path: root/drivers/staging/rt2860/common/cmm_tkip.c

/*
 *************************************************************************
 * Ralink Tech Inc.
 * 5F., No.36, Taiyuan St., Jhubei City,
 * Hsinchu County 302,
 * Taiwan, R.O.C.
 *
 * (c) Copyright 2002-2007, Ralink Technology, Inc.
 *
 * 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.,                                       *
 * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 *                                                                       *
 *************************************************************************

	Module Name:
	cmm_tkip.c

	Abstract:

	Revision History:
	Who			When			What
	--------	----------		----------------------------------------------
	Paul Wu		02-25-02		Initial
*/

#include	"../rt_config.h"

/* Rotation functions on 32 bit values */
#define ROL32( A, n ) \
	( ((A) << (n)) | ( ((A)>>(32-(n))) & ( (1UL << (n)) - 1 ) ) )
#define ROR32( A, n ) ROL32( (A), 32-(n) )

UINT 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
};

UINT 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
};

/* */
/* Expanded IV for TKIP function. */
/* */
typedef struct PACKED _IV_CONTROL_ {
	union PACKED {
		struct PACKED {
			UCHAR rc0;
			UCHAR rc1;
			UCHAR rc2;

			union PACKED {
				struct PACKED {
					UCHAR Rsvd:5;
					UCHAR ExtIV:1;
					UCHAR KeyID:2;
				} field;
				UCHAR Byte;
			} CONTROL;
		} field;

		ULONG word;
	} IV16;

	ULONG IV32;
} TKIP_IV, *PTKIP_IV;

/*
	========================================================================

	Routine	Description:
		Convert from UCHAR[] to ULONG in a portable way

	Arguments:
      pMICKey		pointer to MIC Key

	Return Value:
		None

	Note:

	========================================================================
*/
ULONG RTMPTkipGetUInt32(IN PUCHAR pMICKey)
{
	ULONG res = 0;
	INT i;

	for (i = 0; i < 4; i++) {
		res |= (*pMICKey++) << (8 * i);
	}

	return res;
}

/*
	========================================================================

	Routine	Description:
		Convert from ULONG to UCHAR[] in a portable way

	Arguments:
      pDst			pointer to destination for convert ULONG to UCHAR[]
      val			the value for convert

	Return Value:
		None

	IRQL = DISPATCH_LEVEL

	Note:

	========================================================================
*/
VOID RTMPTkipPutUInt32(IN OUT PUCHAR pDst, IN ULONG val)
{
	INT i;

	for (i = 0; i < 4; i++) {
		*pDst++ = (UCHAR) (val & 0xff);
		val >>= 8;
	}
}

/*
	========================================================================

	Routine	Description:
		Set the MIC Key.

	Arguments:
      pAd		Pointer to our adapter
      pMICKey		pointer to MIC Key

	Return Value:
		None

	IRQL = DISPATCH_LEVEL

	Note:

	========================================================================
*/
VOID RTMPTkipSetMICKey(IN PTKIP_KEY_INFO pTkip, IN PUCHAR pMICKey)
{
	/* Set the key */
	pTkip->K0 = RTMPTkipGetUInt32(pMICKey);
	pTkip->K1 = RTMPTkipGetUInt32(pMICKey + 4);
	/* and reset the message */
	pTkip->L = pTkip->K0;
	pTkip->R = pTkip->K1;
	pTkip->nBytesInM = 0;
	pTkip->M = 0;
}

/*
	========================================================================

	Routine	Description:
		Calculate the MIC Value.

	Arguments:
      pAd		Pointer to our adapter
      uChar			Append this uChar

	Return Value:
		None

	IRQL = DISPATCH_LEVEL

	Note:

	========================================================================
*/
VOID RTMPTkipAppendByte(IN PTKIP_KEY_INFO pTkip, IN UCHAR uChar)
{
	/* Append the byte to our word-sized buffer */
	pTkip->M |= (uChar << (8 * pTkip->nBytesInM));
	pTkip->nBytesInM++;
	/* Process the word if it is full. */
	if (pTkip->nBytesInM >= 4) {
		pTkip->L ^= pTkip->M;
		pTkip->R ^= ROL32(pTkip->L, 17);
		pTkip->L += pTkip->R;
		pTkip->R ^=
		    ((pTkip->L & 0xff00ff00) >> 8) | ((pTkip->
						       L & 0x00ff00ff) << 8);
		pTkip->L += pTkip->R;
		pTkip->R ^= ROL32(pTkip->L, 3);
		pTkip->L += pTkip->R;
		pTkip->R ^= ROR32(pTkip->L, 2);
		pTkip->L += pTkip->R;
		/* Clear the buffer */
		pTkip->M = 0;
		pTkip->nBytesInM = 0;
	}
}

/*
	========================================================================

	Routine	Description:
		Calculate the MIC Value.

	Arguments:
      pAd		Pointer to our adapter
      pSrc			Pointer to source data for Calculate MIC Value
      Len			Indicate the length of the source data

	Return Value:
		None

	IRQL = DISPATCH_LEVEL

	Note:

	========================================================================
*/
VOID RTMPTkipAppend(IN PTKIP_KEY_INFO pTkip, IN PUCHAR pSrc, IN UINT nBytes)
{
	/* This is simple */
	while (nBytes > 0) {
		RTMPTkipAppendByte(pTkip, *pSrc++);
		nBytes--;
	}
}

/*
	========================================================================

	Routine	Description:
		Get the MIC Value.

	Arguments:
      pAd		Pointer to our adapter

	Return Value:
		None

	IRQL = DISPATCH_LEVEL

	Note:
		the MIC Value is store in pAd->PrivateInfo.MIC
	========================================================================
*/
VOID RTMPTkipGetMIC(IN PTKIP_KEY_INFO pTkip)
{
	/* Append the minimum padding */
	RTMPTkipAppendByte(pTkip, 0x5a);
	RTMPTkipAppendByte(pTkip, 0);
	RTMPTkipAppendByte(pTkip, 0);
	RTMPTkipAppendByte(pTkip, 0);
	RTMPTkipAppendByte(pTkip, 0);
	/* and then zeroes until the length is a multiple of 4 */
	while (pTkip->nBytesInM != 0) {
		RTMPTkipAppendByte(pTkip, 0);
	}
	/* The appendByte function has already computed the result. */
	RTMPTkipPutUInt32(pTkip->MIC, pTkip->L);
	RTMPTkipPutUInt32(pTkip->MIC + 4, pTkip->R);
}

/*
	========================================================================

	Routine	Description:
		Init Tkip function.

	Arguments:
      pAd		Pointer to our adapter
		pTKey       Pointer to the Temporal Key (TK), TK shall be 128bits.
		KeyId		TK Key ID
		pTA			Pointer to transmitter address
		pMICKey		pointer to MIC Key

	Return Value:
		None

	IRQL = DISPATCH_LEVEL

	Note:

	========================================================================
*/
VOID RTMPInitTkipEngine(IN PRTMP_ADAPTER pAd,
			IN PUCHAR pKey,
			IN UCHAR KeyId,
			IN PUCHAR pTA,
			IN PUCHAR pMICKey,
			IN PUCHAR pTSC, OUT PULONG pIV16, OUT PULONG pIV32)
{
	TKIP_IV tkipIv;

	/* Prepare 8 bytes TKIP encapsulation for MPDU */
	NdisZeroMemory(&tkipIv, sizeof(TKIP_IV));
	tkipIv.IV16.field.rc0 = *(pTSC + 1);
	tkipIv.IV16.field.rc1 = (tkipIv.IV16.field.rc0 | 0x20) & 0x7f;
	tkipIv.IV16.field.rc2 = *pTSC;
	tkipIv.IV16.field.CONTROL.field.ExtIV = 1;	/* 0: non-extended IV, 1: an extended IV */
	tkipIv.IV16.field.CONTROL.field.KeyID = KeyId;
/*      tkipIv.IV32 = *(PULONG)(pTSC + 2); */
	NdisMoveMemory(&tkipIv.IV32, (pTSC + 2), 4);	/* Copy IV */

	*pIV16 = tkipIv.IV16.word;
	*pIV32 = tkipIv.IV32;
}

/*
	========================================================================

	Routine	Description:
		Init MIC Value calculation function which include set MIC key &
		calculate first 16 bytes (DA + SA + priority +  0)

	Arguments:
      pAd		Pointer to our adapter
		pTKey       Pointer to the Temporal Key (TK), TK shall be 128bits.
		pDA			Pointer to DA address
		pSA			Pointer to SA address
		pMICKey		pointer to MIC Key

	Return Value:
		None

	Note:

	========================================================================
*/
VOID RTMPInitMICEngine(IN PRTMP_ADAPTER pAd,
		       IN PUCHAR pKey,
		       IN PUCHAR pDA,
		       IN PUCHAR pSA, IN UCHAR UserPriority, IN PUCHAR pMICKey)
{
	ULONG Priority = UserPriority;

	/* Init MIC value calculation */
	RTMPTkipSetMICKey(&pAd->PrivateInfo.Tx, pMICKey);
	/* DA */
	RTMPTkipAppend(&pAd->PrivateInfo.Tx, pDA, MAC_ADDR_LEN);
	/* SA */
	RTMPTkipAppend(&pAd->PrivateInfo.Tx, pSA, MAC_ADDR_LEN);
	/* Priority + 3 bytes of 0 */
	RTMPTkipAppend(&pAd->PrivateInfo.Tx, (PUCHAR) & Priority, 4);
}

/*
	========================================================================

	Routine	Description:
		Compare MIC value of received MSDU

	Arguments:
		pAd	Pointer to our adapter
		pSrc        Pointer to the received Plain text data
		pDA			Pointer to DA address
		pSA			Pointer to SA address
		pMICKey		pointer to MIC Key
		Len         the length of the received plain text data exclude MIC value

	Return Value:
		TRUE        MIC value matched
		FALSE       MIC value mismatched

	IRQL = DISPATCH_LEVEL

	Note:

	========================================================================
*/
BOOLEAN RTMPTkipCompareMICValue(IN PRTMP_ADAPTER pAd,
				IN PUCHAR pSrc,
				IN PUCHAR pDA,
				IN PUCHAR pSA,
				IN PUCHAR pMICKey,
				IN UCHAR UserPriority, IN UINT Len)
{
	UCHAR OldMic[8];
	ULONG Priority = UserPriority;

	/* Init MIC value calculation */
	RTMPTkipSetMICKey(&pAd->PrivateInfo.Rx, pMICKey);
	/* DA */
	RTMPTkipAppend(&pAd->PrivateInfo.Rx, pDA, MAC_ADDR_LEN);
	/* SA */
	RTMPTkipAppend(&pAd->PrivateInfo.Rx, pSA, MAC_ADDR_LEN);
	/* Priority + 3 bytes of 0 */
	RTMPTkipAppend(&pAd->PrivateInfo.Rx, (PUCHAR) & Priority, 4);

	/* Calculate MIC value from plain text data */
	RTMPTkipAppend(&pAd->PrivateInfo.Rx, pSrc, Len);

	/* Get MIC valude from received frame */
	NdisMoveMemory(OldMic, pSrc + Len, 8);

	/* Get MIC value from decrypted plain data */
	RTMPTkipGetMIC(&pAd->PrivateInfo.Rx);

	/* Move MIC value from MSDU, this steps should move to data path. */
	/* Since the MIC value might cross MPDUs. */
	if (!NdisEqualMemory(pAd->PrivateInfo.Rx.MIC, OldMic, 8)) {
		DBGPRINT_RAW(RT_DEBUG_ERROR, ("RTMPTkipCompareMICValue(): TKIP MIC Error !\n"));	/*MIC error. */

		return (FALSE);
	}
	return (TRUE);
}

/*
	========================================================================

	Routine	Description:
		Copy frame from waiting queue into relative ring buffer and set
	appropriate ASIC register to kick hardware transmit function

	Arguments:
		pAd		Pointer	to our adapter
		PNDIS_PACKET	Pointer to Ndis Packet for MIC calculation
		pEncap			Pointer to LLC encap data
		LenEncap		Total encap length, might be 0 which indicates no encap

	Return Value:
		None

	IRQL = DISPATCH_LEVEL

	Note:

	========================================================================
*/
VOID RTMPCalculateMICValue(IN PRTMP_ADAPTER pAd,
			   IN PNDIS_PACKET pPacket,
			   IN PUCHAR pEncap,
			   IN PCIPHER_KEY pKey, IN UCHAR apidx)
{
	PACKET_INFO PacketInfo;
	PUCHAR pSrcBufVA;
	UINT SrcBufLen;
	PUCHAR pSrc;
	UCHAR UserPriority;
	UCHAR vlan_offset = 0;

	RTMP_QueryPacketInfo(pPacket, &PacketInfo, &pSrcBufVA, &SrcBufLen);

	UserPriority = RTMP_GET_PACKET_UP(pPacket);
	pSrc = pSrcBufVA;

	/* determine if this is a vlan packet */
	if (((*(pSrc + 12) << 8) + *(pSrc + 13)) == 0x8100)
		vlan_offset = 4;

	{
		RTMPInitMICEngine(pAd,
				  pKey->Key,
				  pSrc, pSrc + 6, UserPriority, pKey->TxMic);
	}

	if (pEncap != NULL) {
		/* LLC encapsulation */
		RTMPTkipAppend(&pAd->PrivateInfo.Tx, pEncap, 6);
		/* Protocol Type */
		RTMPTkipAppend(&pAd->PrivateInfo.Tx, pSrc + 12 + vlan_offset,
			       2);
	}
	SrcBufLen -= (14 + vlan_offset);
	pSrc += (14 + vlan_offset);
	do {
		if (SrcBufLen > 0) {
			RTMPTkipAppend(&pAd->PrivateInfo.Tx, pSrc, SrcBufLen);
		}

		break;		/* No need handle next packet */

	} while (TRUE);		/* End of copying payload */

	/* Compute the final MIC Value */
	RTMPTkipGetMIC(&pAd->PrivateInfo.Tx);
}

/************************************************************/
/* tkip_sbox()																*/
/* Returns a 16 bit value from a 64K entry table. The Table */
/* is synthesized from two 256 entry byte wide tables.		*/
/************************************************************/

UINT tkip_sbox(UINT index)
{
	UINT index_low;
	UINT index_high;
	UINT 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);
}

UINT rotr1(UINT a)
{
	unsigned int b;

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

VOID RTMPTkipMixKey(UCHAR * key, UCHAR * ta, ULONG pnl,	/* Least significant 16 bits of PN */
		    ULONG pnh,	/* Most significant 32 bits of PN */
		    UCHAR * rc4key, UINT * p1k)
{

	UINT tsc0;
	UINT tsc1;
	UINT tsc2;

	UINT ppk0;
	UINT ppk1;
	UINT ppk2;
	UINT ppk3;
	UINT ppk4;
	UINT ppk5;

	INT i;
	INT j;

	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] = (UINT) (ta[0] + (ta[1] * 256));
	p1k[3] = (UINT) (ta[2] + (ta[3] * 256));
	p1k[4] = (UINT) (ta[4] + (ta[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 * key[1 + j]) + key[j])) %
			       65536)) % 65536;
		p1k[1] =
		    (p1k[1] +
		     tkip_sbox((p1k[0] ^ ((256 * key[5 + j]) + key[4 + j])) %
			       65536)) % 65536;
		p1k[2] =
		    (p1k[2] +
		     tkip_sbox((p1k[1] ^ ((256 * key[9 + j]) + key[8 + j])) %
			       65536)) % 65536;
		p1k[3] =
		    (p1k[3] +
		     tkip_sbox((p1k[2] ^ ((256 * key[13 + j]) + key[12 + j])) %
			       65536)) % 65536;
		p1k[4] =
		    (p1k[4] +
		     tkip_sbox((p1k[3] ^ (((256 * key[1 + j]) + key[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 * key[1]) + key[0])) % 65536);
	ppk1 = ppk1 + tkip_sbox((ppk0 ^ ((256 * key[3]) + key[2])) % 65536);
	ppk2 = ppk2 + tkip_sbox((ppk1 ^ ((256 * key[5]) + key[4])) % 65536);
	ppk3 = ppk3 + tkip_sbox((ppk2 ^ ((256 * key[7]) + key[6])) % 65536);
	ppk4 = ppk4 + tkip_sbox((ppk3 ^ ((256 * key[9]) + key[8])) % 65536);
	ppk5 = ppk5 + tkip_sbox((ppk4 ^ ((256 * key[11]) + key[10])) % 65536);

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

	/* Phase 2, Step 3 */
	/* Phase 2, Step 3 */

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

	rc4key[0] = (tsc2 >> 8) % 256;
	rc4key[1] = (((tsc2 >> 8) % 256) | 0x20) & 0x7f;
	rc4key[2] = tsc2 % 256;
	rc4key[3] = ((ppk5 ^ ((256 * key[1]) + key[0])) >> 1) % 256;

	rc4key[4] = ppk0 % 256;
	rc4key[5] = (ppk0 >> 8) % 256;

	rc4key[6] = ppk1 % 256;
	rc4key[7] = (ppk1 >> 8) % 256;

	rc4key[8] = ppk2 % 256;
	rc4key[9] = (ppk2 >> 8) % 256;

	rc4key[10] = ppk3 % 256;
	rc4key[11] = (ppk3 >> 8) % 256;

	rc4key[12] = ppk4 % 256;
	rc4key[13] = (ppk4 >> 8) % 256;

	rc4key[14] = ppk5 % 256;
	rc4key[15] = (ppk5 >> 8) % 256;
}

/* */
/* TRUE: Success! */
/* FALSE: Decrypt Error! */
/* */
BOOLEAN RTMPSoftDecryptTKIP(IN PRTMP_ADAPTER pAd,
			    IN PUCHAR pData,
			    IN ULONG DataByteCnt,
			    IN UCHAR UserPriority, IN PCIPHER_KEY pWpaKey)
{
	UCHAR KeyID;
	UINT HeaderLen;
	UCHAR fc0;
	UCHAR fc1;
	USHORT fc;
	UINT frame_type;
	UINT frame_subtype;
	UINT from_ds;
	UINT to_ds;
	INT a4_exists;
	INT qc_exists;
	USHORT duration;
	USHORT seq_control;
	USHORT qos_control;
	UCHAR TA[MAC_ADDR_LEN];
	UCHAR DA[MAC_ADDR_LEN];
	UCHAR SA[MAC_ADDR_LEN];
	UCHAR RC4Key[16];
	UINT p1k[5];		/*for mix_key; */
	ULONG pnl;		/* Least significant 16 bits of PN */
	ULONG pnh;		/* Most significant 32 bits of PN */
	UINT num_blocks;
	UINT payload_remainder;
	ARCFOURCONTEXT ArcFourContext;
	UINT crc32 = 0;
	UINT trailfcs = 0;
	UCHAR MIC[8];
	UCHAR TrailMIC[8];

	fc0 = *pData;
	fc1 = *(pData + 1);

	fc = *((PUSHORT) pData);

	frame_type = ((fc0 >> 2) & 0x03);
	frame_subtype = ((fc0 >> 4) & 0x0f);

	from_ds = (fc1 & 0x2) >> 1;
	to_ds = (fc1 & 0x1);

	a4_exists = (from_ds & to_ds);
	qc_exists = ((frame_subtype == 0x08) ||	/* Assumed QoS subtypes */
		     (frame_subtype == 0x09) ||	/* Likely to change.    */
		     (frame_subtype == 0x0a) || (frame_subtype == 0x0b)
	    );

	HeaderLen = 24;
	if (a4_exists)
		HeaderLen += 6;

	KeyID = *((PUCHAR) (pData + HeaderLen + 3));
	KeyID = KeyID >> 6;

	if (pWpaKey[KeyID].KeyLen == 0) {
		DBGPRINT(RT_DEBUG_TRACE,
			 ("RTMPSoftDecryptTKIP failed!(KeyID[%d] Length can not be 0)\n",
			  KeyID));
		return FALSE;
	}

	duration = *((PUSHORT) (pData + 2));

	seq_control = *((PUSHORT) (pData + 22));

	if (qc_exists) {
		if (a4_exists) {
			qos_control = *((PUSHORT) (pData + 30));
		} else {
			qos_control = *((PUSHORT) (pData + 24));
		}
	}

	if (to_ds == 0 && from_ds == 1) {
		NdisMoveMemory(DA, pData + 4, MAC_ADDR_LEN);
		NdisMoveMemory(SA, pData + 16, MAC_ADDR_LEN);
		NdisMoveMemory(TA, pData + 10, MAC_ADDR_LEN);	/*BSSID */
	} else if (to_ds == 0 && from_ds == 0) {
		NdisMoveMemory(TA, pData + 10, MAC_ADDR_LEN);
		NdisMoveMemory(DA, pData + 4, MAC_ADDR_LEN);
		NdisMoveMemory(SA, pData + 10, MAC_ADDR_LEN);
	} else if (to_ds == 1 && from_ds == 0) {
		NdisMoveMemory(SA, pData + 10, MAC_ADDR_LEN);
		NdisMoveMemory(TA, pData + 10, MAC_ADDR_LEN);
		NdisMoveMemory(DA, pData + 16, MAC_ADDR_LEN);
	} else if (to_ds == 1 && from_ds == 1) {
		NdisMoveMemory(TA, pData + 10, MAC_ADDR_LEN);
		NdisMoveMemory(DA, pData + 16, MAC_ADDR_LEN);
		NdisMoveMemory(SA, pData + 22, MAC_ADDR_LEN);
	}

	num_blocks = (DataByteCnt - 16) / 16;
	payload_remainder = (DataByteCnt - 16) % 16;

	pnl = (*(pData + HeaderLen)) * 256 + *(pData + HeaderLen + 2);
	pnh = *((PULONG) (pData + HeaderLen + 4));
	pnh = cpu2le32(pnh);
	RTMPTkipMixKey(pWpaKey[KeyID].Key, TA, pnl, pnh, RC4Key, p1k);

	ARCFOUR_INIT(&ArcFourContext, RC4Key, 16);

	ARCFOUR_DECRYPT(&ArcFourContext, pData + HeaderLen,
			pData + HeaderLen + 8, DataByteCnt - HeaderLen - 8);
	NdisMoveMemory(&trailfcs, pData + DataByteCnt - 8 - 4, 4);
	crc32 = RTMP_CALC_FCS32(PPPINITFCS32, pData + HeaderLen, DataByteCnt - HeaderLen - 8 - 4);	/*Skip IV+EIV 8 bytes & Skip last 4 bytes(FCS). */
	crc32 ^= 0xffffffff;	/* complement */

	if (crc32 != cpu2le32(trailfcs)) {
		DBGPRINT(RT_DEBUG_TRACE, ("RTMPSoftDecryptTKIP, WEP Data ICV Error !\n"));	/*ICV error. */

		return (FALSE);
	}

	NdisMoveMemory(TrailMIC, pData + DataByteCnt - 8 - 8 - 4, 8);
	RTMPInitMICEngine(pAd, pWpaKey[KeyID].Key, DA, SA, UserPriority,
			  pWpaKey[KeyID].RxMic);
	RTMPTkipAppend(&pAd->PrivateInfo.Tx, pData + HeaderLen,
		       DataByteCnt - HeaderLen - 8 - 12);
	RTMPTkipGetMIC(&pAd->PrivateInfo.Tx);
	NdisMoveMemory(MIC, pAd->PrivateInfo.Tx.MIC, 8);

	if (!NdisEqualMemory(MIC, TrailMIC, 8)) {
		DBGPRINT(RT_DEBUG_ERROR, ("RTMPSoftDecryptTKIP, WEP Data MIC Error !\n"));	/*MIC error. */
		/*RTMPReportMicError(pAd, &pWpaKey[KeyID]);     // marked by AlbertY @ 20060630 */
		return (FALSE);
	}
	/*DBGPRINT(RT_DEBUG_TRACE, "RTMPSoftDecryptTKIP Decript done!!\n"); */
	return TRUE;
}