cl-one-time-passwords
One time passwords (hotp rfc4226, totp rfc6238) as used in two factor authentication systems such as Google's.
$ area51 add cl-one-time-passwordsCopyUsage
;; area51 add updates your .asd automatically.
;; Use the package in your code:
(in-package :my-project)
(cl-one-time-passwords:some-function ...)