AES encryption using JAVA and JavaFX for GUI

Controller.java

package sample;

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.TextField;

import javax.crypto.BadPaddingException;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

public class Controller {

    Encryptor encryptor = new Encryptor();

    @FXML
    private TextField keyTextField;

    @FXML
    private TextField inputTextField;

    @FXML
    private TextField outputTextField;

    @FXML
    void decryptButton(ActionEvent event) throws NoSuchPaddingException, InvalidKeyException, NoSuchAlgorithmException, IllegalBlockSizeException, BadPaddingException, InvalidAlgorithmParameterException {
        // Could be 128, 192, or 256 bits.
        byte[] key = encryptor.stringToByteArray(keyTextField.getText());
        String input = inputTextField.getText();
        String encryptedString = encryptor.decrypt(input,key);
        outputTextField.setText(encryptedString);
    }


    @FXML
    void encryptButton(ActionEvent event) throws NoSuchPaddingException, InvalidKeyException, NoSuchAlgorithmException, IllegalBlockSizeException, BadPaddingException, InvalidAlgorithmParameterException {
        //Could be 128, 192, or 256 bits.
        byte[] key = encryptor.stringToByteArray(keyTextField.getText());
        String input = inputTextField.getText();

        String encryptedString = encryptor.encrypt(input,key);
        outputTextField.setText(encryptedString);
    }

}

Encryptor.java

package sample;

import javax.crypto.*;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;

public class Encryptor {

    //Advanced Encryption Standard
    //128 bit
    static byte[] IV = { 0x01, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f };

    public String encrypt(String input, byte[] secretKey) throws NoSuchPaddingException, NoSuchAlgorithmException,
            InvalidAlgorithmParameterException, InvalidKeyException,
            BadPaddingException, IllegalBlockSizeException {

        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        SecretKeySpec key = new SecretKeySpec(secretKey,"AES");
        cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(IV));
        byte[] cipherText = cipher.doFinal(input.getBytes());
        return Base64.getEncoder()
                .encodeToString(cipherText);
    }


    public String decrypt(String cipherText, byte[] secretKey) throws NoSuchPaddingException, NoSuchAlgorithmException,
            InvalidAlgorithmParameterException, InvalidKeyException,
            BadPaddingException, IllegalBlockSizeException {

        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        SecretKeySpec key = new SecretKeySpec(secretKey,"AES");
        cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(IV));
        byte[] plainText = cipher.doFinal(Base64.getDecoder()
                .decode(cipherText));
        return new String(plainText);
    }

    public byte[] stringToByteArray(String keyString){
        String[] keyFragments = keyString.split(" ");

        byte[] key = new byte[16];
        for (int i = 0; i < keyFragments.length; i++) {
            key[i] = Byte.parseByte(keyFragments[i]);
        }
        return key;
    }

    public static void main(String[] args) throws NoSuchPaddingException, InvalidKeyException, NoSuchAlgorithmException, IllegalBlockSizeException, BadPaddingException, InvalidAlgorithmParameterException {
        Encryptor encryptor = new Encryptor();

        //128 bit
        byte[] encryptionKey = {65, 12, 12, 12, 12, 12, 12, 12, 12,
                12, 12, 12, 12, 12, 12, 12 };

        String stringKey = "65 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12";


        byte[] key = encryptor.stringToByteArray(stringKey);

        String input = "Secret";

        System.out.println(encryptor.encrypt(input,key));
        //output: VyEcl0pLeqQLemGONcik0w==

        System.out.println(encryptor.decrypt("VyEcl0pLeqQLemGONcik0w==",key));
    }
}

Main.java

package sample;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
        primaryStage.setTitle("Hello World");
        primaryStage.setScene(new Scene(root));
        primaryStage.show();
    }


    public static void main(String[] args) {
        launch(args);
    }
}

sample.FXML

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.VBox?>
<?import javafx.scene.text.Text?>

<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" style="-fx-background-color: #EAF4D3;" xmlns="http://javafx.com/javafx/15.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
   <children>
      <VBox layoutX="111.0" layoutY="123.0" prefHeight="154.0" prefWidth="379.0" spacing="25.0">
         <children>
            <Button mnemonicParsing="false" onAction="#encryptButton" prefHeight="33.0" prefWidth="398.0" text="Encrypt">
               <graphic>
                  <TextField fx:id="keyTextField" prefHeight="25.0" prefWidth="310.0" promptText="Key" text="65 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12" />
               </graphic>
            </Button>
            <Button mnemonicParsing="false" onAction="#decryptButton" prefHeight="33.0" prefWidth="394.0" text="Decrypt">
               <graphic>
                  <TextField fx:id="inputTextField" prefHeight="25.0" prefWidth="310.0" promptText="Input" />
               </graphic>
            </Button>
            <TextField fx:id="outputTextField" editable="false" promptText="Output" />
         </children>
      </VBox>
      <Text layoutX="110.0" layoutY="112.0" strokeType="OUTSIDE" strokeWidth="0.0" text="Key" />
      <Text layoutX="110.0" layoutY="174.0" strokeType="OUTSIDE" strokeWidth="0.0" text="Input" />
      <Text layoutX="110.0" layoutY="231.0" strokeType="OUTSIDE" strokeWidth="0.0" text="Output" />
   </children>
</AnchorPane>