DigitalSignature - Run Time

Question

How to insert the signature by digital certificate at runtime.

The goal is to generate the PDF with the signature already in place without user intervention.

The PDF will have several pages, and each page will have a place for the digital signature.

The signature file will be "ANY NAME.PFX, "PASSWORD""

Emily Foster · Answer

To insert a digital signature using a digital certificate at runtime into a PDF without user intervention, you can utilize a programming language like Java along with libraries that support digital signatures like Bouncy Castle or iText. Here's a high-level overview of the process: 1. Load the PDF document that you want to sign. 2. Load the digital certificate from the ".pfx" file using the provided password. 3. Create a digital signature with the certificate's private key. 4. Add the digital signature to each page of the PDF document. Below is a simplified example using Java and the iText library to demonstrate how you can digitally sign a PDF at runtime: import com.itextpdf.text.pdf.PdfReader; import com.itextpdf.text.pdf.PdfStamper; import com.itextpdf.text.pdf.PdfSignatureAppearance; import java.io.FileInputStream; import java.security.KeyStore; import java.security.PrivateKey; import java.security.cert.Certificate; public class DigitalSignatureExample { public static void main(String[] args) { try { String pdfFilePath = "path/to/input.pdf"; String outputPdfFilePath = "path/to/output.pdf"; String pfxFilePath = "path/to/ANY NAME.PFX"; String password = "PASSWORD"; KeyStore ks = KeyStore.getInstance("PKCS12"); ks.load(new FileInputStream(pfxFilePath), password.toCharArray()); String alias = (String) ks.aliases().nextElement(); PrivateKey privateKey = (PrivateKey) ks.getKey(alias, password.toCharArray()); Certificate[] chain = ks.getCertificateChain(alias); PdfReader reader = new PdfReader(pdfFilePath); PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(outputPdfFilePath)); PdfSignatureAppearance appearance = stamper.getSignatureAppearance(); appearance.setCertificate(chain[0]); appearance.setReason("Digitally signed by me"); appearance.setLocation("Location"); appearance.setVisibleSignature(new Rectangle(100, 100, 200, 200), 1, "signature"); appearance.setCrypto(privateKey, chain, null, PdfSignatureAppearance.SELF_SIGNED); stamper.close(); } catch (Exception e) { e.printStackTrace(); } } } Remember to handle exceptions, manage resources properly, and customize the signature appearance as needed. This code snippet provides a basic structure for adding a digital signature at runtime to a PDF file using a digital certificate stored in a ".pfx" file.