/******************* © Marvell Semiconductor, Inc., 2001-2004 *****************
 *
 *  Purpose:    This module provides software WEP implementation
 *
 *	$Author: schiu $
 *
 *	$Date: 2004/08/20 $
 *
 *	$Revision: #1 $
 *
 *****************************************************************************/

/* 
===============================================================================
                                 INCLUDE FILES
===============================================================================
*/
#include "precomp.h"

/*
===============================================================================
                       DEFINITIONS AND GLOBAL TABLES
===============================================================================
*/
#define MAXKEYLEN 13

static unsigned long  crc32_table[256]={
	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
};

/*
===============================================================================
                           CODED PUBLIC PROCEDURES
===============================================================================
*/

/******************************************************************************
 *
 *  Name: WEP_Encrypt()
 *
 *  Description:        To perform RC4 WEP encryption for Tx packet
 *
 *  Conditions for Use: When the WEP status is set to use WEP, every Tx packet needs to be encrypted, HW will
 *                      handle Rx packet WEP. 4 bytes of space will be reserved for IV and key ID, 6 bytes of
 *                      LLC and Ip payload should be prepared in the buffer before calling the function
 *
 *  Arguments:          PMRVDRV_ADAPTER Adapter     
 *                      PUCHAR         Buf (Include space for 3 byte IV, 1 byte Key ID, LLC, IP payload and ICV
 *                      INT            Len (Specify length between LLC to end of IP payload)
 *    
 *  Return Value:        
 * 
 *  Notes:               
 *
 *****************************************************************************/
VOID
WEP_Encrypt(
	IN PMRVDRV_ADAPTER Adapter,
    IN PUCHAR Buf,
    IN ULONG Len)
{

	unsigned long i, j, k, crc;
	unsigned char kpos, *pos;
	//unsigned char *ps, *pk;
    unsigned char klen;
    unsigned char SArr[256];
    unsigned char KeyArr[MAXKEYLEN + 3];

    DBGPRINT(DBG_WEP,(L"+WEP_Encrypt()"));
     
	Adapter->IV++;

    //ps = &SArr[0]; 
    //pk = &KeyArr[0];

	/* Prepend 24-bit IV to RC4 key and TX frame */
	 pos = Buf;
	*pos++ = KeyArr[0] = (UCHAR)((Adapter->IV >> 16) & 0x000000ff);
	*pos++ = KeyArr[1] = (UCHAR)((Adapter->IV >> 8)  & 0x000000ff);
	*pos++ = KeyArr[2] = (UCHAR)(Adapter->IV & 0x000000ff);
    *pos++ = (UCHAR)(Adapter->CurrentWEPKey.KeyIndex) << 6;
	
	if( Adapter->CurrentWEPKey.KeyLength == 5 ) //40 bit
	    klen = 3 + 5;
    else
	    klen = 3 + 13; //128 bit
	for(i=0; i<Adapter->CurrentWEPKey.KeyLength; i++)// Move WEP key to key array
        KeyArr[3+i]= Adapter->CurrentWEPKey.KeyMaterial[i];
	
	/*      Setup RC4 state */
	{
		for (i = 0; i < 256; i++)
			SArr[i] = (unsigned char)i;
		j = 0;
		kpos = 0;
		for (i = 0; i < 256; i++) {
			j = (j + SArr[i] + KeyArr[kpos]) & 0xff;
			kpos++;
			if (kpos >= klen)
				kpos = 0;
			S_SWAP(i, j);
		}
	}
	
	/*      Compute CRC32 over unencrypted data and apply RC4 to data */
	crc = ~0;
	i = j = 0;
	for (k = 0; k < Len; k++) {
		crc = crc32_table[(crc ^ *pos) & 0xff] ^ (crc >> 8);
		i = (i + 1) & 0xff;
		j = (j + SArr[i]) & 0xff;
		S_SWAP(i, j);
		*pos++ ^= SArr[(SArr[i] + SArr[j]) & 0xff];
	}
	crc = ~crc;

	/*      Append little-endian CRC32 and encrypt it to produce ICV */
	pos[0] = (unsigned char)(crc&0x000000ff);
	pos[1] = (unsigned char)((crc>>8 )&0x000000ff);
	pos[2] = (unsigned char)((crc>>16)&0x000000ff);
	pos[3] = (unsigned char)((crc>>24)&0x000000ff);
	for (k = 0; k < 4; k++) {
		i = (i + 1) & 0xff;
		j = (j + SArr[i]) & 0xff;
		S_SWAP(i, j);
		*pos++ ^= SArr[(SArr[i] + SArr[j]) & 0xff];
	}

}


//
//	WINXP specific functions
//
/******************************************************************************
 *
 *  Name: AddWEPKey()
 *
 *  Description: 
 *
 *  Conditions for Use:   
 *
 *  Arguments:           
 *    
 *  Return Value:        
 * 
 *  Notes:               
 *
 *****************************************************************************/
NDIS_STATUS
AddWEPKey(
	IN PMRVDRV_ADAPTER Adapter,
    IN PNDIS_802_11_SSID pInputSSID,
    IN PNDIS_802_11_WEP pWEP
)
{
    ULONG i, Index, KIndex, ulSize;
    PMRVL_WEP_INFO pMWI;
    PMRVL_WEP_KEY pDestKey;

	DBGPRINT(DBG_WEP,(L"+AddWEPKey() %s\n",pInputSSID -> Ssid));
    //      10/08/02 - Check if it is a global key, we do not keep per-client key in the table
    if( !(pWEP->KeyIndex & 0x80000000) )
        return NDIS_STATUS_NOT_ACCEPTED;

    KIndex = pWEP->KeyIndex & 0x7fffffff;
    //      Compare SSID to locate the entry index
    for(i=0; i<Adapter->NoOfWEPEntry; i++){
        pMWI = &(Adapter->WEP_INFO_LIST[i]);
   		if ( NdisEqualMemory(pInputSSID, 
							 &(pMWI->SSID), 
							 sizeof(NDIS_802_11_SSID)) ){
			break;
		}
    }

    Index = i;
    if( Index == Adapter->NoOfWEPEntry ) 
        Adapter->NoOfWEPEntry++;
    pMWI = &(Adapter->WEP_INFO_LIST[Index]);
    pMWI->LastKeyIndex = KIndex;
    pDestKey = &(pMWI->KEY[KIndex]);


    NdisZeroMemory(pDestKey, sizeof(MRVL_WEP_KEY));
    if(pWEP->KeyLength == 5) // We assume 40 and 104 bits WEP
        ulSize = sizeof(MRVL_WEP_KEY) - 11;
    else
        ulSize = sizeof(MRVL_WEP_KEY) - 3;
    NdisMoveMemory(&(pMWI->SSID), pInputSSID, sizeof(NDIS_802_11_SSID));
    NdisMoveMemory(pDestKey, pWEP, ulSize);

    DBGPRINT(DBG_WEP|DBG_HELP,(L"**** MISC - Add SSID %s and KEY Index %d to table entry %d ****\n", pMWI->SSID.Ssid, KIndex, Index));
    return NDIS_STATUS_SUCCESS;
}

/******************************************************************************
 *
 *  Name: RemoveWEPKey()
 *
 *  Description: 
 *
 *  Conditions for Use:   
 *
 *  Arguments:           
 *    
 *  Return Value:        
 * 
 *  Notes:               
 *
 *****************************************************************************/
NDIS_STATUS
RemoveWEPKey(
	IN PMRVDRV_ADAPTER Adapter,
    IN PNDIS_802_11_SSID pInputSSID,
    IN PNDIS_802_11_WEP pWEP
)
{
    ULONG i, Index, KIndex;
    // ULONG ulSize;
    PMRVL_WEP_INFO pMWI;
    PMRVL_WEP_KEY pDestKey;

	DBGPRINT(DBG_WEP | DBG_CRLF,(L"+RemoveWEPKey()\n"));

    //      10/08/02 - Check if it is a global key, we do not keep per-client key in the table
    if( !(pWEP->KeyIndex & 0x80000000) ) {
     
	    DBGPRINT(DBG_WEP|DBG_HELP,(L"Per client Key not accepted.\n"));
		return NDIS_STATUS_NOT_ACCEPTED;
	}

    KIndex = pWEP->KeyIndex & 0x7fffffff;
    //      Compare SSID to locate the entry index
    for(i=0; i<Adapter->NoOfWEPEntry; i++){
        pMWI = &(Adapter->WEP_INFO_LIST[i]);
   		if ( NdisEqualMemory(pInputSSID, 
							 &(pMWI->SSID), 
							 sizeof(NDIS_802_11_SSID)) ){
			break;
		}
    }

    Index = i;
	// could not find matching SSID, the key is not even in the WEP table
    if( Index == Adapter->NoOfWEPEntry ) 
		return NDIS_STATUS_SUCCESS;

	// remove the WEP key 
    pMWI = &(Adapter->WEP_INFO_LIST[Index]);
    pDestKey = &(pMWI->KEY[KIndex]);
    NdisZeroMemory(pDestKey, sizeof(MRVL_WEP_KEY));

    DBGPRINT(DBG_WEP,(L"**** MISC - Remove SSID %s KEY Index %d from table entry %d ****\n", pMWI->SSID.Ssid, KIndex, Index));
    return NDIS_STATUS_SUCCESS;
}

/******************************************************************************
 *
 *  Name: SearchWEPKey()
 *
 *  Description: 
 *
 *  Conditions for Use:   
 *
 *  Arguments:           
 *    
 *  Return Value:        
 * 
 *  Notes:               
 *
 *****************************************************************************/
NDIS_STATUS
SearchWEPKey(
	IN PMRVDRV_ADAPTER Adapter,
    IN PNDIS_802_11_SSID pInputSSID,
    OUT PNDIS_802_11_WEP pWEP
)
{
    ULONG i, Index, KIndex, ulSize;
    PMRVL_WEP_INFO pMWI;
    PMRVL_WEP_KEY pDestKey;

    //      Compare SSID to locate the entry index
    for(i=0; i<Adapter->NoOfWEPEntry; i++){
        pMWI = &(Adapter->WEP_INFO_LIST[i]);
   		if ( NdisEqualMemory(pInputSSID, 
							 &(pMWI->SSID), 
							 sizeof(NDIS_802_11_SSID)) ){
			break;
		}
    }

    if( i == Adapter->NoOfWEPEntry )
        return NDIS_STATUS_FAILURE;
    
    Index = i;
    pMWI = &(Adapter->WEP_INFO_LIST[Index]);
    KIndex = pMWI->LastKeyIndex;
    pDestKey = &(pMWI->KEY[KIndex]);
    if(pWEP->KeyLength == 5)  // We assume 40 and 104 bits WEP
        ulSize = sizeof(MRVL_WEP_KEY) - 11;
    else
        ulSize = sizeof(MRVL_WEP_KEY) - 3;

    NdisMoveMemory(pWEP, pDestKey, ulSize);

    DBGPRINT(DBG_WEP|DBG_HELP,(L"**** MISC - Found SSID %s and KEY Index %d from table entry %d ****\n", pMWI->SSID.Ssid, KIndex, Index));
    return NDIS_STATUS_SUCCESS;
}

