We are not sure 100% what you want to do.
1. Probably you want to emulate Acrobat's behavior when user clicks on
signature area and signs document. In this case we should apply standard
Acrobat signature approach.
PdfReader reader =new PdfReader(src);
FileOutputStream os =new FileOutputStream(dest);
PdfStamper stamper = PdfStamper.createSignature(reader, os, '\0',null,true);
// Creating the appearance
PdfSignatureAppearance appearance = stamper.getSignatureAppearance();
// linking PdfSignature with acroform signature filed (not necessary)
appearance.setVisibleSignature("SignatureField1");
appearance.setCertificationLevel(PdfSignatureAppearance.CERTIFIED_FORM_FILLING);
// Creating the signature
ExternalSignature pks =new PrivateKeySignature(pk,"SHA-256","BC");
ExternalDigest digest =new BouncyCastleDigest();
MakeSignature.signDetached(appearance, digest, pks, chain,null,null,null, 0,
MakeSignature.CryptoStandard.CMS);
2. In case you want to sign a specific Dataset of an XFA form and you
want the signature to be validated by Acrobat, you should use the
XmlDSig approach, because Acrobat doesn't support XAdES (yet):
PdfReader reader =new PdfReader(src);
FileOutputStream os =new FileOutputStream(dest);
PdfStamper stamper = PdfStamper.createXmlSignature(reader, os);
XmlSignatureAppearance appearance = stamper.getXmlSignatureAppearance();
appearance.setXmlLocator(new XfaXmlLocator(stamper));
appearance.setXpathConstructor(new
XfaXpathConstructor(XfaXpathConstructor.XdpPackage.Datasets));
ExternalSignature signature =new PrivateKeySignature(pk, digestAlgorithm,"BC");
//use signXmlDSig instead of signXades
MakeXmlSignature.signXmlDSig(appearance, signature, chain);
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