// Private helper function
private static byte[] ComputeChallenge(IssuerParameters ip, GroupElement h0, GroupElement CGamma,
GroupElement Ch0, GroupElement[] C, GroupElement tildeD, GroupElement tildeCgamma, GroupElement tildeT,
GroupElement[] tildeC, byte[] message)
{
HashFunction H = ip.HashFunction;
H.Hash(ip.Digest(false));
H.Hash(h0);
H.Hash(CGamma);
H.Hash(Ch0);
H.Hash(C);
H.Hash(tildeD);
H.Hash(tildeCgamma);
H.Hash(tildeT);
H.Hash(tildeC);
H.Hash(message);
byte[] digest = H.Digest;
#if DEBUG
Debug.WriteLine("h0 = " + BitConverter.ToString(h0.GetEncoded()));
Debug.WriteLine("CGamma = " + BitConverter.ToString(CGamma.GetEncoded()));
Debug.WriteLine("Ch0 = " + BitConverter.ToString(Ch0.GetEncoded()));
if (tildeC != null)
{
Debug.WriteLine("tildeC[0] = " + BitConverter.ToString(tildeC[0].GetEncoded()));
}
Debug.WriteLine("tildeD = " + BitConverter.ToString(tildeD.GetEncoded()));
Debug.WriteLine("tildeT = " + BitConverter.ToString(tildeT.GetEncoded()));
Debug.WriteLine("tildeCgamma = " + BitConverter.ToString(tildeCgamma.GetEncoded()));
Debug.WriteLine("digest = " + BitConverter.ToString(digest));
#endif
return(digest);
}
internal static FieldZqElement ComputeXt(IssuerParameters ip, byte[] TI, bool supportDevice)
{
HashFunction hash = ip.HashFunction;
hash.Hash((byte)1);
hash.Hash(ip.Digest(supportDevice));
hash.Hash(TI);
return(ip.Zq.GetElementFromDigest(hash.Digest));
}
