/******************************************************************************
 *
 * Copyright(c) 2007 - 2011 Realtek Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * 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.
 *
 ******************************************************************************/
#define  _RTW_SECURITY_C_

#include <osdep_service.h>
#include <drv_types.h>
#include <wifi.h>
#include <osdep_intf.h>

/* WEP related ===== */

#define CRC32_POLY 0x04c11db7

struct arc4context {
	u32 x;
	u32 y;
	u8 state[256];
};

static void arcfour_init(struct arc4context *parc4ctx, u8 *key, u32 key_len)
{
	u32 t, u;
	u32 keyindex;
	u32 stateindex;
	u8 *state;
	u32 counter;

	state = parc4ctx->state;
	parc4ctx->x = 0;
	parc4ctx->y = 0;
	for (counter = 0; counter < 256; counter++)
		state[counter] = (u8)counter;
	keyindex = 0;
	stateindex = 0;
	for (counter = 0; counter < 256; counter++) {
		t = state[counter];
		stateindex = (stateindex + key[keyindex] + t) & 0xff;
		u = state[stateindex];
		state[stateindex] = (u8)t;
		state[counter] = (u8)u;
		if (++keyindex >= key_len)
			keyindex = 0;
	}

}

static u32 arcfour_byte(struct arc4context *parc4ctx)
{
	u32 x;
	u32 y;
	u32 sx, sy;
	u8 *state;

	state = parc4ctx->state;
	x = (parc4ctx->x + 1) & 0xff;
	sx = state[x];
	y = (sx + parc4ctx->y) & 0xff;
	sy = state[y];
	parc4ctx->x = x;
	parc4ctx->y = y;
	state[y] = (u8)sx;
	state[x] = (u8)sy;

	return state[(sx + sy) & 0xff];
}

static void arcfour_encrypt(struct arc4context *parc4ctx, u8 *dest,
			    u8 *src, u32 len)
{
	u32 i;

	for (i = 0; i < len; i++)
		dest[i] = src[i] ^ (unsigned char)arcfour_byte(parc4ctx);
}

static int bcrc32initialized;
static u32 crc32_table[256];

static u8 crc32_reverseBit(u8 data)
{
	u8 retval = ((data << 7) & 0x80) | ((data << 5) & 0x40) |
		((data << 3) & 0x20) | ((data << 1) & 0x10) |
		((data >> 1) & 0x08) | ((data >> 3) & 0x04) |
		((data >> 5) & 0x02) | ((data >> 7) & 0x01);
	return retval;
}

static void crc32_init(void)
{
	int i, j;
	u32 c;
	u8 *p, *p1;
	u8 k;

	if (bcrc32initialized == 1)
		return;

	p = (u8 *) &c;
	c = 0x12340000;

	for (i = 0; i < 256; ++i) {
		k = crc32_reverseBit((u8)i);

		for (c = ((u32)k) << 24, j = 8; j > 0; --j)
			c = c & 0x80000000 ? (c << 1) ^ CRC32_POLY : (c << 1);

		p1 = (u8 *)&crc32_table[i];

		p1[0] = crc32_reverseBit(p[3]);
		p1[1] = crc32_reverseBit(p[2]);
		p1[2] = crc32_reverseBit(p[1]);
		p1[3] = crc32_reverseBit(p[0]);
	}

	bcrc32initialized = 1;
}

static u32 getcrc32(u8 *buf, int len)
{
	u8 *p;
	u32 crc;

	if (bcrc32initialized == 0)
		crc32_init();

	crc = 0xffffffff; /* preload shift register, per CRC-32 spec */

	for (p = buf; len > 0; ++p, --len)
		crc = crc32_table[(crc ^ *p) & 0xff] ^ (crc >> 8);

	return ~crc; /* transmit complement, per CRC-32 spec */
}

/* Need to consider the fragment  situation */
void rtw_wep_encrypt23a(struct rtw_adapter *padapter,
		     struct xmit_frame *pxmitframe)
{
	/*  exclude ICV */
	unsigned char crc[4];
	struct arc4context mycontext;
	int curfragnum, length, index;
	u32 keylength;
	u8 *pframe, *payload, *iv; /* wepkey */
	u8 wepkey[16];
	u8 hw_hdr_offset = 0;
	struct pkt_attrib *pattrib = &pxmitframe->attrib;
	struct security_priv *psecuritypriv = &padapter->securitypriv;
	struct xmit_priv *pxmitpriv = &padapter->xmitpriv;

	if (!pxmitframe->buf_addr)
		return;

	hw_hdr_offset = TXDESC_OFFSET;

	pframe = pxmitframe->buf_addr + hw_hdr_offset;

	/* start to encrypt each fragment */
	if (pattrib->encrypt != WLAN_CIPHER_SUITE_WEP40 &&
	    pattrib->encrypt != WLAN_CIPHER_SUITE_WEP104)
		return;

	index = psecuritypriv->dot11PrivacyKeyIndex;
	keylength = psecuritypriv->wep_key[index].keylen;

	for (curfragnum = 0; curfragnum < pattrib->nr_frags ; curfragnum++) {
		iv = pframe + pattrib->hdrlen;
		memcpy(&wepkey[0], iv, 3);
		memcpy(&wepkey[3], &psecuritypriv->wep_key[index].key,
		       keylength);
		payload = pframe + pattrib->iv_len + pattrib->hdrlen;

		if ((curfragnum + 1) == pattrib->nr_frags) {
			/* the last fragment */
			length = pattrib->last_txcmdsz - pattrib->hdrlen -
				pattrib->iv_len - pattrib->icv_len;

			*((u32 *)crc) = cpu_to_le32(getcrc32(payload, length));

			arcfour_init(&mycontext, wepkey, 3 + keylength);
			arcfour_encrypt(&mycontext, payload, payload, length);
			arcfour_encrypt(&mycontext, payload + length, crc, 4);
		} else {
			length = pxmitpriv->frag_len - pattrib->hdrlen -
				pattrib->iv_len - pattrib->icv_len;
			*((u32 *)crc) = cpu_to_le32(getcrc32(payload, length));
			arcfour_init(&mycontext, wepkey, 3 + keylength);
			arcfour_encrypt(&mycontext, payload, payload, length);
			arcfour_encrypt(&mycontext, payload + length, crc, 4);

			pframe += pxmitpriv->frag_len;
			pframe = PTR_ALIGN(pframe, 4);
		}
	}

}

void rtw_wep_decrypt23a(struct rtw_adapter *padapter,
		     struct recv_frame *precvframe)
{
	/*  exclude ICV */
	u32 actual_crc, expected_crc;
	struct arc4context mycontext;
	int length;
	u32 keylength;
	u8 *pframe, *payload, *iv, wepkey[16];
	u8 keyindex;
	struct rx_pkt_attrib *prxattrib = &precvframe->attrib;
	struct security_priv *psecuritypriv = &padapter->securitypriv;
	struct sk_buff *skb = precvframe->pkt;

	pframe = skb->data;

	/* start to decrypt recvframe */
	if (prxattrib->encrypt != WLAN_CIPHER_SUITE_WEP40 &&
	    prxattrib->encrypt != WLAN_CIPHER_SUITE_WEP104)
		return;

	iv = pframe + prxattrib->hdrlen;
	/* keyindex = (iv[3]&0x3); */
	keyindex = prxattrib->key_index;
	keylength = psecuritypriv->wep_key[keyindex].keylen;
	memcpy(&wepkey[0], iv, 3);
	/* memcpy(&wepkey[3], &psecuritypriv->dot11DefKey[psecuritypriv->dot11PrivacyKeyIndex].skey[0], keylength); */
	memcpy(&wepkey[3], &psecuritypriv->wep_key[keyindex].key, keylength);
	length = skb->len - prxattrib->hdrlen - prxattrib->iv_len;

	payload = pframe + prxattrib->iv_len + prxattrib->hdrlen;

	/* decrypt payload include icv */
	arcfour_init(&mycontext, wepkey, 3 + keylength);
	arcfour_encrypt(&mycontext, payload, payload, length);

	/* calculate icv and compare the icv */
	actual_crc = le32_to_cpu(getcrc32(payload, length - 4));
	expected_crc = le32_to_cpu(get_unaligned_le32(&payload[length - 4]));

	if (actual_crc != expected_crc) {
		RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
			 "%s:icv CRC mismatch: "
			 "actual: %08x, expected: %08x\n",
			 __func__, actual_crc, expected_crc);
	}
}

/* 3		===== TKIP related ===== */

static u32 secmicgetuint32(u8 *p)
/*  Convert from Byte[] to u32 in a portable way */
{
	s32 i;
	u32 res = 0;

	for (i = 0; i < 4; i++)
		res |= ((u32)(*p++)) << (8 * i);

	return res;
}

static void secmicputuint32(u8 *p, u32 val)
/*  Convert from long to Byte[] in a portable way */
{
	long i;

	for (i = 0; i < 4; i++) {
		*p++ = (u8) (val & 0xff);
		val >>= 8;
	}

}

static void secmicclear(struct mic_data *pmicdata)
{
/*  Reset the state to the empty message. */

	pmicdata->L = pmicdata->K0;
	pmicdata->R = pmicdata->K1;
	pmicdata->nBytesInM = 0;
	pmicdata->M = 0;

}

void rtw_secmicsetkey23a(struct mic_data *pmicdata, u8 *key)
{
	/*  Set the key */

	pmicdata->K0 = secmicgetuint32(key);
	pmicdata->K1 = secmicgetuint32(key + 4);
	/*  and reset the message */
	secmicclear(pmicdata);

}

void rtw_secmicappend23abyte23a(struct mic_data *pmicdata, u8 b)
{

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

}

void rtw_secmicappend23a(struct mic_data *pmicdata, u8 *src, u32 nbytes)
{

	/*  This is simple */
	while (nbytes > 0) {
		rtw_secmicappend23abyte23a(pmicdata, *src++);
		nbytes--;
	}

}

void rtw_secgetmic23a(struct mic_data *pmicdata, u8 *dst)
{

	/*  Append the minimum padding */
	rtw_secmicappend23abyte23a(pmicdata, 0x5a);
	rtw_secmicappend23abyte23a(pmicdata, 0);
	rtw_secmicappend23abyte23a(pmicdata, 0);
	rtw_secmicappend23abyte23a(pmicdata, 0);
	rtw_secmicappend23abyte23a(pmicdata, 0);
	/*  and then zeroes until the length is a multiple of 4 */
	while (pmicdata->nBytesInM != 0)
		rtw_secmicappend23abyte23a(pmicdata, 0);
	/*  The appendByte function has already computed the result. */
	secmicputuint32(dst, pmicdata->L);
	secmicputuint32(dst + 4, pmicdata->R);
	/*  Reset to the empty message. */
	secmicclear(pmicdata);

}

void rtw_seccalctkipmic23a(u8 *key, u8 *header, u8 *data, u32 data_len,
			   u8 *mic_code, u8 pri)
{

	struct mic_data micdata;
	u8 priority[4] = {0x0, 0x0, 0x0, 0x0};

	rtw_secmicsetkey23a(&micdata, key);
	priority[0] = pri;

	/* Michael MIC pseudo header: DA, SA, 3 x 0, Priority */
	if (header[1]&1) { /* ToDS == 1 */
			rtw_secmicappend23a(&micdata, &header[16], 6); /* DA */
		if (header[1]&2) /* From Ds == 1 */
			rtw_secmicappend23a(&micdata, &header[24], 6);
		else
			rtw_secmicappend23a(&micdata, &header[10], 6);
	} else { /* ToDS == 0 */
		rtw_secmicappend23a(&micdata, &header[4], 6); /* DA */
		if (header[1]&2) /* From Ds == 1 */
			rtw_secmicappend23a(&micdata, &header[16], 6);
		else
			rtw_secmicappend23a(&micdata, &header[10], 6);

	}
	rtw_secmicappend23a(&micdata, &priority[0], 4);

	rtw_secmicappend23a(&micdata, data, data_len);

	rtw_secgetmic23a(&micdata, mic_code);

}

/* macros for extraction/creation of unsigned char/unsigned short values  */
#define RotR1(v16)   ((((v16) >> 1) & 0x7FFF) ^ (((v16) & 1) << 15))
#define   Lo8(v16)   ((u8)((v16)       & 0x00FF))
#define   Hi8(v16)   ((u8)(((v16) >> 8) & 0x00FF))
#define  Lo16(v32)   ((u16)((v32)       & 0xFFFF))
#define  Hi16(v32)   ((u16)(((v32) >> 16) & 0xFFFF))
#define  Mk16(hi, lo) ((lo) ^ (((u16)(hi)) << 8))

/* select the Nth 16-bit word of the temporal key unsigned char array TK[] */
#define  TK16(N)     Mk16(tk[2 * (N) + 1], tk[2 * (N)])

/* S-box lookup: 16 bits --> 16 bits */
#define _S_(v16)     (Sbox1[0][Lo8(v16)] ^ Sbox1[1][Hi8(v16)])

/* fixed algorithm "parameters" */
#define PHASE1_LOOP_CNT   8    /* this needs to be "big enough"     */
#define TA_SIZE           6    /*  48-bit transmitter address       */
#define TK_SIZE          16    /* 128-bit temporal key              */
#define P1K_SIZE         10    /*  80-bit Phase1 key                */
#define RC4_KEY_SIZE     16    /* 128-bit RC4KEY (104 bits unknown) */

/* 2-unsigned char by 2-unsigned char subset of the full AES S-box table */
static const unsigned short Sbox1[2][256] = {
	/* Sbox for hash (can be in ROM) */
	{
		0xC6A5, 0xF884, 0xEE99, 0xF68D, 0xFF0D, 0xD6BD, 0xDEB1, 0x9154,
		0x6050, 0x0203, 0xCEA9, 0x567D, 0xE719, 0xB562, 0x4DE6, 0xEC9A,
		0x8F45, 0x1F9D, 0x8940, 0xFA87, 0xEF15, 0xB2EB, 0x8EC9, 0xFB0B,
		0x41EC, 0xB367, 0x5FFD, 0x45EA, 0x23BF, 0x53F7, 0xE496, 0x9B5B,
		0x75C2, 0xE11C, 0x3DAE, 0x4C6A, 0x6C5A, 0x7E41, 0xF502, 0x834F,
		0x685C, 0x51F4, 0xD134, 0xF908, 0xE293, 0xAB73, 0x6253, 0x2A3F,
		0x080C, 0x9552, 0x4665, 0x9D5E, 0x3028, 0x37A1, 0x0A0F, 0x2FB5,
		0x0E09, 0x2436, 0x1B9B, 0xDF3D, 0xCD26, 0x4E69, 0x7FCD, 0xEA9F,
		0x121B, 0x1D9E, 0x5874, 0x342E, 0x362D, 0xDCB2, 0xB4EE, 0x5BFB,
		0xA4F6, 0x764D, 0xB761, 0x7DCE, 0x527B, 0xDD3E, 0x5E71, 0x1397,
		0xA6F5, 0xB968, 0x0000, 0xC12C, 0x4060, 0xE31F, 0x79C8, 0xB6ED,
		0xD4BE, 0x8D46, 0x67D9, 0x724B, 0x94DE, 0x98D4, 0xB0E8, 0x854A,
		0xBB6B, 0xC52A, 0x4FE5, 0xED16, 0x86C5, 0x9AD7, 0x6655, 0x1194,
		0x8ACF, 0xE910, 0x0406, 0xFE81, 0xA0F0, 0x7844, 0x25BA, 0x4BE3,
		0xA2F3, 0x5DFE, 0x80C0, 0x058A, 0x3FAD, 0x21BC, 0x7048, 0xF104,
		0x63DF, 0x77C1, 0xAF75, 0x4263, 0x2030, 0xE51A, 0xFD0E, 0xBF6D,
		0x814C, 0x1814, 0x2635, 0xC32F, 0xBEE1, 0x35A2, 0x88CC, 0x2E39,
		0x9357, 0x55F2, 0xFC82, 0x7A47, 0xC8AC, 0xBAE7, 0x322B, 0xE695,
		0xC0A0, 0x1998, 0x9ED1, 0xA37F, 0x4466, 0x547E, 0x3BAB, 0x0B83,
		0x8CCA, 0xC729, 0x6BD3, 0x283C, 0xA779, 0xBCE2, 0x161D, 0xAD76,
		0xDB3B, 0x6456, 0x744E, 0x141E, 0x92DB, 0x0C0A, 0x486C, 0xB8E4,
		0x9F5D, 0xBD6E, 0x43EF, 0xC4A6, 0x39A8, 0x31A4, 0xD337, 0xF28B,
		0xD532, 0x8B43, 0x6E59, 0xDAB7, 0x018C, 0xB164, 0x9CD2, 0x49E0,
		0xD8B4, 0xACFA, 0xF307, 0xCF25, 0xCAAF, 0xF48E, 0x47E9, 0x1018,
		0x6FD5, 0xF088, 0x4A6F, 0x5C72, 0x3824, 0x57F1, 0x73C7, 0x9751,
		0xCB23, 0xA17C, 0xE89C, 0x3E21, 0x96DD, 0x61DC, 0x0D86, 0x0F85,
		0xE090, 0x7C42, 0x71C4, 0xCCAA, 0x90D8, 0x0605, 0xF701, 0x1C12,
		0xC2A3, 0x6A5F, 0xAEF9, 0x69D0, 0x1791, 0x9958, 0x3A27, 0x27B9,
		0xD938, 0xEB13, 0x2BB3, 0x2233, 0xD2BB, 0xA970, 0x0789, 0x33A7,
		0x2DB6, 0x3C22, 0x1592, 0xC920, 0x8749, 0xAAFF, 0x5078, 0xA57A,
		0x038F, 0x59F8, 0x0980, 0x1A17, 0x65DA, 0xD731, 0x84C6, 0xD0B8,
		0x82C3, 0x29B0, 0x5A77, 0x1E11, 0x7BCB, 0xA8FC, 0x6DD6, 0x2C3A,
	},
	{ /* second half of table is unsigned char-reversed version of first! */
		0xA5C6, 0x84F8, 0x99EE, 0x8DF6, 0x0DFF, 0xBDD6, 0xB1DE, 0x5491,
		0x5060, 0x0302, 0xA9CE, 0x7D56, 0x19E7, 0x62B5, 0xE64D, 0x9AEC,
		0x458F, 0x9D1F, 0x4089, 0x87FA, 0x15EF, 0xEBB2, 0xC98E, 0x0BFB,
		0xEC41, 0x67B3, 0xFD5F, 0xEA45, 0xBF23, 0xF753, 0x96E4, 0x5B9B,
		0xC275, 0x1CE1, 0xAE3D, 0x6A4C, 0x5A6C, 0x417E, 0x02F5, 0x4F83,
		0x5C68, 0xF451, 0x34D1, 0x08F9, 0x93E2, 0x73AB, 0x5362, 0x3F2A,
		0x0C08, 0x5295, 0x6546, 0x5E9D, 0x2830, 0xA137, 0x0F0A, 0xB52F,
		0x090E, 0x3624, 0x9B1B, 0x3DDF, 0x26CD, 0x694E, 0xCD7F, 0x9FEA,
		0x1B12, 0x9E1D, 0x7458, 0x2E34, 0x2D36, 0xB2DC, 0xEEB4, 0xFB5B,
		0xF6A4, 0x4D76, 0x61B7, 0xCE7D, 0x7B52, 0x3EDD, 0x715E, 0x9713,
		0xF5A6, 0x68B9, 0x0000, 0x2CC1, 0x6040, 0x1FE3, 0xC879, 0xEDB6,
		0xBED4, 0x468D, 0xD967, 0x4B72, 0xDE94, 0xD498, 0xE8B0, 0x4A85,
		0x6BBB, 0x2AC5, 0xE54F, 0x16ED, 0xC586, 0xD79A, 0x5566, 0x9411,
		0xCF8A, 0x10E9, 0x0604, 0x81FE, 0xF0A0, 0x4478, 0xBA25, 0xE34B,
		0xF3A2, 0xFE5D, 0xC080, 0x8A05, 0xAD3F, 0xBC21, 0x4870, 0x04F1,
		0xDF63, 0xC177, 0x75AF, 0x6342, 0x3020, 0x1AE5, 0x0EFD, 0x6DBF,
		0x4C81, 0x1418, 0x3526, 0x2FC3, 0xE1BE, 0xA235, 0xCC88, 0x392E,
		0x5793, 0xF255, 0x82FC, 0x477A, 0xACC8, 0xE7BA, 0x2B32, 0x95E6,
		0xA0C0, 0x9819, 0xD19E, 0x7FA3, 0x6644, 0x7E54, 0xAB3B, 0x830B,
		0xCA8C, 0x29C7, 0xD36B, 0x3C28, 0x79A7, 0xE2BC, 0x1D16, 0x76AD,
		0x3BDB, 0x5664, 0x4E74, 0x1E14, 0xDB92, 0x0A0C, 0x6C48, 0xE4B8,
		0x5D9F, 0x6EBD, 0xEF43, 0xA6C4, 0xA839, 0xA431, 0x37D3, 0x8BF2,
		0x32D5, 0x438B, 0x596E, 0xB7DA, 0x8C01, 0x64B1, 0xD29C, 0xE049,
		0xB4D8, 0xFAAC, 0x07F3, 0x25CF, 0xAFCA, 0x8EF4, 0xE947, 0x1810,
		0xD56F, 0x88F0, 0x6F4A, 0x725C, 0x2438, 0xF157, 0xC773, 0x5197,
		0x23CB, 0x7CA1, 0x9CE8, 0x213E, 0xDD96, 0xDC61, 0x860D, 0x850F,
		0x90E0, 0x427C, 0xC471, 0xAACC, 0xD890, 0x0506, 0x01F7, 0x121C,
		0xA3C2, 0x5F6A, 0xF9AE, 0xD069, 0x9117, 0x5899, 0x273A, 0xB927,
		0x38D9, 0x13EB, 0xB32B, 0x3322, 0xBBD2, 0x70A9, 0x8907, 0xA733,
		0xB62D, 0x223C, 0x9215, 0x20C9, 0x4987, 0xFFAA, 0x7850, 0x7AA5,
		0x8F03, 0xF859, 0x8009, 0x171A, 0xDA65, 0x31D7, 0xC684, 0xB8D0,
		0xC382, 0xB029, 0x775A, 0x111E, 0xCB7B, 0xFCA8, 0xD66D, 0x3A2C,
	}
};

 /*
**********************************************************************
* Routine: Phase 1 -- generate P1K, given TA, TK, IV32
*
* Inputs:
*     tk[]      = temporal key                         [128 bits]
*     ta[]      = transmitter's MAC address            [ 48 bits]
*     iv32      = upper 32 bits of IV                  [ 32 bits]
* Output:
*     p1k[]     = Phase 1 key                          [ 80 bits]
*
* Note:
*     This function only needs to be called every 2**16 packets,
*     although in theory it could be called every packet.
*
**********************************************************************
*/
static void phase1(u16 *p1k, const u8 *tk, const u8 *ta, u32 iv32)
{
	int  i;

	/* Initialize the 80 bits of P1K[] from IV32 and TA[0..5] */
	p1k[0]      = Lo16(iv32);
	p1k[1]      = Hi16(iv32);
	p1k[2]      = Mk16(ta[1], ta[0]); /* use TA[] as little-endian */
	p1k[3]      = Mk16(ta[3], ta[2]);
	p1k[4]      = Mk16(ta[5], ta[4]);

	/* Now compute an unbalanced Feistel cipher with 80-bit block */
	/* size on the 80-bit block P1K[], using the 128-bit key TK[] */
	for (i = 0; i < PHASE1_LOOP_CNT; i++) {
		/* Each add operation here is mod 2**16 */
		p1k[0] += _S_(p1k[4] ^ TK16((i & 1) + 0));
		p1k[1] += _S_(p1k[0] ^ TK16((i & 1) + 2));
		p1k[2] += _S_(p1k[1] ^ TK16((i & 1) + 4));
		p1k[3] += _S_(p1k[2] ^ TK16((i & 1) + 6));
		p1k[4] += _S_(p1k[3] ^ TK16((i & 1) + 0));
		p1k[4] +=  (unsigned short) i; /* avoid "slide attacks" */
		}

}

/*
**********************************************************************
* Routine: Phase 2 -- generate RC4KEY, given TK, P1K, IV16
*
* Inputs:
*     tk[]      = Temporal key                         [128 bits]
*     p1k[]     = Phase 1 output key                   [ 80 bits]
*     iv16      = low 16 bits of IV counter            [ 16 bits]
* Output:
*     rc4key[]  = the key used to encrypt the packet   [128 bits]
*
* Note:
*     The value {TA, IV32, IV16} for Phase1/Phase2 must be unique
*     across all packets using the same key TK value. Then, for a
*     given value of TK[], this TKIP48 construction guarantees that
*     the final RC4KEY value is unique across all packets.
*
* Suggested implementation optimization: if PPK[] is "overlaid"
*     appropriately on RC4KEY[], there is no need for the final
*     for loop below that copies the PPK[] result into RC4KEY[].
*
**********************************************************************
*/
static void phase2(u8 *rc4key, const u8 *tk, const u16 *p1k, u16 iv16)
{
	int  i;
	u16 PPK[6]; /* temporary key for mixing    */

	/* Note: all adds in the PPK[] equations below are mod 2**16 */
	for (i = 0; i < 5; i++)
		PPK[i] = p1k[i]; /* first, copy P1K to PPK */

	PPK[5] = p1k[4] + iv16; /* next,  add in IV16 */

	/* Bijective non-linear mixing of the 96 bits of PPK[0..5] */
	PPK[0] += _S_(PPK[5] ^ TK16(0)); /* Mix key in each "round" */
	PPK[1] += _S_(PPK[0] ^ TK16(1));
	PPK[2] += _S_(PPK[1] ^ TK16(2));
	PPK[3] += _S_(PPK[2] ^ TK16(3));
	PPK[4] += _S_(PPK[3] ^ TK16(4));
	PPK[5] += _S_(PPK[4] ^ TK16(5)); /* Total # S-box lookups == 6 */

	/* Final sweep: bijective, "linear". Rotates kill LSB correlations */
	PPK[0] +=  RotR1(PPK[5] ^ TK16(6));
	PPK[1] +=  RotR1(PPK[0] ^ TK16(7)); /* Use all of TK[] in Phase2 */
	PPK[2] +=  RotR1(PPK[1]);
	PPK[3] +=  RotR1(PPK[2]);
	PPK[4] +=  RotR1(PPK[3]);
	PPK[5] +=  RotR1(PPK[4]);
	/* Note: At this point, for a given key TK[0..15], the 96-bit output */
	/*       value PPK[0..5] is guaranteed to be unique, as a function   */
	/*       of the 96-bit "input" value   {TA, IV32, IV16}. That is,    */
	/*       P1K is now a keyed permutation of {TA, IV32, IV16}.         */

	/* Set RC4KEY[0..3], which includes "cleartext" portion of RC4 key   */
	rc4key[0] = Hi8(iv16);                 /* RC4KEY[0..2] is the WEP IV */
	rc4key[1] = (Hi8(iv16) | 0x20) & 0x7F; /* Help avoid weak (FMS) keys */
	rc4key[2] = Lo8(iv16);
	rc4key[3] = Lo8((PPK[5] ^ TK16(0)) >> 1);

	/* Copy 96 bits of PPK[0..5] to RC4KEY[4..15]  (little-endian) */
	for (i = 0; i < 6; i++) {
		rc4key[4 + 2 * i] = Lo8(PPK[i]);
		rc4key[5 + 2 * i] = Hi8(PPK[i]);
	}

}

/* The hlen isn't include the IV */
int rtw_tkip_encrypt23a(struct rtw_adapter *padapter,
			struct xmit_frame *pxmitframe)
{
	u16 pnl;
	u32 pnh;
	u8 rc4key[16];
	u8 ttkey[16];
	u8 crc[4];
	u8 hw_hdr_offset = 0;
	struct arc4context mycontext;
	int curfragnum, length;
	u32 prwskeylen;
	u8 *pframe, *payload, *iv, *prwskey;
	union pn48 dot11txpn;
	struct sta_info *stainfo;
	struct pkt_attrib *pattrib = &pxmitframe->attrib;
	struct security_priv *psecuritypriv = &padapter->securitypriv;
	struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
	int res = _SUCCESS;

	if (pattrib->encrypt != WLAN_CIPHER_SUITE_TKIP)
		return _FAIL;

	if (!pxmitframe->buf_addr)
		return _FAIL;

	hw_hdr_offset = TXDESC_OFFSET;

	pframe = pxmitframe->buf_addr + hw_hdr_offset;

	if (pattrib->psta)
		stainfo = pattrib->psta;
	else {
		DBG_8723A("%s, call rtw_get_stainfo()\n", __func__);
		stainfo = rtw_get_stainfo23a(&padapter->stapriv,
					     &pattrib->ra[0]);
	}

	if (stainfo == NULL) {
		RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
			 "%s: stainfo == NULL!!!\n", __func__);
		DBG_8723A("%s, psta == NUL\n", __func__);
		return _FAIL;
	}

	RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
		 "%s: stainfo!= NULL!!!\n", __func__);

	if (!(stainfo->state & _FW_LINKED)) {
		DBG_8723A("%s, psta->state(0x%x) != _FW_LINKED\n", __func__, stainfo->state);
		return _FAIL;
	}

	if (is_multicast_ether_addr(pattrib->ra))
		prwskey = psecuritypriv->dot118021XGrpKey[psecuritypriv->dot118021XGrpKeyid].skey;
	else
		prwskey = &stainfo->dot118021x_UncstKey.skey[0];

	prwskeylen = 16;

	/* 4 start to encrypt each fragment */
	for (curfragnum = 0; curfragnum < pattrib->nr_frags; curfragnum++) {
		iv = pframe + pattrib->hdrlen;
		payload = pframe + pattrib->iv_len + pattrib->hdrlen;

		GET_TKIP_PN(iv, dot11txpn);

		pnl = (u16)(dot11txpn.val);
		pnh = (u32)(dot11txpn.val>>16);

		phase1((u16 *)&ttkey[0], prwskey, &pattrib->ta[0], pnh);

		phase2(&rc4key[0], prwskey, (u16 *)&ttkey[0], pnl);

		if ((curfragnum + 1) == pattrib->nr_frags) { /* 4 the last fragment */
			length = (pattrib->last_txcmdsz -
				  pattrib->hdrlen -
				  pattrib->iv_len -
				  pattrib->icv_len);

			RT_TRACE(_module_rtl871x_security_c_, _drv_info_,
				 "pattrib->iv_len =%x, pattrib->icv_len =%x\n",
				 pattrib->iv_len,
				 pattrib->icv_len);
			*((u32 *)crc) = cpu_to_le32(getcrc32(payload, length));

			arcfour_init(&mycontext, rc4key, 16);
			arcfour_encrypt(&mycontext, payload, payload, length);
			arcfour_encrypt(&mycontext, payload + length, crc, 4);

		} else {
			length = (pxmitpriv->frag_len -
				  pattrib->hdrlen -
				  pattrib->iv_len -
				  pattrib->icv_len);

			*((u32 *)crc) = cpu_to_le32(getcrc32(payload, length));
			arcfour_init(&mycontext, rc4key, 16);
			arcfour_encrypt(&mycontext, payload, payload, length);
			arcfour_encrypt(&mycontext, payload + length, crc, 4);

			pframe += pxmitpriv->frag_len;
			pframe  = PTR_ALIGN(pframe, 4);
		}
	}

	return res;
}

/* The hlen isn't include the IV */
int rtw_tkip_decrypt23a(struct rtw_adapter *padapter,
			struct recv_frame *precvframe)
{
	u16 pnl;
	u32 pnh;
	u8 rc4key[16];
	u8 ttkey[16];
	u32 actual_crc, expected_crc;
	struct arc4context mycontext;
	int length;
	u32 prwskeylen;
	u8 *pframe, *payload, *iv, *prwskey;
	union pn48 dot11txpn;
	struct sta_info *stainfo;
	struct rx_pkt_attrib *prxattrib = &precvframe->attrib;
	struct security_priv *psecuritypriv = &padapter->securitypriv;
	struct sk_buff *skb = precvframe->pkt;
	int res = _SUCCESS;

	if (prxattrib->encrypt != WLAN_CIPHER_SUITE_TKIP)
		return _FAIL;

	pframe = skb->data;

	stainfo = rtw_get_stainfo23a(&padapter->stapriv,
				     &prxattrib->ta[0]);
	if (stainfo == NULL) {
		RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
			 "%s: stainfo == NULL!!!\n", __func__);
		return _FAIL;
	}

	/* 4 start to decrypt recvframe */
	if (is_multicast_ether_addr(prxattrib->ra)) {
		if (psecuritypriv->binstallGrpkey == 0) {
			res = _FAIL;
			DBG_8723A("%s:rx bc/mc packets, but didn't install group key!!!!!!!!!!\n", __func__);
			goto exit;
		}
		prwskey = psecuritypriv->dot118021XGrpKey[prxattrib->key_index].skey;
		prwskeylen = 16;
	} else {
		RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
			 "%s: stainfo!= NULL!!!\n", __func__);
		prwskey = &stainfo->dot118021x_UncstKey.skey[0];
		prwskeylen = 16;
	}

	iv = pframe + prxattrib->hdrlen;
	payload = pframe + prxattrib->iv_len + prxattrib->hdrlen;
	length = skb->len - prxattrib->hdrlen - prxattrib->iv_len;

	GET_TKIP_PN(iv, dot11txpn);

	pnl = (u16)(dot11txpn.val);
	pnh = (u32)(dot11txpn.val>>16);

	phase1((u16 *)&ttkey[0], prwskey, &prxattrib->ta[0], pnh);
	phase2(&rc4key[0], prwskey, (unsigned short *)&ttkey[0], pnl);

	/* 4 decrypt payload include icv */
	arcfour_init(&mycontext, rc4key, 16);
	arcfour_encrypt(&mycontext, payload, payload, length);

	actual_crc = le32_to_cpu(getcrc32(payload, length - 4));
	expected_crc = le32_to_cpu(get_unaligned_le32(&payload[length - 4]));

	if (actual_crc != expected_crc) {
		RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
			 "%s:icv CRC mismatch: "
			 "actual: %08x, expected: %08x\n",
			 __func__, actual_crc, expected_crc);
		res = _FAIL;
	}

exit:
	return res;
}

/* 3			===== AES related ===== */

#define MAX_MSG_SIZE	2048
/*****************************/
/******** SBOX Table *********/
/*****************************/

static  u8 sbox_table[256] = {
	0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5,
	0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
	0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0,
	0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
	0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc,
	0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
	0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a,
	0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
	0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0,
	0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
	0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b,
	0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
	0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85,
	0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
	0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5,
	0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
	0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17,
	0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
	0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88,
	0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
	0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c,
	0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
	0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9,
	0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
	0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6,
	0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
	0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e,
	0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
	0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94,
	0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
	0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68,
	0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
};

/*****************************/
/**** Function Prototypes ****/
/*****************************/

static void construct_mic_header2(u8 *mic_header2, u8 *mpdu, int a4_exists,
				  int qc_exists);

static void xor_128(u8 *a, u8 *b, u8 *out)
{
	int i;

	for (i = 0; i < 16; i++)
		out[i] = a[i] ^ b[i];
}

static void xor_32(u8 *a, u8 *b, u8 *out)
{
	int i;

	for (i = 0; i < 4; i++)
		out[i] = a[i] ^ b[i];
}

static u8 sbox(u8 a)
{
	return sbox_table[(int)a];
}

static void next_key(u8 *key, int round)
{
	u8 rcon;
	u8 sbox_key[4];
	u8 rcon_table[12] = {
		0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80,
		0x1b, 0x36, 0x36, 0x36
	};

	sbox_key[0] = sbox(key[13]);
	sbox_key[1] = sbox(key[14]);
	sbox_key[2] = sbox(key[15]);
	sbox_key[3] = sbox(key[12]);

	rcon = rcon_table[round];

	xor_32(&key[0], sbox_key, &key[0]);
	key[0] = key[0] ^ rcon;

	xor_32(&key[4], &key[0], &key[4]);
	xor_32(&key[8], &key[4], &key[8]);
	xor_32(&key[12], &key[8], &key[12]);

}

static void byte_sub(u8 *in, u8 *out)
{
	int i;

	for (i = 0; i < 16; i++)
		out[i] = sbox(in[i]);
}

static void shift_row(u8 *in, u8 *out)
{

	out[0] =  in[0];
	out[1] =  in[5];
	out[2] =  in[10];
	out[3] =  in[15];
	out[4] =  in[4];
	out[5] =  in[9];
	out[6] =  in[14];
	out[7] =  in[3];
	out[8] =  in[8];
	out[9] =  in[13];
	out[10] = in[2];
	out[11] = in[7];
	out[12] = in[12];
	out[13] = in[1];
	out[14] = in[6];
	out[15] = in[11];

}

static void mix_column(u8 *in, u8 *out)
{
	int i;
	u8 add1b[4];
	u8 add1bf7[4];
	u8 rotl[4];
	u8 swap_halfs[4];
	u8 andf7[4];
	u8 rotr[4];
	u8 temp[4];
	u8 tempb[4];

	for (i = 0; i < 4; i++) {
		if ((in[i] & 0x80) == 0x80)
			add1b[i] = 0x1b;
		else
			add1b[i] = 0x00;
	}

	swap_halfs[0] = in[2]; /* Swap halfs */
	swap_halfs[1] = in[3];
	swap_halfs[2] = in[0];
	swap_halfs[3] = in[1];

	rotl[0] = in[3]; /* Rotate left 8 bits */
	rotl[1] = in[0];
	rotl[2] = in[1];
	rotl[3] = in[2];

	andf7[0] = in[0] & 0x7f;
	andf7[1] = in[1] & 0x7f;
	andf7[2] = in[2] & 0x7f;
	andf7[3] = in[3] & 0x7f;

	for (i = 3; i > 0; i--) { /* logical shift left 1 bit */
		andf7[i] = andf7[i] << 1;
		if ((andf7[i - 1] & 0x80) == 0x80)
			andf7[i] = (andf7[i] | 0x01);
	}
	andf7[0] = andf7[0] << 1;
	andf7[0] = andf7[0] & 0xfe;

	xor_32(add1b, andf7, add1bf7);

	xor_32(in, add1bf7, rotr);

	temp[0] = rotr[0]; /* Rotate right 8 bits */
	rotr[0] = rotr[1];
	rotr[1] = rotr[2];
	rotr[2] = rotr[3];
	rotr[3] = temp[0];

	xor_32(add1bf7, rotr, temp);
	xor_32(swap_halfs, rotl, tempb);
	xor_32(temp, tempb, out);

}

static void aes128k128d(u8 *key, u8 *data, u8 *ciphertext)
{
	int round;
	int i;
	u8 intermediatea[16];
	u8 intermediateb[16];
	u8 round_key[16];

	for (i = 0; i < 16; i++)
		round_key[i] = key[i];

	for (round = 0; round < 11; round++) {
		if (round == 0) {
			xor_128(round_key, data, ciphertext);
			next_key(round_key, round);
		} else if (round == 10) {
			byte_sub(ciphertext, intermediatea);
			shift_row(intermediatea, intermediateb);
			xor_128(intermediateb, round_key, ciphertext);
		} else { /* 1 - 9 */
			byte_sub(ciphertext, intermediatea);
			shift_row(intermediatea, intermediateb);
			mix_column(&intermediateb[0], &intermediatea[0]);
			mix_column(&intermediateb[4], &intermediatea[4]);
			mix_column(&intermediateb[8], &intermediatea[8]);
			mix_column(&intermediateb[12], &intermediatea[12]);
			xor_128(intermediatea, round_key, ciphertext);
			next_key(round_key, round);
		}
	}

}

/************************************************/
/* construct_mic_iv()                           */
/* Builds the MIC IV from header fields and PN  */
/************************************************/
static void construct_mic_iv(u8 *mic_iv, int qc_exists, int a4_exists, u8 *mpdu,
			     uint payload_length, u8 *pn_vector)
{
	int i;

	mic_iv[0] = 0x59;
	if (qc_exists && a4_exists)
		mic_iv[1] = mpdu[30] & 0x0f; /* QoS_TC        */
	if (qc_exists && !a4_exists)
		mic_iv[1] = mpdu[24] & 0x0f; /* mute bits 7-4 */
	if (!qc_exists)
		mic_iv[1] = 0x00;
	for (i = 2; i < 8; i++)
		mic_iv[i] = mpdu[i + 8]; /* mic_iv[2:7] = A2[0:5] = mpdu[10:15] */
	for (i = 8; i < 14; i++)
		mic_iv[i] = pn_vector[13 - i]; /* mic_iv[8:13] = PN[5:0] */
	mic_iv[14] = (unsigned char)(payload_length / 256);
	mic_iv[15] = (unsigned char)(payload_length % 256);
}

/************************************************/
/* construct_mic_header1()                      */
/* Builds the first MIC header block from       */
/* header fields.                               */
/************************************************/
static void construct_mic_header1(u8 *mic_header1, int header_length, u8 *mpdu)
{
	mic_header1[0] = (u8)((header_length - 2) / 256);
	mic_header1[1] = (u8)((header_length - 2) % 256);
	mic_header1[2] = mpdu[0] & 0xcf; /* Mute CF poll & CF ack bits */
	mic_header1[3] = mpdu[1] & 0xc7; /* Mute retry, more data and pwr mgt bits */
	mic_header1[4] = mpdu[4]; /* A1 */
	mic_header1[5] = mpdu[5];
	mic_header1[6] = mpdu[6];
	mic_header1[7] = mpdu[7];
	mic_header1[8] = mpdu[8];
	mic_header1[9] = mpdu[9];
	mic_header1[10] = mpdu[10]; /* A2 */
	mic_header1[11] = mpdu[11];
	mic_header1[12] = mpdu[12];
	mic_header1[13] = mpdu[13];
	mic_header1[14] = mpdu[14];
	mic_header1[15] = mpdu[15];

}

/************************************************/
/* construct_mic_header2()                      */
/* Builds the last MIC header block from        */
/* header fields.                               */
/************************************************/
static void construct_mic_header2(u8 *mic_header2, u8 *mpdu, int a4_exists,
				  int qc_exists)
{
	int i;

	for (i = 0; i < 16; i++)
		mic_header2[i] = 0x00;

	mic_header2[0] = mpdu[16]; /* A3 */
	mic_header2[1] = mpdu[17];
	mic_header2[2] = mpdu[18];
	mic_header2[3] = mpdu[19];
	mic_header2[4] = mpdu[20];
	mic_header2[5] = mpdu[21];

	mic_header2[6] = 0x00;
	mic_header2[7] = 0x00; /* mpdu[23]; */

	if (!qc_exists && a4_exists) {
		for (i = 0; i < 6; i++)
			mic_header2[8+i] = mpdu[24+i]; /* A4 */
	}

	if (qc_exists && !a4_exists) {
		mic_header2[8] = mpdu[24] & 0x0f; /* mute bits 15 - 4 */
		mic_header2[9] = mpdu[25] & 0x00;
	}

	if (qc_exists && a4_exists) {
		for (i = 0; i < 6; i++)
			mic_header2[8+i] = mpdu[24+i]; /* A4 */

		mic_header2[14] = mpdu[30] & 0x0f;
		mic_header2[15] = mpdu[31] & 0x00;
	}

}

/************************************************/
/* construct_mic_header2()                      */
/* Builds the last MIC header block from        */
/* header fields.                               */
/************************************************/
static void construct_ctr_preload(u8 *ctr_preload, int a4_exists, int qc_exists,
				  u8 *mpdu, u8 *pn_vector, int c)
{
	int i = 0;

	for (i = 0; i < 16; i++)
		ctr_preload[i] = 0x00;

	i = 0;

	ctr_preload[0] = 0x01; /* flag */
	if (qc_exists && a4_exists)
		ctr_preload[1] = mpdu[30] & 0x0f; /* QoC_Control */
	if (qc_exists && !a4_exists)
		ctr_preload[1] = mpdu[24] & 0x0f;

	for (i = 2; i < 8; i++)
		ctr_preload[i] = mpdu[i + 8]; /* ctr_preload[2:7] = A2[0:5] = mpdu[10:15] */
	for (i = 8; i < 14; i++)
		ctr_preload[i] = pn_vector[13 - i]; /* ctr_preload[8:13] = PN[5:0] */
	ctr_preload[14] =  (unsigned char) (c / 256); /* Ctr */
	ctr_preload[15] =  (unsigned char) (c % 256);

}

/************************************/
/* bitwise_xor()                    */
/* A 128 bit, bitwise exclusive or  */
/************************************/
static void bitwise_xor(u8 *ina, u8 *inb, u8 *out)
{
	int i;

	for (i = 0; i < 16; i++)
		out[i] = ina[i] ^ inb[i];
}

static int aes_cipher(u8 *key, uint hdrlen, u8 *pframe, uint plen)
{
	uint qc_exists, a4_exists, i, j, payload_remainder,
	     num_blocks, payload_index;
	u8 pn_vector[6];
	u8 mic_iv[16];
	u8 mic_header1[16];
	u8 mic_header2[16];
	u8 ctr_preload[16];
	/* Intermediate Buffers */
	u8 chain_buffer[16];
	u8 aes_out[16];
	u8 padded_buffer[16];
	u8 mic[8];
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)pframe;
	u16 frsubtype = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_STYPE;

	memset((void *)mic_iv, 0, 16);
	memset((void *)mic_header1, 0, 16);
	memset((void *)mic_header2, 0, 16);
	memset((void *)ctr_preload, 0, 16);
	memset((void *)chain_buffer, 0, 16);
	memset((void *)aes_out, 0, 16);
	memset((void *)padded_buffer, 0, 16);

	if ((hdrlen == sizeof(struct ieee80211_hdr_3addr) ||
	    (hdrlen == sizeof(struct ieee80211_qos_hdr))))
		a4_exists = 0;
	else
		a4_exists = 1;

	if (ieee80211_is_data(hdr->frame_control)) {
		if ((frsubtype == IEEE80211_STYPE_DATA_CFACK) ||
		    (frsubtype == IEEE80211_STYPE_DATA_CFPOLL) ||
		    (frsubtype == IEEE80211_STYPE_DATA_CFACKPOLL)) {
			qc_exists = 1;
			if (hdrlen != sizeof(struct ieee80211_qos_hdr))
				hdrlen += 2;
		} else if ((frsubtype == IEEE80211_STYPE_QOS_DATA) ||
			   (frsubtype == IEEE80211_STYPE_QOS_DATA_CFACK) ||
			   (frsubtype == IEEE80211_STYPE_QOS_DATA_CFPOLL) ||
			   (frsubtype == IEEE80211_STYPE_QOS_DATA_CFACKPOLL)) {
			if (hdrlen != sizeof(struct ieee80211_qos_hdr))
				hdrlen += 2;
			qc_exists = 1;
		} else {
			qc_exists = 0;
		}
	} else {
		qc_exists = 0;
	}
	pn_vector[0] = pframe[hdrlen];
	pn_vector[1] = pframe[hdrlen + 1];
	pn_vector[2] = pframe[hdrlen + 4];
	pn_vector[3] = pframe[hdrlen + 5];
	pn_vector[4] = pframe[hdrlen + 6];
	pn_vector[5] = pframe[hdrlen + 7];

	construct_mic_iv(mic_iv, qc_exists, a4_exists, pframe, plen, pn_vector);

	construct_mic_header1(mic_header1, hdrlen, pframe);
	construct_mic_header2(mic_header2, pframe, a4_exists, qc_exists);

	payload_remainder = plen % 16;
	num_blocks = plen / 16;

	/* Find start of payload */
	payload_index = hdrlen + 8;

	/* Calculate MIC */
	aes128k128d(key, mic_iv, aes_out);
	bitwise_xor(aes_out, mic_header1, chain_buffer);
	aes128k128d(key, chain_buffer, aes_out);
	bitwise_xor(aes_out, mic_header2, chain_buffer);
	aes128k128d(key, chain_buffer, aes_out);

	for (i = 0; i < num_blocks; i++) {
		bitwise_xor(aes_out, &pframe[payload_index], chain_buffer);

		payload_index += 16;
		aes128k128d(key, chain_buffer, aes_out);
	}

	/* Add on the final payload block if it needs padding */
	if (payload_remainder > 0) {
		for (j = 0; j < 16; j++)
			padded_buffer[j] = 0x00;
		for (j = 0; j < payload_remainder; j++)
			padded_buffer[j] = pframe[payload_index++];
		bitwise_xor(aes_out, padded_buffer, chain_buffer);
		aes128k128d(key, chain_buffer, aes_out);
	}

	for (j = 0; j < 8; j++)
		mic[j] = aes_out[j];

	/* Insert MIC into payload */
	for (j = 0; j < 8; j++)
		pframe[payload_index + j] = mic[j];

	payload_index = hdrlen + 8;
	for (i = 0; i < num_blocks; i++) {
		construct_ctr_preload(ctr_preload, a4_exists, qc_exists,
				      pframe, pn_vector, i + 1);
		aes128k128d(key, ctr_preload, aes_out);
		bitwise_xor(aes_out, &pframe[payload_index], chain_buffer);
		for (j = 0; j < 16; j++)
			pframe[payload_index++] = chain_buffer[j];
	}

	if (payload_remainder > 0) {
		/* If there is a short final block, then pad it,
		 * encrypt it and copy the unpadded part back
		 */
		construct_ctr_preload(ctr_preload, a4_exists, qc_exists, pframe,
				      pn_vector, num_blocks + 1);

		for (j = 0; j < 16; j++)
			padded_buffer[j] = 0x00;
		for (j = 0; j < payload_remainder; j++)
			padded_buffer[j] = pframe[payload_index + j];
		aes128k128d(key, ctr_preload, aes_out);
		bitwise_xor(aes_out, padded_buffer, chain_buffer);
		for (j = 0; j < payload_remainder; j++)
			pframe[payload_index++] = chain_buffer[j];
	}

	/* Encrypt the MIC */
	construct_ctr_preload(ctr_preload, a4_exists, qc_exists, pframe,
			      pn_vector, 0);

	for (j = 0; j < 16; j++)
		padded_buffer[j] = 0x00;
	for (j = 0; j < 8; j++)
		padded_buffer[j] = pframe[j + hdrlen + 8 + plen];

	aes128k128d(key, ctr_preload, aes_out);
	bitwise_xor(aes_out, padded_buffer, chain_buffer);
	for (j = 0; j < 8; j++)
		pframe[payload_index++] = chain_buffer[j];

	return _SUCCESS;
}

int rtw_aes_encrypt23a(struct rtw_adapter *padapter,
		       struct xmit_frame *pxmitframe)
{	/* exclude ICV */
	/* Intermediate Buffers */
	int curfragnum, length;
	u32 prwskeylen;
	u8 *pframe, *prwskey;
	u8 hw_hdr_offset = 0;
	struct sta_info *stainfo;
	struct pkt_attrib *pattrib = &pxmitframe->attrib;
	struct security_priv *psecuritypriv = &padapter->securitypriv;
	struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
	int res = _SUCCESS;

	if (!pxmitframe->buf_addr)
		return _FAIL;

	hw_hdr_offset = TXDESC_OFFSET;

	pframe = pxmitframe->buf_addr + hw_hdr_offset;

	/* 4 start to encrypt each fragment */
	if (pattrib->encrypt != WLAN_CIPHER_SUITE_CCMP)
		return _FAIL;

	if (pattrib->psta) {
		stainfo = pattrib->psta;
	} else {
		DBG_8723A("%s, call rtw_get_stainfo23a()\n", __func__);
		stainfo = rtw_get_stainfo23a(&padapter->stapriv, &pattrib->ra[0]);
	}

	if (!stainfo) {
		RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
			 "%s: stainfo == NULL!!!\n", __func__);
		DBG_8723A("%s, psta == NUL\n", __func__);
		res = _FAIL;
		goto out;
	}
	if (!(stainfo->state & _FW_LINKED)) {
		DBG_8723A("%s, psta->state(0x%x) != _FW_LINKED\n",
			  __func__, stainfo->state);
		return _FAIL;
	}
	RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
		 "%s: stainfo!= NULL!!!\n", __func__);

	if (is_multicast_ether_addr(pattrib->ra))
		prwskey = psecuritypriv->dot118021XGrpKey[psecuritypriv->dot118021XGrpKeyid].skey;
	else
		prwskey = &stainfo->dot118021x_UncstKey.skey[0];

	prwskeylen = 16;

	for (curfragnum = 0; curfragnum < pattrib->nr_frags; curfragnum++) {
		/* 4 the last fragment */
		if ((curfragnum + 1) == pattrib->nr_frags) {
			length = pattrib->last_txcmdsz -
				pattrib->hdrlen-pattrib->iv_len -
				pattrib->icv_len;

			aes_cipher(prwskey, pattrib->hdrlen, pframe, length);
		} else {
			length = pxmitpriv->frag_len-pattrib->hdrlen -
				pattrib->iv_len - pattrib->icv_len;

			aes_cipher(prwskey, pattrib->hdrlen, pframe, length);
			pframe += pxmitpriv->frag_len;
			pframe = PTR_ALIGN(pframe, 4);
		}
	}
out:
	return res;
}

static int aes_decipher(u8 *key, uint hdrlen, u8 *pframe, uint plen)
{
	static u8 message[MAX_MSG_SIZE];
	uint qc_exists, a4_exists, i, j, payload_remainder,
	     num_blocks, payload_index;
	int res = _SUCCESS;
	u8 pn_vector[6];
	u8 mic_iv[16];
	u8 mic_header1[16];
	u8 mic_header2[16];
	u8 ctr_preload[16];
	/* Intermediate Buffers */
	u8 chain_buffer[16];
	u8 aes_out[16];
	u8 padded_buffer[16];
	u8 mic[8];
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)pframe;
	u16 frsubtype = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_STYPE;

	memset((void *)mic_iv, 0, 16);
	memset((void *)mic_header1, 0, 16);
	memset((void *)mic_header2, 0, 16);
	memset((void *)ctr_preload, 0, 16);
	memset((void *)chain_buffer, 0, 16);
	memset((void *)aes_out, 0, 16);
	memset((void *)padded_buffer, 0, 16);

	/* start to decrypt the payload */

	num_blocks = (plen - 8) / 16; /* plen including llc, payload_length and mic) */

	payload_remainder = (plen - 8) % 16;

	pn_vector[0]  = pframe[hdrlen];
	pn_vector[1]  = pframe[hdrlen + 1];
	pn_vector[2]  = pframe[hdrlen + 4];
	pn_vector[3]  = pframe[hdrlen + 5];
	pn_vector[4]  = pframe[hdrlen + 6];
	pn_vector[5]  = pframe[hdrlen + 7];

	if ((hdrlen == sizeof(struct ieee80211_hdr_3addr) ||
	    (hdrlen == sizeof(struct ieee80211_qos_hdr))))
		a4_exists = 0;
	else
		a4_exists = 1;

	if (ieee80211_is_data(hdr->frame_control)) {
		if ((frsubtype == IEEE80211_STYPE_DATA_CFACK) ||
		    (frsubtype == IEEE80211_STYPE_DATA_CFPOLL) ||
		    (frsubtype == IEEE80211_STYPE_DATA_CFACKPOLL)) {
			qc_exists = 1;
			if (hdrlen != sizeof(struct ieee80211_hdr_3addr))
				hdrlen += 2;
		} else if ((frsubtype == IEEE80211_STYPE_QOS_DATA) ||
			   (frsubtype == IEEE80211_STYPE_QOS_DATA_CFACK) ||
			   (frsubtype == IEEE80211_STYPE_QOS_DATA_CFPOLL) ||
			   (frsubtype == IEEE80211_STYPE_QOS_DATA_CFACKPOLL)) {
			if (hdrlen != sizeof(struct ieee80211_hdr_3addr))
				hdrlen += 2;
			qc_exists = 1;
		} else {
			qc_exists = 0;
		}
	} else {
		qc_exists = 0;
	}

	/* now, decrypt pframe with hdrlen offset and plen long */

	payload_index = hdrlen + 8; /*  8 is for extiv */

	for (i = 0; i < num_blocks; i++) {
		construct_ctr_preload(ctr_preload, a4_exists, qc_exists,
				      pframe, pn_vector, i + 1);

		aes128k128d(key, ctr_preload, aes_out);
		bitwise_xor(aes_out, &pframe[payload_index], chain_buffer);

		for (j = 0; j < 16; j++)
			pframe[payload_index++] = chain_buffer[j];
	}

	if (payload_remainder > 0) {
		/* If there is a short final block, then pad it,
		 * encrypt it and copy the unpadded part back
		 */
		construct_ctr_preload(ctr_preload, a4_exists, qc_exists, pframe,
				      pn_vector, num_blocks + 1);

		for (j = 0; j < 16; j++)
			padded_buffer[j] = 0x00;
		for (j = 0; j < payload_remainder; j++)
			padded_buffer[j] = pframe[payload_index + j];
		aes128k128d(key, ctr_preload, aes_out);
		bitwise_xor(aes_out, padded_buffer, chain_buffer);
		for (j = 0; j < payload_remainder; j++)
			pframe[payload_index++] = chain_buffer[j];
	}

	/* start to calculate the mic */
	if ((hdrlen + plen + 8) <= MAX_MSG_SIZE)
		memcpy(message, pframe, (hdrlen + plen + 8)); /* 8 is for ext iv len */

	pn_vector[0] = pframe[hdrlen];
	pn_vector[1] = pframe[hdrlen + 1];
	pn_vector[2] = pframe[hdrlen + 4];
	pn_vector[3] = pframe[hdrlen + 5];
	pn_vector[4] = pframe[hdrlen + 6];
	pn_vector[5] = pframe[hdrlen + 7];

	construct_mic_iv(mic_iv, qc_exists, a4_exists, message,
			 plen - 8, pn_vector);

	construct_mic_header1(mic_header1, hdrlen, message);
	construct_mic_header2(mic_header2, message, a4_exists, qc_exists);

	payload_remainder = (plen - 8) % 16;
	num_blocks = (plen - 8) / 16;

	/* Find start of payload */
	payload_index = hdrlen + 8;

	/* Calculate MIC */
	aes128k128d(key, mic_iv, aes_out);
	bitwise_xor(aes_out, mic_header1, chain_buffer);
	aes128k128d(key, chain_buffer, aes_out);
	bitwise_xor(aes_out, mic_header2, chain_buffer);
	aes128k128d(key, chain_buffer, aes_out);

	for (i = 0; i < num_blocks; i++) {
		bitwise_xor(aes_out, &message[payload_index], chain_buffer);

		payload_index += 16;
		aes128k128d(key, chain_buffer, aes_out);
	}

	/* Add on the final payload block if it needs padding */
	if (payload_remainder > 0) {
		for (j = 0; j < 16; j++)
			padded_buffer[j] = 0x00;
		for (j = 0; j < payload_remainder; j++)
			padded_buffer[j] = message[payload_index++];
		bitwise_xor(aes_out, padded_buffer, chain_buffer);
		aes128k128d(key, chain_buffer, aes_out);
	}

	for (j = 0 ; j < 8; j++)
		mic[j] = aes_out[j];

	/* Insert MIC into payload */
	for (j = 0; j < 8; j++)
		message[payload_index + j] = mic[j];

	payload_index = hdrlen + 8;
	for (i = 0; i < num_blocks; i++) {
		construct_ctr_preload(ctr_preload, a4_exists, qc_exists,
				      message, pn_vector, i + 1);
		aes128k128d(key, ctr_preload, aes_out);
		bitwise_xor(aes_out, &message[payload_index], chain_buffer);
		for (j = 0; j < 16; j++)
			message[payload_index++] = chain_buffer[j];
	}

	if (payload_remainder > 0) {
		/* If there is a short final block, then pad it,
		 * encrypt it and copy the unpadded part back
		 */
		construct_ctr_preload(ctr_preload, a4_exists, qc_exists,
				      message, pn_vector, num_blocks + 1);

		for (j = 0; j < 16; j++)
			padded_buffer[j] = 0x00;
		for (j = 0; j < payload_remainder; j++)
			padded_buffer[j] = message[payload_index + j];
		aes128k128d(key, ctr_preload, aes_out);
		bitwise_xor(aes_out, padded_buffer, chain_buffer);
		for (j = 0; j < payload_remainder; j++)
			message[payload_index++] = chain_buffer[j];
	}

	/* Encrypt the MIC */
	construct_ctr_preload(ctr_preload, a4_exists, qc_exists, message,
			      pn_vector, 0);

	for (j = 0; j < 16; j++)
		padded_buffer[j] = 0x00;
	for (j = 0; j < 8; j++)
		padded_buffer[j] = message[j + hdrlen + 8 + plen - 8];

	aes128k128d(key, ctr_preload, aes_out);
	bitwise_xor(aes_out, padded_buffer, chain_buffer);
	for (j = 0; j < 8; j++)
		message[payload_index++] = chain_buffer[j];

	/* compare the mic */
	for (i = 0; i < 8; i++) {
		if (pframe[hdrlen + 8 + plen - 8 + i] != message[hdrlen + 8 + plen - 8 + i]) {
			RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
				 "%s:mic check error mic[%d]: pframe(%x) != message(%x)\n",
				 __func__, i,
				 pframe[hdrlen + 8 + plen - 8 + i],
				 message[hdrlen + 8 + plen - 8 + i]);
			DBG_8723A("%s:mic check error mic[%d]: pframe(%x) != message(%x)\n",
				  __func__, i,
				  pframe[hdrlen + 8 + plen - 8 + i],
				  message[hdrlen + 8 + plen - 8 + i]);
			res = _FAIL;
		}
	}
	return res;
}

int rtw_aes_decrypt23a(struct rtw_adapter *padapter,
		       struct recv_frame *precvframe)
{	/*  exclude ICV */
	struct sta_info *stainfo;
	struct rx_pkt_attrib *prxattrib = &precvframe->attrib;
	struct security_priv *psecuritypriv = &padapter->securitypriv;
	struct sk_buff *skb = precvframe->pkt;
	int length;
	u8 *pframe, *prwskey;
	int res = _SUCCESS;

	pframe = skb->data;
	/* 4 start to encrypt each fragment */
	if (prxattrib->encrypt != WLAN_CIPHER_SUITE_CCMP)
		return _FAIL;

	stainfo = rtw_get_stainfo23a(&padapter->stapriv, &prxattrib->ta[0]);
	if (!stainfo) {
		RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
			 "%s: stainfo == NULL!!!\n", __func__);
		res = _FAIL;
		goto exit;
	}

	RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
		 "%s: stainfo!= NULL!!!\n", __func__);

	if (is_multicast_ether_addr(prxattrib->ra)) {
		/* in concurrent we should use sw decrypt in
		 * group key, so we remove this message
		 */
		if (!psecuritypriv->binstallGrpkey) {
			res = _FAIL;
			DBG_8723A("%s:rx bc/mc packets, but didn't install "
				  "group key!!!!!!!!!!\n", __func__);
			goto exit;
		}
		prwskey = psecuritypriv->dot118021XGrpKey[prxattrib->key_index].skey;
		if (psecuritypriv->dot118021XGrpKeyid != prxattrib->key_index) {
			DBG_8723A("not match packet_index =%d, install_index ="
				  "%d\n", prxattrib->key_index,
				  psecuritypriv->dot118021XGrpKeyid);
			res = _FAIL;
			goto exit;
		}
	} else {
		prwskey = &stainfo->dot118021x_UncstKey.skey[0];
	}

	length = skb->len - prxattrib->hdrlen -	prxattrib->iv_len;

	res = aes_decipher(prwskey, prxattrib->hdrlen, pframe, length);
exit:
	return res;
}

void rtw_use_tkipkey_handler23a(void *FunctionContext)
{
	struct rtw_adapter *padapter = (struct rtw_adapter *)FunctionContext;

	RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
		 "^^^%s ^^^\n", __func__);
	padapter->securitypriv.busetkipkey = 1;
	RT_TRACE(_module_rtl871x_security_c_, _drv_err_,
		 "^^^%s padapter->securitypriv.busetkipkey =%d^^^\n",
		 __func__, padapter->securitypriv.busetkipkey);
}