Make a signed pdf ltv enabled RRS feed

  • Question

  • I have a method that returns a signed pdf which is not ltv enabled. How do I modify the method so that it returns ltv enabled pdf's?

    Heres the method

    public byte[] Sign(byte[] document, X509Certificate2 certificate, ITSAClient tsaClient)
                byte[] signedDocument = null;

                IExternalSignature signature = new X509Certificate2Signature(certificate, "SHA-1");
                Org.BouncyCastle.X509.X509CertificateParser cp = new Org.BouncyCastle.X509.X509CertificateParser();
                Org.BouncyCastle.X509.X509Certificate[] chain = new Org.BouncyCastle.X509.X509Certificate[] { cp.ReadCertificate(certificate.RawData) };

                PdfReader reader = new PdfReader(document);
                MemoryStream ms = new MemoryStream();
                PdfStamper st = PdfStamper.CreateSignature(reader, ms, '\0');

                PdfSignatureAppearance sap = st.SignatureAppearance;
                sap.CertificationLevel = PdfSignatureAppearance.CERTIFIED_NO_CHANGES_ALLOWED;
                sap.SignatureCreator = "NAME";
                sap.Reason = "REASON";
                sap.Contact = "CONTACT";
                sap.Location = "LOCATION";
                sap.SignDate = DateTime.Now;

                RectangleF rectangle = new RectangleF(400.98139f, 54.88828f, 530, 84.88828f);
                sap.Layer2Font = iTextSharp.text.FontFactory.GetFont(BaseFont.TIMES_ROMAN, BaseFont.CP1257, 7f);
                sap.Layer2Font.Color = iTextSharp.text.BaseColor.RED;
                sap.Layer2Text = string.Format("Signed for testing: {0}", DateTime.Now.ToString("dd.MM.yyyy."));
                sap.SignatureRenderingMode = PdfSignatureAppearance.RenderingMode.DESCRIPTION;
                sap.SetVisibleSignature(new iTextSharp.text.Rectangle(rectangle.X, rectangle.Y, rectangle.Width, rectangle.Height), 1, null);

                MakeSignature.SignDetached(sap, signature, chain, null, null, tsaClient, 0, CryptoStandard.CMS);


                signedDocument = ms.ToArray();


                return signedDocument;

    • Moved by CoolDadTx Friday, September 14, 2018 1:46 PM Third party product
    Friday, September 14, 2018 12:29 PM

All replies

  • Unfortunately you're using third party libraries to work with the PDF. It looks like maybe iTextSharp. Please post your question related to using their library in their forums.

    Michael Taylor

    Friday, September 14, 2018 1:46 PM