Get salt for keybase

keybase_salt.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);
    }
  },
  error {
    console.log(err + status);
  }
});