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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.mcrypt-get-key-size" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>mcrypt_get_key_size</refname>
<refpurpose>Gets the key size of the specified cipher</refpurpose>
</refnamediv>
<refsynopsisdiv>
&warn.deprecated.function-7-1-0.removed-7-2-0;
</refsynopsisdiv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type class="union"><type>int</type><type>false</type></type><methodname>mcrypt_get_key_size</methodname>
<methodparam><type>int</type><parameter>cipher</parameter></methodparam>
</methodsynopsis>
<methodsynopsis>
<type class="union"><type>int</type><type>false</type></type><methodname>mcrypt_get_key_size</methodname>
<methodparam><type>string</type><parameter>cipher</parameter></methodparam>
<methodparam><type>string</type><parameter>mode</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>
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>.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>cipher</parameter></term>
<listitem>
&mcrypt.parameter.cipher;
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>mode</parameter></term>
<listitem>
&mcrypt.parameter.mode;
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns the maximum supported key size of the algorithm in bytes
&return.falseforfailure;.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>mcrypt_get_key_size</function> Example</title>
<programlisting role="php">
<![CDATA[
<?php
echo mcrypt_get_key_size('tripledes', 'ecb');
?>
]]>
</programlisting>
<para>
The example above shows how to use this function when
linked against libmcrypt 2.4.x or 2.5.x.
</para>
&example.outputs;
<screen>
<![CDATA[
24
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>mcrypt_get_block_size</function></member>
<member><function>mcrypt_enc_get_key_size</function></member>
<member><function>mcrypt_encrypt</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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