I have a question regarding the features I’m looking for. We have two scenarios:
1) Checking for existing digital signatures:
A PDF document is uploaded to our solution (it’s a server side solution) We then have to check if it has a digital signature or not If it has a digital signature, we have to validate the signature and extract basic info (name etc.) regarding the person who own the signature
2) Adding signatures to a new PDF document:
The user select a PDF file for signing The users existing X509-based certificate is used (the user is queried for a password to use the signature) The document is signed
First thank you for considering aspose product. now aspose.pdf.kit support signaturing a pdf document with X509-based certificate. you can refer to the class PdfFileSignature.cs.the example code is as below.
But the kit does not support the the feature about Checking for existing digital signatures. we will investigate the feature and plan to support the feature . When this feature is supported, I will inform you.