author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 25 May 2010 14:37:45 +0300 | |
branch | RCL_3 |
changeset 63 | 07c4e3a0535d |
parent 8 | 35751d3474b7 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007-2009 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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|
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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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#ifndef __SYMMETRICCIPHERIMPL_H__ |
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#define __SYMMETRICCIPHERIMPL_H__ |
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#include <e32base.h> |
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#include <e32cmn.h> |
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#include <cryptospi/cryptospidef.h> |
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#include <padding.h> |
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#include "symmetriccipherplugin.h" |
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#ifdef __MARM__ |
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#define __NOTSHARED __declspec(notshared) |
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#else |
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#define __NOTSHARED |
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#endif |
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/** The maximum block size supported (in bytes) */ |
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const TUint KMaxBlockSizeSupported = 32; |
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/** |
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Abstract base class for symmetric cipher plug-ins. |
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*/ |
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namespace HwCrypto |
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{ |
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using namespace CryptoSpi; |
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class __NOTSHARED CH4CipherImpl : public CBase, public MSymmetricCipher |
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{ |
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public: |
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/** |
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Implemented by each cipher subclass to determine whether the |
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specified key length is valid for that cipher. |
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This is called by ConstructL and SetKeyL |
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@param aKeyLength The key length in bytes to verify. |
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*/ |
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virtual TBool IsValidKeyLength(TInt aKeyBytes) const = 0; |
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/** |
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Helper function implemented by concrete cipher sub-class that |
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allows GetCharacteristicsL to return the correct characteristics object. |
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@return The implemention uid |
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*/ |
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virtual TUid ImplementationUid() const = 0; |
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/** |
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Gets the strength of the current key, needed to check whether the cipher |
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may operate if strong cryptography is not enabled. |
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@return The strength of the current key |
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*/ |
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virtual TInt GetKeyStrength() const; |
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// Override MPlugin virtual functions |
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void Close(); |
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TAny* GetExtension(TUid aExtensionId); |
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void GetCharacteristicsL(const TCharacteristics*& aPluginCharacteristics); |
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void Reset(); // Always call reset in super-class if you override this |
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// End of MPlugin virtual functions |
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// Override MSymmetricCipherBase virtual functions |
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TInt KeySize() const; |
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virtual void SetKeyL(const CKey& aKey); |
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TInt BlockSize() const; |
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void SetCryptoModeL(TUid aCryptoMode); |
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void SetOperationModeL(TUid aOperationMode); |
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void SetPaddingModeL(TUid aPaddingMode); |
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void SetIvL(const TDesC8& aIv); |
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TInt MaxOutputLength(TInt aInputLength) const; |
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TInt MaxFinalOutputLength(TInt aInputLength) const; |
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void ProcessL(const TDesC8& aInput, TDes8& aOutput); |
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void ProcessFinalL(const TDesC8& aInput, TDes8& aOutput); |
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// End of MSymmetricCipherBase |
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/// Destructor |
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~CH4CipherImpl(); |
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106 |
protected: |
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107 |
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/** |
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Constructor |
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@param aBlockBytes The block size in bytes |
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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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*/ |
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CH4CipherImpl(TUint8 aBlockBytes, |
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TUid aCryptoMode, |
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TUid aOperationMode, |
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TUid aPaddingMode); |
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118 |
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119 |
/** |
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Second phase of construction. Always call ConstructL in the super-class |
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if your override this method. |
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122 |
|
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@param aKey The key to initialise the cipher with. |
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*/ |
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virtual void ConstructL(const CKey& aKey); |
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126 |
|
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127 |
/** |
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Creates the extended characteristics object. Concrete plug-in classes |
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may override this to customise the object returned by GetCharacteristics(); |
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|
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The default configuration is that plug-ins have unlimited concurrency, |
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cannot be reserved for exclusive use and are not CERTIFIED to be standards compliant. |
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@return The extended characteristics object |
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*/ |
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virtual CExtendedCharacteristics* CreateExtendedCharacteristicsL(); |
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136 |
|
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/** |
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Extracts the raw symmetric key from a generic key object. The buffer |
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is placed on the cleanup stack. |
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|
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@param aKey The key object |
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@return A buffer containing the raw key value |
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*/ |
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HBufC8* ExtractKeyDataLC(const CKey& aKey) const; |
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|
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|
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/** |
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DoSetDetails |
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149 |
|
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Reconfigure h/w based on iCryptoMode/iOperationMode/iKey/iIv |
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151 |
|
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Implemented by each cipher subclass. |
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*/ |
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virtual void DoSetupL() = 0; |
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|
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/** |
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DoWrite |
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158 |
|
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Blocking write of data to be transformed. Need not be a |
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multiple of the block size. |
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161 |
|
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Implemented by each cipher subclass. |
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*/ |
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virtual void DoWriteL(const TUint8* aBuffer, TUint aNumBytes) = 0; |
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|
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/** |
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DoRead |
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|
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Blocking read of transformed data. |
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170 |
|
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Need not be a multiple of the block size, but caller should |
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ensure enough blocks of data have been written to satisfy |
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the request. |
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174 |
|
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The data is appended to the supplied descriptor. |
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|
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Implemented by each cipher subclass. |
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*/ |
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virtual void DoReadL(TDes8 &aBuffer, TUint32 aLength) = 0; |
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|
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181 |
|
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protected: |
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183 |
|
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/// the key, extracted from a CKey object |
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HBufC8* iKey; |
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|
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/// key size in bytes |
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TUint iKeyBytes; |
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189 |
|
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/// Standards conformance information. |
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RArray<TUid> iStandardsConformance; |
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192 |
|
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/// block size in bytes, current largest block size is 16 bytes (AES) |
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TUint8 iBlockBytes; |
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/// encryption or decryption |
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TUid iCryptoMode; |
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/// The block cipher mode e.g. ECB, CBC |
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TUid iOperationMode; |
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/// the current padding scheme |
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TUid iPaddingMode; |
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201 |
|
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/// the initialisation vector |
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RBuf8 iIv; |
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204 |
|
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/// current padding scheme implementation |
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CPadding* iPadding; |
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/// buffer to store blocks |
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RBuf8 iPartialBlock; |
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/// buffer to store input / output of padding |
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RBuf8 iPaddingBlock; |
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|
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private: |
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TBool iNeedToSetupHw; |
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}; |
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} |
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#endif // __SYMMETRICCIPHERIMPL_H__ |