1 // GoGOST -- Pure Go GOST cryptographic functions library
2 // Copyright (C) 2015-2020 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, version 3 of the License.
8 // This program is distributed in the hope that it will be useful,
9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 // GNU General Public License for more details.
13 // You should have received a copy of the GNU General Public License
14 // along with this program. If not, see <http://www.gnu.org/licenses/>.
21 "go.cypherpunks.ru/gogost/v4/gost34112012256"
22 "go.cypherpunks.ru/gogost/v4/gost34112012512"
25 // RFC 7836 VKO GOST R 34.10-2012 256-bit key agreement function.
26 // UKM is user keying material, also called VKO-factor.
27 func (prv *PrivateKey) KEK2012256(pub *PublicKey, ukm *big.Int) ([]byte, error) {
28 key, err := prv.KEK(pub, ukm)
32 h := gost34112012256.New()
34 return h.Sum(key[:0]), nil
37 // RFC 7836 VKO GOST R 34.10-2012 512-bit key agreement function.
38 // UKM is user keying material, also called VKO-factor.
39 func (prv *PrivateKey) KEK2012512(pub *PublicKey, ukm *big.Int) ([]byte, error) {
40 key, err := prv.KEK(pub, ukm)
44 h := gost34112012512.New()
46 return h.Sum(key[:0]), nil