public override void HandleMessage(int fromId, Msg msg)
{
switch (msg.Type)
{
case MsgType.Commit:
// collect commitments from parties
Commitment = ((CommitMsg)msg).Commitment;
break;
case MsgType.Share:
// collect shares from parties
var swMsg = msg as ShareWitnessMsg <BigZp>;
if (PolyCommit != null && Commitment != null &&
!PolyCommit.VerifyEval(Commitment, new BigZp(Prime, DstQuorum.GetPositionOf(Me.Id) + 1), swMsg.Share, swMsg.Witness))
{
// broadcast an accusation against the i-th party.
throw new NotImplementedException();
}
else if (PolyCommit != null && Commitment == null)
{
Console.Write("No commitment received from" + fromId);
}
IsCompleted = true;
Result = new Share <BigZp>(swMsg.Share, false);
break;
}
}
public override void HandleMessage(int fromId, Msg msg)
{
switch (msg.Type)
{
case MsgType.Commit:
// collect commitments from parties
commitsRecv[fromId] = msg as CommitMsg;
break;
case MsgType.Share:
// collect shares from parties
sharesRecv[fromId] = msg as ShareWitnessMsg <BigZp>;
if (commitsRecv.ContainsKey(fromId))
{
// verify the share
if (PolyCommit != null && !PolyCommit.VerifyEval(commitsRecv[fromId].Commitment, new BigZp(Prime, Quorum.GetPositionOf(Me.Id) + 1),
sharesRecv[fromId].Share, sharesRecv[fromId].Witness))
{
// broadcast an accusation against the i-th party.
throw new NotImplementedException();
}
// add the share to the shares received from all parties
CombinedShare += sharesRecv[fromId].Share;
if (++numSharesRecv >= Math.Ceiling(2.0 * Quorum.Size / 3.0) && !scheduledReconst)
{
// send a loopback message to notify the end of this round. This is done to
// ensure we receive the inputs of "all" honest parties in this round and
// bad parties cannot prevent us from receiving honest input by sending bad inputs sooner.
Send(Me.Id, new Msg(MsgType.NextRound));
scheduledReconst = true;
}
}
else
{
Console.WriteLine("No commitment received for party " + fromId);
}
break;
case MsgType.NextRound:
if (fromId != Me.Id)
{
Console.WriteLine("Invalid next round message received. Party " + fromId + " seems to be cheating!");
}
IsCompleted = true;
Result = new Share <BigZp>(CombinedShare, false);
break;
}
}
public override void HandleMessage(int fromId, Msg msg)
{
switch (msg.Type)
{
case MsgType.Commit:
commitsRecv[fromId] = msg as CommitMsg;
numCommitsRecv[fromId]++;
Debug.Assert(numCommitsRecv[fromId] <= StartSharesPerParty);
break;
case MsgType.Share:
if (commitsRecv.ContainsKey(fromId))
{
int whichOrigShare = numCommitsRecv[fromId] - 1;
int whichFinalFromOrigShare = sharesRecv[fromId][whichOrigShare].Count;
int evalPoint = MyQuorumIndex * FinalSharesPerParty + whichFinalFromOrigShare + 1;
var swMessage = msg as ShareWitnessMsg <BigZp>;
sharesRecv[fromId][numCommitsRecv[fromId] - 1].Add(swMessage);
ReceivedReshareCount++;
if (PolyCommit != null && !PolyCommit.VerifyEval(commitsRecv[fromId].Commitment, new BigZp(Prime, evalPoint), swMessage.Share, swMessage.Witness))
{
throw new NotImplementedException();
}
}
else
{
Console.WriteLine("No commitment from " + fromId);
}
// send the message to start the next round when we have received all of the shares from everybody
if (ReceivedReshareCount == StartShareCount * FinalSharesPerParty)
{
Send(Me.Id, new Msg(MsgType.NextRound));
}
break;
case MsgType.NextRound:
Recombine();
break;
}
}