public void Sign3(String src, String name, String dest, X509Certificate[] chain, ICipherParameters pk, String digestAlgorithm, PdfSigner.CryptoStandard subfilter, String reason, String location) { PdfReader reader = new PdfReader(src); PdfSigner signer = new PdfSigner(reader, new FileStream(dest, FileMode.Create), new StampingProperties()); PdfSignatureAppearance appearance = signer.GetSignatureAppearance(); appearance.SetReason(reason); appearance.SetLocation(location); signer.SetFieldName(name); // Set a custom text and background image appearance.SetLayer2Text("This document was signed by Bruno Specimen"); appearance.SetImage(ImageDataFactory.Create(IMG)); appearance.SetImageScale(1); PrivateKeySignature pks = new PrivateKeySignature(pk, digestAlgorithm); signer.SignDetached(pks, chain, null, null, null, 0, subfilter); }