sl@0: /*
sl@0: * Copyright (c) 2003-2009 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 <asymmetric.h>
sl@0: #include <asymmetrickeys.h>
sl@0: #include <bigint.h>
sl@0: #include <securityerr.h>
sl@0: #include "rsafunction.h"
sl@0: 
sl@0: /* CRSAVerifier */
sl@0: 
sl@0: EXPORT_C CRSAVerifier::CRSAVerifier(void)
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: EXPORT_C TBool CRSAVerifier::VerifyL(const TDesC8& aInput, 
sl@0: 	const CRSASignature& aSignature) const
sl@0: 	{
sl@0: 	TBool retval = EFalse;
sl@0: 	HBufC8* inverseSign = InverseSignLC(aSignature);
sl@0: 	
sl@0: 	if (inverseSign->Compare(aInput)==0)
sl@0: 		{
sl@0: 		retval = ETrue;
sl@0: 		}
sl@0: 	CleanupStack::PopAndDestroy(inverseSign);
sl@0: 	return retval;	
sl@0: 	}
sl@0: 
sl@0: /* CRSAPKCS1v15Verifier */
sl@0: EXPORT_C CRSAPKCS1v15Verifier* CRSAPKCS1v15Verifier::NewL( 
sl@0: 	const CRSAPublicKey& aKey)
sl@0: 	{
sl@0: 	CRSAPKCS1v15Verifier* self = NewLC(aKey);
sl@0: 	CleanupStack::Pop();
sl@0: 	return self;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C CRSAPKCS1v15Verifier* CRSAPKCS1v15Verifier::NewLC(
sl@0: 	const CRSAPublicKey& aKey)
sl@0: 	{
sl@0: 	CRSAPKCS1v15Verifier* self = new(ELeave) CRSAPKCS1v15Verifier(aKey);
sl@0: 	CleanupStack::PushL(self);
sl@0: 	self->ConstructL();
sl@0: 	return self;
sl@0: 	}
sl@0: 
sl@0: TInt CRSAPKCS1v15Verifier::MaxInputLength(void) const
sl@0: 	{
sl@0: 	return MaxOutputLength() - iPadding->MinPaddingLength();	
sl@0: 	}
sl@0: 
sl@0: TInt CRSAPKCS1v15Verifier::MaxOutputLength(void) const
sl@0: 	{
sl@0: 	return iPublicKey.N().ByteCount();
sl@0: 	}
sl@0: 
sl@0: HBufC8* CRSAPKCS1v15Verifier::InverseSignLC(
sl@0: 	const CRSASignature& aSignature) const
sl@0: 	{
sl@0: 	HBufC8* unpaddedBuf = HBufC8::NewMaxLC(MaxOutputLength());
sl@0: 	TPtr8 unpaddedHash = unpaddedBuf->Des();
sl@0: 
sl@0: 	RInteger input = RInteger::NewL(aSignature.S());
sl@0: 	CleanupStack::PushL(input);
sl@0: 	RInteger output;
sl@0: 
sl@0: 	RSAFunction::VerifyL(iPublicKey, input, output);
sl@0: 	CleanupStack::PushL(output);
sl@0: 
sl@0: 	TPtrC8 paddedHashPtr = *(output.BufferLC());
sl@0: 	
sl@0: 	iPadding->UnPadL(paddedHashPtr, unpaddedHash);
sl@0: 	CleanupStack::PopAndDestroy(3, &input); //BufferLC, output, input
sl@0: 	return unpaddedBuf;
sl@0: 	}
sl@0: 
sl@0: CRSAPKCS1v15Verifier::CRSAPKCS1v15Verifier(const CRSAPublicKey& aKey)
sl@0: 	: iPublicKey(aKey)
sl@0: 	{
sl@0: 	}
sl@0: 
sl@0: void CRSAPKCS1v15Verifier::ConstructL(void)
sl@0: 	{
sl@0: 	iPadding = CPaddingPKCS1Signature::NewL(MaxOutputLength());
sl@0: 
sl@0: 	// Check if MaxInputLength() makes sense, if not the key length must 
sl@0: 	// be too small
sl@0: 	if(MaxInputLength() <= 0)
sl@0: 		{
sl@0: 		User::Leave(KErrKeySize);
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: CRSAPKCS1v15Verifier::~CRSAPKCS1v15Verifier(void)
sl@0: 	{
sl@0: 	delete iPadding;
sl@0: 	}
sl@0: