75 lines
2.5 KiB
Java
75 lines
2.5 KiB
Java
/*
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* Copyright 2006-2007 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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/**
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* @see RSAEncryptDecrypt.sh
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*/
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import javax.crypto.Cipher;
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import java.security.GeneralSecurityException;
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import java.security.KeyPairGenerator;
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import java.security.KeyPair;
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import java.security.Key;
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public class RSAEncryptDecrypt {
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public static final byte[] PLAINTEXT = {1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6};
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public static void main(String[] args) throws Exception {
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KeyPairGenerator generator =
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KeyPairGenerator.getInstance("RSA", "SunMSCAPI");
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KeyPair keyPair = generator.generateKeyPair();
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Key publicKey = keyPair.getPublic();
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Key privateKey = keyPair.getPrivate();
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Cipher cipher = null;
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try {
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cipher = Cipher.getInstance("RSA", "SunMSCAPI");
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} catch (GeneralSecurityException e) {
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System.out.println("Cipher not supported by provider, skipping...");
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return;
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}
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cipher.init(Cipher.ENCRYPT_MODE, publicKey);
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displayBytes("Plaintext data:", PLAINTEXT);
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byte[] data = cipher.doFinal(PLAINTEXT);
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displayBytes("Encrypted data:", data);
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cipher.init(Cipher.DECRYPT_MODE, privateKey);
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data = cipher.doFinal(data);
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displayBytes("Decrypted data:", data);
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}
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private static void displayBytes(String label, byte[] bytes) {
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System.out.println(label + " [length=" + bytes.length + "]");
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for (byte b : bytes) {
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System.out.print("0x" + Integer.toHexString(b & 0xFF) + " ");
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}
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System.out.println();
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}
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}
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