0xA5,
 124     0x03,0x59,0x09,0x1A,0x65,0xD7,0x84,0xD0,
 125     0x82,0x29,0x5A,0x1E,0x7B,0xA8,0x6D,0x2C
 126 };
 127
 128
 129 //STKIPKeyManagement  sTKIPKeyTable[MAX_TKIP_KEY];
 130
 131 /*---------------------  Static Functions  --------------------------*/
 132
 133 /*---------------------  Export Variables  --------------------------*/
 134
 135 /************************************************************/
 136 /* tkip_sbox()                                              */
 137 /* Returns a 16 bit value from a 64K entry table. The Table */
 138 /* is synthesized from two 256 entry byte wide tables.      */
 139 /************************************************************/
 140 static unsigned int tkip_sbox(unsigned int index)
 141 {
 142     unsigned int index_low;
 143     unsigned int index_high;
 144     unsigned int left, right;
 145
 146     index_low = (index % 256);
 147     index_high = ((index >> 8) % 256);
 148
 149     left = TKIP_Sbox_Lower[index_low] + (TKIP_Sbox_Upper[index_low] * 256);
 150     right = TKIP_Sbox_Upper[index_high] + (TKIP_Sbox_Lower[index_high] * 256);
 151
 152     return (left ^ right);
 153 };
 154
 155
 156 static unsigned int rotr1(unsigned int a)
 157 {
 158     unsigned int b;
 159
 160     if ((a & 0x01) == 0x01) {
 161         b = (a >> 1) | 0x8000;
 162     } else {
 163         b = (a >> 1) & 0x7fff;
 164     }
 165     b = b % 65536;
 166     return b;
 167 }
 168
 169
 170 /*
 171  * Description: Caculate RC4Key fom TK, TA, and TSC
 172  *
 173  * Parameters:
 174  *  In:
 175  *      pbyTKey         - TKey
 176  *      pbyTA           - TA
 177  *      dwTSC           - TSC
 178  *  Out:
 179  *      pbyRC4Key       - RC4Key
 180  *
 181  * Return Value: none
 182  *
 183  */
 184 void TKIPvMixKey(
 185     PBYTE   pbyTKey,
 186     PBYTE   pbyTA,
 187     WORD    wTSC15_0,
 188     DWORD   dwTSC47_16,
 189     PBYTE   pbyRC4Key
 190     )
 191 {
 192     unsigned int p1k[5];
 193 //    unsigned int ttak0, ttak1, ttak2, ttak3, ttak4;
 194     unsigned int tsc0, tsc1, tsc2;
 195     unsigned int ppk0, ppk1, ppk2, ppk3, ppk4, ppk5;
 196     unsigned long int pnl,pnh;
 197
 198     int i, j;
 199
 200     pnl = wTSC15_0;
 201     pnh = dwTSC47_16;
 202
 203     tsc0 = (unsigned int)((pnh >> 16) % 65536); /* msb */
 204     tsc1 = (unsigned int)(pnh % 65536);
 205     tsc2 = (unsigned int)(pnl % 65536); /* lsb */
 206
 207     /* Phase 1, step 1 */
 208     p1k[0] = tsc1;
 209     p1k[1] = tsc0;
 210     p1k[2] = (unsigned int)(pbyTA[0] + (pbyTA[1]*256));
 211     p1k[3] = (unsigned int)(pbyTA[2] + (pbyTA[3]*256));
 212     p1k[4] = (unsigned int)(pbyTA[4] + (pbyTA[5]*256));
 213
 214     /* Phase 1, step 2 */
 215     for (i=0; i<8; i++) {
 216         j = 2*(i & 1);
 217         p1k[0] = (p1k[0] + tkip_sbox((p1k[4] ^ ((256*pbyTKey[1+j]) + pbyTKey[j])) % 65536)) % 65536;
 218         p1k[1] = (p1k[1] + tkip_sbox((p1k[0] ^ ((256*pbyTKey[5+j]) + pbyTKey[4+j])) % 65536)) % 65536;
 219         p1k[2] = (p1k[2] + tkip_sbox((p1k[1] ^ ((256*pbyTKey[9+j]) + pbyTKey[8+j])) % 65536)) % 65536;
 220         p1k[3] = (p1k[3] + tkip_sbox((p1k[2] ^ ((256*pbyTKey[13+j]) + pbyTKey[12+j])) % 65536)) % 65536;
 221         p1k[4] = (p1k[4] + tkip_sbox((p1k[3] ^ (((256*pbyTKey[1+j]) + pbyTKey[j]))) % 65536)) % 65536;
 222         p1k[4] = (p1k[4] + i) % 65536;
 223     }
 224
 225     /* Phase 2, Step 1 */
 226     ppk0 = p1k[0];
 227     ppk1 = p1k[1];
 228     ppk2 = p1k[2];
 229     ppk3 = p1k[3];
 230     ppk4 = p1k[4];
 231     ppk5 = (p1k[4] + tsc2) % 65536;
 232
 233     /* Phase2, Step 2 */
 234         ppk0 = ppk0 + tkip_sbox((ppk5 ^ ((256*pbyTKey[1]) + pbyTKey[0])) % 65536);
 235         ppk1 = ppk1 + tkip_sbox((ppk0 ^ ((256*pbyTKey[3]) + pbyTKey[2])) % 65536);
 236         ppk2 = ppk2 + tkip_sbox((ppk1 ^ ((256*pbyTKey[5]) + pbyTKey[4])) % 65536);
 237         ppk3 = ppk3 + tkip_sbox((ppk2 ^ ((256*pbyTKey[7]) + pbyTKey[6])) % 65536);
 238         ppk4 = ppk4 + tkip_sbox((ppk3 ^ ((256*pbyTKey[9]) + pbyTKey[8])) % 65536);
 239         ppk5 = ppk5 + tkip_sbox((ppk4 ^ ((256*pbyTKey[11]) + pbyTKey[10])) % 65536);
 240
 241         ppk0 = ppk0 + rotr1(ppk5 ^ ((256*pbyTKey[13]) + pbyTKey[12]));
 242         ppk1 = ppk1 + rotr1(ppk0 ^ ((256*pbyTKey[15]) + pbyTKey[14]));
 243         ppk2 = ppk2 + rotr1(ppk1);
 244         ppk3 = ppk3 + rotr1(ppk2);
 245         ppk4 = ppk4 + rotr1(ppk3);
 246         ppk5 = ppk5 + rotr1(ppk4);
 247
 248     /* Phase 2, Step 3 */
 249     pbyRC4Key[0] = (tsc2 >> 8) % 256;
 250     pbyRC4Key[1] = (((tsc2 >> 8) % 256) | 0x20) & 0x7f;
 251     pbyRC4Key[2] = tsc2 % 256;
 252     pbyRC4Key[3] = ((ppk5 ^ ((256*pbyTKey[1]) + pbyTKey[0])) >> 1) % 256;
 253
 254     pbyRC4Key[4] = ppk0 % 256;
 255     pbyRC4Key[5] = (ppk0 >> 8) % 256;
 256
 257     pbyRC4Key[6] = ppk1 % 256;
 258     pbyRC4Key[7] = (ppk1 >> 8) % 256;
 259
 260     pbyRC4Key[8] = ppk2 % 256;
 261     pbyRC4Key[9] = (ppk2 >> 8) % 256;
 262
 263     pbyRC4Key[10] = ppk3 % 256;
 264     pbyRC4Key[11] = (ppk3 >> 8) % 256;
 265
 266     pbyRC4Key[12] = ppk4 % 256;
 267     pbyRC4Key[13] = (ppk4 >> 8) % 256;
 268
 269     pbyRC4Key[14] = ppk5 % 256;
 270     pbyRC4Key[15] = (ppk5 >> 8) % 256;
 271 }