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{
  config,
  lib,
  pkgs,
  ...
}:
with lib;
let
  cfg = config.nixfiles.modules.gnupg;
in
{
  options.nixfiles.modules.gnupg = {
    enable = mkEnableOption "GnuPG";
    pinentry = mkOption {
      description = "Name of a pinentry implementation.";
      type = types.package;
      default = pkgs.pinentry-curses;
    };
  };

  config = mkIf cfg.enable {
    hm = {
      programs.gpg = {
        enable = true;

        homedir = "${config.dirs.data}/gnupg";

        settings =
          {
            display-charset = "utf-8";
            enable-progress-filter = true;
            fixed-list-mode = true;
            keyid-format = "0xlong";
            no-comments = true;
            no-emit-version = true;
            no-greeting = true;
            with-fingerprint = true;
            throw-keyids = false;

            use-agent = true;

            armor = true;

            no-random-seed-file = true;

            list-options = "show-uid-validity";
            verify-options = "show-uid-validity";
          }
          // (
            let
              cipherAlgos = [
                "AES256"
                "AES192"
                "AES"
              ];
              digestAlgos = [
                "SHA512"
                "SHA384"
                "SHA256"
                "SHA224"
              ];
              compressionAlgos = [
                "ZLIB"
                "BZIP2"
                "ZIP"
                "Uncompressed"
              ];

              cs = concatStringsSep " ";
            in
            {
              default-preference-list = cs (cipherAlgos ++ digestAlgos ++ compressionAlgos);

              personal-cipher-preferences = cs cipherAlgos;
              personal-digest-preferences = cs digestAlgos;
              personal-compress-preferences = cs compressionAlgos;

              s2k-cipher-algo = head cipherAlgos;
              s2k-digest-algo = head digestAlgos;

              digest-algo = head digestAlgos;
              cert-digest-algo = head digestAlgos;
            }
          );
      };

      services.gpg-agent = {
        enable = true;

        enableSshSupport = true;
        enableScDaemon = false;

        defaultCacheTtl = 999999;
        defaultCacheTtlSsh = 999999;
        maxCacheTtl = 999999;
        maxCacheTtlSsh = 999999;

        grabKeyboardAndMouse = true;

        sshKeys = [ my.pgp.grip ];

        pinentryPackage = cfg.pinentry;
      };
    };
  };
}

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