| /* |
| * Copyright (c) 2006, 2007, 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 RSAEncryptDecrypt.sh |
| */ |
| |
| import javax.crypto.Cipher; |
| import java.security.GeneralSecurityException; |
| import java.security.KeyPairGenerator; |
| import java.security.KeyPair; |
| import java.security.Key; |
| |
| public class RSAEncryptDecrypt { |
| public static final byte[] PLAINTEXT = {1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6}; |
| |
| public static void main(String[] args) throws Exception { |
| |
| KeyPairGenerator generator = |
| KeyPairGenerator.getInstance("RSA", "SunMSCAPI"); |
| |
| KeyPair keyPair = generator.generateKeyPair(); |
| Key publicKey = keyPair.getPublic(); |
| Key privateKey = keyPair.getPrivate(); |
| |
| Cipher cipher = null; |
| |
| try { |
| cipher = Cipher.getInstance("RSA", "SunMSCAPI"); |
| |
| } catch (GeneralSecurityException e) { |
| System.out.println("Cipher not supported by provider, skipping..."); |
| return; |
| } |
| |
| cipher.init(Cipher.ENCRYPT_MODE, publicKey); |
| displayBytes("Plaintext data:", PLAINTEXT); |
| byte[] data = cipher.doFinal(PLAINTEXT); |
| displayBytes("Encrypted data:", data); |
| |
| cipher.init(Cipher.DECRYPT_MODE, privateKey); |
| data = cipher.doFinal(data); |
| displayBytes("Decrypted data:", data); |
| } |
| |
| private static void displayBytes(String label, byte[] bytes) { |
| System.out.println(label + " [length=" + bytes.length + "]"); |
| for (byte b : bytes) { |
| System.out.print("0x" + Integer.toHexString(b & 0xFF) + " "); |
| } |
| System.out.println(); |
| } |
| } |