Password hashing for node.js

password.js

var crypto = require('crypto');

var SaltLength = 9;

function createHash(password) {
  var salt = generateSalt(SaltLength);
  var hash = md5(password + salt);
  return salt + hash;
}

function validateHash(hash, password) {
  var salt = hash.substr(0, SaltLength);
  var validHash = salt + md5(password + salt);
  return hash === validHash;
}

function generateSalt(len) {
  var set = '0123456789abcdefghijklmnopqurstuvwxyzABCDEFGHIJKLMNOPQURSTUVWXYZ',
      setLen = set.length,
      salt = '';
  for (var i = 0; i < len; i++) {
    var p = Math.floor(Math.random() * setLen);
    salt += set[p];
  }
  return salt;
}

function md5(string) {
  return crypto.createHash('md5').update(string).digest('hex');
}

module.exports = {
  'hash': createHash,
  'validate': validateHash
};

Anyone who uses this code is only introducing vulnerabilities into their application. The secure way to hash passwords today is by using pbkdf2 (like dak suggest) and never ever md5!

Learn how to hash password using PBKDF2:
http://nodejs.org/api/crypto.html#crypto_crypto_pbkdf2_password_salt_iterations_keylen_callback

Thanks so much