{
  description = "Simple (insecure) implementation of RSA in C";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs =
    inputs@{ self, ... }:
    inputs.flake-utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = inputs.nixpkgs.legacyPackages.${system};
      in
      {
        packages.default = pkgs.stdenv.mkDerivation {
          name = "rsa";
          src = self;
          buildInputs = with pkgs; [
            gcc
            gnumake
          ];
          buildPhase = ''
            make build
          '';
          installPhase = ''
            mkdir -p $out/bin/
            cp -r rsa.o $out/bin/rsa
          '';
        };
        apps.default = inputs.flake-utils.lib.mkApp {
          drv = self.packages.${system}.default;
        };

      }
    );
}