drivers/staging/vt6655/tkip.c - kernel/skids - Git at Google

 /*
  * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
  * All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License along
  * with this program; if not, write to the Free Software Foundation, Inc.,
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  *
  * File: tkip.c
  *
  * Purpose: Implement functions for 802.11i TKIP
  *
  * Author: Jerry Chen
  *
  * Date: Mar. 11, 2003
  *
  * Functions:
  *      TKIPvMixKey - Get TKIP RC4 Key from TK,TA, and TSC
  *
  * Revision History:
  *
  */

 #include "tmacro.h"
 #include "tkip.h"

 /*---------------------  Static Definitions -------------------------*/

 /*---------------------  Static Classes  ----------------------------*/

 /*---------------------  Static Variables  --------------------------*/

 /*---------------------  Static Functions  --------------------------*/

 /*---------------------  Export Variables  --------------------------*/

 /*---------------------  Static Definitions -------------------------*/

 /*---------------------  Static Classes  ----------------------------*/

 /*---------------------  Static Variables  --------------------------*/

 /* The Sbox is reduced to 2 16-bit wide tables, each with 256 entries. */
 /* The 2nd table is the same as the 1st but with the upper and lower   */
 /* bytes swapped. To allow an endian tolerant implementation, the byte */
 /* halves have been expressed independently here.                      */
 const BYTE TKIP_Sbox_Lower[256] = {
     0xA5,0x84,0x99,0x8D,0x0D,0xBD,0xB1,0x54,
     0x50,0x03,0xA9,0x7D,0x19,0x62,0xE6,0x9A,
     0x45,0x9D,0x40,0x87,0x15,0xEB,0xC9,0x0B,
     0xEC,0x67,0xFD,0xEA,0xBF,0xF7,0x96,0x5B,
     0xC2,0x1C,0xAE,0x6A,0x5A,0x41,0x02,0x4F,
     0x5C,0xF4,0x34,0x08,0x93,0x73,0x53,0x3F,
     0x0C,0x52,0x65,0x5E,0x28,0xA1,0x0F,0xB5,
     0x09,0x36,0x9B,0x3D,0x26,0x69,0xCD,0x9F,
     0x1B,0x9E,0x74,0x2E,0x2D,0xB2,0xEE,0xFB,
     0xF6,0x4D,0x61,0xCE,0x7B,0x3E,0x71,0x97,
     0xF5,0x68,0x00,0x2C,0x60,0x1F,0xC8,0xED,
     0xBE,0x46,0xD9,0x4B,0xDE,0xD4,0xE8,0x4A,
     0x6B,0x2A,0xE5,0x16,0xC5,0xD7,0x55,0x94,
     0xCF,0x10,0x06,0x81,0xF0,0x44,0xBA,0xE3,
     0xF3,0xFE,0xC0,0x8A,0xAD,0xBC,0x48,0x04,
     0xDF,0xC1,0x75,0x63,0x30,0x1A,0x0E,0x6D,
     0x4C,0x14,0x35,0x2F,0xE1,0xA2,0xCC,0x39,
     0x57,0xF2,0x82,0x47,0xAC,0xE7,0x2B,0x95,
     0xA0,0x98,0xD1,0x7F,0x66,0x7E,0xAB,0x83,
     0xCA,0x29,0xD3,0x3C,0x79,0xE2,0x1D,0x76,
     0x3B,0x56,0x4E,0x1E,0xDB,0x0A,0x6C,0xE4,
     0x5D,0x6E,0xEF,0xA6,0xA8,0xA4,0x37,0x8B,
     0x32,0x43,0x59,0xB7,0x8C,0x64,0xD2,0xE0,
     0xB4,0xFA,0x07,0x25,0xAF,0x8E,0xE9,0x18,
     0xD5,0x88,0x6F,0x72,0x24,0xF1,0xC7,0x51,
     0x23,0x7C,0x9C,0x21,0xDD,0xDC,0x86,0x85,
     0x90,0x42,0xC4,0xAA,0xD8,0x05,0x01,0x12,
     0xA3,0x5F,0xF9,0xD0,0x91,0x58,0x27,0xB9,
     0x38,0x13,0xB3,0x33,0xBB,0x70,0x89,0xA7,
     0xB6,0x22,0x92,0x20,0x49,0xFF,0x78,0x7A,
     0x8F,0xF8,0x80,0x17,0xDA,0x31,0xC6,0xB8,
     0xC3,0xB0,0x77,0x11,0xCB,0xFC,0xD6,0x3A
 };

 const BYTE TKIP_Sbox_Upper[256] = {
     0xC6,0xF8,0xEE,0xF6,0xFF,0xD6,0xDE,0x91,
     0x60,0x02,0xCE,0x56,0xE7,0xB5,0x4D,0xEC,
     0x8F,0x1F,0x89,0xFA,0xEF,0xB2,0x8E,0xFB,
     0x41,0xB3,0x5F,0x45,0x23,0x53,0xE4,0x9B,
     0x75,0xE1,0x3D,0x4C,0x6C,0x7E,0xF5,0x83,
     0x68,0x51,0xD1,0xF9,0xE2,0xAB,0x62,0x2A,
     0x08,0x95,0x46,0x9D,0x30,0x37,0x0A,0x2F,
     0x0E,0x24,0x1B,0xDF,0xCD,0x4E,0x7F,0xEA,
     0x12,0x1D,0x58,0x34,0x36,0xDC,0xB4,0x5B,
     0xA4,0x76,0xB7,0x7D,0x52,0xDD,0x5E,0x13,
     0xA6,0xB9,0x00,0xC1,0x40,0xE3,0x79,0xB6,
     0xD4,0x8D,0x67,0x72,0x94,0x98,0xB0,0x85,
     0xBB,0xC5,0x4F,0xED,0x86,0x9A,0x66,0x11,
     0x8A,0xE9,0x04,0xFE,0xA0,0x78,0x25,0x4B,
     0xA2,0x5D,0x80,0x05,0x3F,0x21,0x70,0xF1,
     0x63,0x77,0xAF,0x42,0x20,0xE5,0xFD,0xBF,
     0x81,0x18,0x26,0xC3,0xBE,0x35,0x88,0x2E,
     0x93,0x55,0xFC,0x7A,0xC8,0xBA,0x32,0xE6,
     0xC0,0x19,0x9E,0xA3,0x44,0x54,0x3B,0x0B,
     0x8C,0xC7,0x6B,0x28,0xA7,0xBC,0x16,0xAD,
     0xDB,0x64,0x74,0x14,0x92,0x0C,0x48,0xB8,
     0x9F,0xBD,0x43,0xC4,0x39,0x31,0xD3,0xF2,
     0xD5,0x8B,0x6E,0xDA,0x01,0xB1,0x9C,0x49,
     0xD8,0xAC,0xF3,0xCF,0xCA,0xF4,0x47,0x10,
     0x6F,0xF0,0x4A,0x5C,0x38,0x57,0x73,0x97,
     0xCB,0xA1,0xE8,0x3E,0x96,0x61,0x0D,0x0F,
     0xE0,0x7C,0x71,0xCC,0x90,0x06,0xF7,0x1C,
     0xC2,0x6A,0xAE,0x69,0x17,0x99,0x3A,0x27,
     0xD9,0xEB,0x2B,0x22,0xD2,0xA9,0x07,0x33,
     0x2D,0x3C,0x15,0xC9,0x87,0xAA,0x50,0xA5,
     0x03,0x59,0x09,0x1A,0x65,0xD7,0x84,0xD0,
     0x82,0x29,0x5A,0x1E,0x7B,0xA8,0x6D,0x2C
 };


 //STKIPKeyManagement  sTKIPKeyTable[MAX_TKIP_KEY];

 /*---------------------  Static Functions  --------------------------*/
 unsigned int tkip_sbox(unsigned int index);
 unsigned int rotr1(unsigned int a);

 /*---------------------  Export Variables  --------------------------*/

 /************************************************************/
 /* tkip_sbox()                                              */
 /* Returns a 16 bit value from a 64K entry table. The Table */
 /* is synthesized from two 256 entry byte wide tables.      */
 /************************************************************/
 unsigned int tkip_sbox(unsigned int index)
 {
     unsigned int index_low;
     unsigned int index_high;
     unsigned int left, right;

     index_low = (index % 256);
     index_high = ((index >> 8) % 256);

     left = TKIP_Sbox_Lower[index_low] + (TKIP_Sbox_Upper[index_low] * 256);
     right = TKIP_Sbox_Upper[index_high] + (TKIP_Sbox_Lower[index_high] * 256);

     return (left ^ right);
 };


 unsigned int rotr1(unsigned int a)
 {
     unsigned int b;

     if ((a & 0x01) == 0x01) {
         b = (a >> 1) | 0x8000;
     } else {
         b = (a >> 1) & 0x7fff;
     }
     b = b % 65536;
     return b;
 }


 /*
  * Description: Caculate RC4Key fom TK, TA, and TSC
  *
  * Parameters:
  *  In:
  *      pbyTKey         - TKey
  *      pbyTA           - TA
  *      dwTSC           - TSC
  *  Out:
  *      pbyRC4Key       - RC4Key
  *
  * Return Value: none
  *
  */
 void TKIPvMixKey(
     PBYTE   pbyTKey,
     PBYTE   pbyTA,
     WORD    wTSC15_0,
     DWORD   dwTSC47_16,
     PBYTE   pbyRC4Key
     )
 {
     unsigned int p1k[5];
 //    unsigned int ttak0, ttak1, ttak2, ttak3, ttak4;
     unsigned int tsc0, tsc1, tsc2;
     unsigned int ppk0, ppk1, ppk2, ppk3, ppk4, ppk5;
     unsigned long int pnl,pnh;

     int i, j;

     pnl = wTSC15_0;
     pnh = dwTSC47_16;

     tsc0 = (unsigned int)((pnh >> 16) % 65536); /* msb */
     tsc1 = (unsigned int)(pnh % 65536);
     tsc2 = (unsigned int)(pnl % 65536); /* lsb */

     /* Phase 1, step 1 */
     p1k[0] = tsc1;
     p1k[1] = tsc0;
     p1k[2] = (unsigned int)(pbyTA[0] + (pbyTA[1]*256));
     p1k[3] = (unsigned int)(pbyTA[2] + (pbyTA[3]*256));
     p1k[4] = (unsigned int)(pbyTA[4] + (pbyTA[5]*256));

     /* Phase 1, step 2 */
     for (i=0; i<8; i++) {
         j = 2*(i & 1);
         p1k[0] = (p1k[0] + tkip_sbox( (p1k[4] ^ ((256*pbyTKey[1+j]) + pbyTKey[j])) % 65536 )) % 65536;
         p1k[1] = (p1k[1] + tkip_sbox( (p1k[0] ^ ((256*pbyTKey[5+j]) + pbyTKey[4+j])) % 65536 )) % 65536;
         p1k[2] = (p1k[2] + tkip_sbox( (p1k[1] ^ ((256*pbyTKey[9+j]) + pbyTKey[8+j])) % 65536 )) % 65536;
         p1k[3] = (p1k[3] + tkip_sbox( (p1k[2] ^ ((256*pbyTKey[13+j]) + pbyTKey[12+j])) % 65536 )) % 65536;
         p1k[4] = (p1k[4] + tkip_sbox( (p1k[3] ^ (((256*pbyTKey[1+j]) + pbyTKey[j]))) % 65536 )) % 65536;
         p1k[4] = (p1k[4] + i) % 65536;
     }
     /* Phase 2, Step 1 */
     ppk0 = p1k[0];
     ppk1 = p1k[1];
     ppk2 = p1k[2];
     ppk3 = p1k[3];
     ppk4 = p1k[4];
     ppk5 = (p1k[4] + tsc2) % 65536;

     /* Phase2, Step 2 */
     ppk0 = ppk0 + tkip_sbox( (ppk5 ^ ((256*pbyTKey[1]) + pbyTKey[0])) % 65536);
     ppk1 = ppk1 + tkip_sbox( (ppk0 ^ ((256*pbyTKey[3]) + pbyTKey[2])) % 65536);
     ppk2 = ppk2 + tkip_sbox( (ppk1 ^ ((256*pbyTKey[5]) + pbyTKey[4])) % 65536);
     ppk3 = ppk3 + tkip_sbox( (ppk2 ^ ((256*pbyTKey[7]) + pbyTKey[6])) % 65536);
     ppk4 = ppk4 + tkip_sbox( (ppk3 ^ ((256*pbyTKey[9]) + pbyTKey[8])) % 65536);
     ppk5 = ppk5 + tkip_sbox( (ppk4 ^ ((256*pbyTKey[11]) + pbyTKey[10])) % 65536);

     ppk0 = ppk0 + rotr1(ppk5 ^ ((256*pbyTKey[13]) + pbyTKey[12]));
     ppk1 = ppk1 + rotr1(ppk0 ^ ((256*pbyTKey[15]) + pbyTKey[14]));
     ppk2 = ppk2 + rotr1(ppk1);
     ppk3 = ppk3 + rotr1(ppk2);
     ppk4 = ppk4 + rotr1(ppk3);
     ppk5 = ppk5 + rotr1(ppk4);

     /* Phase 2, Step 3 */
     pbyRC4Key[0] = (tsc2 >> 8) % 256;
     pbyRC4Key[1] = (((tsc2 >> 8) % 256) | 0x20) & 0x7f;
     pbyRC4Key[2] = tsc2 % 256;
     pbyRC4Key[3] = ((ppk5 ^ ((256*pbyTKey[1]) + pbyTKey[0])) >> 1) % 256;

     pbyRC4Key[4] = ppk0 % 256;
     pbyRC4Key[5] = (ppk0 >> 8) % 256;

     pbyRC4Key[6] = ppk1 % 256;
     pbyRC4Key[7] = (ppk1 >> 8) % 256;

     pbyRC4Key[8] = ppk2 % 256;
     pbyRC4Key[9] = (ppk2 >> 8) % 256;

     pbyRC4Key[10] = ppk3 % 256;
     pbyRC4Key[11] = (ppk3 >> 8) % 256;

     pbyRC4Key[12] = ppk4 % 256;
     pbyRC4Key[13] = (ppk4 >> 8) % 256;

     pbyRC4Key[14] = ppk5 % 256;
     pbyRC4Key[15] = (ppk5 >> 8) % 256;
 }
	/*
	* Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
	* All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License along
	* with this program; if not, write to the Free Software Foundation, Inc.,
	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	*
	* File: tkip.c
	*
	* Purpose: Implement functions for 802.11i TKIP
	*
	* Author: Jerry Chen
	*
	* Date: Mar. 11, 2003
	*
	* Functions:
	* TKIPvMixKey - Get TKIP RC4 Key from TK,TA, and TSC
	*
	* Revision History:
	*
	*/

	#include "tmacro.h"
	#include "tkip.h"

	/--------------------- Static Definitions -------------------------/

	/--------------------- Static Classes ----------------------------/

	/--------------------- Static Variables --------------------------/

	/--------------------- Static Functions --------------------------/

	/--------------------- Export Variables --------------------------/

	/--------------------- Static Definitions -------------------------/

	/--------------------- Static Classes ----------------------------/

	/--------------------- Static Variables --------------------------/

	/* The Sbox is reduced to 2 16-bit wide tables, each with 256 entries. */
	/* The 2nd table is the same as the 1st but with the upper and lower */
	/* bytes swapped. To allow an endian tolerant implementation, the byte */
	/* halves have been expressed independently here. */
	const BYTE TKIP_Sbox_Lower[256] = {
	0xA5,0x84,0x99,0x8D,0x0D,0xBD,0xB1,0x54,
	0x50,0x03,0xA9,0x7D,0x19,0x62,0xE6,0x9A,
	0x45,0x9D,0x40,0x87,0x15,0xEB,0xC9,0x0B,
	0xEC,0x67,0xFD,0xEA,0xBF,0xF7,0x96,0x5B,
	0xC2,0x1C,0xAE,0x6A,0x5A,0x41,0x02,0x4F,
	0x5C,0xF4,0x34,0x08,0x93,0x73,0x53,0x3F,
	0x0C,0x52,0x65,0x5E,0x28,0xA1,0x0F,0xB5,
	0x09,0x36,0x9B,0x3D,0x26,0x69,0xCD,0x9F,
	0x1B,0x9E,0x74,0x2E,0x2D,0xB2,0xEE,0xFB,
	0xF6,0x4D,0x61,0xCE,0x7B,0x3E,0x71,0x97,
	0xF5,0x68,0x00,0x2C,0x60,0x1F,0xC8,0xED,
	0xBE,0x46,0xD9,0x4B,0xDE,0xD4,0xE8,0x4A,
	0x6B,0x2A,0xE5,0x16,0xC5,0xD7,0x55,0x94,
	0xCF,0x10,0x06,0x81,0xF0,0x44,0xBA,0xE3,
	0xF3,0xFE,0xC0,0x8A,0xAD,0xBC,0x48,0x04,
	0xDF,0xC1,0x75,0x63,0x30,0x1A,0x0E,0x6D,
	0x4C,0x14,0x35,0x2F,0xE1,0xA2,0xCC,0x39,
	0x57,0xF2,0x82,0x47,0xAC,0xE7,0x2B,0x95,
	0xA0,0x98,0xD1,0x7F,0x66,0x7E,0xAB,0x83,
	0xCA,0x29,0xD3,0x3C,0x79,0xE2,0x1D,0x76,
	0x3B,0x56,0x4E,0x1E,0xDB,0x0A,0x6C,0xE4,
	0x5D,0x6E,0xEF,0xA6,0xA8,0xA4,0x37,0x8B,
	0x32,0x43,0x59,0xB7,0x8C,0x64,0xD2,0xE0,
	0xB4,0xFA,0x07,0x25,0xAF,0x8E,0xE9,0x18,
	0xD5,0x88,0x6F,0x72,0x24,0xF1,0xC7,0x51,
	0x23,0x7C,0x9C,0x21,0xDD,0xDC,0x86,0x85,
	0x90,0x42,0xC4,0xAA,0xD8,0x05,0x01,0x12,
	0xA3,0x5F,0xF9,0xD0,0x91,0x58,0x27,0xB9,
	0x38,0x13,0xB3,0x33,0xBB,0x70,0x89,0xA7,
	0xB6,0x22,0x92,0x20,0x49,0xFF,0x78,0x7A,
	0x8F,0xF8,0x80,0x17,0xDA,0x31,0xC6,0xB8,
	0xC3,0xB0,0x77,0x11,0xCB,0xFC,0xD6,0x3A
	};

	const BYTE TKIP_Sbox_Upper[256] = {
	0xC6,0xF8,0xEE,0xF6,0xFF,0xD6,0xDE,0x91,
	0x60,0x02,0xCE,0x56,0xE7,0xB5,0x4D,0xEC,
	0x8F,0x1F,0x89,0xFA,0xEF,0xB2,0x8E,0xFB,
	0x41,0xB3,0x5F,0x45,0x23,0x53,0xE4,0x9B,
	0x75,0xE1,0x3D,0x4C,0x6C,0x7E,0xF5,0x83,
	0x68,0x51,0xD1,0xF9,0xE2,0xAB,0x62,0x2A,
	0x08,0x95,0x46,0x9D,0x30,0x37,0x0A,0x2F,
	0x0E,0x24,0x1B,0xDF,0xCD,0x4E,0x7F,0xEA,
	0x12,0x1D,0x58,0x34,0x36,0xDC,0xB4,0x5B,
	0xA4,0x76,0xB7,0x7D,0x52,0xDD,0x5E,0x13,
	0xA6,0xB9,0x00,0xC1,0x40,0xE3,0x79,0xB6,
	0xD4,0x8D,0x67,0x72,0x94,0x98,0xB0,0x85,
	0xBB,0xC5,0x4F,0xED,0x86,0x9A,0x66,0x11,
	0x8A,0xE9,0x04,0xFE,0xA0,0x78,0x25,0x4B,
	0xA2,0x5D,0x80,0x05,0x3F,0x21,0x70,0xF1,
	0x63,0x77,0xAF,0x42,0x20,0xE5,0xFD,0xBF,
	0x81,0x18,0x26,0xC3,0xBE,0x35,0x88,0x2E,
	0x93,0x55,0xFC,0x7A,0xC8,0xBA,0x32,0xE6,
	0xC0,0x19,0x9E,0xA3,0x44,0x54,0x3B,0x0B,
	0x8C,0xC7,0x6B,0x28,0xA7,0xBC,0x16,0xAD,
	0xDB,0x64,0x74,0x14,0x92,0x0C,0x48,0xB8,
	0x9F,0xBD,0x43,0xC4,0x39,0x31,0xD3,0xF2,
	0xD5,0x8B,0x6E,0xDA,0x01,0xB1,0x9C,0x49,
	0xD8,0xAC,0xF3,0xCF,0xCA,0xF4,0x47,0x10,
	0x6F,0xF0,0x4A,0x5C,0x38,0x57,0x73,0x97,
	0xCB,0xA1,0xE8,0x3E,0x96,0x61,0x0D,0x0F,
	0xE0,0x7C,0x71,0xCC,0x90,0x06,0xF7,0x1C,
	0xC2,0x6A,0xAE,0x69,0x17,0x99,0x3A,0x27,
	0xD9,0xEB,0x2B,0x22,0xD2,0xA9,0x07,0x33,
	0x2D,0x3C,0x15,0xC9,0x87,0xAA,0x50,0xA5,
	0x03,0x59,0x09,0x1A,0x65,0xD7,0x84,0xD0,
	0x82,0x29,0x5A,0x1E,0x7B,0xA8,0x6D,0x2C
	};


	//STKIPKeyManagement sTKIPKeyTable[MAX_TKIP_KEY];

	/--------------------- Static Functions --------------------------/
	unsigned int tkip_sbox(unsigned int index);
	unsigned int rotr1(unsigned int a);

	/--------------------- Export Variables --------------------------/

	/************************************************************/
	/* tkip_sbox() */
	/* Returns a 16 bit value from a 64K entry table. The Table */
	/* is synthesized from two 256 entry byte wide tables. */
	/************************************************************/
	unsigned int tkip_sbox(unsigned int index)
	{
	unsigned int index_low;
	unsigned int index_high;
	unsigned int left, right;

	index_low = (index % 256);
	index_high = ((index >> 8) % 256);

	left = TKIP_Sbox_Lower[index_low] + (TKIP_Sbox_Upper[index_low] * 256);
	right = TKIP_Sbox_Upper[index_high] + (TKIP_Sbox_Lower[index_high] * 256);

	return (left ^ right);
	};


	unsigned int rotr1(unsigned int a)
	{
	unsigned int b;

	if ((a & 0x01) == 0x01) {
	b = (a >> 1) \| 0x8000;
	} else {
	b = (a >> 1) & 0x7fff;
	}
	b = b % 65536;
	return b;
	}


	/*
	* Description: Caculate RC4Key fom TK, TA, and TSC
	*
	* Parameters:
	* In:
	* pbyTKey - TKey
	* pbyTA - TA
	* dwTSC - TSC
	* Out:
	* pbyRC4Key - RC4Key
	*
	* Return Value: none
	*
	*/
	void TKIPvMixKey(
	PBYTE pbyTKey,
	PBYTE pbyTA,
	WORD wTSC15_0,
	DWORD dwTSC47_16,
	PBYTE pbyRC4Key
	)
	{
	unsigned int p1k[5];
	// unsigned int ttak0, ttak1, ttak2, ttak3, ttak4;
	unsigned int tsc0, tsc1, tsc2;
	unsigned int ppk0, ppk1, ppk2, ppk3, ppk4, ppk5;
	unsigned long int pnl,pnh;

	int i, j;

	pnl = wTSC15_0;
	pnh = dwTSC47_16;

	tsc0 = (unsigned int)((pnh >> 16) % 65536); /* msb */
	tsc1 = (unsigned int)(pnh % 65536);
	tsc2 = (unsigned int)(pnl % 65536); /* lsb */

	/* Phase 1, step 1 */
	p1k[0] = tsc1;
	p1k[1] = tsc0;
	p1k[2] = (unsigned int)(pbyTA[0] + (pbyTA[1]*256));
	p1k[3] = (unsigned int)(pbyTA[2] + (pbyTA[3]*256));
	p1k[4] = (unsigned int)(pbyTA[4] + (pbyTA[5]*256));

	/* Phase 1, step 2 */
	for (i=0; i<8; i++) {
	j = 2*(i & 1);
	p1k[0] = (p1k[0] + tkip_sbox( (p1k[4] ^ ((256*pbyTKey[1+j]) + pbyTKey[j])) % 65536 )) % 65536;
	p1k[1] = (p1k[1] + tkip_sbox( (p1k[0] ^ ((256*pbyTKey[5+j]) + pbyTKey[4+j])) % 65536 )) % 65536;
	p1k[2] = (p1k[2] + tkip_sbox( (p1k[1] ^ ((256*pbyTKey[9+j]) + pbyTKey[8+j])) % 65536 )) % 65536;
	p1k[3] = (p1k[3] + tkip_sbox( (p1k[2] ^ ((256*pbyTKey[13+j]) + pbyTKey[12+j])) % 65536 )) % 65536;
	p1k[4] = (p1k[4] + tkip_sbox( (p1k[3] ^ (((256*pbyTKey[1+j]) + pbyTKey[j]))) % 65536 )) % 65536;
	p1k[4] = (p1k[4] + i) % 65536;
	}
	/* Phase 2, Step 1 */
	ppk0 = p1k[0];
	ppk1 = p1k[1];
	ppk2 = p1k[2];
	ppk3 = p1k[3];
	ppk4 = p1k[4];
	ppk5 = (p1k[4] + tsc2) % 65536;

	/* Phase2, Step 2 */
	ppk0 = ppk0 + tkip_sbox( (ppk5 ^ ((256*pbyTKey[1]) + pbyTKey[0])) % 65536);
	ppk1 = ppk1 + tkip_sbox( (ppk0 ^ ((256*pbyTKey[3]) + pbyTKey[2])) % 65536);
	ppk2 = ppk2 + tkip_sbox( (ppk1 ^ ((256*pbyTKey[5]) + pbyTKey[4])) % 65536);
	ppk3 = ppk3 + tkip_sbox( (ppk2 ^ ((256*pbyTKey[7]) + pbyTKey[6])) % 65536);
	ppk4 = ppk4 + tkip_sbox( (ppk3 ^ ((256*pbyTKey[9]) + pbyTKey[8])) % 65536);
	ppk5 = ppk5 + tkip_sbox( (ppk4 ^ ((256*pbyTKey[11]) + pbyTKey[10])) % 65536);

	ppk0 = ppk0 + rotr1(ppk5 ^ ((256*pbyTKey[13]) + pbyTKey[12]));
	ppk1 = ppk1 + rotr1(ppk0 ^ ((256*pbyTKey[15]) + pbyTKey[14]));
	ppk2 = ppk2 + rotr1(ppk1);
	ppk3 = ppk3 + rotr1(ppk2);
	ppk4 = ppk4 + rotr1(ppk3);
	ppk5 = ppk5 + rotr1(ppk4);

	/* Phase 2, Step 3 */
	pbyRC4Key[0] = (tsc2 >> 8) % 256;
	pbyRC4Key[1] = (((tsc2 >> 8) % 256) \| 0x20) & 0x7f;
	pbyRC4Key[2] = tsc2 % 256;
	pbyRC4Key[3] = ((ppk5 ^ ((256*pbyTKey[1]) + pbyTKey[0])) >> 1) % 256;

	pbyRC4Key[4] = ppk0 % 256;
	pbyRC4Key[5] = (ppk0 >> 8) % 256;

	pbyRC4Key[6] = ppk1 % 256;
	pbyRC4Key[7] = (ppk1 >> 8) % 256;

	pbyRC4Key[8] = ppk2 % 256;
	pbyRC4Key[9] = (ppk2 >> 8) % 256;

	pbyRC4Key[10] = ppk3 % 256;
	pbyRC4Key[11] = (ppk3 >> 8) % 256;

	pbyRC4Key[12] = ppk4 % 256;
	pbyRC4Key[13] = (ppk4 >> 8) % 256;

	pbyRC4Key[14] = ppk5 % 256;
	pbyRC4Key[15] = (ppk5 >> 8) % 256;
	}