  Quantum gravity is effective in domains where both quantum effects and
gravity are essential, such as in the vicinity of space-time singularities.
This paper will investigate the quantization of a black-hole gravity,
particularly the region surrounding the singularity at the origin of the
coordinate system. Describing the system with a Hamiltonian formalism, we apply
the covariant integral quantization method to find the Wheeler-DeWitt equation
of the model. We find that the quantized system has a discrete energy spectrum
in the region inside the event horizon. Through the Kantowski-Sachs metric, it
is possible to correlate the entropic time, which gives the dynamics for this
model, to the cosmic time in a non-trivial way. Different configurations for
the phase space of a Schwarzschild black hole are obtained in a semi-classical
analysis. For lower-energy states, the quantum corrections result in
singularity removal and wormhole formation.
