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/>.
17 package gost34112012256
28 func NewKDF(key []byte) *KDF {
29 return &KDF{hmac.New(New, key)}
32 func (kdf *KDF) Derive(dst, label, seed []byte) (r []byte) {
33 kdf.h.Write([]byte{0x01})
35 kdf.h.Write([]byte{0x00})
37 kdf.h.Write([]byte{0x01})
38 kdf.h.Write([]byte{0x00})