Called by the (Entropy)[trait.Entropy32.html] when there is entropy available.
entropy in an
Iterator of available entropy. The amount of
entropy available may increase if
entropy is not consumed
quickly so clients should not rely on iterator termination to
finish consuming entropy.
The client returns either
Continue::More if the iterator did
not have enough entropy (indicating another
entropy_available callback is requested) and the client
would like to be called again when more is available, or
Continue::Done, which indicates
not be called again until
get() is called.
entropy_available is triggered after a call to
then error MUST be CANCEL and
entropy MAY contain bits of