Fix MGM tag_size usage

[pygost.git] / pygost / mgm.py

diff --git a/pygost/mgm.py b/pygost/mgm.py
index 49c478dc2619b5a00bc40de3e5c3dc5f4294453f..aabce95bbd04ad9504505352350cee8cff53179b 100644 (file)
--- a/pygost/mgm.py
+++ b/pygost/mgm.py
@@ -58,7 +58,7 @@ class MGM(object):
         """
         if bs not in (8, 16):
             raise ValueError("Only 64/128-bit blocksizes allowed")
-        self.tag_size = bs if tag_size is None else bs
+        self.tag_size = bs if tag_size is None else tag_size
         if self.tag_size < 4 or self.tag_size > bs:
             raise ValueError("Invalid tag_size")
         self.encrypter = encrypter