  We prove that quantum-hard one-way functions imply simulation-secure quantum
oblivious transfer (QOT), which is known to suffice for secure computation of
arbitrary quantum functionalities. Furthermore, our construction only makes
black-box use of the quantum-hard one-way function.
  Our primary technical contribution is a construction of extractable and
equivocal quantum bit commitments based on the black-box use of quantum-hard
one-way functions in the standard model. Instantiating the Cr\'epeau-Kilian
(FOCS 1988) framework with these commitments yields simulation-secure QOT.
