EVP_PKEY_set_int_param
if (!EVP_PKEY_set_int_param(eckey, OSSL_PKEY_PARAM_EC_INCLUDE_PUBLIC, 0)) {
if (!EVP_PKEY_set_int_param(eckey, OSSL_PKEY_PARAM_EC_INCLUDE_PUBLIC, 1)) {
int EVP_PKEY_set_int_param(EVP_PKEY *pkey, const char *key_name, int in);