Java example source code file (PaddingTest.java)

This example Java source code file (PaddingTest.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

bufferedinputstream, bufferedoutputstream, crypto, desede, deskeyspec, ecb, exception, fileinputstream, fileoutputstream, ivparameterspec, nopadding, paddingtest, string, stringbuffer, sunjce, util

The PaddingTest.java Java example source code

/*
 * Copyright (c) 1997, 2012, 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 0000000 6296075 6330275
 * @summary PaddingTest
 * @author Jan Luehe
 */
import java.io.*;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.spec.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.util.Arrays;

public class PaddingTest {

    Cipher cipher;
    IvParameterSpec params = null;
    SecretKey cipherKey = null;
    String pinfile = null;
    String cfile = null;
    String poutfile = null;

    public static byte[] key = {
        (byte)0x01,(byte)0x23,(byte)0x45,(byte)0x67,
        (byte)0x89,(byte)0xab,(byte)0xcd,(byte)0xef
    };

    public static byte[] key3 = {
        (byte)0x01,(byte)0x23,(byte)0x45,(byte)0x67,
        (byte)0x89,(byte)0xab,(byte)0xcd,(byte)0xef,
        (byte)0xf0,(byte)0xe1,(byte)0xd2,(byte)0xc3,
        (byte)0xb4,(byte)0xa5,(byte)0x96,(byte)0x87,
        (byte)0xfe,(byte)0xdc,(byte)0xba,(byte)0x98,
        (byte)0x76,(byte)0x54,(byte)0x32,(byte)0x10};

    public static byte[] iv  = {
        (byte)0xfe,(byte)0xdc,(byte)0xba,(byte)0x98,
        (byte)0x76,(byte)0x54,(byte)0x32,(byte)0x10};

    static String[] crypts = {"DES", "DESede"};
    static String[] modes = {"ECB", "CBC", "CFB", "OFB", "PCBC"};
    static String[] paddings = {"PKCS5Padding", "NoPadding"};
    static int numFiles = 11;
    static final String currDir = System.getProperty("test.src", ".");
    static String dataDir = currDir + "/inputData/";

    private String padding = null;

    public static void main(String argv[]) throws Exception {
        PaddingTest pt = new PaddingTest();
        pt.run();
    }

    public PaddingTest() {
    }

    public void run() throws Exception {

        for (int l=0; l<numFiles; l++) {
            pinfile = dataDir + "plain" + l + ".txt";
            for (int i=0; i<crypts.length; i++) {
                for (int j=0; j<modes.length; j++) {
                    for (int k=0; k<paddings.length; k++) {
                        System.out.println
                            ("===============================");
                        System.out.println
                            (crypts[i]+" "+modes[j]+" " + paddings[k]+ " " +
                             "plain" + l + " test");
                        cfile = "c" + l + "_" +
                             crypts[i] + "_" +
                             modes[j] + "_" +
                             paddings[k] + ".bin";
                        poutfile = "p" + l +
                             "_" + crypts[i] + modes[j] + paddings[k] + ".txt";

                        init(crypts[i], modes[j], paddings[k]);
                        padding = paddings[k];
                        runTest();
                    }
                }
            }
        }
    }

    public void init(String crypt, String mode, String padding)
            throws Exception {

        KeySpec desKeySpec = null;
        SecretKeyFactory factory = null;

        StringBuffer cipherName = new StringBuffer(crypt);
        if (mode.length() != 0)
            cipherName.append("/" + mode);
        if (padding.length() != 0)
            cipherName.append("/" + padding);

        cipher = Cipher.getInstance(cipherName.toString());
        if (crypt.endsWith("ede")) {
            desKeySpec = new DESedeKeySpec(key3);
            factory = SecretKeyFactory.getInstance("DESede", "SunJCE");
        } else {
            desKeySpec = new DESKeySpec(key);
            factory = SecretKeyFactory.getInstance("DES", "SunJCE");
        }

        // retrieve the cipher key
        cipherKey = factory.generateSecret(desKeySpec);

        // retrieve iv
        if (!mode.equals("ECB"))
            params = new IvParameterSpec(iv);
        else
            params = null;
    }

    public void runTest() throws Exception {

        int bufferLen = 512;
        byte[] input = new byte[bufferLen];
        int len;
        int totalInputLen = 0;

        try {
            try (FileInputStream fin = new FileInputStream(pinfile);
                    BufferedInputStream pin = new BufferedInputStream(fin);
                    FileOutputStream fout = new FileOutputStream(cfile);
                    BufferedOutputStream cout = new BufferedOutputStream(fout)) {
                cipher.init(Cipher.ENCRYPT_MODE, cipherKey, params);

                while ((len = pin.read(input, 0, bufferLen)) > 0) {
                    totalInputLen += len;
                    byte[] output = cipher.update(input, 0, len);
                    cout.write(output, 0, output.length);
                }

                len = cipher.getOutputSize(0);

                byte[] out = new byte[len];
                len = cipher.doFinal(out, 0);
                cout.write(out, 0, len);
            }

            try (FileInputStream fin = new FileInputStream(cfile);
                    BufferedInputStream cin = new BufferedInputStream(fin);
                    FileOutputStream fout = new FileOutputStream(poutfile);
                    BufferedOutputStream pout = new BufferedOutputStream(fout)) {
                cipher.init(Cipher.DECRYPT_MODE, cipherKey, params);

                byte[] output = null;
                while ((len = cin.read(input, 0, bufferLen)) > 0) {
                    output = cipher.update(input, 0, len);
                    pout.write(output, 0, output.length);
                }

                len = cipher.getOutputSize(0);
                byte[] out = new byte[len];
                len = cipher.doFinal(out, 0);
                pout.write(out, 0, len);
            }

            diff(pinfile, poutfile);
        } catch (IllegalBlockSizeException ex) {
            if ((totalInputLen % 8 != 0) && (padding.equals("NoPadding"))) {
                return;
            } else {
                System.out.println("Test failed!");
                throw ex;
            }
        }
    }

    private static void diff(String fname1, String fname2) throws Exception {
        if (!Arrays.equals(Files.readAllBytes(Paths.get(fname1)),
                Files.readAllBytes(Paths.get(fname2)))) {
            throw new Exception(
                    "files " + fname1 + " and " + fname2 + " differ");
        }
    }
}