/// <summary>
/// M is client's proof of K.
/// </summary>
/// <returns></returns>
public static Byte[] CalcM(NetBigInteger N, NetBigInteger g, String userName, Byte[] salt, NetBigInteger A, NetBigInteger B, Byte[] K)
{
// User -> Host: M = H(H(N) xor H(g), H(I), s, A, B, K)
Byte[] gBytes = g.ToByteArray();
Byte[] NBytes = N.ToByteArray();
Byte[] hg = hashAlgo.ComputeHash(gBytes);
Byte[] hN = hashAlgo.ComputeHash(NBytes);
Byte[] gNXorBytes = XorArrays(hN, hg);
Byte[] userNameBytes = Encoding.UTF8.GetBytes(userName);
Byte[] hUserNameBytes = hashAlgo.ComputeHash(userNameBytes);
Byte[] ABytes = A.ToByteArray();
Byte[] BBytes = B.ToByteArray();
ArrayList al = new ArrayList();
al.Add(gNXorBytes);
al.Add(hUserNameBytes);
al.Add(salt);
al.Add(ABytes);
al.Add(BBytes);
al.Add(K);
Byte[] all = NetUtility.JoinArrays(al);
return(hashAlgo.ComputeHash(all));
}