# 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
def kek(curve, prv, pub, ukm):
+ if not curve.contains(pub):
+ raise ValueError("pub is not on the curve")
key = curve.exp(prv, pub[0], pub[1])
key = curve.exp(curve.cofactor * ukm, key[0], key[1])
return pub_marshal(key)
def kek_34102001(curve, prv, pub, ukm):
- """ Key agreement (34.10-2001, 34.11-94)
+ """Key agreement (34.10-2001, 34.11-94)
:param GOST3410Curve curve: curve to use
:param long prv: private key
def kek_34102012256(curve, prv, pub, ukm=1):
- """ Key agreement (34.10-2012, 34.11-2012 256 bit)
+ """Key agreement (34.10-2012, 34.11-2012 256 bit)
:param GOST3410Curve curve: curve to use
:param long prv: private key
def kek_34102012512(curve, prv, pub, ukm=1):
- """ Key agreement (34.10-2012, 34.11-2012 512 bit)
+ """Key agreement (34.10-2012, 34.11-2012 512 bit)
:param GOST3410Curve curve: curve to use
:param long prv: private key