OBSOLETE. Catalysis of the reaction: ATP + 1D-myo-inositol hexakisphosphate = ADP + 1-diphospho-1D-myo-inositol (2,3,4,5,6)pentakisphosphate, and ATP + 1D-myo-inositol hexakisphosphate = ADP + 3-diphospho-1D-myo-inositol (1,2,4,5,6)pentakisphosphate.