Dev serialization (#64)

* Added compressed serialization for GLWECiphertext + Ciphertext decompression

* Added compressed serialization for GGLWECiphertext & GLWESwitchingkey

* generalized automorphism test

* Removed ops on scalar_znx, replaced by as_vec_znx/as_vec_znx_mut and then call op on vec_znx

* Added tests for automorphism key encryption

* Added tensorkey compressed

* added ggsw compressed

core/src/glwe/layout.rs

@@ -1,17 +1,54 @@
+use std::fmt::Debug;
+
 use backend::hal::{
-    api::{VecZnxAlloc, VecZnxAllocBytes},
+    api::{FillUniform, VecZnxAlloc, VecZnxAllocBytes, VecZnxCopy, VecZnxFillUniform, ZnxInfos, ZnxZero},
     layouts::{Backend, Data, DataMut, DataRef, Module, ReaderFrom, VecZnx, VecZnxToMut, VecZnxToRef, WriterTo},
 };
+use sampling::source::Source;
 
 use crate::{GLWEOps, Infos, SetMetaData};
 
-#[derive(PartialEq, Eq)]
+#[derive(PartialEq, Eq, Clone)]
 pub struct GLWECiphertext<D: Data> {
     pub data: VecZnx<D>,
     pub basek: usize,
     pub k: usize,
 }
 
+impl<D: DataRef> Debug for GLWECiphertext<D> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "GLWECiphertext: basek={} k={}: {}",
+            self.basek(),
+            self.k(),
+            self.data
+        )
+    }
+}
+
+impl<D: DataMut> ZnxZero for GLWECiphertext<D>
+where
+    VecZnx<D>: ZnxZero,
+{
+    fn zero(&mut self) {
+        self.data.zero()
+    }
+
+    fn zero_at(&mut self, i: usize, j: usize) {
+        self.data.zero_at(i, j);
+    }
+}
+
+impl<D: DataMut> FillUniform for GLWECiphertext<D>
+where
+    VecZnx<D>: FillUniform,
+{
+    fn fill_uniform(&mut self, source: &mut Source) {
+        self.data.fill_uniform(source);
+    }
+}
+
 impl GLWECiphertext<Vec<u8>> {
     pub fn alloc<B: Backend>(module: &Module<B>, basek: usize, k: usize, rank: usize) -> Self
     where
@@ -121,3 +158,165 @@ impl<D: DataRef> WriterTo for GLWECiphertext<D> {
         self.data.write_to(writer)
     }
 }
+
+#[derive(PartialEq, Eq, Clone)]
+pub struct GLWECiphertextCompressed<D: Data> {
+    pub(crate) data: VecZnx<D>,
+    pub(crate) basek: usize,
+    pub(crate) k: usize,
+    pub(crate) rank: usize,
+    pub(crate) seed: [u8; 32],
+}
+
+impl<D: DataRef> Debug for GLWECiphertextCompressed<D> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "GLWECiphertext: basek={} k={}: {}",
+            self.basek(),
+            self.k(),
+            self.data
+        )
+    }
+}
+
+impl<D: DataMut> ZnxZero for GLWECiphertextCompressed<D>
+where
+    VecZnx<D>: ZnxZero,
+{
+    fn zero(&mut self) {
+        self.data.zero()
+    }
+
+    fn zero_at(&mut self, i: usize, j: usize) {
+        self.data.zero_at(i, j);
+    }
+}
+
+impl<D: DataMut> FillUniform for GLWECiphertextCompressed<D>
+where
+    VecZnx<D>: FillUniform,
+{
+    fn fill_uniform(&mut self, source: &mut Source) {
+        self.data.fill_uniform(source);
+    }
+}
+
+impl<D: Data> Infos for GLWECiphertextCompressed<D> {
+    type Inner = VecZnx<D>;
+
+    fn inner(&self) -> &Self::Inner {
+        &self.data
+    }
+
+    fn basek(&self) -> usize {
+        self.basek
+    }
+
+    fn k(&self) -> usize {
+        self.k
+    }
+}
+
+impl<D: Data> GLWECiphertextCompressed<D> {
+    pub fn rank(&self) -> usize {
+        self.rank
+    }
+}
+
+impl GLWECiphertextCompressed<Vec<u8>> {
+    pub fn alloc<B: Backend>(module: &Module<B>, basek: usize, k: usize, rank: usize) -> Self
+    where
+        Module<B>: VecZnxAlloc,
+    {
+        Self {
+            data: module.vec_znx_alloc(1, k.div_ceil(basek)),
+            basek,
+            k,
+            rank,
+            seed: [0u8; 32],
+        }
+    }
+
+    pub fn bytes_of<B: Backend>(module: &Module<B>, basek: usize, k: usize) -> usize
+    where
+        Module<B>: VecZnxAllocBytes,
+    {
+        GLWECiphertext::bytes_of(module, basek, k, 1)
+    }
+}
+
+impl<D: DataMut> ReaderFrom for GLWECiphertextCompressed<D> {
+    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
+        self.k = reader.read_u64::<LittleEndian>()? as usize;
+        self.basek = reader.read_u64::<LittleEndian>()? as usize;
+        self.rank = reader.read_u64::<LittleEndian>()? as usize;
+        reader.read(&mut self.seed)?;
+        self.data.read_from(reader)
+    }
+}
+
+impl<D: DataRef> WriterTo for GLWECiphertextCompressed<D> {
+    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
+        writer.write_u64::<LittleEndian>(self.k as u64)?;
+        writer.write_u64::<LittleEndian>(self.basek as u64)?;
+        writer.write_u64::<LittleEndian>(self.rank as u64)?;
+        writer.write_all(&self.seed)?;
+        self.data.write_to(writer)
+    }
+}
+
+impl<D: DataMut> GLWECiphertext<D> {
+    pub fn decompress<DataOther, B: Backend>(&mut self, module: &Module<B>, other: &GLWECiphertextCompressed<DataOther>)
+    where
+        DataOther: DataRef,
+        Module<B>: VecZnxFillUniform + VecZnxCopy,
+    {
+        #[cfg(debug_assertions)]
+        {
+            assert_eq!(
+                self.n(),
+                other.data.n(),
+                "invalid receiver: self.n()={} != other.n()={}",
+                self.n(),
+                other.data.n()
+            );
+            assert_eq!(
+                self.size(),
+                other.size(),
+                "invalid receiver: self.size()={} != other.size()={}",
+                self.size(),
+                other.size()
+            );
+            assert_eq!(
+                self.rank(),
+                other.rank(),
+                "invalid receiver: self.rank()={} != other.rank()={}",
+                self.rank(),
+                other.rank()
+            );
+            let mut source: Source = Source::new(other.seed);
+            self.decompress_internal(module, other, &mut source);
+        }
+    }
+
+    pub(crate) fn decompress_internal<DataOther, B: Backend>(
+        &mut self,
+        module: &Module<B>,
+        other: &GLWECiphertextCompressed<DataOther>,
+        source: &mut Source,
+    ) where
+        DataOther: DataRef,
+        Module<B>: VecZnxFillUniform + VecZnxCopy,
+    {
+        let k: usize = other.k;
+        let basek: usize = other.basek;
+        let cols: usize = other.cols();
+        module.vec_znx_copy(&mut self.data, 0, &other.data, 0);
+        (1..cols).for_each(|i| {
+            module.vec_znx_fill_uniform(basek, &mut self.data, i, k, source);
+        });
+        self.basek = basek;
+        self.k = k;
+    }
+}