/*

* Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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: 

* ** IMPORTANT ** PublishedPartner API's in this file are published to 3rd party developers via the 

* Symbian website. Changes to these API's should be treated as PublishedAll API changes and the Security TA should be consulted.

*

*/

/**

 @file

 @publishedPartner

 @released

*/

#ifndef __STREAMCIPHER_H__

#define __STREAMCIPHER_H__

#include "msymmetriccipher.h"

/**

*	Abstract interface class to be implemented by Stream Ciphers.

*/

class CStreamCipher : public CSymmetricCipher

{

public:	//	From CSymmetricCipher

	/**	

	*	Implemented by calling the DoProcess() pure virtual function, 

	*	to be implemented by subclasses.

	*

	*	@param aInput	Input text.

	*	@param aOutput	Text after processing.

	*/

	IMPORT_C virtual void ProcessFinalL(const TDesC8& aInput, TDes8& aOutput);

	/**	

	*	Implemented by calling the DoProcess() pure virtual function, 

	*	to be implemented by subclasses.

	*

	*	@param aInput	Input text.

	*	@param aOutput	Text after processing.

	*/

	IMPORT_C virtual void Process(const TDesC8& aInput, TDes8& aOutput);	

	/**

	*	Gets the block size in bytes (always = 1 for stream ciphers).

	*

	*	@return	Cipher block size (in bytes).

	*/

	IMPORT_C virtual TInt BlockSize(void) const;

	IMPORT_C virtual TInt MaxOutputLength(TInt aInputLength) const;

	IMPORT_C virtual TInt MaxFinalOutputLength(TInt aInputLength) const;

protected:

	/**	

	*	DoProcess() pure virtual function, 

	*	to be implemented by subclasses.

	*

	*	@param aData	On input, text to be processed; on return, processed text.

	*/

	IMPORT_C virtual void DoProcess(TDes8& aData) = 0;

};

#endif	//	__STREAMCIPHER_H__