func main() { flag.Parse() if *version { fmt.Println(gogost.Version) return } h := gost34112012256.New() io.Copy(h, os.Stdin) fmt.Println(hex.EncodeToString(h.Sum(nil))) }
// RFC 7836 VKO GOST R 34.10-2012 256-bit key agreement function. // UKM is user keying material, also called VKO-factor. func (prv *PrivateKey) KEK2012256(pub *PublicKey, ukm *big.Int) ([]byte, error) { if prv.mode != Mode2012 { return nil, errors.New("KEK2012 can not be used in Mode2001") } key, err := prv.KEK(pub, ukm) if err != nil { return nil, err } h := gost34112012256.New() h.Write(key) return h.Sum(key[:0]), nil }