This is an implementation of the Yubico OTP algorithm, used on YubiKey devices. The primary audience is developers who wish to verify YubiKey tokens in their applications, presumably as part of a multi-factor authentication scheme. Note that this is not a YubiCloud client, it's the low-level implementation. Those wishing to verify YubiKey tokens in their application will be most interested in yubiotp.otp.decode_otp.

For testing and experimenting, the included yubikey script simulates one or more YubiKey devices using a config file. It also includes utility commands such as a modhex converter. See yubikey -h for details.