/*

* 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:    Provides class for AES CM 128 bit encryption/decryption.

*

*/

#ifndef __SRTP_CIPHER_AESCM128_H__

#define __SRTP_CIPHER_AESCM128_H__

#include "msrtpcipher.h"

//FORWARD declarations

class CSrtpAESCTRCrypto;

class CSRTPCipherAESCM128: public CBase, public MSRTPCipher

    {

    public:

        /**

        * Constructor.

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

        */

	    static CSRTPCipherAESCM128* NewL();

        /**

        * Constructor.

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

        */

	    static CSRTPCipherAESCM128* NewLC();

        /**

        * Destructor.

        */

	    ~CSRTPCipherAESCM128();

        /**

        * Inherited from MSRTPCipher.

        * This function is called by SRTP for encryption/decryption with AESCM-128 

        * Produces key stream and performs an XOR operation for the plain text

        * @param aKey  Input key.

        * @param aIV  Integer Value (IV).

        * @param aSrc source data which will be transformed.

	    * Returns HBufC8* decrypted/encrypted source        

        */

        HBufC8* TransformL(const TDesC8& aKey, 

                                const TDesC8& aIV, 

                                const TDesC8& aSrc );

    private:         // Data        

	    CSrtpAESCTRCrypto* iCipher;	    

    private:         // methods

        /**

        * Default constructor.

        */

        CSRTPCipherAESCM128();  

        void ConstructL();  

    };

#endif // __SRTP_CIPHER_AESCM128_H__