The Contents aren't signed by the PDF signature - they can't be (otherwise you get infinite recursion). However, some parts of the Contents (which is a PKCS#7 package) _MAY_ be a signed attribute and thus you could get failure from that side.
Any other change to the PDF will cause it to fail validation. Leonard -----Original Message----- From: Tamas [mailto:info...@gmail.com] Sent: Tuesday, October 06, 2009 6:18 AM To: itext-questions@lists.sourceforge.net Subject: Re: [iText-questions] What Part of the PDF document is signed by PdfStamper Additionally... and what happens, when I modify the signature itself. Please see the attached zip code example and the screen shot about that where the modification was made in the pdf, and it was still valid in IText. (In Adobe Reader 9.0 the signature had the right state -> "At least one signature is invalid") I do each validation from code with IText and I'd like to be sure the the document is not modified even if the signature is the only one modified document part. Bests, Tamas Tamas wrote: > > Thank you Leonard! > > You mean that all of the previous signatures are signed with the last one? > > Bests > > Tamas > > > > > Leonard Rosenthol-3 wrote: >> >> ALL of the PDF, except the signature itself, is signed. >> >> Leonard >> >> >> On 10/5/09 4:59 AM, "Tamas" <info...@gmail.com> wrote: >> >>> >>> Dear IText Experts, >>> >>> What part of the pdf document is signned when I use the >>> PdfStamper.CreateSignature and the PdfSignatureAppearance.SetCrypto >>> method? >>> >>> My code is the folowing: >>> PdfStamper st = PdfStamper.CreateSignature(reader, new >>> FileStream(this.outputPDF, FileMode.Create, FileAccess.Write), '\0', >>> null, >>> true); >>> st.MoreInfo = this.metadata.getMetaData(); >>> st.XmpMetadata = this.metadata.getStreamedMetaData(); >>> PdfSignatureAppearance sap = st.SignatureAppearance; >>> >>> sap.SetCrypto(this.myCert.Akp, this.myCert.Chain, null, >>> PdfSignatureAppearance.WINCER_SIGNED); >>> ... >>> st.Close(); >>> >>> After I signed an existing pdf document I modified some of the bytes >>> randomly and several times the adobe reader 9 informed me about that all >>> of >>> the signatures are valid. How did it happend? I looked over the pdf 1.4 >>> documentation and I found that the whole pdf and only a part of the pdf >>> can >>> be signed as well. When I use the PdfStamper.CreateSignature which part >>> of >>> the pdf doc will be signed? >>> >>> Thanks >>> >>> Tamas >> >> -- >> Leonard Rosenthol >> PDF Standards Architect >> Adobe Systems >> >> >> >> ------------------------------------------------------------------------------ >> Come build with us! The BlackBerry® Developer Conference in SF, CA >> is the only developer event you need to attend this year. Jumpstart your >> developing skills, take BlackBerry mobile applications to market and stay >> ahead of the curve. Join us from November 9-12, 2009. Register >> now! >> http://p.sf.net/sfu/devconf >> _______________________________________________ >> iText-questions mailing list >> iText-questions@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/itext-questions >> >> Buy the iText book: http://www.1t3xt.com/docs/book.php >> Check the site with examples before you ask questions: >> http://www.1t3xt.info/examples/ >> You can also search the keywords list: >> http://1t3xt.info/tutorials/keywords/ >> >> > > http://www.nabble.com/file/p25768503/VerifySignature.zip VerifySignature.zip http://www.nabble.com/file/p25768503/WhereItWasRepleacedInMyPdf.JPG WhereItWasRepleacedInMyPdf.JPG -- View this message in context: http://www.nabble.com/What-Part-of-the-PDF-document-is-signed-by-PdfStamper-tp25749465p25768503.html Sent from the iText - General mailing list archive at Nabble.com. ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://www.1t3xt.com/docs/book.php Check the site with examples before you ask questions: http://www.1t3xt.info/examples/ You can also search the keywords list: http://1t3xt.info/tutorials/keywords/ ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://www.1t3xt.com/docs/book.php Check the site with examples before you ask questions: http://www.1t3xt.info/examples/ You can also search the keywords list: http://1t3xt.info/tutorials/keywords/
