here's my problem, I am working on a system where user can create an account, the user launches a program, he clicks on the register button. A new page appears and he has to enter his information(username, password). Then his information is stored into a local DB. The problem is when a user create his account his information is stored in DB but the password is a String so everyone can see what the password it is . I want to hash the password into my java program first then store it into DB. But I don't understand how to that because I use "Windows Builder" to do the interface, so the user enter his password in a JPasswordField. I don't know how to obtain the password that the user wrote, hash it, and send it to the DB.
For now I have a program where I can store the information I need, and I have a program where I can hash a word into different types of hash. I also use the salt method I saw it's better for the password, none of them will have the same hash code.
The code to store information :
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.JPasswordField;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.awt.event.ActionEvent;
public class Register extends JFrame {
private JPanel contentPane;
private JTextField txtUsername;
private JPasswordField pwdPassword;
private JPasswordField pwdConfpassword;
private JButton btnSubmit;
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Register frame = new Register();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public Register() {
super("Register");
conn = DatabaseConnection.connection();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JLabel lblUsername = new JLabel("Username");
lblUsername.setBounds(96, 68, 71, 14);
contentPane.add(lblUsername);
JLabel lblPassword = new JLabel("Password");
lblPassword.setBounds(96, 93, 80, 14);
contentPane.add(lblPassword);
JLabel lblconfPassword = new JLabel("Confirm password");
lblconfPassword.setBounds(97, 122, 91, 14);
contentPane.add(lblconfPassword);
txtUsername = new JTextField();
txtUsername.setBounds(204, 65, 86, 20);
contentPane.add(txtUsername);
txtUsername.setColumns(10);
pwdPassword = new JPasswordField();
pwdPassword.setBounds(201, 90, 89, 20);
contentPane.add(pwdPassword);
pwdConfpassword = new JPasswordField();
pwdConfpassword.setBounds(211, 119, 79, 20);
contentPane.add(pwdConfpassword);
btnSubmit = new JButton("Submit");
btnSubmit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
stmt = conn.createStatement();
String RegUsername = txtUsername.getText();
String RegPassword = pwdPassword.getText();
String sql = "INSERT INTO account(Username, Password) VALUES('"+RegUsername+"', '"+RegPassword+"')";
stmt.executeUpdate(sql);
JOptionPane.showMessageDialog(null,"Account created");
}catch(Exception e1) {
JOptionPane.showMessageDialog(null,e1);
}
}
});
btnSubmit.setBounds(78, 202, 89, 23);
contentPane.add(btnSubmit);
}
The code to hash password :
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
public class hash {
public static void main(String[] args) throws Exception {
String Password = "Maria";
String algorithm = "MD5";
byte[] salt = createSalt();
System.out.println("test : " +generateHash(Password, algorithm, salt));
}
private static String generateHash(String Password, String algorithm, byte[] salt) throws NoSuchAlgorithmException {
MessageDigest digest = MessageDigest.getInstance(algorithm);
digest.reset();
digest.update(salt);
byte[] hash = digest.digest(Password.getBytes());
return bytesToStringHex(hash);
}
private final static char[] hexArray = "0123456789ABCDEF".toCharArray();
public static String bytesToStringHex(byte[] bytes) {
char [] hexChars = new char[bytes.length * 2];
for (int j = 0; j < bytes.length;j++) {
int v = bytes[j] & 0xFF;
hexChars[j * 2] = hexArray[v >>>4];
hexChars[j * 2 + 1] = hexArray[v & 0x0F];
}
return new String(hexChars);
}
public static byte[] createSalt() {
byte[] bytes = new byte[20];
SecureRandom random = new SecureRandom();
random.nextBytes(bytes);
return bytes;
}
}
My goal is that the user can register and his password is stored in the DB but the password is hash following a certain type of hash and also he can log in with his account so the password can be decrypt and compare with the one encrypt.
Sincerely, Molka
