[Web Security] Create a hash salt password which can stored in DB

We cannot directly store user password in the database.

What need to do is creating a hashed & salted string which reperstanting the user password.

This password is not reverable. And very hard for hacker to guess what is the origial password by using Dictionary Attacks.

var crypto = require('crypto');

var password = "monkey";

// randomBytes: generate a salt pre user, salt should be stored with hashed password in the database
crypto.randomBytes(, function(err, salt) {

  // pbkdf2: combine the salt the hash password algorithm, to generate a safe password
  crypto.pbkdf2(password, salt, , , 'sha256',
    function(err, hash) {

      console.log("The result of hashing " + password + " is:\n\n" +
        hash.toString('hex') + "\n\n");

    });

});