mcrypt_module_get_algo_key_size

(PHP 4 >= 4.0.2, PHP 5, PHP 7 < 7.2.0, PECL mcrypt >= 1.0.0)

mcrypt_module_get_algo_key_size — Returns the maximum supported keysize of the opened mode

Warning

This function has been DEPRECATED as of PHP 7.1.0 and REMOVED as of PHP 7.2.0. Relying on this function is highly discouraged.

function mcrypt_module_get_algo_key_size(string $algorithm, string $lib_dir = ?): int

Gets the maximum supported keysize of the opened mode.

algorithm: The algorithm name.
lib_dir: This optional parameter can contain the location where the mode module is on the system.

This function returns the maximum supported key size of the algorithm specified in bytes.