Java example source code file (TestISO10126Padding.java)

This example Java source code file (TestISO10126Padding.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

aes, aes\/ecb, algo, cipher, crypto, exception, keygenerator, keysize, nopadding, secretkey, security, string, sunjce, testiso10126padding, trans, util

The TestISO10126Padding.java Java example source code

/*
 * Copyright (c) 2003, 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.
 */

/*
 * @test
 * @bug 4921443
 * @summary Ensure ISO10126Padding works correctly.
 * @author Valerie Peng
 */
import java.util.Arrays;
import java.security.*;
import java.security.spec.*;

import javax.crypto.*;
import javax.crypto.spec.*;
import java.security.Provider;
import com.sun.crypto.provider.*;

public class TestISO10126Padding {
    private static final String ALGO = "AES";
    private static final String TRANS = "AES/ECB";
    private static final int KEYSIZE = 16; // in bytes

    private SecretKey key;

    private TestISO10126Padding() throws Exception {
        // setup
        KeyGenerator kg = KeyGenerator.getInstance(ALGO, "SunJCE");
        kg.init(KEYSIZE*8);
        key = kg.generateKey();
    }

    private void runTest(int dataLength) throws Exception {
        // setup
        byte[] data = new byte[dataLength];
        new SecureRandom().nextBytes(data);
        System.out.println("Testing data length: " + dataLength);

        // TEST#1 --
        // generate the cipher text using manually-supplied
        // XML Encryption padding
        Cipher ci = Cipher.getInstance(TRANS + "/NoPadding", "SunJCE");
        ci.init(Cipher.ENCRYPT_MODE, key);
        byte[] paddedData = new byte[ci.getBlockSize()];
        System.arraycopy(data, 0, paddedData, 0, data.length);
        int padValue = paddedData.length - data.length;
        paddedData[paddedData.length-1] = (byte) padValue;
        byte[] cipherText = ci.doFinal(paddedData);

        // decrypt using ISO10126Padding
        ci = Cipher.getInstance(TRANS + "/ISO10126Padding", "SunJCE");
        ci.init(Cipher.DECRYPT_MODE, key);
        byte[] recovered = ci.doFinal(cipherText);
        if (!Arrays.equals(data, recovered)) {
            throw new Exception("TEST#1: decryption failed");
        }
        // TEST#2 --
        // generate the cipher text using ISO10126Padding
        ci = Cipher.getInstance(TRANS + "/ISO10126Padding", "SunJCE");
        ci.init(Cipher.ENCRYPT_MODE, key);
        cipherText = ci.doFinal(data);

        // decrypt using ISO10126Padding
        ci.init(Cipher.DECRYPT_MODE, key);
        recovered = ci.doFinal(cipherText);
        if (!Arrays.equals(data, recovered)) {
            throw new Exception("TEST#2: decryption failed");
        }
    }

    public static void main(String[] argv) throws Exception {
        TestISO10126Padding test = new TestISO10126Padding();
        for (int i = 0; i<16; i++) {
            test.runTest(i);
        }
        System.out.println("Test Passed");
    }
}