/*

 * 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: 

 *

 */

 #ifndef	__RIJNDAELIMPL_H__

 #define	__RIJNDAELIMPL_H__

 /**

 @file 

 @internalComponent

 @released

 */

 #include <e32base.h>

 #include <e32cmn.h>

 #include "keys.h"

 #include "symmetriccipherimpl.h"

 /**

 Plug-in class for AES (Rijndael) block cipher

 */

 namespace SoftwareCrypto

 	{

 	using namespace CryptoSpi;

 	NONSHARABLE_CLASS(CRijndaelImpl) : public CSymmetricBlockCipherImpl

 		{

 	public:

 		/**

 		Creates an instance of an AES (Rijndael) symmetric cipher plug-in.

 		@param aKey The key

 		@param aCryptoMode Whether to encrypt or decrypt

 		@param aOperationMode The block cipher mode ECB, CBC, CTR etc

 		@param aPadding The padding scheme to use None, SSLv3, PKCS#7

 		@return A pointer to a CRijndaelImpl instance

 		*/

 		static CRijndaelImpl* NewL(const CKey& aKey, 

 			TUid aCryptoMode, TUid aOperationMode, TUid aPadding);

 		/**

 		Creates an instance of an AES (Rijndael) symmetric cipher plug-in.

 		A pointer to the plug-in instance is placed on the cleanup stack.

 		@param aKey The key

 		@param aCryptoMode Whether to encrypt or decrypt

 		@param aOperationMode The block cipher mode ECB, CBC, CTR etc

 		@param aPadding The padding scheme to use None, SSLv3, PKCS#7

 		@return A pointer to a CRijndaelImpl instance

 		*/

 		static CRijndaelImpl* NewLC(const CKey& aKey, 

 			TUid aCryptoMode,	TUid aOperationMode, TUid aPadding);

 		// From CSymmetricCipherImpl

 		TBool IsValidKeyLength(TInt aKeyBytes) const;

 		TUid ImplementationUid() const;

 		const CExtendedCharacteristics* GetExtendedCharacteristicsL();

 		static CExtendedCharacteristics* CreateExtendedCharacteristicsL();

 		/// Destructor

 		~CRijndaelImpl();

 	private:

 		/**

 		Constructor

 		@param aOperationMode The mode of operation e.g. CBC

 		@param aCryptoMode Whether to encrypt or decrypt

 		@param aPaddingMode The padding mode to use. None, SSL, PKCS#7

 		*/

 		CRijndaelImpl(TUid aOperationMode, TUid aCryptoMode, TUid aPaddingMode);

 		///	second phase of construction	

 		void ConstructL(const CKey& aKey);

 		/**

 		Creates the key schedule iK from CBlockTransformationImpl::iKey.

 		This should be called from ConstructL and Reset

 		*/

 		void SetKeySchedule();

 		/**

 		Setup the key schedule for encryption

 		@param aKey The input key

 		@param aKeySchedule The pointer to the key schedule buffer

 		*/

 		void SetEncryptKeySchedule(const TDesC8& aKey, TUint32* aKeySchedule);

 		/**

 		Setup the key schedule for decryption

 		@param aKey The input key

 		@param aKeySchedule The pointer to the key schedule buffer		

 		*/

 		void SetDecryptKeySchedule(const TDesC8& aKey, TUint32* aKeySchedule);

 		// From CSymmetricBlockCipherImpl

 		void TransformEncrypt(TUint8* aBuffer, TUint aNumBlocks);

 		void TransformDecrypt(TUint8* aBuffer, TUint aNumBlocks);

 	private:

 		/** 

 		The key-schedule size in WORDS

 	 	The maximum size is (((KAESMaxBlockSize/4)+6)+1)*4

 	 	*/

 	 	static const TUint32 KKeyScheduleSize = 60;

 	 	/// the key schedule

 		TUint32 iK[KKeyScheduleSize];

 		TInt iRounds;

 		};

 	}

 #endif //__RIJNDAELIMPL_H__