# mcrypt_module_get_supported_key_sizes

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

mcrypt_module_get_supported_key_sizes — Returns an array with the supported keysizes of the opened algorithm

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.

### Description

mcrypt_module_get_supported_key_sizes ( string `$algorithm` [, string `$lib_dir` ] ) : array

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.

### Parameters

`algorithm`

  The algorithm to be used.

`lib_dir`

  The optional `lib_dir` parameter can contain the location where the algorithm module is on the system.

### Return Values

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.

### See Also

- mcrypt_enc_get_supported_key_sizes() - Returns an array with the supported keysizes of the opened algorithm