os/security/cryptoplugins/cryptospiplugins/source/softwarecrypto/3desimpl.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.
     1 /*
     2 * Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).
     3 * All rights reserved.
     4 * This component and the accompanying materials are made available
     5 * under the terms of the License "Eclipse Public License v1.0"
     6 * which accompanies this distribution, and is available
     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".
     8 *
     9 * Initial Contributors:
    10 * Nokia Corporation - initial contribution.
    11 *
    12 * Contributors:
    13 *
    14 * Description: 
    15 *
    16 */
    17 
    18 
    19 #ifndef	__3DESIMPL_H__
    20 #define	__3DESIMPL_H__
    21 
    22 /**
    23 @file 
    24 @internalComponent
    25 @released
    26 */
    27 
    28 #include <e32base.h>
    29 #include <e32cmn.h>
    30 #include "keys.h"
    31 #include "desimpl.h"
    32 
    33 /**
    34 Plug-in class for 3DES block cipher
    35 */
    36 namespace SoftwareCrypto
    37 	{
    38 	using namespace CryptoSpi;
    39 	
    40 	NONSHARABLE_CLASS(C3DesImpl) : public CDesImpl
    41 		{
    42 	public:
    43 		/**
    44 		Creates an instance of a 3DES (Data Encryption Standard) symmetric cipher plug-in.
    45 		@param aKey The key
    46 		@param aCryptoMode Whether to encrypt or decrypt
    47 		@param aOperationMode The block cipher mode ECB, CBC, CTR etc
    48 		@param aPadding The padding scheme to use None, SSLv3, PKCS#7
    49 		@return A pointer to a C3DesImpl instance
    50 		*/
    51 		static C3DesImpl* NewL(const CKey& aKey, 
    52 			TUid aCryptoMode, TUid aOperationMode, TUid aPadding);
    53 
    54 		/**
    55 		Creates an instance of a 3DES (Data Encryption Standard) symmetric cipher plug-in.
    56 		A pointer to the plug-in instance is placed on the cleanup stack.
    57 		@param aKey The key
    58 		@param aCryptoMode Whether to encrypt or decrypt
    59 		@param aOperationMode The block cipher mode ECB, CBC, CTR etc
    60 		@param aPadding The padding scheme to use None, SSLv3, PKCS#7
    61 		@return A pointer to a C3DesImpl instance
    62 		*/
    63 		static C3DesImpl* NewLC(const CKey& aKey, 
    64 			TUid aCryptoMode, TUid aOperationMode, TUid aPadding);
    65 		
    66 		// From CSymmetricCipherImpl
    67 		TBool IsValidKeyLength(TInt aKeyBytes) const;
    68 		TInt GetKeyStrength() const;
    69 		TUid ImplementationUid() const;
    70 		const CExtendedCharacteristics* GetExtendedCharacteristicsL();
    71 		
    72 		static CExtendedCharacteristics* CreateExtendedCharacteristicsL();
    73 				
    74 		/// 3Destructor
    75 		~C3DesImpl();
    76 
    77 	private:
    78 		/**
    79 		Constructor
    80 		@param aOperationMode The mode of operation e.g. CBC
    81 		@param aCryptoMode Whether to encrypt or decrypt
    82 		@param aPaddingMode The padding mode to use. None, SSL, PKCS#7
    83 		*/
    84 		C3DesImpl(TUid aOperationMode, TUid aCryptoMode, TUid aPaddingMode);
    85 			
    86 		///	second phase of construction	
    87 		void ConstructL(const CKey& aKey);						
    88 
    89 		/**
    90 		Creates the key schedules iK1, iK2, iK3 from CBlockTransformationImpl::iKey.
    91 		This should be called from ConstructL and Reset
    92 		*/
    93 		void SetKeySchedule();
    94 
    95 		// From CSymmetricBlockCipherImpl
    96 		void TransformEncrypt(TUint8* aBuffer, TUint aNumBlocks);
    97 		void TransformDecrypt(TUint8* aBuffer, TUint aNumBlocks);
    98 		
    99 	private:
   100 		/// Size of the key schedule in words
   101 		static const TUint KKeyScheduleSize = 32;
   102 		
   103 		/// the key schedules
   104 		TUint32 iK1[KKeyScheduleSize];
   105 		TUint32 iK2[KKeyScheduleSize];
   106 		TUint32 iK3[KKeyScheduleSize];
   107 		
   108 		static const TUint8 K3DesBlockBytes = 8;
   109 		static const TUint8 K3DesKeyBytes = 24;
   110 		};
   111 	}
   112 
   113 #endif // __3DESIMPL_H__