os/security/cryptoplugins/cryptospiplugins/source/softwarecrypto/desimpl.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	__DESIMPL_H__
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#define	__DESIMPL_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 DES 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(CDesImpl) : public CSymmetricBlockCipherImpl
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		{
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	public:
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		/**
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		Creates an instance of a DES (Data Encryption Standard) 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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		@return A pointer to a CDesImpl instance
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		*/
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		static CDesImpl* NewL(const CKey& aKey, 
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			TUid aCryptoMode, TUid aOperationMode, TUid aPadding);
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		/**
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		Creates an instance of a DES (Data Encryption Standard) 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 T 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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		@return A pointer to a CDesImpl instance
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		*/
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		static CDesImpl* NewLC(const CKey& aKey, 
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			TUid aCryptoMode,	TUid aOperationMode, TUid aPadding);
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		// From CSymmetricCipherImpl
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		TInt GetKeyStrength() const;
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		TBool IsValidKeyLength(TInt aKeyBytes) const;
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		TUid ImplementationUid() const;
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		const CExtendedCharacteristics* GetExtendedCharacteristicsL();
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		static CExtendedCharacteristics* CreateExtendedCharacteristicsL();
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		/// Destructor
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		~CDesImpl();		
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	protected:
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		/**
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		Constructor
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		@param aBlockBytes The block size in bytes (needed to allow
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		3DES implementation to inherit from this class)
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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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		CDesImpl(TUint8 aBlockBytes, TUid aOperationMode, TUid aCryptoMode, TUid aPaddingMode);
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		/**	
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		Second phase of construction
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		@param aKey The key object
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		*/
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		void ConstructL(const CKey& aKey);	
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		// These protected functions are re-used by 3DES
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		/**
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		Transforms a block of data
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		@param l The left half of the block to transform
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		@param r The right half of the block to transform
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		@param aKeySchedule The keyschedule to use for the transformation
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		*/
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		void DoTransform(TUint32& l, TUint32& r, const TUint32* aKeySchedule);
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		/**
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		Setup the key schedule for encryption
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		@param aKey The input key
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		@param aKeySchedule A pointer to the key schedule buffer
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		*/
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		void SetEncryptKeySchedule(const TDesC8& aKey, TUint32* aKeySchedule);
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		/**
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		Setup the key schedule for decryption
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		@param aKey The input key
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		@param aKeySchedule A pointer to the key schedule buffer		
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		*/
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		void SetDecryptKeySchedule(const TDesC8& aKey, TUint32* aKeySchedule);
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		static const TUint8 KDesBlockBytes = 8;
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		static const TUint8 KDesKeyBytes = 8;						
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	private:														
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		/**
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		Creates the key schedule iK from CBlockTransformationImpl::iKey.
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		This should be called from ConstructL and Reset
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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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		/// Size of the key schedule in words
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		static const TUint KKeyScheduleSize = 32;
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		/// the key schedule
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		TUint32 iK[KKeyScheduleSize];
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		};
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	}
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#endif // __DESIMPL_H__