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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@149073 c90b9560-bf6c-de11-be94-00142212c4b1
82 lines
2.6 KiB
XML
82 lines
2.6 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.9 $ -->
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<!-- splitted from ./en/functions/mcrypt.xml, last change in rev 1.7 -->
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<refentry id="function.mcrypt-get-iv-size">
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<refnamediv>
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<refname>mcrypt_get_iv_size</refname>
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<refpurpose>
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Returns the size of the IV belonging to a specific cipher/mode combination
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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>int</type><methodname>mcrypt_get_iv_size</methodname>
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<methodparam><type>string</type><parameter>cipher</parameter></methodparam>
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<methodparam><type>string</type><parameter>mode</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>mcrypt_get_iv_size</function> returns the size of
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the Initialisation Vector (IV) in bytes. On error the function
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returns &false;. If the IV is ignored in the specified cipher/mode
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combination zero is returned.
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</para>
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<para>
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<parameter>cipher</parameter> is one of the MCRYPT_ciphername
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constants of the name of the algorithm as string.
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</para>
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<para>
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<parameter>mode</parameter> is one of the MCRYPT_MODE_modename constants
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or one of "ecb", "cbc", "cfb", "ofb", "nofb" or "stream". The IV is
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ignored in ECB mode as this mode does not require it. You will need to
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have the same IV (think: starting point) both at encryption and
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decryption stages, otherwise your encryption will fail.
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</para>
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<para>
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It is more useful to use the <function>mcrypt_enc_get_iv_size</function>
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function as this uses the resource returned by
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<function>mcrypt_module_open</function>.
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</para>
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<para>
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<example>
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<title><function>mcrypt_get_iv_size</function> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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echo mcrypt_get_iv_size(MCRYPT_CAST_256, MCRYPT_MODE_CFB) . "\n";
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echo mcrypt_get_iv_size('des', 'ecb') . "\n";
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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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<para>
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See also
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<function>mcrypt_get_block_size</function>,
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<function>mcrypt_enc_get_iv_size</function> and
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<function>mcrypt_create_iv</function>.
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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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