mcrypt_module_get_supported_key_sizes Returns an array with the supported keysizes of the opened algorithm &reftitle.description; arraymcrypt_module_get_supported_key_sizes stringalgorithm stringlib_dir Returns an array with the key sizes supported by the specified algorithm. If it returns an empty array then all key sizes between 1 and mcrypt_module_get_algo_key_size are supported by the algorithm. &reftitle.parameters; algorithm The algorithm to used. lib_dir The optional lib_dir parameter can contain the location of where the algorithm module is on the system. &reftitle.returnvalues; Returns an array with the key sizes supported by the specified algorithm. If it returns an empty array then all key sizes between 1 and mcrypt_module_get_algo_key_size are supported by the algorithm. &reftitle.seealso; mcrypt_enc_get_supported_key_sizes