Debenu Quick PDF Library - PDF SDK Community Forum : Signed PDF info

Debenu Quick PDF Library - PDF SDK Community Forum : Signed PDF info http://www.quickpdf.org/forum/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Sun, 09 Aug 2026 07:30:54 +0000 Mon, 22 Feb 2016 07:51:23 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 11.01 360 www.quickpdf.org/forum/RSS_post_feed.asp?TID=3270 <![CDATA[Debenu Quick PDF Library - PDF SDK Community Forum]]> http://www.quickpdf.org/forum/forum_images/QPDF_Forum_Title.png http://www.quickpdf.org/forum/ <![CDATA[Signed PDF info : Thanks for the info, so it has...]]> http://www.quickpdf.org/forum/signed-pdf-info_topic3270_post13010.html#13010 Author: Chopinke
Subject: 3270
Posted: 22 Feb 16 at 7:51AM

Thanks for the info, so it has to be manually. I found a reference:

https://www.adobe.com/devnet-docs/acrobatetk/tools/DigSig/Acrobat_DigitalSignatures_in_PDF.pdf

I am working with DXE7, so I need to find a way to also verify the substring DSS.

]]> Mon, 22 Feb 2016 07:51:23 +0000 http://www.quickpdf.org/forum/signed-pdf-info_topic3270_post13010.html#13010 <![CDATA[Signed PDF info : Hi,actually there isn't a...]]> http://www.quickpdf.org/forum/signed-pdf-info_topic3270_post13008.html#13008 Author: Ingo
Subject: 3270
Posted: 19 Feb 16 at 8:16PM

Hi,

actually there isn't a function to check if there's an existing signature but you can do it yourself.

There are always some special tags in the pdf-source if there's an existing signature.

You can read the complete pdf-file from disc into a string.

Then you can convert it (for better search results) to upper cases.

Then you can search (with "Pos") for these special signatures.

I've done it with Delphi XE5 but you can do it similar with any other language.

// . . .

textkomplett := LoadFileToStr2(FName);

uppercontent := UpperCase(textkomplett);

If ( ( ( Pos('/TYPE /SIG', uppercontent) > 0 ) and

( Pos('/FT /SIG', uppercontent) > 0 ) ) or

( ( Pos('/TYPE/SIG', uppercontent) > 0 ) and

( Pos('/FT/SIG', uppercontent) > 0 ) ) or

( Pos('/SIGFLAGS', uppercontent) > 0 ) ) Then

sign_ja := '1';

// . . .

]]> Fri, 19 Feb 2016 20:16:36 +0000 http://www.quickpdf.org/forum/signed-pdf-info_topic3270_post13008.html#13008 <![CDATA[Signed PDF info : Hi,I can't seem to find the...]]> http://www.quickpdf.org/forum/signed-pdf-info_topic3270_post13007.html#13007 Author: Chopinke
Subject: 3270
Posted: 19 Feb 16 at 3:51PM

Hi,

I can't seem to find the function to determine if a PDF is digitally signed and the function to retrieve digital signature information to display to the user. I would like to display some information from what Adobe Reader displays in the Signatures panel.

Thanks!

Edited by Chopinke - 19 Feb 16 at 3:51PM]]> Fri, 19 Feb 2016 15:51:12 +0000 http://www.quickpdf.org/forum/signed-pdf-info_topic3270_post13007.html#13007