Hawking Radiation does not exist. Two reasons. 1. Matter inside the event horizon is not physically a part of the singularity that is causing said event horizon. 2. Once a any particle enters a singularity, it goes not come out until released by a certain type of event.
The process Hawking described can take place with particles inside the event horizon but not the singularity itself, this means that the area between the event horizon boundary an the singularity itself can have matter extracted using the Hawking principle, but only if matter is present in that area.