Tambahkan Tanda Tangan Digital ke PNG di Java

Signature signature = new Signature("sample.pdf"); 
DigitalSignOptions options = new DigitalSignOptions("certificate.pfx");
 
// sertifikasi kata sandi
options.setPassword("1234567890");
// detail sertifikat digital
options.setReason("Sign");
options.setContact("JohnSmith");
options.setLocation("Office1");
 
// gambar sebagai tampilan sertifikat digital pada halaman dokumen
options.setImageFilePath("sample.jpg");
//
options.setAllPages(true);
options.setWidth(80);
options.setHeight(60);
options.setVerticalAlignment(VerticalAlignment.Bottom);
options.setHorizontalAlignment(HorizontalAlignment.Right);
Padding padding = new Padding();
padding.setBottom(10);
padding.setRight(10);
options.setMargin(padding);
 
SignResult signResult = signature.sign("signed.png", options);
// menganalisis hasil
System.out.print("List of newly created signatures:");
int number = 1;
for(BaseSignature temp : signResult.getSucceeded())
{
    System.out.print("Signature #"+ number++ +": Type: "+temp.getSignatureType()+" Id:"+temp.getSignatureId()+
            ",Location: "+temp.getLeft()+"x"+temp.getTop()+". Size: "+temp.getWidth()+"x"+temp.getHeight());
}