/*

 * Copyright (c) 2012, 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 6414899

 * @summary Ensure the cloning functionality works.

 * @author Valerie Peng

 * @library ..

 */

import java.util.*;

import java.security.*;

public class TestCloning extends PKCS11Test {

    private static final String[] ALGOS = {

        "MD2", "MD5", "SHA1", "SHA-224", "SHA-256", "SHA-384", "SHA-512"

    };

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

        main(new TestCloning());

    }

    private static final byte[] data1 = new byte[10];

    private static final byte[] data2 = new byte[10*1024];

    public void main(Provider p) throws Exception {

        Random r = new Random();

        byte[] data1 = new byte[10];

        byte[] data2 = new byte[2*1024];

        r.nextBytes(data1);

        r.nextBytes(data2);

        System.out.println("Testing against provider " + p.getName());

        for (int i = 0; i < ALGOS.length; i++) {

            if (p.getService("MessageDigest", ALGOS[i]) == null) {

                System.out.println(ALGOS[i] + " is not supported, skipping");

                continue;

            } else {

                System.out.println("Testing " + ALGOS[i] + " of " + p.getName());

                MessageDigest md = MessageDigest.getInstance(ALGOS[i], p);

                try {

                    md = testCloning(md, p);

                    // repeat the test again after generating digest once

                    for (int j = 0; j < 10; j++) {

                        md = testCloning(md, p);

                    }

                } catch (Exception ex) {

                    if (ALGOS[i] == "MD2" &&

                        p.getName().equalsIgnoreCase("SunPKCS11-NSS")) {

                        // known bug in NSS; ignore for now

                        System.out.println("Ignore Known bug in MD2 of NSS");

                        continue;

                    }

                    throw ex;

                }

            }

        }

    }

    private static MessageDigest testCloning(MessageDigest mdObj, Provider p)

        throws Exception {

        // copy#0: clone at state BLANK w/o any data

        MessageDigest mdCopy0 = (MessageDigest) mdObj.clone();

        // copy#1: clone again at state BUFFERED w/ very short data

        mdObj.update(data1);

        mdCopy0.update(data1);

        MessageDigest mdCopy1 = (MessageDigest) mdObj.clone();

        // copy#2: clone again after updating it w/ long data to trigger

        // the state into INIT

        mdObj.update(data2);

        mdCopy0.update(data2);

        mdCopy1.update(data2);

        MessageDigest mdCopy2 = (MessageDigest) mdObj.clone();

        // copy#3: clone again after updating it w/ very short data

        mdObj.update(data1);

        mdCopy0.update(data1);

        mdCopy1.update(data1);

        mdCopy2.update(data1);

        MessageDigest mdCopy3 = (MessageDigest) mdObj.clone();

        // copy#4: clone again after updating it w/ long data

        mdObj.update(data2);

        mdCopy0.update(data2);

        mdCopy1.update(data2);

        mdCopy2.update(data2);

        mdCopy3.update(data2);

        MessageDigest mdCopy4 = (MessageDigest) mdObj.clone();

        // check digest equalities

        byte[] answer = mdObj.digest();

        byte[] result0 = mdCopy0.digest();

        byte[] result1 = mdCopy1.digest();

        byte[] result2 = mdCopy2.digest();

        byte[] result3 = mdCopy3.digest();

        byte[] result4 = mdCopy4.digest();

        check(answer, result0, "copy0");

        check(answer, result1, "copy1");

        check(answer, result2, "copy2");

        check(answer, result3, "copy3");

        check(answer, result4, "copy4");

        return mdCopy3;

    }

    private static void check(byte[] d1, byte[] d2, String copyName)

            throws Exception {

        if (Arrays.equals(d1, d2) == false) {

            throw new RuntimeException(copyName + " digest mismatch!");

        }

    }

}