EC_FLAG_CHECK_NAMED_GROUP_NIST
{ EC_FLAG_CHECK_NAMED_GROUP_NIST, OSSL_PKEY_EC_GROUP_CHECK_NAMED_NIST },
(EC_FLAG_CHECK_NAMED_GROUP | EC_FLAG_CHECK_NAMED_GROUP_NIST)
ok = ok && EC_GROUP_check_named_curve(EC_KEY_get0_group(eck), (flags & EC_FLAG_CHECK_NAMED_GROUP_NIST) != 0, ctx) > 0;