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//Load the PDF document
FileStream docStream = new FileStream("../../../Barcode.pdf", FileMode.Open, FileAccess.Read);
//Load the PDF document.
PdfLoadedDocument loadedDocument = new
PdfLoadedDocument(docStream);
//Create signature.
PdfSignature signature = new
PdfSignature(loadedDocument, loadedDocument.Pages[0], null, "Signature");
//Sets the signature information.
signature.Bounds = new RectangleF(new PointF(0, 0), new SizeF(100, 30));
//Set the cryptographic standard.
signature.Settings.CryptographicStandard
= CryptographicStandard.CADES;
signature.Settings.DigestAlgorithm = DigestAlgorithm.SHA256;
//Create an external signature.
IPdfExternalSigner externalSignature = new ExternalSigner("SHA256");
//Add public certificates.
System.Collections.Generic.List<X509Certificate2>
certificates = new
System.Collections.Generic.List<X509Certificate2>();
X509Certificate2 digitalId = new X509Certificate2(@"../../../certchain.pfx", "password", X509KeyStorageFlags.Exportable);
X509Chain chain = new X509Chain();
chain.Build(digitalId);
for (int i = 0; i <
chain.ChainElements.Count; i++)
{
certificates.Add(chain.ChainElements[i].Certificate);
}
//Add external signer to the signature.
signature.AddExternalSigner(externalSignature,
certificates, null);
//Create LTV
signature.CreateLongTermValidity(certificates);
//Set timestamp server.
signature.TimeStampServer = new TimeStampServer(new Uri(http://timestamping.ensuredca.com));
MemoryStream stream = new MemoryStream();
//Save and close the document.
loadedDocument.Save(stream);
loadedDocument.Close(true);
//Load the PDF document.
loadedDocument = new PdfLoadedDocument(stream);
//Load the existing PDF page.
PdfLoadedPage lpage = loadedDocument.Pages[0] as PdfLoadedPage;
//Create PDF signature with empty certificate.
PdfSignature timeStamp = new PdfSignature(lpage, "timestamp");
timeStamp.TimeStampServer
= new TimeStampServer(new Uri(http://timestamping.ensuredca.com));
MemoryStream str = new MemoryStream();
//Save and dispose the document.
loadedDocument.Save(str);
loadedDocument.Close(true);
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