// 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 "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:

// Authentication Protocol with MD5 (CHAP with MD5) - RFC 1994.

// 

//

/**

 @file

 @brief Source file for the implementation of PPP Challenge Handshake

 @internalComponent

*/

#include "chapmd5.h"

// use CMD5

#include <hash.h>

#include "PPPConfig.h"

CPppChapMd5::CPppChapMd5()

/**

   Constructor. 

   @internalComponent

*/

	{

	}

CPppChapMd5::~CPppChapMd5()

/**

   Destructor.

   @internalComponent

*/

	{

#ifdef _UNICODE

	delete iUserName;

#endif

	delete iMd5;

	}

void CPppChapMd5::InitL(CPppLcp* aLcp)

/**

   @copydoc CPppChap::InitL(CPppLcp*)

   @see CPppChap::InitL(CPppLcp*)

   @internalComponent

*/

	{

	CPppChap::InitL(aLcp);

	iMd5 = CMD5::NewL();

	}

void CPppChapMd5::MakeResponseL(TUint8 /*aChallengeId*/, 

				const TDesC8& aChallengeValue, 

				TPtrC8& aResponseValue, 

				TPtrC8& aResponseName)

/**

   @copydoc CPppChap::MakeResponseL(TUint8, const TDesC8&, TPtrC8&,

   TPtrC8&)

   @see CPppChap::MakeResponseL(TUint8, const TDesC8&, TPtrC8&,

   TPtrC8&)

   @internalComponent

*/

	{

	ASSERT(aChallengeValue.Length() >= KPppChapMinValueSize);

    const CCredentialsConfig* credentials = iPppLcp->GetCredentials();

	const TDesC& username = credentials->GetUserName();

	__ASSERT_ALWAYS(username.Length() <= 

				KMaxTInt16 - 

				KPppChapCodeFieldSize -

				KPppChapIdFieldSize - 

				KPppChapLengthFieldSize -

				KPppChapValueSizeFieldSize -

				aResponseValue.Length(), 

			User::Leave(KErrTooBig));

#ifdef _UNICODE

	delete iUserName;

	iUserName=0;

	iUserName = HBufC8::NewL(username.Length());

	iUserName->Des().Copy(username);

 	aResponseName.Set(*iUserName);

	const TDesC& pwd=credentials->GetPassword();

	HBufC8& password = *HBufC8::NewLC(pwd.Length());

 	password.Des().Copy(pwd);

#else //! _UNICODE

	aResponseName.Set(username);

	const TDesC& password = credentials->GetPassword();

#endif //! _UNICODE

	iMd5->Update(TPtrC8(&iCurrentId, KPppChapIdFieldSize));

	iMd5->Update(password);

	aResponseValue.Set(iMd5->Final(aChallengeValue));

#ifdef _UNICODE

	CleanupStack::PopAndDestroy(&password);

#endif // _UNICODE

	ASSERT(aResponseValue.Length() == KPppChapMd5ValueSize);

	ASSERT(aResponseName.Length() >= KPppChapMinNameSize &&

		   aResponseName.Length() <= 

		   KMaxTInt16 - 

		   KPppChapCodeFieldSize -

		   KPppChapIdFieldSize - 

		   KPppChapLengthFieldSize -

		   KPppChapValueSizeFieldSize -

		   aResponseValue.Length());

	}