core refactoring (#69)

core/src/layouts/prepared/ggsw_ct.rs

@@ -0,0 +1,129 @@
+use backend::hal::{
+    api::{VmpPMatAlloc, VmpPMatAllocBytes, VmpPMatPrepare},
+    layouts::{Backend, Data, DataMut, DataRef, Module, Scratch, VmpPMat},
+};
+
+use crate::layouts::{GGSWCiphertext, Infos};
+
+#[derive(PartialEq, Eq)]
+pub struct GGSWCiphertextExec<D: Data, B: Backend> {
+    pub(crate) data: VmpPMat<D, B>,
+    pub(crate) basek: usize,
+    pub(crate) k: usize,
+    pub(crate) digits: usize,
+}
+
+impl<B: Backend> GGSWCiphertextExec<Vec<u8>, B> {
+    pub fn alloc(module: &Module<B>, n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> Self
+    where
+        Module<B>: VmpPMatAlloc<B>,
+    {
+        let size: usize = k.div_ceil(basek);
+        debug_assert!(digits > 0, "invalid ggsw: `digits` == 0");
+
+        debug_assert!(
+            size > digits,
+            "invalid ggsw: ceil(k/basek): {} <= digits: {}",
+            size,
+            digits
+        );
+
+        assert!(
+            rows * digits <= size,
+            "invalid ggsw: rows: {} * digits:{} > ceil(k/basek): {}",
+            rows,
+            digits,
+            size
+        );
+
+        Self {
+            data: module.vmp_pmat_alloc(n, rows, rank + 1, rank + 1, k.div_ceil(basek)),
+            basek,
+            k: k,
+            digits,
+        }
+    }
+
+    pub fn bytes_of(module: &Module<B>, n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> usize
+    where
+        Module<B>: VmpPMatAllocBytes,
+    {
+        let size: usize = k.div_ceil(basek);
+        debug_assert!(
+            size > digits,
+            "invalid ggsw: ceil(k/basek): {} <= digits: {}",
+            size,
+            digits
+        );
+
+        assert!(
+            rows * digits <= size,
+            "invalid ggsw: rows: {} * digits:{} > ceil(k/basek): {}",
+            rows,
+            digits,
+            size
+        );
+
+        module.vmp_pmat_alloc_bytes(n, rows, rank + 1, rank + 1, size)
+    }
+
+    pub fn from<DataOther: DataRef>(
+        module: &Module<B>,
+        other: &GGSWCiphertext<DataOther>,
+        scratch: &mut Scratch<B>,
+    ) -> GGSWCiphertextExec<Vec<u8>, B>
+    where
+        Module<B>: VmpPMatAlloc<B> + VmpPMatPrepare<B>,
+    {
+        let mut ggsw_exec: GGSWCiphertextExec<Vec<u8>, B> = Self::alloc(
+            module,
+            other.n(),
+            other.basek(),
+            other.k(),
+            other.rows(),
+            other.digits(),
+            other.rank(),
+        );
+        ggsw_exec.prepare(module, other, scratch);
+        ggsw_exec
+    }
+}
+
+impl<D: Data, B: Backend> Infos for GGSWCiphertextExec<D, B> {
+    type Inner = VmpPMat<D, B>;
+
+    fn inner(&self) -> &Self::Inner {
+        &self.data
+    }
+
+    fn basek(&self) -> usize {
+        self.basek
+    }
+
+    fn k(&self) -> usize {
+        self.k
+    }
+}
+
+impl<D: Data, B: Backend> GGSWCiphertextExec<D, B> {
+    pub fn rank(&self) -> usize {
+        self.data.cols_out() - 1
+    }
+
+    pub fn digits(&self) -> usize {
+        self.digits
+    }
+}
+
+impl<DataSelf: DataMut, B: Backend> GGSWCiphertextExec<DataSelf, B> {
+    pub fn prepare<DataOther>(&mut self, module: &Module<B>, other: &GGSWCiphertext<DataOther>, scratch: &mut Scratch<B>)
+    where
+        DataOther: DataRef,
+        Module<B>: VmpPMatPrepare<B>,
+    {
+        module.vmp_prepare(&mut self.data, &other.data, scratch);
+        self.k = other.k;
+        self.basek = other.basek;
+        self.digits = other.digits;
+    }
+}