How to verify existing PDF signature

Question

After I digitally signed PDF with .pfx. I need to verify whether it has been modified by other or not. I could not find any method to verify the file.

Is the verification feature available with Syncfusion Flutter library? Thanks.

Chinnu Muniyappan · Answer

Hi Kokpheng, 
 
Thank you for contacting Syncfusion support. 
 
At present we do not have support for validating digital signatures in an existing PDF document. We have logged a feature request for this in our feature request list and we do not have any immediate plan to implement this feature. We will implement this feature in any of our upcoming releases. At the planning stage for every release cycle, we review all open features and identify features for implementation based on specific parameters including product vision, technological feasibility, and customer interest. 
 
The status of this feature can be tracked using the following link. 
https://www.syncfusion.com/feedback/25198/support-to-validate-the-digital-signatures-in-an-existing-pdf-document  
 
Regards,  
Chinnu M