os/security/cryptoplugins/cryptospiplugins/source/softwarecrypto/asymmetriccipherimpl.cpp
author sl@SLION-WIN7.fritz.box
Fri, 15 Jun 2012 03:10:57 +0200
changeset 0 bde4ae8d615e
permissions -rw-r--r--
First public contribution.
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/*
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* Copyright (c) 2006-2009 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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#include <e32def.h>
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#include "keys.h"
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#include "asymmetriccipherimpl.h"
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#include <cryptostrength.h>
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#include <cryptospi/cryptospidef.h>
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#include <cryptospi/plugincharacteristics.h>
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#include "pluginconfig.h"
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#include "common/inlines.h"
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using namespace SoftwareCrypto;
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CAsymmetricCipherImpl::CAsymmetricCipherImpl(
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	TUid aCryptoMode,
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	TUid aPaddingMode) :
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	iCryptoMode(aCryptoMode),
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	iPaddingMode(aPaddingMode)
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	{
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	}
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void CAsymmetricCipherImpl::ConstructL(const CKey& aKey)
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	{
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	DoSetCryptoModeL(iCryptoMode);
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	DoSetKeyL(aKey);
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	DoSetPaddingModeL(iPaddingMode);
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	}
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CAsymmetricCipherImpl::~CAsymmetricCipherImpl()
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	{
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	delete iKey;
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	delete iPadding;
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	}
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void CAsymmetricCipherImpl::Close()
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	{
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	delete this;
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	}
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void CAsymmetricCipherImpl::Reset()
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	{
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	}
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TAny* CAsymmetricCipherImpl::GetExtension(TUid /*aExtensionId*/)
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	{
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	return 0;
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	}
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void CAsymmetricCipherImpl::GetCharacteristicsL(const TAny*& aPluginCharacteristics)
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	{
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	TInt numCiphers = sizeof(KAsymmetricCipherCharacteristics)/sizeof(TAsymmetricCipherCharacteristics*);
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	TInt32 implUid = ImplementationUid().iUid;
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	for (TInt i = 0; i < numCiphers; ++i)
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		{
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		if (KAsymmetricCipherCharacteristics[i]->cmn.iImplementationUID == implUid)
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			{
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			aPluginCharacteristics = KAsymmetricCipherCharacteristics[i];
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			break;
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			}
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		}
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	}
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void CAsymmetricCipherImpl::SetKeyL(const CKey& aKey)
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	{
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	DoSetKeyL(aKey);
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	}
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void CAsymmetricCipherImpl::DoSetKeyL(const CKey& aKey)
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	{
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	delete iKey;								// delete any previous key
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	iKey = CKey::NewL(aKey);
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	}
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void CAsymmetricCipherImpl::SetCryptoModeL(TUid aCryptoMode)
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	{
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	DoSetCryptoModeL(aCryptoMode);
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	Reset();
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	}
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void CAsymmetricCipherImpl::DoSetCryptoModeL(TUid aCryptoMode)
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	{
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	switch (aCryptoMode.iUid)
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		{
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		case KCryptoModeEncrypt:
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		case KCryptoModeDecrypt:
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			break;
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		default:
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			User::Leave(KErrNotSupported);
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		}
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	iCryptoMode = aCryptoMode;
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	}
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void CAsymmetricCipherImpl::SetPaddingModeL(TUid aPaddingMode)
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	{
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	DoSetPaddingModeL(aPaddingMode);
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	Reset();
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	}
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void CAsymmetricCipherImpl::DoSetPaddingModeL(TUid aPaddingMode)
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	{
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	CPadding* padding(0);
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	TInt padlength = 0;
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	switch (iCryptoMode.iUid)
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		{
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		case KCryptoModeEncrypt:
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			padlength = GetMaximumOutputLengthL();
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			break;
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		case KCryptoModeDecrypt:
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			padlength = GetMaximumInputLengthL();
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			break;
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		}
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	switch (aPaddingMode.iUid)
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		{
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		case KPaddingModeNone:
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			padding = CPaddingNone::NewL(padlength);
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			break;
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		case KPaddingModePkcs1_v1_5_Encryption:
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			padding = CPaddingPKCS1Encryption::NewL(padlength);
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			break;
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		default:
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			User::Leave(KErrNotSupported);
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		}
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	delete iPadding;
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	iPadding = padding;
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	iPaddingMode = aPaddingMode;
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	}
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// Methods implemented in subclass. No coverage here.
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#ifdef _BullseyeCoverage
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#pragma suppress_warnings on
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#pragma BullseyeCoverage off
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#pragma suppress_warnings off
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#endif
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TInt CAsymmetricCipherImpl::GetMaximumOutputLengthL() const
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	{
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	// Override in subclass
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	User::Leave(KErrNotSupported);
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	return 0;
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	}
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TInt CAsymmetricCipherImpl::GetMaximumInputLengthL() const
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	{
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	// Override in subclass
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	User::Leave(KErrNotSupported);
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	return 0;
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	}
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