in src/hashwires.rs [426:433]
fn pick_mdp_index(proving_value: &BigUint, mdp: &[BigUint]) -> Result<usize, HwError> {
for i in (0..mdp.len()).rev() {
if proving_value <= &mdp[i] {
return Ok(i);
}
}
Err(HwError::MdpError)
}