digital sign



i need help with "digital sign" and p7m files.
i need to build a tool that have to complete these task:

web app:

-user download document on a server
-read digital sign from smart card (on client)
-add sign to the document
-upload to server signed document

is it possible ???
How can i accomplish it ?

smart client,hosted com in ie aren't problem ...
i need info oon read smart card and add sign!

Is possibile to read "digital sign" from smart card
and send it to server, so server can complete task ... ???

thank so much for help


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