php-doc-en/reference/hash/functions/hash-hmac-file.xml

<?xml version="1.0" encoding="iso-8859-1"?>
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<refentry id="function.hash-hmac-file">
 <refnamediv>
  <refname>hash_hmac_file</refname>
  <refpurpose>Generate a keyed hash value using the HMAC method and the contents of a given file</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>hash_hmac_file</methodname>
   <methodparam><type>string</type><parameter>algo</parameter></methodparam>
   <methodparam><type>string</type><parameter>filename</parameter></methodparam>
   <methodparam><type>string</type><parameter>key</parameter></methodparam>
   <methodparam choice="opt"><type>bool</type><parameter>raw_output</parameter></methodparam>
  </methodsynopsis>

 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>algo</parameter></term>
     <listitem>
      <para>
       Name of selected hashing algorithm (i.e. "md5", "sha256", "haval160,4", etc..)
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>filename</parameter></term>
     <listitem>
      <para>
       URL describing location of file to be hashed; Supports fopen wrappers.
      </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>raw_output</parameter></term>
     <listitem>
      <para>
       When set to &true;, outputs raw binary data.
       Default value (&false;) outpus 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>raw_output</parameter> is set to true in which case the raw
   binary representation of the message digest is returned.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>hash_hmac_file</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
/* Create a file to calculate hash of */
file_put_contents('example.txt', 'The quick brown fox jumped over the lazy dog.');

echo hash_hmac_file('md5', 'example.txt', 'secret');
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
7eb2b5c37443418fc77c136dd20e859c
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>hash_hmac</function></member>
    <member>Or <function>hash_file</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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