virtual QPair<QByteArray, bool> GetBulkData(int) { QByteArray data(1024, 0); CreateDescriptor(data); SetTriggered(); int my_idx = GetGroup().GetIndex(GetLocalId()); int bad = Random::GetInstance().GetInt(0, GetGroup().Count()); while(bad == my_idx) { bad = Random::GetInstance().GetInt(0, GetGroup().Count()); } qDebug() << my_idx << "setting bad hash at" << bad; const Descriptor &cdes = GetMyDescriptor(); QVector<QByteArray> hashes = cdes.XorMessageHashes(); hashes[bad] = Hash().ComputeHash(data); Descriptor descriptor(cdes.Length(), cdes.PublicDh(), hashes, cdes.CleartextHash()); SetMyDescriptor(descriptor); QByteArray my_desc; QDataStream desstream(&my_desc, QIODevice::WriteOnly); desstream << GetMyDescriptor(); return QPair<QByteArray, bool>(my_desc, false); }
void BulkRound::CreateDescriptor(const QByteArray &data) { int length = data.size(); Hash hashalgo; QByteArray xor_message(length, 0); QVector<QByteArray> hashes; int my_idx = GetGroup().GetIndex(GetLocalId()); foreach(const PublicIdentity &gc, GetGroup().GetRoster()) { QByteArray seed = _anon_dh.GetSharedSecret(gc.GetDhKey()); if(hashes.size() == my_idx) { hashes.append(QByteArray()); continue; } QByteArray msg(length, 0); CryptoRandom(seed).GenerateBlock(msg); hashes.append(hashalgo.ComputeHash(msg)); Xor(xor_message, xor_message, msg); } QByteArray my_xor_message = QByteArray(length, 0); Xor(my_xor_message, xor_message, data); SetMyXorMessage(my_xor_message); hashes[my_idx] = hashalgo.ComputeHash(my_xor_message); QByteArray hash = hashalgo.ComputeHash(data); Descriptor descriptor(length, _anon_dh.GetPublicComponent(), hashes, hash); SetMyDescriptor(descriptor); }