/*
 * Copyright (c) 2013, 2015, 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 8079129 8048830
 * @summary KeyStore API enhancements
 * @run main StoreSecretKeyTest
 */

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

// Store a secret key in a keystore and retrieve it again.

public class StoreSecretKeyTest {
    private final static String DIR = System.getProperty("test.src", ".");
    private static final char[] PASSWORD = "passphrase".toCharArray();
    private static final String KEYSTORE = "keystore.p12";
    private static final String CERT = DIR + "/trusted.pem";
    private static final String ALIAS = "my trusted cert";
    private static final String ALIAS2 = "my secret key";
    private enum ALGORITHM {
        DES(56),
        DESede(168),
        AES(128);
        final int len;
        ALGORITHM(int l) {
            len = l;
        }
        final int getLength() {
            return len;
        }
    }
    public static void main(String[] args) throws Exception {
        boolean isSecretkeyAlgSupported = false;
        // Skip test if AES is unavailable
        try {
            SecretKeyFactory.getInstance("AES");
        } catch (NoSuchAlgorithmException nsae) {
            System.out.println("AES is unavailable. Skipping test...");
            return;
        }

        for (ALGORITHM alg : ALGORITHM.values()) {
            isSecretkeyAlgSupported |= testSecretKeyAlgorithm(alg);
        }
        if (!isSecretkeyAlgSupported) {
            throw new Exception("None of the SecretKey algorithms is "
                    + "supported");
        }
    }

    private static boolean testSecretKeyAlgorithm(ALGORITHM algorithm) throws
            Exception {

        System.out.println("Testing algorithm : " + algorithm.name());
        new File(KEYSTORE).delete();
        try {
            KeyStore keystore = KeyStore.getInstance("PKCS12");
            keystore.load(null, null);

            // Set trusted certificate entry
            Certificate cert = loadCertificate(CERT);
            keystore.setEntry(ALIAS,
            new KeyStore.TrustedCertificateEntry(cert), null);
            // Set secret key entry
            SecretKey secretKey = generateSecretKey(algorithm.name(),
                    algorithm.len);
            if(secretKey == null) {
                return false;
            }
            keystore.setEntry(ALIAS2,
                new KeyStore.SecretKeyEntry(secretKey),
                new KeyStore.PasswordProtection(PASSWORD));

            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(ALIAS2,
                new KeyStore.PasswordProtection(PASSWORD));
            System.out.println("Retrieved entry: " + entry);

            if (entry instanceof KeyStore.SecretKeyEntry) {
                System.out.println("Retrieved secret key entry: " + entry);
            } else {
                throw new Exception("Not a secret key entry");
            }
        } catch (KeyStoreException | UnrecoverableKeyException ex) {
            System.out.println("Unable to check SecretKey algorithm due to "
                    + "exception: " + ex.getMessage());
            return false;
        }
        return true;
    }

    private static SecretKey generateSecretKey(String algorithm, int size)
        throws NoSuchAlgorithmException {
        KeyGenerator generator = KeyGenerator.getInstance(algorithm);
        generator.init(size);
        return generator.generateKey();
    }

    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);
        }
    }
}