How to extract signature/certificate from PDF

[#1]

Hi everyone!!! I have a problem and hope someone can help me.



I have a PDF form accessed via a secure connection which requires the user to identify himself using a digital certificate, and the PDF has to be signed in order to be sent and processed by a J2EE application.



When I receive the signed PDF, I must verify that the certificate used to sign the PDF is the same that was used to access the web page. I can get the certificate used to access the web from the session; but I have no idea of how can I extract the certificate from the PDF, I can access the date contained in the PDF but I don't see the node where the certificate is stored(in case it is stored).



Thanks in advance for the help.

[#2]

Hi

did you find a solution for your problem?

thanks

mergeandfuse@gmail.com

[#3]

No way.



We are trying to solve it via a different way.



Adobe Suppport told us there is a way of limiting which certificates can sign a Signature Field, and we are trying to find out how to do that, so we would allow only one specific certificate to sign the Signature field; this solution would fit us even better.



I'll post here if we find a solution.