Method fake_keys

FHEOffline/SimpleMachine.cpp:230–267

template <class FD>
void MultiplicativeMachine::fake_keys(int slack)
{
    PlainPlayer P(N, "fake");
    octetStream os;
    PartSetup<FD>& part_setup = setup.part<FD>();
    if (P.my_num() == 0)
    {
        part_setup.generate_setup(N.num_players(), field_size, sec, slack, true);
        vector<PartSetup<FD> > setups;
        part_setup.fake(setups, P.num_players(), false);
        for (int i = 1; i < P.num_players(); i++)
        {
            setups[i].pack(os);
            P.send_to(i, os);
            os.reset_write_head();
        }
        // same transmission for all players, less problem
        setups[0].pack(os);
    }
    else
    {
        P.receive_player(0, os);
    }
    part_setup.unpack(os);
    part_setup.check();

    SeededPRNG G;
    part_setup.alphai.randomize(G);
    Share<typename FD::T>::set_mac_key(part_setup.alphai);
    Plaintext_<FD> m(part_setup.FieldD);
    m.assign_constant(part_setup.alphai);
    vector<Ciphertext> C({part_setup.pk.encrypt(m)});
    TreeSum<Ciphertext>().run(C, P);
    part_setup.calpha = C[0];

    if (output)
        part_setup.output(N);
}

void MachineBase::run()
{