Android How to - Test AES encription

Question

We would like to know how to test AES encription.
Answer

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
/*  w w  w. ja v a  2s . c  o  m*/
public class Main {
  static String IV = "AAAAAAAAAAAAAAAA";
  static String plaintext = "test text 123\0\0\0";
  static String encryptionKey = "0123456789abcdef";

  public static void main(String[] args) {
    try {

      System.out.println("==Java==");
      System.out.println("plain:   " + plaintext);

      byte[] cipher = encrypt(plaintext, encryptionKey);

      System.out.print("cipher:  ");
      for (int i = 0; i < cipher.length; i++)
        System.out.print(new Integer(cipher[i]) + " ");
      System.out.println("");

      String decrypted = decrypt(cipher, encryptionKey);

      System.out.println("decrypt: " + decrypted);

    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  public static byte[] encrypt(String plainText, String encryptionKey)
      throws Exception {
    Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding", "SunJCE");
    SecretKeySpec key = new SecretKeySpec(encryptionKey.getBytes("UTF-8"),
        "AES");
    cipher.init(Cipher.ENCRYPT_MODE, key,
        new IvParameterSpec(IV.getBytes("UTF-8")));
    return cipher.doFinal(plainText.getBytes("UTF-8"));
  }

  public static String decrypt(byte[] cipherText, String encryptionKey)
      throws Exception {
    Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding", "SunJCE");
    SecretKeySpec key = new SecretKeySpec(encryptionKey.getBytes("UTF-8"),
        "AES");
    cipher.init(Cipher.DECRYPT_MODE, key,
        new IvParameterSpec(IV.getBytes("UTF-8")));
    return new String(cipher.doFinal(cipherText), "UTF-8");
  }
}