/*

* 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"

/* CRSASigner */

EXPORT_C CRSASigner::CRSASigner(void)

	{

	}

/* CRSAPKCS1v15Signer */

EXPORT_C CRSAPKCS1v15Signer* CRSAPKCS1v15Signer::NewL(

	const CRSAPrivateKey& aKey)

	{

	CRSAPKCS1v15Signer* self = NewLC(aKey);

	CleanupStack::Pop(self);

	return self;

	}

EXPORT_C CRSAPKCS1v15Signer* CRSAPKCS1v15Signer::NewLC(

	const CRSAPrivateKey& aKey)

	{

	CRSAPKCS1v15Signer* self = new(ELeave) CRSAPKCS1v15Signer(aKey);

	CleanupStack::PushL(self);

	self->ConstructL();

	return self;

	}

TInt CRSAPKCS1v15Signer::MaxInputLength(void) const

	{

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

	}

TInt CRSAPKCS1v15Signer::MaxOutputLength(void) const

	{

	return iPrivateKey.N().ByteCount();	

	}

CRSASignature* CRSAPKCS1v15Signer::SignL(const TDesC8& aInput) const

	{

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

	TPtr8 ptr = buf->Des();

	ptr.SetLength(aInput.Length());

	//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);

	CleanupStack::PushL(input);

	RInteger output;

	RSAFunction::SignL(iPrivateKey, input, output);

	CleanupStack::PushL(output);

	CRSASignature* signature = CRSASignature::NewL(output);

	CleanupStack::Pop(&output); //output, now owned by CRSASignature

	CleanupStack::PopAndDestroy(2, buf); //input, buf

	return signature;

	}

CRSAPKCS1v15Signer::CRSAPKCS1v15Signer(const CRSAPrivateKey& aKey)  

	: iPrivateKey(aKey)

	{

	}

void CRSAPKCS1v15Signer::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);

		}

	}

CRSAPKCS1v15Signer::~CRSAPKCS1v15Signer(void)  

	{

	delete iPadding;

	}