{ stdenv
, fetchurl
, pkgs
}:

let
  lua = pkgs.lua52Packages.lua;
in pkgs.lua52Packages.buildLuaPackage {
  name = "luaSha2";
  src = fetchurl {
    url = "https://luarocks.org/manifests/luarocks/sha2-0.2.0-1.src.rock";
    sha256 = "1h0mlkrr42acysxpdfk81rw695rdbr7b9khfjcxd5d4731irjs6j";
  };
  # src = fetchgit {
  #   url = "https://code.google.com/archive/p/sha2";
  #   rev = "02bd4bfdc8062c7e1ae51c5a72906efc0a6375ee";
  #   sha256 = "57ca5f1fb63b00aba7bcbb6e153a7878bc855a0cc6fb539abba33933da727c6f";
  # };
  buildInputs = with pkgs; [ unzip ];
  unpackPhase = ''
    unzip $src
    rm sha2-0.2.0-1.rockspec
    unzip sha2-0.2.0.zip
    rm sha2-0.2.0.zip
    mv -v sha2-0.2.0/* .
  '';
  buildPhase = ''
    gcc -L${lua}/lib -I$LUA_INC -I. sha2.c sha2lib.c -fPIC -DSHA2_USE_INTTYPES_H -DBYTE_ORDER -DLITTLE_ENDIAN -llua -shared -o sha2.so
  '';
  installPhase = ''
    mkdir -p $out/lib/lua/${lua.luaversion}
    install sha2.so $out/lib/lua/${lua.luaversion}
  '';
}