core refactoring (#69)

core/src/layouts/compressed/gglwe_ksk.rs

@@ -0,0 +1,126 @@
+use backend::hal::{
+    api::{FillUniform, Reset, VecZnxCopy, VecZnxFillUniform},
+    layouts::{Backend, Data, DataMut, DataRef, MatZnx, Module, ReaderFrom, WriterTo},
+};
+
+use crate::{
+    layouts::{GGLWESwitchingKey, Infos, compressed::GGLWECiphertextCompressed},
+    trait_families::Decompress,
+};
+use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
+use std::fmt;
+
+#[derive(PartialEq, Eq, Clone)]
+pub struct GGLWESwitchingKeyCompressed<D: Data> {
+    pub(crate) key: GGLWECiphertextCompressed<D>,
+    pub(crate) sk_in_n: usize,  // Degree of sk_in
+    pub(crate) sk_out_n: usize, // Degree of sk_out
+}
+
+impl<D: DataRef> fmt::Debug for GGLWESwitchingKeyCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self)
+    }
+}
+
+impl<D: DataMut> FillUniform for GGLWESwitchingKeyCompressed<D> {
+    fn fill_uniform(&mut self, source: &mut sampling::source::Source) {
+        self.key.fill_uniform(source);
+    }
+}
+
+impl<D: DataMut> Reset for GGLWESwitchingKeyCompressed<D>
+where
+    MatZnx<D>: Reset,
+{
+    fn reset(&mut self) {
+        self.key.reset();
+        self.sk_in_n = 0;
+        self.sk_out_n = 0;
+    }
+}
+
+impl<D: DataRef> fmt::Display for GGLWESwitchingKeyCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "(GLWESwitchingKeyCompressed: sk_in_n={} sk_out_n={}) {}",
+            self.sk_in_n, self.sk_out_n, self.key.data
+        )
+    }
+}
+
+impl<D: Data> Infos for GGLWESwitchingKeyCompressed<D> {
+    type Inner = MatZnx<D>;
+
+    fn inner(&self) -> &Self::Inner {
+        &self.key.inner()
+    }
+
+    fn basek(&self) -> usize {
+        self.key.basek()
+    }
+
+    fn k(&self) -> usize {
+        self.key.k()
+    }
+}
+
+impl<D: Data> GGLWESwitchingKeyCompressed<D> {
+    pub fn rank(&self) -> usize {
+        self.key.rank()
+    }
+
+    pub fn digits(&self) -> usize {
+        self.key.digits()
+    }
+
+    pub fn rank_in(&self) -> usize {
+        self.key.rank_in()
+    }
+
+    pub fn rank_out(&self) -> usize {
+        self.key.rank_out()
+    }
+}
+
+impl GGLWESwitchingKeyCompressed<Vec<u8>> {
+    pub fn alloc(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank_in: usize, rank_out: usize) -> Self {
+        GGLWESwitchingKeyCompressed {
+            key: GGLWECiphertextCompressed::alloc(n, basek, k, rows, digits, rank_in, rank_out),
+            sk_in_n: 0,
+            sk_out_n: 0,
+        }
+    }
+
+    pub fn bytes_of(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank_in: usize) -> usize {
+        GGLWECiphertextCompressed::bytes_of(n, basek, k, rows, digits, rank_in)
+    }
+}
+
+impl<D: DataMut> ReaderFrom for GGLWESwitchingKeyCompressed<D> {
+    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
+        self.sk_in_n = reader.read_u64::<LittleEndian>()? as usize;
+        self.sk_out_n = reader.read_u64::<LittleEndian>()? as usize;
+        self.key.read_from(reader)
+    }
+}
+
+impl<D: DataRef> WriterTo for GGLWESwitchingKeyCompressed<D> {
+    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
+        writer.write_u64::<LittleEndian>(self.sk_in_n as u64)?;
+        writer.write_u64::<LittleEndian>(self.sk_out_n as u64)?;
+        self.key.write_to(writer)
+    }
+}
+
+impl<D: DataMut, DR: DataRef, B: Backend> Decompress<B, GGLWESwitchingKeyCompressed<DR>> for GGLWESwitchingKey<D> {
+    fn decompress(&mut self, module: &Module<B>, other: &GGLWESwitchingKeyCompressed<DR>)
+    where
+        Module<B>: VecZnxFillUniform + VecZnxCopy,
+    {
+        self.key.decompress(module, &other.key);
+        self.sk_in_n = other.sk_in_n;
+        self.sk_out_n = other.sk_out_n;
+    }
+}