/*

* Copyright (c) 2004 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:    SRTP packet class (SRTP)

*

*/

#ifndef __SRTP_PACKET_SRTP_H__

#define __SRTP_PACKET_SRTP_H__

// INCLUDES

#include <in_sock.h>

#include "srtppacket.h"

#include "srtppacketrtp.h"

// FORWARD DECLARATIONS

class CSRTPCryptoHandler;

/**

* Contains general SRTP-specific packet routines

*/

class CSRTPPacketSRTP : public CSRTPPacketRTP

    {

    public:

        /**

	    * Constructor.

	    * @param aPacket a SRTP packet

	    * @param aHandler the cryptohandler for this packet

	    * @leave KErrNone if success, system-wide error code otherwise

	    */

    	static CSRTPPacketSRTP* NewL(const TDesC8& aPacket,

                      CSRTPCryptoHandler& aHandler);

        /**

        * Get authentication tag

        * @return authentication tag

        */                                      

        TPtrC8 AuthenticationTag();                      

        /**

        * Get master key identifier

        * @return TPtrC8 master key identifier

        */                                      

        TPtrC8 MasterKeyIdentifier();

        /**

        * Allocate size for decrypted packet and copy payload + header

        * @return HBufC8* decrypted packet

        */                                      

        HBufC8* CreateDecryptedPacketL(TUint8* aDecryptedPayloadPtr);

    private: //methods

        CSRTPPacketSRTP (const TDesC8& aPacket,

                      CSRTPCryptoHandler& aHandler);

        ~CSRTPPacketSRTP();                

        void ConstructL();          

        /**

        * Update payload length information

        * @return void

        */                              

        void UpdatePayloadLengthL();

        /**

        * Update authentication tag

        * @return void

        */                                      

        void UpdateAuthenticationTagL();        

        /**

        * Update master key identifier

        * @return void

        */                                      

        void UpdateMasterKeyIdentifier();            

        /**

        * Count size of the decrypted packet

        * @return TUint size of the decrypted packet

        */                                      

        TUint CountDecryptedPacketSize();    

        /*

        * Read Master Key Identifier (MKI) from packet

        * @return TPtrC8 pointer to MKI

        */                                            

        TPtrC8 GetAuthenticationTagL();   

        /*

        * Read Master Key Identifier (MKI) from packet

        * @return TPtrC8 pointer to MKI

        */                                            

        TPtrC8 GetMasterKeyIdentifier();        

    private: //data

        TPtrC8                 iAuthenticationTag;   // auth. tag

        TPtrC8                 iMasterKeyIdentifier; // MKI

    };

#endif // __SRTP_PACKET_SRTP_H__