/*

* Copyright (c) 2003-2009 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 <asymmetric.h>

#include <asymmetrickeys.h>

#include <bigint.h>

#include <securityerr.h>

#include "rsafunction.h"

/* CRSAVerifier */

EXPORT_C CRSAVerifier::CRSAVerifier(void)

	{

	}

EXPORT_C TBool CRSAVerifier::VerifyL(const TDesC8& aInput, 

	const CRSASignature& aSignature) const

	{

	TBool retval = EFalse;

	HBufC8* inverseSign = InverseSignLC(aSignature);

	if (inverseSign->Compare(aInput)==0)

		{

		retval = ETrue;

		}

	CleanupStack::PopAndDestroy(inverseSign);

	return retval;	

	}

/* CRSAPKCS1v15Verifier */

EXPORT_C CRSAPKCS1v15Verifier* CRSAPKCS1v15Verifier::NewL( 

	const CRSAPublicKey& aKey)

	{

	CRSAPKCS1v15Verifier* self = NewLC(aKey);

	CleanupStack::Pop();

	return self;

	}

EXPORT_C CRSAPKCS1v15Verifier* CRSAPKCS1v15Verifier::NewLC(

	const CRSAPublicKey& aKey)

	{

	CRSAPKCS1v15Verifier* self = new(ELeave) CRSAPKCS1v15Verifier(aKey);

	CleanupStack::PushL(self);

	self->ConstructL();

	return self;

	}

TInt CRSAPKCS1v15Verifier::MaxInputLength(void) const

	{

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

	}

TInt CRSAPKCS1v15Verifier::MaxOutputLength(void) const

	{

	return iPublicKey.N().ByteCount();

	}

HBufC8* CRSAPKCS1v15Verifier::InverseSignLC(

	const CRSASignature& aSignature) const

	{

	HBufC8* unpaddedBuf = HBufC8::NewMaxLC(MaxOutputLength());

	TPtr8 unpaddedHash = unpaddedBuf->Des();

	RInteger input = RInteger::NewL(aSignature.S());

	CleanupStack::PushL(input);

	RInteger output;

	RSAFunction::VerifyL(iPublicKey, input, output);

	CleanupStack::PushL(output);

	TPtrC8 paddedHashPtr = *(output.BufferLC());

	iPadding->UnPadL(paddedHashPtr, unpaddedHash);

	CleanupStack::PopAndDestroy(3, &input); //BufferLC, output, input

	return unpaddedBuf;

	}

CRSAPKCS1v15Verifier::CRSAPKCS1v15Verifier(const CRSAPublicKey& aKey)

	: iPublicKey(aKey)

	{

	}

void CRSAPKCS1v15Verifier::ConstructL(void)

	{

	iPadding = CPaddingPKCS1Signature::NewL(MaxOutputLength());

	// Check if MaxInputLength() makes sense, if not the key length must 

	// be too small

	if(MaxInputLength() <= 0)

		{

		User::Leave(KErrKeySize);

		}

	}

CRSAPKCS1v15Verifier::~CRSAPKCS1v15Verifier(void)

	{

	delete iPadding;

	}