oath-toolkit 2.6.2 One-time password (OTP) components
The OATH (Open AuTHentication) Toolkit provides various components for building one-time password (OTP) authentication systems:
oathtool, a command-line tool for generating & validating OTPs.
liboath, a C library for OATH handling.
pam_oath, a PAM module for pluggable login authentication.
Supported technologies include the event-based HOTP algorithm (RFC4226) and the time-based TOTP algorithm (RFC6238).