get CW$n, CW%args
Gets $n random bytes and returns them as a string.
This method may produce fatal errors if the source was unable to provide enough
read CW$buf, CW$n, [ CW$off ]
This method is cannibalized from IO::Scalar. It provides an IO::Handle
Note that subclasses override this to operate on a real handle directly if
On supporting sources this method will add @stuff, whatever it may be, to
the random seed.
Some sources may not support this, so be careful.