X509_check_akid
ret = X509_check_akid(issuer, subject->akid);
if (X509_check_akid(x, x->akid) == X509_V_OK /* SKID matches AKID */
if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK) {
if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK) {
if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK) {
int X509_check_akid(const X509 *issuer, const AUTHORITY_KEYID *akid);