No, actually, in this case it's an exception in law. The authorities come from a crown prerogative and they are codified in the Canadian passport order. It's important to mention that there are sections in the Canadian passport order that say that these ministers may exercise crown prerogative. Therefore, the codification is in the order but it does not constitute the whole of the prerogative. The prerogative exists independently.
On May 26th, 2015. See this statement in context.