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);
}
