Fix gost28147.addmod with bigger than modulo values

[pygost.git] / pygost / gost28147.py

diff --git a/pygost/gost28147.py b/pygost/gost28147.py
index 9cb438e012cf11227ad87352e2c679b5236b5d63..3d6705dbd1a2f542e2d2c07982ee1c2be0df38ab 100644 (file)
--- a/pygost/gost28147.py
+++ b/pygost/gost28147.py
@@ -28,7 +28,7 @@ from pygost.gost3413 import pad_size
 from pygost.gost3413 import unpad2
 from pygost.utils import hexdec
 from pygost.utils import strxor
-from pygost.utils import xrange  # pylint: disable=redefined-builtin
+from pygost.utils import xrange
 
 
 KEYSIZE = 32
@@ -190,7 +190,7 @@ def addmod(x, y, mod=2 ** 32):
     """ Modulo adding of two integers
     """
     r = x + y
-    return r if r < mod else r - mod
+    return r if r < mod else r % mod
 
 
 def _shift11(x):