const char *ec_curve_nid2name(int nid);
int ec_curve_name2nid(const char *name);
const unsigned char *ecdsa_algorithmidentifier_encoding(int md_nid, size_t *len);
const char *ec_curve_nid2name(int nid);
int ec_curve_name2nid(const char *name);
const unsigned char *ecdsa_algorithmidentifier_encoding(int md_nid, size_t *len);