//public override byte[] writeToByteArray()
//{
// var bs = new BitStream();
// bs.writeMessageType(MessageType.MULT_STEP_BCASE);
// writeToBitStreamNoHeader(bs);
// bs.close();
// return bs.ByteArray;
//}
//public override void writeToBitStreamNoHeader(BitStream bs)
//{
// writeSecret(bs, aShare);
// writeSecret(bs, bShare);
// writeSecret(bs, abShare);
// writeSecret(bs, rShare);
//}
//public static MultStepBCaseShare readFromBitStreamNoHeader(BitStream bs, int prime)
//{
// var multStepBCaseShare = new MultStepBCaseShare();
// multStepBCaseShare.loadFromByteArrayNoHeader(bs, prime);
// return multStepBCaseShare;
//}
//public override void loadFromByteArrayNoHeader(BitStream bs, int prime)
//{
// aShare = readSecret(bs, prime);
// bShare = readSecret(bs, prime);
// abShare = readSecret(bs, prime);
// rShare = readSecret(bs, prime);
//}
//private void writeSecret(BitStream bs, Zp secret)
//{
// bs.writeBoolean(secret != null);
// if (secret != null)
// bs.writeInt(secret.Value, BitStream.LENGTH_OF_SECRET);
//}
//private Zp readSecret(BitStream bs, int prime)
//{
// if (bs.readBoolean())
// return new Zp(prime, bs.readInt(BitStream.LENGTH_OF_SECRET));
// else
// return null;
//}
//public override bool Equals(object obj)
//{
// if (!(obj is MultStepBCaseShare))
// return false;
// MultStepBCaseShare second = (MultStepBCaseShare)obj;
// return compareSecrets(aShare, second.aShare) && compareSecrets(bShare, second.bShare) && compareSecrets(abShare, second.abShare) && compareSecrets(rShare, second.rShare);
//}
public static MultStepBCaseShare createRandom(int prime) //for testing
{
double d = (new Random(1)).NextDouble();
if (d < 0.25)
{
return(null);
}
var multStepBCaseShare = new MultStepBCaseShare();
multStepBCaseShare.AShare = new Zp(prime, (int)Math.Floor(d * 20));
multStepBCaseShare.BShare = new Zp(prime, (int)Math.Floor(d * 40));
multStepBCaseShare.AbShare = new Zp(prime, (int)Math.Floor(d * 60));
multStepBCaseShare.RShare = new Zp(prime, (int)Math.Floor(d * 80));
return(multStepBCaseShare);
}
//for testing
//public override byte[] writeToByteArray()
//{
// var bs = new BitStream();
// bs.writeMessageType(MessageType.MULT_STEP_BCASE);
// writeToBitStreamNoHeader(bs);
// bs.close();
// return bs.ByteArray;
//}
//public override void writeToBitStreamNoHeader(BitStream bs)
//{
// writeSecret(bs, aShare);
// writeSecret(bs, bShare);
// writeSecret(bs, abShare);
// writeSecret(bs, rShare);
//}
//public static MultStepBCaseShare readFromBitStreamNoHeader(BitStream bs, int prime)
//{
// var multStepBCaseShare = new MultStepBCaseShare();
// multStepBCaseShare.loadFromByteArrayNoHeader(bs, prime);
// return multStepBCaseShare;
//}
//public override void loadFromByteArrayNoHeader(BitStream bs, int prime)
//{
// aShare = readSecret(bs, prime);
// bShare = readSecret(bs, prime);
// abShare = readSecret(bs, prime);
// rShare = readSecret(bs, prime);
//}
//private void writeSecret(BitStream bs, Zp secret)
//{
// bs.writeBoolean(secret != null);
// if (secret != null)
// bs.writeInt(secret.Value, BitStream.LENGTH_OF_SECRET);
//}
//private Zp readSecret(BitStream bs, int prime)
//{
// if (bs.readBoolean())
// return new Zp(prime, bs.readInt(BitStream.LENGTH_OF_SECRET));
// else
// return null;
//}
//public override bool Equals(object obj)
//{
// if (!(obj is MultStepBCaseShare))
// return false;
// MultStepBCaseShare second = (MultStepBCaseShare)obj;
// return compareSecrets(aShare, second.aShare) && compareSecrets(bShare, second.bShare) && compareSecrets(abShare, second.abShare) && compareSecrets(rShare, second.rShare);
//}
public static MultStepBCaseShare createRandom(int prime)
{
double d = (new Random(1)).NextDouble();
if (d < 0.25)
return null;
var multStepBCaseShare = new MultStepBCaseShare();
multStepBCaseShare.AShare = new Zp(prime, (int)Math.Floor(d * 20));
multStepBCaseShare.BShare = new Zp(prime, (int)Math.Floor(d * 40));
multStepBCaseShare.AbShare = new Zp(prime, (int)Math.Floor(d * 60));
multStepBCaseShare.RShare = new Zp(prime, (int)Math.Floor(d * 80));
return multStepBCaseShare;
}
private bool IsRecvShareLegal(MultStepBCaseShare recvShareFromPlayer)
{
if ((recvShareFromPlayer == null) ||
(recvShareFromPlayer.AShare == null) ||
(recvShareFromPlayer.BShare == null) ||
(recvShareFromPlayer.AbShare == null) ||
(recvShareFromPlayer.RShare == null))
return false;
return true;
}
private bool IsMultStepShareLegal(MultStepBCaseShare recvShareFromPlayer_i, MultStepVerificationPoly recvVerifcationPolynomial)
{
if (!IsRecvShareLegal(recvShareFromPlayer_i))
return false;
var RxPolynomial = recvVerifcationPolynomial.RxPolynomial;
Zp Ratpoint0 = Zp.EvalutePolynomialAtPoint(RxPolynomial, new Zp(Prime, 0));
if (!Ratpoint0.Equals(new Zp(Prime, 0)))
{
return false;
}
int w = NumTheoryUtils.GetFieldMinimumPrimitive(Prime);
var w_InMyIndex = new Zp(Prime, NumTheoryUtils.ModPow(w, Party.Id, Prime));
Zp RjFromPublicPolynomial = Zp.EvalutePolynomialAtPoint(RxPolynomial, w_InMyIndex);
Zp temp = recvShareFromPlayer_i.AShare.ConstMul(recvShareFromPlayer_i.BShare).ConstSub(recvShareFromPlayer_i.AbShare);
Zp RjFromRecvPrivateInfo = w_InMyIndex.ConstMul(recvShareFromPlayer_i.RShare).ConstAdd(temp);
if (!RjFromPublicPolynomial.Equals(RjFromRecvPrivateInfo))
return false;
return true;
}
