.. index:: single: otp
.. _otp/0:

.. rst-class:: right

**object**

``otp``
=======

HOTP and TOTP generation and verification predicates.

| **Availability:** 
|    ``logtalk_load(otp(loader))``

| **Author:** Paulo Moura
| **Version:** 1:0:0
| **Date:** 2026-07-14

| **Compilation flags:**
|    ``static, context_switching_calls``


| **Implements:**
|    ``public`` :ref:`otp_protocol <otp_protocol/0>`
| **Uses:**
|    :ref:`base32 <base32/0>`
|    :ref:`hmac <hmac/0>`
|    :ref:`list <list/0>`

| **Remarks:**
|    (none)

| **Inherited public predicates:**
|     :ref:`otp_protocol/0::hotp/5`  :ref:`otp_protocol/0::hotp_verify/7`  :ref:`otp_protocol/0::totp/5`  :ref:`otp_protocol/0::totp_verify/7`  

.. contents::
   :local:
   :backlinks: top

Public predicates
-----------------

(no local declarations; see entity ancestors if any)

Protected predicates
--------------------

(no local declarations; see entity ancestors if any)

Private predicates
------------------

(no local declarations; see entity ancestors if any)

Operators
---------

(none)

.. seealso::

   :ref:`base32 <base32/0>`, :ref:`hmac <hmac/0>`, :ref:`sha1 <sha1/0>`, :ref:`sha256 <sha256/0>`, :ref:`sha512_256 <sha512_256/0>`