os/security/cryptoplugins/cryptospiplugins/source/softwarecrypto/rc2impl.h
author sl@SLION-WIN7.fritz.box
Fri, 15 Jun 2012 03:10:57 +0200
changeset 0 bde4ae8d615e
permissions -rw-r--r--
First public contribution.
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/*
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* Copyright (c) 2006-2009 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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*
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*/
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#ifndef	__RC2_H__
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#define	__RC2_H__
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/**
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@file 
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@internalComponent
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@released
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*/
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#include <e32base.h>
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#include <e32cmn.h>
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#include "keys.h"
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#include "symmetriccipherimpl.h"
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/**
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Plug-in class for RC2 block cipher
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*/
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namespace SoftwareCrypto
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	{
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	using namespace CryptoSpi;
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	NONSHARABLE_CLASS(CRc2Impl) : public CSymmetricBlockCipherImpl
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		{
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	public:
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		/**
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		Creates an instance of an RC2 symmetric cipher plug-in.
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		@param aKey The key
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		@param aCryptoMode Whether to encrypt or decrypt
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		@param aOperationMode The block cipher mode ECB, CBC, CTR etc
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		@param aPadding The padding scheme to use None, SSLv3, PKCS#7
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		@param aEffectiveKeyLenBits The effective key length in bits
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		@return A pointer to a CRc2Impl instance
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		*/
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		static CRc2Impl* NewL(const CKey& aKey, 
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			TUid aCryptoMode, TUid aOperationMode, TUid aPadding, TInt aEffectiveKeyLenBits);
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		/**
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		Creates an instance of an RC2 symmetric cipher plug-in.
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		A pointer to the plug-in instance is placed on the cleanup stack.
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		@param aKey The key
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		@param aCryptoMode Whether to encrypt or decrypt
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		@param aOperationMode The block cipher mode ECB, CBC, CTR etc
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		@param aPadding The padding scheme to use None, SSLv3, PKCS#7
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		@param aEffectiveKeyLenBits The effective key length in bits
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		@return A pointer to a CRc2Impl instance
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		*/
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		static CRc2Impl* NewLC(const CKey& aKey, 
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			TUid aCryptoMode, TUid aOperationMode, TUid aPadding, TInt aEffectiveKeyLenBits);
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		// From CSymmetricCipherImpl
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		TBool IsValidKeyLength(TInt aKeyBytes) const;
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		TUid ImplementationUid() const;
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		TInt GetKeyStrength() const;
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		const CExtendedCharacteristics* GetExtendedCharacteristicsL();
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		static CExtendedCharacteristics* CreateExtendedCharacteristicsL();
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		/// Destructor
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		~CRc2Impl();
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		/** SSL Effective Key Length Compatibility - for compatibility with SSL */
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		static const TUint KDefaultEffectiveKeyLenBits = 1024;
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	private:
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		/**
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		Constructor
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		@param aOperationMode The mode of operation e.g. CBC
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		@param aCryptoMode Whether to encrypt or decrypt
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		@param aPaddingMode The padding mode to use. None, SSL, PKCS#7
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		*/
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		CRc2Impl(TUid aOperationMode, TUid aCryptoMode, TUid aPaddingMode);
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		///	second phase of construction	
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		void ConstructL(const CKey& aKey, TInt aEffectiveKeyLenBits);
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		/**
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		Expands the key (iKey) to iEffectiveKeyLenBits and stores the result in iK
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		*/
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		void SetKeySchedule();
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		// From CSymmetricBlockCipherImpl
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		void TransformEncrypt(TUint8* aBuffer, TUint aNumBlocks);
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		void TransformDecrypt(TUint8* aBuffer, TUint aNumBlocks);		
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	private:		
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		static const TUint8 KRc2BlockBytes = 8;
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		static const TInt KRc2MaxKeySizeBytes = 128;	
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		static const TInt KRc2ExpandedKeyLen = 64;
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		/**
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	 	 The expanded key buffer.
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		 Each iK[i] is a 16-bit word.
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	 	 */
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		TUint16 iK[KRc2ExpandedKeyLen];	//	128 bytes		
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		/** The effective key length in bits */
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		TInt iEffectiveKeyLenBits;	
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		};
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	}
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#endif //__RC2_H__