GOST_KEY_TRANSPORT * make_rfc4490_keytransport_2001(EVP_PKEY *pubk, BIGNUM *eph_key, const unsigned char *key, size_t keylen, unsigned char *ukm, size_t ukm_len); int decrypt_rfc4490_shared_key_2001(EVP_PKEY *priv, GOST_KEY_TRANSPORT *gkt, unsigned char *key_buf, int key_buf_len) ;