/*

* 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:    Contains a default cryptographic context for SRTP/SRTCP streams.

*

*/

#ifndef __SRTP_CRYPTOPARAMS_H__

#define __SRTP_CRYPTOPARAMS_H__

#include <e32base.h>

#include "srtpcryptocontext.h"

/**

*  SRTP/SRTCP crypto context param 

*  RFC 3711, 4568

*

*  @lib srtp.dll

*/

/**

* Encyption algorithms.

*/

enum TSRTPEncAlg

    {

    ENullAlg = 0,

    EEncAES_CM

    };

/**

* Authentication algorithms.

* With RCCm1, RCCm2 and RCCm3, ROC will be synchronized if SEQ%R==0

*/

enum TSRTPAuthAlg

    {

    EAuthNull = 0,

    EAuthHMAC_SHA1,

    EAuthRCCm1,

    EAuthRCCm2,

    EAuthRCCm3

    };

class TSrtpCryptoParams

	{

	public: 

	TSrtpCryptoParams();

	TSRTPEncAlg iSrtpEncAlg; 

	TSRTPEncAlg iSrtcpEncAlg;                

	TSRTPAuthAlg iSrtpAuthAlg; 

	TSRTPAuthAlg iSrtcpAuthAlg; 

	TUint iSrtpAuthTagLen;

	TUint iSrtcpAuthTagLen;             

	TUint iSrtpKeyDervRate; //The key derivation rate

	TUint iSrtcpKeyDervRate;    

	TUint iPrefixLen;   

	TBool iSrtpReplayProtection;

	TBool iSrtcpReplayProtection;   

	TUint16 iROCTransRate;   

	TUint64 iMasterKeysLifeTime; //Set both for SRTP/SRTCP otherwise use default

	TInt iReplayWindowSizeHint; //Set both for SRTP/SRTCP otherwise use default

	TBool iIsRCCm3Sync;

	};

//IF any of the following param changes it will cause the caculation changes.

inline TSrtpCryptoParams::TSrtpCryptoParams() : 

	  	iSrtpEncAlg( EEncAES_CM ), //encoding algorithm

       	iSrtcpEncAlg( EEncAES_CM ), 

        iSrtpAuthAlg( EAuthHMAC_SHA1 ), // authentication algorithm

        iSrtcpAuthAlg(EAuthHMAC_SHA1 ), 

        iSrtpAuthTagLen(KSRTPAuthTagDefaultLength),

        iSrtcpAuthTagLen(KSRTPAuthTagDefaultLength),

        iSrtpKeyDervRate( KSRTPDefaultKeyDerivationRate ),

        iSrtcpKeyDervRate( KSRTPDefaultKeyDerivationRate ),

        iPrefixLen( KSRTPPrefixLength ), // prefix length	 must be 0

        iSrtpReplayProtection( ETrue ), // replay protection on/off

        iSrtcpReplayProtection( ETrue),

        iROCTransRate(KSRTPDefaultROCTransRate), // Integrity transform parameter

        iMasterKeysLifeTime (0),

        iReplayWindowSizeHint (KReplayWindowSize),

        iIsRCCm3Sync(EFalse) // using in RCCm3 only defined in RFC srtp-rcc04 Section 4	

	{

	};       

#endif // __SRTP_CRYPTOPARAMS_H__