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Returns an array with the supported keysizes of the opened algorithm (PHP 4 >= 4.0.2, PHP 5)
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.

See also mcrypt_enc_get_supported_key_sizes() which is used on open encryption modules.