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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.9 $ -->
<refentry xml:id="function.mcrypt-get-key-size" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>mcrypt_get_key_size</refname>
<refpurpose>Get the key size of the specified cipher</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>mcrypt_get_key_size</methodname>
<methodparam><type>int</type><parameter>cipher</parameter></methodparam>
</methodsynopsis>
<methodsynopsis>
<type>int</type><methodname>mcrypt_get_key_size</methodname>
<methodparam><type>string</type><parameter>cipher</parameter></methodparam>
<methodparam><type>string</type><parameter>module</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 2.5.x.
</para>
<para>
<function>mcrypt_get_key_size</function> is used to get the size
of a key of the specified <parameter>cipher</parameter> (in
combination with an encryption mode).
</para>
<para>
This example shows how to use this function when linked against libmcrypt
2.4.x and 2.5.x. It is more useful to use the
<function>mcrypt_enc_get_key_size</function> function as this uses the
resource returned by <function>mcrypt_module_open</function>.
<example>
<title><function>mcrypt_get_block_size</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
echo mcrypt_get_key_size('tripledes', 'ecb');
?>
Prints:
24
]]>
</programlisting>
</example>
</para>
<para>
See also: <function>mcrypt_get_block_size</function>,
<function>mcrypt_end_get_key_size</function> and
<function>mcrypt_encrypt</function>.
</para>
</refsect1>
</refentry>
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