.NET Framework 4.5.2+
.NET Framework 4.5.2+
.NET Standard 2.0+
.NET Core 3.0+

PdfSignature Class

An electronic signature used to sign a PDF file.

Namespace: DevExpress.Pdf

Assembly: DevExpress.Pdf.v19.2.Core.dll

Declaration

public class PdfSignature :
    PdfObject
Public Class PdfSignature
    Inherits PdfObject
public class PdfSignature :
    PdfObject
Public Class PdfSignature
    Inherits PdfObject
public class PdfSignature :
    PdfObject
Public Class PdfSignature
    Inherits PdfObject

Remarks

The PdfSignature class represents a signature with the CMS/PKCS #7 message and the specified certificate. The PdfDocumentProcessor uses the adbe.pkcs7.sha1 signature value encoding.

Pass PdfOrientedRectangle object as the constructor's signatureBounds parameter to specify the signature's bounds. You can also specify the rotation angle for the signature (in radians) when you create a PdfOrientedRectangle object. A positive angle rotates it counter-clockwise and a negative angle rotates it clockwise.

//...
X509Certificate2 certificate = new X509Certificate2(@"..\..\SignDemo.pfx", "dxdemo");

byte[] imageData = File.ReadAllBytes("..\\..\\Signature.png");
int pageNumber = 1;
int angleInDegrees = 45;
double angleInRadians = angleInDegrees * (Math.PI / 180);
PdfOrientedRectangle signatureBounds = new PdfOrientedRectangle(new PdfPoint(0, 460), 250, 90, angleInRadians);
PdfSignature signature = new PdfSignature(certificate, imageData, pageNumber, signatureBounds);

The PdfSignature class properties allow you to specify the signature's name, reason, location, contact information, and signing time.

Pass a PdfSaveOptions object as a parameter with a signature to the PdfDocumentProcessor.SaveDocument method to save a document with signing information.

Use the PdfSaveOptions.Signature property to access a PdfSignature object.

Examples

This example illustrates how to add a visual signature to a PDF document.

To accomplish this task, do the following:

using DevExpress.Pdf;
using System;
using System.IO;
using System.Security.Cryptography.X509Certificates;

namespace PDFSignature {
    class Program {
        static void Main(string[] args) {

            // Create a PDF document processor.
            using (PdfDocumentProcessor documentProcessor = new PdfDocumentProcessor()) {

                // Load a PDF document. 
                documentProcessor.LoadDocument(@"..\..\Demo.pdf");

                // Create a visual signature using certificate, image data, and specifying  page number, signature bounds and rotation angle. 
                X509Certificate2 certificate = new X509Certificate2(@"..\..\SignDemo.pfx", "dxdemo");
                byte[] imageData = File.ReadAllBytes("..\\..\\Signature.png");
                int pageNumber = 1;
                int angleInDegrees = 45; 
                double angleInRadians = angleInDegrees * (Math.PI / 180);
                PdfOrientedRectangle signatureBounds = new PdfOrientedRectangle(new PdfPoint(620, 210), 250, 90, angleInRadians);
                PdfSignature signature = new PdfSignature(certificate, imageData, pageNumber, signatureBounds);

                // Specify signing location, contact info and reason.
                signature.Location = "USA";
                signature.ContactInfo = "john.smith@example.com";
                signature.Reason = "Approved";

                // Save the signed document.
                documentProcessor.SaveDocument(@"..\..\SignedDocument.pdf", new PdfSaveOptions() { Signature = signature });
            }
        }
    }
}

Inheritance

Object
DevExpress.Pdf.Native.PdfDocumentItem
DevExpress.Pdf.Native.PdfObject
PdfSignature
See Also