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