php-doc-en/reference/mcrypt/functions/mcrypt-enc-get-supported-key-sizes.xml

<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.4 $ -->
<!-- splitted from ./en/functions/mcrypt.xml, last change in rev 1.7 -->
  <refentry id="function.mcrypt-enc-get-supported-key-sizes">
   <refnamediv>
    <refname>mcrypt_enc_get_supported_key_sizes</refname>
    <refpurpose>Returns an array with the supported keysizes of the opened algorithm</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>array</type><methodname>mcrypt_enc_get_supported_key_sizes</methodname>
      <methodparam><type>resource</type><parameter>td</parameter></methodparam>
     </methodsynopsis>
    <para>
     Returns an array with the key sizes supported by the algorithm
     specified by the encryption descriptor. If it returns an empty
     array then all key sizes between 1 and
     <function>mcrypt_enc_get_key_size</function> are supported by the
     algorithm.
    </para>
    <para>
     <example>
      <title><function>mcrypt_enc_get_supported_key_sizes</function> example</title>
      <programlisting role="php">
<![CDATA[
<?php
    $td = mcrypt_module_open('rijndael-256', '', 'ecb', '');
    var_dump(mcrypt_enc_get_supported_key_sizes($td));
?>
]]>
      </programlisting>
      <para>
       This will print:
      </para>
      <screen>
<![CDATA[
array(3) {
  [0]=>
  int(16)
  [1]=>
  int(24)
  [2]=>
  int(32)
}
]]>
      </screen>
     </example>
    </para>
   </refsect1>
  </refentry>

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