/*

* 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 __RSAIMPL_H__

#define __RSAIMPL_H__

/**

@file 

@internalComponent

@released

*/

#include <e32base.h>

#include <e32cmn.h>

#include "keys.h"

#include "asymmetriccipherimpl.h"

/**

 * Implementation of RSA encryption as described in PKCS#1 v1.5.

 */

namespace SoftwareCrypto

	{

	using namespace CryptoSpi;

	NONSHARABLE_CLASS(CRSAImpl) : public CAsymmetricCipherImpl

		{

	public:

		/**

		Creates an instance of an RSA asymmetric cipher plug-in.

		@param aKey The key

		@param aCryptoMode Whether to encrypt or decrypt

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

		@return A pointer to a CRSAImpl instance

		*/

		static CRSAImpl* NewL(TUid aImplementationUid, const CKey& aKey,

			TUid aCryptoMode, TUid aPadding);

		/**

		Creates an instance of an RSA asymmetric 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 aPadding The padding scheme to use None, SSLv3, PKCS#7

		@return A pointer to a CRSAImpl instance

		*/

		static CRSAImpl* NewLC(TUid aImplementationUid, const CKey& aKey,

			TUid aCryptoMode, TUid aPadding);

		// Override CAsymmetricCipherImpl virtual functions

		TUid ImplementationUid() const;

		TBool IsValidKeyLengthL(TInt aKeyBytes) const;

		TInt GetMaximumInputLengthL() const;

		TInt GetMaximumOutputLengthL() const;

		void ProcessL(const TDesC8& aInput, TDes8& aOutput);

		// End of CAsymmetricCipherImpl

		const CExtendedCharacteristics* GetExtendedCharacteristicsL();

		static CExtendedCharacteristics* CreateExtendedCharacteristicsL();

		// Destructor

		~CRSAImpl();

	private:

		/**

		Constructor

		@param aCryptoMode Whether to encrypt or decrypt

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

		*/

		CRSAImpl(TUid aImplementationUid, TUid aCryptoMode, TUid aPaddingMode);

		/// second phase of construction

		void ConstructL(const CKey& aKey);

		/// for internal usage, called from ProcessL

		void EncryptL(const TDesC8& aInput, TDes8& aOutput) const;

		void DecryptL(const TDesC8& aInput, TDes8& aOutput) const;

	private:

		TUid iImplementationUid; 

		};

	}

#endif // __RSAIMPL_H__