2002-04-15 00:12:54 +00:00
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<?xml version="1.0" encoding="iso-8859-1"?>
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2002-04-17 06:45:35 +00:00
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<!-- $Revision: 1.2 $ -->
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2002-04-15 00:12:54 +00:00
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<!-- splitted from ./en/functions/mcrypt.xml, last change in rev 1.2 -->
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<refentry id="function.mcrypt-create-iv">
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<refnamediv>
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<refname>mcrypt_create_iv</refname>
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<refpurpose>
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Create an initialization vector (IV) from a random source
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</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>string</type><methodname>mcrypt_create_iv</methodname>
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<methodparam><type>int</type><parameter>size</parameter></methodparam>
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<methodparam><type>int</type><parameter>source</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>mcrypt_create_iv</function> is used to create an IV.
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</para>
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<para>
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<function>mcrypt_create_iv</function> takes two arguments,
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<parameter>size</parameter> determines the size of the IV,
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<parameter>source</parameter> specifies the source of the IV.
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</para>
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<para>
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The source can be MCRYPT_RAND (system random number generator),
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MCRYPT_DEV_RANDOM (read data from /dev/random) and
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MCRYPT_DEV_URANDOM (read data from /dev/urandom). If you use
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MCRYPT_RAND, make sure to call srand() before to initialize the
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random number generator.
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</para>
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<para>
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<example>
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<title><function>mcrypt_create_iv</function> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$cipher = MCRYPT_TripleDES;
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$block_size = mcrypt_get_block_size ($cipher);
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$iv = mcrypt_create_iv ($block_size, MCRYPT_DEV_RANDOM);
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?>
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]]>
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</programlisting>
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</example>
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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