Keybase AJAX Login

keybase_login.js

// Step One: Salt
$.ajax({
  async: true,
  type: 'GET',
  url: "https://keybase.io/_/api/1.0/getsalt.json",
  async: false,
  data: {"email_or_username": username},

  success: function(salt) {
    if(salt && salt.status && salt.status.name == "OK"){
      var scrypt = scrypt_module_factory(67108864);
      var pwh = scrypt.crypto_scrypt(scrypt.encode_utf8(user_passphrase),
                                      hex2bin(salt.salt),
                                      Math.pow(2,15), 8, 1, 224).slice(192, 224);

      var login_session = CryptoJS.enc.Base64.parse(salt.login_session);
      var parsed_pwh = CryptoJS.enc.u8array.parse(pwh);
      var hmac_pwh = CryptoJS.HmacSHA512(login_session, parsed_pwh);
      hmac_pwh = CryptoJS.enc.Hex.stringify(hmac_pwh);

      var login_data = {
        email_or_username: username,
        csrf_token: salt.csrf_token,
        hmac_pwh: hmac_pwh,
        login_session: salt.login_session
      };

      // Step Two: Login                                                             
      $.ajax({
        async: false,
        type: 'POST',
        url: "https://keybase.io/_/api/1.0/login.json",
        data: login_data,
        dataType: "json",
        success: function(login) {
          console.log(login);
          if(login && login.status && login.status.name == "OK"){
            console.log("successful login");
          }else{
            console.log("failed login: " + login.status.name);
          }
        },
        error: function (request, status, err) {
          console.log(err + status);
        }
      });
    }else{
      console.log("failed salt");
    }
  },
  error: function (request, status, err) {
    console.log(err + status);
  }
});