/*

 * 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;

 	/**

 	 * This is the maximum block size currently supported by HMAC implementation.

 	 */  

 	const TInt KMaxBlockSize = 128;		

 	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);

 		void InitBlockSizeL();

 	private:

 		TUid iImplementationUid;

 		MSoftwareHash* iDigest;

 		TBuf8<KMaxBlockSize> iInnerPad;

 		TBuf8<KMaxBlockSize> iOuterPad;

 		TBuf8<KMaxBlockSize> iInnerPadCopy;

 		TBuf8<KMaxBlockSize> iOuterPadCopy;

 		TInt iBlockSize;

 		};

 	}

 #endif // __CRYPTOAPI_SOFTWAREHMACIMPL_H__