Kang Ku, Lee, Kang Ku, Lee wrote > I will test verify the signed PDF file > http://korea.blogsite.org/MyHome/download/modified_signed.pdf. > This file is modified by hex editor. > > The acrobat PDF reader is invalid signature. This is OK!!!. > > But, when I try same file with iText PdfPKCS7 class, The signature is > valid!!! Why????
Please provide the versions of iText and of BouncyCastle you use. Testing your code with the current iText trunk and BC 1.47, I get the *java.lang.ClassCastException: org.bouncycastle.asn1.BERTaggedObject cannot be cast to org.bouncycastle.asn1.ASN1Set* already reported by Alfonso Maria Massa last October <http://itext-general.2136553.n4.nabble.com/iText-questions-failure-in-verify-signature-using-SignWithBC-tt4656565.html> . (Actually this is a bug in BouncyCastle --- BC expects certain data to be DER encoded where any BER encoding is allowed; in your signature that data is not DER encoded; it, therefore, triggers the BC bug.) Testing it with a patched PdfPKCS7.java (inspired by Alfonso's patch which circumvents the BC bug, but with a fix), I get "Revision modified: true" which is the expected result. So I never get a false "Revision modified: false". Regards, Michael -- View this message in context: http://itext-general.2136553.n4.nabble.com/iText-PdfPKCS7-verify-somethig-wrong-tp4657188p4657239.html Sent from the iText - General mailing list archive at Nabble.com. ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnmore_122712 _______________________________________________ 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
