/*
* 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
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* 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();
}
}