# mcrypt_module_open

(PHP 4 >= 4.0.2, PHP 5)

mcrypt_module_open — Opens the module of the algorithm and the mode to be used

### Description

resource mcrypt_module_open ( string `$algorithm` , string `$algorithm_directory` , string `$mode` , string `$mode_directory` )

This function opens the module of the algorithm and the mode to be used. The name of the algorithm is specified in algorithm, e.g. "twofish" or is one of the MCRYPT_ciphername constants. The module is closed by calling mcrypt_module_close(). Normally it returns an encryption descriptor, or `FALSE` on error.

The `algorithm_directory` and `mode_directory` are used to locate the encryption modules. When you supply a directory name, it is used. When you set one of these to the empty string (""), the value set by the `mcrypt.algorithms_dir` or `mcrypt.modes_dir` ini-directive is used. When these are not set, the default directories that are used are the ones that were compiled in into libmcrypt (usually /usr/local/lib/libmcrypt).

Example#1 mcrypt_module_open() examples

`<?php
$td = mcrypt_module_open(MCRYPT_DES, '',
MCRYPT_MODE_ECB, '/usr/lib/mcrypt-modes');
$td = mcrypt_module_open('rijndael-256', '', 'ofb', '');
?>`

The first line in the example above will try to open the DES cipher from the default directory and the EBC mode from the directory /usr/lib/mcrypt-modes. The second example uses strings as name for the cipher and mode, this only works when the extension is linked against libmcrypt 2.4.x or 2.5.x.

Example#2 Using mcrypt_module_open() in encryption

`<?php
/* Open the cipher */
$td = mcrypt_module_open('rijndael-256', '', 'ofb', '');
/* Create the IV and determine the keysize length, use MCRYPT_RAND
* on Windows instead */
$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_DEV_RANDOM);
$ks = mcrypt_enc_get_key_size($td);
/* Create key */
$key = substr(md5('very secret key'), 0, $ks);
/* Intialize encryption */
mcrypt_generic_init($td, $key, $iv);
/* Encrypt data */
$encrypted = mcrypt_generic($td, 'This is very important data');
/* Terminate encryption handler */
mcrypt_generic_deinit($td);
/* Initialize encryption module for decryption */
mcrypt_generic_init($td, $key, $iv);
/* Decrypt encrypted string */
$decrypted = mdecrypt_generic($td, $encrypted);
/* Terminate decryption handle and close module */
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
/* Show string */
echo trim($decrypted) . "\n";
?>`

See also mcrypt_module_close(), mcrypt_generic(), mdecrypt_generic(), mcrypt_generic_init(), and mcrypt_generic_deinit().