J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2006-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any 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 | } |