// Copyright (c) 1997-2009 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:

//

/**

 @file

 @internalComponent

*/

#include <hash.h>

#include <e32math.h>

#include <obex.h>

#include "authentication.h"

_LIT8(KColonCharacter, ":");

CObexAuthenticator* CObexAuthenticator::NewL()

	{

	CObexAuthenticator* s = new(ELeave) CObexAuthenticator;

	CleanupStack::PushL(s);

	s->ConstructL();

	CleanupStack::Pop();

	return s;

	}

void CObexAuthenticator::ConstructL()

	{

	iMD5 = CMD5::NewL();

	}

CObexAuthenticator::CObexAuthenticator()

	{

	TTime time;

	time.UniversalTime();

	iSeed = time.Int64();

	}

CObexAuthenticator::~CObexAuthenticator()

	{

	delete iMD5;

	}

TInt CObexAuthenticator::GenerateNonce(TDes8& aNonce)

	{

	TTime time;

	time.UniversalTime();

	TInt64 randomNumber = Math::Rand(iSeed);

	randomNumber <<= 32;

	randomNumber += Math::Rand(iSeed);

	TBuf8<33> key;

	key.Zero();

	key.AppendNum(time.Int64(), EHex);

	key.Append(_L8(":"));

	key.AppendNum(randomNumber, EHex);

	iMD5->Reset();

	aNonce.Append(iMD5->Hash(key));

	return KErrNone;

	}

void CObexAuthenticator::GenerateResponseL(const TDesC8& aPasswd, const TNonce& aNonce, TRequestDigest& aRequestDigest)

	{

	//work out the length of buffer we need

	TInt buflen = aNonce.Length() + KColonCharacter().Length() + aPasswd.Length();

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

	TPtr8 ptr = buf->Des();

	ptr.Zero();

	ptr.Append(aNonce);

	ptr.Append(KColonCharacter);

	ptr.Append(aPasswd);

	iMD5->Reset();

	aRequestDigest.Append(iMD5->Hash(*buf));

	CleanupStack::PopAndDestroy();//buf

	}

void CObexAuthenticator::ChallengeResponseL(const TDesC8& aPasswd, const TNonce& aNonce, const TRequestDigest& aRequestDigest)

	{

	TRequestDigest digest;

	digest.Zero();

	GenerateResponseL(aPasswd, aNonce, digest);

	if (digest != aRequestDigest)

		User::Leave(KErrAccessDenied);

	}