core refactoring (#69)

core/src/encryption/compressed/ggsw_ct.rs

@@ -0,0 +1,90 @@
+use backend::hal::{
+    api::{ScratchAvailable, TakeVecZnx, TakeVecZnxDft, VecZnxAddScalarInplace, VecZnxNormalizeInplace, ZnxZero},
+    layouts::{Backend, DataMut, DataRef, Module, ScalarZnx, Scratch},
+};
+use sampling::source::Source;
+
+use crate::{
+    TakeGLWEPt,
+    encryption::glwe_encrypt_sk_internal,
+    layouts::{GGSWCiphertext, Infos, compressed::GGSWCiphertextCompressed, prepared::GLWESecretExec},
+};
+
+use crate::trait_families::GGSWEncryptSkFamily;
+
+impl GGSWCiphertextCompressed<Vec<u8>> {
+    pub fn encrypt_sk_scratch_space<B: Backend>(module: &Module<B>, n: usize, basek: usize, k: usize, rank: usize) -> usize
+    where
+        Module<B>: GGSWEncryptSkFamily<B>,
+    {
+        GGSWCiphertext::encrypt_sk_scratch_space(module, n, basek, k, rank)
+    }
+}
+
+impl<DataSelf: DataMut> GGSWCiphertextCompressed<DataSelf> {
+    pub fn encrypt_sk<DataPt: DataRef, DataSk: DataRef, B: Backend>(
+        &mut self,
+        module: &Module<B>,
+        pt: &ScalarZnx<DataPt>,
+        sk: &GLWESecretExec<DataSk, B>,
+        seed_xa: [u8; 32],
+        source_xe: &mut Source,
+        sigma: f64,
+        scratch: &mut Scratch<B>,
+    ) where
+        Module<B>: GGSWEncryptSkFamily<B> + VecZnxAddScalarInplace,
+        Scratch<B>: TakeVecZnxDft<B> + ScratchAvailable + TakeVecZnx,
+    {
+        #[cfg(debug_assertions)]
+        {
+            use backend::hal::api::ZnxInfos;
+
+            assert_eq!(self.rank(), sk.rank());
+            assert_eq!(self.n(), sk.n());
+            assert_eq!(pt.n(), sk.n());
+        }
+
+        let basek: usize = self.basek();
+        let k: usize = self.k();
+        let rank: usize = self.rank();
+        let cols: usize = rank + 1;
+        let digits: usize = self.digits();
+
+        let (mut tmp_pt, scratch_1) = scratch.take_glwe_pt(self.n(), basek, k);
+
+        let mut source = Source::new(seed_xa);
+
+        self.seed = vec![[0u8; 32]; self.rows() * cols];
+
+        (0..self.rows()).for_each(|row_i| {
+            tmp_pt.data.zero();
+
+            // Adds the scalar_znx_pt to the i-th limb of the vec_znx_pt
+            module.vec_znx_add_scalar_inplace(&mut tmp_pt.data, 0, (digits - 1) + row_i * digits, pt, 0);
+            module.vec_znx_normalize_inplace(basek, &mut tmp_pt.data, 0, scratch_1);
+
+            (0..rank + 1).for_each(|col_j| {
+                // rlwe encrypt of vec_znx_pt into vec_znx_ct
+
+                let (seed, mut source_xa_tmp) = source.branch();
+
+                self.seed[row_i * cols + col_j] = seed;
+
+                glwe_encrypt_sk_internal(
+                    module,
+                    self.basek(),
+                    self.k(),
+                    &mut self.at_mut(row_i, col_j).data,
+                    cols,
+                    true,
+                    Some((&tmp_pt, col_j)),
+                    sk,
+                    &mut source_xa_tmp,
+                    source_xe,
+                    sigma,
+                    scratch_1,
+                );
+            });
+        });
+    }
+}