Reads a secret key, base32-encoded, and outputs TOTP (Time-based One Time Password) as defined in https://datatracker.ietf.org/doc/html/rfc6238
Typical usage:
% cat /path/to/secret/key.txt | totp
For example:
% cat example_key.txt | totp
012359%
Supported flags are (all optional):
% totp
Usage of totp:
-digits int
number of digits (default 6)
-t string
timestamp (T) as Unix epoch (default current-timestmp)
-t0 int
start timestamp (T0) as Unix epoch (default 0)
-x int
time step in seconds (X) (default 30)
The totp-swiftbar.sh is an example script of how to use this tool with the awesome SwiftBar
Public domain