/*

* Copyright (c) 2004 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:  Encryption/Decryption support functions

*

*/

// INCLUDE FILES

#include <e32std.h>

#include <e32base.h>

#include <e32math.h>

#include <s32buf.h>

#include <s32crypt.h>

#include "LMSecurity.h"

#include "LMSecurityEncrypt.h"

// ============================ MEMBER FUNCTIONS ===============================

// -----------------------------------------------------------------------------

// CLMSecurityEncrypt::CLMSecurityEncrypt

// Initialize the random key stream from a constant

// -----------------------------------------------------------------------------

//

CLMSecurityEncrypt::CLMSecurityEncrypt(

    const TDesC8& init)

    {

    TPckg<TUint> p(0);

    p.Copy(init);

    iKey = p();

    Math::Rand(iKey);

    }

// -----------------------------------------------------------------------------

// CLMSecurityEncrypt::EncryptL

// Encrypt using the key stream

// -----------------------------------------------------------------------------

//

TInt CLMSecurityEncrypt::EncryptL(

    TDes8& aOutput,

    const TDesC8& aInput)

    {

    TInt i;

    TUint8* ptr;

    ptr = const_cast<TUint8*>(aOutput.Ptr());

    for (i = 0; i < aInput.Size(); i++)

        {

        ptr[i] = static_cast<TUint8>(aInput[i] ^ Math::Rand(iKey));

        }

    aOutput.SetLength(aInput.Size());

    return aInput.Size();

    }

// -----------------------------------------------------------------------------

// CLMSecurityEncrypt::CompleteL

// Final encryption

// -----------------------------------------------------------------------------

//

TInt CLMSecurityEncrypt::CompleteL(

    TDes8& aOutput,

    const TDesC8& aInput)

    {

    return EncryptL(aOutput, aInput);

    }