Java Tutorial/PDF/Security

Add Certificate to Pdf document

   <source lang="java">

import java.io.FileInputStream; import java.io.FileOutputStream; import java.security.KeyStore; import java.security.PrivateKey; import java.security.cert.Certificate; import com.lowagie.text.pdf.PdfReader; import com.lowagie.text.pdf.PdfSignatureAppearance; import com.lowagie.text.pdf.PdfStamper; public class MainClass {

 public static void main(String[] args) throws Exception {
   PdfReader reader;
   KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
   ks.load(new FileInputStream(".keystore"), "string".toCharArray());
   PrivateKey key = (PrivateKey) ks.getKey("key", "value".toCharArray());
   Certificate[] chain = ks.getCertificateChain("foobar");
   reader = new PdfReader("2.pdf");
   FileOutputStream os = new FileOutputStream("1.pdf");
   PdfStamper stamper = PdfStamper.createSignature(reader, os, "\0");
   PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
   appearance.setCrypto(key, chain, null, PdfSignatureAppearance.SELF_SIGNED);
   appearance.setReason("personal");
   appearance.setLocation("Foobar");
   appearance.setVisibleSignature("yoursig");
   stamper.close();
 }

}</source>

PDF with an unsigned signature field

   <source lang="java">

import java.io.FileOutputStream; import com.lowagie.text.Document; import com.lowagie.text.Paragraph; import com.lowagie.text.pdf.PdfAcroForm; import com.lowagie.text.pdf.PdfWriter; public class MainClass {

 public static void main(String[] args) throws Exception {
   Document document = new Document();
   PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("2.pdf"));
   document.open();
   document.add(new Paragraph("This is a message."));
   PdfAcroForm acroForm = writer.getAcroForm();
   acroForm.addSignature("yoursig", 73, 705, 149, 759);
   document.close();
 }

}</source>