OCSP_id_issuer_cmp
if (OCSP_id_issuer_cmp(ca_id, cid) == 0) {
ret = OCSP_id_issuer_cmp(a, b);
if (OCSP_id_issuer_cmp(cid, tmpid)) {
int OCSP_id_issuer_cmp(const OCSP_CERTID *a, const OCSP_CERTID *b);