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Broken signatures not detected in PDF

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#31856
Posted: 01/09/2015 09:06:58
by David ErÅ¡il (Standard support level)
Joined: 01/15/2013
Posts: 34

Hello,

I have got a password-protected PDF document with one broken/invalid signature (contains illegal characters). Both Adobe Acrobat and PDFNet detect one signature - however TElPDFDocument class keeps telling me the document contains no signature at all (Signed property is false and SignatureCount is set to 0).
Decrypting and opening seems to be working well, as other protected document (with valid signature) gives the proper result.

Is there a way to count all present signatures, including the broken ones, so the result for this document is 1?

Pdf document is attached as txt, password to open is "mini".

Thank you for any help.


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#31857
Posted: 01/09/2015 10:52:24
by Dmytro Bogatskyy (EldoS Corp.)

Hello,

Thank you for the sample PDF document.
This PDF document contains one signature with invalid PKCS#7 data. It was ignored by a component.
We will make a change to not ignore such signature. The change will go to the next build.
Quote
Is there a way to count all present signatures, including the broken ones, so the result for this document is 1?

At the moment, it is not possible.

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