Sign XFA form

Hello,

I have a PDF with two AcroFields that are signature fields and and XFA
form. Some of the fields of the XFA form are filled and the first signature
field is signed using Adobe Reader. The filled XFA fields are signed by
that signature. Please see attached PDF sample (confirmare.pdf).

I fill the rest of the XFA fields (please see filled.pdf sample) using
itext, and than I need to sign the XFA form, but place the signature in the
second signature field (AcroField) already present in the PDF. If I use the
code from the documentation, the signature is OK but in the signed version
the fields of XFA form that I filled before signing are empty. So they were
not actually signed. Please see third PDF sample.

reader = new PdfReader(CalePtSalvareaCererii);
fs = new FileStream(CalePtSalvareaCererii.Replace(".pdf", "_sig.pdf"),
FileMode.Create);
stamper = PdfStamper.CreateSignature(reader, fs, '\0', null, true);

X509Store store = new X509Store(StoreLocation.CurrentUser);
store.Open(OpenFlags.ReadOnly);
X509Certificate2Collection sel =
X509Certificate2UI.SelectFromCollection(store.Certificates, null, null,
X509SelectionFlag.SingleSelection);

X509Certificate2 cert = sel[0];

Org.BouncyCastle.X509.X509CertificateParser cp = new
Org.BouncyCastle.X509.X509CertificateParser();
Org.BouncyCastle.X509.X509Certificate[] chain = new
Org.BouncyCastle.X509.X509Certificate[] {

cp.ReadCertificate(cert.RawData)};

iTextSharp.text.pdf.security.IExternalSignature externalSignature = new
iTextSharp.text.pdf.security.X509Certificate2Signature(cert, "SHA-1");

PdfSignatureAppearance appearance = stamper.SignatureAppearance;
appearance.SetVisibleSignature("form1[0].body[0].Confirmare[0].SignatureField1[0]");
appearance.CertificationLevel =
PdfSignatureAppearance.CERTIFIED_FORM_FILLING_AND_ANNOTATIONS;
iTextSharp.text.pdf.security.MakeSignature.SignDetached(appearance,
externalSignature, chain, null, null, null, 0,
iTextSharp.text.pdf.security.CryptoStandard.CMS);

stamper.Close();
reader.Close();
fs.Close();

Can someone help me to solve the issue?

Thank you in advance!

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