title: Read certificate from pdf
body: <p>I'm using ITextSharp in order to read certificate informations from digitally signed pdf document.</p>
  
  <p>The <code>ITextSharp.Text.Pdf.PdfPKCS7</code> class exposes three properties:</p>
  
  <ul>
  <li><code>Certificates</code> (as list)</li>
  <li><code>SignCertificate</code> (as single object)</li>
  <li><code>SignCertificateChain</code> (as list)</li>
  </ul>
  
  <p>How can I combine these three properties in order to achieve all info about a single certificate? </p>
  
  <p>I'd be able to show all certificate path (all nested certificates).</p>