Java example source code file (DHGenSecretKey.java)

This example Java source code file (DHGenSecretKey.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

aes, crypto, dhgensecretkey, error, exception, keyagreement, keypair, keypairgenerator, security, sunjce

The DHGenSecretKey.java Java example source code

/*
 * Copyright (c) 2005, 2007, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * @test
 * @bug 4936763
 * @summary Verify that DHKeyAgreement can generate secret key
 * objects for AES algorithm
 * @author Valerie Peng
 */
import java.security.*;
import java.security.interfaces.*;
import javax.crypto.*;

public class DHGenSecretKey {

    public static void main(String[] args) throws Exception {
        DHGenSecretKey test = new DHGenSecretKey();
        test.run();
    }

    public void run() throws Exception {
        // generate keyPairs using parameters
        KeyPairGenerator keyGen =
            KeyPairGenerator.getInstance("DH", "SunJCE");

        // Alice generates her key pairs
        KeyPair keyA = keyGen.generateKeyPair();

        // Bob generates his key pairs
        KeyPair keyB = keyGen.generateKeyPair();

        KeyAgreement bobAlice = KeyAgreement.getInstance("DH", "SunJCE");
        bobAlice.init(keyB.getPrivate());
        bobAlice.doPhase(keyA.getPublic(), true);
        byte[] keyMaterial = bobAlice.generateSecret();

        bobAlice.doPhase(keyA.getPublic(), true);
        SecretKey skey = bobAlice.generateSecret("AES");
        byte[] keyVal = skey.getEncoded();

        System.out.println("Generated " + keyVal.length*8 +
            "-bit AES key");
        for (int i = 0; i < keyVal.length; i++) {
            if (keyVal[i] != keyMaterial[i]) {
                throw new Exception("Error: key value comparison failed!");
            }
        }
        System.out.println("Test Passed");
    }
}