X509_get_ext_by_OBJ
LCRYPTO_USED(X509_get_ext_by_OBJ);
int X509_get_ext_by_OBJ(const X509 *x, const ASN1_OBJECT *obj,
LCRYPTO_ALIAS(X509_get_ext_by_OBJ);
idx = X509_get_ext_by_OBJ(x, obj, -1);
idx = X509_get_ext_by_OBJ(x, obj, -1);