Robert,
RobertQ wrote: > >> Then is there any way to verify a PDF signature using iText??? >> >> >> iText allows you to extract both the signature container and the signed >> data stream for each signature. Without too much hassle you can thus >> verify the PDF signatures using a crypto library of your choice. >> >> Regards, Michael. >> > Quoted from: > http://www.nabble.com/Verifying-signature%21%21-NoSuchAlgorithmException%3A-1.2.840.113549.1.1.1-tp23673079p23683498.html > > I know how to verify a signature by using a crypto library.But how can I > extract the signature container and the signed data stream for each > siganture. Could you show me some example of the code. > Use the AcroFields methods getSignatureNames and getSignatureDictionary. The latter dictionary contains the signature container (key: PdfName.CONTENTS, apply getOriginalBytes) and the range data (key: PdfName.BYTERANGE). Use something like the class PdfSignatureAppearance.RangeStream to extract the signed data. Regards, Mikel. -- View this message in context: http://www.nabble.com/Verifying-signature%21%21-NoSuchAlgorithmException%3A-1.2.840.113549.1.1.1-tp23673079p23777566.html Sent from the iText - General mailing list archive at Nabble.com. ------------------------------------------------------------------------------ Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT is a gathering of tech-side developers & brand creativity professionals. Meet the minds behind Google Creative Lab, Visual Complexity, Processing, & iPhoneDevCamp as they present alongside digital heavyweights like Barbarian Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com _______________________________________________ iText-questions mailing list [email protected] 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/
