Java KeyGenerator for AES

import java.security.Key;
import java.util.Base64;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class Main {
   public static void main(String[] args) throws Exception {
      byte[] input = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d,
            0x0e, 0x0f, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 };
      byte[] ivBytes = new byte[] { 0x00, 0x00, 0x00, 0x01, 0x04, 0x05, 0x06, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x01 };/*from  w  ww  .  ja v a 2s.c o m*/

      Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding");
      KeyGenerator generator = KeyGenerator.getInstance("AES");

      generator.init(192);

      Key encryptionKey = generator.generateKey();

      System.out.println("key   : " + Base64.getEncoder().encodeToString(encryptionKey.getEncoded()));

      System.out.println("input : " + Base64.getEncoder().encodeToString(input));

      // encryption pass

      cipher.init(Cipher.ENCRYPT_MODE, encryptionKey, new IvParameterSpec(ivBytes));

      byte[] cipherText = new byte[cipher.getOutputSize(input.length)];

      int ctLength = cipher.update(input, 0, input.length, cipherText, 0);

      ctLength += cipher.doFinal(cipherText, ctLength);

      // decryption pass

      Key decryptionKey = new SecretKeySpec(encryptionKey.getEncoded(), encryptionKey.getAlgorithm());

      cipher.init(Cipher.DECRYPT_MODE, decryptionKey, new IvParameterSpec(ivBytes));

      byte[] plainText = new byte[cipher.getOutputSize(ctLength)];

      int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);

      ptLength += cipher.doFinal(plainText, ptLength);

      System.out.println("plain : " + Base64.getEncoder().encodeToString(plainText) + " bytes: " + ptLength);
   }
}