Hi Pajout

Of course. The code I'm faced with is PHP, but I think Perl is probably more suited to the tasks such as this where text parsing is involved, hence the post here.

The code I am looking at refactoring for a specific application is published open-source by Yubikey on Github, so the relevant files are as follows:

https://raw.githubusercontent.com/Yubico/yubikey-val/master/ykval-verify.php

https://raw.githubusercontent.com/Yubico/yubikey-val/master/ykval-common.php

https://raw.githubusercontent.com/Yubico/yubikey-val/master/ykval-synclib.php

So synclib and common are the libraries, and verify is the main file.