--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cryptoplugins/cryptospiplugins/source/softwarecrypto/desimpl.h	Fri Nov 06 13:21:00 2009 +0200
@@ -0,0 +1,140 @@
+/*
+* 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	__DESIMPL_H__
+#define	__DESIMPL_H__
+
+/**
+@file 
+@internalComponent
+@released
+*/
+
+#include <e32base.h>
+#include <e32cmn.h>
+#include "keys.h"
+#include "symmetriccipherimpl.h"
+
+/**
+Plug-in class for DES block cipher
+*/
+namespace SoftwareCrypto
+	{
+	using namespace CryptoSpi;
+	
+	NONSHARABLE_CLASS(CDesImpl) : public CSymmetricBlockCipherImpl
+		{
+	public:
+		/**
+		Creates an instance of a DES (Data Encryption Standard) symmetric cipher plug-in.
+		@param aKey The key
+		@param aCryptoMode whether to encrypt or decrypt
+		@param aOperationMode The block cipher mode ECB, CBC, CTR etc
+		@param aPadding The padding scheme to use None, SSLv3, PKCS#7
+		@return A pointer to a CDesImpl instance
+		*/
+		static CDesImpl* NewL(const CKey& aKey, 
+			TUid aCryptoMode, TUid aOperationMode, TUid aPadding);
+
+		/**
+		Creates an instance of a DES (Data Encryption Standard) symmetric 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 aOperationMode T block cipher mode ECB, CBC, CTR etc
+		@param aPadding The padding scheme to use None, SSLv3, PKCS#7
+		@return A pointer to a CDesImpl instance
+		*/
+		static CDesImpl* NewLC(const CKey& aKey, 
+			TUid aCryptoMode,	TUid aOperationMode, TUid aPadding);
+		
+		// From CSymmetricCipherImpl
+		TInt GetKeyStrength() const;
+		TBool IsValidKeyLength(TInt aKeyBytes) const;
+		TUid ImplementationUid() const;
+		const CExtendedCharacteristics* GetExtendedCharacteristicsL();
+		
+		static CExtendedCharacteristics* CreateExtendedCharacteristicsL();
+				
+		/// Destructor
+		~CDesImpl();		
+	protected:
+		/**
+		Constructor
+		@param aBlockBytes The block size in bytes (needed to allow
+		3DES implementation to inherit from this class)
+		@param aOperationMode The mode of operation e.g. CBC
+		@param aCryptoMode Whether to encrypt or decrypt
+		@param aPaddingMode The padding mode to use. None, SSL, PKCS#7
+		*/
+		CDesImpl(TUint8 aBlockBytes, TUid aOperationMode, TUid aCryptoMode, TUid aPaddingMode);
+		
+		/**	
+		Second phase of construction
+		@param aKey The key object
+		*/
+		void ConstructL(const CKey& aKey);	
+			
+		// These protected functions are re-used by 3DES
+		/**
+		Transforms a block of data
+		@param l The left half of the block to transform
+		@param r The right half of the block to transform
+		@param aKeySchedule The keyschedule to use for the transformation
+		*/
+		void DoTransform(TUint32& l, TUint32& r, const TUint32* aKeySchedule);
+		
+		/**
+		Setup the key schedule for encryption
+		@param aKey The input key
+		@param aKeySchedule A pointer to the key schedule buffer
+		*/
+		void SetEncryptKeySchedule(const TDesC8& aKey, TUint32* aKeySchedule);
+		
+		/**
+		Setup the key schedule for decryption
+		@param aKey The input key
+		@param aKeySchedule A pointer to the key schedule buffer		
+		*/
+		void SetDecryptKeySchedule(const TDesC8& aKey, TUint32* aKeySchedule);
+		
+		static const TUint8 KDesBlockBytes = 8;
+		static const TUint8 KDesKeyBytes = 8;						
+
+	private:														
+
+		/**
+		Creates the key schedule iK from CBlockTransformationImpl::iKey.
+		This should be called from ConstructL and Reset
+		*/
+		void SetKeySchedule();			
+
+		// From CSymmetricBlockCipherImpl
+		void TransformEncrypt(TUint8* aBuffer, TUint aNumBlocks);
+		void TransformDecrypt(TUint8* aBuffer, TUint aNumBlocks);
+					
+	private:
+		/// Size of the key schedule in words
+		static const TUint KKeyScheduleSize = 32;
+		
+		/// the key schedule
+		TUint32 iK[KKeyScheduleSize];
+		};
+	}
+
+#endif // __DESIMPL_H__