/*

* 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 "rsasignerimpl.h"

#include "pluginconfig.h"

#include "rsafunction.h"

using namespace SoftwareCrypto;

// Implementation of CRSASignerImpl 

CRSASignerImpl* CRSASignerImpl::NewL(const CKey& aKey, TUid aPaddingMode)

	{

	CRSASignerImpl* self = CRSASignerImpl::NewLC(aKey, aPaddingMode);

	CleanupStack::Pop(self);

	return self;

	}

CRSASignerImpl* CRSASignerImpl::NewLC(const CKey& aKey, TUid aPaddingMode)

	{

	CRSASignerImpl* self = new(ELeave) CRSASignerImpl(aPaddingMode);

	CleanupStack::PushL(self);

	self->ConstructL(aKey);

	return self;

	}

CRSASignerImpl::CRSASignerImpl(TUid aPaddingMode) 

	: iPaddingMode(aPaddingMode)

	{

	}

CRSASignerImpl::~CRSASignerImpl()

	{

	delete iPadding;

	}

void CRSASignerImpl::ConstructL(const CKey& aKey)

	{

	CSignerImpl::ConstructL(aKey);

	SetPaddingModeL(iPaddingMode);

	}

CExtendedCharacteristics* CRSASignerImpl::CreateExtendedCharacteristicsL()

	{

	// All Symbian software plug-ins have unlimited concurrency, cannot be reserved

	// for exclusive use and are not CERTIFIED to be standards compliant.

	return CExtendedCharacteristics::NewL(KMaxTInt, EFalse);

	}

const CExtendedCharacteristics* CRSASignerImpl::GetExtendedCharacteristicsL()

	{

	return CRSASignerImpl::CreateExtendedCharacteristicsL();

	}

TUid CRSASignerImpl::ImplementationUid() const

	{

	return KCryptoPluginRsaSignerUid;

	}

void CRSASignerImpl::SetKeyL(const CKey& aPrivateKey) 

	{

	DoSetKeyL(aPrivateKey);

	Reset();

	}

void CRSASignerImpl::SetPaddingModeL(TUid aPaddingMode)

	{

	CPadding* padding(0);

	switch (aPaddingMode.iUid)

		{

		case KPaddingModeNone:

			padding = CPaddingNone::NewL(GetMaximumOutputLengthL());

			break;

		case KPaddingModePkcs1_v1_5_Signature:

			padding = CPaddingPKCS1Signature::NewL(GetMaximumOutputLengthL());

			break;

		default:

			User::Leave(KErrNotSupported);

		}

	delete iPadding;

	iPadding = padding;

	iPaddingMode = aPaddingMode;

	Reset();

	}

TInt CRSASignerImpl::GetMaximumInputLengthL() const

	{

	return GetMaximumOutputLengthL() - iPadding->MinPaddingLength();	

	}

TInt CRSASignerImpl::GetMaximumOutputLengthL() const

	{

	const TInteger& paramN = iKey->GetBigIntL(KRsaKeyParameterNUid);

	return paramN.ByteCount();	

	}

void CRSASignerImpl::SignL(const TDesC8& aInput, CCryptoParams& aSignature) 

	{

	HBufC8* buf = HBufC8::NewLC(GetMaximumOutputLengthL());

	TPtr8 ptr = buf->Des();

	//The following will panic if aInput is larger than MaxOutputLength() It is

	//likely that the caller has passed in something that has not been hashed.

	//This is a programming, and likely a security error, in client code, not a

	//problem here.

	iPadding->PadL(aInput, ptr);

	RInteger input = RInteger::NewL(ptr);

	CleanupClosePushL(input);

	RInteger output;

	RSAFunction::SignL(*iKey, input, output);

	CleanupClosePushL(output);

	aSignature.AddL(output, KRsaSignatureParameterSUid);

	CleanupStack::PopAndDestroy(3, buf); //input, buf

	}