{
  config,
  nixosConfig,
  sysLib,
  pkgs,
  ...
}: let
  agent-program = sysLib.writeShellScriptWithLibrary {
    name = "onlykey-gpg-agent";
    src = ./agent-program;
    dependencies = with pkgs; [
      python3
      onlykey-agent
    ];
  };
  settings =
    if nixosConfig.networking.hostName == "isimud"
    then {}
    else {
      # Hardware-based GPG configuration
      agent-program = "${agent-program}/bin/onlykey-gpg-agent";

      default-key = "Soispha <soispha@vhack.eu>";
      # TODO add more
    };
  gpg-agent =
    if nixosConfig.networking.hostName == "isimud"
    then {
      enable = true;
      enableZshIntegration = true;
      enableScDaemon = true; # smartcards and such things
      pinentryFlavor = "tty";
    }
    else {
      enable = false;
      enableZshIntegration = true;
      enableScDaemon = true; # smartcards and such things
      pinentryFlavor = "tty";
    };
in {
  programs.gpg = {
    enable = true;
    homedir = "${config.xdg.dataHome}/gnupg/onlykey";
    mutableKeys = false;
    mutableTrust = false;
    inherit settings;
    publicKeys = [
      {
        source = ./keys/key_1;
        trust = "ultimate";
      }
      {
        source = ./keys/key_2;
        trust = "ultimate";
      }
      {
        source = ./keys/key_3;
        trust = "full";
      }
    ];
  };
  services = {
    inherit gpg-agent;
  };
}