MacClone.java

/*
 * Copyright 1998-2007 Sun Microsystems, Inc.  All Rights Reserved.
 * 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.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

/*
 * @test
 * @bug 0000000
 * @summary MacClone
 * @author Jan Luehe
 */
import javax.crypto.*;

public class MacClone {

    public static void main(String[] args) throws Exception {

        //
        // Clone uninitialized Mac object
        //
        Mac mac = Mac.getInstance("HmacSHA1", "SunJCE");
        Mac macClone = (Mac)mac.clone();
        System.out.println(macClone.getProvider().toString());
        System.out.println(macClone.getAlgorithm());
        boolean thrown = false;
        try {
            macClone.update((byte)0x12);
        } catch (IllegalStateException ise) {
            thrown = true;
        }
        if (!thrown) {
            throw new Exception("Expected IllegalStateException not thrown");
        }

        //
        // Clone initialized Mac object
        //
        KeyGenerator kgen = KeyGenerator.getInstance("DES");
        SecretKey skey = kgen.generateKey();

        mac = Mac.getInstance("HmacSHA1");
        mac.init(skey);
        macClone = (Mac)mac.clone();
        System.out.println(macClone.getProvider().toString());
        System.out.println(macClone.getAlgorithm());
        mac.update((byte)0x12);
        macClone.update((byte)0x12);
        byte[] macFinal = mac.doFinal();
        byte[] macCloneFinal = macClone.doFinal();
        if (!java.util.Arrays.equals(macFinal, macCloneFinal)) {
            throw new Exception("MAC results are different");
        }
    }
}