php-doc-en/reference/mcrypt/functions/mcrypt-encrypt.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.mcrypt-encrypt" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>mcrypt_encrypt</refname>
  <refpurpose>Encrypts plaintext with given parameters</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>mcrypt_encrypt</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>string</type><parameter>mode</parameter></methodparam>
   <methodparam choice="opt"><type>string</type><parameter>iv</parameter></methodparam>
  </methodsynopsis>
  <para>
   Encrypts the data and returns it.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>cipher</parameter></term>
     <listitem>
      &mcrypt.parameter.cipher;
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>key</parameter></term>
     <listitem>
      <para>
       The key with which the data will be encrypted. If it's smaller than
       the required keysize, it is padded with '<literal>\0</literal>'. It is
       better not to use ASCII strings for keys.
      </para>
      <para>
       It is recommended to use the mhash functions to create a key from a
       string.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>data</parameter></term>
     <listitem>
      <para>
       The data that will be encrypted with the given <parameter>cipher</parameter>
       and <parameter>mode</parameter>. If the size of the data is not n * blocksize,
       the data will be padded with '<literal>\0</literal>'.
      </para>
      <para>
       The returned crypttext can be larger than the size of the data that was
       given by <parameter>data</parameter>.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>mode</parameter></term>
     <listitem>
      &mcrypt.parameter.mode;
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>iv</parameter></term>
     <listitem>
      &mcrypt.parameter.iv;
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the encrypted data, as a string.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>mcrypt_encrypt</function> Example</title>
    <programlisting role="php">
<![CDATA[
<?php
    $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
    $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
    $key = "This is a very secret key";
    $text = "Meet me at 11 o'clock behind the monument.";
    echo strlen($text) . "\n";

    $crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_ECB, $iv);
    echo strlen($crypttext) . "\n";
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
42
64
]]>
    </screen>
   </example>
  </para>
  <para>
   See also <function>mcrypt_module_open</function> for a more advanced API
   and an example.
  </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
-->