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mcrypt_module_get_algo_supported_key_sizes -- Returns an array with the supported keysizes of the opened algorithmarray mcrypt_module_enc_get_algo_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.