Password Storage Example : MD5 Message Digest algorithm  « Security « Java Tutorial

1. Java Tutorial
2. Security
3. MD5 Message Digest algorithm

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.security.MessageDigest;
import java.security.SecureRandom;
import java.util.Arrays;

public class MainClass {
  public static void main(String[] args) throws Exception {
    createPassword("password");
  }

  private static void createPassword(String password) throws Exception {
    SecureRandom random = new SecureRandom();
    byte[] salt = new byte[12];
    random.nextBytes(salt);

    MessageDigest md = MessageDigest.getInstance("MD5");
    md.update(salt);
    md.update(password.getBytes("UTF8"));
    byte[] digest = md.digest();

    FileOutputStream fos = new FileOutputStream("password");
    fos.write(salt);
    fos.write(digest);
    fos.close();
  }

}