php-doc-en/reference/mcrypt/functions/mcrypt-module-get-algo-key-size.xml

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<refentry xml:id="function.mcrypt-module-get-algo-key-size" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>mcrypt_module_get_algo_key_size</refname>
  <refpurpose>Returns the maximum supported keysize of the opened mode</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>mcrypt_module_get_algo_key_size</methodname>
   <methodparam><type>string</type><parameter>algorithm</parameter></methodparam>
   <methodparam choice="opt"><type>string</type><parameter>lib_dir</parameter></methodparam>
  </methodsynopsis>
  <para>
   Gets the maximum supported keysize of the opened mode.
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>algorithm</parameter></term>
     <listitem>
      <para>
       The algorithm name.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>lib_dir</parameter></term>
     <listitem>
      <para>
       This optional parameter can contain the location where the mode module
       is on the system.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   This function returns the maximum supported key size of the
   algorithm specified in bytes.
  </para>
 </refsect1>
</refentry>

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