Signing a PDF with a p12 file in Java

// Load the document
PDFSecure pdfDoc = new PDFSecure ("C:\\test\\myfile.pdf", null);
 
// Load the keystore that contains the digital id to use in signing
// which can be loaded from a pfx file, a p12 file, etc... 
FileInputStream pkcs12Stream = new FileInputStream ("C:\\test\\Leila.p12");
KeyStore store = KeyStore.getInstance("PKCS12");
store.load(pkcs12Stream, "mypassword".toCharArray());
pkcs12Stream.close();
 
// Create signing information using the "Leila" alias
SigningInformation signInfo = new SigningInformation (store, "Leila", "mypassword");
 
// Customize the signature appearance
SignatureAppearance signAppear = signInfo.getSignatureAppearance();
 
// Show an image instead of the signer's name on the left side of the signature field
signAppear.setVisibleName(false);
signAppear.setImagePosition(SwingConstants.LEFT);
signAppear.setImageFile("C:\\test\\image_1.png");
 
// Only show the signer's name and date on the right side of the signature field
signAppear.setVisibleCommonName(false);
signAppear.setVisibleOrgUnit(false);
signAppear.setVisibleOrgName(false);
signAppear.setVisibleLocal(false);
signAppear.setVisibleState(false);
signAppear.setVisibleCountry(false);
signAppear.setVisibleEmail(false);
 
// Create signature field on the first page
Rectangle2D signBounds = new Rectangle2D.Double (36, 36, 144, 48);
SignatureField signField = pdfDoc.addSignatureField(0, "signature", signBounds);
 
// Apply digital signature
pdfDoc.signDocument(signField, signInfo);
 
// Save the document
pdfDoc.saveDocument ("C:\\test\\output.pdf");

// Load the document PDFSecure pdfDoc = new PDFSecure ("C:\\test\\myfile.pdf", null); // Load the keystore that contains the digital id to use in signing // which can be loaded from a pfx file, a p12 file, etc... FileInputStream pkcs12Stream = new FileInputStream ("C:\\test\\Leila.p12"); KeyStore store = KeyStore.getInstance("PKCS12"); store.load(pkcs12Stream, "mypassword".toCharArray()); pkcs12Stream.close(); // Create signing information using the "Leila" alias SigningInformation signInfo = new SigningInformation (store, "Leila", "mypassword"); // Customize the signature appearance SignatureAppearance signAppear = signInfo.getSignatureAppearance(); // Show an image instead of the signer's name on the left side of the signature field signAppear.setVisibleName(false); signAppear.setImagePosition(SwingConstants.LEFT); signAppear.setImageFile("C:\\test\\image_1.png"); // Only show the signer's name and date on the right side of the signature field signAppear.setVisibleCommonName(false); signAppear.setVisibleOrgUnit(false); signAppear.setVisibleOrgName(false); signAppear.setVisibleLocal(false); signAppear.setVisibleState(false); signAppear.setVisibleCountry(false); signAppear.setVisibleEmail(false); // Create signature field on the first page Rectangle2D signBounds = new Rectangle2D.Double (36, 36, 144, 48); SignatureField signField = pdfDoc.addSignatureField(0, "signature", signBounds); // Apply digital signature pdfDoc.signDocument(signField, signInfo); // Save the document pdfDoc.saveDocument ("C:\\test\\output.pdf");