/*

* Copyright (c) 2006 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:    Class is used for configuring mcc srtp crypto params

*

*/

#ifndef MMCCSRTPCRYPTOPARAMS_H

#define MMCCSRTPCRYPTOPARAMS_H

// INCLUDES

#include <e32base.h>

// CONSTANTS

// The default bit length of the HMAC-SHA1 authentication tag

const TUint KMccSRTPAuthTagDefaultLength = 80;

// default SRTP key derivation rate: 0

const TUint16 KMccSRTPDefaultKeyDerivationRate = 0x00;

// The default length of the SRTP prefix

const TUint KMccSRTPPrefixLength = 0;

const TInt KMccReplayWindowSize = 64;

// default SRTP ROC Transmission rate: 1

const TUint16 KMccSRTPDefaultROCTransRate = 0x01;

// The 80 bit length of the HMAC-SHA1 authentication tag (n_tag)

const TUint KMccSRTPAuthTagLength80 = 80;

// The 32 bit length of the HMAC-SHA1 authentication tag (n_tag)

// Also recommending in RCCm3 as 4 octects

const TUint KMccSRTPAuthTagLength32 = 32;

//recommending to use in RCCm1 or RCCm2 as 14 octets

const TUint KMccSRTPAuthTagLength112 = 112;

/**

 * Encyption algorithms.

 */

enum TMccSRTPEncAlg

    {

    ESrtpNullAlg = 0,

    ESrtpEncAES_CM

    };

/**

 * Authentication algorithms.

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

 */

enum TMccSRTPAuthAlg

    {

    ESrtpAuthNull = 0,

    ESrtpAuthHMAC_SHA1,

    ESrtpAuthRCCm1,

    ESrtpAuthRCCm2,

    ESrtpAuthRCCm3

    };

/**

 * The TMccSrtpCryptoParams captures the MCC SRTP crypto params

 * into one class

 *

 * @lib N/A

 * @since Series 60 3.2

 */    

class TMccSrtpCryptoParams

	{

public:

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

      	iSrtpEncAlg( ESrtpEncAES_CM ), 

       	iSrtcpEncAlg( ESrtpEncAES_CM ), 

        iSrtpAuthAlg( ESrtpAuthHMAC_SHA1 ), 

        iSrtcpAuthAlg(ESrtpAuthHMAC_SHA1 ), 

        iSrtpAuthTagLen( KMccSRTPAuthTagDefaultLength ),

        iSrtcpAuthTagLen(KMccSRTPAuthTagDefaultLength ),

        iSrtpKeyDervRate( KMccSRTPDefaultKeyDerivationRate ),

        iSrtcpKeyDervRate( KMccSRTPDefaultKeyDerivationRate ),

        iPrefixLen( KMccSRTPPrefixLength ), 

        iSrtpReplayProtection( ETrue ), 

        iSrtcpReplayProtection( ETrue),

        iROCTransRate( KMccSRTPDefaultROCTransRate ), 

        iMasterKeysLifeTime ( 0 ),

        iReplayWindowSizeHint ( KMccReplayWindowSize ),

        iIsRCCm3Sync( EFalse )                 

    	{

    	};

    TMccSRTPEncAlg iSrtpEncAlg;     //encoding algorithm

    TMccSRTPEncAlg iSrtcpEncAlg;                

    TMccSRTPAuthAlg iSrtpAuthAlg;   // authentication algorithm

    TMccSRTPAuthAlg iSrtcpAuthAlg; 

    TUint iSrtpAuthTagLen;

    TUint iSrtcpAuthTagLen;             

    TUint iSrtpKeyDervRate;         //The key derivation rate

    TUint iSrtcpKeyDervRate;    

    TUint iPrefixLen;               // prefix length	 must be 0

    TBool iSrtpReplayProtection;    // replay protection on/off

    TBool iSrtcpReplayProtection;   

    TUint16 iROCTransRate;          // Integrity transform parameter

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

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

    TBool iIsRCCm3Sync;             // using in RCCm3 only defined in RFC srtp-rcc04 Section 4	

	};

typedef TPckgBuf<TMccSrtpCryptoParams> TMccSrtpCryptoParamsPckg;

#endif /* MMCCSRTPCRYPTOPARAMS_H */

// End of File