.. index:: single: http_digest_verifier_protocol
.. _http_digest_verifier_protocol/0:

.. rst-class:: right

**protocol**

``http_digest_verifier_protocol``
=================================

Protocol for HTTP Digest authentication verifiers backed by stored HA1 values.

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

| **Author:** Paulo Moura
| **Version:** 1:0:0
| **Date:** 2026-05-29

| **Compilation flags:**
|    ``static``


| **Dependencies:**
|   (none)


| **Remarks:**
|    (none)

| **Inherited public predicates:**
|    (none)

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

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

.. index:: ha1/4
.. _http_digest_verifier_protocol/0::ha1/4:

``ha1/4``
^^^^^^^^^

Returns the stored lowercase hexadecimal HA1 value for the given normalized digest algorithm family, realm, and username. Fails when the user is unknown for the realm.

| **Compilation flags:**
|    ``static``

| **Template:**
|    ``ha1(Algorithm,Realm,Username,HA1)``
| **Mode and number of proofs:**
|    ``ha1(+atom,++atom,++atom,-atom)`` - ``zero_or_one``


------------

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

(none)

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

(none)

Operators
---------

(none)