{stdenv, python27Packages}: python27Packages.buildPythonPackage rec {
  pname = "asn1crypto";
  version = "0.22.0";
  format = "setuptools";

  src = python27Packages.fetchPypi {
    inherit pname version;
    extension = "tar.gz";
    hash = "sha256-y7rdZA0xZasksG7yXR3KCaNEFhGsFfamtFJHT98K7Ro=";
  };

  propagatedBuildInputs = [python27Packages.setuptools];
}