1 // GoGOST -- Pure Go GOST cryptographic functions library
2 // Copyright (C) 2015-2019 Sergey Matveev <stargrave@stargrave.org>
4 // This program is free software: you can redistribute it and/or modify
5 // it under the terms of the GNU General Public License as published by
6 // the Free Software Foundation, either version 3 of the License, or
7 // (at your option) any later version.
9 // This program is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
14 // You should have received a copy of the GNU General Public License
15 // along with this program. If not, see <http://www.gnu.org/licenses/>.
23 "cypherpunks.ru/gogost/gost28147"
24 "cypherpunks.ru/gogost/gost341194"
27 // RFC 4357 VKO GOST R 34.10-2001 key agreement function.
28 // UKM is user keying material, also called VKO-factor.
29 func (prv *PrivateKey) KEK2001(pub *PublicKey, ukm *big.Int) ([]byte, error) {
30 if prv.Mode != Mode2001 {
31 return nil, errors.New("KEK2001 can not be used in Mode2012")
33 key, err := prv.KEK(pub, ukm)
37 h := gost341194.New(&gost28147.SboxIdGostR341194CryptoProParamSet)
39 return h.Sum(key[:0]), nil