crypto

app.post('/', function (req, res) {
  if (!req.body.user || !req.body.pass) {  
    res.send('Username and password both required');
    return;
  }
  
  crypto.randomBytes(128, function (err, salt) {
    if (err) { throw err; }
    salt = new Buffer(salt).toString('hex');
    crypto.pbkdf2(req.body.pass, salt, 7000, 256, 
      function (err, hash) {
        if (err) { throw err; }
        userStore[req.body.user] = {salt : salt, 
          hash : (new Buffer(hash).toString('hex')) };
        res.send('Thanks for registering ' + req.body.user);
        console.log(userStore);
      });
  });
});