public static void scalarmult(
byte[] q, int qoffset,
byte[] n, int noffset,
byte[] p, int poffset)
{
FieldElement p0, q0;
FieldOperations.fe_frombytes2(out p0, p, poffset);
scalarmult(out q0, n, noffset, ref p0);
FieldOperations.fe_tobytes(q, qoffset, ref q0);
}