I need help - I can help - PDF signed with PADES

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PDF signed with PADES

Printed From: Debenu Quick PDF Library - PDF SDK Community Forum
Category: For Users of the Library
Forum Name: I need help - I can help
Forum Description: Problems and solutions while programming with the Debenu Quick PDF Library and Debenu PDF Viewer SDK
URL: http://www.quickpdf.org/forum/forum_posts.asp?TID=3753
Printed Date: 02 May 24 at 1:19PM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com

Topic: PDF signed with PADES

Posted By: mLipok
Subject: PDF signed with PADES
Date Posted: 22 Oct 19 at 9:30PM

I read "PDF 32000-1:2008"

First Edition 2008-7-1

Question 1: Maybe you have a link to recent version ?

Problem:

in: Table 252 – Entries in a signature dictionary

Key: Contents

"For public-key signatures, Contents should be either a DER-encoded PKCS#1 binary data object or a DER-encoded PKCS#7 binary data object."

Question 2:

How to decode "DER-encoded PKCS#7" to human readable form

Something like in this following example:
https://support.microsoft.com/en-us/help/216830/how-to-view-the-contents-of-a-certificate" rel="nofollow - https://support.microsoft.com/en-us/help/216830/how-to-view-the-contents-of-a-certificate

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Here you can find description how to test my examples:
http://www.quickpdf.org/forum/forum_posts.asp?TID=2932&PID=12600&title=drawcapturedpagematrix-matrix-howto#12600

Replies:

Posted By: Ingo
Date Posted: 22 Oct 19 at 9:56PM

Hi Michal,

regarding "question 1" there isn't a real download-link.
A bit strange for a free and open file format but...
The new documented specification is only available as a paid download:
https://www.iso.org/news/ref2199.html

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Cheers,
Ingo

Posted By: Ingo
Date Posted: 22 Oct 19 at 10:00PM

Regarding "question 2"...
It's not a real QuickPDF-question but... ;-)

openSSL should feed your needs?
https://www.sslshopper.com/certificate-decoder.html

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Cheers,
Ingo

Posted By: mLipok
Date Posted: 22 Oct 19 at 10:42PM

Thanks for answer.

as to Q1:
https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/PDF32000_2008.pdf" rel="nofollow - https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/PDF32000_2008.pdf

https://www.iso.org/standard/63534.html" rel="nofollow - https://www.iso.org/standard/63534.html

and to Q2:

I need to validate PADES signature in PDF file, so this is related to PDF.
Unfortunately QuickPDF do not have support for PADES signatures, for checking and for signing.

So for now, I must maintain this by my self.

-------------
Here you can find description how to test my examples:
http://www.quickpdf.org/forum/forum_posts.asp?TID=2932&PID=12600&title=drawcapturedpagematrix-matrix-howto#12600

Posted By: Ingo
Date Posted: 23 Oct 19 at 9:04PM

Q1: 32000_2008 is the old one - the new one is for PDF 2.0

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Cheers,
Ingo