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

        public List<X509CRL> EnumerateCRLs(X509Certificate2 issuer)
        {
            if (issuer == null)
            {
                throw new ArgumentNullException("issuer");
            }

            List<X509CRL> crls = new List<X509CRL>();

            // check for CRL.
            DirectoryInfo info = new DirectoryInfo(this.Directory.FullName + Path.DirectorySeparatorChar + "crl");

            if (info.Exists)
            {
                foreach (FileInfo file in info.GetFiles("*.crl"))
                {
                    X509CRL crl = new X509CRL(file.FullName);

                    if (!Utils.CompareDistinguishedName(crl.Issuer, issuer.Subject))
                    {
                        continue;
                    }

                    if (!crl.VerifySignature(issuer, false))
                    {
                        continue;
                    }

                    if (crl.UpdateTime <= DateTime.UtcNow && (crl.NextUpdateTime == DateTime.MinValue || crl.NextUpdateTime >= DateTime.UtcNow))
                    {
                        crls.Add(crl);
                    }
                }
            }

            return crls;
        }