Java example source code file (Test4626070.java)

This example Java source code file (Test4626070.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, algo, algorithmparameters, cbc, cipher, crypto, exception, gcm, key, keygenerator, keysize, pkcs5padding, security, string, sunjce, test4626070, util

The Test4626070.java Java example source code

/*
 * Copyright (c) 2002, 2013, 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 4626070
 * @summary Verify that AES cipher can wrap and unwrap keys
 * @author Valerie Peng
 */
import java.security.*;
import javax.crypto.*;
import java.util.*;


public class Test4626070 {
    private static final String ALGO = "AES";
    private static final int KEYSIZE = 16; // in bytes

    public void execute(String mode, String padding) throws Exception {
        String transformation = ALGO + "/" + mode + "/" + padding;
        Cipher ci = Cipher.getInstance(transformation, "SunJCE");
        KeyGenerator kg = KeyGenerator.getInstance(ALGO, "SunJCE");
        kg.init(KEYSIZE*8);
        SecretKey key = kg.generateKey();

        AlgorithmParameters params = ci.getParameters();

        // TEST FIX 4626070
        ci.init(Cipher.WRAP_MODE, key, params);
        byte[] wrappedKeyEncoding = ci.wrap(key);
        params = ci.getParameters();
        ci.init(Cipher.UNWRAP_MODE, key, params);
        Key recoveredKey = ci.unwrap(wrappedKeyEncoding, "AES",
                                     Cipher.SECRET_KEY);
        if (!key.equals(recoveredKey)) {
            throw new Exception(
                "key after wrap/unwrap is different from the original!");
        }
        System.out.println(transformation + ": Passed");
    }

    public static void main (String[] args) throws Exception {
        Security.addProvider(new com.sun.crypto.provider.SunJCE());

        Test4626070 test = new Test4626070();
        test.execute("CBC", "PKCS5Padding");
        test.execute("GCM", "NoPadding");
    }
}