ec_key_st
struct ec_key_st *ec; /* ECC */
typedef struct ec_key_st EC_KEY;
struct ec_key_st;
int EVP_PKEY_set1_EC_KEY(EVP_PKEY *pkey, struct ec_key_st *key);
const struct ec_key_st *EVP_PKEY_get0_EC_KEY(const EVP_PKEY *pkey);
struct ec_key_st *EVP_PKEY_get1_EC_KEY(EVP_PKEY *pkey);
typedef struct ec_key_st EC_KEY;