Could white holes undergo reverse hawking radiation? This is because of quantum mechanical uncertainty. So for example a pair of particles one a positive and one a negative energy particle. The negative energy escapes the white hole. So could white holes also reverse hawking radiate and get mass through this process. Am I right or is there some unknown physics that would prohibit it?
The answer depends on what you mean by "radiation." A white hole is the time-reverse of a black hole. If you take Hawking's original calculation and time-reverse the whole thing, you get a white hole that absorbs radiation from the vacuum. That's just as interesting as a black hole emitting radiation, because a white hole isn't supposed to be able to absorb anything in classical general relativity, just like a black hole isn't supposed to be able to emit anything.
If you were asking whether a white hole would emit Hawking radiation, then the answer would be less interesting: even in classical general relativity, white holes emit everything. It's the time-reverse of a black hole: you can't escape from a black hole (classically), and you can't stay inside a white hole (classically).
could white holes also reverse hawking radiate and get mass through this process?
The answer is presumably yes, but there's a catch. Hawking's calculation considers quantum fields in a background spacetime, which means the spacetime doesn't react to the quantum fields. That's just an approximation, of course, and in reality we expect that the spacetime will react, resulting in the loss of mass from a black hole. To implement that in a self-consistent theory requires some kind of quantum gravity theory, and I expect that the existence of white holes in quantum gravity would be exceedingly unlikely, for statistical reasons.