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The getParams method provided by the interface implementations is useful for obtaining and extracting the parameters from the keys and then using the parameters , for example as parameters to the DSAParameterSpec constructor called to create a parameter specification from parameter values that could be used to initialize a KeyPairGenerator object for DSA . In order to ensure that the size of these structures is correct even with a dynamically linked libpng , there are functions to initialize and allocate the structures . In some cases , it initializes this variable and in others it expects you to initialize it . A key is required to perturb or initialize the algorithm in a keyed checksum . Just make your device a child of an IOAudioDevice , initialize it and set up your audio data engine : now it 's only a matter of properly reporting its activity to the Audio HAL .