/*

* 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 <padding.h>

#include <cryptostrength.h>

#include <securityerr.h>

#include <cryptopanic.h>

#include "rsafunction.h"

EXPORT_C CRSAPKCS1v15Encryptor* CRSAPKCS1v15Encryptor::NewL( 

	const CRSAPublicKey& aKey)

	{

	CRSAPKCS1v15Encryptor* self = NewLC(aKey);

	CleanupStack::Pop(self);

	return self;

	}

EXPORT_C CRSAPKCS1v15Encryptor* CRSAPKCS1v15Encryptor::NewLC(

	const CRSAPublicKey& aKey)

	{

	CRSAPKCS1v15Encryptor* self = new(ELeave) CRSAPKCS1v15Encryptor(aKey);

	CleanupStack::PushL(self);

	self->ConstructL();

	return self;

	}

TInt CRSAPKCS1v15Encryptor::MaxInputLength(void) const

	{

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

	}

TInt CRSAPKCS1v15Encryptor::MaxOutputLength() const

	{

	return iPublicKey.N().ByteCount();	

	}

void CRSAPKCS1v15Encryptor::EncryptL(const TDesC8& aInput, TDes8& aOutput)const

	{

	__ASSERT_DEBUG(aOutput.MaxLength() >= MaxOutputLength(), User::Panic(KCryptoPanic, ECryptoPanicOutputDescriptorOverflow));

	__ASSERT_DEBUG(aInput.Length() <= MaxInputLength(), User::Panic(KCryptoPanic, ECryptoPanicInputTooLarge));

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

	TPtr8 ptr = buf->Des();

	iPadding->DoPadL(aInput, ptr);

	RInteger input = RInteger::NewL(ptr);

	CleanupStack::PushL(input);

	RInteger output;

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

	CleanupStack::PushL(output);

	aOutput.Append(*(output.BufferLC()));

	CleanupStack::PopAndDestroy(4, buf); //BufferLC, output, input, buf

	}

CRSAPKCS1v15Encryptor::CRSAPKCS1v15Encryptor(const CRSAPublicKey& aKey) 

	: iPublicKey(aKey)

	{

	}

void CRSAPKCS1v15Encryptor::ConstructL(void)

	{

	iPadding = CPaddingPKCS1Encryption::NewL(MaxOutputLength());

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

	// be too small

	if(MaxInputLength() <= 0)

		{

		User::Leave(KErrKeySize);

		}

	TCrypto::IsAsymmetricWeakEnoughL(iPublicKey.N().BitCount());

	}

CRSAPKCS1v15Encryptor::~CRSAPKCS1v15Encryptor(void)

	{

	delete iPadding;

	}