Check if certificate is included in CRL

Checking if a particular certificate is contained in a CRL (and, this way, revoked) is easy:

Load your CRL into a TElCertificateRevocationList object.
Load the certificate in question into a TElX509Certificate object as explained here.
Finally, pass the certificate to the CRL's IsPresent() method: bool certRevoked = crl.IsPresent(cert);