Hi Elias_iText, I don't expect any p7s-Viewer to be able to 'verify' an arbitrary hash. And I would doubt any legal effect from a verification that isn't directly derived from the original document. The approach 'I got some hash bytes from some part of a document, so believe me that everything's correct' won't take you far ;-)
Greetings, Andreas > Michael, it´s very complicate to explain for you, but I will try... I have > a new legal process to follow where the signed PDF document CAN BE converted > to other file standard, like .P7S type. I think the P7S viewer will not show > the first signatures after the conversion. So, I need to guarantee the first > signatures, I don't know, I think to store the signature data, or some like > that, inside other legal document in order to prove later that fisrt PDF > document is autentic. Seems a crazy way but that's what I was asked to > investigate. > > I don't know if exist some P7S viewer or signer that can keep and show the > PDF signatures (that would solve the problem). > > It's a new process to be implemented and I don't know yet the best way to > follow. > > tks a lot. > > PS. About the byte ranges, I get it > > > > -- > View this message in context: > http://itext-general.2136553.n4.nabble.com/How-to-get-the-HASH-from-a-signature-tp4655996p4656004.html > Sent from the iText - General mailing list archive at Nabble.com. > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > iText-questions mailing list > [email protected] > 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 -- Andreas Kühne phone: +49 177 293 24 97 mailto: [email protected] Trustable Ltd. Niederlassung Deutschland Ströverstr. 18 - 59427 Unna Amtsgericht Hamm HRB 5868 Directors Andreas Kühne, Heiko Veit Company UK Company No: 5218868 Registered in England and Wales ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ iText-questions mailing list [email protected] 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
