/*

* Copyright (c) 2005 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:    implementation

*

*/

#ifndef MSRTPCRYPTOHANDLERCONTEXTRTP_H

#define MSRTPCRYPTOHANDLERCONTEXTRTP_H

#include <e32std.h>

#include "msrtpcryptohandlercontext.h"

// CLASS DECLARATION

/*

* A context for stream classes for using RTP-specific crypto handling operations.

*

*  @lib n/a

*/

class MSRTPCryptoHandlerContextRTP: public MSRTPCryptoHandlerContext

	{	

    public: // New functions  

        /*

        * Determines the index i

        * of an SRTP packet with given sequence number SEQ on sender's side.         

        * @return void        

        */

	    virtual void CountSenderPacketIndexL() = 0;	    

        /*

        * Implements pseudocode on RFC 3711 Appendix A

        * for determining the index i of an SRTP packet with given sequence number SEQ

        * and current s_l value in receiver side

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

        * @return void                

        */

        virtual void CountReceiverPacketIndexL() = 0;

        /*

        * Conditionally update ROC in sender's side:

        * Each time SEQ wraps MOD 2^16, the sender side must 

        * increment ROC by one MOD 2^32.

        * @return void                

        */

        virtual void UpdateROC() = 0;

        /*

        * Conditionally update s_l and ROC based on v value. 

        * See RFC 3711 section 3.3.1 for more information

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

        * @return void                

        */

        virtual void Update_s_l_and_RocL() = 0;

        /*

        * Assign receiver counter s_l to the value of first sequence number. 

        * @return void                

        */

        virtual void SetReceiver_s_l() = 0;

	};

#endif  //MSRTPCryptoHandlerContextRTP_H