<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision$ -->
<refentry xml:id="function.mdecrypt-generic" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>mdecrypt_generic</refname>
  <refpurpose>Decrypt data</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>mdecrypt_generic</methodname>
   <methodparam><type>resource</type><parameter>td</parameter></methodparam>
   <methodparam><type>string</type><parameter>data</parameter></methodparam>
  </methodsynopsis>
  <para>
   This function decrypts data. Note that the length of the returned string
   can in fact be longer then the unencrypted string, due to the padding of
   the data.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>td</parameter></term>
     <listitem>
      <para>
       An encryption descriptor returned by
       <function>mcrypt_module_open</function>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>data</parameter></term>
     <listitem>
      <para>
       Encrypted data.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>mdecrypt_generic</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
    /* Data */
    $key = 'this is a very long key, even too long for the cipher';
    $plain_text = 'very important data';

    /* Open module, and create IV */
    $td = mcrypt_module_open('des', '', 'ecb', '');
    $key = substr($key, 0, mcrypt_enc_get_key_size($td));
    $iv_size = mcrypt_enc_get_iv_size($td);
    $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);

    /* Initialize encryption handle */
    if (mcrypt_generic_init($td, $key, $iv) != -1) {

        /* Encrypt data */
        $c_t = mcrypt_generic($td, $plain_text);
        mcrypt_generic_deinit($td);

        /* Reinitialize buffers for decryption */
        mcrypt_generic_init($td, $key, $iv);
        $p_t = mdecrypt_generic($td, $c_t);

        /* Clean up */
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
    }

    if (strncmp($p_t, $plain_text, strlen($plain_text)) == 0) {
        echo "ok\n";
    } else {
        echo "error\n";
    }
?>
]]>
    </programlisting>
   </example>
  </para>
  <para>
   The above example shows how to check if the data before the encryption is
   the same as the data after the decryption. It is very important to
   reinitialize the encryption buffer with
   <function>mcrypt_generic_init</function> before you try to decrypt the
   data.
  </para>
  <para>
   The decryption handle should always be initialized with
   <function>mcrypt_generic_init</function> with a key and an IV before
   calling this function. Where the encryption is done, you should free the
   encryption buffers by calling <function>mcrypt_generic_deinit</function>.
   See <function>mcrypt_module_open</function> for an example.
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>mcrypt_generic</function></member>
    <member><function>mcrypt_generic_init</function></member>
    <member><function>mcrypt_generic_deinit</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->