This project implements a validation server for Yubikey One-Time-Passwords. It is written in Tcl as CGI in order to be used with any CGI capable webserver - such as boa or apache2. It comes with a client library, although other client libraries are supported.

The server implementation is minimal and acts as a centralized validation server for small environments.

Features include:

• mostly Validation Protocol 2.0 compliant
• file based user and yubikey management; does not require any DBMS
• arbitrary keyboard layout support - Dvorak, Neo2 and QWERTY-alike layouts are supported by default, others - e.g. Russian - are supported with CFGFLAG_SEND_REF enabled
• client library with example