src/secmod_eddsa.ml

@@ -20,6 +20,8 @@ type t = {
   mutable keys: key list;
 }
 
+(* -- util -- *)
+
 let time_abs_of_string s =
   match int_of_string_opt s with
   | None -> None
@@ -27,7 +29,8 @@ let time_abs_of_string s =
       let ts = Absolute.of_s (Int64.of_int n) in
       Some ts
 
-let t1_t2_of_filename fname =
+let t1_t2_of_fpath fpath =
+  let fname = Fpath.filename fpath in
   match String.split_on_char '-' fname with
   | [] -> Fmt.failwith "not possible"
   | [ t1; t2 ] -> (
@@ -44,22 +47,42 @@ let time_abs_to_string abs =
   |> Int64.to_int
   |> string_of_int
 
-let key_filename k =
+let key_fpath k =
   let t1 = time_abs_to_string k.t1 in
   let t2 = time_abs_to_string k.t2 in
-  Fmt.str "%s-%s" t1 t2
+  let fname = Fmt.str "%s-%s" t1 t2 in
+  Fpath.(v Cfg.key_dir / fname)
 
-let read_key fname =
-  let fpath = Fpath.(v Cfg.key_dir / fname) in
+(* -- IO -- *)
+
+let read_key fpath =
   let* data = Bos.OS.File.read fpath |> unwrap_err_msg in
   EddsaPrivateKey.of_octets data
 
-let write_eddsa fname priv =
-  let fpath = Fpath.(v Cfg.key_dir / fname) in
+let write_eddsa fpath priv =
   let data = EddsaPrivateKey.to_octets priv in
   Bos.OS.File.write fpath data |> unwrap_err_msg
 
-let write_key k = write_eddsa (key_filename k) k.priv
+let write_key k = write_eddsa (key_fpath k) k.priv
+
+let delete_key_file k =
+  let+ () =
+    Bos.OS.File.delete ~must_exist:true (key_fpath k) |> unwrap_err_msg
+  in
+  ()
+
+let get_key_dir_contents dir =
+  let* dir = Fpath.of_string dir |> unwrap_err_msg in
+  let* b = Bos.OS.Dir.create ~mode:0o700 dir |> unwrap_err_msg in
+  if b then
+    Logs.info (fun m -> m "secmod_eddsa: created directory `%a`" Fpath.pp dir);
+  let+ l =
+    Bos.OS.Dir.contents ~dotfiles:false ~rel:true dir |> unwrap_err_msg
+  in
+  l
+
+(* -- *)
+
 let sort_keys l = List.sort (fun a b -> Absolute.compare a.t2 b.t2) l
 
 let split_in_periodes ~start ~end_ =
@@ -101,31 +124,26 @@ let check_periodes _l =
 (* we load sm_key separately
    we don't accept non-key files in key_dir *)
 let load_key fpath =
-  let fname = Fpath.filename fpath in
-  match fname = Cfg.sm_priv_key with
+  match Fpath.filename fpath = Cfg.sm_priv_key with
   | true -> Ok None
   | false -> (
-      match t1_t2_of_filename fname with
-      | None -> Fmt.error "invalid filename `%s`" fname
+      match t1_t2_of_fpath fpath with
+      | None -> Fmt.error "invalid file `%a`" Fpath.pp fpath
       | Some (t1, t2) ->
-          let* priv = read_key fname in
+          let* priv = read_key fpath in
           let pub = EddsaPrivateKey.pub_of_priv priv in
           Ok (Some { priv; pub; t1; t2 }))
 
+let sm_key_fpath = Fpath.(v Cfg.key_dir / Cfg.sm_priv_key)
+
 let load () =
-  let dir = Fpath.v Cfg.key_dir in
-  let* b = Bos.OS.Dir.create ~mode:0o700 dir |> unwrap_err_msg in
-  if b then
-    Logs.info (fun m -> m "secmod_eddsa: created directory `%a`" Fpath.pp dir);
-  let* l =
-    Bos.OS.Dir.contents ~dotfiles:false ~rel:true dir |> unwrap_err_msg
-  in
+  let* l = get_key_dir_contents Cfg.key_dir in
   let* l = list_map load_key l in
   let keys = List.filter_map Fun.id l in
   match keys with
   | [] -> Ok None
   | _l ->
-      let* sm_key_priv = read_key Cfg.sm_priv_key in
+      let* sm_key_priv = read_key sm_key_fpath in
       let sm_key_pub = EddsaPrivateKey.pub_of_priv sm_key_priv in
       Ok (Some { sm_key_priv; sm_key_pub; keys })
 
@@ -136,7 +154,7 @@ let init () =
     | Some t -> Ok t
     | None ->
         let sm_key_priv, sm_key_pub = Mirage_crypto_ec.Ed25519.generate () in
-        let* () = write_eddsa Cfg.sm_priv_key sm_key_priv in
+        let* () = write_eddsa sm_key_fpath sm_key_priv in
         Ok { sm_key_priv; sm_key_pub; keys= [] }
   in
   let now = Absolute.of_ptime (Ptime_clock.now ()) in
@@ -171,11 +189,8 @@ let delete_key pub =
   let* k = find_key pub in
   let l = List.filter (fun k -> k.pub <> pub) t.keys in
   t.keys <- l;
-  (* rm file *)
-  let fname = key_filename k in
-  let fpath = Fpath.(v Cfg.key_dir / fname) in
-  let* () = Bos.OS.File.delete ~must_exist:true fpath |> unwrap_err_msg in
-  Ok ()
+  let+ () = delete_key_file k in
+  ()
 
 let delete_outdated ~now =
   t.keys