def unmask(self: mask, argument: data) -> data:
"""
Unmask a data object that has previously been masked with this mask.
>>> d = data.hash('abc')
>>> m = mask.hash('abc')
>>> m.unmask(m(d)) == d
True
"""
return data(oblivious.mul(oblivious.inv(self), argument))
def __mul__(self: mask, argument: data) -> data:
"""
Mask a data object with this mask and return the masked data object.
>>> d = data.hash('abc')
>>> m = mask.hash('abc')
>>> (m * d).hex()
'f47c8267b28ac5100e0e97b36190e16d4533b367262557a5aa7d97b811344d15'
"""
return data(oblivious.mul(self, argument))
def __truediv__(self: data, argument: mask) -> data:
"""
Unmask this data object (assuming it has previously been masked with the
supplied mask).
>>> d = data.hash('abc')
>>> m = mask.hash('abc')
>>> ((m(d)) / m) == d
True
"""
return data(oblivious.mul(oblivious.inv(argument), self))