C++ (Cpp) PRNG::SetSeed Examples

Example #1

File: MAC_Check.cpp Project: lance6716/SPDZ-2

void MAC_Check<T>::Check(const Player& P)
{
  if (WaitingForCheck() == 0)
    return;

  //cerr << "In MAC Check : " << popen_cnt << endl;
  octet seed[SEED_SIZE];
  this->timers[SEED].start();
  Create_Random_Seed(seed,P,SEED_SIZE);
  this->timers[SEED].stop();
  PRNG G;
  G.SetSeed(seed);

  Share<T>  sj;
  T a,gami,h,temp;
  a.assign_zero();
  gami.assign_zero();
  vector<T> tau(P.num_players());
  for (int i=0; i<popen_cnt; i++)
    { h.almost_randomize(G);
      temp.mul(h,vals[i]);
      a.add(a,temp);
      
      temp.mul(h,macs[i]);
      gami.add(gami,temp);
    }
  vals.erase(vals.begin(), vals.begin() + popen_cnt);
  macs.erase(macs.begin(), macs.begin() + popen_cnt);
  temp.mul(this->alphai,a);
  tau[P.my_num()].sub(gami,temp);

  //cerr << "\tCommit and Open" << endl;
  this->timers[COMMIT].start();
  Commit_And_Open(tau,P);
  this->timers[COMMIT].stop();

  //cerr << "\tFinal Check" << endl;

  T t;
  t.assign_zero();
  for (int i=0; i<P.num_players(); i++)
    { t.add(t,tau[i]); }
  if (!t.is_zero()) { throw mac_fail(); }

  popen_cnt=0;
}