/*

* 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: 

* hmac implementation

*

*/

/**

 @file

 @internalComponent

 @released

*/

#ifndef __CRYPTOAPI_SOFTWAREHMACIMPL_H__

#define __CRYPTOAPI_SOFTWAREHMACIMPL_H__

#include "softwarehashbase.h"

#include "keys.h"

namespace SoftwareCrypto

	{

	using namespace CryptoSpi;

	const TInt KHMacPad = 64;		

	NONSHARABLE_CLASS(CHMacImpl) : public CBase, public MSoftwareHash

		{		

	public:

		//NewL & NewLC

		static CHMacImpl* NewL(MSoftwareHash* aHash);

		static CHMacImpl* NewLC(MSoftwareHash* aHash);

		static CHMacImpl* NewL(const CKey& aKey, MSoftwareHash* aHash);

		static CHMacImpl* NewLC(const CKey& aKey, MSoftwareHash* aHash);

		//From MPlugin

		void Reset();

		void Close();		

		void GetCharacteristicsL(const TCharacteristics*& aPluginCharacteristics);		

		const CExtendedCharacteristics* GetExtendedCharacteristicsL();

		TAny* GetExtension(TUid aExtensionId);

		//From MHmac

	    TPtrC8 Hash(const TDesC8& aMessage);

	    void Update(const TDesC8& aMessage);

		TPtrC8 Final(const TDesC8& aMessage);

		void SetKeyL(const CKey& aKey);

		void SetOperationModeL(TUid aOperationMode);

		MHash* ReplicateL();		

		MHash* CopyL();

	private:

		//Constructors

		CHMacImpl();

		CHMacImpl(const CHMacImpl& aHMacImpl);

		//Destructor

		~CHMacImpl();

		void RestoreState();

		void StoreState();

		void ConstructL(const CKey& aKey, MSoftwareHash* aHash);

		void ConstructL(MSoftwareHash* aHash);

		void Initialise(const TDesC8& aKey);

	private:

		TUid iImplementationUid;

		MSoftwareHash* iDigest;

		TBuf8<KHMacPad> iInnerPad;

		TBuf8<KHMacPad> iOuterPad;

		TBuf8<KHMacPad> iInnerPadCopy;

		TBuf8<KHMacPad> iOuterPadCopy;

		};

	}

#endif // __CRYPTOAPI_SOFTWAREHMACIMPL_H__