def reencrypt(kfrag: KFrag,
capsule: Capsule,
provide_proof: bool = True,
metadata: Optional[bytes] = None) -> CapsuleFrag:
if not capsule.verify():
raise Capsule.NotValid
if not kfrag.verify_for_capsule(capsule):
raise KFrag.NotValid
rk = kfrag._bn_key
e1 = rk * capsule._point_e
v1 = rk * capsule._point_v
cfrag = CapsuleFrag(point_e1=e1,
point_v1=v1,
kfrag_id=kfrag._id,
point_noninteractive=kfrag._point_noninteractive,
point_xcoord=kfrag._point_xcoord)
if provide_proof:
prove_cfrag_correctness(cfrag, kfrag, capsule, metadata)
return cfrag
def reencrypt(kfrag: KFrag,
capsule: Capsule,
provide_proof: bool = True,
metadata: Optional[bytes] = None) -> CapsuleFrag:
if not isinstance(capsule, Capsule) or not capsule.verify():
raise Capsule.NotValid
elif not isinstance(kfrag, KFrag) or not kfrag.verify_for_capsule(capsule):
raise KFrag.NotValid
rk = kfrag._bn_key
e1 = rk * capsule._point_e # type: Any
v1 = rk * capsule._point_v # type: Any
cfrag = CapsuleFrag(point_e1=e1,
point_v1=v1,
kfrag_id=kfrag.id,
point_precursor=kfrag._point_precursor)
if provide_proof:
prove_cfrag_correctness(cfrag, kfrag, capsule, metadata)
return cfrag