/*

 * Copyright (c) 2011, 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.

 */

/**

 * @see PublicKeyInterop.sh

 */

import java.security.*;

import java.util.*;

import javax.crypto.*;

import sun.misc.HexDumpEncoder;

/*

 * Confirm interoperability of RSA public keys between SunMSCAPI and SunJCE

 * security providers.

 */

public class PublicKeyInterop {

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

        PrivateKey privKey = null;

        Certificate cert = null;

        KeyStore ks = KeyStore.getInstance("Windows-MY");

        ks.load(null, null);

        System.out.println("Loaded keystore: Windows-MY");

        PublicKey myPuKey =

            (PublicKey) ks.getCertificate("6888925").getPublicKey();

        System.out.println("Public key is a " + myPuKey.getClass().getName());

        PrivateKey myPrKey = (PrivateKey) ks.getKey("6888925", null);

        System.out.println("Private key is a " + myPrKey.getClass().getName());

        System.out.println();

        byte[] plain = new byte[] {0x01, 0x02, 0x03, 0x04, 0x05};

        HexDumpEncoder hde = new HexDumpEncoder();

        System.out.println("Plaintext:\n" + hde.encode(plain) + "\n");

        Cipher rsa = Cipher.getInstance("RSA/ECB/PKCS1Padding");

        rsa.init(Cipher.ENCRYPT_MODE, myPuKey);

        byte[] encrypted = rsa.doFinal(plain);

        System.out.println("Encrypted plaintext using RSA Cipher from " +

            rsa.getProvider().getName() + " JCE provider\n");

        System.out.println(hde.encode(encrypted) + "\n");

        Cipher rsa2 = Cipher.getInstance("RSA/ECB/PKCS1Padding", "SunMSCAPI");

        rsa2.init(Cipher.ENCRYPT_MODE, myPuKey);

        byte[] encrypted2 = rsa2.doFinal(plain);

        System.out.println("Encrypted plaintext using RSA Cipher from " +

            rsa2.getProvider().getName() + " JCE provider\n");

        System.out.println(hde.encode(encrypted2) + "\n");

        Cipher rsa3 = Cipher.getInstance("RSA/ECB/PKCS1Padding", "SunMSCAPI");

        rsa3.init(Cipher.DECRYPT_MODE, myPrKey);

        byte[] decrypted = rsa3.doFinal(encrypted);

        System.out.println("Decrypted first ciphertext using RSA Cipher from " +

            rsa3.getProvider().getName() + " JCE provider\n");

        System.out.println(hde.encode(decrypted) + "\n");

        if (! Arrays.equals(plain, decrypted)) {

            throw new Exception("First decrypted ciphertext does not match " +

                "original plaintext");

        }

        decrypted = rsa3.doFinal(encrypted2);

        System.out.println("Decrypted second ciphertext using RSA Cipher from "

            + rsa3.getProvider().getName() + " JCE provider\n");

        System.out.println(hde.encode(decrypted) + "\n");

        if (! Arrays.equals(plain, decrypted)) {

            throw new Exception("Second decrypted ciphertext does not match " +

                "original plaintext");

        }

    }

}