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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.2 $ -->
<!-- splitted from ./en/functions/mcrypt.xml, last change in rev 1.7 -->
<refentry id="function.mcrypt-enc-get-iv-size">
<refnamediv>
<refname>mcrypt_enc_get_iv_size</refname>
<refpurpose>Returns the size of the IV of the opened algorithm</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>int</type><methodname>mcrypt_enc_get_iv_size</methodname>
<methodparam><type>resource</type><parameter>td</parameter></methodparam>
</methodsynopsis>
<para>
This function returns the size of the iv of the algorithm
specified by the encryption descriptor in bytes. If it returns
'0' then the IV is ignored in the algorithm. An IV is used in
cbc, cfb and ofb modes, and in some algorithms in stream mode.
</para>
</refsect1>
</refentry>
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