Download Watchdata Driver



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TL;DR — go to Howto section to make WatchData PROXKey work with emSigner in GNU/Linux system.

Introduction

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Hardware tokens with digital signature are used for filing various financial documents in Govt of India portals. The major tokens supported by eMudhra are WatchData ProxKey, ePass 2003, Aladdin, Safenet, TrustKey etc. Many of these hardware tokens come (in CDROM image mode) with drivers and utilities to manage the signatures, unfortunately only in Windows platform.

Failed attempts

Sometime in 2017, I tried to make these tokens work for signing GST returns under GNU/Linux, using the de-facto pcsc tool. I got a WatchData PROXKey, which doesn’t work out-of-the-box with pcsc. Digging further brings up this report and it seems the driver is a spinoff of upstream (LGPL licensed), but no source code made available, so there is no hope of using these hardware tokens with upstream tools. The only option is depending on vendor provided drivers, unfortunately. There are some instructions by a retailer to get this working under Ubuntu.

Once you download and install that driver (ProxKey_Redhat.rpm), it does a few things — installs a separate pcsc daemon named pcscd_wd, installs the driver CCID bundles and certain supporting binaries/libraries. (The drawback of such custom driver implementations is that different drivers clash with each other (as each one provides a different pcscd_wd binary and their installation scripts silently overwrite existing files!). To avoid any clashes with this pcscd_wd daemon, disable the standard pcscd daemon by systemctl stop pcscd.service.

Plug in the USB hardware token and to the dismay observe that it spews the following error messages in journalctl:

This prompted me to try different drivers, mostly from the eMudhra repository — including eMudhra Watchdata, Trust Key and even ePass (there were no *New* drivers at this time) — none of them seemed to work. Many references were towards Ubuntu, so I tried various Ubuntu versions from 14.04 to 18.10, they didn’t yield different result either. At this point, I have put the endeavour in the back burner.

A renewed interest

Around 2019 September, KITE announced that they will start supporting government officials using digital signatures under GNU/Linux, as most of Kerala government offices now run on libre software. KITE have made the necessary drivers, signing tools and manuals available.

I tried this in a (recommended) Ubuntu 18.04 system, but the pcscd_wd errors persisted and NICDSign tool couldn’t recognize the PROXKey digital token. Although, their installation methods gave me a better idea of how these drivers are supposed to work with the signing middleware.

Couple of days ago, with better understanding of how these drivers work, I thought that these should also work in Fedora 30 system (which is my main OS), I set out for another attempt.

How to

Watchdata Token Driver Download

  1. Removed all the wdtokentool-proxkey, wdtokentool-trustkey, wdtokentool-eMudhra, ProxKey_Redhat and such drivers, if installed; to start from a clean slate.
  2. Download WatchData ProxKey (Linux) *New* driver from eMudhra.
  3. Unzip and install wdtokentool-ProxKey-1.1.1 RPM/DEB package. Note that this package installs the TRUSTKEY driver (/usr/lib/WatchData/TRUSTKEY/lib/libwdpkcs_TRUSTKEY.so), not ProxKey driver (/usr/lib/WatchData/ProxKey/lib/libwdpkcs_SignatureP11.so) and it seems the ProxKey token only works with TRUSTKEY driver!
  4. Start pcscd_wd.service by systemctl start pcscd_wd.service (only if not auto-started)
  5. Plug in your PROXKey token. (journalctl -f would still show the error message, but — lesson learned — this error can be safely ignored!)
  6. Download emsigner from GST website and unzip it into your ~/Documents or another directory (say ~/Documents/emSigner).
  7. Ensure port 1585 is open in firewall settings: firewall-cmd --add-port=1585/tcp --zone=FedoraWorkstation (adjust the firewall zone if necessary). Repeat the same command by adding --permanent to make this change effective across reboot).
  8. Go to ~/Documents/emSigner in shell and run ./startserver.sh (make sure to chmod 0755 startserver.sh, or double-click on this script from a file browser).
  9. Login to GST portal and try to file your return with DSC.
  10. f you get the error Failed to establish connection to the server. Kindly restart the Emsigner when trying to sign, open another tab in browser window and go to https://127.0.0.1:1585 and try signing again (don’t use localhost, as it would cause self-signed certificate mismatch).
  11. You should be prompted for the digital signature PIN and signing should succeed.

Watchdata Dsc Driver Download

Download Watchdata Driver

Download Watchdata Token Driver

Download

Watchdata Proxy Key Driver

It is possible to use this digital token also in Firefox (via Preferences → Privacy & Security → Certificates → Security Devices → Load with Module filename as /usr/lib/WatchData/TRUSTKEY/lib/libwdpkcs_TRUSTKEY.so) as long as the key is plugged in. Here again, you can skip the error message unable to load the module.