Hello, Thanks for your help Balder.
I am trying again to explain the problem I encounter: I need to apply a PDF Signature to the XFA form itself: - when the PDF file is a static PDF, I get a VALID signature and I can see through acrobat Reader that everything is correct. - when the PDF file is a dynamic PDF, I get an INVALID signature. If I sign the dynamic PDF with acrobat pro and compare it with the signed file I get with my program, I can clearly see that the part I am missing is contained is the XFA form: the node <form> is incorrect. * Acrobat Pro computes a checksum that is added to the node <form>.* This checksum is apparently a kind of digest of the PDF file. Its length corresponds to a SHA1 digest. In my mind, it is probably the digest of the whole signed file except the node <form> but I unfortunately cannot confirm that. In the "xfa_spec_3_1.pdf" documentation, the corresponding section is: Chapter 16, Security and Reliability -- PDF Signatures page 559 and I can read this: "When the PDF signature covers all fields in the form its computation includes the entire XFA form embedded in the PDF and most of the non-XFA content in the PDF as well. Some portions of the non-XFA content are omitted as specified in the PDF standard [PDF]." But that is exactly what I am doing and it works for the static PDF files. Any guess? Thanks very much in advance, Emmanuel PS: my input in attached piece http://itext-general.2136553.n4.nabble.com/file/n3662413/original_input.pdf original_input.pdf -- View this message in context: http://itext-general.2136553.n4.nabble.com/Xfa-signature-tp2172306p3662413.html Sent from the iText - General mailing list archive at Nabble.com. ------------------------------------------------------------------------------ All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2d-c2 _______________________________________________ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions iText(R) is a registered trademark of 1T3XT BVBA. Many questions posted to this list can (and will) be answered with a reference to the iText book: http://www.itextpdf.com/book/ Please check the keywords list before you ask for examples: http://itextpdf.com/themes/keywords.php
