/*

 * 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();

}