diff --git a/flake.nix b/flake.nix
index 2030274..a7e0939 100644
--- a/flake.nix
+++ b/flake.nix
@@ -100,9 +100,29 @@
                 }
               )
               self.nixosConfigurations);
-
+            argon2id =
+              let
+                python = pkgs.python3.withPackages (pp: with pp; [
+                  argon2-cffi
+                ]);
+              in
+              pkgs.writeTextFile {
+                name = "argon2id";
+                text = ''
+                  #!${python}/bin/python
+                  import getpass
+                  from argon2 import PasswordHasher
+                  pw = getpass.getpass()
+                  ph = PasswordHasher(
+                      time_cost=5,
+                      memory_cost=2*1024*1024, # in kibibytes
+                      parallelism=4,
+                  )
+                  print(ph.hash(pw))
+                '';
+                executable = true;
+              };
           });
-
       }) // {
       overlay = import ./pkgs;