/*

* Copyright (c) 2006-2009 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: 

* Software hash base definition

*

*/

/**

 @file

 @internalComponent

 @released

*/

#ifndef __CRYPTOAPI_SOFTWAREHASHBASE_H__

#define __CRYPTOAPI_SOFTWAREHASHBASE_H__

#include <cryptospi/hashplugin.h>

#include "keys.h"

namespace SoftwareCrypto

	{

	using namespace CryptoSpi;

	/**

	Interfaces for Software Hash

	*/

	class MSoftwareHash : public MHash

		{

	public:

		/**

		Restores the internal state of the message digest

		to a previously stored state.

		*/

		virtual void RestoreState() = 0;

		/**

		Stores the internal state of the message digest.

		*/

		virtual void StoreState() = 0;

		};

	/**

	Proxy class Software Hash and Hmac implementation

	*/

	NONSHARABLE_CLASS(CSoftwareHash) : public MHash, public CBase

		{

	public:

		//

		//NewL & NewLC

		//

		static CSoftwareHash* NewL(TUid aAlgorithm, TUid aOperationMode, const CKey* aKey);

		static CSoftwareHash* NewLC(TUid aAlgorithm, TUid aOperationMode, const CKey* aKey);

		static CSoftwareHash* NewL(TUid aAlgorithm);

		//

		// Destructor

		//

		~CSoftwareHash();

		//

		//From MPlugin

		//

		void Reset();

		void Close();		

		void GetCharacteristicsL(const TCharacteristics*& aPluginCharacteristics);		

		const CExtendedCharacteristics* GetExtendedCharacteristicsL();

		TAny* GetExtension(TUid aExtensionId);

		//

		//From MHash

		//

	    TPtrC8 Hash(const TDesC8& aMessage);

	    void Update(const TDesC8& aMessage);

		TPtrC8 Final(const TDesC8& aMessage);

		MHash* ReplicateL();		

		MHash* CopyL();

		void SetKeyL(const CKey& aKey);			

		void SetOperationModeL(TUid aOperationMode);

	private:

		//

		//Constructor

		// 

		CSoftwareHash();

		void ConstructL(TUid aAlgorithm, TUid aOperationMode, const CKey* aKey);

		//

		//get the active implementation

		//

		MSoftwareHash* Impl();

	private:

		/**

		The Key for HMAC mode operation

		*/

		CKey* iKey;

		/**

		The Uid for the operation mode

		*/

		TUid iOperationMode;

		/**

		The hash implementation

		*/

		MSoftwareHash* iHashImpl;

		/**

		The Hmac implementation

		*/

		MSoftwareHash* iHmacImpl;

		};

	GLDEF_C inline TUint CMD_R(TUint a,TUint s)

		{

		return (a<<s) | (a>>(32-s));

		}

	}

#endif // __CRYPTOAPI_SOFTWAREHASHBASE_H__