Adding Digital Certificate to PDF

How to Add Visible Digital Certificate to a PDF in C#

The following steps and sample code add a visible digital certificate to a PDF document using DynamicPDF Core Suite.

Steps for Adding a Visible Digital Certificate to a PDF Document

1. Create a Document object.
2. Create a Page object.
3. Create a Signature object and set its properties
4. Add the Signature object instance to the Page object.
5. Add the Page object to the Document object.
6. Create a Certificate object and set its properties
7. Sign the document with the Certify method by passing the signature fieldname and certificate to the constructor.
8. Save the PDF document.

Sample Code - C#

Document document = new Document();
Page page = new Page(PageSize.Letter);
            
//Create & add Signature Form Field
Signature signature = new Signature("SigField", 10, 10, 250, 100);
page.Elements.Add(signature);
document.Pages.Add(page);
Certificate certificate = new Certificate(@"JohnDoe.pfx", "password");

// Field name should be one of the signature field name 
document.Certify("SigField", certificate, CertifyingPermission.NoChangesAllowed);
            
document.Draw("output.pdf");        

How to Add an Invisible Digital Certificate to PDF in C#

The following steps and sample code add an invisible digital certificate to a PDF document using DynamicPDF Core Suite.

Steps for Adding an Invisible Digital Certificate to a PDF Document

1. Create a Document object.
2. Create a Page object and add it to the Document object.
3. Create a Certificate object and set its properties.
4. Invoke the Certify method on the document and pass a non-existent fieldname and certificate to the constructor.
5. Save the PDF document.

Sample Code - C#

Document document = new Document();
Page page = new Page(PageSize.Letter);
document.Pages.Add(page);
 
Certificate certificate = new Certificate(@"JohnDoe.pfx", "password");

document.Certify("NonExistingField", certificate, CertifyingPermission.NoChangesAllowed);
            
document.Draw(@"Output.pdf");        

GitHub Project

Clone or view the example project at GitHub. This example code is contained in the Examples/CertificateExample.cs file.

Getting Started

NuGet Package

DynamicPDF Core Suite is available on NuGet and is part of the ceTe.DynamicPDF.CoreSuite.NET package. The easiest way to install the package is through the Visual Studio Package Manger. You can also download the package directly on NuGet.

DynamicPDF Core Suite Information

More information on the DynamicPDF Core Suite can be found on its website.

• DynamicPDF Core Suite for .NET

Available on Other platforms

DynamicPDF Core Suite is also available for the Java and Com/ActiveX platforms. Refer to the respective product pages for more details.

• Java - DynamicPDF Generator for Java
• COM/ActiveX - DynamicPDF Generator for COM/ActiveX