crypto/weakcryptospi/inc/rijndael.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 10 Sep 2009 14:01:51 +0300
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/*
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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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 @file 
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 @publishedPartner
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 @released 
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*/
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#ifndef __RIJNDAEL_H__
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#define __RIJNDAEL_H__
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#include <blocktransformation.h>
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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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* 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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	* 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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* 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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	* 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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#endif	//	__RIJNDAEL_H__