/*

* Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

#include <e32def.h>

#include "keys.h"

#include "asymmetriccipherimpl.h"

#include <cryptostrength.h>

#include <cryptospi/cryptospidef.h>

#include <cryptospi/plugincharacteristics.h>

#include "pluginconfig.h"

#include "common/inlines.h"

using namespace SoftwareCrypto;

CAsymmetricCipherImpl::CAsymmetricCipherImpl(

	TUid aCryptoMode,

	TUid aPaddingMode) :

	iCryptoMode(aCryptoMode),

	iPaddingMode(aPaddingMode)

	{

	}

void CAsymmetricCipherImpl::ConstructL(const CKey& aKey)

	{

	DoSetCryptoModeL(iCryptoMode);

	DoSetKeyL(aKey);

	DoSetPaddingModeL(iPaddingMode);

	}

CAsymmetricCipherImpl::~CAsymmetricCipherImpl()

	{

	delete iKey;

	delete iPadding;

	}

void CAsymmetricCipherImpl::Close()

	{

	delete this;

	}

void CAsymmetricCipherImpl::Reset()

	{

	}

TAny* CAsymmetricCipherImpl::GetExtension(TUid /*aExtensionId*/)

	{

	return 0;

	}

void CAsymmetricCipherImpl::GetCharacteristicsL(const TAny*& aPluginCharacteristics)

	{

	TInt numCiphers = sizeof(KAsymmetricCipherCharacteristics)/sizeof(TAsymmetricCipherCharacteristics*);

	TInt32 implUid = ImplementationUid().iUid;

	for (TInt i = 0; i < numCiphers; ++i)

		{

		if (KAsymmetricCipherCharacteristics[i]->cmn.iImplementationUID == implUid)

			{

			aPluginCharacteristics = KAsymmetricCipherCharacteristics[i];

			break;

			}

		}

	}

void CAsymmetricCipherImpl::SetKeyL(const CKey& aKey)

	{

	DoSetKeyL(aKey);

	}

void CAsymmetricCipherImpl::DoSetKeyL(const CKey& aKey)

	{

	delete iKey;								// delete any previous key

	iKey = CKey::NewL(aKey);

	}

void CAsymmetricCipherImpl::SetCryptoModeL(TUid aCryptoMode)

	{

	DoSetCryptoModeL(aCryptoMode);

	Reset();

	}

void CAsymmetricCipherImpl::DoSetCryptoModeL(TUid aCryptoMode)

	{

	switch (aCryptoMode.iUid)

		{

		case KCryptoModeEncrypt:

		case KCryptoModeDecrypt:

			break;

		default:

			User::Leave(KErrNotSupported);

		}

	iCryptoMode = aCryptoMode;

	}

void CAsymmetricCipherImpl::SetPaddingModeL(TUid aPaddingMode)

	{

	DoSetPaddingModeL(aPaddingMode);

	Reset();

	}

void CAsymmetricCipherImpl::DoSetPaddingModeL(TUid aPaddingMode)

	{

	CPadding* padding(0);

	TInt padlength = 0;

	switch (iCryptoMode.iUid)

		{

		case KCryptoModeEncrypt:

			padlength = GetMaximumOutputLengthL();

			break;

		case KCryptoModeDecrypt:

			padlength = GetMaximumInputLengthL();

			break;

		}

	switch (aPaddingMode.iUid)

		{

		case KPaddingModeNone:

			padding = CPaddingNone::NewL(padlength);

			break;

		case KPaddingModePkcs1_v1_5_Encryption:

			padding = CPaddingPKCS1Encryption::NewL(padlength);

			break;

		default:

			User::Leave(KErrNotSupported);

		}

	delete iPadding;

	iPadding = padding;

	iPaddingMode = aPaddingMode;

	}

// Methods implemented in subclass. No coverage here.

#ifdef _BullseyeCoverage

#pragma suppress_warnings on

#pragma BullseyeCoverage off

#pragma suppress_warnings off

#endif

TInt CAsymmetricCipherImpl::GetMaximumOutputLengthL() const

	{

	// Override in subclass

	User::Leave(KErrNotSupported);

	return 0;

	}

TInt CAsymmetricCipherImpl::GetMaximumInputLengthL() const

	{

	// Override in subclass

	User::Leave(KErrNotSupported);

	return 0;

	}