private static byte[] CalculateS(byte[] r, byte[] k, byte[] s)
{
uint[] t = new uint[ScalarUints * 2]; DecodeScalar(r, 0, t);
uint[] u = new uint[ScalarUints]; DecodeScalar(k, 0, u);
uint[] v = new uint[ScalarUints]; DecodeScalar(s, 0, v);
Nat.MulAddTo(14, u, v, t);
byte[] result = new byte[ScalarBytes * 2];
for (int i = 0; i < t.Length; ++i)
{
Encode32(t[i], result, i * 4);
}
return(ReduceScalar(result));
}
