Veryfy web form details with Digital Signature in ASP .NET

Most of the web applications require Digital Signing pdf documents, files, eReturns (XML or JSON) etc, from user’s Browser using user’s local machine Key-store, USB Token or Smartcard.

 

Also in most of the signing scenarios, for requirement to protect data within the server boundaries, it’s not recommended to send complete pdf file or data to browser or to signing API server.

 

Thus, its good practice, to use JavaScript through browser extension to access some application running on local system to access local KeyStore and produce the signature and send back (PKCS7 or CMS container in case of PDF signing) to server where the signature may be injected back to PDF or eReturn from which hash was created for signing and was sent to browser.

 

For browser based signing scenarios, one such free Chrome extension available is Signer.Digital chrome extension. Local system (host running behind the chrome browser on windows) may be downloaded from https://download.cnet.com/Signer-Digital-Chrome-Extension/3000-33362_4-78042540.html Installing this host and restarting Chrome will automatically add Signer.Digital Chrome Extension

 

Sample JavaScript and Server side pseudocode code to sign GST return using Signer.Digital Extension is available at http://help.signer.digital/digital_signing_and_authentication_from_web_browser.htm

 

On sample JavaScript:

 

function getSignature(hash){

//Sign GSTR Return Hash using Signer.Digital Chrome Extension

//This method returns CMS (PKCS7) Signature

SignerDigital.signGstHash(hash)

.then(function(signature){

//send signature to return filing server

},function(error){

//send error to server and/or report error to user

});

}

//For Income Tax Return signing use method:

//This method returns SHA256 Signature

SignerDigital.signITHash(hash, PAN)

this link is helpful for your question

http://forums.asp.net/t/1992897.aspx?How+to+add+a+digital+signature+to+an+application

Hi,

Please follow this Link,

http://www.fryan0911.com/2009/04/c-how-to-sign-and-verify-digital.html

https://blogs.msdn.microsoft.com/alejacma/2008/06/25/how-to-sign-and-verify-the-signature-with-net-and-a-certificate-c/

http://collageprogramming.blogspot.in/2013/03/how-to-use-digital-signature-in-aspnet.html