/******************************************************************************
 * rtl871x_security.c
 *
 * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
 * Linux device driver for RTL8192SU
 *
 * 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.
 *
 * 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, USA
 *
 * Modifications for inclusion into the Linux staging tree are
 * Copyright(c) 2010 Larry Finger. All rights reserved.
 *
 * Contact information:
 * WLAN FAE <wlanfae@realtek.com>
 * Larry Finger <Larry.Finger@lwfinger.net>
 *
 ******************************************************************************/

#define  _RTL871X_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 sint bcrc32initialized;
static u32 crc32_table[256];

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

static void crc32_init(void)
{
        if (bcrc32initialized == 1)
                return;
        else {
                sint i, j;
                u32 c;
                u8 *p = (u8 *)&c, *p1;
                u8 k;

                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, u32 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 r8712_wep_encrypt(struct _adapter *padapter, u8 *pxmitframe)
{       /* exclude ICV */
        unsigned char   crc[4];
        struct arc4context  mycontext;
        u32 curfragnum, length, keylength;
        u8 *pframe, *payload, *iv;    /*,*wepkey*/
        u8 wepkey[16];
        struct  pkt_attrib  *pattrib = &((struct xmit_frame *)
                                       pxmitframe)->attrib;
        struct  security_priv *psecuritypriv = &padapter->securitypriv;
        struct  xmit_priv *pxmitpriv = &padapter->xmitpriv;

        if (((struct xmit_frame *)pxmitframe)->buf_addr == NULL)
                return;
        pframe = ((struct xmit_frame *)pxmitframe)->buf_addr+TXDESC_OFFSET;
        /*start to encrypt each fragment*/
        if ((pattrib->encrypt == _WEP40_) || (pattrib->encrypt == _WEP104_)) {
                keylength = psecuritypriv->DefKeylen[psecuritypriv->
                            PrivacyKeyIndex];
                for (curfragnum = 0; curfragnum < pattrib->nr_frags;
                     curfragnum++) {
                        iv = pframe+pattrib->hdrlen;
                        memcpy(&wepkey[0], iv, 3);
                        memcpy(&wepkey[3], &psecuritypriv->DefKey[
                                psecuritypriv->PrivacyKeyIndex].skey[0],
                                keylength);
                        payload = pframe+pattrib->iv_len+pattrib->hdrlen;
                        if ((curfragnum + 1) == pattrib->nr_frags) {
                                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 = (u8 *)RND4((addr_t)(pframe));
                        }
                }
        }
}

void r8712_wep_decrypt(struct _adapter  *padapter, u8 *precvframe)
{
        /* exclude ICV */
        u8 crc[4];
        struct arc4context  mycontext;
        u32 length, keylength;
        u8 *pframe, *payload, *iv, wepkey[16];
        u8  keyindex;
        struct rx_pkt_attrib  *prxattrib = &(((union recv_frame *)
                                          precvframe)->u.hdr.attrib);
        struct security_priv *psecuritypriv = &padapter->securitypriv;

        pframe = (unsigned char *)((union recv_frame *)precvframe)->
                  u.hdr.rx_data;
        /* start to decrypt recvframe */
        if ((prxattrib->encrypt == _WEP40_) || (prxattrib->encrypt ==
             _WEP104_)) {
                iv = pframe + prxattrib->hdrlen;
                keyindex = (iv[3] & 0x3);
                keylength = psecuritypriv->DefKeylen[keyindex];
                memcpy(&wepkey[0], iv, 3);
                memcpy(&wepkey[3], &psecuritypriv->DefKey[
                        psecuritypriv->PrivacyKeyIndex].skey[0],
                        keylength);
                length = ((union recv_frame *)precvframe)->
                           u.hdr.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 */
                *((u32 *)crc) = cpu_to_le32(getcrc32(payload, length - 4));
        }
        return;
}

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

static u32 secmicgetuint32(u8 *p)
/* Convert from Byte[] to Us4Byte32 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 Us4Byte32 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 r8712_secmicsetkey(struct mic_data *pmicdata, u8 * key)
{
        /* Set the key */
        pmicdata->K0 = secmicgetuint32(key);
        pmicdata->K1 = secmicgetuint32(key + 4);
        /* and reset the message */
        secmicclear(pmicdata);
}

static void secmicappendbyte(struct mic_data *pmicdata, u8 b)
{
        /* Append the byte to our word-sized buffer */
        pmicdata->M |= ((u32)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 r8712_secmicappend(struct mic_data *pmicdata, u8 * src, u32 nbytes)
{
        /* This is simple */
        while (nbytes > 0) {
                secmicappendbyte(pmicdata, *src++);
                nbytes--;
        }
}

void r8712_secgetmic(struct mic_data *pmicdata, u8 *dst)
{
        /* Append the minimum padding */
        secmicappendbyte(pmicdata, 0x5a);
        secmicappendbyte(pmicdata, 0);
        secmicappendbyte(pmicdata, 0);
        secmicappendbyte(pmicdata, 0);
        secmicappendbyte(pmicdata, 0);
        /* and then zeroes until the length is a multiple of 4 */
        while (pmicdata->nBytesInM != 0)
                secmicappendbyte(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 seccalctkipmic(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};

        r8712_secmicsetkey(&micdata, key);
        priority[0] = pri;
        /* Michael MIC pseudo header: DA, SA, 3 x 0, Priority */
        if (header[1] & 1) {   /* ToDS==1 */
                r8712_secmicappend(&micdata, &header[16], 6);  /* DA */
                if (header[1] & 2)  /* From Ds==1 */
                        r8712_secmicappend(&micdata, &header[24], 6);
                else
                        r8712_secmicappend(&micdata, &header[10], 6);
        } else {        /* ToDS==0 */
                r8712_secmicappend(&micdata, &header[4], 6);   /* DA */
                if (header[1] & 2)  /* From Ds==1 */
                        r8712_secmicappend(&micdata, &header[16], 6);
                else
                        r8712_secmicappend(&micdata, &header[10], 6);
        }
        r8712_secmicappend(&micdata, &priority[0], 4);
        r8712_secmicappend(&micdata, data, data_len);
        r8712_secgetmic(&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 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)
{
        sint  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 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)
{
        sint  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*/
u32 r8712_tkip_encrypt(struct _adapter *padapter, u8 *pxmitframe)
{       /*  exclude ICV */
        u16 pnl;
        u32 pnh;
        u8 rc4key[16];
        u8 ttkey[16];
        u8 crc[4];
        struct arc4context mycontext;
        u32 curfragnum, length, prwskeylen;

        u8 *pframe, *payload, *iv, *prwskey;
        union pn48 txpn;
        struct sta_info *stainfo;
        struct pkt_attrib *pattrib = &((struct xmit_frame *)pxmitframe)->attrib;
        struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
        u32 res = _SUCCESS;

        if (((struct xmit_frame *)pxmitframe)->buf_addr == NULL)
                return _FAIL;

        pframe = ((struct xmit_frame *)pxmitframe)->buf_addr+TXDESC_OFFSET;
        /* 4 start to encrypt each fragment */
        if (pattrib->encrypt == _TKIP_) {
                if (pattrib->psta)
                        stainfo = pattrib->psta;
                else
                        stainfo = r8712_get_stainfo(&padapter->stapriv,
                                  &pattrib->ra[0]);
                if (stainfo != NULL) {
                        prwskey = &stainfo->x_UncstKey.skey[0];
                        prwskeylen = 16;
                        for (curfragnum = 0; curfragnum < pattrib->nr_frags;
                             curfragnum++) {
                                iv = pframe + pattrib->hdrlen;
                                payload = pframe+pattrib->iv_len +
                                          pattrib->hdrlen;
                                GET_TKIP_PN(iv, txpn);
                                pnl = (u16)(txpn.val);
                                pnh = (u32)(txpn.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;
                                        *((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 = (u8 *)RND4((addr_t)(pframe));
                                }
                        }
                } else
                        res = _FAIL;
        }
        return res;
}

/* The hlen doesn't include the IV */
u32 r8712_tkip_decrypt(struct _adapter *padapter, u8 *precvframe)
{       /* exclude ICV */
        u16 pnl;
        u32 pnh;
        u8 rc4key[16];
        u8 ttkey[16];
        u8 crc[4];
        struct arc4context mycontext;
        u32 length, prwskeylen;
        u8 *pframe, *payload, *iv, *prwskey, idx = 0;
        union pn48 txpn;
        struct  sta_info *stainfo;
        struct  rx_pkt_attrib *prxattrib = &((union recv_frame *)
                                           precvframe)->u.hdr.attrib;
        struct  security_priv   *psecuritypriv = &padapter->securitypriv;

        pframe = (unsigned char *)((union recv_frame *)
                                   precvframe)->u.hdr.rx_data;
        /* 4 start to decrypt recvframe */
        if (prxattrib->encrypt == _TKIP_) {
                stainfo = r8712_get_stainfo(&padapter->stapriv,
                                            &prxattrib->ta[0]);
                if (stainfo != NULL) {
                        iv = pframe+prxattrib->hdrlen;
                        payload = pframe+prxattrib->iv_len + prxattrib->hdrlen;
                        length = ((union recv_frame *)precvframe)->
                                 u.hdr.len - prxattrib->hdrlen -
                                 prxattrib->iv_len;
                        if (IS_MCAST(prxattrib->ra)) {
                                idx = iv[3];
                                prwskey = &psecuritypriv->XGrpKey[
                                         ((idx >> 6) & 0x3) - 1].skey[0];
                                if (psecuritypriv->binstallGrpkey == false)
                                        return _FAIL;
                        } else
                                prwskey = &stainfo->x_UncstKey.skey[0];
                        prwskeylen = 16;
                        GET_TKIP_PN(iv, txpn);
                        pnl = (u16)(txpn.val);
                        pnh = (u32)(txpn.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);
                        *((u32 *)crc) = cpu_to_le32(getcrc32(payload,
                                        length - 4));
                        if (crc[3] != payload[length - 1] ||
                            crc[2] != payload[length - 2] ||
                            crc[1] != payload[length - 3] ||
                            crc[0] != payload[length - 4])
                                return _FAIL;
                } else
                        return _FAIL;
        }
        return _SUCCESS;
}

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

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

static const 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
};

/****************************************/
/* aes128k128d()                        */
/* Performs a 128 bit AES encrypt with  */
/* 128 bit data.                        */
/****************************************/
static void xor_128(u8 *a, u8 *b, u8 *out)
{
        sint i;

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

static void xor_32(u8 *a, u8 *b, u8 *out)
{
        sint i;
        for (i = 0; i < 4; i++)
                out[i] = a[i] ^ b[i];
}

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

static void next_key(u8 *key, sint 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)
{
        sint 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)
{
        sint 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 halves */
        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)
{
        sint round;
        sint 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, sint qc_exists, sint a4_exists,
                             u8 *mpdu, uint payload_length, u8 *pn_vector)
{
        sint 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];
        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, sint 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 */
        /* Mute retry, more data and pwr mgt bits */
        mic_header1[3] = mpdu[1] & 0xc7;
        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, sint a4_exists,
                           sint qc_exists)
{
        sint 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, sint a4_exists, sint qc_exists,
                           u8 *mpdu, u8 *pn_vector, sint c)
{
        sint i;

        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;
        if (qc_exists && !a4_exists)
                ctr_preload[1] = mpdu[24] & 0x0f;
        for (i = 2; i < 8; i++)
                ctr_preload[i] = mpdu[i + 8];
        for (i = 8; i < 14; i++)
                ctr_preload[i] = pn_vector[13 - i];
        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)
{
        sint i;

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

static sint aes_cipher(u8 *key, uint    hdrlen,
                        u8 *pframe, uint plen)
{
        uint qc_exists, a4_exists, i, j, payload_remainder;
        uint 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];
        uint    frtype  = GetFrameType(pframe);
        uint    frsubtype  = GetFrameSubType(pframe);

        frsubtype = frsubtype >> 4;
        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 == WLAN_HDR_A3_LEN) || (hdrlen ==  WLAN_HDR_A3_QOS_LEN))
                a4_exists = 0;
        else
                a4_exists = 1;

        if ((frtype == WIFI_DATA_CFACK) ||
             (frtype == WIFI_DATA_CFPOLL) ||
             (frtype == WIFI_DATA_CFACKPOLL)) {
                        qc_exists = 1;
                        if (hdrlen !=  WLAN_HDR_A3_QOS_LEN)
                                hdrlen += 2;
        } else if ((frsubtype == 0x08) ||
                   (frsubtype == 0x09) ||
                   (frsubtype == 0x0a) ||
                   (frsubtype == 0x0b)) {
                        if (hdrlen !=  WLAN_HDR_A3_QOS_LEN)
                                hdrlen += 2;
                        qc_exists = 1;
        } 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 short final block, then pad it,*/
                                      /* encrypt and copy 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;
}

u32 r8712_aes_encrypt(struct _adapter *padapter, u8 *pxmitframe)
{       /* exclude ICV */
        /* Intermediate Buffers */
        sint    curfragnum, length;
        u32     prwskeylen;
        u8      *pframe, *prwskey;
        struct  sta_info *stainfo;
        struct  pkt_attrib  *pattrib = &((struct xmit_frame *)
                                       pxmitframe)->attrib;
        struct  xmit_priv *pxmitpriv = &padapter->xmitpriv;
        u32 res = _SUCCESS;

        if (((struct xmit_frame *)pxmitframe)->buf_addr == NULL)
                return _FAIL;
        pframe = ((struct xmit_frame *)pxmitframe)->buf_addr + TXDESC_OFFSET;
        /* 4 start to encrypt each fragment */
        if ((pattrib->encrypt == _AES_)) {
                if (pattrib->psta)
                        stainfo = pattrib->psta;
                else
                        stainfo = r8712_get_stainfo(&padapter->stapriv,
                                  &pattrib->ra[0]);
                if (stainfo != NULL) {
                        prwskey = &stainfo->x_UncstKey.skey[0];
                        prwskeylen = 16;
                        for (curfragnum = 0; curfragnum < pattrib->nr_frags;
                             curfragnum++) {
                                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 = (u8 *)RND4((addr_t)(pframe));
                                }
                        }
                } else
                        res = _FAIL;
        }
        return res;
}

static sint 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;
        uint 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];
        uint frtype  = GetFrameType(pframe);
        uint frsubtype  = GetFrameSubType(pframe);

        frsubtype = frsubtype >> 4;
        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 */
        /*(plen including llc, payload and mic) */
        num_blocks = (plen - 8) / 16;
        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 == WLAN_HDR_A3_LEN) || (hdrlen ==  WLAN_HDR_A3_QOS_LEN))
                a4_exists = 0;
        else
                a4_exists = 1;
        if ((frtype == WIFI_DATA_CFACK) ||
            (frtype == WIFI_DATA_CFPOLL) ||
            (frtype == WIFI_DATA_CFACKPOLL)) {
                qc_exists = 1;
                if (hdrlen !=  WLAN_HDR_A3_QOS_LEN)
                        hdrlen += 2;
                }  else if ((frsubtype == 0x08) ||
                   (frsubtype == 0x09) ||
                   (frsubtype == 0x0a) ||
                   (frsubtype == 0x0b)) {
                        if (hdrlen !=  WLAN_HDR_A3_QOS_LEN)
                                hdrlen += 2;
                        qc_exists = 1;
        } 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 short final block, 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 */
        memcpy((void *)message, pframe, (hdrlen + plen + 8));
        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 short final block, pad it,*/
                                     /* encrypt and copy 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 + plen];
        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 */
        return _SUCCESS;
}

u32 r8712_aes_decrypt(struct _adapter *padapter, u8 *precvframe)
{       /* exclude ICV */
        /* Intermediate Buffers */
        sint            length;
        u32     prwskeylen;
        u8      *pframe, *prwskey, *iv, idx;
        struct  sta_info *stainfo;
        struct  rx_pkt_attrib *prxattrib = &((union recv_frame *)
                                           precvframe)->u.hdr.attrib;
        struct  security_priv *psecuritypriv = &padapter->securitypriv;

        pframe = (unsigned char *)((union recv_frame*)precvframe)->
                 u.hdr.rx_data;
        /* 4 start to encrypt each fragment */
        if ((prxattrib->encrypt == _AES_)) {
                stainfo = r8712_get_stainfo(&padapter->stapriv,
                                            &prxattrib->ta[0]);
                if (stainfo != NULL) {
                        if (IS_MCAST(prxattrib->ra)) {
                                iv = pframe+prxattrib->hdrlen;
                                idx = iv[3];
                                prwskey = &psecuritypriv->XGrpKey[
                                          ((idx >> 6) & 0x3) - 1].skey[0];
                                if (psecuritypriv->binstallGrpkey == false)
                                        return _FAIL;

                        } else
                                prwskey = &stainfo->x_UncstKey.skey[0];
                        prwskeylen = 16;
                        length = ((union recv_frame *)precvframe)->
                                 u.hdr.len-prxattrib->hdrlen-prxattrib->iv_len;
                        aes_decipher(prwskey, prxattrib->hdrlen, pframe,
                                     length);
                } else
                        return _FAIL;
        }
        return _SUCCESS;
}

void r8712_use_tkipkey_handler(void *FunctionContext)
{
        struct _adapter *padapter = (struct _adapter *)FunctionContext;

        padapter->securitypriv.busetkipkey = true;
}