This guide will help you install all required files and applications for using a B-Trust QES under Linux.

Installing the required applications

First, we need to install the applications that will interact with the card reader. These are:

  1. OpenSC - Gentoo/Funtoo: root # emerge opensc
  2. PCSC-lite - Gentoo/Funtoo: root # emerge pcsc-lite

Next, start the pcscd service on boot:

root # rc-update pcscd add pcscd default

or the following for systemd:

root # systemctl systemctl enable pcscd

Enable hotreloading by adding the following line to /etc/rc.conf if on OpenRC:


Add yourself to the pcscd group and add it to the usb group:

root # usermod -a -G pcscd <user>
root # usermod -a -G usb pcscd

Reboot your PC.

Install AB Circle CCID drivers

Many CCID readers in Bulgaria are made by a company, known as COMITEX, which produces readers such as the CCR7115B, which is quite popular. These readers use hardware made by AB Circle. They provide source tarballs, however the easiest way is to download a tarball obtained by invakid404’s webscraper through invakid404’s GitHub repository’s releases.

Funtoo/Gentoo users can get an autogen and an ebuild from here.

To compile manually, extract all tarballs recursively, then enter Circle_USB_Linux_Mac_Driver_v<version here>/abcccid-<version here>/ and run the following:

user $ ./configure
user $ make -j <number of jobs>
root # make install
root # cp src/92_pcscd_abcccid.rules /etc/udev/rules.d/

Installing the required certificates


They are pre-installed for Chromium-based browsers


You have to download and install the following certificates in firefox:


Install QES for Firefox

Go to Settings -> Privacy and Security -> Certificates -> Security devices.

Click on the load button and load the /usr/lib64/pkcs11/ library.

You should be able to click the login button and enter you PIN code.

If everything is done correctly, you should be able to log into a site, like If everything is successfull, you will be asked for your QES PIN code and redirected further.

Otherwise, an SSL_ERROR_HANDSHAKE_FAILURE_ALERT error will be returned.

Install BISS

To digitally sign documents, you also need the BISS(Browser Independend Signing Service). You can download a tarball here. Simply copy the files into your /usr/local or ~/.local directories and create a symlink from <prefix>/opt/btrustbiss/bin/BISS to a binary directory, like /usr/local/bin or ~/.local/bin.

You can use an ebuild, like the one here to easily install it on Gentoo/Funtoo systems. Note dependencies are not set, so you may lack some dependencies when compiling.

Once installed, you can run user $ BISS and once running successfully you can try signing a file here.