📄 rtmp_wep.c
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/*
***************************************************************************
* Ralink Tech Inc.
* 4F, No. 2 Technology 5th Rd.
* Science-based Industrial Park
* Hsin-chu, Taiwan, R.O.C.
*
* (c) Copyright 2002-2004, Ralink Technology, Inc.
*
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
* *
************************************************************************
Module Name:
rtmp_wep.c
Abstract:
Revision History:
Who When What
-------- ---------- ----------------------------------------------
Name Date Modification logs
Jan Lee 2005-06-01 Release
*/
#include "rt_config.h"
ULONG FCSTAB_32[256] =
{
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
};
UCHAR WEPKEY[] = {
//IV
0x00, 0x11, 0x22,
//WEP KEY
0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC
};
/*
========================================================================
Routine Description:
Init WEP function.
Arguments:
pAdapter Pointer to our adapter
pKey Pointer to the WEP KEY
KeyId WEP Key ID
KeyLen the length of WEP KEY
pDest Pointer to the destination which Encryption data will store in.
Return Value:
None
IRQL = DISPATCH_LEVEL
Note:
========================================================================
*/
VOID RTMPInitWepEngine(
IN PRT2570ADAPTER pAdapter,
IN PUCHAR pKey,
IN UCHAR KeyId,
IN UCHAR KeyLen,
IN OUT PUCHAR pDest)
{
UINT i;
pAdapter->PrivateInfo.FCSCRC32 = PPPINITFCS32; //Init crc32.
NdisMoveMemory(WEPKEY + 3, pKey, KeyLen);
for(i = 0; i < 3; i++) {
WEPKEY[i] = RandomByte(pAdapter); //Call mlme RandomByte() function.
}
ARCFOUR_INIT(&pAdapter->PrivateInfo.WEPCONTEXT, WEPKEY, KeyLen + 3); //INIT SBOX, KEYLEN+3(IV)
NdisMoveMemory(pDest, WEPKEY, 3); //Append Init Vector
*(pDest+3) = (KeyId << 6); //Append KEYID
}
/*
========================================================================
Routine Description:
Encrypt transimitted data
Arguments:
pAdapter Pointer to our adapter
pSrc Pointer to the transimitted source data that will be encrypt
pDest Pointer to the destination where entryption data will be store in.
Len Indicate the length of the source data
Return Value:
None
IRQL = DISPATCH_LEVEL
Note:
========================================================================
*/
VOID RTMPEncryptData(
IN PRT2570ADAPTER pAdapter,
IN PUCHAR pSrc,
IN PUCHAR pDest,
IN UINT Len)
{
pAdapter->PrivateInfo.FCSCRC32 = RTMP_CALC_FCS32(pAdapter->PrivateInfo.FCSCRC32, pSrc, Len);
ARCFOUR_ENCRYPT(&pAdapter->PrivateInfo.WEPCONTEXT, pDest, pSrc, Len);
}
/*
========================================================================
Routine Description:
Decrypt received data
Arguments:
pAdapter Pointer to our adapter
pSrc Pointer to the received data
Len the length of the received data
Return Value:
TRUE Decrypt WEP data success
FALSE Decrypt WEP data failed
Note:
========================================================================
*/
BOOLEAN RTMPDecryptData(
IN PRT2570ADAPTER pAdapter,
IN PUCHAR pSrc,
IN UINT Len)
{
ULONG trailfcs;
ULONG crc32;
UCHAR KeyIdx;
NdisMoveMemory(WEPKEY, pSrc, 3); //Get WEP IV
KeyIdx = (*(pSrc + 3) & 0xc0) >> 6;
if (pAdapter->PortCfg.SharedKey[KeyIdx].KeyLen == 0)
return (FALSE);
NdisMoveMemory(WEPKEY + 3, pAdapter->PortCfg.SharedKey[KeyIdx].Key, pAdapter->PortCfg.SharedKey[KeyIdx].KeyLen);
ARCFOUR_INIT(&pAdapter->PrivateInfo.WEPCONTEXT, WEPKEY, pAdapter->PortCfg.SharedKey[KeyIdx].KeyLen + 3);
ARCFOUR_DECRYPT(&pAdapter->PrivateInfo.WEPCONTEXT, pSrc, pSrc + 4, Len - 4);
NdisMoveMemory(&trailfcs, pSrc + Len - 8, 4);
crc32 = RTMP_CALC_FCS32(PPPINITFCS32, pSrc, Len - 8); //Skip last 4 bytes(FCS).
crc32 ^= 0xffffffff; /* complement */
if(crc32 != trailfcs)
{
DBGPRINT_RAW(RT_DEBUG_TRACE, "! WEP Data CRC Error !\n"); //CRC error.
return (FALSE);
}
return (TRUE);
}
/*
========================================================================
Routine Description:
The Stream Cipher Encryption Algorithm "ARCFOUR" initialize
Arguments:
Ctx Pointer to ARCFOUR CONTEXT (SBOX)
pKey Pointer to the WEP KEY
KeyLen Indicate the length fo the WEP KEY
Return Value:
None
IRQL = DISPATCH_LEVEL
Note:
========================================================================
*/
VOID ARCFOUR_INIT(
IN PARCFOURCONTEXT Ctx,
IN PUCHAR pKey,
IN UINT KeyLen)
{
UCHAR t, u;
UINT keyindex;
UINT stateindex;
PUCHAR state;
UINT counter;
state = Ctx->STATE;
Ctx->X = 0;
Ctx->Y = 0;
for (counter = 0; counter < 256; counter++)
state[counter] = (UCHAR)counter;
keyindex = 0;
stateindex = 0;
for (counter = 0; counter < 256; counter++)
{
t = state[counter];
stateindex = (stateindex + pKey[keyindex] + t) & 0xff;
u = state[stateindex];
state[stateindex] = t;
state[counter] = u;
if (++keyindex >= KeyLen)
keyindex = 0;
}
}
/*
========================================================================
Routine Description:
Get bytes from ARCFOUR CONTEXT (S-BOX)
Arguments:
Ctx Pointer to ARCFOUR CONTEXT (SBOX)
Return Value:
UCHAR - the value of the ARCFOUR CONTEXT (S-BOX)
Note:
========================================================================
*/
UCHAR ARCFOUR_BYTE(
IN PARCFOURCONTEXT Ctx)
{
UINT x;
UINT y;
UCHAR sx, sy;
PUCHAR state;
state = Ctx->STATE;
x = (Ctx->X + 1) & 0xff;
sx = state[x];
y = (sx + Ctx->Y) & 0xff;
sy = state[y];
Ctx->X = x;
Ctx->Y = y;
state[y] = sx;
state[x] = sy;
return(state[(sx + sy) & 0xff]);
}
/*
========================================================================
Routine Description:
The Stream Cipher Decryption Algorithm
Arguments:
Ctx Pointer to ARCFOUR CONTEXT (SBOX)
pDest Pointer to the Destination
pSrc Pointer to the Source data
Len Indicate the length of the Source data
Return Value:
None
Note:
========================================================================
*/
VOID ARCFOUR_DECRYPT(
IN PARCFOURCONTEXT Ctx,
IN PUCHAR pDest,
IN PUCHAR pSrc,
IN UINT Len)
{
UINT i;
for (i = 0; i < Len; i++)
pDest[i] = pSrc[i] ^ ARCFOUR_BYTE(Ctx);
}
/*
========================================================================
Routine Description:
The Stream Cipher Encryption Algorithm
Arguments:
Ctx Pointer to ARCFOUR CONTEXT (SBOX)
pDest Pointer to the Destination
pSrc Pointer to the Source data
Len Indicate the length of the Source dta
Return Value:
None
IRQL = DISPATCH_LEVEL
Note:
========================================================================
*/
VOID ARCFOUR_ENCRYPT(
IN PARCFOURCONTEXT Ctx,
IN PUCHAR pDest,
IN PUCHAR pSrc,
IN UINT Len)
{
UINT i;
for (i = 0; i < Len; i++)
pDest[i] = pSrc[i] ^ ARCFOUR_BYTE(Ctx);
}
/*
========================================================================
Routine Description:
Calculate a new FCS given the current FCS and the new data.
Arguments:
Fcs the original FCS value
Cp pointer to the data which will be calculate the FCS
Len the length of the data
Return Value:
ULONG - FCS 32 bits
IRQL = DISPATCH_LEVEL
Note:
========================================================================
*/
ULONG RTMP_CALC_FCS32(
IN ULONG Fcs,
IN PUCHAR Cp,
IN INT Len)
{
while (Len--)
Fcs = (((Fcs) >> 8) ^ FCSTAB_32[((Fcs) ^ (*Cp++)) & 0xff]);
return (Fcs);
}
/*
========================================================================
Routine Description:
Get last FCS and encrypt it to the destination
Arguments:
pDest Pointer to the Destination
Return Value:
None
Note:
========================================================================
*/
VOID RTMPSetICV(
IN PRT2570ADAPTER pAdapter,
IN PUCHAR pDest)
{
pAdapter->PrivateInfo.FCSCRC32 ^= 0xffffffff; /* complement */
ARCFOUR_ENCRYPT(&pAdapter->PrivateInfo.WEPCONTEXT, pDest, (PUCHAR) &pAdapter->PrivateInfo.FCSCRC32, 4);
}
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