code: public X509CRLEntry getRevokedCertificate(X509Certificate cert) {
          if (revokedMap.isEmpty()) {
              return null;
          }
          X509IssuerSerial issuerSerial = new X509IssuerSerial(cert);
          return revokedMap.get(issuerSerial);
      }
docs: Gets the CRL entry for the given certificate.