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<refentry xml:id="function.mcrypt-enc-get-iv-size" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>mcrypt_enc_get_iv_size</refname>
  <refpurpose>Returns the size of the IV of the opened algorithm</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>mcrypt_enc_get_iv_size</methodname>
   <methodparam><type>resource</type><parameter>td</parameter></methodparam>
  </methodsynopsis>
  <para>
   This function returns the size of the IV of the algorithm specified by the
   encryption descriptor in bytes. An IV is used in cbc, cfb and ofb modes,
   and in some algorithms in stream mode.
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>td</parameter></term>
     <listitem>
      <para>
       The encryption descriptor.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the size of the IV, or 0 if the IV is ignored in the algorithm.
  </para>
 </refsect1>
</refentry>

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