// GoGOST -- Pure Go GOST cryptographic functions library
-// Copyright (C) 2015-2017 Sergey Matveev <stargrave@stargrave.org>
+// Copyright (C) 2015-2019 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
)
func (prv *PrivateKey) KEK(pub *PublicKey, ukm *big.Int) ([]byte, error) {
- keyX, keyY, err := prv.c.Exp(prv.key, pub.x, pub.y)
+ keyX, keyY, err := prv.C.Exp(prv.Key, pub.X, pub.Y)
if err != nil {
return nil, err
}
- keyX, keyY, err = prv.c.Exp(ukm, keyX, keyY)
- if err != nil {
- return nil, err
+ if ukm.Cmp(bigInt1) != 0 {
+ keyX, keyY, err = prv.C.Exp(ukm, keyX, keyY)
+ if err != nil {
+ return nil, err
+ }
}
- pk := PublicKey{prv.c, prv.mode, keyX, keyY}
+ pk := PublicKey{prv.C, prv.Mode, keyX, keyY}
return pk.Raw(), nil
}