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<refentry xml:id="function.mcrypt-cfb" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>mcrypt_cfb</refname>
  <refpurpose>Encrypt/decrypt data in CFB mode</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>mcrypt_cfb</methodname>
   <methodparam><type>int</type><parameter>cipher</parameter></methodparam>
   <methodparam><type>string</type><parameter>key</parameter></methodparam>
   <methodparam><type>string</type><parameter>data</parameter></methodparam>
   <methodparam><type>int</type><parameter>mode</parameter></methodparam>
   <methodparam><type>string</type><parameter>iv</parameter></methodparam>
  </methodsynopsis>
  <methodsynopsis>
   <type>string</type><methodname>mcrypt_cfb</methodname>
   <methodparam><type>string</type><parameter>cipher</parameter></methodparam>
   <methodparam><type>string</type><parameter>key</parameter></methodparam>
   <methodparam><type>string</type><parameter>data</parameter></methodparam>
   <methodparam><type>int</type><parameter>mode</parameter></methodparam>
   <methodparam choice="opt"><type>string</type><parameter>iv</parameter></methodparam>
  </methodsynopsis>
  <para>
   The first prototype is when linked against libmcrypt 2.2.x, the
   second when linked against libmcrypt 2.4.x or higher. The
   <parameter>mode</parameter> should be either
   <constant>MCRYPT_ENCRYPT</constant> or
   <constant>MCRYPT_DECRYPT</constant>.
  </para>
  <para>
   This function should not be used anymore, see
   <function>mcrypt_generic</function> and
   <function>mdecrypt_generic</function> for replacements.
  </para>
 </refsect1>
</refentry>

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