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366 lines
10 KiB
C
366 lines
10 KiB
C
/*
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***************************************************************************
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* Ralink Tech Inc.
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* 4F, No. 2 Technology 5th Rd.
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* Science-based Industrial Park
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* Hsin-chu, Taiwan, R.O.C.
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*
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* (c) Copyright 2002-2004, Ralink Technology, Inc.
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*
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* All rights reserved. Ralink's source code is an unpublished work and the
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* use of a copyright notice does not imply otherwise. This source code
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* contains confidential trade secret material of Ralink Tech. Any attemp
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* or participation in deciphering, decoding, reverse engineering or in any
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* way altering the source code is stricitly prohibited, unless the prior
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* written consent of Ralink Technology, Inc. is obtained.
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***************************************************************************
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Module Name:
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rtmp_wep.c
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Abstract:
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Revision History:
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Who When What
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-------- ---------- ----------------------------------------------
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Paul Wu 10-28-02 Initial
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*/
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#include "rt_config.h"
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UINT FCSTAB_32[256] =
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{
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
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0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
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0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
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0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
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0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
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0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
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0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
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0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
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0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
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0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
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0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
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0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
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0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
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0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
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0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
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0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
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0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
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0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
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0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
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0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
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0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
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0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
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0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
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0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
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0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
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0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
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0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
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0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
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0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
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0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
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0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
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0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
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0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
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0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
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0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
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0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
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0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
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0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
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0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
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0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
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0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
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0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
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0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
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0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
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0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
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0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
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0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
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0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
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0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
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0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
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0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
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0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
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0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
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0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
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0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
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0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
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0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
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0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
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0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
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0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
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};
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/*
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========================================================================
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Routine Description:
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Calculate a new FCS given the current FCS and the new data.
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Arguments:
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Fcs the original FCS value
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Cp pointer to the data which will be calculate the FCS
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Len the length of the data
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Return Value:
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UINT - FCS 32 bits
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IRQL = DISPATCH_LEVEL
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Note:
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========================================================================
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*/
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UINT RTMP_CALC_FCS32(
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IN UINT Fcs,
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IN PUCHAR Cp,
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IN INT Len)
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{
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while (Len--)
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Fcs = (((Fcs) >> 8) ^ FCSTAB_32[((Fcs) ^ (*Cp++)) & 0xff]);
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return (Fcs);
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}
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/*
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========================================================================
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Routine Description:
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Init WEP function.
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Arguments:
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pAd Pointer to our adapter
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pKey Pointer to the WEP KEY
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KeyId WEP Key ID
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KeyLen the length of WEP KEY
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pDest Pointer to the destination which Encryption data will store in.
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Return Value:
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None
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IRQL = DISPATCH_LEVEL
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Note:
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========================================================================
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*/
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VOID RTMPInitWepEngine(
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IN PUCHAR pIv,
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IN PUCHAR pKey,
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IN UCHAR KeyLen,
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OUT ARC4_CTX_STRUC *pARC4_CTX)
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{
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/* UCHAR seed[16];*/
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PUCHAR seed = NULL;
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UINT8 seed_len;
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os_alloc_mem(NULL, (UCHAR **)&seed, sizeof(UCHAR)*16);
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if (seed == NULL)
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{
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DBGPRINT(RT_DEBUG_ERROR, ("%s: seed Allocate memory fail!!!\n", __FUNCTION__));
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return;
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}
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/* WEP seed construction */
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NdisZeroMemory(seed, 16);
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NdisMoveMemory(seed, pIv, 3);
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NdisMoveMemory(&seed[3], pKey, KeyLen);
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seed_len = 3 + KeyLen;
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/* RC4 uses a pseudo-random number generator (PRNG)
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to generate a key stream */
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ARC4_INIT(pARC4_CTX, &seed[0], seed_len);
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if (seed != NULL)
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os_free_mem(NULL, seed);
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}
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/*
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========================================================================
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Routine Description:
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Construct WEP IV header.
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Arguments:
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Return Value:
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Note:
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It's a 4-octets header.
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========================================================================
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*/
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VOID RTMPConstructWEPIVHdr(
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IN UINT8 key_idx,
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IN UCHAR *pn,
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OUT UCHAR *iv_hdr)
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{
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NdisZeroMemory(iv_hdr, LEN_WEP_IV_HDR);
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NdisMoveMemory(iv_hdr, pn, LEN_WEP_TSC);
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/* Append key index */
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iv_hdr[3] = (key_idx << 6);
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}
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/*
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========================================================================
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Routine Description:
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WEP MPDU cryptographic encapsulation
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Arguments:
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pAdapter Pointer to our adapter
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pSrc Pointer to the received data
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Len the length of the received data
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Return Value:
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Note:
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========================================================================
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*/
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BOOLEAN RTMPSoftEncryptWEP(
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IN PRTMP_ADAPTER pAd,
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IN PUCHAR pIvHdr,
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IN PCIPHER_KEY pKey,
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INOUT PUCHAR pData,
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IN ULONG DataByteCnt)
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{
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ARC4_CTX_STRUC *ARC4_CTX = NULL;
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UINT FCSCRC32;
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os_alloc_mem(NULL, (UCHAR **)&ARC4_CTX, sizeof(ARC4_CTX_STRUC));
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if (ARC4_CTX == NULL)
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{
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DBGPRINT(RT_DEBUG_ERROR, ("%s: ARC4_CTX Allocate memory fail!!!\n", __FUNCTION__));
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return FALSE;
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}
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if (pKey->KeyLen == 0)
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{
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DBGPRINT(RT_DEBUG_ERROR, ("%s : The key is empty !\n", __FUNCTION__));
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return FALSE;
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}
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/* Initialize WEP key stream */
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RTMPInitWepEngine(pIvHdr,
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pKey->Key,
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pKey->KeyLen,
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ARC4_CTX);
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/* WEP computes the ICV over the plaintext data */
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FCSCRC32 = RTMP_CALC_FCS32(PPPINITFCS32, pData, DataByteCnt);
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FCSCRC32 ^= 0xffffffff; /* complement */
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FCSCRC32 = cpu2le32(FCSCRC32);
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/* Append 4-bytes ICV after the MPDU data */
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NdisMoveMemory(pData + DataByteCnt, (PUCHAR)&FCSCRC32, LEN_ICV);
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/* Encrypt the MPDU plaintext data and ICV using ARC4 with a seed */
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ARC4_Compute(ARC4_CTX, pData, DataByteCnt + LEN_ICV, pData);
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if (ARC4_CTX != NULL)
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os_free_mem(NULL, ARC4_CTX);
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return TRUE;
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}
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/*
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========================================================================
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Routine Description:
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Decrypt received WEP data
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Arguments:
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pAdapter Pointer to our adapter
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pSrc Pointer to the received data
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Len the length of the received data
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Return Value:
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TRUE Decrypt WEP data success
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FALSE Decrypt WEP data failed
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Note:
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========================================================================
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*/
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BOOLEAN RTMPSoftDecryptWEP(
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IN PRTMP_ADAPTER pAd,
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IN PCIPHER_KEY pKey,
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INOUT PUCHAR pData,
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INOUT UINT16 *DataByteCnt)
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{
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/*ARC4_CTX_STRUC ARC4_CTX;*/
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ARC4_CTX_STRUC *ARC4_CTX = NULL;
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PUCHAR plaintext_ptr;
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UINT16 plaintext_len;
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PUCHAR ciphertext_ptr;
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UINT16 ciphertext_len;
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UINT trailfcs;
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UINT crc32;
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os_alloc_mem(NULL, (UCHAR **)&ARC4_CTX, sizeof(ARC4_CTX_STRUC));
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if (ARC4_CTX == NULL)
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{
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DBGPRINT(RT_DEBUG_ERROR, ("%s: ARC4_CTX Allocate memory fail!!!\n", __FUNCTION__));
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return FALSE;
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}
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if (pKey->KeyLen == 0)
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{
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DBGPRINT(RT_DEBUG_ERROR, ("%s : The key is not available !\n", __FUNCTION__));
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return FALSE;
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}
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/* Initialize WEP key stream */
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RTMPInitWepEngine(pData,
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pKey->Key,
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pKey->KeyLen,
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ARC4_CTX);
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/* Skip the WEP IV header (4-bytes) */
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ciphertext_ptr = pData + LEN_WEP_IV_HDR;
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ciphertext_len = *DataByteCnt - LEN_WEP_IV_HDR;
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/* Decrypt the WEP MPDU. It shall include plaintext and ICV.
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The result output would overwrite the original WEP IV header position */
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ARC4_Compute(ARC4_CTX,
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ciphertext_ptr,
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ciphertext_len,
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pData);
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/* Point to the decrypted data frame and its length shall exclude ICV length */
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plaintext_ptr = pData;
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plaintext_len = ciphertext_len - LEN_ICV;
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/* Extract peer's the ICV */
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NdisMoveMemory(&trailfcs, plaintext_ptr + plaintext_len, LEN_ICV);
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/* WEP recomputes the ICV and
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bit-wise compares it with the decrypted ICV from the MPDU. */
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crc32 = RTMP_CALC_FCS32(PPPINITFCS32, plaintext_ptr, plaintext_len);
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crc32 ^= 0xffffffff; /* complement */
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if(crc32 != cpu2le32(trailfcs))
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{
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DBGPRINT(RT_DEBUG_ERROR, ("! WEP Data CRC Error !\n")); /*CRC error.*/
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return FALSE;
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}
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/* Update the total data length */
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*DataByteCnt = plaintext_len;
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if (ARC4_CTX != NULL)
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os_free_mem(NULL, ARC4_CTX);
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return TRUE;
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}
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