Java example source code file (TestAESBase.java)

This example Java source code file (TestAESBase.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, algorithmparameters, cbc, cipher, crypto, des, exception, ivparameterspec, pkcs5padding, random, secretkeyspec, security, string, sunjce, testaesbase, util

The TestAESBase.java Java example source code

/*
 * Copyright (c) 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.
 *
 */

/**
 * @author Tom Deneau
 */

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.AlgorithmParameters;

import java.util.Random;
import java.util.Arrays;

abstract public class TestAESBase {
  int msgSize = Integer.getInteger("msgSize", 646);
  boolean checkOutput = Boolean.getBoolean("checkOutput");
  boolean noReinit = Boolean.getBoolean("noReinit");
  int keySize = Integer.getInteger("keySize", 128);
  String algorithm = System.getProperty("algorithm", "AES");
  String mode = System.getProperty("mode", "CBC");
  byte[] input;
  byte[] encode;
  byte[] expectedEncode;
  byte[] decode;
  byte[] expectedDecode;
  Random random = new Random(0);
  Cipher cipher;
  Cipher dCipher;
  String paddingStr = "PKCS5Padding";
  AlgorithmParameters algParams;
  SecretKey key;

  static int numThreads = 0;
  int  threadId;
  static synchronized int getThreadId() {
    int id = numThreads;
    numThreads++;
    return id;
  }

  abstract public void run();

  public void prepare() {
    try {
    System.out.println("\nalgorithm=" + algorithm + ", mode=" + mode + ", msgSize=" + msgSize + ", keySize=" + keySize + ", noReinit=" + noReinit + ", checkOutput=" + checkOutput);

      int keyLenBytes = (keySize == 0 ? 16 : keySize/8);
      byte keyBytes[] = new byte[keyLenBytes];
      if (keySize == 128)
        keyBytes = new byte[] {-8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7};
      else
        random.nextBytes(keyBytes);

      key = new SecretKeySpec(keyBytes, algorithm);
      if (threadId == 0) {
        System.out.println("Algorithm: " + key.getAlgorithm() + "("
                           + key.getEncoded().length * 8 + "bit)");
      }
      input = new byte[msgSize];
      for (int i=0; i<input.length; i++) {
        input[i] = (byte) (i & 0xff);
      }

      cipher = Cipher.getInstance(algorithm + "/" + mode + "/" + paddingStr, "SunJCE");
      dCipher = Cipher.getInstance(algorithm + "/" + mode + "/" + paddingStr, "SunJCE");

      if (mode.equals("CBC")) {
        int ivLen = (algorithm.equals("AES") ? 16 : algorithm.equals("DES") ? 8 : 0);
        IvParameterSpec initVector = new IvParameterSpec(new byte[ivLen]);
        cipher.init(Cipher.ENCRYPT_MODE, key, initVector);
      } else {
        algParams = cipher.getParameters();
        cipher.init(Cipher.ENCRYPT_MODE, key, algParams);
      }
      algParams = cipher.getParameters();
      dCipher.init(Cipher.DECRYPT_MODE, key, algParams);
      if (threadId == 0) {
        childShowCipher();
      }

      // do one encode and decode in preparation
      // this will also create the encode buffer and decode buffer
      encode = cipher.doFinal(input);
      decode = dCipher.doFinal(encode);
      if (checkOutput) {
        expectedEncode = (byte[]) encode.clone();
        expectedDecode = (byte[]) decode.clone();
        showArray(key.getEncoded()  ,  "key:    ");
        showArray(input,  "input:  ");
        showArray(encode, "encode: ");
        showArray(decode, "decode: ");
      }
    }
    catch (Exception e) {
      e.printStackTrace();
      System.exit(1);
    }
  }

  void showArray(byte b[], String name) {
    System.out.format("%s [%d]: ", name, b.length);
    for (int i=0; i<Math.min(b.length, 32); i++) {
      System.out.format("%02x ", b[i] & 0xff);
    }
    System.out.println();
  }

  void compareArrays(byte b[], byte exp[]) {
    if (b.length != exp.length) {
      System.out.format("different lengths for actual and expected output arrays\n");
      showArray(b, "test: ");
      showArray(exp, "exp : ");
      System.exit(1);
    }
    for (int i=0; i< exp.length; i++) {
      if (b[i] != exp[i]) {
        System.out.format("output error at index %d: got %02x, expected %02x\n", i, b[i] & 0xff, exp[i] & 0xff);
        showArray(b, "test: ");
        showArray(exp, "exp : ");
        System.exit(1);
      }
    }
  }


  void showCipher(Cipher c, String kind) {
    System.out.println(kind + " cipher provider: " + cipher.getProvider());
    System.out.println(kind + " cipher algorithm: " + cipher.getAlgorithm());
  }

  abstract void childShowCipher();
}