Method eval

BMR/Register.cpp:221–296

}

void Register::eval(const Register& left, const Register& right, GarbledGate& gate,
        party_id_t my_id, char* prf_output, int w_o, int w_l, int w_r)
{
    (void)w_o;
    (void)w_l;
    (void)w_r;
    size_t n_parties = CommonParty::singleton->get_n_parties();
    int sig_l = left.get_external();
    int sig_r = right.get_external();
    int entry = 2 * sig_l + sig_r;

#ifdef DEBUG_MASK
    cout << "input signals: " << sig_l << " " << sig_r << endl;
#endif

#ifdef DEBUG
    gate.print();
    cout << "picking " << entry << endl;
#endif

    garbled_entry = gate[entry];
    int ext_l = entry%2 ? 1 : 0 ;
    int ext_r = entry<2 ? 0 : 1 ;

#ifdef DEBUG
    printf("left input");
    phex(gate.input(ext_l, 1), 16);
    printf("right input");
    phex(gate.input(ext_r, 1), 16);
    unsigned g = gate.id;
#endif

    Key k;
    for(party_id_t i=1; i<=n_parties; i++) {
#ifdef DEBUG
                                std::cout << "using key: " << left.external_key(i) << endl;
#endif
        PRF_chunk(left.external_key(i), gate.input(ext_l, 1), prf_output, PAD_TO_8(n_parties));
        for(party_id_t j=1; j<=n_parties; j++) {
            k = *(Key*)(prf_output+16*(j-1));
#ifdef DEBUG
                        printf("Fk^%d_{%u,%d}(%d,%u,%d) = ",i, w_l, sig_l,ext_l,g,j);
                        std::cout << k << std::endl;
#endif
            garbled_entry[j-1] -= k;
        }

#ifdef DEBUG
                                    std::cout << "using key: " << right.external_key(i) << endl;
#endif
        PRF_chunk(right.external_key(i), gate.input(ext_r, 1) , prf_output, PAD_TO_8(n_parties));
        for(party_id_t j=1; j<=n_parties; j++) {
            k = *(Key*)(prf_output+16*(j-1));
#ifdef DEBUG
            printf("Fk^%d_{%u,%d}(%d,%u,%d) = ",i, w_r, sig_r,ext_r,g,j);
                        std::cout << k << std::endl;
#endif
            garbled_entry[j-1] -= k;