Opc.Ua.DirectoryCertificateStore.AddCRL C# (CSharp) Method

        public void AddCRL(X509CRL crl)
        {
            if (crl == null)
            {
                throw new ArgumentNullException("crl");
            }

            X509Certificate2 issuer = null;
            X509Certificate2Collection certificates = null;
            Task.Run( async () => certificates = await Enumerate()).Wait();
            foreach (X509Certificate2 certificate in certificates)
            {
                if (Utils.CompareDistinguishedName(certificate.Subject, crl.Issuer))
                {
                    if (crl.VerifySignature(certificate, false))
                    {
                        issuer = certificate;
                        break;
                    }
                }
            }

            if (issuer == null)
            {
                throw new ServiceResultException(StatusCodes.BadCertificateInvalid, "Could not find issuer of the CRL.");
            }

            StringBuilder builder = new StringBuilder();
            builder.Append(m_directory.FullName);
            
            builder.Append(Path.DirectorySeparatorChar + "crl" + Path.DirectorySeparatorChar);
            builder.Append(GetFileName(issuer));
            builder.Append(".crl");

            FileInfo fileInfo = new FileInfo(builder.ToString());

            if (!fileInfo.Directory.Exists)
            {
                fileInfo.Directory.Create();
            }

            File.WriteAllBytes(fileInfo.FullName, crl.RawData);
        }