import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.spec.KeySpec;
import java.util.*;
import java.lang.*;
import java.io.*;
 
class Ideone {
  private static final String SECRET_KEY = "my_super_secret_key";
  private static final String SALT = "ssshhhhhhhhhhh!!!!";
 
  public static String encrypt(String strToEncrypt) {
    try {
      byte[] iv = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
      IvParameterSpec ivspec = new IvParameterSpec(iv);
 
      SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
      KeySpec spec = new PBEKeySpec(SECRET_KEY.toCharArray(), SALT.getBytes(), 65536, 256);
      SecretKey tmp = factory.generateSecret(spec);
      SecretKeySpec secretKey = new SecretKeySpec(tmp.getEncoded(), "AES");
 
      Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
      cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivspec);
      return Base64.getEncoder()
          .encodeToString(cipher.doFinal(strToEncrypt.getBytes(StandardCharsets.UTF_8)));
    } catch (Exception e) {
      System.out.println("Error while encrypting: " + e.toString());
    }
    return null;
  }
 
  public static String decrypt(String strToDecrypt) {
    try {
      byte[] iv = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
      IvParameterSpec ivspec = new IvParameterSpec(iv);
 
      SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
      KeySpec spec = new PBEKeySpec(SECRET_KEY.toCharArray(), SALT.getBytes(), 65536, 256);
      SecretKey tmp = factory.generateSecret(spec);
      SecretKeySpec secretKey = new SecretKeySpec(tmp.getEncoded(), "AES");
 
      Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
      cipher.init(Cipher.DECRYPT_MODE, secretKey, ivspec);
      return new String(cipher.doFinal(Base64.getDecoder().decode(strToDecrypt)));
    } catch (Exception e) {
      System.out.println("Error while decrypting: " + e.toString());
    }
    return null;
  }
 
  public static void main(String[] args) {
    String originalString = "howtodoinjava.com";
 
    String encryptedString = Ideone.encrypt(originalString);
    String decryptedString = Ideone.decrypt(encryptedString);
 
    System.out.println(originalString);
    System.out.println(encryptedString);
    System.out.println(decryptedString);
  }
 
}
 

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