diff --git a/python/online/fxreader/pr34/commands_typed/crypto.py b/python/online/fxreader/pr34/commands_typed/crypto.py
index fb20856..ab3a8b6 100644
--- a/python/online/fxreader/pr34/commands_typed/crypto.py
+++ b/python/online/fxreader/pr34/commands_typed/crypto.py
@@ -1,7 +1,7 @@
 import base64
 import os
 
-from typing import (Literal, overload,)
+from typing import (Literal, overload, Optional,)
 
 class PasswordUtils:
   @overload
@@ -25,10 +25,12 @@ class PasswordUtils:
     cls,
     secret: str,
     mode: Literal['bytes', 'base64'],
+    salt: Optional[bytes] = None,
   ) -> tuple[str, str] | tuple[bytes, bytes]:
     from cryptography.hazmat.primitives.kdf.scrypt import Scrypt
 
-    salt = os.urandom(16)
+    if salt is None:
+      salt = os.urandom(16)
 
     # derive
     kdf = Scrypt(
diff --git a/python/online/fxreader/pr34/tests/test_crypto.py b/python/online/fxreader/pr34/tests/test_crypto.py
index f4da055..60e7881 100644
--- a/python/online/fxreader/pr34/tests/test_crypto.py
+++ b/python/online/fxreader/pr34/tests/test_crypto.py
@@ -3,7 +3,7 @@ import unittest
 
 
 class TestCrypto(unittest.TestCase):
-    def test_password_utils(self):
+    def test_password_utils(self) -> None:
         salt = b'asdfasdfasdf'
 
         self.assertEqual(