X509_get_signature_nid
int sig_nid = X509_get_signature_nid(other);
OBJ_nid2ln(X509_get_signature_nid(cert)));
OBJ_nid2ln(X509_get_signature_nid(cert)));
sign_nid = X509_get_signature_nid(x);
rv = check_suite_b(pk, X509_get_signature_nid(x), &tflags);
i = X509_get_signature_nid(x);
if (!OBJ_find_sigid_algs(X509_get_signature_nid(cert), &mdnid, &pknid)) {
int X509_get_signature_nid(const X509 *x);
sig_nid = X509_get_signature_nid(x);