The YubiKey is a hardware token for authentication. The main mode of the YubiKey
is entering a one time password (or a strong static password) by acting as a USB HID device,
but there are things one can do with bi-directional communication:
- Configuration. The yubikey_config class should be a feature-wise complete implementation
of everything that can be configured on YubiKeys version 1.3 to 3.x (besides deprecated
functions in YubiKey 1.x). See examples/configure_nist_test_key for an example.
- Challenge-response. YubiKey 2.2 and later supports HMAC-SHA1 or Yubico challenge-response
operations. See examples/nist_challenge_response for an example.