sl@0: /*
sl@0: * Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: * All rights reserved.
sl@0: * This component and the accompanying materials are made available
sl@0: * under the terms of the License "Eclipse Public License v1.0"
sl@0: * which accompanies this distribution, and is available
sl@0: * at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: *
sl@0: * Initial Contributors:
sl@0: * Nokia Corporation - initial contribution.
sl@0: *
sl@0: * Contributors:
sl@0: *
sl@0: * Description: 
sl@0: *
sl@0: */
sl@0: 
sl@0: 
sl@0: #include "rsasignerimpl.h"
sl@0: #include "pluginconfig.h"
sl@0: #include "rsafunction.h"
sl@0: 
sl@0: using namespace SoftwareCrypto;
sl@0: 
sl@0: // Implementation of CRSASignerImpl 
sl@0: CRSASignerImpl* CRSASignerImpl::NewL(const CKey& aKey, TUid aPaddingMode)
sl@0: 	{
sl@0: 	CRSASignerImpl* self = CRSASignerImpl::NewLC(aKey, aPaddingMode);
sl@0: 	CleanupStack::Pop(self);
sl@0: 	return self;
sl@0: 	}
sl@0: 
sl@0: CRSASignerImpl* CRSASignerImpl::NewLC(const CKey& aKey, TUid aPaddingMode)
sl@0: 	{
sl@0: 	CRSASignerImpl* self = new(ELeave) CRSASignerImpl(aPaddingMode);
sl@0: 	CleanupStack::PushL(self);
sl@0: 	self->ConstructL(aKey);
sl@0: 	return self;
sl@0: 	}
sl@0: 
sl@0: CRSASignerImpl::CRSASignerImpl(TUid aPaddingMode) 
sl@0: 	: iPaddingMode(aPaddingMode)
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: CRSASignerImpl::~CRSASignerImpl()
sl@0: 	{
sl@0: 	delete iPadding;
sl@0: 	}
sl@0: 
sl@0: void CRSASignerImpl::ConstructL(const CKey& aKey)
sl@0: 	{
sl@0: 	CSignerImpl::ConstructL(aKey);
sl@0: 	SetPaddingModeL(iPaddingMode);
sl@0: 	}
sl@0: 
sl@0: CExtendedCharacteristics* CRSASignerImpl::CreateExtendedCharacteristicsL()
sl@0: 	{
sl@0: 	// All Symbian software plug-ins have unlimited concurrency, cannot be reserved
sl@0: 	// for exclusive use and are not CERTIFIED to be standards compliant.
sl@0: 	return CExtendedCharacteristics::NewL(KMaxTInt, EFalse);
sl@0: 	}
sl@0: 
sl@0: const CExtendedCharacteristics* CRSASignerImpl::GetExtendedCharacteristicsL()
sl@0: 	{
sl@0: 	return CRSASignerImpl::CreateExtendedCharacteristicsL();
sl@0: 	}
sl@0: 
sl@0: TUid CRSASignerImpl::ImplementationUid() const
sl@0: 	{
sl@0: 	return KCryptoPluginRsaSignerUid;
sl@0: 	}
sl@0: 
sl@0: void CRSASignerImpl::SetKeyL(const CKey& aPrivateKey) 
sl@0: 	{
sl@0: 	DoSetKeyL(aPrivateKey);
sl@0: 	Reset();
sl@0: 	}
sl@0: 
sl@0: void CRSASignerImpl::SetPaddingModeL(TUid aPaddingMode)
sl@0: 	{
sl@0: 	CPadding* padding(0);
sl@0: 	switch (aPaddingMode.iUid)
sl@0: 		{
sl@0: 		case KPaddingModeNone:
sl@0: 			padding = CPaddingNone::NewL(GetMaximumOutputLengthL());
sl@0: 			break;
sl@0: 		case KPaddingModePkcs1_v1_5_Signature:
sl@0: 			padding = CPaddingPKCS1Signature::NewL(GetMaximumOutputLengthL());
sl@0: 			break;
sl@0: 		default:
sl@0: 			User::Leave(KErrNotSupported);
sl@0: 		}
sl@0: 		
sl@0: 	delete iPadding;
sl@0: 	iPadding = padding;
sl@0: 	iPaddingMode = aPaddingMode;
sl@0: 	Reset();
sl@0: 	}
sl@0: 
sl@0: TInt CRSASignerImpl::GetMaximumInputLengthL() const
sl@0: 	{
sl@0: 	return GetMaximumOutputLengthL() - iPadding->MinPaddingLength();	
sl@0: 	}
sl@0: 
sl@0: TInt CRSASignerImpl::GetMaximumOutputLengthL() const
sl@0: 	{
sl@0: 	const TInteger& paramN = iKey->GetBigIntL(KRsaKeyParameterNUid);
sl@0: 	return paramN.ByteCount();	
sl@0: 	}
sl@0: 
sl@0: void CRSASignerImpl::SignL(const TDesC8& aInput, CCryptoParams& aSignature) 
sl@0: 	{
sl@0: 	HBufC8* buf = HBufC8::NewLC(GetMaximumOutputLengthL());
sl@0: 	TPtr8 ptr = buf->Des();
sl@0: 	
sl@0: 	//The following will panic if aInput is larger than MaxOutputLength() It is
sl@0: 	//likely that the caller has passed in something that has not been hashed.
sl@0: 	//This is a programming, and likely a security error, in client code, not a
sl@0: 	//problem here.
sl@0: 	iPadding->PadL(aInput, ptr);
sl@0: 
sl@0: 	RInteger input = RInteger::NewL(ptr);
sl@0: 	CleanupClosePushL(input);
sl@0: 	RInteger output;
sl@0: 
sl@0: 	RSAFunction::SignL(*iKey, input, output);
sl@0: 	CleanupClosePushL(output);
sl@0: 
sl@0: 	aSignature.AddL(output, KRsaSignatureParameterSUid);
sl@0: 	CleanupStack::PopAndDestroy(3, buf); //input, buf
sl@0: 	}