private static void RunSecureComputationParty(int localPartyId, BitArray localInput)
{
using (IMultiPartyNetworkSession session = CreateLocalSession(localPartyId, StartPort, NumberOfParties))
{
using (CryptoContext cryptoContext = CryptoContext.CreateDefault())
{
IObliviousTransfer obliviousTransfer = new NaorPinkasObliviousTransfer(
SecurityParameters.CreateDefault768Bit(),
cryptoContext
);
IMultiplicativeSharing multiplicativeSharing = new ObliviousTransferMultiplicativeSharing(
obliviousTransfer,
cryptoContext
);
GMWSecureComputation computation = new GMWSecureComputation(session, multiplicativeSharing, cryptoContext);
Stopwatch stopwatch = Stopwatch.StartNew();
SetIntersectionSecureProgram secureProgram = new SetIntersectionSecureProgram(NumberOfParties, NumberOfElements);
object[] outputPrimitives = secureProgram.EvaluateAsync(computation, new[] { localInput }).Result;
BitArray intersection = (BitArray)outputPrimitives[0];
BigInteger count = (BigInteger)outputPrimitives[1];
stopwatch.Stop();
Console.WriteLine();
Console.WriteLine("Completed protocol as {0} in {1} ms.", session.LocalParty.Name, stopwatch.ElapsedMilliseconds);
Console.WriteLine(" Local input: {0}", localInput.ToBinaryString());
Console.WriteLine(" Computed intersection: {0}", intersection.ToBinaryString());
Console.WriteLine(" Computed number of matches: {0}", count);
}
}
}
private static async Task RunSecureComputationPartyAsync(int localPartyId, BitArray localInput)
{
Console.WriteLine($"Starting party {localPartyId}...");
using IMultiPartyNetworkSession session = await TcpMultiPartyNetworkSession.EstablishLoopbackAsync(
new Party (localPartyId),
StartPort,
NumberOfParties
);
using CryptoContext cryptoContext = CryptoContext.CreateDefault();
IObliviousTransfer obliviousTransfer = new NaorPinkasObliviousTransfer(
SecurityParameters.CreateDefault768Bit(),
cryptoContext
);
IMultiplicativeSharing multiplicativeSharing = new ObliviousTransferMultiplicativeSharing(
obliviousTransfer,
cryptoContext
);
SecretSharingSecureComputation computation = new SecretSharingSecureComputation(
session,
multiplicativeSharing,
cryptoContext
);
Stopwatch stopwatch = Stopwatch.StartNew();
SetIntersectionSecureProgram secureProgram = new SetIntersectionSecureProgram(NumberOfParties, NumberOfElements);
object[] outputPrimitives = await secureProgram.EvaluateAsync(computation, new object[] { localInput });
BitArray intersection = (BitArray)outputPrimitives[0];
BigInteger count = (BigInteger)outputPrimitives[1];
stopwatch.Stop();
Console.WriteLine();
Console.WriteLine($"Completed protocol as {session.LocalParty.Name} in {stopwatch.ElapsedMilliseconds} ms.");
Console.WriteLine($" Local input: {localInput.ToBinaryString()}");
Console.WriteLine($" Computed intersection: {intersection.ToBinaryString()}");
Console.WriteLine($" Computed number of matches: {count}");
Console.WriteLine();
Console.WriteLine("Press any key to exit.");
Console.ReadKey(true);
}