/*

 * Copyright (c) 1998, 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

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import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;

import java.security.NoSuchProviderException;

import java.security.SecureRandom;

import javax.crypto.Mac;

import javax.crypto.spec.SecretKeySpec;

/**

 * @test

 * @bug 8048603

 * @summary Check if doFinal and update operation result in same Mac

 * @author Yu-Ching Valerie Peng, Bill Situ, Alexander Fomin

 * @build Utils

 * @run main MacSameTest

 */

public class MacSameTest implements MacTest {

    private static final int MESSAGE_SIZE = 25;

    private static final int OFFSET = 5;

    private static final int KEY_SIZE = 70;

    /**

     * Initialize a message, instantiate a Mac object,

     * initialize the object with a SecretKey,

     * feed the message into the Mac object

     * all at once and get the output MAC as result1.

     * Reset the Mac object, chop the message into three pieces,

     * feed into the Mac object sequentially, and get the output MAC as result2.

     * Finally, compare result1 and result2 and see if they are the same.

     *

     * @param args the command line arguments

     */

    public static void main(String[] args) {

        Utils.runTests(new MacSameTest());

    }

    @Override

    public void doTest(String algo) throws NoSuchAlgorithmException,

            NoSuchProviderException, InvalidKeyException {

        Mac mac;

        try {

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

        } catch (NoSuchAlgorithmException nsae) {

            // depending on Solaris configuration,

            // it can support HMAC or not with Mac

            System.out.println("Expected NoSuchAlgorithmException thrown: "

                    + nsae);

            return;

        }

        byte[] plain = new byte[MESSAGE_SIZE];

        for (int i = 0; i < MESSAGE_SIZE; i++) {

            plain[i] = (byte) (i % 256);

        }

        byte[] tail = new byte[plain.length - OFFSET];

        System.arraycopy(plain, OFFSET, tail, 0, tail.length);

        SecureRandom srdm = new SecureRandom();

        byte[] keyVal = new byte[KEY_SIZE];

        srdm.nextBytes(keyVal);

        SecretKeySpec keySpec = new SecretKeySpec(keyVal, "HMAC");

        mac.init(keySpec);

        byte[] result1 = mac.doFinal(plain);

        mac.reset();

        mac.update(plain[0]);

        mac.update(plain, 1, OFFSET - 1);

        byte[] result2 = mac.doFinal(tail);

        if (!java.util.Arrays.equals(result1, result2)) {

            throw new RuntimeException("result1 and result2 are not the same");

        }

    }

}