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# mcrypt_module_get_supported_key_sizes

(PHP 4 >= 4.0.2)

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

## Description

``array mcrypt_module_get_supported_key_sizes` (string algorithm [, string lib_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. The optional `lib_dir` parameter can contain the location where the mode module is on the system.

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