Java example source code file (StoreTrustedCertTest.java)

This example Java source code file (StoreTrustedCertTest.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

alias2, certificate, crypto, dir, exception, failed, fileinputstream, fileoutputstream, keystore, not, password, pkcs12attribute, security, storetrustedcerttest, string, util, x509certificate

The StoreTrustedCertTest.java Java example source code

/*
 * Copyright (c) 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 8005408
 * @summary KeyStore API enhancements
 */

import java.io.*;
import java.security.*;
import java.security.cert.*;
import java.util.*;
import java.security.cert.Certificate;
import javax.crypto.*;
import javax.crypto.spec.*;

// Store a trusted certificate in a keystore and retrieve it again.

public class StoreTrustedCertTest {
    private final static String DIR = System.getProperty("test.src", ".");
    private static final char[] PASSWORD = "passphrase".toCharArray();
    private static final String KEYSTORE = "truststore.p12";
    private static final String CERT = DIR + "/trusted.pem";
    private static final String ALIAS = "my trustedcert";
    private static final String ALIAS2 = "my trustedcert with attributes";

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

        new File(KEYSTORE).delete();

        KeyStore keystore = KeyStore.getInstance("PKCS12");
        keystore.load(null, null);

        Certificate cert = loadCertificate(CERT);
        Set<KeyStore.Entry.Attribute> attributes = new HashSet<>();
        attributes.add(new PKCS12Attribute("1.3.5.7.9", "that's odd"));
        attributes.add(new PKCS12Attribute("2.4.6.8.10", "that's even"));

        // Set trusted certificate entry
        keystore.setEntry(ALIAS,
            new KeyStore.TrustedCertificateEntry(cert), null);

        // Set trusted certificate entry with attributes
        keystore.setEntry(ALIAS2,
            new KeyStore.TrustedCertificateEntry(cert, attributes), null);

        try (FileOutputStream outStream = new FileOutputStream(KEYSTORE)) {
            System.out.println("Storing keystore to: " + KEYSTORE);
            keystore.store(outStream, PASSWORD);
        }

        try (FileInputStream inStream = new FileInputStream(KEYSTORE)) {
            System.out.println("Loading keystore from: " + KEYSTORE);
            keystore.load(inStream, PASSWORD);
            System.out.println("Loaded keystore with " + keystore.size() +
                " entries");
        }

        KeyStore.Entry entry = keystore.getEntry(ALIAS, null);
        if (entry instanceof KeyStore.TrustedCertificateEntry) {
            System.out.println("Retrieved trusted certificate entry: " + entry);
        } else {
            throw new Exception("Not a trusted certificate entry");
        }
        System.out.println();

        entry = keystore.getEntry(ALIAS2, null);
        if (entry instanceof KeyStore.TrustedCertificateEntry) {
            KeyStore.TrustedCertificateEntry trustedEntry =
                (KeyStore.TrustedCertificateEntry) entry;
            Set<KeyStore.Entry.Attribute> entryAttributes =
                trustedEntry.getAttributes();

            if (entryAttributes.containsAll(attributes)) {
                System.out.println("Retrieved trusted certificate entry " +
                    "with attributes: " + entry);
            } else {
                throw new Exception("Failed to retrieve entry attributes");
            }
        } else {
            throw new Exception("Not a trusted certificate entry");
        }
    }

    private static Certificate loadCertificate(String certFile)
        throws Exception {
        X509Certificate cert = null;
        try (FileInputStream certStream = new FileInputStream(certFile)) {
            CertificateFactory factory =
                CertificateFactory.getInstance("X.509");
            return factory.generateCertificate(certStream);
        }
    }
}