glwe ops

poulpy-hal/src/api/module.rs

@@ -8,3 +8,9 @@ pub trait ModuleNew<B: Backend> {
 pub trait ModuleN {
     fn n(&self) -> usize;
 }
+
+pub trait ModuleLogN where Self: ModuleN{
+    fn log_n(&self) -> usize{
+        (u64::BITS - (self.n() as u64-1).leading_zeros()) as usize
+    }
+}

poulpy-hal/src/layouts/module.rs

@@ -2,7 +2,7 @@ use std::{fmt::Display, marker::PhantomData, ptr::NonNull};
 
 use rand_distr::num_traits::Zero;
 
-use crate::{GALOISGENERATOR, api::ModuleN};
+use crate::{api::{ModuleLogN, ModuleN}, GALOISGENERATOR};
 
 #[allow(clippy::missing_safety_doc)]
 pub trait Backend: Sized {
@@ -86,6 +86,8 @@ where
     }
 }
 
+impl<BE: Backend> ModuleLogN for Module<BE> where Self: ModuleN{}
+
 impl<BE: Backend> CyclotomicOrder for Module<BE> where Self: ModuleN {}
 
 pub trait GaloisElement