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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.hash-hmac" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>hash_hmac</refname>
<refpurpose>Generate a keyed hash value using the HMAC method</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>string</type><methodname>hash_hmac</methodname>
<methodparam><type>string</type><parameter>algo</parameter></methodparam>
<methodparam><type>string</type><parameter>data</parameter></methodparam>
<methodparam><modifier role="attribute">#[\SensitiveParameter]</modifier><type>string</type><parameter>key</parameter></methodparam>
<methodparam choice="opt"><type>bool</type><parameter>binary</parameter><initializer>&false;</initializer></methodparam>
</methodsynopsis>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>algo</parameter></term>
<listitem>
<para>
Name of selected hashing algorithm (e.g. <literal>"sha256"</literal>).
For a list of supported algorithms see <function>hash_hmac_algos</function>.
<note>
<para>
Non-cryptographic hash functions are not allowed.
</para>
</note>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>data</parameter></term>
<listitem>
<para>
Message to be hashed.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>key</parameter></term>
<listitem>
<para>
Shared secret key used for generating the HMAC variant of the message digest.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>binary</parameter></term>
<listitem>
<para>
When set to &true;, outputs raw binary data.
&false; outputs lowercase hexits.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns a string containing the calculated message digest as lowercase hexits
unless <parameter>binary</parameter> is set to true in which case the raw
binary representation of the message digest is returned.
</para>
</refsect1>
<refsect1 role="errors">
&reftitle.errors;
<para>
Throws a <classname>ValueError</classname> exception if
<parameter>algo</parameter> is unknown or is a non-cryptographic hash
function.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>8.0.0</entry>
<entry>
Now throws a <classname>ValueError</classname> exception if
<parameter>algo</parameter> is unknown or is a
non-cryptographic hash function; previously, &false; was returned instead.
</entry>
</row>
<row>
<entry>7.2.0</entry>
<entry>Usage of non-cryptographic hash functions (adler32, crc32, crc32b, fnv132, fnv1a32, fnv164, fnv1a64, joaat) was disabled.</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>hash_hmac</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
echo hash_hmac('sha256', 'The quick brown fox jumped over the lazy dog.', 'secret');
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
9c5c42422b03f0ee32949920649445e417b2c634050833c5165704b825c2a53b
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>hash_hmac_algos</function></member>
<member><function>hash_hmac_file</function></member>
<member><function>hash_equals</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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