SignDoc.cs
- //
- // This code is part of Document Solutions for PDF demos.
- // Copyright (c) MESCIUS inc. All rights reserved.
- //
- using System;
- using System.IO;
- using System.Drawing;
- using GrapeCity.Documents.Pdf;
- using GrapeCity.Documents.Pdf.AcroForms;
- using GrapeCity.Documents.Text;
- using System.Security.Cryptography.X509Certificates;
-
- namespace DsPdfWeb.Demos
- {
- // This sample demonstrates how to create and sign a PDF with a .pfx file,
- // using a SignatureField.
- // The sample then loads the signed file back into another GcPdfDocument instance
- // and verifies the signature.
- // See also VisualSignature which is similar but adds a visual representation
- // of the signature.
- public class SignDoc
- {
- public int CreatePDF(Stream stream)
- {
- var doc = new GcPdfDocument();
- var page = doc.NewPage();
- var tf = new TextFormat() { Font = StandardFonts.Times, FontSize = 14 };
- page.Graphics.DrawString("Hello, World!\n" +
- "Signed by DsPdfWeb SignDoc sample.",
- tf, new PointF(72, 72));
-
- // Init a test certificate:
- var pfxPath = Path.Combine("Resources", "Misc", "DsPdfTest.pfx");
- var cert = new X509Certificate2(File.ReadAllBytes(pfxPath), "qq",
- X509KeyStorageFlags.MachineKeySet | X509KeyStorageFlags.PersistKeySet | X509KeyStorageFlags.Exportable);
- var sp = new SignatureProperties()
- {
- SignatureBuilder = new Pkcs7SignatureBuilder()
- {
- CertificateChain = new X509Certificate2[] { cert }
- },
- Location = "DsPdfWeb Demo Browser",
- SignerName = "DsPdfWeb",
- SigningDateTime = Common.Util.TimeNow(),
- };
-
- // Init a signature field to hold the signature:
- var sf = new SignatureField();
- sf.Widget.Rect = new RectangleF(72, 72 * 2, 72 * 4, 36);
- sf.Widget.Page = page;
- sf.Widget.BackColor = Color.LightSeaGreen;
- sf.Widget.DefaultAppearance.Font = StandardFonts.Helvetica;
- sf.Widget.ButtonAppearance.Caption = $"Signer: {sp.SignerName}\r\nLocation: {sp.Location}";
- // Add the signature field to the document:
- doc.AcroForm.Fields.Add(sf);
- // Connect the signature field and signature props:
- sp.SignatureField = sf;
-
- // Sign and save the document:
- // NOTES:
- // - Signing and saving is an atomic operation, the two cannot be separated.
- // - The stream passed to the Sign() method must be readable.
- doc.Sign(sp, stream);
-
- // Rewind the stream to read the document just created
- // into another GcPdfDocument and verify the signature:
- stream.Seek(0, SeekOrigin.Begin);
- var doc2 = new GcPdfDocument();
- doc2.Load(stream);
- SignatureField sf2 = (SignatureField)doc2.AcroForm.Fields[0];
- if (!sf2.Value.VerifySignatureValue())
- throw new Exception("Failed to verify the signature");
-
- // Done (the generated and signed document has already been saved to 'stream').
- return doc.Pages.Count;
- }
- }
- }
-