/*

* 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 an abstract class for SRTP

*                  cipher operation (encryption/decryption)

*

*/

#ifndef __MSRTP_CIPHER_H__

#define __MSRTP_CIPHER_H__

#include <e32base.h>

class MSRTPCipher

    {

    public:

        /**

        * This function is called by SRTP for 

        * encryption/decryption cipher operation 

        * regardless of the algorithm, the default is 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        

        */

        virtual HBufC8* TransformL(const TDesC8& aKey, 

                                const TDesC8& aIV, 

                                const TDesC8& aSrc ) = 0;

        virtual ~MSRTPCipher() { };

    };

#endif // __MSRTP_CIPHER_H__