X-Git-Url: http://www.git.cypherpunks.ru/?a=blobdiff_plain;f=pygost%2Fgost341194.py;h=da8623e61abba84e6e2e6871b76ecef632b4a165;hb=9af4461c6af50f9cf83030867e7054d1f6311b32;hp=6d58efd666de769c9358ff66b2bf5f0175681d23;hpb=d59175f7b4ae74bf32dee438fb64577140e0ac23;p=pygost.git

diff --git a/pygost/gost341194.py b/pygost/gost341194.py
index 6d58efd..da8623e 100644
--- a/pygost/gost341194.py
+++ b/pygost/gost341194.py
@@ -1,6 +1,6 @@
 # coding: utf-8
 # PyGOST -- Pure Python GOST cryptographic functions library
-# Copyright (C) 2015-2020 Sergey Matveev <stargrave@stargrave.org>
+# Copyright (C) 2015-2021 Sergey Matveev <stargrave@stargrave.org>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -13,7 +13,7 @@
 #
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
-""" GOST R 34.11-94 hash function
+"""GOST R 34.11-94 hash function
 
 This is implementation of :rfc:`5831`. Most function and variable names are
 taken according to specification's terminology.
@@ -23,7 +23,6 @@ from copy import copy
 from functools import partial
 from struct import pack
 
-from pygost.gost28147 import addmod
 from pygost.gost28147 import block2ns
 from pygost.gost28147 import encrypt
 from pygost.gost28147 import ns2block
@@ -59,7 +58,7 @@ def P(x):
 
 
 def _chi(Y):
-    """ Chi function
+    """Chi function
 
     This is some kind of LFSR.
     """
@@ -80,7 +79,7 @@ def _chi(Y):
 
 
 def _step(hin, m, sbox):
-    """ Step function
+    """Step function
 
     H_out = f(H_in, m)
     """
@@ -127,7 +126,7 @@ def _step(hin, m, sbox):
 
 
 class GOST341194(PEP247):
-    """ GOST 34.11-94 big-endian hash
+    """GOST 34.11-94 big-endian hash
 
     >>> m = GOST341194()
     >>> m.update("foo")
@@ -153,12 +152,12 @@ class GOST341194(PEP247):
         return GOST341194(copy(self.data), self.sbox)
 
     def update(self, data):
-        """ Append data that has to be hashed
+        """Append data that has to be hashed
         """
         self.data += data
 
     def digest(self):
-        """ Get hash of the provided data
+        """Get hash of the provided data
         """
         _len = 0
         checksum = 0
@@ -167,7 +166,7 @@ class GOST341194(PEP247):
         for i in xrange(0, len(m), BLOCKSIZE):
             part = m[i:i + BLOCKSIZE][::-1]
             _len += len(part) * 8
-            checksum = addmod(checksum, int(hexenc(part), 16), 2 ** 256)
+            checksum = (checksum + int(hexenc(part), 16)) % (2 ** 256)
             if len(part) < BLOCKSIZE:
                 part = b"\x00" * (BLOCKSIZE - len(part)) + part
             h = _step(h, part, self.sbox)