/*

* Copyright (c) 2008 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:

*

*/

package java.security;

import com.nokia.mj.impl.security.MessageDigestImpl;

import java.security.PrivMessageDigestImpl;

/**

 * Refer JSR-177 Specification for details

 */

public abstract class MessageDigest

{

    // MessageDigest implementation

    private MessageDigestImpl iDigest;

    // Package private constructor.

    MessageDigest(MessageDigestImpl aDigest)

    {

        iDigest = aDigest;

    }

    /**

    * Refer JSR-177 Specification for details

    */

    static public MessageDigest getInstance(String aAlgorithm)

    throws NoSuchAlgorithmException

    {

        MessageDigestImpl digest = new MessageDigestImpl(aAlgorithm);

        return new PrivMessageDigestImpl(digest);

    }

    /**

    * Refer JSR-177 Specification for details

    */

    public int digest(byte[] aBuf, int aOffset, int aLength)

    throws DigestException

    {

        return iDigest.digest(aBuf, aOffset, aLength);

    }

    // Resets the digest for further use.

    public void reset()

    {

        iDigest.reset();

    }

    /**

    * Refer JSR-177 Specification for details

    */

    public void update(byte[] aInput, int aOffset, int aLength)

    {

        iDigest.update(aInput, aOffset, aLength);

    }

}