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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.2 $ -->
<appendix xml:id="mcrypt.examples" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
&reftitle.examples;
<para>
Mcrypt can be used to encrypt and decrypt using the above
mentioned ciphers. If you linked against libmcrypt-2.2.x, the
four important mcrypt commands (<function>mcrypt_cfb</function>,
<function>mcrypt_cbc</function>, <function>mcrypt_ecb</function>,
and <function>mcrypt_ofb</function>) can operate in both modes
which are named MCRYPT_ENCRYPT and MCRYPT_DECRYPT, respectively.
<example>
<title>Encrypt an input value with TripleDES under 2.2.x in ECB mode</title>
<programlisting role="php">
<![CDATA[
<?php
$key = "this is a secret key";
$input = "Let us meet at 9 o'clock at the secret place.";
$encrypted_data = mcrypt_ecb (MCRYPT_3DES, $key, $input, MCRYPT_ENCRYPT);
?>
]]>
</programlisting>
</example>
This example will give you the encrypted data as a string in
<literal>$encrypted_data</literal>.
</para>
<para>
If you linked against libmcrypt 2.4.x or 2.5.x, these functions are still
available, but it is recommended that you use the advanced functions.
<example>
<title>Encrypt an input value with TripleDES under 2.4.x and higher in ECB mode</title>
<programlisting role="php">
<![CDATA[
<?php
$key = "this is a secret key";
$input = "Let us meet at 9 o'clock at the secret place.";
$td = mcrypt_module_open('tripledes', '', 'ecb', '');
$iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
mcrypt_generic_init($td, $key, $iv);
$encrypted_data = mcrypt_generic($td, $input);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
?>
]]>
</programlisting>
</example>
This example will give you the encrypted data as a string in
<literal>$encrypted_data</literal>. For a full example see
<function>mcrypt_module_open</function>.
</para>
</appendix>
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