mirror of
https://github.com/sigmasternchen/php-doc-en
synced 2025-03-19 10:28:54 +00:00
f8bd23e2bb
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@146741 c90b9560-bf6c-de11-be94-00142212c4b1
75 lines
2.9 KiB
XML
75 lines
2.9 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
|
|
<!-- $Revision: 1.6 $ -->
|
|
<!-- splitted from ./en/functions/mcrypt.xml, last change in rev 1.7 -->
|
|
<refentry id="function.mcrypt-generic">
|
|
<refnamediv>
|
|
<refname>mcrypt_generic</refname>
|
|
<refpurpose>This function encrypts data</refpurpose>
|
|
</refnamediv>
|
|
<refsect1>
|
|
<title>Description</title>
|
|
<methodsynopsis>
|
|
<type>string</type><methodname>mcrypt_generic</methodname>
|
|
<methodparam><type>resource</type><parameter>td</parameter></methodparam>
|
|
<methodparam><type>string</type><parameter>data</parameter></methodparam>
|
|
</methodsynopsis>
|
|
<para>
|
|
This function encrypts data. The data is padded with "<literal>\0</literal>"
|
|
to make sure the length of the data is n * blocksize. This
|
|
function returns the encrypted data. Note that the length
|
|
of the returned string can in fact be longer then the input,
|
|
due to the padding of the data.
|
|
</para>
|
|
<para>
|
|
If you want to store the encrypted data in a database make sure to store
|
|
the entire string as returned by mcrypt_generic, or the string will not
|
|
entirely decrypt properly. If your original string is 10 characters long
|
|
and the block size is 8 (use
|
|
<function>mcrypt_enc_get_block_size</function> to determine the
|
|
blocksize), you would need at least 16 characters in your database field.
|
|
Note the string returned by <function>mdecrypt_generic</function> will be
|
|
16 characters as well...use <function>rtrim</function>($str, "\0") to
|
|
remove the padding.
|
|
</para>
|
|
<para>
|
|
If you are for example storing the data in a MySQL database remember that
|
|
varchar fields automatically have trailing spaces removed during
|
|
insertion. As encrypted data can end in a space (ASCII 32), the data will
|
|
be damaged by this removal. Store data in a tinyblob/tinytext (or
|
|
larger) field instead.
|
|
</para>
|
|
<para>
|
|
The encryption handle should always be initialized with
|
|
<function>mcrypt_generic_init</function> with a key and an IV before
|
|
calling this function. Where the encryption is done, you should free the
|
|
encryption buffers by calling <function>mcrypt_generic_deinit</function>.
|
|
See <function>mcrypt_module_open</function> for an example.
|
|
</para>
|
|
<para>
|
|
See also <function>mdecrypt_generic</function>,
|
|
<function>mcrypt_generic_init</function>, and
|
|
<function>mcrypt_generic_deinit</function>.
|
|
</para>
|
|
</refsect1>
|
|
</refentry>
|
|
|
|
<!-- Keep this comment at the end of the file
|
|
Local variables:
|
|
mode: sgml
|
|
sgml-omittag:t
|
|
sgml-shorttag:t
|
|
sgml-minimize-attributes:nil
|
|
sgml-always-quote-attributes:t
|
|
sgml-indent-step:1
|
|
sgml-indent-data:t
|
|
indent-tabs-mode:nil
|
|
sgml-parent-document:nil
|
|
sgml-default-dtd-file:"../../../../manual.ced"
|
|
sgml-exposed-tags:nil
|
|
sgml-local-catalogs:nil
|
|
sgml-local-ecat-files:nil
|
|
End:
|
|
vim600: syn=xml fen fdm=syntax fdl=2 si
|
|
vim: et tw=78 syn=sgml
|
|
vi: ts=1 sw=1
|
|
-->
|