X509_check_issued
LCRYPTO_USED(X509_check_issued);
LCRYPTO_ALIAS(X509_check_issued);
return X509_check_issued(parent, child) == X509_V_OK;
!X509_check_issued(issuer_candidate, cert))
return X509_check_issued(issuer, subject) == X509_V_OK;
int X509_check_issued(X509 *issuer, X509 *subject);