1 /*

     2  * Copyright (c) 2006, 2007, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 

    25 /**

    26  * @see RSAEncryptDecrypt.sh

    27  */

    28 

    29 import javax.crypto.Cipher;

    30 import java.security.GeneralSecurityException;

    31 import java.security.KeyPairGenerator;

    32 import java.security.KeyPair;

    33 import java.security.Key;

    34 

    35 public class RSAEncryptDecrypt {

    36     public static final byte[] PLAINTEXT = {1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6};

    37 

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

    39 

    40         KeyPairGenerator generator =

    41             KeyPairGenerator.getInstance("RSA", "SunMSCAPI");

    42 

    43         KeyPair keyPair = generator.generateKeyPair();

    44         Key publicKey = keyPair.getPublic();

    45         Key privateKey = keyPair.getPrivate();

    46 

    47         Cipher cipher = null;

    48 

    49         try {

    50             cipher = Cipher.getInstance("RSA", "SunMSCAPI");

    51 

    52         } catch (GeneralSecurityException e) {

    53             System.out.println("Cipher not supported by provider, skipping...");

    54             return;

    55         }

    56 

    57         cipher.init(Cipher.ENCRYPT_MODE, publicKey);

    58         displayBytes("Plaintext data:", PLAINTEXT);

    59         byte[] data = cipher.doFinal(PLAINTEXT);

    60         displayBytes("Encrypted data:", data);

    61 

    62         cipher.init(Cipher.DECRYPT_MODE, privateKey);

    63         data = cipher.doFinal(data);

    64         displayBytes("Decrypted data:", data);

    65     }

    66 

    67     private static void displayBytes(String label, byte[] bytes) {

    68         System.out.println(label + " [length=" + bytes.length + "]");

    69         for (byte b : bytes) {

    70             System.out.print("0x" + Integer.toHexString(b & 0xFF) + " ");

    71         }

    72         System.out.println();

    73     }

    74 }