CRIMES ACT 1914 SECT 18

(1)

Where imprisonment is imposed in respect of any offence against any law of the Commonwealth it may (unless the contrary intention appears in the law) be imposed either with or without hard labour.

(2)

Where under the law of a State or Territory a convicted person may in particular cases be imprisoned in a particular kind or class of prison, a person convicted of an offence against the law of the Commonwealth may, in corresponding cases, be imprisoned in the kind or class of prison appropriate to the circumstances.