package otpserver.simple;
 
 
import java.awt.event.ActionEvent;
import java.security.MessageDigest;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Base64;
import java.util.Random;
 
import javax.xml.bind.DatatypeConverter;
 
import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.Scene;
import javafx.scene.layout.*;
import javafx.scene.text.Text;
import javafx.scene.control.*;
 
import javafx.stage.Stage;
 
public class CounterApp extends Application {
 
 
    private final Text text = new Text();
    private final Text codigoSecreto = new Text();
    private final Button boton = new Button("muestra secreto");
    private String secreto= "";
    private boolean muestra = false;
    private void incrementCount() {
         try {
 
        	long a = System.currentTimeMillis()/(1000*60);
        	MessageDigest instance = MessageDigest.getInstance("MD5");
			instance.update((secreto +a).getBytes());
        	byte[] digest = instance.digest();
        	String token = DatatypeConverter.printHexBinary(digest).toUpperCase();
     		text.setText(  LocalDateTime.now() +"\n"+ token.substring(0, 5) );
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
 
    }
 
    @Override
    public void start(Stage primaryStage) {
 
    	Random random = new Random();
 
    	for (int c = 0;c<4;c++) {
    		secreto+=random.nextInt(9);
    	}
 
 
        VBox root = new VBox();
 
        root.getChildren().add(boton);
        root.getChildren().add(codigoSecreto);
 
        root.getChildren().add(text);
 
 
        Scene scene = new Scene(root, 200, 200);
 
        // longrunning operation runs on different thread
        Thread thread = new Thread(new Runnable() {
 
            @Override
            public void run() {
                Runnable updater = new Runnable() {
 
                    @Override
                    public void run() {
                        incrementCount();
                    }
                };
 
                while (true) {
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException ex) {
                    }
 
                    // UI update is run on the Application thread
                    Platform.runLater(updater);
                }
            }
 
        });
        // don't let thread prevent JVM shutdown
        thread.setDaemon(true);
        thread.start();
 
        boton.setOnAction(p->{
        	muestra=!muestra; 
        	if(muestra)
        		codigoSecreto.setText(secreto);
        	else
        		codigoSecreto.setText("*****");
        });
        primaryStage.setTitle("Token Digital");
        primaryStage.setScene(scene);
        primaryStage.show();
    }
 
    public static void main(String[] args) {
        launch(args);
    }
 
}
 

package otpserver.simple;
 
import java.awt.event.ActionEvent;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Base64;
import java.util.Optional;
import java.util.Random;
 
import javax.swing.JOptionPane;
import javax.xml.bind.DatatypeConverter;
 
import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.Scene;
import javafx.scene.layout.*;
import javafx.scene.text.Text;
import javafx.scene.control.*;
 
import javafx.stage.Stage;
 
 
public class Login extends Application {
 
	private final TextField usuario = new TextField();
	private final PasswordField clave = new PasswordField();
	private final TextField token = new TextField();
 
	private final Button boton = new Button("login");
 
	private boolean tieneToken = false;
	private String secretotoken = "";
 
	@Override
	public void start(Stage primaryStage) {
 
		usuario.setPromptText("usuario");
		token.setPromptText("token");
		token.setVisible(false);
		VBox root = new VBox();
 
		root.getChildren().add(usuario);
 
		root.getChildren().add(clave);
 
		root.getChildren().add(token);
 
		root.getChildren().add(boton);
 
		Scene scene = new Scene(root, 200, 200);
 
		// longrunning operation runs on different thread
 
		boton.setOnAction(p -> {
 
			if (usuario.getText().equals("admin") && clave.getText().equals("admin") && !tieneToken) {
				System.out.println("xd");
				TextInputDialog dialog = new TextInputDialog();
				dialog.setTitle("parear");
				dialog.setHeaderText("parear");
 
				// Traditional way to get the response value.
				Optional<String> result = dialog.showAndWait();
				if (result.isPresent()) {
					tieneToken = true;
					token.setVisible(tieneToken);
 
				}
 
				// The Java 8 way to get the response value (with lambda expression).
				result.ifPresent(name -> {
					secretotoken=name;
				});
			}
 
			if (usuario.getText().equals("admin") && clave.getText().equals("admin") && tieneToken) {
				 try {
 
			        	long a = System.currentTimeMillis()/(1000*60);
			        	MessageDigest instance = MessageDigest.getInstance("MD5");
						instance.update((secretotoken +a).getBytes());
			        	byte[] digest = instance.digest();
			        	String tokenProvar = DatatypeConverter.printHexBinary(digest).toUpperCase();
			        	System.out.println("tokenProvar "+tokenProvar);
			        	if(token.getText().equals(tokenProvar.substring(0,5))) {
			        		JOptionPane.showMessageDialog(null, "exito");
			        	}else {
			        		JOptionPane.showMessageDialog(null, "eres falla");
			        	}
					} catch (Exception e) {
						throw new RuntimeException(e);
					}
			}
 
		});
		primaryStage.setTitle("Login");
		primaryStage.setScene(scene);
		primaryStage.show();
	}
 
	public static void main(String[] args) {
		launch(args);
	}
 
}