Traits reduction, file + structs renaming

poulpy-core/src/keyswitching/lwe.rs

@@ -0,0 +1,122 @@
+use poulpy_hal::{
+    api::ScratchAvailable,
+    layouts::{Backend, DataMut, Module, Scratch, ZnxView, ZnxViewMut, ZnxZero},
+};
+
+use crate::{
+    LWESampleExtract, ScratchTakeCore,
+    keyswitching::GLWEKeyswitch,
+    layouts::{GGLWEInfos, GGLWEPreparedToRef, GLWE, GLWELayout, LWE, LWEInfos, LWEToMut, LWEToRef, Rank, TorusPrecision},
+};
+
+impl LWE<Vec<u8>> {
+    pub fn keyswitch_tmp_bytes<M, R, A, K, BE: Backend>(module: &M, res_infos: &R, a_infos: &A, key_infos: &K) -> usize
+    where
+        R: LWEInfos,
+        A: LWEInfos,
+        K: GGLWEInfos,
+        M: LWEKeySwitch<BE>,
+    {
+        module.lwe_keyswitch_tmp_bytes(res_infos, a_infos, key_infos)
+    }
+}
+
+impl<D: DataMut> LWE<D> {
+    pub fn keyswitch<M, A, K, BE: Backend>(&mut self, module: &M, a: &A, ksk: &K, scratch: &mut Scratch<BE>)
+    where
+        A: LWEToRef,
+        K: GGLWEPreparedToRef<BE> + GGLWEInfos,
+        Scratch<BE>: ScratchTakeCore<BE>,
+        M: LWEKeySwitch<BE>,
+    {
+        module.lwe_keyswitch(self, a, ksk, scratch);
+    }
+}
+
+impl<BE: Backend> LWEKeySwitch<BE> for Module<BE> where Self: GLWEKeyswitch<BE> + LWESampleExtract {}
+
+pub trait LWEKeySwitch<BE: Backend>
+where
+    Self: GLWEKeyswitch<BE> + LWESampleExtract,
+{
+    fn lwe_keyswitch_tmp_bytes<R, A, K>(&self, res_infos: &R, a_infos: &A, key_infos: &K) -> usize
+    where
+        R: LWEInfos,
+        A: LWEInfos,
+        K: GGLWEInfos,
+    {
+        let max_k: TorusPrecision = a_infos.k().max(res_infos.k());
+
+        let glwe_a_infos: GLWELayout = GLWELayout {
+            n: self.n().into(),
+            base2k: a_infos.base2k(),
+            k: max_k,
+            rank: Rank(1),
+        };
+
+        let glwe_res_infos: GLWELayout = GLWELayout {
+            n: self.n().into(),
+            base2k: res_infos.base2k(),
+            k: max_k,
+            rank: Rank(1),
+        };
+
+        let glwe_in: usize = GLWE::bytes_of_from_infos(&glwe_a_infos);
+        let glwe_out: usize = GLWE::bytes_of_from_infos(&glwe_res_infos);
+        let ks: usize = self.glwe_keyswitch_tmp_bytes(&glwe_res_infos, &glwe_a_infos, key_infos);
+
+        glwe_in + glwe_out + ks
+    }
+
+    fn lwe_keyswitch<R, A, K>(&self, res: &mut R, a: &A, ksk: &K, scratch: &mut Scratch<BE>)
+    where
+        R: LWEToMut,
+        A: LWEToRef,
+        K: GGLWEPreparedToRef<BE> + GGLWEInfos,
+        Scratch<BE>: ScratchTakeCore<BE>,
+    {
+        let res: &mut LWE<&mut [u8]> = &mut res.to_mut();
+        let a: &LWE<&[u8]> = &a.to_ref();
+
+        assert!(res.n().as_usize() <= self.n());
+        assert!(a.n().as_usize() <= self.n());
+        assert_eq!(ksk.n(), self.n() as u32);
+        assert!(scratch.available() >= self.lwe_keyswitch_tmp_bytes(res, a, ksk));
+
+        let max_k: TorusPrecision = res.k().max(a.k());
+
+        let a_size: usize = a.k().div_ceil(ksk.base2k()) as usize;
+
+        let (mut glwe_in, scratch_1) = scratch.take_glwe(
+            self,
+            &GLWELayout {
+                n: ksk.n(),
+                base2k: a.base2k(),
+                k: max_k,
+                rank: Rank(1),
+            },
+        );
+        glwe_in.data.zero();
+
+        let (mut glwe_out, scratch_1) = scratch_1.take_glwe(
+            self,
+            &GLWELayout {
+                n: ksk.n(),
+                base2k: res.base2k(),
+                k: max_k,
+                rank: Rank(1),
+            },
+        );
+
+        let n_lwe: usize = a.n().into();
+
+        for i in 0..a_size {
+            let data_lwe: &[i64] = a.data.at(0, i);
+            glwe_in.data.at_mut(0, i)[0] = data_lwe[0];
+            glwe_in.data.at_mut(1, i)[..n_lwe].copy_from_slice(&data_lwe[1..]);
+        }
+
+        self.glwe_keyswitch(&mut glwe_out, &glwe_in, ksk, scratch_1);
+        self.lwe_sample_extract(res, &glwe_out);
+    }
+}