title: Generate PDF with digital signature by nodejs
body: <p>Recently, i tried to generate pdf by nodejs. </p>
  
  <p>And i finally found the <a href="http://pdfkit.org/index.html" rel="noreferrer">PDFKit</a>.</p>
  
  <p>That library is doing well,but i need to implement the part of digital signature.</p>
  
  <p>But most of implementation are for JAVA or C# like iText or VersyPDF.</p>
  
  <p>Plz give me some suggestion...thx</p>