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/*
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* Copyright (c) 2008-2009 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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* Cipher MAC plugin implementation
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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 __CRYPTOAPI_SOFTWARECIPHERMACIMPL_H__
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#define __CRYPTOAPI_SOFTWARECIPHERMACIMPL_H__
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#include "cryptosymmetriccipherapi.h"
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#include "keys.h"
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namespace SoftwareCrypto
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{
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using namespace CryptoSpi;
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/**
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* This is the maximum block size in bytes currently supported by CMAC implementation.
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*
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* The cipher based algorithms currently supported are
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* AES-XCBC-MAC-96 and AES-XCBC-PRF-128.
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*/
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const TInt KMacBlockSize = 16;
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/**
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* The class is created from following substance classes
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* 1. MMac
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* 2. CSymmetricCipher
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* Using the methods of the above classes we will transform/mould the Cipher methods in
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* a way as to be inline with the MMac interface methods. The MMac methods will
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* serve as the wrapper internal to which Cipher methods will work to provide the MAC value.
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*
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* The class was created to provide consistency/similarity HMAC and CMAC works.
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* Also for future extensibility of other Cipher algorithms.
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*/
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NONSHARABLE_CLASS(CCMacImpl) : public CBase
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{
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public:
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/**
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* Cipher MAC implementation instance creation methods
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*
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*The owneship of 'aSymmetricCipher' is imparted to instance of this class.
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*/
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static CCMacImpl* NewL(const CKey& aKey,
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CSymmetricCipher* aSymmetricCipher,
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TInt32 aAlgorithmUid);
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static CCMacImpl* NewLC(const CKey& aKey,
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CSymmetricCipher* aSymmetricCipher,
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TInt32 aAlgorithmUid);
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/**
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* Simulating Methods from MPlugin
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*/
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const CExtendedCharacteristics* GetExtendedCharacteristicsL();
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// We will call CSymmetricBlockCipherImpl::Reset();
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void Reset();
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/**
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* Simulating MAC interfaces (Software based)
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*/
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TPtrC8 MacL(const TDesC8& aMessage);
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void UpdateL(const TDesC8& aMessage);
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TPtrC8 FinalL(const TDesC8& aMessage);
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void ReInitialiseAndSetKeyL(const CKey& aKey);
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void SetKeyL(const CKey& aKey);
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~CCMacImpl();
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CCMacImpl* CopyL();
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CCMacImpl* ReplicateL();
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private:
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/**
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* Constructors
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*/
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CCMacImpl(CryptoSpi::CSymmetricCipher* aSymmetricCipher);
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CCMacImpl(const CCMacImpl&);
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/**
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* Initialize the 'iCipherImpl' instances.
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*/
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void ConstructL(const CKey& aKey, TInt32 aAlgorithmUid);
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void DoUpdateL(const TDesC8& aMessage);
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TPtrC8 DoFinalL();
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void PadMessage();
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void ProcessBlockL();
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void XORKeyWithData(const TDesC8& aKey, TDes8& aOutput);
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CKey* Create128bitKeyL(const CKey& aKey);
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private:
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TInt32 iImplementationUid;
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CKey* iKey;
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CryptoSpi::CSymmetricCipher* iCipherImpl;
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TBuf8<KMacBlockSize> iKey1;
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TBuf8<KMacBlockSize> iKey2;
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TBuf8<KMacBlockSize> iKey3;
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TBuf8<KMacBlockSize> iMacValue;
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TUint8 iE[KMacBlockSize];
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TUint8 iData[KMacBlockSize];
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TInt iCurrentTotalLength;
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// Resets the cipher with iE(128 zero bits) the next time MacL,
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// UpdateL or FinalL are called. This was introduced as we cannot leave from the
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// non-leaving CCMacImpl::Reset() implementation of the MPlugin::Reset() pure
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// virtual. To prevent behavioral break.
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TInt iDelayedReset;
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};
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}
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#endif // __CRYPTOAPI_SOFTWARECIPHERMACIMPL_H__
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