mcrypt_module_open Opens the module of the algorithm and the mode to be used &reftitle.description; resourcemcrypt_module_open stringalgorithm stringalgorithm_directory stringmode stringmode_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. &reftitle.parameters; algorithm The algorithm to be used. algorithm_directory The algorithm_directory parameter is used to locate the encryption module. When you supply a directory name, it is used. When you set it to an empty string (""), the value set by the mcrypt.algorithms_dir &php.ini; directive is used. When it is not set, the default directory that is used is the one that was compiled into libmcrypt (usually /usr/local/lib/libmcrypt). mode The mode to be used. mode_directory The mode_directory parameter is used to locate the encryption module. When you supply a directory name, it is used. When you set it to an empty string (""), the value set by the mcrypt.modes_dir &php.ini; directive is used. When it is not set, the default directory that is used is the one that was compiled-in into libmcrypt (usually /usr/local/lib/libmcrypt). &reftitle.returnvalues; Normally it returns an encryption descriptor, or &false; on error. &reftitle.examples; ]]> The first line in the example above will try to open the DES cipher from the default directory and the ECB 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. ]]> &reftitle.seealso; mcrypt_module_close mcrypt_generic mdecrypt_generic mcrypt_generic_init mcrypt_generic_deinit