wip on BR + added enc/dec for LWE

core/src/lwe/encryption.rs

@@ -0,0 +1,35 @@
+use backend::{alloc_aligned, AddNormal, FillUniform, VecZnx, ZnxView, ZnxViewMut};
+use sampling::source::Source;
+
+use crate::{lwe::LWEPlaintext, Infos, LWECiphertext, LWESecret, SIX_SIGMA};
+
+
+
+impl<DataSelf> LWECiphertext<DataSelf> where DataSelf: AsMut<[u8]> + AsRef<[u8]>{
+    pub fn encrypt_sk<DataPt, DataSk>(&mut self, pt: &LWEPlaintext<DataPt>, sk: &LWESecret<DataSk>, source_xa: &mut Source, source_xe: &mut Source, sigma: f64) where DataPt: AsRef<[u8]>, DataSk: AsRef<[u8]>{
+
+        #[cfg(debug_assertions)]{
+            assert_eq!(self.n(), sk.n())
+        }
+
+        let basek: usize = self.basek();
+
+        self.data.fill_uniform(basek, 0, self.size(), source_xa);
+        let mut tmp_znx: VecZnx<Vec<u8>> = VecZnx::<Vec<u8>>::new::<i64>(1, 1, self.size());
+
+        (0..self.size()).for_each(|i|{
+            tmp_znx.at_mut(0, i)[0] = pt.data.at(0, i)[0] - self.data.at(0, i)[1..].iter().zip(sk.data.at(0, 0)).map(|(x, y)| x * y).sum::<i64>();
+        });
+
+        tmp_znx.add_normal(basek, 0, self.k(), source_xe, sigma, sigma*SIX_SIGMA);
+
+        let mut tmp_bytes: Vec<u8> = alloc_aligned(size_of::<i64>());
+
+        tmp_znx.normalize(basek, 0, &mut tmp_bytes);
+
+        (0..self.size()).for_each(|i|{
+            self.data.at_mut(0, i)[0] = tmp_znx.at(0, i)[0];
+        });
+
+    }
+}