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 	NONSHARABLE_CLASS(C3DesImpl) : public CDesImpl

    39 		{

    40 	public:

    41 	

    42 		/**

    43 		Creates an instance of a 3DES (Data Encryption Standard) symmetric cipher plug-in.

    44 		@param aKey The key

    45 		@param aCryptoMode Whether to encrypt or decrypt

    46 		@param aOperationMode The block cipher mode ECB, CBC, CTR etc

    47 		@param aPadding The padding scheme to use None, SSLv3, PKCS#7

    48 		@return A pointer to a C3DesImpl instance

    49 		*/

    50 		static C3DesImpl* NewL(const CryptoSpi::CKey& aKey, 

    51 			TUid aCryptoMode, TUid aOperationMode, TUid aPadding);

    52 

    53 		/**

    54 		Creates an instance of a 3DES (Data Encryption Standard) symmetric cipher plug-in.

    55 		A pointer to the plug-in instance is placed on the cleanup stack.

    56 		@param aKey The key

    57 		@param aCryptoMode Whether to encrypt or decrypt

    58 		@param aOperationMode The block cipher mode ECB, CBC, CTR etc

    59 		@param aPadding The padding scheme to use None, SSLv3, PKCS#7

    60 		@return A pointer to a C3DesImpl instance

    61 		*/

    62 		static C3DesImpl* NewLC(const CryptoSpi::CKey& aKey, 

    63 			TUid aCryptoMode, TUid aOperationMode, TUid aPadding);

    64 		

    65 		// From CSymmetricCipherImpl

    66 		TBool IsValidKeyLength(TInt aKeyBytes) const;

    67 		TInt GetKeyStrength() const;

    68 		TUid ImplementationUid() const;

    69 				

    70 		/// 3Destructor

    71 		~C3DesImpl();

    72 

    73 	private:

    74 		/**

    75 		Constructor

    76 		@param aOperationMode The mode of operation e.g. CBC

    77 		@param aCryptoMode Whether to encrypt or decrypt

    78 		@param aPaddingMode The padding mode to use. None, SSL, PKCS#7

    79 		*/

    80 		C3DesImpl(TUid aOperationMode, TUid aCryptoMode, TUid aPaddingMode);

    81 			

    82 		///	second phase of construction	

    83 		void ConstructL(const CryptoSpi::CKey& aKey);						

    84 

    85 		/**

    86 		Creates the key schedules iK1, iK2, iK3 from CBlockTransformationImpl::iKey.

    87 		This should be called from ConstructL and Reset

    88 		*/

    89 		void SetKeySchedule();

    90 

    91 		// From CSymmetricBlockCipherImpl

    92 		void TransformEncrypt(TUint8* aBuffer, TUint aNumBlocks);

    93 		void TransformDecrypt(TUint8* aBuffer, TUint aNumBlocks);

    94 		

    95 	private:

    96 		/// Size of the key schedule in words

    97 		static const TUint KKeyScheduleSize = 32;

    98 		

    99 		/// the key schedules

   100 		TUint32 iK1[KKeyScheduleSize];

   101 		TUint32 iK2[KKeyScheduleSize];

   102 		TUint32 iK3[KKeyScheduleSize];

   103 		

   104 		static const TUint8 K3DesBlockBytes = 8;

   105 		static const TUint8 K3DesKeyBytes = 24;

   106 		};

   107 	}

   108 

   109 #endif // __3DESIMPL_H__