Sign PDF with iTextSharp 5.3.3 and USB token

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This approach works fine for us (iTextSharp 5.3.3). We use smart-card and USB-token (vendor – www.author.kiev.ua):

            X509Store store = new X509Store(StoreLocation.CurrentUser);
            store.Open(OpenFlags.ReadOnly);
            X509Certificate2Collection sel = X509Certificate2UI.SelectFromCollection(store.Certificates, null, null, X509SelectionFlag.SingleSelection);

            X509Certificate2 cert = sel[0];

            Org.BouncyCastle.X509.X509CertificateParser cp = new Org.BouncyCastle.X509.X509CertificateParser();
            Org.BouncyCastle.X509.X509Certificate[] chain = new Org.BouncyCastle.X509.X509Certificate[] {
            cp.ReadCertificate(cert.RawData)};

            IExternalSignature externalSignature = new X509Certificate2Signature(cert, "SHA-1");

            PdfReader pdfReader = new PdfReader(pathToBasePdf);

            signedPdf = new FileStream(pathToBasePdf, FileMode.Create);

            pdfStamper = PdfStamper.CreateSignature(pdfReader, signedPdf, '\0');
            PdfSignatureAppearance signatureAppearance = pdfStamper.SignatureAppearance;

            signatureAppearance.SignatureGraphic = Image.GetInstance(pathToSignatureImage);
            signatureAppearance.SetVisibleSignature(new Rectangle(100, 100, 250, 150), pdfReader.NumberOfPages, "Signature");
            signatureAppearance.SignatureRenderingMode = PdfSignatureAppearance.RenderingMode.GRAPHIC_AND_DESCRIPTION;

            MakeSignature.SignDetached(signatureAppearance, externalSignature, chain, null, null, null, 0, CryptoStandard.CMS);

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