/*+
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* Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).+
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* All rights reserved.+
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* This component and the accompanying materials are made available+
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* under the terms of the License "Eclipse Public License v1.0"+
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* which accompanies this distribution, and is available+
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".+
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*+
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* Initial Contributors:+
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* Nokia Corporation - initial contribution.+
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*+
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* Contributors:+
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*+
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* Description: +
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* ** IMPORTANT ** PublishedPartner API's in this file are published to 3rd party developers via the +
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* Symbian website. Changes to these API's should be treated as PublishedAll API changes and the Security TA should be consulted.+
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* Rijndael implementation+
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*+
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*/+
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+
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+
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/**+
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 @file +
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 @publishedPartner+
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 @released +
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*/+
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 +
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#ifndef __RIJNDAEL_H__+
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#define __RIJNDAEL_H__+
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+
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#include <blocktransformation.h>+
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+
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/**+
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* Abstract base class for Rijndael, implementing the parts of Rijndael common to both+
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* Rijndael encryption and decryption.+
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*+
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*/+
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class CRijndael : public CBlockTransformation+
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{+
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public:	//	From CBlockTransformation+
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	virtual void Reset(void);+
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	virtual TInt KeySize(void) const;+
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	/** The destructor frees all resources owned by the object, prior to its destruction. */+
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	IMPORT_C virtual ~CRijndael(void);+
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protected:+
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	/** Default constructor */+
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	IMPORT_C CRijndael(void);+
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	virtual void SetKey(const TDesC8& aKey);+
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	virtual void ConstructL(const TDesC8& aKey);+
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protected:+
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	/** +
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	 * The key schedule +
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	 *+
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	 * The maximum size is (((KAESMaxBlockSize/4)+6)+1)*4+
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	 */+
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	TUint32 iK[60];+
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	/** The number of rounds */+
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	TUint iRounds;+
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	/** +
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	 * The input key +
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	 *+
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	 * The key length (in bytes) must be one of the following:+
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	 * - KAESKeySize128 (=16)+
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	 * - KAESKeySize192 (=24)+
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	 * - KAESKeySize256 (=32).+
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	 */+
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	HBufC8* iKey;+
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private:+
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	CRijndael(const CRijndael&);+
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	const CRijndael& operator= (const CRijndael&);+
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};+
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+
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/**+
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* Concrete class for AES encryption.+
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*+
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*/+
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class CAESEncryptor : public CRijndael+
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{+
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public:	//	From CBlockTransformation+
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	/**+
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	* Creates an instance of this class.+
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	*+
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	* @param aKey	The key to be used for encryption. The key length must be either+
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	*				KAESKeySize128 (=16), KAESKeySize192 (=24) or KAESKeySize256 (=32) bytes.+
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	*+
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	* @leave KErrKeyNotWeakEnough	If the key size is larger than that allowed by the+
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	*								cipher strength restrictions of the crypto library.+
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	*								See TCrypto::IsSymmetricWeakEnoughL()+
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	*/+
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	IMPORT_C static CAESEncryptor* NewL(const TDesC8& aKey);+
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	+
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	/**+
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	* Creates an instance of this class and leaves it on the cleanup stack.+
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	*+
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	* @param aKey	The key to be used for encryption. The key length must be either+
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	*				KAESKeySize128 (=16), KAESKeySize192 (=24) or KAESKeySize256 (=32) bytes.+
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	*+
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	* @leave KErrKeyNotWeakEnough	If the key size is larger than that allowed by the+
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	*								cipher strength restrictions of the crypto library.+
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	*								See TCrypto::IsSymmetricWeakEnoughL()+
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	*/+
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	IMPORT_C static CAESEncryptor* NewLC(const TDesC8& aKey);+
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	virtual TInt BlockSize() const;+
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	virtual void Transform(TDes8& aBlock);+
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protected:+
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	/** @internalAll */+
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	CAESEncryptor(void);+
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private:+
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	CAESEncryptor(const CAESEncryptor&);+
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	const CAESEncryptor& operator= (const CAESEncryptor&);+
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};+
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+
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/**+
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* Concrete class for AES decryption.+
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*+
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*/+
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class CAESDecryptor : public CRijndael+
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{+
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public:	//	From CBlockTransformation+
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	/**+
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	* Creates an instance of this class.+
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	*+
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	* @param aKey	The key to be used for decryption. The key length must be either+
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	*				KAESKeySize128 (=16), KAESKeySize192 (=24) or KAESKeySize256 (=32) bytes.+
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	*+
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	* @leave KErrKeyNotWeakEnough	If the key size is larger than that allowed by the+
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	*								cipher strength restrictions of the crypto library. +
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	*								See TCrypto::IsSymmetricWeakEnoughL()+
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	*/+
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	IMPORT_C static CAESDecryptor* NewL(const TDesC8& aKey);+
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+
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	/**+
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	* Creates an instance of this class and leaves it on the cleanup stack.+
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	*+
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	* @param aKey	The key to be used for decryption. The key length must be either+
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	*				KAESKeySize128 (=16), KAESKeySize192 (=24) or KAESKeySize256 (=32) bytes.+
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	*+
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	* @leave KErrKeyNotWeakEnough	If the key size is larger than that allowed by the+
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	*								cipher strength restrictions of the crypto library.+
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	*								See TCrypto::IsSymmetricWeakEnoughL()+
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	*/+
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	IMPORT_C static CAESDecryptor* NewLC(const TDesC8& aKey);+
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	virtual TInt BlockSize() const;+
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	virtual void Transform(TDes8& aBlock);+
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protected:+
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	virtual void SetKey(const TDesC8& aKey);+
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	/** @internalAll */+
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	CAESDecryptor(void);+
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private:+
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	CAESDecryptor(const CAESDecryptor&);+
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	const CAESDecryptor& operator= (const CAESDecryptor&);+
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};+
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+
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+
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#endif	//	__RIJNDAEL_H__+
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