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mLipok View Drop Down
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Joined: 23 Apr 14
Location: Poland, Zabrze
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Points: 449 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mLipok Quote  Post ReplyReply Direct Link To This Post Topic: PDF signed with PADES
    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 
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
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Ingo View Drop Down
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Points: 3524 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ingo Quote  Post ReplyReply Direct Link To This Post 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
Cheers,
Ingo
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Ingo View Drop Down
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Points: 3524 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ingo Quote  Post ReplyReply Direct Link To This Post 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
Cheers,
Ingo
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mLipok View Drop Down
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Joined: 23 Apr 14
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Points: 449 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mLipok Quote  Post ReplyReply Direct Link To This Post Posted: 22 Oct 19 at 10:42PM
Thanks for answer.


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
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Ingo View Drop Down
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Joined: 29 Oct 05
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Points: 3524 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ingo Quote  Post ReplyReply Direct Link To This Post Posted: 23 Oct 19 at 9:04PM
Q1: 32000_2008 is the old one - the new one is for PDF 2.0
Cheers,
Ingo
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