/*

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

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import java.nio.ByteBuffer;

import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;

import java.security.NoSuchProviderException;

import javax.crypto.Mac;

import javax.crypto.SecretKey;

/**

 * @test

 * @bug 8048603

 * @summary Checks if MAC algorithms work fine with empty buffer

 * @author Alexander Fomin

 * @build Utils

 * @run main EmptyByteBufferTest

 */

public class EmptyByteBufferTest implements MacTest {

    /**

     * @param args the command line arguments

     */

    public static void main(String[] args) {

        Utils.runTests(new EmptyByteBufferTest());

    }

    @Override

    public void doTest(String alg) throws NoSuchAlgorithmException,

            InvalidKeyException, NoSuchProviderException {

        SecretKey key = Utils.getSecretKeySpec();

        // instantiate Mac object and init it with a SecretKey

        Mac mac = Mac.getInstance(alg, "SunJCE");

        mac.init(key);

        // prepare buffer

        byte[] data = new byte[0];

        ByteBuffer buf = ByteBuffer.wrap(data);

        mac.update(buf);

        mac.doFinal();

    }

}