private SrpConstants(string hexN, string decG)
{
N = new BigInteger(hexN, 16);
Nb = N.ToByteArrayUnsigned();
g = new BigInteger(decG, 10);
gb = g.ToByteArrayUnsigned();
kb = ComputeHash(Nb, gb);
k = new BigInteger(1, kb);
kb2 = Xor(ComputeHash(Nb), ComputeHash(gb));
}