/*

 * Copyright (c) 2014, 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 8014374

 * @summary Ensure key wrap/unwrap works using AES/GCM/NoPadding

 * @key randomness

 */

import java.io.*;

import java.security.*;

import java.security.spec.*;

import java.util.*;

import javax.crypto.*;

import javax.crypto.spec.*;

public class TestGCMKeyWrap extends UcryptoTest {

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

        main(new TestGCMKeyWrap(), null);

    }

    public void doTest(Provider p) throws Exception {

        // check if GCM support exists

        try {

            Cipher.getInstance("AES/GCM/NoPadding", p);

        } catch (NoSuchAlgorithmException nsae) {

            System.out.println("Skipping Test due to no GCM support");

            return;

        }

        Random rdm = new Random();

        //init Secret Key

        byte[] keyValue = new byte[16];

        rdm.nextBytes(keyValue);

        SecretKey key = new SecretKeySpec(keyValue, "AES");

        Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding", p);

        cipher.init(Cipher.WRAP_MODE, key);

        byte[] wrappedKey = cipher.wrap(key);

        try { // make sure ISE is thrown if re-using the same key/IV

            wrappedKey = cipher.wrap(key);

            throw new Exception("FAIL: expected ISE not thrown");

        } catch(IllegalStateException ise){

            System.out.println("Expected ISE thrown for re-wrapping");

        }

        //unwrap the key

        AlgorithmParameters params = cipher.getParameters();

        cipher.init(Cipher.UNWRAP_MODE, key, params);

        Key unwrappedKey = cipher.unwrap(wrappedKey, "AES", Cipher.SECRET_KEY);

        //check if we can unwrap second time

        unwrappedKey = cipher.unwrap(wrappedKey, "AES", Cipher.SECRET_KEY);

        // Comparison

        if (!Arrays.equals(key.getEncoded(), unwrappedKey.getEncoded())) {

            throw new Exception("FAIL: keys are not equal");

        } else {

            System.out.println("Passed key equality check");

        }

    }

}