add secmod_denom.ml secmod_signkey.ml

src/secmod_signkey.ml

@@ -0,0 +1,44 @@
+(* TODO
+     - key rotation
+     - how many signkey to use?
+       we just use 1 for now *)
+open Syntax
+
+type t = {
+  sm_key: Signkey.t;
+  keys: Signkey.t list;
+}
+
+let dir = Fpath.(v "data" / "secmod_signkey")
+
+let store_secmod_data t =
+  let* () = Data_file.write_eddsa Fpath.(dir / "sm_key") t.sm_key.priv in
+  t.keys
+  |> List.mapi (fun i key ->
+      let fname = Fpath.(dir / string_of_int i) in
+      (fname, key.Signkey.priv))
+  |> list_iter (fun (fname, key) -> Data_file.write_eddsa fname key)
+
+let load conn =
+  let error_invalid_state =
+    Fmt.error_msg "secmod_signkey load error: invalid store state."
+  in
+  let* sm_key = Data_file.load_signkey conn Fpath.(dir / "sm_key") in
+  let* keys =
+    let l = List.init 1 (fun i -> Fpath.(dir / string_of_int i)) in
+    let* l =
+      Syntax.list_map (fun fname -> Data_file.load_signkey conn fname) l
+    in
+    match Syntax.opt_list l with
+    | Error () -> error_invalid_state
+    | Ok opt -> Ok opt
+  in
+  match (sm_key, keys) with
+  | None, None -> Ok None
+  | Some sm_key, Some keys -> Ok (Some { sm_key; keys })
+  | _, _ -> error_invalid_state
+
+let make_new () =
+  let sm_key = Signkey.make () in
+  let keys = [ Signkey.make () ] in
+  { sm_key; keys }