/// <summary>
/// Creates a round 2 (zero-knowledge proof) DTO to send to the partner participant.
/// </summary>
/// <exception cref="InvalidOperationException">
/// Prior round (1) has not been completed yet, or method may have been called more than once.
/// </exception>
public ECJpakeRound2 CreateRound2ToSend()
{
if (ProtocolState >= State.Round2Created)
{
throw new InvalidOperationException("Round 2 payload already created.");
}
if (ProtocolState < State.Round1Validated)
{
throw new InvalidOperationException("Round 1 payload must be validated prior to creating Round 2 payload.");
}
var s1 = new BigInteger(_passwordBytes);
ECPoint GA = _gx1.Add(_gx3).Add(_gx4);
BigInteger x2s1 = _x2.Multiply(s1).Mod(_domain.N);
ECPoint A = BasePointMultiplier.Multiply(GA, x2s1);
ECPoint X2sV;
BigInteger X2sR;
CreateZeroKnowledgeProof(GA, x2s1, A, ParticipantId, out X2sV, out X2sR);
var dto = new ECJpakeRound2 {
ParticipantId = ParticipantId,
A = A.GetEncoded(),
X2sV = X2sV.GetEncoded(),
X2sR = X2sR.ToByteArray()
};
ProtocolState = State.Round2Created;
return(dto);
}
/// <inheritdoc />
public override int GetHashCode()
{
unchecked {
int hashCode = ParticipantId.GetHashCode();
hashCode = (hashCode * 397) ^ A.GetHashCode();
hashCode = (hashCode * 397) ^ X2sV.GetHashCode();
hashCode = (hashCode * 397) ^ X2sR.GetHashCode();
return(hashCode);
}
}
/// <inheritdoc />
public bool Equals(ECJpakeRound2 other)
{
if (ReferenceEquals(null, other))
{
return(false);
}
if (ReferenceEquals(this, other))
{
return(true);
}
return(String.Equals(ParticipantId, other.ParticipantId, StringComparison.Ordinal) &&
A.SequenceEqualShortCircuiting(other.A) && X2sV.SequenceEqualShortCircuiting(other.X2sV) &&
X2sR.SequenceEqualShortCircuiting(other.X2sR));
}
