drivers/staging/otus/80211core/cwep.c - kernel/windcharger - Git at Google

 /*
  * Copyright (c) 2007-2008 Atheros Communications Inc.
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 /*                                                                      */
 /*  Module Name : cwep.c                                                */
 /*                                                                      */
 /*  Abstract                                                            */
 /*      This module contains Tx and Rx functions.                       */
 /*                                                                      */
 /*  NOTES                                                               */
 /*      None                                                            */
 /*                                                                      */
 /************************************************************************/
 #include "cprecomp.h"

 u32_t crc32_tab[] =
 {
        0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
        0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
        0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
        0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
        0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
        0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
        0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
        0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
        0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
        0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
        0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
        0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
        0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
        0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
        0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
        0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
        0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
        0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
        0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
        0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
        0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
        0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
        0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
        0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
        0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
        0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
        0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
        0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
        0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
        0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
        0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
        0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
        0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
        0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
        0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
        0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
        0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
        0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
        0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
        0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
        0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
        0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
        0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
        0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
        0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
        0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
        0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
        0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
        0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
        0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
        0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
        0x2d02ef8dL
 };

 void zfWEPEncrypt(zdev_t *dev, zbuf_t *buf, u8_t *snap, u16_t snapLen, u16_t offset, u8_t keyLen, u8_t* WepKey, u8_t *iv)
 {
     u8_t    S[256],S2[256];
     u16_t   ui;
     u16_t   i;
     u16_t   j;
     u8_t    temp;
     u8_t    K;
     u32_t   ltemp;
     u16_t   len;
     u32_t   icv;
     u8_t    key[32];

     key[0] = iv[0];
     key[1] = iv[1];
     key[2] = iv[2];

     /* Append Wep Key after IV */
     zfMemoryCopy(&key[3], WepKey, keyLen);

     keyLen += 3;

     for(i = 0; i < 256; i++)
     {
         S[i] = (u8_t)i;
         S2[i] = key[i&(keyLen-1)];
     }

     j = 0;
     for(i = 0; i < 256; i++)
     {
         j = (j + S[i] + S2[i]) ;
         j&=255 ;

         // Swap S[i] and S[j]
         temp = S[i];
         S[i] = S[j];
         S[j] = temp;
     }

     i = j = 0;
     icv = -1;

     /* For Snap Header */
     for (ui = 0; ui < snapLen; ui++)
     {
         u8_t In;

         i++;
         i &= 255;
         j += S[i];
         j &= 255;

         // Swap S[i] and S[j]
         temp = S[i];
         S[i] = S[j];
         S[j] = temp;
 //          temp = (S[i] + temp) & 255;
         temp += S[i];
         temp &=255;
         K = S[temp];        // Key used to Xor with input data

         In = snap[ui];
         icv =  (icv>>8) ^ crc32_tab[(icv^In)&0xff];

         snap[ui] = In ^ K;
         //zmw_tx_buf_writeb(dev, buf, ui, In ^ K);
     }

     len = zfwBufGetSize(dev, buf);

     for (ui = offset; ui < len; ui++)
     {
         u8_t In;

         i++;
         i &= 255;
         j += S[i];
         j &= 255;

         // Swap S[i] and S[j]
         temp = S[i];
         S[i] = S[j];
         S[j] = temp;
 //          temp = (S[i] + temp) & 255;
         temp += S[i];
         temp &=255;
         K = S[temp];        // Key used to Xor with input data

         In = zmw_tx_buf_readb(dev, buf, ui);
         icv =  (icv>>8) ^ crc32_tab[(icv^In)&0xff];

         zmw_tx_buf_writeb(dev, buf, ui, In ^ K);
     } //End of for (ui = 0; ui < Num_Bytes; ui++)

     icv = ~(icv);
     ltemp = (u32_t) icv;

     for (ui = 0; ui < 4; ui++)
     {
         i ++;
         i &= 255;
         j += S[i];
         j &= 255;

         // Swap S[i] and S[j]
         temp = S[i];
         S[i] = S[j];
         S[j] = temp;
         temp += S[i];
         temp &= 255;
         K = S[temp];        // Key used to Xor with input data

         //*Out++ = (u8_t)(ltemp ^ K)&0xff;
         zmw_tx_buf_writeb(dev, buf, len+ui, (u8_t)(ltemp ^ K)&0xff);
         ltemp >>= 8;
     }

     zfwBufSetSize(dev, buf, len+4);
 }

 u16_t zfWEPDecrypt(zdev_t *dev, zbuf_t *buf, u16_t offset, u8_t keyLen, u8_t* WepKey, u8_t *iv)
 {
     u8_t    S[256];
     u8_t    S2[256];
     u16_t   ui;
     u16_t   i;
     u16_t   j;
     u32_t   icv_tmp;
     u32_t   *icv;
     u32_t   rxbuf_icv;
     u8_t    temp;
     u8_t    K;
     u16_t   len;
     u8_t    key[32];

     /* Retrieve IV */
     key[0] = iv[0];
     key[1] = iv[1];
     key[2] = iv[2];

     /* Append Wep Key after IV */
     zfMemoryCopy(&key[3], WepKey, keyLen);

     keyLen += 3;

     for(i = 0; i < 256; i++)
     {
         S[i] = (u8_t)i;
         S2[i] = key[i&(keyLen-1)];
     }

     j = 0;
     for(i = 0; i < 256; i++)
     {
         j = (j + S[i] + S2[i]);
         j&=255 ;

         // Swap S[i] and S[j]
         temp = S[i];
         S[i] = S[j];
         S[j] = temp;
     }

     i = j = 0;

     len = zfwBufGetSize(dev, buf);

     for (ui = offset; ui < len; ui++)
     {
         u8_t In;

         i++;
         i &= 255;
         j += S[i];
         j &= 255;

         // Swap S[i] and S[j]
         temp = S[i];
         S[i] = S[j];
         S[j] = temp;
 //          temp = (S[i] + temp) & 255;
         temp += S[i];
         temp &=255;
         K = S[temp];        // Key used to Xor with input data

         In = zmw_rx_buf_readb(dev, buf, ui);

         zmw_rx_buf_writeb(dev, buf, ui, In ^ K);
     } //End of for (ui = 0; ui < Num_Bytes; ui++)

     icv = &icv_tmp;
     *icv = -1;

     for (ui = offset; ui < len - 4; ui++)
     {
         u8_t In;

         In = zmw_rx_buf_readb(dev, buf, ui);
         *icv =  (*icv>>8) ^ crc32_tab[(*icv^In)&0xff];
     }

     *icv = ~*icv;

     rxbuf_icv = (zmw_rx_buf_readb(dev, buf, len-4) |
          zmw_rx_buf_readb(dev, buf, len-3) << 8 |
          zmw_rx_buf_readb(dev, buf, len-2) << 16 |
          zmw_rx_buf_readb(dev, buf, len-1) << 24);

     if (*icv != rxbuf_icv)
     {
         return ZM_ICV_FAILURE;
     }

     return ZM_ICV_SUCCESS;
 }
	/*
	* Copyright (c) 2007-2008 Atheros Communications Inc.
	*
	* Permission to use, copy, modify, and/or distribute this software for any
	* purpose with or without fee is hereby granted, provided that the above
	* copyright notice and this permission notice appear in all copies.
	*
	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	*/
	/* */
	/* Module Name : cwep.c */
	/* */
	/* Abstract */
	/* This module contains Tx and Rx functions. */
	/* */
	/* NOTES */
	/* None */
	/* */
	/************************************************************************/
	#include "cprecomp.h"

	u32_t crc32_tab[] =
	{
	0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
	0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
	0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
	0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
	0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
	0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
	0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
	0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
	0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
	0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
	0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
	0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
	0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
	0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
	0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
	0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
	0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
	0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
	0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
	0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
	0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
	0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
	0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
	0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
	0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
	0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
	0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
	0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
	0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
	0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
	0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
	0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
	0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
	0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
	0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
	0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
	0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
	0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
	0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
	0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
	0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
	0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
	0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
	0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
	0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
	0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
	0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
	0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
	0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
	0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
	0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
	0x2d02ef8dL
	};

	void zfWEPEncrypt(zdev_t dev, zbuf_t buf, u8_t snap, u16_t snapLen, u16_t offset, u8_t keyLen, u8_t WepKey, u8_t *iv)
	{
	u8_t S[256],S2[256];
	u16_t ui;
	u16_t i;
	u16_t j;
	u8_t temp;
	u8_t K;
	u32_t ltemp;
	u16_t len;
	u32_t icv;
	u8_t key[32];

	key[0] = iv[0];
	key[1] = iv[1];
	key[2] = iv[2];

	/* Append Wep Key after IV */
	zfMemoryCopy(&key[3], WepKey, keyLen);

	keyLen += 3;

	for(i = 0; i < 256; i++)
	{
	S[i] = (u8_t)i;
	S2[i] = key[i&(keyLen-1)];
	}

	j = 0;
	for(i = 0; i < 256; i++)
	{
	j = (j + S[i] + S2[i]) ;
	j&=255 ;

	// Swap S[i] and S[j]
	temp = S[i];
	S[i] = S[j];
	S[j] = temp;
	}

	i = j = 0;
	icv = -1;

	/* For Snap Header */
	for (ui = 0; ui < snapLen; ui++)
	{
	u8_t In;

	i++;
	i &= 255;
	j += S[i];
	j &= 255;

	// Swap S[i] and S[j]
	temp = S[i];
	S[i] = S[j];
	S[j] = temp;
	// temp = (S[i] + temp) & 255;
	temp += S[i];
	temp &=255;
	K = S[temp]; // Key used to Xor with input data

	In = snap[ui];
	icv = (icv>>8) ^ crc32_tab[(icv^In)&0xff];

	snap[ui] = In ^ K;
	//zmw_tx_buf_writeb(dev, buf, ui, In ^ K);
	}

	len = zfwBufGetSize(dev, buf);

	for (ui = offset; ui < len; ui++)
	{
	u8_t In;

	i++;
	i &= 255;
	j += S[i];
	j &= 255;

	// Swap S[i] and S[j]
	temp = S[i];
	S[i] = S[j];
	S[j] = temp;
	// temp = (S[i] + temp) & 255;
	temp += S[i];
	temp &=255;
	K = S[temp]; // Key used to Xor with input data

	In = zmw_tx_buf_readb(dev, buf, ui);
	icv = (icv>>8) ^ crc32_tab[(icv^In)&0xff];

	zmw_tx_buf_writeb(dev, buf, ui, In ^ K);
	} //End of for (ui = 0; ui < Num_Bytes; ui++)

	icv = ~(icv);
	ltemp = (u32_t) icv;

	for (ui = 0; ui < 4; ui++)
	{
	i ++;
	i &= 255;
	j += S[i];
	j &= 255;

	// Swap S[i] and S[j]
	temp = S[i];
	S[i] = S[j];
	S[j] = temp;
	temp += S[i];
	temp &= 255;
	K = S[temp]; // Key used to Xor with input data

	//*Out++ = (u8_t)(ltemp ^ K)&0xff;
	zmw_tx_buf_writeb(dev, buf, len+ui, (u8_t)(ltemp ^ K)&0xff);
	ltemp >>= 8;
	}

	zfwBufSetSize(dev, buf, len+4);
	}

	u16_t zfWEPDecrypt(zdev_t dev, zbuf_t buf, u16_t offset, u8_t keyLen, u8_t* WepKey, u8_t *iv)
	{
	u8_t S[256];
	u8_t S2[256];
	u16_t ui;
	u16_t i;
	u16_t j;
	u32_t icv_tmp;
	u32_t *icv;
	u32_t rxbuf_icv;
	u8_t temp;
	u8_t K;
	u16_t len;
	u8_t key[32];

	/* Retrieve IV */
	key[0] = iv[0];
	key[1] = iv[1];
	key[2] = iv[2];

	/* Append Wep Key after IV */
	zfMemoryCopy(&key[3], WepKey, keyLen);

	keyLen += 3;

	for(i = 0; i < 256; i++)
	{
	S[i] = (u8_t)i;
	S2[i] = key[i&(keyLen-1)];
	}

	j = 0;
	for(i = 0; i < 256; i++)
	{
	j = (j + S[i] + S2[i]);
	j&=255 ;

	// Swap S[i] and S[j]
	temp = S[i];
	S[i] = S[j];
	S[j] = temp;
	}

	i = j = 0;

	len = zfwBufGetSize(dev, buf);

	for (ui = offset; ui < len; ui++)
	{
	u8_t In;

	i++;
	i &= 255;
	j += S[i];
	j &= 255;

	// Swap S[i] and S[j]
	temp = S[i];
	S[i] = S[j];
	S[j] = temp;
	// temp = (S[i] + temp) & 255;
	temp += S[i];
	temp &=255;
	K = S[temp]; // Key used to Xor with input data

	In = zmw_rx_buf_readb(dev, buf, ui);

	zmw_rx_buf_writeb(dev, buf, ui, In ^ K);
	} //End of for (ui = 0; ui < Num_Bytes; ui++)

	icv = &icv_tmp;
	*icv = -1;

	for (ui = offset; ui < len - 4; ui++)
	{
	u8_t In;

	In = zmw_rx_buf_readb(dev, buf, ui);
	icv = (icv>>8) ^ crc32_tab[(*icv^In)&0xff];
	}

	icv = ~icv;

	rxbuf_icv = (zmw_rx_buf_readb(dev, buf, len-4) \|
	zmw_rx_buf_readb(dev, buf, len-3) << 8 \|
	zmw_rx_buf_readb(dev, buf, len-2) << 16 \|
	zmw_rx_buf_readb(dev, buf, len-1) << 24);

	if (*icv != rxbuf_icv)
	{
	return ZM_ICV_FAILURE;
	}

	return ZM_ICV_SUCCESS;
	}