iTextSharp.text.pdf.security.CrlVerifier.Verify C# (CSharp) Méthode

        public bool Verify(X509Crl crl, X509Certificate signCert, X509Certificate issuerCert, DateTime signDate)
        {
            if (crl == null || signDate == DateTime.MaxValue)
                return false;
            // We only check CRLs valid on the signing date for which the issuer matches
            if (crl.IssuerDN.Equals(signCert.IssuerDN)
                && signDate.CompareTo(crl.ThisUpdate) > 0 && signDate.CompareTo(crl.NextUpdate.Value) < 0) {
                // the signing certificate may not be revoked
                if (IsSignatureValid(crl, issuerCert) && crl.IsRevoked(signCert)) {
                    throw new VerificationException(signCert, String.Format("{0} The certificate has been revoked.", signCert));
                }
                return true;
            }
            return false;
        }

 public static int CheckRevocation(PdfPKCS7 pkcs7, X509Certificate signCert, X509Certificate issuerCert, DateTime date)
 {
     List<BasicOcspResp> ocsps = new List<BasicOcspResp>();
     if (pkcs7.Ocsp != null)
         ocsps.Add(pkcs7.Ocsp);
     OcspVerifier ocspVerifier = new OcspVerifier(null, ocsps);
     List<VerificationOK> verification =
         ocspVerifier.Verify(signCert, issuerCert, date);
     if (verification.Count == 0)
     {
         List<X509Crl> crls = new List<X509Crl>();
         if (pkcs7.CRLs != null)
             foreach (X509Crl crl in pkcs7.CRLs)
                 crls.Add(crl);
         CrlVerifier crlVerifier = new CrlVerifier(null, crls);
         verification.AddRange(crlVerifier.Verify(signCert, issuerCert, date));
     }
     if (verification.Count == 0)
     {
         Console.WriteLine("No se pudo verificar estado de revocación del certificado por CRL ni OCSP");
         return CER_STATUS_NOT_VERIFIED;
     }
     else
     {
         foreach (VerificationOK v in verification)
             Console.WriteLine(v);
         return 0;
     }
 }