Minecraft lastlogin decrypter

import java.io.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.util.*;
import javax.swing.JOptionPane;

public class Lastlogin {
    public static String user = "";
    public static String pass = "";

    public static void main(String[] args) {
        readUsername();
        JOptionPane.showMessageDialog(null, "Username: " + user + "\nPassword: " + pass, "Lastlogin", JOptionPane.INFORMATION_MESSAGE);
    }

    private static void readUsername() {
        try {
            File lastLogin = new File(System.getenv("APPDATA") + "\\.minecraft\\lastlogin");
            Cipher cipher = getCipher(2, "passwordfile");
            DataInputStream dis;

            if (cipher != null) dis = new DataInputStream(new CipherInputStream(new FileInputStream(lastLogin), cipher));
            else dis = new DataInputStream(new FileInputStream(lastLogin));

            user = dis.readUTF();
            pass = dis.readUTF();
            dis.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static Cipher getCipher(int mode, String password) throws Exception {
        Random random = new Random(43287234L);
        byte[] salt = new byte[8];
        random.nextBytes(salt);
        PBEParameterSpec pbeParamSpec = new PBEParameterSpec(salt, 5);

        SecretKey pbeKey = SecretKeyFactory.getInstance("PBEWithMD5AndDES").generateSecret(new PBEKeySpec(password.toCharArray()));
        Cipher cipher = Cipher.getInstance("PBEWithMD5AndDES");
        cipher.init(mode, pbeKey, pbeParamSpec);
        return cipher;
    }

}