Debenu Quick PDF Library - PDF SDK Community Forum : Digital Signature http://www.quickpdf.org/forum/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Thu, 30 Apr 2026 07:06:11 +0000 Tue, 23 Feb 2021 23:36:31 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 11.01 360 www.quickpdf.org/forum/RSS_post_feed.asp?TID=3880 <![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[Digital Signature : maybe here:https://developers....]]> http://www.quickpdf.org/forum/digital-signature_topic3880_post15644.html#15644 Author: mLipok
Subject: 3880
Posted: 23 Feb 21 at 11:36PM

maybe here:
https://developers.foxitsoftware.com/kb/article/advanced-options-signing-pdf-files/

btw.
Somebody can provide how to modify this example to use CryptCards ?

]]> Tue, 23 Feb 2021 23:36:31 +0000 http://www.quickpdf.org/forum/digital-signature_topic3880_post15644.html#15644 <![CDATA[Digital Signature : @tfrost It worked! Thanks a lot.For...]]> http://www.quickpdf.org/forum/digital-signature_topic3880_post15555.html#15555 Author: DigitalSignature
Subject: 3880
Posted: 28 Jan 21 at 1:21PM

@tfrost It worked! Thanks a lot.

For others who would have a similar requirement to sign PDF using windows store certificate the process is as follows :

1) Start a signing intent with NewSignProcessFromXXX & use SignProcessID returned by this method on all API calls below
2) Get SHA1 hash of the certificate and call SetSignProcessCertFromStore
3) Specify signature field on PDF using SetSignProcessField, if you don't have one, it'll create it for you
4) Call EndSignProcessToXXX to sign PDF
5) GetSignProcessResult can be used to verify if PDF was signed successfully
]]> Thu, 28 Jan 2021 13:21:57 +0000 http://www.quickpdf.org/forum/digital-signature_topic3880_post15555.html#15555 <![CDATA[Digital Signature : @tfrost That was really helpful,...]]> http://www.quickpdf.org/forum/digital-signature_topic3880_post15544.html#15544 Author: DigitalSignature
Subject: 3880
Posted: 21 Jan 21 at 4:21AM

@tfrost That was really helpful, thank you. Will try this out and get back if I run into any issue.
]]> Thu, 21 Jan 2021 04:21:04 +0000 http://www.quickpdf.org/forum/digital-signature_topic3880_post15544.html#15544 <![CDATA[Digital Signature : I have not used a certificate...]]> http://www.quickpdf.org/forum/digital-signature_topic3880_post15543.html#15543 Author: tfrost
Subject: 3880
Posted: 20 Jan 21 at 1:34PM

I have not used a certificate from the Windows store, but I have used a certificate from a PFX file.

Basically you start a Sign Process with qp.NewSignProcessFromX, where X is 'file' or 'stream' or 'string' containing the PDF. This function returns a sign process ID which is required in all subsequent signing calls.

Then if you want a picture stamp, you may need to use SetSignProcessField, SetSignProcessFieldBounds, SetSignProcessFieldImageFromFile, and then you may need QP.SetNeedAppearances(0). 

Next, SetSignProcessSubFilter and SetSignProcessInfo if you need them.

Finally I use SetSignProcessPFXFromFile to load the certificate, but you would replace this with SetSignProcessCertFromStore. To save the signed PDF you call EndSignProcessToFile(id, outputpdffile) and qp.GetSignProcessResult. 

Make sure that you use a certificate which supports PDF-signing. Not all do. And it is essential to check, report and fix any error returns from the above functions, before continuing to the next one.

It does all work, but there is a lot to get right.  Persevere!
]]> Wed, 20 Jan 2021 13:34:43 +0000 http://www.quickpdf.org/forum/digital-signature_topic3880_post15543.html#15543 <![CDATA[Digital Signature : Hi, my application is in C/C++...]]> http://www.quickpdf.org/forum/digital-signature_topic3880_post15542.html#15542 Author: DigitalSignature
Subject: 3880
Posted: 20 Jan 21 at 8:40AM

Hi, my application is in C/C++ for Windows platform & I want to use Quick PDF library to generate multi-lingual PDFs that are digitally signed using one of the certificates on system.

I'm unable to get any documentation on how would one use Quick PDF library to digitally sign a PDF using a certificate from store. All I've got until now is SetSignProcessCertFromStore method from the documents, but there is no sample code on how do I go about using it.

Any documentation or samples or guide on this would be really helpful.
]]> Wed, 20 Jan 2021 08:40:20 +0000 http://www.quickpdf.org/forum/digital-signature_topic3880_post15542.html#15542