updated repo for publishing (#74)

poulpy-core/src/layouts/compressed/gglwe_atk.rs

@@ -0,0 +1,117 @@
+use poulpy_backend::hal::{
+    api::{FillUniform, Reset, VecZnxCopy, VecZnxFillUniform},
+    layouts::{Backend, Data, DataMut, DataRef, MatZnx, Module, ReaderFrom, WriterTo},
+    source::Source,
+};
+
+use crate::layouts::{
+    GGLWEAutomorphismKey, Infos,
+    compressed::{Decompress, GGLWESwitchingKeyCompressed},
+};
+use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
+use std::fmt;
+
+#[derive(PartialEq, Eq, Clone)]
+pub struct GGLWEAutomorphismKeyCompressed<D: Data> {
+    pub(crate) key: GGLWESwitchingKeyCompressed<D>,
+    pub(crate) p: i64,
+}
+
+impl<D: DataRef> fmt::Debug for GGLWEAutomorphismKeyCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self)
+    }
+}
+
+impl<D: DataMut> FillUniform for GGLWEAutomorphismKeyCompressed<D> {
+    fn fill_uniform(&mut self, source: &mut Source) {
+        self.key.fill_uniform(source);
+    }
+}
+
+impl<D: DataMut> Reset for GGLWEAutomorphismKeyCompressed<D>
+where
+    MatZnx<D>: Reset,
+{
+    fn reset(&mut self) {
+        self.key.reset();
+        self.p = 0;
+    }
+}
+
+impl<D: DataRef> fmt::Display for GGLWEAutomorphismKeyCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "(AutomorphismKeyCompressed: p={}) {}", self.p, self.key)
+    }
+}
+
+impl GGLWEAutomorphismKeyCompressed<Vec<u8>> {
+    pub fn alloc(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> Self {
+        GGLWEAutomorphismKeyCompressed {
+            key: GGLWESwitchingKeyCompressed::alloc(n, basek, k, rows, digits, rank, rank),
+            p: 0,
+        }
+    }
+
+    pub fn bytes_of(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> usize {
+        GGLWESwitchingKeyCompressed::<Vec<u8>>::bytes_of(n, basek, k, rows, digits, rank)
+    }
+}
+
+impl<D: Data> Infos for GGLWEAutomorphismKeyCompressed<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> GGLWEAutomorphismKeyCompressed<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<D: DataMut> ReaderFrom for GGLWEAutomorphismKeyCompressed<D> {
+    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
+        self.p = reader.read_u64::<LittleEndian>()? as i64;
+        self.key.read_from(reader)
+    }
+}
+
+impl<D: DataRef> WriterTo for GGLWEAutomorphismKeyCompressed<D> {
+    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
+        writer.write_u64::<LittleEndian>(self.p as u64)?;
+        self.key.write_to(writer)
+    }
+}
+
+impl<D: DataMut, DR: DataRef, B: Backend> Decompress<B, GGLWEAutomorphismKeyCompressed<DR>> for GGLWEAutomorphismKey<D> {
+    fn decompress(&mut self, module: &Module<B>, other: &GGLWEAutomorphismKeyCompressed<DR>)
+    where
+        Module<B>: VecZnxFillUniform + VecZnxCopy,
+    {
+        self.key.decompress(module, &other.key);
+        self.p = other.p;
+    }
+}

poulpy-core/src/layouts/compressed/gglwe_ct.rs

@@ -0,0 +1,254 @@
+use poulpy_backend::hal::{
+    api::{FillUniform, Reset, VecZnxCopy, VecZnxFillUniform},
+    layouts::{Backend, Data, DataMut, DataRef, MatZnx, Module, ReaderFrom, WriterTo},
+    source::Source,
+};
+
+use crate::layouts::{
+    GGLWECiphertext, Infos,
+    compressed::{Decompress, GLWECiphertextCompressed},
+};
+use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
+use std::fmt;
+
+#[derive(PartialEq, Eq, Clone)]
+pub struct GGLWECiphertextCompressed<D: Data> {
+    pub(crate) data: MatZnx<D>,
+    pub(crate) basek: usize,
+    pub(crate) k: usize,
+    pub(crate) rank_out: usize,
+    pub(crate) digits: usize,
+    pub(crate) seed: Vec<[u8; 32]>,
+}
+
+impl<D: DataRef> fmt::Debug for GGLWECiphertextCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self)
+    }
+}
+
+impl<D: DataMut> FillUniform for GGLWECiphertextCompressed<D> {
+    fn fill_uniform(&mut self, source: &mut Source) {
+        self.data.fill_uniform(source);
+    }
+}
+
+impl<D: DataMut> Reset for GGLWECiphertextCompressed<D>
+where
+    MatZnx<D>: Reset,
+{
+    fn reset(&mut self) {
+        self.data.reset();
+        self.basek = 0;
+        self.k = 0;
+        self.digits = 0;
+        self.rank_out = 0;
+        self.seed = Vec::new();
+    }
+}
+
+impl<D: DataRef> fmt::Display for GGLWECiphertextCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "(GGLWECiphertextCompressed: basek={} k={} digits={}) {}",
+            self.basek, self.k, self.digits, self.data
+        )
+    }
+}
+
+impl GGLWECiphertextCompressed<Vec<u8>> {
+    pub fn alloc(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank_in: usize, rank_out: usize) -> Self {
+        let size: usize = k.div_ceil(basek);
+        debug_assert!(
+            size > digits,
+            "invalid gglwe: ceil(k/basek): {} <= digits: {}",
+            size,
+            digits
+        );
+
+        assert!(
+            rows * digits <= size,
+            "invalid gglwe: rows: {} * digits:{} > ceil(k/basek): {}",
+            rows,
+            digits,
+            size
+        );
+
+        Self {
+            data: MatZnx::alloc(n, rows, rank_in, 1, size),
+            basek,
+            k,
+            rank_out,
+            digits,
+            seed: vec![[0u8; 32]; rows * rank_in],
+        }
+    }
+
+    pub fn bytes_of(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank_in: usize) -> usize {
+        let size: usize = k.div_ceil(basek);
+        debug_assert!(
+            size > digits,
+            "invalid gglwe: ceil(k/basek): {} <= digits: {}",
+            size,
+            digits
+        );
+
+        assert!(
+            rows * digits <= size,
+            "invalid gglwe: rows: {} * digits:{} > ceil(k/basek): {}",
+            rows,
+            digits,
+            size
+        );
+
+        MatZnx::alloc_bytes(n, rows, rank_in, 1, rows)
+    }
+}
+
+impl<D: Data> Infos for GGLWECiphertextCompressed<D> {
+    type Inner = MatZnx<D>;
+
+    fn inner(&self) -> &Self::Inner {
+        &self.data
+    }
+
+    fn basek(&self) -> usize {
+        self.basek
+    }
+
+    fn k(&self) -> usize {
+        self.k
+    }
+}
+
+impl<D: Data> GGLWECiphertextCompressed<D> {
+    pub fn rank(&self) -> usize {
+        self.rank_out
+    }
+
+    pub fn digits(&self) -> usize {
+        self.digits
+    }
+
+    pub fn rank_in(&self) -> usize {
+        self.data.cols_in()
+    }
+
+    pub fn rank_out(&self) -> usize {
+        self.rank_out
+    }
+}
+
+impl<D: DataRef> GGLWECiphertextCompressed<D> {
+    pub(crate) fn at(&self, row: usize, col: usize) -> GLWECiphertextCompressed<&[u8]> {
+        GLWECiphertextCompressed {
+            data: self.data.at(row, col),
+            basek: self.basek,
+            k: self.k,
+            rank: self.rank_out,
+            seed: self.seed[self.rank_in() * row + col],
+        }
+    }
+}
+
+impl<D: DataMut> GGLWECiphertextCompressed<D> {
+    pub(crate) fn at_mut(&mut self, row: usize, col: usize) -> GLWECiphertextCompressed<&mut [u8]> {
+        let rank_in: usize = self.rank_in();
+        GLWECiphertextCompressed {
+            data: self.data.at_mut(row, col),
+            basek: self.basek,
+            k: self.k,
+            rank: self.rank_out,
+            seed: self.seed[rank_in * row + col], // Warning: value is copied and not borrow mut
+        }
+    }
+}
+
+impl<D: DataMut> ReaderFrom for GGLWECiphertextCompressed<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.digits = reader.read_u64::<LittleEndian>()? as usize;
+        self.rank_out = reader.read_u64::<LittleEndian>()? as usize;
+        let seed_len = reader.read_u64::<LittleEndian>()? as usize;
+        self.seed = vec![[0u8; 32]; seed_len];
+        for s in &mut self.seed {
+            reader.read_exact(s)?;
+        }
+        self.data.read_from(reader)
+    }
+}
+
+impl<D: DataRef> WriterTo for GGLWECiphertextCompressed<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.digits as u64)?;
+        writer.write_u64::<LittleEndian>(self.rank_out as u64)?;
+        writer.write_u64::<LittleEndian>(self.seed.len() as u64)?;
+        for s in &self.seed {
+            writer.write_all(s)?;
+        }
+        self.data.write_to(writer)
+    }
+}
+
+impl<D: DataMut, B: Backend, DR: DataRef> Decompress<B, GGLWECiphertextCompressed<DR>> for GGLWECiphertext<D> {
+    fn decompress(&mut self, module: &Module<B>, other: &GGLWECiphertextCompressed<DR>)
+    where
+        Module<B>: VecZnxFillUniform + VecZnxCopy,
+    {
+        #[cfg(debug_assertions)]
+        {
+            use poulpy_backend::hal::api::ZnxInfos;
+
+            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_in(),
+                other.rank_in(),
+                "invalid receiver: self.rank_in()={} != other.rank_in()={}",
+                self.rank_in(),
+                other.rank_in()
+            );
+            assert_eq!(
+                self.rank_out(),
+                other.rank_out(),
+                "invalid receiver: self.rank_out()={} != other.rank_out()={}",
+                self.rank_out(),
+                other.rank_out()
+            );
+
+            assert_eq!(
+                self.rows(),
+                other.rows(),
+                "invalid receiver: self.rows()={} != other.rows()={}",
+                self.rows(),
+                other.rows()
+            );
+        }
+
+        let rank_in: usize = self.rank_in();
+        let rows: usize = self.rows();
+
+        (0..rank_in).for_each(|col_i| {
+            (0..rows).for_each(|row_i| {
+                self.at_mut(row_i, col_i)
+                    .decompress(module, &other.at(row_i, col_i));
+            });
+        });
+    }
+}

poulpy-core/src/layouts/compressed/gglwe_ksk.rs

@@ -0,0 +1,127 @@
+use poulpy_backend::hal::{
+    api::{FillUniform, Reset, VecZnxCopy, VecZnxFillUniform},
+    layouts::{Backend, Data, DataMut, DataRef, MatZnx, Module, ReaderFrom, WriterTo},
+    source::Source,
+};
+
+use crate::layouts::{
+    GGLWESwitchingKey, Infos,
+    compressed::{Decompress, GGLWECiphertextCompressed},
+};
+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 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;
+    }
+}

poulpy-core/src/layouts/compressed/gglwe_tsk.rs

@@ -0,0 +1,165 @@
+use poulpy_backend::hal::{
+    api::{FillUniform, Reset, VecZnxCopy, VecZnxFillUniform},
+    layouts::{Backend, Data, DataMut, DataRef, MatZnx, Module, ReaderFrom, WriterTo},
+    source::Source,
+};
+
+use crate::layouts::{
+    GGLWETensorKey, Infos,
+    compressed::{Decompress, GGLWESwitchingKeyCompressed},
+};
+use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
+use std::fmt;
+
+#[derive(PartialEq, Eq, Clone)]
+pub struct GGLWETensorKeyCompressed<D: Data> {
+    pub(crate) keys: Vec<GGLWESwitchingKeyCompressed<D>>,
+}
+
+impl<D: DataRef> fmt::Debug for GGLWETensorKeyCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self)
+    }
+}
+
+impl<D: DataMut> FillUniform for GGLWETensorKeyCompressed<D> {
+    fn fill_uniform(&mut self, source: &mut Source) {
+        self.keys
+            .iter_mut()
+            .for_each(|key: &mut GGLWESwitchingKeyCompressed<D>| key.fill_uniform(source))
+    }
+}
+
+impl<D: DataMut> Reset for GGLWETensorKeyCompressed<D>
+where
+    MatZnx<D>: Reset,
+{
+    fn reset(&mut self) {
+        self.keys
+            .iter_mut()
+            .for_each(|key: &mut GGLWESwitchingKeyCompressed<D>| key.reset())
+    }
+}
+
+impl<D: DataRef> fmt::Display for GGLWETensorKeyCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        writeln!(f, "(GLWETensorKeyCompressed)",)?;
+        for (i, key) in self.keys.iter().enumerate() {
+            write!(f, "{}: {}", i, key)?;
+        }
+        Ok(())
+    }
+}
+
+impl GGLWETensorKeyCompressed<Vec<u8>> {
+    pub fn alloc(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> Self {
+        let mut keys: Vec<GGLWESwitchingKeyCompressed<Vec<u8>>> = Vec::new();
+        let pairs: usize = (((rank + 1) * rank) >> 1).max(1);
+        (0..pairs).for_each(|_| {
+            keys.push(GGLWESwitchingKeyCompressed::alloc(
+                n, basek, k, rows, digits, 1, rank,
+            ));
+        });
+        Self { keys }
+    }
+
+    pub fn bytes_of(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> usize {
+        let pairs: usize = (((rank + 1) * rank) >> 1).max(1);
+        pairs * GGLWESwitchingKeyCompressed::bytes_of(n, basek, k, rows, digits, 1)
+    }
+}
+
+impl<D: Data> Infos for GGLWETensorKeyCompressed<D> {
+    type Inner = MatZnx<D>;
+
+    fn inner(&self) -> &Self::Inner {
+        self.keys[0].inner()
+    }
+
+    fn basek(&self) -> usize {
+        self.keys[0].basek()
+    }
+
+    fn k(&self) -> usize {
+        self.keys[0].k()
+    }
+}
+
+impl<D: Data> GGLWETensorKeyCompressed<D> {
+    pub fn rank(&self) -> usize {
+        self.keys[0].rank()
+    }
+
+    pub fn digits(&self) -> usize {
+        self.keys[0].digits()
+    }
+
+    pub fn rank_in(&self) -> usize {
+        self.keys[0].rank_in()
+    }
+
+    pub fn rank_out(&self) -> usize {
+        self.keys[0].rank_out()
+    }
+}
+
+impl<D: DataMut> ReaderFrom for GGLWETensorKeyCompressed<D> {
+    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
+        let len: usize = reader.read_u64::<LittleEndian>()? as usize;
+        if self.keys.len() != len {
+            return Err(std::io::Error::new(
+                std::io::ErrorKind::InvalidData,
+                format!("self.keys.len()={} != read len={}", self.keys.len(), len),
+            ));
+        }
+        for key in &mut self.keys {
+            key.read_from(reader)?;
+        }
+        Ok(())
+    }
+}
+
+impl<D: DataRef> WriterTo for GGLWETensorKeyCompressed<D> {
+    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
+        writer.write_u64::<LittleEndian>(self.keys.len() as u64)?;
+        for key in &self.keys {
+            key.write_to(writer)?;
+        }
+        Ok(())
+    }
+}
+
+impl<D: DataMut> GGLWETensorKeyCompressed<D> {
+    pub(crate) fn at_mut(&mut self, mut i: usize, mut j: usize) -> &mut GGLWESwitchingKeyCompressed<D> {
+        if i > j {
+            std::mem::swap(&mut i, &mut j);
+        };
+        let rank: usize = self.rank();
+        &mut self.keys[i * rank + j - (i * (i + 1) / 2)]
+    }
+}
+
+impl<D: DataMut, DR: DataRef, B: Backend> Decompress<B, GGLWETensorKeyCompressed<DR>> for GGLWETensorKey<D> {
+    fn decompress(&mut self, module: &Module<B>, other: &GGLWETensorKeyCompressed<DR>)
+    where
+        Module<B>: VecZnxFillUniform + VecZnxCopy,
+    {
+        #[cfg(debug_assertions)]
+        {
+            assert_eq!(
+                self.keys.len(),
+                other.keys.len(),
+                "invalid receiver: self.keys.len()={} != other.keys.len()={}",
+                self.keys.len(),
+                other.keys.len()
+            );
+        }
+
+        self.keys
+            .iter_mut()
+            .zip(other.keys.iter())
+            .for_each(|(a, b)| {
+                a.decompress(module, b);
+            });
+    }
+}

poulpy-core/src/layouts/compressed/ggsw_ct.rs

@@ -0,0 +1,207 @@
+use poulpy_backend::hal::{
+    api::{FillUniform, Reset, VecZnxCopy, VecZnxFillUniform},
+    layouts::{Backend, Data, DataMut, DataRef, MatZnx, Module, ReaderFrom, WriterTo},
+    source::Source,
+};
+
+use crate::layouts::{
+    GGSWCiphertext, Infos,
+    compressed::{Decompress, GLWECiphertextCompressed},
+};
+use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
+use std::fmt;
+
+#[derive(PartialEq, Eq, Clone)]
+pub struct GGSWCiphertextCompressed<D: Data> {
+    pub(crate) data: MatZnx<D>,
+    pub(crate) basek: usize,
+    pub(crate) k: usize,
+    pub(crate) digits: usize,
+    pub(crate) rank: usize,
+    pub(crate) seed: Vec<[u8; 32]>,
+}
+
+impl<D: DataRef> fmt::Debug for GGSWCiphertextCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self.data)
+    }
+}
+
+impl<D: DataRef> fmt::Display for GGSWCiphertextCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "(GGSWCiphertextCompressed: basek={} k={} digits={}) {}",
+            self.basek, self.k, self.digits, self.data
+        )
+    }
+}
+
+impl<D: DataMut> Reset for GGSWCiphertextCompressed<D> {
+    fn reset(&mut self) {
+        self.data.reset();
+        self.basek = 0;
+        self.k = 0;
+        self.digits = 0;
+        self.rank = 0;
+        self.seed = Vec::new();
+    }
+}
+
+impl<D: DataMut> FillUniform for GGSWCiphertextCompressed<D> {
+    fn fill_uniform(&mut self, source: &mut Source) {
+        self.data.fill_uniform(source);
+    }
+}
+
+impl GGSWCiphertextCompressed<Vec<u8>> {
+    pub fn alloc(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> Self {
+        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: MatZnx::alloc(n, rows, rank + 1, 1, k.div_ceil(basek)),
+            basek,
+            k,
+            digits,
+            rank,
+            seed: Vec::new(),
+        }
+    }
+
+    pub fn bytes_of(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> usize {
+        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
+        );
+
+        MatZnx::alloc_bytes(n, rows, rank + 1, 1, size)
+    }
+}
+
+impl<D: DataRef> GGSWCiphertextCompressed<D> {
+    pub fn at(&self, row: usize, col: usize) -> GLWECiphertextCompressed<&[u8]> {
+        GLWECiphertextCompressed {
+            data: self.data.at(row, col),
+            basek: self.basek,
+            k: self.k,
+            rank: self.rank(),
+            seed: self.seed[row * (self.rank() + 1) + col],
+        }
+    }
+}
+
+impl<D: DataMut> GGSWCiphertextCompressed<D> {
+    pub fn at_mut(&mut self, row: usize, col: usize) -> GLWECiphertextCompressed<&mut [u8]> {
+        let rank: usize = self.rank();
+        GLWECiphertextCompressed {
+            data: self.data.at_mut(row, col),
+            basek: self.basek,
+            k: self.k,
+            rank,
+            seed: self.seed[row * (rank + 1) + col],
+        }
+    }
+}
+
+impl<D: Data> Infos for GGSWCiphertextCompressed<D> {
+    type Inner = MatZnx<D>;
+
+    fn inner(&self) -> &Self::Inner {
+        &self.data
+    }
+
+    fn basek(&self) -> usize {
+        self.basek
+    }
+
+    fn k(&self) -> usize {
+        self.k
+    }
+}
+
+impl<D: Data> GGSWCiphertextCompressed<D> {
+    pub fn rank(&self) -> usize {
+        self.rank
+    }
+
+    pub fn digits(&self) -> usize {
+        self.digits
+    }
+}
+
+impl<D: DataMut> ReaderFrom for GGSWCiphertextCompressed<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.digits = reader.read_u64::<LittleEndian>()? as usize;
+        self.rank = reader.read_u64::<LittleEndian>()? as usize;
+        let seed_len = reader.read_u64::<LittleEndian>()? as usize;
+        self.seed = vec![[0u8; 32]; seed_len];
+        for s in &mut self.seed {
+            reader.read_exact(s)?;
+        }
+        self.data.read_from(reader)
+    }
+}
+
+impl<D: DataRef> WriterTo for GGSWCiphertextCompressed<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.digits as u64)?;
+        writer.write_u64::<LittleEndian>(self.rank as u64)?;
+        writer.write_u64::<LittleEndian>(self.seed.len() as u64)?;
+        for s in &self.seed {
+            writer.write_all(s)?;
+        }
+        self.data.write_to(writer)
+    }
+}
+
+impl<D: DataMut, B: Backend, DR: DataRef> Decompress<B, GGSWCiphertextCompressed<DR>> for GGSWCiphertext<D> {
+    fn decompress(&mut self, module: &Module<B>, other: &GGSWCiphertextCompressed<DR>)
+    where
+        Module<B>: VecZnxFillUniform + VecZnxCopy,
+    {
+        #[cfg(debug_assertions)]
+        {
+            assert_eq!(self.rank(), other.rank())
+        }
+
+        let rows: usize = self.rows();
+        let rank: usize = self.rank();
+        (0..rows).for_each(|row_i| {
+            (0..rank + 1).for_each(|col_j| {
+                self.at_mut(row_i, col_j)
+                    .decompress(module, &other.at(row_i, col_j));
+            });
+        });
+    }
+}

poulpy-core/src/layouts/compressed/glwe_ct.rs

@@ -0,0 +1,177 @@
+use poulpy_backend::hal::{
+    api::{FillUniform, Reset, VecZnxCopy, VecZnxFillUniform},
+    layouts::{Backend, Data, DataMut, DataRef, Module, ReaderFrom, VecZnx, WriterTo},
+    source::Source,
+};
+
+use crate::layouts::{GLWECiphertext, Infos, compressed::Decompress};
+use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
+use std::fmt;
+
+#[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> fmt::Debug for GLWECiphertextCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self)
+    }
+}
+
+impl<D: DataRef> fmt::Display for GLWECiphertextCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "GLWECiphertextCompressed: basek={} k={} rank={} seed={:?}: {}",
+            self.basek(),
+            self.k(),
+            self.rank,
+            self.seed,
+            self.data
+        )
+    }
+}
+
+impl<D: DataMut> Reset for GLWECiphertextCompressed<D> {
+    fn reset(&mut self) {
+        self.data.reset();
+        self.basek = 0;
+        self.k = 0;
+        self.rank = 0;
+        self.seed = [0u8; 32];
+    }
+}
+
+impl<D: DataMut> FillUniform for GLWECiphertextCompressed<D> {
+    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(n: usize, basek: usize, k: usize, rank: usize) -> Self {
+        Self {
+            data: VecZnx::alloc(n, 1, k.div_ceil(basek)),
+            basek,
+            k,
+            rank,
+            seed: [0u8; 32],
+        }
+    }
+
+    pub fn bytes_of(n: usize, basek: usize, k: usize) -> usize {
+        GLWECiphertext::bytes_of(n, 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_exact(&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, B: Backend, DR: DataRef> Decompress<B, GLWECiphertextCompressed<DR>> for GLWECiphertext<D> {
+    fn decompress(&mut self, module: &Module<B>, other: &GLWECiphertextCompressed<DR>)
+    where
+        Module<B>: VecZnxCopy + VecZnxFillUniform,
+    {
+        #[cfg(debug_assertions)]
+        {
+            use poulpy_backend::hal::api::ZnxInfos;
+
+            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);
+    }
+}
+
+impl<D: DataMut> GLWECiphertext<D> {
+    pub(crate) fn decompress_internal<DataOther, B: Backend>(
+        &mut self,
+        module: &Module<B>,
+        other: &GLWECiphertextCompressed<DataOther>,
+        source: &mut Source,
+    ) where
+        DataOther: DataRef,
+        Module<B>: VecZnxCopy + VecZnxFillUniform,
+    {
+        #[cfg(debug_assertions)]
+        {
+            assert_eq!(self.rank(), other.rank())
+        }
+
+        let k: usize = other.k;
+        let basek: usize = other.basek;
+        let cols: usize = other.rank() + 1;
+        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;
+    }
+}

poulpy-core/src/layouts/compressed/glwe_to_lwe_ksk.rs

@@ -0,0 +1,117 @@
+use std::fmt;
+
+use poulpy_backend::hal::{
+    api::{FillUniform, Reset},
+    api::{
+        SvpApplyInplace, SvpPPolAlloc, SvpPPolAllocBytes, SvpPrepare, VecZnxAddInplace, VecZnxAddNormal, VecZnxBigNormalize,
+        VecZnxDftAllocBytes, VecZnxDftFromVecZnx, VecZnxDftToVecZnxBigConsume, VecZnxFillUniform, VecZnxNormalize,
+        VecZnxNormalizeInplace, VecZnxNormalizeTmpBytes, VecZnxSub, VecZnxSubABInplace,
+    },
+    layouts::{Backend, Data, DataMut, DataRef, MatZnx, Module, ReaderFrom, WriterTo},
+    source::Source,
+};
+
+use crate::layouts::{GLWEToLWESwitchingKey, Infos, compressed::GGLWESwitchingKeyCompressed};
+
+#[derive(PartialEq, Eq, Clone)]
+pub struct GLWEToLWESwitchingKeyCompressed<D: Data>(pub(crate) GGLWESwitchingKeyCompressed<D>);
+
+impl<D: DataRef> fmt::Debug for GLWEToLWESwitchingKeyCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self)
+    }
+}
+
+impl<D: DataMut> FillUniform for GLWEToLWESwitchingKeyCompressed<D> {
+    fn fill_uniform(&mut self, source: &mut Source) {
+        self.0.fill_uniform(source);
+    }
+}
+
+impl<D: DataMut> Reset for GLWEToLWESwitchingKeyCompressed<D> {
+    fn reset(&mut self) {
+        self.0.reset();
+    }
+}
+
+impl<D: DataRef> fmt::Display for GLWEToLWESwitchingKeyCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "(GLWEToLWESwitchingKeyCompressed) {}", self.0)
+    }
+}
+
+impl<D: Data> Infos for GLWEToLWESwitchingKeyCompressed<D> {
+    type Inner = MatZnx<D>;
+
+    fn inner(&self) -> &Self::Inner {
+        self.0.inner()
+    }
+
+    fn basek(&self) -> usize {
+        self.0.basek()
+    }
+
+    fn k(&self) -> usize {
+        self.0.k()
+    }
+}
+
+impl<D: Data> GLWEToLWESwitchingKeyCompressed<D> {
+    pub fn digits(&self) -> usize {
+        self.0.digits()
+    }
+
+    pub fn rank(&self) -> usize {
+        self.0.rank()
+    }
+
+    pub fn rank_in(&self) -> usize {
+        self.0.rank_in()
+    }
+
+    pub fn rank_out(&self) -> usize {
+        self.0.rank_out()
+    }
+}
+
+impl<D: DataMut> ReaderFrom for GLWEToLWESwitchingKeyCompressed<D> {
+    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
+        self.0.read_from(reader)
+    }
+}
+
+impl<D: DataRef> WriterTo for GLWEToLWESwitchingKeyCompressed<D> {
+    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
+        self.0.write_to(writer)
+    }
+}
+
+impl GLWEToLWESwitchingKeyCompressed<Vec<u8>> {
+    pub fn alloc(n: usize, basek: usize, k: usize, rows: usize, rank_in: usize) -> Self {
+        Self(GGLWESwitchingKeyCompressed::alloc(
+            n, basek, k, rows, 1, rank_in, 1,
+        ))
+    }
+
+    pub fn encrypt_sk_scratch_space<B: Backend>(module: &Module<B>, n: usize, basek: usize, k: usize, rank_in: usize) -> usize
+    where
+        Module<B>: VecZnxDftAllocBytes
+            + VecZnxBigNormalize<B>
+            + VecZnxDftFromVecZnx<B>
+            + SvpApplyInplace<B>
+            + VecZnxDftToVecZnxBigConsume<B>
+            + VecZnxNormalizeTmpBytes
+            + VecZnxFillUniform
+            + VecZnxSubABInplace
+            + VecZnxAddInplace
+            + VecZnxNormalizeInplace<B>
+            + VecZnxAddNormal
+            + VecZnxNormalize<B>
+            + VecZnxSub
+            + SvpPrepare<B>
+            + SvpPPolAllocBytes
+            + SvpPPolAlloc<B>,
+    {
+        GLWEToLWESwitchingKey::encrypt_sk_scratch_space(module, n, basek, k, rank_in)
+    }
+}

poulpy-core/src/layouts/compressed/lwe_ct.rs

@@ -0,0 +1,131 @@
+use std::fmt;
+
+use poulpy_backend::hal::{
+    api::{FillUniform, Reset, VecZnxFillUniform, ZnxInfos, ZnxView, ZnxViewMut},
+    layouts::{Backend, Data, DataMut, DataRef, Module, ReaderFrom, VecZnx, WriterTo},
+    source::Source,
+};
+
+use crate::layouts::{Infos, LWECiphertext, SetMetaData, compressed::Decompress};
+
+#[derive(PartialEq, Eq, Clone)]
+pub struct LWECiphertextCompressed<D: Data> {
+    pub(crate) data: VecZnx<D>,
+    pub(crate) k: usize,
+    pub(crate) basek: usize,
+    pub(crate) seed: [u8; 32],
+}
+
+impl<D: DataRef> fmt::Debug for LWECiphertextCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self)
+    }
+}
+
+impl<D: DataRef> fmt::Display for LWECiphertextCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "LWECiphertextCompressed: basek={} k={} seed={:?}: {}",
+            self.basek(),
+            self.k(),
+            self.seed,
+            self.data
+        )
+    }
+}
+
+impl<D: DataMut> Reset for LWECiphertextCompressed<D>
+where
+    VecZnx<D>: Reset,
+{
+    fn reset(&mut self) {
+        self.data.reset();
+        self.basek = 0;
+        self.k = 0;
+        self.seed = [0u8; 32];
+    }
+}
+
+impl<D: DataMut> FillUniform for LWECiphertextCompressed<D> {
+    fn fill_uniform(&mut self, source: &mut Source) {
+        self.data.fill_uniform(source);
+    }
+}
+
+impl LWECiphertextCompressed<Vec<u8>> {
+    pub fn alloc(basek: usize, k: usize) -> Self {
+        Self {
+            data: VecZnx::alloc(1, 1, k.div_ceil(basek)),
+            k,
+            basek,
+            seed: [0u8; 32],
+        }
+    }
+}
+
+impl<D: Data> Infos for LWECiphertextCompressed<D>
+where
+    VecZnx<D>: ZnxInfos,
+{
+    type Inner = VecZnx<D>;
+
+    fn n(&self) -> usize {
+        &self.inner().n() - 1
+    }
+
+    fn inner(&self) -> &Self::Inner {
+        &self.data
+    }
+
+    fn basek(&self) -> usize {
+        self.basek
+    }
+
+    fn k(&self) -> usize {
+        self.k
+    }
+}
+
+impl<DataSelf: DataMut> SetMetaData for LWECiphertextCompressed<DataSelf> {
+    fn set_k(&mut self, k: usize) {
+        self.k = k
+    }
+
+    fn set_basek(&mut self, basek: usize) {
+        self.basek = basek
+    }
+}
+
+use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
+
+impl<D: DataMut> ReaderFrom for LWECiphertextCompressed<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;
+        reader.read_exact(&mut self.seed)?;
+        self.data.read_from(reader)
+    }
+}
+
+impl<D: DataRef> WriterTo for LWECiphertextCompressed<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_all(&self.seed)?;
+        self.data.write_to(writer)
+    }
+}
+
+impl<D: DataMut, B: Backend, DR: DataRef> Decompress<B, LWECiphertextCompressed<DR>> for LWECiphertext<D> {
+    fn decompress(&mut self, module: &Module<B>, other: &LWECiphertextCompressed<DR>)
+    where
+        Module<B>: VecZnxFillUniform,
+    {
+        let mut source = Source::new(other.seed);
+        module.vec_znx_fill_uniform(other.basek(), &mut self.data, 0, other.k(), &mut source);
+        (0..self.size()).for_each(|i| {
+            self.data.at_mut(0, i)[0] = other.data.at(0, i)[0];
+        });
+    }
+}

poulpy-core/src/layouts/compressed/lwe_ksk.rs

@@ -0,0 +1,127 @@
+use poulpy_backend::hal::{
+    api::{
+        FillUniform, Reset, SvpApplyInplace, SvpPPolAlloc, SvpPPolAllocBytes, SvpPrepare, VecZnxAddInplace, VecZnxAddNormal,
+        VecZnxBigNormalize, VecZnxCopy, VecZnxDftAllocBytes, VecZnxDftFromVecZnx, VecZnxDftToVecZnxBigConsume, VecZnxFillUniform,
+        VecZnxNormalize, VecZnxNormalizeInplace, VecZnxNormalizeTmpBytes, VecZnxSub, VecZnxSubABInplace,
+    },
+    layouts::{Backend, Data, DataMut, DataRef, MatZnx, Module, ReaderFrom, WriterTo},
+    source::Source,
+};
+
+use crate::layouts::{
+    Infos, LWESwitchingKey,
+    compressed::{Decompress, GGLWESwitchingKeyCompressed},
+};
+use std::fmt;
+
+#[derive(PartialEq, Eq, Clone)]
+pub struct LWESwitchingKeyCompressed<D: Data>(pub(crate) GGLWESwitchingKeyCompressed<D>);
+
+impl<D: DataRef> fmt::Debug for LWESwitchingKeyCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self)
+    }
+}
+
+impl<D: DataMut> FillUniform for LWESwitchingKeyCompressed<D> {
+    fn fill_uniform(&mut self, source: &mut Source) {
+        self.0.fill_uniform(source);
+    }
+}
+
+impl<D: DataMut> Reset for LWESwitchingKeyCompressed<D> {
+    fn reset(&mut self) {
+        self.0.reset();
+    }
+}
+
+impl<D: DataRef> fmt::Display for LWESwitchingKeyCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "(LWESwitchingKeyCompressed) {}", self.0)
+    }
+}
+
+impl<D: Data> Infos for LWESwitchingKeyCompressed<D> {
+    type Inner = MatZnx<D>;
+
+    fn inner(&self) -> &Self::Inner {
+        self.0.inner()
+    }
+
+    fn basek(&self) -> usize {
+        self.0.basek()
+    }
+
+    fn k(&self) -> usize {
+        self.0.k()
+    }
+}
+
+impl<D: Data> LWESwitchingKeyCompressed<D> {
+    pub fn digits(&self) -> usize {
+        self.0.digits()
+    }
+
+    pub fn rank(&self) -> usize {
+        self.0.rank()
+    }
+
+    pub fn rank_in(&self) -> usize {
+        self.0.rank_in()
+    }
+
+    pub fn rank_out(&self) -> usize {
+        self.0.rank_out()
+    }
+}
+
+impl<D: DataMut> ReaderFrom for LWESwitchingKeyCompressed<D> {
+    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
+        self.0.read_from(reader)
+    }
+}
+
+impl<D: DataRef> WriterTo for LWESwitchingKeyCompressed<D> {
+    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
+        self.0.write_to(writer)
+    }
+}
+
+impl LWESwitchingKeyCompressed<Vec<u8>> {
+    pub fn alloc(n: usize, basek: usize, k: usize, rows: usize) -> Self {
+        Self(GGLWESwitchingKeyCompressed::alloc(
+            n, basek, k, rows, 1, 1, 1,
+        ))
+    }
+
+    pub fn encrypt_sk_scratch_space<B: Backend>(module: &Module<B>, n: usize, basek: usize, k: usize) -> usize
+    where
+        Module<B>: VecZnxDftAllocBytes
+            + VecZnxBigNormalize<B>
+            + VecZnxDftFromVecZnx<B>
+            + SvpApplyInplace<B>
+            + VecZnxDftToVecZnxBigConsume<B>
+            + VecZnxNormalizeTmpBytes
+            + VecZnxFillUniform
+            + VecZnxSubABInplace
+            + VecZnxAddInplace
+            + VecZnxNormalizeInplace<B>
+            + VecZnxAddNormal
+            + VecZnxNormalize<B>
+            + VecZnxSub
+            + SvpPrepare<B>
+            + SvpPPolAllocBytes
+            + SvpPPolAlloc<B>,
+    {
+        LWESwitchingKey::encrypt_sk_scratch_space(module, n, basek, k)
+    }
+}
+
+impl<D: DataMut, DR: DataRef, B: Backend> Decompress<B, LWESwitchingKeyCompressed<DR>> for LWESwitchingKey<D> {
+    fn decompress(&mut self, module: &Module<B>, other: &LWESwitchingKeyCompressed<DR>)
+    where
+        Module<B>: VecZnxCopy + VecZnxFillUniform,
+    {
+        self.0.decompress(module, &other.0);
+    }
+}

poulpy-core/src/layouts/compressed/lwe_to_glwe_ksk.rs

@@ -0,0 +1,128 @@
+use poulpy_backend::hal::{
+    api::{FillUniform, Reset},
+    api::{
+        SvpApplyInplace, SvpPPolAlloc, SvpPPolAllocBytes, SvpPrepare, VecZnxAddInplace, VecZnxAddNormal, VecZnxBigNormalize,
+        VecZnxCopy, VecZnxDftAllocBytes, VecZnxDftFromVecZnx, VecZnxDftToVecZnxBigConsume, VecZnxFillUniform, VecZnxNormalize,
+        VecZnxNormalizeInplace, VecZnxNormalizeTmpBytes, VecZnxSub, VecZnxSubABInplace,
+    },
+    layouts::{Backend, Data, DataMut, DataRef, MatZnx, Module, ReaderFrom, WriterTo},
+    source::Source,
+};
+
+use crate::layouts::{
+    Infos, LWEToGLWESwitchingKey,
+    compressed::{Decompress, GGLWESwitchingKeyCompressed},
+};
+use std::fmt;
+
+#[derive(PartialEq, Eq, Clone)]
+pub struct LWEToGLWESwitchingKeyCompressed<D: Data>(pub(crate) GGLWESwitchingKeyCompressed<D>);
+
+impl<D: DataRef> fmt::Debug for LWEToGLWESwitchingKeyCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self)
+    }
+}
+
+impl<D: DataMut> FillUniform for LWEToGLWESwitchingKeyCompressed<D> {
+    fn fill_uniform(&mut self, source: &mut Source) {
+        self.0.fill_uniform(source);
+    }
+}
+
+impl<D: DataMut> Reset for LWEToGLWESwitchingKeyCompressed<D> {
+    fn reset(&mut self) {
+        self.0.reset();
+    }
+}
+
+impl<D: DataRef> fmt::Display for LWEToGLWESwitchingKeyCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "(LWEToGLWESwitchingKeyCompressed) {}", self.0)
+    }
+}
+
+impl<D: Data> Infos for LWEToGLWESwitchingKeyCompressed<D> {
+    type Inner = MatZnx<D>;
+
+    fn inner(&self) -> &Self::Inner {
+        self.0.inner()
+    }
+
+    fn basek(&self) -> usize {
+        self.0.basek()
+    }
+
+    fn k(&self) -> usize {
+        self.0.k()
+    }
+}
+
+impl<D: Data> LWEToGLWESwitchingKeyCompressed<D> {
+    pub fn digits(&self) -> usize {
+        self.0.digits()
+    }
+
+    pub fn rank(&self) -> usize {
+        self.0.rank()
+    }
+
+    pub fn rank_in(&self) -> usize {
+        self.0.rank_in()
+    }
+
+    pub fn rank_out(&self) -> usize {
+        self.0.rank_out()
+    }
+}
+
+impl<D: DataMut> ReaderFrom for LWEToGLWESwitchingKeyCompressed<D> {
+    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
+        self.0.read_from(reader)
+    }
+}
+
+impl<D: DataRef> WriterTo for LWEToGLWESwitchingKeyCompressed<D> {
+    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
+        self.0.write_to(writer)
+    }
+}
+
+impl LWEToGLWESwitchingKeyCompressed<Vec<u8>> {
+    pub fn alloc(n: usize, basek: usize, k: usize, rows: usize, rank_out: usize) -> Self {
+        Self(GGLWESwitchingKeyCompressed::alloc(
+            n, basek, k, rows, 1, 1, rank_out,
+        ))
+    }
+
+    pub fn encrypt_sk_scratch_space<B: Backend>(module: &Module<B>, n: usize, basek: usize, k: usize, rank_out: usize) -> usize
+    where
+        Module<B>: VecZnxDftAllocBytes
+            + VecZnxBigNormalize<B>
+            + VecZnxDftFromVecZnx<B>
+            + SvpApplyInplace<B>
+            + VecZnxDftToVecZnxBigConsume<B>
+            + VecZnxNormalizeTmpBytes
+            + VecZnxFillUniform
+            + VecZnxSubABInplace
+            + VecZnxAddInplace
+            + VecZnxNormalizeInplace<B>
+            + VecZnxAddNormal
+            + VecZnxNormalize<B>
+            + VecZnxSub
+            + SvpPrepare<B>
+            + SvpPPolAllocBytes
+            + SvpPPolAlloc<B>,
+    {
+        LWEToGLWESwitchingKey::encrypt_sk_scratch_space(module, n, basek, k, rank_out)
+    }
+}
+
+impl<D: DataMut, DR: DataRef, B: Backend> Decompress<B, LWEToGLWESwitchingKeyCompressed<DR>> for LWEToGLWESwitchingKey<D> {
+    fn decompress(&mut self, module: &Module<B>, other: &LWEToGLWESwitchingKeyCompressed<DR>)
+    where
+        Module<B>: VecZnxCopy + VecZnxFillUniform,
+    {
+        self.0.decompress(module, &other.0);
+    }
+}

poulpy-core/src/layouts/compressed/mod.rs

@@ -0,0 +1,32 @@
+mod gglwe_atk;
+mod gglwe_ct;
+mod gglwe_ksk;
+mod gglwe_tsk;
+mod ggsw_ct;
+mod glwe_ct;
+mod glwe_to_lwe_ksk;
+mod lwe_ct;
+mod lwe_ksk;
+mod lwe_to_glwe_ksk;
+
+pub use gglwe_atk::*;
+pub use gglwe_ct::*;
+pub use gglwe_ksk::*;
+pub use gglwe_tsk::*;
+pub use ggsw_ct::*;
+pub use glwe_ct::*;
+pub use glwe_to_lwe_ksk::*;
+pub use lwe_ct::*;
+pub use lwe_ksk::*;
+pub use lwe_to_glwe_ksk::*;
+
+use poulpy_backend::hal::{
+    api::{VecZnxCopy, VecZnxFillUniform},
+    layouts::{Backend, Module},
+};
+
+pub trait Decompress<B: Backend, C> {
+    fn decompress(&mut self, module: &Module<B>, other: &C)
+    where
+        Module<B>: VecZnxFillUniform + VecZnxCopy;
+}

poulpy-core/src/layouts/gglwe_atk.rs

@@ -0,0 +1,121 @@
+use poulpy_backend::hal::{
+    api::{FillUniform, Reset},
+    layouts::{Data, DataMut, DataRef, MatZnx, ReaderFrom, WriterTo},
+    source::Source,
+};
+
+use crate::layouts::{GGLWESwitchingKey, GLWECiphertext, Infos};
+use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
+
+use std::fmt;
+
+#[derive(PartialEq, Eq, Clone)]
+pub struct GGLWEAutomorphismKey<D: Data> {
+    pub(crate) key: GGLWESwitchingKey<D>,
+    pub(crate) p: i64,
+}
+
+impl<D: DataRef> fmt::Debug for GGLWEAutomorphismKey<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self)
+    }
+}
+
+impl<D: DataMut> FillUniform for GGLWEAutomorphismKey<D> {
+    fn fill_uniform(&mut self, source: &mut Source) {
+        self.key.fill_uniform(source);
+    }
+}
+
+impl<D: DataMut> Reset for GGLWEAutomorphismKey<D>
+where
+    MatZnx<D>: Reset,
+{
+    fn reset(&mut self) {
+        self.key.reset();
+        self.p = 0;
+    }
+}
+
+impl<D: DataRef> fmt::Display for GGLWEAutomorphismKey<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "(AutomorphismKey: p={}) {}", self.p, self.key)
+    }
+}
+
+impl GGLWEAutomorphismKey<Vec<u8>> {
+    pub fn alloc(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> Self {
+        GGLWEAutomorphismKey {
+            key: GGLWESwitchingKey::alloc(n, basek, k, rows, digits, rank, rank),
+            p: 0,
+        }
+    }
+
+    pub fn bytes_of(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> usize {
+        GGLWESwitchingKey::bytes_of(n, basek, k, rows, digits, rank, rank)
+    }
+}
+
+impl<D: Data> Infos for GGLWEAutomorphismKey<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> GGLWEAutomorphismKey<D> {
+    pub fn p(&self) -> i64 {
+        self.p
+    }
+
+    pub fn digits(&self) -> usize {
+        self.key.digits()
+    }
+
+    pub fn rank(&self) -> usize {
+        self.key.rank()
+    }
+
+    pub fn rank_in(&self) -> usize {
+        self.key.rank_in()
+    }
+
+    pub fn rank_out(&self) -> usize {
+        self.key.rank_out()
+    }
+}
+
+impl<D: DataRef> GGLWEAutomorphismKey<D> {
+    pub fn at(&self, row: usize, col: usize) -> GLWECiphertext<&[u8]> {
+        self.key.at(row, col)
+    }
+}
+
+impl<D: DataMut> GGLWEAutomorphismKey<D> {
+    pub fn at_mut(&mut self, row: usize, col: usize) -> GLWECiphertext<&mut [u8]> {
+        self.key.at_mut(row, col)
+    }
+}
+
+impl<D: DataMut> ReaderFrom for GGLWEAutomorphismKey<D> {
+    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
+        self.p = reader.read_u64::<LittleEndian>()? as i64;
+        self.key.read_from(reader)
+    }
+}
+
+impl<D: DataRef> WriterTo for GGLWEAutomorphismKey<D> {
+    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
+        writer.write_u64::<LittleEndian>(self.p as u64)?;
+        self.key.write_to(writer)
+    }
+}

poulpy-core/src/layouts/gglwe_ct.rs

@@ -0,0 +1,168 @@
+use poulpy_backend::hal::{
+    api::{FillUniform, Reset},
+    layouts::{Data, DataMut, DataRef, MatZnx, ReaderFrom, WriterTo},
+    source::Source,
+};
+
+use crate::layouts::{GLWECiphertext, Infos};
+use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
+
+use std::fmt;
+
+#[derive(PartialEq, Eq, Clone)]
+pub struct GGLWECiphertext<D: Data> {
+    pub(crate) data: MatZnx<D>,
+    pub(crate) basek: usize,
+    pub(crate) k: usize,
+    pub(crate) digits: usize,
+}
+
+impl<D: DataRef> fmt::Debug for GGLWECiphertext<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self)
+    }
+}
+
+impl<D: DataMut> FillUniform for GGLWECiphertext<D> {
+    fn fill_uniform(&mut self, source: &mut Source) {
+        self.data.fill_uniform(source);
+    }
+}
+
+impl<D: DataMut> Reset for GGLWECiphertext<D> {
+    fn reset(&mut self) {
+        self.data.reset();
+        self.basek = 0;
+        self.k = 0;
+        self.digits = 0;
+    }
+}
+
+impl<D: DataRef> fmt::Display for GGLWECiphertext<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "(GGLWECiphertext: basek={} k={} digits={}) {}",
+            self.basek, self.k, self.digits, self.data
+        )
+    }
+}
+
+impl<D: DataRef> GGLWECiphertext<D> {
+    pub fn at(&self, row: usize, col: usize) -> GLWECiphertext<&[u8]> {
+        GLWECiphertext {
+            data: self.data.at(row, col),
+            basek: self.basek,
+            k: self.k,
+        }
+    }
+}
+
+impl<D: DataMut> GGLWECiphertext<D> {
+    pub fn at_mut(&mut self, row: usize, col: usize) -> GLWECiphertext<&mut [u8]> {
+        GLWECiphertext {
+            data: self.data.at_mut(row, col),
+            basek: self.basek,
+            k: self.k,
+        }
+    }
+}
+
+impl GGLWECiphertext<Vec<u8>> {
+    pub fn alloc(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank_in: usize, rank_out: usize) -> Self {
+        let size: usize = k.div_ceil(basek);
+        debug_assert!(
+            size > digits,
+            "invalid gglwe: ceil(k/basek): {} <= digits: {}",
+            size,
+            digits
+        );
+
+        assert!(
+            rows * digits <= size,
+            "invalid gglwe: rows: {} * digits:{} > ceil(k/basek): {}",
+            rows,
+            digits,
+            size
+        );
+
+        Self {
+            data: MatZnx::alloc(n, rows, rank_in, rank_out + 1, size),
+            basek,
+            k,
+            digits,
+        }
+    }
+
+    pub fn bytes_of(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank_in: usize, rank_out: usize) -> usize {
+        let size: usize = k.div_ceil(basek);
+        debug_assert!(
+            size > digits,
+            "invalid gglwe: ceil(k/basek): {} <= digits: {}",
+            size,
+            digits
+        );
+
+        assert!(
+            rows * digits <= size,
+            "invalid gglwe: rows: {} * digits:{} > ceil(k/basek): {}",
+            rows,
+            digits,
+            size
+        );
+
+        MatZnx::alloc_bytes(n, rows, rank_in, rank_out + 1, rows)
+    }
+}
+
+impl<D: Data> Infos for GGLWECiphertext<D> {
+    type Inner = MatZnx<D>;
+
+    fn inner(&self) -> &Self::Inner {
+        &self.data
+    }
+
+    fn basek(&self) -> usize {
+        self.basek
+    }
+
+    fn k(&self) -> usize {
+        self.k
+    }
+}
+
+impl<D: Data> GGLWECiphertext<D> {
+    pub fn rank(&self) -> usize {
+        self.data.cols_out() - 1
+    }
+
+    pub fn digits(&self) -> usize {
+        self.digits
+    }
+
+    pub fn rank_in(&self) -> usize {
+        self.data.cols_in()
+    }
+
+    pub fn rank_out(&self) -> usize {
+        self.data.cols_out() - 1
+    }
+}
+
+impl<D: DataMut> ReaderFrom for GGLWECiphertext<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.digits = reader.read_u64::<LittleEndian>()? as usize;
+        self.data.read_from(reader)
+    }
+}
+
+impl<D: DataRef> WriterTo for GGLWECiphertext<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.digits as u64)?;
+        self.data.write_to(writer)
+    }
+}

poulpy-core/src/layouts/gglwe_ksk.rs

@@ -0,0 +1,134 @@
+use poulpy_backend::hal::{
+    api::{FillUniform, Reset},
+    layouts::{Data, DataMut, DataRef, MatZnx, ReaderFrom, WriterTo},
+    source::Source,
+};
+
+use crate::layouts::{GGLWECiphertext, GLWECiphertext, Infos};
+use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
+
+use std::fmt;
+
+#[derive(PartialEq, Eq, Clone)]
+pub struct GGLWESwitchingKey<D: Data> {
+    pub(crate) key: GGLWECiphertext<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 GGLWESwitchingKey<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self)
+    }
+}
+
+impl<D: DataRef> fmt::Display for GGLWESwitchingKey<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "(GLWESwitchingKey: sk_in_n={} sk_out_n={}) {}",
+            self.sk_in_n, self.sk_out_n, self.key.data
+        )
+    }
+}
+
+impl<D: DataMut> FillUniform for GGLWESwitchingKey<D> {
+    fn fill_uniform(&mut self, source: &mut Source) {
+        self.key.fill_uniform(source);
+    }
+}
+
+impl<D: DataMut> Reset for GGLWESwitchingKey<D>
+where
+    MatZnx<D>: Reset,
+{
+    fn reset(&mut self) {
+        self.key.reset();
+        self.sk_in_n = 0;
+        self.sk_out_n = 0;
+    }
+}
+
+impl GGLWESwitchingKey<Vec<u8>> {
+    pub fn alloc(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank_in: usize, rank_out: usize) -> Self {
+        GGLWESwitchingKey {
+            key: GGLWECiphertext::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, rank_out: usize) -> usize {
+        GGLWECiphertext::<Vec<u8>>::bytes_of(n, basek, k, rows, digits, rank_in, rank_out)
+    }
+}
+
+impl<D: Data> Infos for GGLWESwitchingKey<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> GGLWESwitchingKey<D> {
+    pub fn rank(&self) -> usize {
+        self.key.data.cols_out() - 1
+    }
+
+    pub fn rank_in(&self) -> usize {
+        self.key.data.cols_in()
+    }
+
+    pub fn rank_out(&self) -> usize {
+        self.key.data.cols_out() - 1
+    }
+
+    pub fn digits(&self) -> usize {
+        self.key.digits()
+    }
+
+    pub fn sk_degree_in(&self) -> usize {
+        self.sk_in_n
+    }
+
+    pub fn sk_degree_out(&self) -> usize {
+        self.sk_out_n
+    }
+}
+
+impl<D: DataRef> GGLWESwitchingKey<D> {
+    pub fn at(&self, row: usize, col: usize) -> GLWECiphertext<&[u8]> {
+        self.key.at(row, col)
+    }
+}
+
+impl<D: DataMut> GGLWESwitchingKey<D> {
+    pub fn at_mut(&mut self, row: usize, col: usize) -> GLWECiphertext<&mut [u8]> {
+        self.key.at_mut(row, col)
+    }
+}
+
+impl<D: DataMut> ReaderFrom for GGLWESwitchingKey<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 GGLWESwitchingKey<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)
+    }
+}

poulpy-core/src/layouts/gglwe_tsk.rs

@@ -0,0 +1,148 @@
+use poulpy_backend::hal::{
+    api::{FillUniform, Reset},
+    layouts::{Data, DataMut, DataRef, MatZnx, ReaderFrom, WriterTo},
+    source::Source,
+};
+
+use crate::layouts::{GGLWESwitchingKey, Infos};
+use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
+
+use std::fmt;
+
+#[derive(PartialEq, Eq, Clone)]
+pub struct GGLWETensorKey<D: Data> {
+    pub(crate) keys: Vec<GGLWESwitchingKey<D>>,
+}
+
+impl<D: DataRef> fmt::Debug for GGLWETensorKey<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self)
+    }
+}
+
+impl<D: DataMut> FillUniform for GGLWETensorKey<D> {
+    fn fill_uniform(&mut self, source: &mut Source) {
+        self.keys
+            .iter_mut()
+            .for_each(|key: &mut GGLWESwitchingKey<D>| key.fill_uniform(source))
+    }
+}
+
+impl<D: DataMut> Reset for GGLWETensorKey<D>
+where
+    MatZnx<D>: Reset,
+{
+    fn reset(&mut self) {
+        self.keys
+            .iter_mut()
+            .for_each(|key: &mut GGLWESwitchingKey<D>| key.reset())
+    }
+}
+
+impl<D: DataRef> fmt::Display for GGLWETensorKey<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        writeln!(f, "(GLWETensorKey)",)?;
+        for (i, key) in self.keys.iter().enumerate() {
+            write!(f, "{}: {}", i, key)?;
+        }
+        Ok(())
+    }
+}
+
+impl GGLWETensorKey<Vec<u8>> {
+    pub fn alloc(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> Self {
+        let mut keys: Vec<GGLWESwitchingKey<Vec<u8>>> = Vec::new();
+        let pairs: usize = (((rank + 1) * rank) >> 1).max(1);
+        (0..pairs).for_each(|_| {
+            keys.push(GGLWESwitchingKey::alloc(n, basek, k, rows, digits, 1, rank));
+        });
+        Self { keys }
+    }
+
+    pub fn bytes_of(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> usize {
+        let pairs: usize = (((rank + 1) * rank) >> 1).max(1);
+        pairs * GGLWESwitchingKey::<Vec<u8>>::bytes_of(n, basek, k, rows, digits, 1, rank)
+    }
+}
+
+impl<D: Data> Infos for GGLWETensorKey<D> {
+    type Inner = MatZnx<D>;
+
+    fn inner(&self) -> &Self::Inner {
+        self.keys[0].inner()
+    }
+
+    fn basek(&self) -> usize {
+        self.keys[0].basek()
+    }
+
+    fn k(&self) -> usize {
+        self.keys[0].k()
+    }
+}
+
+impl<D: Data> GGLWETensorKey<D> {
+    pub fn rank(&self) -> usize {
+        self.keys[0].rank()
+    }
+
+    pub fn rank_in(&self) -> usize {
+        self.keys[0].rank_in()
+    }
+
+    pub fn rank_out(&self) -> usize {
+        self.keys[0].rank_out()
+    }
+
+    pub fn digits(&self) -> usize {
+        self.keys[0].digits()
+    }
+}
+
+impl<D: DataMut> GGLWETensorKey<D> {
+    // Returns a mutable reference to GLWESwitchingKey_{s}(s[i] * s[j])
+    pub fn at_mut(&mut self, mut i: usize, mut j: usize) -> &mut GGLWESwitchingKey<D> {
+        if i > j {
+            std::mem::swap(&mut i, &mut j);
+        };
+        let rank: usize = self.rank();
+        &mut self.keys[i * rank + j - (i * (i + 1) / 2)]
+    }
+}
+
+impl<D: DataRef> GGLWETensorKey<D> {
+    // Returns a reference to GLWESwitchingKey_{s}(s[i] * s[j])
+    pub fn at(&self, mut i: usize, mut j: usize) -> &GGLWESwitchingKey<D> {
+        if i > j {
+            std::mem::swap(&mut i, &mut j);
+        };
+        let rank: usize = self.rank();
+        &self.keys[i * rank + j - (i * (i + 1) / 2)]
+    }
+}
+
+impl<D: DataMut> ReaderFrom for GGLWETensorKey<D> {
+    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
+        let len: usize = reader.read_u64::<LittleEndian>()? as usize;
+        if self.keys.len() != len {
+            return Err(std::io::Error::new(
+                std::io::ErrorKind::InvalidData,
+                format!("self.keys.len()={} != read len={}", self.keys.len(), len),
+            ));
+        }
+        for key in &mut self.keys {
+            key.read_from(reader)?;
+        }
+        Ok(())
+    }
+}
+
+impl<D: DataRef> WriterTo for GGLWETensorKey<D> {
+    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
+        writer.write_u64::<LittleEndian>(self.keys.len() as u64)?;
+        for key in &self.keys {
+            key.write_to(writer)?;
+        }
+        Ok(())
+    }
+}

poulpy-core/src/layouts/ggsw_ct.rs

@@ -0,0 +1,162 @@
+use poulpy_backend::hal::{
+    api::{FillUniform, Reset},
+    layouts::{Data, DataMut, DataRef, MatZnx, ReaderFrom, WriterTo},
+    source::Source,
+};
+use std::fmt;
+
+use crate::layouts::{GLWECiphertext, Infos};
+
+#[derive(PartialEq, Eq, Clone)]
+pub struct GGSWCiphertext<D: Data> {
+    pub(crate) data: MatZnx<D>,
+    pub(crate) basek: usize,
+    pub(crate) k: usize,
+    pub(crate) digits: usize,
+}
+
+impl<D: DataRef> fmt::Debug for GGSWCiphertext<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self.data)
+    }
+}
+
+impl<D: DataRef> fmt::Display for GGSWCiphertext<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "(GGSWCiphertext: basek={} k={} digits={}) {}",
+            self.basek, self.k, self.digits, self.data
+        )
+    }
+}
+
+impl<D: DataMut> Reset for GGSWCiphertext<D> {
+    fn reset(&mut self) {
+        self.data.reset();
+        self.basek = 0;
+        self.k = 0;
+        self.digits = 0;
+    }
+}
+
+impl<D: DataMut> FillUniform for GGSWCiphertext<D> {
+    fn fill_uniform(&mut self, source: &mut Source) {
+        self.data.fill_uniform(source);
+    }
+}
+
+impl<D: DataRef> GGSWCiphertext<D> {
+    pub fn at(&self, row: usize, col: usize) -> GLWECiphertext<&[u8]> {
+        GLWECiphertext {
+            data: self.data.at(row, col),
+            basek: self.basek,
+            k: self.k,
+        }
+    }
+}
+
+impl<D: DataMut> GGSWCiphertext<D> {
+    pub fn at_mut(&mut self, row: usize, col: usize) -> GLWECiphertext<&mut [u8]> {
+        GLWECiphertext {
+            data: self.data.at_mut(row, col),
+            basek: self.basek,
+            k: self.k,
+        }
+    }
+}
+
+impl GGSWCiphertext<Vec<u8>> {
+    pub fn alloc(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> Self {
+        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: MatZnx::alloc(n, rows, rank + 1, rank + 1, k.div_ceil(basek)),
+            basek,
+            k,
+            digits,
+        }
+    }
+
+    pub fn bytes_of(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> usize {
+        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
+        );
+
+        MatZnx::alloc_bytes(n, rows, rank + 1, rank + 1, size)
+    }
+}
+
+impl<D: Data> Infos for GGSWCiphertext<D> {
+    type Inner = MatZnx<D>;
+
+    fn inner(&self) -> &Self::Inner {
+        &self.data
+    }
+
+    fn basek(&self) -> usize {
+        self.basek
+    }
+
+    fn k(&self) -> usize {
+        self.k
+    }
+}
+
+impl<D: Data> GGSWCiphertext<D> {
+    pub fn rank(&self) -> usize {
+        self.data.cols_out() - 1
+    }
+
+    pub fn digits(&self) -> usize {
+        self.digits
+    }
+}
+
+use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
+
+impl<D: DataMut> ReaderFrom for GGSWCiphertext<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.digits = reader.read_u64::<LittleEndian>()? as usize;
+        self.data.read_from(reader)
+    }
+}
+
+impl<D: DataRef> WriterTo for GGSWCiphertext<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.digits as u64)?;
+        self.data.write_to(writer)
+    }
+}

poulpy-core/src/layouts/glwe_ct.rs

@@ -0,0 +1,152 @@
+use poulpy_backend::hal::{
+    api::{FillUniform, Reset},
+    layouts::{Data, DataMut, DataRef, ReaderFrom, ToOwnedDeep, VecZnx, VecZnxToMut, VecZnxToRef, WriterTo},
+    source::Source,
+};
+
+use crate::layouts::{Infos, SetMetaData};
+use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
+use std::fmt;
+
+#[derive(PartialEq, Eq, Clone)]
+pub struct GLWECiphertext<D: Data> {
+    pub data: VecZnx<D>,
+    pub basek: usize,
+    pub k: usize,
+}
+
+impl<D: DataRef> ToOwnedDeep for GLWECiphertext<D> {
+    type Owned = GLWECiphertext<Vec<u8>>;
+    fn to_owned_deep(&self) -> Self::Owned {
+        GLWECiphertext {
+            data: self.data.to_owned_deep(),
+            basek: self.basek,
+            k: self.k,
+        }
+    }
+}
+
+impl<D: DataRef> fmt::Debug for GLWECiphertext<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self)
+    }
+}
+
+impl<D: DataRef> fmt::Display for GLWECiphertext<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "GLWECiphertext: basek={} k={}: {}",
+            self.basek(),
+            self.k(),
+            self.data
+        )
+    }
+}
+
+impl<D: DataMut> Reset for GLWECiphertext<D>
+where
+    VecZnx<D>: Reset,
+{
+    fn reset(&mut self) {
+        self.data.reset();
+        self.basek = 0;
+        self.k = 0;
+    }
+}
+
+impl<D: DataMut> FillUniform for GLWECiphertext<D> {
+    fn fill_uniform(&mut self, source: &mut Source) {
+        self.data.fill_uniform(source);
+    }
+}
+
+impl GLWECiphertext<Vec<u8>> {
+    pub fn alloc(n: usize, basek: usize, k: usize, rank: usize) -> Self {
+        Self {
+            data: VecZnx::alloc(n, rank + 1, k.div_ceil(basek)),
+            basek,
+            k,
+        }
+    }
+
+    pub fn bytes_of(n: usize, basek: usize, k: usize, rank: usize) -> usize {
+        VecZnx::alloc_bytes(n, rank + 1, k.div_ceil(basek))
+    }
+}
+
+impl<D: Data> Infos for GLWECiphertext<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> GLWECiphertext<D> {
+    pub fn rank(&self) -> usize {
+        self.cols() - 1
+    }
+}
+
+impl<D: DataMut> SetMetaData for GLWECiphertext<D> {
+    fn set_k(&mut self, k: usize) {
+        self.k = k
+    }
+
+    fn set_basek(&mut self, basek: usize) {
+        self.basek = basek
+    }
+}
+
+pub trait GLWECiphertextToRef: Infos {
+    fn to_ref(&self) -> GLWECiphertext<&[u8]>;
+}
+
+impl<D: DataRef> GLWECiphertextToRef for GLWECiphertext<D> {
+    fn to_ref(&self) -> GLWECiphertext<&[u8]> {
+        GLWECiphertext {
+            data: self.data.to_ref(),
+            basek: self.basek,
+            k: self.k,
+        }
+    }
+}
+
+pub trait GLWECiphertextToMut: Infos {
+    fn to_mut(&mut self) -> GLWECiphertext<&mut [u8]>;
+}
+
+impl<D: DataMut> GLWECiphertextToMut for GLWECiphertext<D> {
+    fn to_mut(&mut self) -> GLWECiphertext<&mut [u8]> {
+        GLWECiphertext {
+            data: self.data.to_mut(),
+            basek: self.basek,
+            k: self.k,
+        }
+    }
+}
+
+impl<D: DataMut> ReaderFrom for GLWECiphertext<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.data.read_from(reader)
+    }
+}
+
+impl<D: DataRef> WriterTo for GLWECiphertext<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)?;
+        self.data.write_to(writer)
+    }
+}

poulpy-core/src/layouts/glwe_pk.rs

@@ -0,0 +1,73 @@
+use poulpy_backend::hal::layouts::{Data, DataMut, DataRef, ReaderFrom, VecZnx, WriterTo};
+
+use crate::{dist::Distribution, layouts::Infos};
+use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
+
+#[derive(PartialEq, Eq)]
+pub struct GLWEPublicKey<D: Data> {
+    pub(crate) data: VecZnx<D>,
+    pub(crate) basek: usize,
+    pub(crate) k: usize,
+    pub(crate) dist: Distribution,
+}
+
+impl GLWEPublicKey<Vec<u8>> {
+    pub fn alloc(n: usize, basek: usize, k: usize, rank: usize) -> Self {
+        Self {
+            data: VecZnx::alloc(n, rank + 1, k.div_ceil(basek)),
+            basek,
+            k,
+            dist: Distribution::NONE,
+        }
+    }
+
+    pub fn bytes_of(n: usize, basek: usize, k: usize, rank: usize) -> usize {
+        VecZnx::alloc_bytes(n, rank + 1, k.div_ceil(basek))
+    }
+}
+
+impl<D: Data> Infos for GLWEPublicKey<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> GLWEPublicKey<D> {
+    pub fn rank(&self) -> usize {
+        self.cols() - 1
+    }
+}
+
+impl<D: DataMut> ReaderFrom for GLWEPublicKey<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;
+        match Distribution::read_from(reader) {
+            Ok(dist) => self.dist = dist,
+            Err(e) => return Err(e),
+        }
+        self.data.read_from(reader)
+    }
+}
+
+impl<D: DataRef> WriterTo for GLWEPublicKey<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)?;
+        match self.dist.write_to(writer) {
+            Ok(()) => {}
+            Err(e) => return Err(e),
+        }
+        self.data.write_to(writer)
+    }
+}

poulpy-core/src/layouts/glwe_pt.rs

@@ -0,0 +1,83 @@
+use std::fmt;
+
+use poulpy_backend::hal::layouts::{Data, DataMut, DataRef, VecZnx, VecZnxToMut, VecZnxToRef};
+
+use crate::layouts::{GLWECiphertext, GLWECiphertextToMut, GLWECiphertextToRef, Infos, SetMetaData};
+
+pub struct GLWEPlaintext<D: Data> {
+    pub data: VecZnx<D>,
+    pub basek: usize,
+    pub k: usize,
+}
+
+impl<D: DataRef> fmt::Display for GLWEPlaintext<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "GLWEPlaintext: basek={} k={}: {}",
+            self.basek(),
+            self.k(),
+            self.data
+        )
+    }
+}
+
+impl<D: Data> Infos for GLWEPlaintext<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: DataMut> SetMetaData for GLWEPlaintext<D> {
+    fn set_k(&mut self, k: usize) {
+        self.k = k
+    }
+
+    fn set_basek(&mut self, basek: usize) {
+        self.basek = basek
+    }
+}
+
+impl GLWEPlaintext<Vec<u8>> {
+    pub fn alloc(n: usize, basek: usize, k: usize) -> Self {
+        Self {
+            data: VecZnx::alloc(n, 1, k.div_ceil(basek)),
+            basek,
+            k,
+        }
+    }
+
+    pub fn byte_of(n: usize, basek: usize, k: usize) -> usize {
+        VecZnx::alloc_bytes(n, 1, k.div_ceil(basek))
+    }
+}
+
+impl<D: DataRef> GLWECiphertextToRef for GLWEPlaintext<D> {
+    fn to_ref(&self) -> GLWECiphertext<&[u8]> {
+        GLWECiphertext {
+            data: self.data.to_ref(),
+            basek: self.basek,
+            k: self.k,
+        }
+    }
+}
+
+impl<D: DataMut> GLWECiphertextToMut for GLWEPlaintext<D> {
+    fn to_mut(&mut self) -> GLWECiphertext<&mut [u8]> {
+        GLWECiphertext {
+            data: self.data.to_mut(),
+            basek: self.basek,
+            k: self.k,
+        }
+    }
+}

poulpy-core/src/layouts/glwe_sk.rs

@@ -0,0 +1,102 @@
+use poulpy_backend::hal::{
+    api::{ZnxInfos, ZnxZero},
+    layouts::{Data, DataMut, DataRef, ReaderFrom, ScalarZnx, WriterTo},
+    source::Source,
+};
+
+use crate::dist::Distribution;
+
+#[derive(PartialEq, Eq, Clone)]
+pub struct GLWESecret<D: Data> {
+    pub(crate) data: ScalarZnx<D>,
+    pub(crate) dist: Distribution,
+}
+
+impl GLWESecret<Vec<u8>> {
+    pub fn alloc(n: usize, rank: usize) -> Self {
+        Self {
+            data: ScalarZnx::alloc(n, rank),
+            dist: Distribution::NONE,
+        }
+    }
+
+    pub fn bytes_of(n: usize, rank: usize) -> usize {
+        ScalarZnx::alloc_bytes(n, rank)
+    }
+}
+
+impl<D: Data> GLWESecret<D> {
+    pub fn n(&self) -> usize {
+        self.data.n()
+    }
+
+    pub fn log_n(&self) -> usize {
+        self.data.log_n()
+    }
+
+    pub fn rank(&self) -> usize {
+        self.data.cols()
+    }
+}
+
+impl<D: DataMut> GLWESecret<D> {
+    pub fn fill_ternary_prob(&mut self, prob: f64, source: &mut Source) {
+        (0..self.rank()).for_each(|i| {
+            self.data.fill_ternary_prob(i, prob, source);
+        });
+        self.dist = Distribution::TernaryProb(prob);
+    }
+
+    pub fn fill_ternary_hw(&mut self, hw: usize, source: &mut Source) {
+        (0..self.rank()).for_each(|i| {
+            self.data.fill_ternary_hw(i, hw, source);
+        });
+        self.dist = Distribution::TernaryFixed(hw);
+    }
+
+    pub fn fill_binary_prob(&mut self, prob: f64, source: &mut Source) {
+        (0..self.rank()).for_each(|i| {
+            self.data.fill_binary_prob(i, prob, source);
+        });
+        self.dist = Distribution::BinaryProb(prob);
+    }
+
+    pub fn fill_binary_hw(&mut self, hw: usize, source: &mut Source) {
+        (0..self.rank()).for_each(|i| {
+            self.data.fill_binary_hw(i, hw, source);
+        });
+        self.dist = Distribution::BinaryFixed(hw);
+    }
+
+    pub fn fill_binary_block(&mut self, block_size: usize, source: &mut Source) {
+        (0..self.rank()).for_each(|i| {
+            self.data.fill_binary_block(i, block_size, source);
+        });
+        self.dist = Distribution::BinaryBlock(block_size);
+    }
+
+    pub fn fill_zero(&mut self) {
+        self.data.zero();
+        self.dist = Distribution::ZERO;
+    }
+}
+
+impl<D: DataMut> ReaderFrom for GLWESecret<D> {
+    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
+        match Distribution::read_from(reader) {
+            Ok(dist) => self.dist = dist,
+            Err(e) => return Err(e),
+        }
+        self.data.read_from(reader)
+    }
+}
+
+impl<D: DataRef> WriterTo for GLWESecret<D> {
+    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
+        match self.dist.write_to(writer) {
+            Ok(()) => {}
+            Err(e) => return Err(e),
+        }
+        self.data.write_to(writer)
+    }
+}

poulpy-core/src/layouts/glwe_to_lwe_ksk.rs

@@ -0,0 +1,89 @@
+use poulpy_backend::hal::{
+    api::{FillUniform, Reset},
+    layouts::{Data, DataMut, DataRef, MatZnx, ReaderFrom, WriterTo},
+    source::Source,
+};
+
+use crate::layouts::{GGLWESwitchingKey, Infos};
+
+use std::fmt;
+
+/// A special [GLWESwitchingKey] required to for the conversion from [GLWECiphertext] to [LWECiphertext].
+#[derive(PartialEq, Eq, Clone)]
+pub struct GLWEToLWESwitchingKey<D: Data>(pub(crate) GGLWESwitchingKey<D>);
+
+impl<D: DataRef> fmt::Debug for GLWEToLWESwitchingKey<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self)
+    }
+}
+
+impl<D: DataMut> FillUniform for GLWEToLWESwitchingKey<D> {
+    fn fill_uniform(&mut self, source: &mut Source) {
+        self.0.fill_uniform(source);
+    }
+}
+
+impl<D: DataMut> Reset for GLWEToLWESwitchingKey<D> {
+    fn reset(&mut self) {
+        self.0.reset();
+    }
+}
+
+impl<D: DataRef> fmt::Display for GLWEToLWESwitchingKey<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "(GLWEToLWESwitchingKey) {}", self.0)
+    }
+}
+
+impl<D: Data> Infos for GLWEToLWESwitchingKey<D> {
+    type Inner = MatZnx<D>;
+
+    fn inner(&self) -> &Self::Inner {
+        self.0.inner()
+    }
+
+    fn basek(&self) -> usize {
+        self.0.basek()
+    }
+
+    fn k(&self) -> usize {
+        self.0.k()
+    }
+}
+
+impl<D: Data> GLWEToLWESwitchingKey<D> {
+    pub fn digits(&self) -> usize {
+        self.0.digits()
+    }
+
+    pub fn rank(&self) -> usize {
+        self.0.rank()
+    }
+
+    pub fn rank_in(&self) -> usize {
+        self.0.rank_in()
+    }
+
+    pub fn rank_out(&self) -> usize {
+        self.0.rank_out()
+    }
+}
+
+impl<D: DataMut> ReaderFrom for GLWEToLWESwitchingKey<D> {
+    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
+        self.0.read_from(reader)
+    }
+}
+
+impl<D: DataRef> WriterTo for GLWEToLWESwitchingKey<D> {
+    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
+        self.0.write_to(writer)
+    }
+}
+
+impl GLWEToLWESwitchingKey<Vec<u8>> {
+    pub fn alloc(n: usize, basek: usize, k: usize, rows: usize, rank_in: usize) -> Self {
+        Self(GGLWESwitchingKey::alloc(n, basek, k, rows, 1, rank_in, 1))
+    }
+}

poulpy-core/src/layouts/infos.rs

@@ -0,0 +1,54 @@
+use poulpy_backend::hal::api::ZnxInfos;
+
+pub trait Infos {
+    type Inner: ZnxInfos;
+
+    fn inner(&self) -> &Self::Inner;
+
+    /// Returns the ring degree of the polynomials.
+    fn n(&self) -> usize {
+        self.inner().n()
+    }
+
+    /// Returns the base two logarithm of the ring dimension of the polynomials.
+    fn log_n(&self) -> usize {
+        self.inner().log_n()
+    }
+
+    /// Returns the number of rows.
+    fn rows(&self) -> usize {
+        self.inner().rows()
+    }
+
+    /// Returns the number of polynomials in each row.
+    fn cols(&self) -> usize {
+        self.inner().cols()
+    }
+
+    fn rank(&self) -> usize {
+        self.cols() - 1
+    }
+
+    /// Returns the number of size per polynomial.
+    fn size(&self) -> usize {
+        let size: usize = self.inner().size();
+        debug_assert!(size >= self.k().div_ceil(self.basek()));
+        size
+    }
+
+    /// Returns the total number of small polynomials.
+    fn poly_count(&self) -> usize {
+        self.rows() * self.cols() * self.size()
+    }
+
+    /// Returns the base 2 logarithm of the ciphertext base.
+    fn basek(&self) -> usize;
+
+    /// Returns the bit precision of the ciphertext.
+    fn k(&self) -> usize;
+}
+
+pub trait SetMetaData {
+    fn set_basek(&mut self, basek: usize);
+    fn set_k(&mut self, k: usize);
+}

poulpy-core/src/layouts/lwe_ct.rs

@@ -0,0 +1,153 @@
+use std::fmt;
+
+use poulpy_backend::hal::{
+    api::{FillUniform, Reset, ZnxInfos},
+    layouts::{Data, DataMut, DataRef, ReaderFrom, VecZnx, VecZnxToMut, VecZnxToRef, WriterTo},
+    source::Source,
+};
+
+#[derive(PartialEq, Eq, Clone)]
+pub struct LWECiphertext<D: Data> {
+    pub(crate) data: VecZnx<D>,
+    pub(crate) k: usize,
+    pub(crate) basek: usize,
+}
+
+impl<D: DataRef> LWECiphertext<D> {
+    pub fn data(&self) -> &VecZnx<D> {
+        &self.data
+    }
+}
+
+impl<D: DataMut> LWECiphertext<D> {
+    pub fn data_mut(&mut self) -> &VecZnx<D> {
+        &mut self.data
+    }
+}
+
+impl<D: DataRef> fmt::Debug for LWECiphertext<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self)
+    }
+}
+
+impl<D: DataRef> fmt::Display for LWECiphertext<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "LWECiphertext: basek={} k={}: {}",
+            self.basek(),
+            self.k(),
+            self.data
+        )
+    }
+}
+
+impl<D: DataMut> Reset for LWECiphertext<D> {
+    fn reset(&mut self) {
+        self.data.reset();
+        self.basek = 0;
+        self.k = 0;
+    }
+}
+
+impl<D: DataMut> FillUniform for LWECiphertext<D>
+where
+    VecZnx<D>: FillUniform,
+{
+    fn fill_uniform(&mut self, source: &mut Source) {
+        self.data.fill_uniform(source);
+    }
+}
+
+impl LWECiphertext<Vec<u8>> {
+    pub fn alloc(n: usize, basek: usize, k: usize) -> Self {
+        Self {
+            data: VecZnx::alloc(n + 1, 1, k.div_ceil(basek)),
+            k,
+            basek,
+        }
+    }
+}
+
+impl<D: Data> Infos for LWECiphertext<D>
+where
+    VecZnx<D>: ZnxInfos,
+{
+    type Inner = VecZnx<D>;
+
+    fn n(&self) -> usize {
+        &self.inner().n() - 1
+    }
+
+    fn inner(&self) -> &Self::Inner {
+        &self.data
+    }
+
+    fn basek(&self) -> usize {
+        self.basek
+    }
+
+    fn k(&self) -> usize {
+        self.k
+    }
+}
+
+impl<DataSelf: DataMut> SetMetaData for LWECiphertext<DataSelf> {
+    fn set_k(&mut self, k: usize) {
+        self.k = k
+    }
+
+    fn set_basek(&mut self, basek: usize) {
+        self.basek = basek
+    }
+}
+
+pub trait LWECiphertextToRef {
+    fn to_ref(&self) -> LWECiphertext<&[u8]>;
+}
+
+impl<D: DataRef> LWECiphertextToRef for LWECiphertext<D> {
+    fn to_ref(&self) -> LWECiphertext<&[u8]> {
+        LWECiphertext {
+            data: self.data.to_ref(),
+            basek: self.basek,
+            k: self.k,
+        }
+    }
+}
+
+pub trait LWECiphertextToMut {
+    #[allow(dead_code)]
+    fn to_mut(&mut self) -> LWECiphertext<&mut [u8]>;
+}
+
+impl<D: DataMut> LWECiphertextToMut for LWECiphertext<D> {
+    fn to_mut(&mut self) -> LWECiphertext<&mut [u8]> {
+        LWECiphertext {
+            data: self.data.to_mut(),
+            basek: self.basek,
+            k: self.k,
+        }
+    }
+}
+
+use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
+
+use crate::layouts::{Infos, SetMetaData};
+
+impl<D: DataMut> ReaderFrom for LWECiphertext<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.data.read_from(reader)
+    }
+}
+
+impl<D: DataRef> WriterTo for LWECiphertext<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)?;
+        self.data.write_to(writer)
+    }
+}

poulpy-core/src/layouts/lwe_ksk.rs

@@ -0,0 +1,88 @@
+use std::fmt;
+
+use poulpy_backend::hal::{
+    api::{FillUniform, Reset},
+    layouts::{Data, DataMut, DataRef, MatZnx, ReaderFrom, WriterTo},
+    source::Source,
+};
+
+use crate::layouts::{GGLWESwitchingKey, Infos};
+
+#[derive(PartialEq, Eq, Clone)]
+pub struct LWESwitchingKey<D: Data>(pub(crate) GGLWESwitchingKey<D>);
+
+impl LWESwitchingKey<Vec<u8>> {
+    pub fn alloc(n: usize, basek: usize, k: usize, rows: usize) -> Self {
+        Self(GGLWESwitchingKey::alloc(n, basek, k, rows, 1, 1, 1))
+    }
+}
+
+impl<D: DataRef> fmt::Debug for LWESwitchingKey<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self)
+    }
+}
+
+impl<D: DataMut> FillUniform for LWESwitchingKey<D> {
+    fn fill_uniform(&mut self, source: &mut Source) {
+        self.0.fill_uniform(source);
+    }
+}
+
+impl<D: DataMut> Reset for LWESwitchingKey<D> {
+    fn reset(&mut self) {
+        self.0.reset();
+    }
+}
+
+impl<D: DataRef> fmt::Display for LWESwitchingKey<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "(LWESwitchingKey) {}", self.0)
+    }
+}
+
+impl<D: Data> Infos for LWESwitchingKey<D> {
+    type Inner = MatZnx<D>;
+
+    fn inner(&self) -> &Self::Inner {
+        self.0.inner()
+    }
+
+    fn basek(&self) -> usize {
+        self.0.basek()
+    }
+
+    fn k(&self) -> usize {
+        self.0.k()
+    }
+}
+
+impl<D: Data> LWESwitchingKey<D> {
+    pub fn digits(&self) -> usize {
+        self.0.digits()
+    }
+
+    pub fn rank(&self) -> usize {
+        self.0.rank()
+    }
+
+    pub fn rank_in(&self) -> usize {
+        self.0.rank_in()
+    }
+
+    pub fn rank_out(&self) -> usize {
+        self.0.rank_out()
+    }
+}
+
+impl<D: DataMut> ReaderFrom for LWESwitchingKey<D> {
+    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
+        self.0.read_from(reader)
+    }
+}
+
+impl<D: DataRef> WriterTo for LWESwitchingKey<D> {
+    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
+        self.0.write_to(writer)
+    }
+}

poulpy-core/src/layouts/lwe_pt.rs

@@ -0,0 +1,95 @@
+use std::fmt;
+
+use poulpy_backend::hal::layouts::{Data, DataMut, DataRef, VecZnx, VecZnxToMut, VecZnxToRef};
+
+use crate::layouts::{Infos, SetMetaData};
+
+pub struct LWEPlaintext<D: Data> {
+    pub(crate) data: VecZnx<D>,
+    pub(crate) k: usize,
+    pub(crate) basek: usize,
+}
+
+impl LWEPlaintext<Vec<u8>> {
+    pub fn alloc(basek: usize, k: usize) -> Self {
+        Self {
+            data: VecZnx::alloc(1, 1, k.div_ceil(basek)),
+            k,
+            basek,
+        }
+    }
+}
+
+impl<D: DataRef> fmt::Display for LWEPlaintext<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "LWEPlaintext: basek={} k={}: {}",
+            self.basek(),
+            self.k(),
+            self.data
+        )
+    }
+}
+
+impl<D: Data> Infos for LWEPlaintext<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: DataMut> SetMetaData for LWEPlaintext<D> {
+    fn set_k(&mut self, k: usize) {
+        self.k = k
+    }
+
+    fn set_basek(&mut self, basek: usize) {
+        self.basek = basek
+    }
+}
+
+pub trait LWEPlaintextToRef {
+    #[allow(dead_code)]
+    fn to_ref(&self) -> LWEPlaintext<&[u8]>;
+}
+
+impl<D: DataRef> LWEPlaintextToRef for LWEPlaintext<D> {
+    fn to_ref(&self) -> LWEPlaintext<&[u8]> {
+        LWEPlaintext {
+            data: self.data.to_ref(),
+            basek: self.basek,
+            k: self.k,
+        }
+    }
+}
+
+pub trait LWEPlaintextToMut {
+    #[allow(dead_code)]
+    fn to_mut(&mut self) -> LWEPlaintext<&mut [u8]>;
+}
+
+impl<D: DataMut> LWEPlaintextToMut for LWEPlaintext<D> {
+    fn to_mut(&mut self) -> LWEPlaintext<&mut [u8]> {
+        LWEPlaintext {
+            data: self.data.to_mut(),
+            basek: self.basek,
+            k: self.k,
+        }
+    }
+}
+
+impl<D: DataMut> LWEPlaintext<D> {
+    pub fn data_mut(&mut self) -> &mut VecZnx<D> {
+        &mut self.data
+    }
+}

poulpy-core/src/layouts/lwe_sk.rs

@@ -0,0 +1,81 @@
+use poulpy_backend::hal::{
+    api::{ZnxInfos, ZnxView, ZnxZero},
+    layouts::{Data, DataMut, DataRef, ScalarZnx},
+    source::Source,
+};
+
+use crate::dist::Distribution;
+
+pub struct LWESecret<D: Data> {
+    pub(crate) data: ScalarZnx<D>,
+    pub(crate) dist: Distribution,
+}
+
+impl LWESecret<Vec<u8>> {
+    pub fn alloc(n: usize) -> Self {
+        Self {
+            data: ScalarZnx::alloc(n, 1),
+            dist: Distribution::NONE,
+        }
+    }
+}
+
+impl<D: DataRef> LWESecret<D> {
+    pub fn raw(&self) -> &[i64] {
+        self.data.at(0, 0)
+    }
+
+    pub fn dist(&self) -> Distribution {
+        self.dist
+    }
+
+    pub fn data(&self) -> &ScalarZnx<D> {
+        &self.data
+    }
+}
+
+impl<D: Data> LWESecret<D> {
+    pub fn n(&self) -> usize {
+        self.data.n()
+    }
+
+    pub fn log_n(&self) -> usize {
+        self.data.log_n()
+    }
+
+    pub fn rank(&self) -> usize {
+        self.data.cols()
+    }
+}
+
+impl<D: DataMut> LWESecret<D> {
+    pub fn fill_ternary_prob(&mut self, prob: f64, source: &mut Source) {
+        self.data.fill_ternary_prob(0, prob, source);
+        self.dist = Distribution::TernaryProb(prob);
+    }
+
+    pub fn fill_ternary_hw(&mut self, hw: usize, source: &mut Source) {
+        self.data.fill_ternary_hw(0, hw, source);
+        self.dist = Distribution::TernaryFixed(hw);
+    }
+
+    pub fn fill_binary_prob(&mut self, prob: f64, source: &mut Source) {
+        self.data.fill_binary_prob(0, prob, source);
+        self.dist = Distribution::BinaryProb(prob);
+    }
+
+    pub fn fill_binary_hw(&mut self, hw: usize, source: &mut Source) {
+        self.data.fill_binary_hw(0, hw, source);
+        self.dist = Distribution::BinaryFixed(hw);
+    }
+
+    pub fn fill_binary_block(&mut self, block_size: usize, source: &mut Source) {
+        self.data.fill_binary_block(0, block_size, source);
+        self.dist = Distribution::BinaryBlock(block_size);
+    }
+
+    pub fn fill_zero(&mut self) {
+        self.data.zero();
+        self.dist = Distribution::ZERO;
+    }
+}

poulpy-core/src/layouts/lwe_to_glwe_ksk.rs

@@ -0,0 +1,88 @@
+use std::fmt;
+
+use poulpy_backend::hal::{
+    api::{FillUniform, Reset},
+    layouts::{Data, DataMut, DataRef, MatZnx, ReaderFrom, WriterTo},
+    source::Source,
+};
+
+use crate::layouts::{GGLWESwitchingKey, Infos};
+
+#[derive(PartialEq, Eq, Clone)]
+pub struct LWEToGLWESwitchingKey<D: Data>(pub(crate) GGLWESwitchingKey<D>);
+
+impl<D: DataRef> fmt::Debug for LWEToGLWESwitchingKey<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self)
+    }
+}
+
+impl<D: DataMut> FillUniform for LWEToGLWESwitchingKey<D> {
+    fn fill_uniform(&mut self, source: &mut Source) {
+        self.0.fill_uniform(source);
+    }
+}
+
+impl<D: DataMut> Reset for LWEToGLWESwitchingKey<D> {
+    fn reset(&mut self) {
+        self.0.reset();
+    }
+}
+
+impl<D: DataRef> fmt::Display for LWEToGLWESwitchingKey<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "(LWEToGLWESwitchingKey) {}", self.0)
+    }
+}
+
+impl<D: Data> Infos for LWEToGLWESwitchingKey<D> {
+    type Inner = MatZnx<D>;
+
+    fn inner(&self) -> &Self::Inner {
+        self.0.inner()
+    }
+
+    fn basek(&self) -> usize {
+        self.0.basek()
+    }
+
+    fn k(&self) -> usize {
+        self.0.k()
+    }
+}
+
+impl<D: Data> LWEToGLWESwitchingKey<D> {
+    pub fn digits(&self) -> usize {
+        self.0.digits()
+    }
+
+    pub fn rank(&self) -> usize {
+        self.0.rank()
+    }
+
+    pub fn rank_in(&self) -> usize {
+        self.0.rank_in()
+    }
+
+    pub fn rank_out(&self) -> usize {
+        self.0.rank_out()
+    }
+}
+
+impl<D: DataMut> ReaderFrom for LWEToGLWESwitchingKey<D> {
+    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
+        self.0.read_from(reader)
+    }
+}
+
+impl<D: DataRef> WriterTo for LWEToGLWESwitchingKey<D> {
+    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
+        self.0.write_to(writer)
+    }
+}
+
+impl LWEToGLWESwitchingKey<Vec<u8>> {
+    pub fn alloc(n: usize, basek: usize, k: usize, rows: usize, rank_out: usize) -> Self {
+        Self(GGLWESwitchingKey::alloc(n, basek, k, rows, 1, 1, rank_out))
+    }
+}

poulpy-core/src/layouts/mod.rs

@@ -0,0 +1,36 @@
+mod gglwe_atk;
+mod gglwe_ct;
+mod gglwe_ksk;
+mod gglwe_tsk;
+mod ggsw_ct;
+mod glwe_ct;
+mod glwe_pk;
+mod glwe_pt;
+mod glwe_sk;
+mod glwe_to_lwe_ksk;
+mod infos;
+mod lwe_ct;
+mod lwe_ksk;
+mod lwe_pt;
+mod lwe_sk;
+mod lwe_to_glwe_ksk;
+
+pub mod compressed;
+pub mod prepared;
+
+pub use gglwe_atk::*;
+pub use gglwe_ct::*;
+pub use gglwe_ksk::*;
+pub use gglwe_tsk::*;
+pub use ggsw_ct::*;
+pub use glwe_ct::*;
+pub use glwe_pk::*;
+pub use glwe_pt::*;
+pub use glwe_sk::*;
+pub use glwe_to_lwe_ksk::*;
+pub use infos::*;
+pub use lwe_ct::*;
+pub use lwe_ksk::*;
+pub use lwe_pt::*;
+pub use lwe_sk::*;
+pub use lwe_to_glwe_ksk::*;

poulpy-core/src/layouts/prepared/gglwe_atk.rs

@@ -0,0 +1,101 @@
+use poulpy_backend::hal::{
+    api::{VmpPMatAlloc, VmpPMatAllocBytes, VmpPrepare},
+    layouts::{Backend, Data, DataMut, DataRef, Module, Scratch, VmpPMat},
+};
+
+use crate::layouts::{
+    GGLWEAutomorphismKey, Infos,
+    prepared::{GGLWESwitchingKeyPrepared, Prepare, PrepareAlloc},
+};
+
+#[derive(PartialEq, Eq)]
+pub struct GGLWEAutomorphismKeyPrepared<D: Data, B: Backend> {
+    pub(crate) key: GGLWESwitchingKeyPrepared<D, B>,
+    pub(crate) p: i64,
+}
+
+impl<B: Backend> GGLWEAutomorphismKeyPrepared<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>,
+    {
+        GGLWEAutomorphismKeyPrepared::<Vec<u8>, B> {
+            key: GGLWESwitchingKeyPrepared::alloc(module, n, basek, k, rows, digits, rank, rank),
+            p: 0,
+        }
+    }
+
+    pub fn bytes_of(module: &Module<B>, n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> usize
+    where
+        Module<B>: VmpPMatAllocBytes,
+    {
+        GGLWESwitchingKeyPrepared::bytes_of(module, n, basek, k, rows, digits, rank, rank)
+    }
+}
+
+impl<D: Data, B: Backend> Infos for GGLWEAutomorphismKeyPrepared<D, B> {
+    type Inner = VmpPMat<D, B>;
+
+    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, B: Backend> GGLWEAutomorphismKeyPrepared<D, B> {
+    pub fn p(&self) -> i64 {
+        self.p
+    }
+
+    pub fn digits(&self) -> usize {
+        self.key.digits()
+    }
+
+    pub fn rank(&self) -> usize {
+        self.key.rank()
+    }
+
+    pub fn rank_in(&self) -> usize {
+        self.key.rank_in()
+    }
+
+    pub fn rank_out(&self) -> usize {
+        self.key.rank_out()
+    }
+}
+
+impl<D: DataMut, DR: DataRef, B: Backend> Prepare<B, GGLWEAutomorphismKey<DR>> for GGLWEAutomorphismKeyPrepared<D, B>
+where
+    Module<B>: VmpPrepare<B>,
+{
+    fn prepare(&mut self, module: &Module<B>, other: &GGLWEAutomorphismKey<DR>, scratch: &mut Scratch<B>) {
+        self.key.prepare(module, &other.key, scratch);
+        self.p = other.p;
+    }
+}
+
+impl<D: DataRef, B: Backend> PrepareAlloc<B, GGLWEAutomorphismKeyPrepared<Vec<u8>, B>> for GGLWEAutomorphismKey<D>
+where
+    Module<B>: VmpPMatAlloc<B> + VmpPrepare<B>,
+{
+    fn prepare_alloc(&self, module: &Module<B>, scratch: &mut Scratch<B>) -> GGLWEAutomorphismKeyPrepared<Vec<u8>, B> {
+        let mut atk_prepared: GGLWEAutomorphismKeyPrepared<Vec<u8>, B> = GGLWEAutomorphismKeyPrepared::alloc(
+            module,
+            self.n(),
+            self.basek(),
+            self.k(),
+            self.rows(),
+            self.digits(),
+            self.rank(),
+        );
+        atk_prepared.prepare(module, self, scratch);
+        atk_prepared
+    }
+}

poulpy-core/src/layouts/prepared/gglwe_ct.rs

@@ -0,0 +1,156 @@
+use poulpy_backend::hal::{
+    api::{VmpPMatAlloc, VmpPMatAllocBytes, VmpPrepare},
+    layouts::{Backend, Data, DataMut, DataRef, Module, Scratch, VmpPMat},
+};
+
+use crate::layouts::{
+    GGLWECiphertext, Infos,
+    prepared::{Prepare, PrepareAlloc},
+};
+
+#[derive(PartialEq, Eq)]
+pub struct GGLWECiphertextPrepared<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> GGLWECiphertextPrepared<Vec<u8>, B> {
+    #[allow(clippy::too_many_arguments)]
+    pub fn alloc(
+        module: &Module<B>,
+        n: usize,
+        basek: usize,
+        k: usize,
+        rows: usize,
+        digits: usize,
+        rank_in: usize,
+        rank_out: usize,
+    ) -> Self
+    where
+        Module<B>: VmpPMatAlloc<B>,
+    {
+        let size: usize = k.div_ceil(basek);
+        debug_assert!(
+            size > digits,
+            "invalid gglwe: ceil(k/basek): {} <= digits: {}",
+            size,
+            digits
+        );
+
+        assert!(
+            rows * digits <= size,
+            "invalid gglwe: rows: {} * digits:{} > ceil(k/basek): {}",
+            rows,
+            digits,
+            size
+        );
+
+        Self {
+            data: module.vmp_pmat_alloc(n, rows, rank_in, rank_out + 1, size),
+            basek,
+            k,
+            digits,
+        }
+    }
+
+    #[allow(clippy::too_many_arguments)]
+    pub fn bytes_of(
+        module: &Module<B>,
+        n: usize,
+        basek: usize,
+        k: usize,
+        rows: usize,
+        digits: usize,
+        rank_in: usize,
+        rank_out: usize,
+    ) -> usize
+    where
+        Module<B>: VmpPMatAllocBytes,
+    {
+        let size: usize = k.div_ceil(basek);
+        debug_assert!(
+            size > digits,
+            "invalid gglwe: ceil(k/basek): {} <= digits: {}",
+            size,
+            digits
+        );
+
+        assert!(
+            rows * digits <= size,
+            "invalid gglwe: rows: {} * digits:{} > ceil(k/basek): {}",
+            rows,
+            digits,
+            size
+        );
+
+        module.vmp_pmat_alloc_bytes(n, rows, rank_in, rank_out + 1, rows)
+    }
+}
+
+impl<D: Data, B: Backend> Infos for GGLWECiphertextPrepared<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> GGLWECiphertextPrepared<D, B> {
+    pub fn rank(&self) -> usize {
+        self.data.cols_out() - 1
+    }
+
+    pub fn digits(&self) -> usize {
+        self.digits
+    }
+
+    pub fn rank_in(&self) -> usize {
+        self.data.cols_in()
+    }
+
+    pub fn rank_out(&self) -> usize {
+        self.data.cols_out() - 1
+    }
+}
+
+impl<D: DataMut, DR: DataRef, B: Backend> Prepare<B, GGLWECiphertext<DR>> for GGLWECiphertextPrepared<D, B>
+where
+    Module<B>: VmpPrepare<B>,
+{
+    fn prepare(&mut self, module: &Module<B>, other: &GGLWECiphertext<DR>, scratch: &mut Scratch<B>) {
+        module.vmp_prepare(&mut self.data, &other.data, scratch);
+        self.basek = other.basek;
+        self.k = other.k;
+        self.digits = other.digits;
+    }
+}
+
+impl<D: DataRef, B: Backend> PrepareAlloc<B, GGLWECiphertextPrepared<Vec<u8>, B>> for GGLWECiphertext<D>
+where
+    Module<B>: VmpPMatAlloc<B> + VmpPrepare<B>,
+{
+    fn prepare_alloc(&self, module: &Module<B>, scratch: &mut Scratch<B>) -> GGLWECiphertextPrepared<Vec<u8>, B> {
+        let mut atk_prepared: GGLWECiphertextPrepared<Vec<u8>, B> = GGLWECiphertextPrepared::alloc(
+            module,
+            self.n(),
+            self.basek(),
+            self.k(),
+            self.rows(),
+            self.digits(),
+            self.rank_in(),
+            self.rank_out(),
+        );
+        atk_prepared.prepare(module, self, scratch);
+        atk_prepared
+    }
+}

poulpy-core/src/layouts/prepared/gglwe_ksk.rs

@@ -0,0 +1,129 @@
+use poulpy_backend::hal::{
+    api::{VmpPMatAlloc, VmpPMatAllocBytes, VmpPrepare},
+    layouts::{Backend, Data, DataMut, DataRef, Module, Scratch, VmpPMat},
+};
+
+use crate::layouts::{
+    GGLWESwitchingKey, Infos,
+    prepared::{GGLWECiphertextPrepared, Prepare, PrepareAlloc},
+};
+
+#[derive(PartialEq, Eq)]
+pub struct GGLWESwitchingKeyPrepared<D: Data, B: Backend> {
+    pub(crate) key: GGLWECiphertextPrepared<D, B>,
+    pub(crate) sk_in_n: usize,  // Degree of sk_in
+    pub(crate) sk_out_n: usize, // Degree of sk_out
+}
+
+impl<B: Backend> GGLWESwitchingKeyPrepared<Vec<u8>, B> {
+    #[allow(clippy::too_many_arguments)]
+    pub fn alloc(
+        module: &Module<B>,
+        n: usize,
+        basek: usize,
+        k: usize,
+        rows: usize,
+        digits: usize,
+        rank_in: usize,
+        rank_out: usize,
+    ) -> Self
+    where
+        Module<B>: VmpPMatAlloc<B>,
+    {
+        GGLWESwitchingKeyPrepared::<Vec<u8>, B> {
+            key: GGLWECiphertextPrepared::alloc(module, n, basek, k, rows, digits, rank_in, rank_out),
+            sk_in_n: 0,
+            sk_out_n: 0,
+        }
+    }
+
+    #[allow(clippy::too_many_arguments)]
+    pub fn bytes_of(
+        module: &Module<B>,
+        n: usize,
+        basek: usize,
+        k: usize,
+        rows: usize,
+        digits: usize,
+        rank_in: usize,
+        rank_out: usize,
+    ) -> usize
+    where
+        Module<B>: VmpPMatAllocBytes,
+    {
+        GGLWECiphertextPrepared::bytes_of(module, n, basek, k, rows, digits, rank_in, rank_out)
+    }
+}
+
+impl<D: Data, B: Backend> Infos for GGLWESwitchingKeyPrepared<D, B> {
+    type Inner = VmpPMat<D, B>;
+
+    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, B: Backend> GGLWESwitchingKeyPrepared<D, B> {
+    pub fn rank(&self) -> usize {
+        self.key.data.cols_out() - 1
+    }
+
+    pub fn rank_in(&self) -> usize {
+        self.key.data.cols_in()
+    }
+
+    pub fn rank_out(&self) -> usize {
+        self.key.data.cols_out() - 1
+    }
+
+    pub fn digits(&self) -> usize {
+        self.key.digits()
+    }
+
+    pub fn sk_degree_in(&self) -> usize {
+        self.sk_in_n
+    }
+
+    pub fn sk_degree_out(&self) -> usize {
+        self.sk_out_n
+    }
+}
+
+impl<D: DataMut, DR: DataRef, B: Backend> Prepare<B, GGLWESwitchingKey<DR>> for GGLWESwitchingKeyPrepared<D, B>
+where
+    Module<B>: VmpPrepare<B>,
+{
+    fn prepare(&mut self, module: &Module<B>, other: &GGLWESwitchingKey<DR>, scratch: &mut Scratch<B>) {
+        self.key.prepare(module, &other.key, scratch);
+        self.sk_in_n = other.sk_in_n;
+        self.sk_out_n = other.sk_out_n;
+    }
+}
+
+impl<D: DataRef, B: Backend> PrepareAlloc<B, GGLWESwitchingKeyPrepared<Vec<u8>, B>> for GGLWESwitchingKey<D>
+where
+    Module<B>: VmpPMatAlloc<B> + VmpPrepare<B>,
+{
+    fn prepare_alloc(&self, module: &Module<B>, scratch: &mut Scratch<B>) -> GGLWESwitchingKeyPrepared<Vec<u8>, B> {
+        let mut atk_prepared: GGLWESwitchingKeyPrepared<Vec<u8>, B> = GGLWESwitchingKeyPrepared::alloc(
+            module,
+            self.n(),
+            self.basek(),
+            self.k(),
+            self.rows(),
+            self.digits(),
+            self.rank_in(),
+            self.rank_out(),
+        );
+        atk_prepared.prepare(module, self, scratch);
+        atk_prepared
+    }
+}

poulpy-core/src/layouts/prepared/gglwe_tsk.rs

@@ -0,0 +1,131 @@
+use poulpy_backend::hal::{
+    api::{VmpPMatAlloc, VmpPMatAllocBytes, VmpPrepare},
+    layouts::{Backend, Data, DataMut, DataRef, Module, Scratch, VmpPMat},
+};
+
+use crate::layouts::{
+    GGLWETensorKey, Infos,
+    prepared::{GGLWESwitchingKeyPrepared, Prepare, PrepareAlloc},
+};
+
+#[derive(PartialEq, Eq)]
+pub struct GGLWETensorKeyPrepared<D: Data, B: Backend> {
+    pub(crate) keys: Vec<GGLWESwitchingKeyPrepared<D, B>>,
+}
+
+impl<B: Backend> GGLWETensorKeyPrepared<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 mut keys: Vec<GGLWESwitchingKeyPrepared<Vec<u8>, B>> = Vec::new();
+        let pairs: usize = (((rank + 1) * rank) >> 1).max(1);
+        (0..pairs).for_each(|_| {
+            keys.push(GGLWESwitchingKeyPrepared::alloc(
+                module, n, basek, k, rows, digits, 1, rank,
+            ));
+        });
+        Self { keys }
+    }
+
+    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 pairs: usize = (((rank + 1) * rank) >> 1).max(1);
+        pairs * GGLWESwitchingKeyPrepared::bytes_of(module, n, basek, k, rows, digits, 1, rank)
+    }
+}
+
+impl<D: Data, B: Backend> Infos for GGLWETensorKeyPrepared<D, B> {
+    type Inner = VmpPMat<D, B>;
+
+    fn inner(&self) -> &Self::Inner {
+        self.keys[0].inner()
+    }
+
+    fn basek(&self) -> usize {
+        self.keys[0].basek()
+    }
+
+    fn k(&self) -> usize {
+        self.keys[0].k()
+    }
+}
+
+impl<D: Data, B: Backend> GGLWETensorKeyPrepared<D, B> {
+    pub fn rank(&self) -> usize {
+        self.keys[0].rank()
+    }
+
+    pub fn rank_in(&self) -> usize {
+        self.keys[0].rank_in()
+    }
+
+    pub fn rank_out(&self) -> usize {
+        self.keys[0].rank_out()
+    }
+
+    pub fn digits(&self) -> usize {
+        self.keys[0].digits()
+    }
+}
+
+impl<D: DataMut, B: Backend> GGLWETensorKeyPrepared<D, B> {
+    // Returns a mutable reference to GLWESwitchingKey_{s}(s[i] * s[j])
+    pub fn at_mut(&mut self, mut i: usize, mut j: usize) -> &mut GGLWESwitchingKeyPrepared<D, B> {
+        if i > j {
+            std::mem::swap(&mut i, &mut j);
+        };
+        let rank: usize = self.rank();
+        &mut self.keys[i * rank + j - (i * (i + 1) / 2)]
+    }
+}
+
+impl<D: DataRef, B: Backend> GGLWETensorKeyPrepared<D, B> {
+    // Returns a reference to GLWESwitchingKey_{s}(s[i] * s[j])
+    pub fn at(&self, mut i: usize, mut j: usize) -> &GGLWESwitchingKeyPrepared<D, B> {
+        if i > j {
+            std::mem::swap(&mut i, &mut j);
+        };
+        let rank: usize = self.rank();
+        &self.keys[i * rank + j - (i * (i + 1) / 2)]
+    }
+}
+
+impl<D: DataMut, DR: DataRef, B: Backend> Prepare<B, GGLWETensorKey<DR>> for GGLWETensorKeyPrepared<D, B>
+where
+    Module<B>: VmpPrepare<B>,
+{
+    fn prepare(&mut self, module: &Module<B>, other: &GGLWETensorKey<DR>, scratch: &mut Scratch<B>) {
+        #[cfg(debug_assertions)]
+        {
+            assert_eq!(self.keys.len(), other.keys.len());
+        }
+        self.keys
+            .iter_mut()
+            .zip(other.keys.iter())
+            .for_each(|(a, b)| {
+                a.prepare(module, b, scratch);
+            });
+    }
+}
+
+impl<D: DataRef, B: Backend> PrepareAlloc<B, GGLWETensorKeyPrepared<Vec<u8>, B>> for GGLWETensorKey<D>
+where
+    Module<B>: VmpPMatAlloc<B> + VmpPrepare<B>,
+{
+    fn prepare_alloc(&self, module: &Module<B>, scratch: &mut Scratch<B>) -> GGLWETensorKeyPrepared<Vec<u8>, B> {
+        let mut tsk_prepared: GGLWETensorKeyPrepared<Vec<u8>, B> = GGLWETensorKeyPrepared::alloc(
+            module,
+            self.n(),
+            self.basek(),
+            self.k(),
+            self.rows(),
+            self.digits(),
+            self.rank(),
+        );
+        tsk_prepared.prepare(module, self, scratch);
+        tsk_prepared
+    }
+}

poulpy-core/src/layouts/prepared/ggsw_ct.rs

@@ -0,0 +1,135 @@
+use poulpy_backend::hal::{
+    api::{VmpPMatAlloc, VmpPMatAllocBytes, VmpPrepare},
+    layouts::{Backend, Data, DataMut, DataRef, Module, Scratch, VmpPMat},
+};
+
+use crate::layouts::{
+    GGSWCiphertext, Infos,
+    prepared::{Prepare, PrepareAlloc},
+};
+
+#[derive(PartialEq, Eq)]
+pub struct GGSWCiphertextPrepared<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> GGSWCiphertextPrepared<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,
+            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)
+    }
+}
+
+impl<D: Data, B: Backend> Infos for GGSWCiphertextPrepared<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> GGSWCiphertextPrepared<D, B> {
+    pub fn rank(&self) -> usize {
+        self.data.cols_out() - 1
+    }
+
+    pub fn digits(&self) -> usize {
+        self.digits
+    }
+}
+
+impl<D: DataRef, B: Backend> GGSWCiphertextPrepared<D, B> {
+    pub fn data(&self) -> &VmpPMat<D, B> {
+        &self.data
+    }
+}
+
+impl<D: DataMut, DR: DataRef, B: Backend> Prepare<B, GGSWCiphertext<DR>> for GGSWCiphertextPrepared<D, B>
+where
+    Module<B>: VmpPrepare<B>,
+{
+    fn prepare(&mut self, module: &Module<B>, other: &GGSWCiphertext<DR>, scratch: &mut Scratch<B>) {
+        module.vmp_prepare(&mut self.data, &other.data, scratch);
+        self.k = other.k;
+        self.basek = other.basek;
+        self.digits = other.digits;
+    }
+}
+
+impl<D: DataRef, B: Backend> PrepareAlloc<B, GGSWCiphertextPrepared<Vec<u8>, B>> for GGSWCiphertext<D>
+where
+    Module<B>: VmpPMatAlloc<B> + VmpPrepare<B>,
+{
+    fn prepare_alloc(&self, module: &Module<B>, scratch: &mut Scratch<B>) -> GGSWCiphertextPrepared<Vec<u8>, B> {
+        let mut ggsw_prepared: GGSWCiphertextPrepared<Vec<u8>, B> = GGSWCiphertextPrepared::alloc(
+            module,
+            self.n(),
+            self.basek(),
+            self.k(),
+            self.rows(),
+            self.digits(),
+            self.rank(),
+        );
+        ggsw_prepared.prepare(module, self, scratch);
+        ggsw_prepared
+    }
+}

poulpy-core/src/layouts/prepared/glwe_ct.rs

@@ -0,0 +1,177 @@
+use poulpy_backend::hal::{
+    api::{FillUniform, Reset, VecZnxCopy, VecZnxFillUniform},
+    layouts::{Backend, Data, DataMut, DataRef, Module, ReaderFrom, VecZnx, WriterTo},
+};
+
+
+use crate::layouts::{GLWECiphertext, Infos, compressed::Decompress};
+use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
+use std::fmt;
+
+#[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> fmt::Debug for GLWECiphertextCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self)
+    }
+}
+
+impl<D: DataRef> fmt::Display for GLWECiphertextCompressed<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "GLWECiphertextCompressed: basek={} k={} rank={} seed={:?}: {}",
+            self.basek(),
+            self.k(),
+            self.rank,
+            self.seed,
+            self.data
+        )
+    }
+}
+
+impl<D: DataMut> Reset for GLWECiphertextCompressed<D> {
+    fn reset(&mut self) {
+        self.data.reset();
+        self.basek = 0;
+        self.k = 0;
+        self.rank = 0;
+        self.seed = [0u8; 32];
+    }
+}
+
+impl<D: DataMut> FillUniform for GLWECiphertextCompressed<D> {
+    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(n: usize, basek: usize, k: usize, rank: usize) -> Self {
+        Self {
+            data: VecZnx::alloc(n, 1, k.div_ceil(basek)),
+            basek,
+            k,
+            rank,
+            seed: [0u8; 32],
+        }
+    }
+
+    pub fn bytes_of(n: usize, basek: usize, k: usize) -> usize {
+        GLWECiphertext::bytes_of(n, 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_exact(&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, B: Backend, DR: DataRef> Decompress<B, GLWECiphertextCompressed<DR>> for GLWECiphertext<D> {
+    fn decompress(&mut self, module: &Module<B>, other: &GLWECiphertextCompressed<DR>)
+    where
+        Module<B>: VecZnxCopy + VecZnxFillUniform,
+    {
+        #[cfg(debug_assertions)]
+        {
+            use poulpy_backend::hal::api::ZnxInfos;
+
+            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);
+    }
+}
+
+impl<D: DataMut> GLWECiphertext<D> {
+    pub(crate) fn decompress_internal<DataOther, B: Backend>(
+        &mut self,
+        module: &Module<B>,
+        other: &GLWECiphertextCompressed<DataOther>,
+        source: &mut Source,
+    ) where
+        DataOther: DataRef,
+        Module<B>: VecZnxCopy + VecZnxFillUniform,
+    {
+        #[cfg(debug_assertions)]
+        {
+            assert_eq!(self.rank(), other.rank())
+        }
+
+        let k: usize = other.k;
+        let basek: usize = other.basek;
+        let cols: usize = other.rank() + 1;
+        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;
+    }
+}

poulpy-core/src/layouts/prepared/glwe_pk.rs

@@ -0,0 +1,95 @@
+use poulpy_backend::hal::{
+    api::{VecZnxDftAlloc, VecZnxDftAllocBytes, VecZnxDftFromVecZnx},
+    layouts::{Backend, Data, DataMut, DataRef, Module, Scratch, VecZnxDft},
+};
+
+use crate::{
+    dist::Distribution,
+    layouts::{
+        GLWEPublicKey, Infos,
+        prepared::{Prepare, PrepareAlloc},
+    },
+};
+
+#[derive(PartialEq, Eq)]
+pub struct GLWEPublicKeyPrepared<D: Data, B: Backend> {
+    pub(crate) data: VecZnxDft<D, B>,
+    pub(crate) basek: usize,
+    pub(crate) k: usize,
+    pub(crate) dist: Distribution,
+}
+
+impl<D: Data, B: Backend> Infos for GLWEPublicKeyPrepared<D, B> {
+    type Inner = VecZnxDft<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> GLWEPublicKeyPrepared<D, B> {
+    pub fn rank(&self) -> usize {
+        self.cols() - 1
+    }
+}
+
+impl<B: Backend> GLWEPublicKeyPrepared<Vec<u8>, B> {
+    pub fn alloc(module: &Module<B>, n: usize, basek: usize, k: usize, rank: usize) -> Self
+    where
+        Module<B>: VecZnxDftAlloc<B>,
+    {
+        Self {
+            data: module.vec_znx_dft_alloc(n, rank + 1, k.div_ceil(basek)),
+            basek,
+            k,
+            dist: Distribution::NONE,
+        }
+    }
+
+    pub fn bytes_of(module: &Module<B>, n: usize, basek: usize, k: usize, rank: usize) -> usize
+    where
+        Module<B>: VecZnxDftAllocBytes,
+    {
+        module.vec_znx_dft_alloc_bytes(n, rank + 1, k.div_ceil(basek))
+    }
+}
+
+impl<D: DataRef, B: Backend> PrepareAlloc<B, GLWEPublicKeyPrepared<Vec<u8>, B>> for GLWEPublicKey<D>
+where
+    Module<B>: VecZnxDftAlloc<B> + VecZnxDftFromVecZnx<B>,
+{
+    fn prepare_alloc(&self, module: &Module<B>, scratch: &mut Scratch<B>) -> GLWEPublicKeyPrepared<Vec<u8>, B> {
+        let mut pk_prepared: GLWEPublicKeyPrepared<Vec<u8>, B> =
+            GLWEPublicKeyPrepared::alloc(module, self.n(), self.basek(), self.k(), self.rank());
+        pk_prepared.prepare(module, self, scratch);
+        pk_prepared
+    }
+}
+
+impl<DM: DataMut, DR: DataRef, B: Backend> Prepare<B, GLWEPublicKey<DR>> for GLWEPublicKeyPrepared<DM, B>
+where
+    Module<B>: VecZnxDftFromVecZnx<B>,
+{
+    fn prepare(&mut self, module: &Module<B>, other: &GLWEPublicKey<DR>, _scratch: &mut Scratch<B>) {
+        #[cfg(debug_assertions)]
+        {
+            assert_eq!(self.n(), other.n());
+            assert_eq!(self.size(), other.size());
+        }
+
+        (0..self.cols()).for_each(|i| {
+            module.vec_znx_dft_from_vec_znx(1, 0, &mut self.data, i, &other.data, i);
+        });
+        self.k = other.k;
+        self.basek = other.basek;
+        self.dist = other.dist;
+    }
+}

poulpy-core/src/layouts/prepared/glwe_sk.rs

@@ -0,0 +1,77 @@
+use poulpy_backend::hal::{
+    api::{SvpPPolAlloc, SvpPPolAllocBytes, SvpPrepare, ZnxInfos},
+    layouts::{Backend, Data, DataMut, DataRef, Module, SvpPPol},
+};
+
+use crate::{
+    dist::Distribution,
+    layouts::{
+        GLWESecret,
+        prepared::{Prepare, PrepareAlloc},
+    },
+};
+
+pub struct GLWESecretPrepared<D: Data, B: Backend> {
+    pub(crate) data: SvpPPol<D, B>,
+    pub(crate) dist: Distribution,
+}
+
+impl<B: Backend> GLWESecretPrepared<Vec<u8>, B> {
+    pub fn alloc(module: &Module<B>, n: usize, rank: usize) -> Self
+    where
+        Module<B>: SvpPPolAlloc<B>,
+    {
+        Self {
+            data: module.svp_ppol_alloc(n, rank),
+            dist: Distribution::NONE,
+        }
+    }
+
+    pub fn bytes_of(module: &Module<B>, n: usize, rank: usize) -> usize
+    where
+        Module<B>: SvpPPolAllocBytes,
+    {
+        module.svp_ppol_alloc_bytes(n, rank)
+    }
+}
+
+impl<D: Data, B: Backend> GLWESecretPrepared<D, B> {
+    pub fn n(&self) -> usize {
+        self.data.n()
+    }
+
+    pub fn log_n(&self) -> usize {
+        self.data.log_n()
+    }
+
+    pub fn rank(&self) -> usize {
+        self.data.cols()
+    }
+}
+
+impl<D: DataRef, B: Backend> PrepareAlloc<B, GLWESecretPrepared<Vec<u8>, B>> for GLWESecret<D>
+where
+    Module<B>: SvpPrepare<B> + SvpPPolAlloc<B>,
+{
+    fn prepare_alloc(
+        &self,
+        module: &Module<B>,
+        scratch: &mut poulpy_backend::hal::layouts::Scratch<B>,
+    ) -> GLWESecretPrepared<Vec<u8>, B> {
+        let mut sk_dft: GLWESecretPrepared<Vec<u8>, B> = GLWESecretPrepared::alloc(module, self.n(), self.rank());
+        sk_dft.prepare(module, self, scratch);
+        sk_dft
+    }
+}
+
+impl<DM: DataMut, DR: DataRef, B: Backend> Prepare<B, GLWESecret<DR>> for GLWESecretPrepared<DM, B>
+where
+    Module<B>: SvpPrepare<B>,
+{
+    fn prepare(&mut self, module: &Module<B>, other: &GLWESecret<DR>, _scratch: &mut poulpy_backend::hal::layouts::Scratch<B>) {
+        (0..self.rank()).for_each(|i| {
+            module.svp_prepare(&mut self.data, i, &other.data, i);
+        });
+        self.dist = other.dist
+    }
+}

poulpy-core/src/layouts/prepared/glwe_to_lwe_ksk.rs

@@ -0,0 +1,91 @@
+use poulpy_backend::hal::{
+    api::{VmpPMatAlloc, VmpPMatAllocBytes, VmpPrepare},
+    layouts::{Backend, Data, DataMut, DataRef, Module, Scratch, VmpPMat},
+};
+
+use crate::layouts::{
+    GLWEToLWESwitchingKey, Infos,
+    prepared::{GGLWESwitchingKeyPrepared, Prepare, PrepareAlloc},
+};
+
+#[derive(PartialEq, Eq)]
+pub struct GLWEToLWESwitchingKeyPrepared<D: Data, B: Backend>(pub(crate) GGLWESwitchingKeyPrepared<D, B>);
+
+impl<D: Data, B: Backend> Infos for GLWEToLWESwitchingKeyPrepared<D, B> {
+    type Inner = VmpPMat<D, B>;
+
+    fn inner(&self) -> &Self::Inner {
+        self.0.inner()
+    }
+
+    fn basek(&self) -> usize {
+        self.0.basek()
+    }
+
+    fn k(&self) -> usize {
+        self.0.k()
+    }
+}
+
+impl<D: Data, B: Backend> GLWEToLWESwitchingKeyPrepared<D, B> {
+    pub fn digits(&self) -> usize {
+        self.0.digits()
+    }
+
+    pub fn rank(&self) -> usize {
+        self.0.rank()
+    }
+
+    pub fn rank_in(&self) -> usize {
+        self.0.rank_in()
+    }
+
+    pub fn rank_out(&self) -> usize {
+        self.0.rank_out()
+    }
+}
+
+impl<B: Backend> GLWEToLWESwitchingKeyPrepared<Vec<u8>, B> {
+    pub fn alloc(module: &Module<B>, n: usize, basek: usize, k: usize, rows: usize, rank_in: usize) -> Self
+    where
+        Module<B>: VmpPMatAlloc<B>,
+    {
+        Self(GGLWESwitchingKeyPrepared::alloc(
+            module, n, basek, k, rows, 1, rank_in, 1,
+        ))
+    }
+
+    pub fn bytes_of(module: &Module<B>, n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank_in: usize) -> usize
+    where
+        Module<B>: VmpPMatAllocBytes,
+    {
+        GGLWESwitchingKeyPrepared::<Vec<u8>, B>::bytes_of(module, n, basek, k, rows, digits, rank_in, 1)
+    }
+}
+
+impl<D: DataRef, B: Backend> PrepareAlloc<B, GLWEToLWESwitchingKeyPrepared<Vec<u8>, B>> for GLWEToLWESwitchingKey<D>
+where
+    Module<B>: VmpPrepare<B> + VmpPMatAlloc<B>,
+{
+    fn prepare_alloc(&self, module: &Module<B>, scratch: &mut Scratch<B>) -> GLWEToLWESwitchingKeyPrepared<Vec<u8>, B> {
+        let mut ksk_prepared: GLWEToLWESwitchingKeyPrepared<Vec<u8>, B> = GLWEToLWESwitchingKeyPrepared::alloc(
+            module,
+            self.0.n(),
+            self.0.basek(),
+            self.0.k(),
+            self.0.rows(),
+            self.0.rank_in(),
+        );
+        ksk_prepared.prepare(module, self, scratch);
+        ksk_prepared
+    }
+}
+
+impl<DM: DataMut, DR: DataRef, B: Backend> Prepare<B, GLWEToLWESwitchingKey<DR>> for GLWEToLWESwitchingKeyPrepared<DM, B>
+where
+    Module<B>: VmpPrepare<B>,
+{
+    fn prepare(&mut self, module: &Module<B>, other: &GLWEToLWESwitchingKey<DR>, scratch: &mut Scratch<B>) {
+        self.0.prepare(module, &other.0, scratch);
+    }
+}

poulpy-core/src/layouts/prepared/lwe_ksk.rs

@@ -0,0 +1,90 @@
+use poulpy_backend::hal::{
+    api::{VmpPMatAlloc, VmpPMatAllocBytes, VmpPrepare},
+    layouts::{Backend, Data, DataMut, DataRef, Module, Scratch, VmpPMat},
+};
+
+use crate::layouts::{
+    Infos, LWESwitchingKey,
+    prepared::{GGLWESwitchingKeyPrepared, Prepare, PrepareAlloc},
+};
+
+#[derive(PartialEq, Eq)]
+pub struct LWESwitchingKeyPrepared<D: Data, B: Backend>(pub(crate) GGLWESwitchingKeyPrepared<D, B>);
+
+impl<D: Data, B: Backend> Infos for LWESwitchingKeyPrepared<D, B> {
+    type Inner = VmpPMat<D, B>;
+
+    fn inner(&self) -> &Self::Inner {
+        self.0.inner()
+    }
+
+    fn basek(&self) -> usize {
+        self.0.basek()
+    }
+
+    fn k(&self) -> usize {
+        self.0.k()
+    }
+}
+
+impl<D: Data, B: Backend> LWESwitchingKeyPrepared<D, B> {
+    pub fn digits(&self) -> usize {
+        self.0.digits()
+    }
+
+    pub fn rank(&self) -> usize {
+        self.0.rank()
+    }
+
+    pub fn rank_in(&self) -> usize {
+        self.0.rank_in()
+    }
+
+    pub fn rank_out(&self) -> usize {
+        self.0.rank_out()
+    }
+}
+
+impl<B: Backend> LWESwitchingKeyPrepared<Vec<u8>, B> {
+    pub fn alloc(module: &Module<B>, n: usize, basek: usize, k: usize, rows: usize) -> Self
+    where
+        Module<B>: VmpPMatAlloc<B>,
+    {
+        Self(GGLWESwitchingKeyPrepared::alloc(
+            module, n, basek, k, rows, 1, 1, 1,
+        ))
+    }
+
+    pub fn bytes_of(module: &Module<B>, n: usize, basek: usize, k: usize, rows: usize, digits: usize) -> usize
+    where
+        Module<B>: VmpPMatAllocBytes,
+    {
+        GGLWESwitchingKeyPrepared::<Vec<u8>, B>::bytes_of(module, n, basek, k, rows, digits, 1, 1)
+    }
+}
+
+impl<D: DataRef, B: Backend> PrepareAlloc<B, LWESwitchingKeyPrepared<Vec<u8>, B>> for LWESwitchingKey<D>
+where
+    Module<B>: VmpPrepare<B> + VmpPMatAlloc<B>,
+{
+    fn prepare_alloc(&self, module: &Module<B>, scratch: &mut Scratch<B>) -> LWESwitchingKeyPrepared<Vec<u8>, B> {
+        let mut ksk_prepared: LWESwitchingKeyPrepared<Vec<u8>, B> = LWESwitchingKeyPrepared::alloc(
+            module,
+            self.0.n(),
+            self.0.basek(),
+            self.0.k(),
+            self.0.rows(),
+        );
+        ksk_prepared.prepare(module, self, scratch);
+        ksk_prepared
+    }
+}
+
+impl<DM: DataMut, DR: DataRef, B: Backend> Prepare<B, LWESwitchingKey<DR>> for LWESwitchingKeyPrepared<DM, B>
+where
+    Module<B>: VmpPrepare<B>,
+{
+    fn prepare(&mut self, module: &Module<B>, other: &LWESwitchingKey<DR>, scratch: &mut Scratch<B>) {
+        self.0.prepare(module, &other.0, scratch);
+    }
+}

poulpy-core/src/layouts/prepared/lwe_to_glwe_ksk.rs

@@ -0,0 +1,92 @@
+use poulpy_backend::hal::{
+    api::{VmpPMatAlloc, VmpPMatAllocBytes, VmpPrepare},
+    layouts::{Backend, Data, DataMut, DataRef, Module, Scratch, VmpPMat},
+};
+
+use crate::layouts::{
+    Infos, LWEToGLWESwitchingKey,
+    prepared::{GGLWESwitchingKeyPrepared, Prepare, PrepareAlloc},
+};
+
+/// A special [GLWESwitchingKey] required to for the conversion from [LWECiphertext] to [GLWECiphertext].
+#[derive(PartialEq, Eq)]
+pub struct LWEToGLWESwitchingKeyPrepared<D: Data, B: Backend>(pub(crate) GGLWESwitchingKeyPrepared<D, B>);
+
+impl<D: Data, B: Backend> Infos for LWEToGLWESwitchingKeyPrepared<D, B> {
+    type Inner = VmpPMat<D, B>;
+
+    fn inner(&self) -> &Self::Inner {
+        self.0.inner()
+    }
+
+    fn basek(&self) -> usize {
+        self.0.basek()
+    }
+
+    fn k(&self) -> usize {
+        self.0.k()
+    }
+}
+
+impl<D: Data, B: Backend> LWEToGLWESwitchingKeyPrepared<D, B> {
+    pub fn digits(&self) -> usize {
+        self.0.digits()
+    }
+
+    pub fn rank(&self) -> usize {
+        self.0.rank()
+    }
+
+    pub fn rank_in(&self) -> usize {
+        self.0.rank_in()
+    }
+
+    pub fn rank_out(&self) -> usize {
+        self.0.rank_out()
+    }
+}
+
+impl<B: Backend> LWEToGLWESwitchingKeyPrepared<Vec<u8>, B> {
+    pub fn alloc(module: &Module<B>, n: usize, basek: usize, k: usize, rows: usize, rank_out: usize) -> Self
+    where
+        Module<B>: VmpPMatAlloc<B>,
+    {
+        Self(GGLWESwitchingKeyPrepared::alloc(
+            module, n, basek, k, rows, 1, 1, rank_out,
+        ))
+    }
+
+    pub fn bytes_of(module: &Module<B>, n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank_out: usize) -> usize
+    where
+        Module<B>: VmpPMatAllocBytes,
+    {
+        GGLWESwitchingKeyPrepared::<Vec<u8>, B>::bytes_of(module, n, basek, k, rows, digits, 1, rank_out)
+    }
+}
+
+impl<D: DataRef, B: Backend> PrepareAlloc<B, LWEToGLWESwitchingKeyPrepared<Vec<u8>, B>> for LWEToGLWESwitchingKey<D>
+where
+    Module<B>: VmpPrepare<B> + VmpPMatAlloc<B>,
+{
+    fn prepare_alloc(&self, module: &Module<B>, scratch: &mut Scratch<B>) -> LWEToGLWESwitchingKeyPrepared<Vec<u8>, B> {
+        let mut ksk_prepared: LWEToGLWESwitchingKeyPrepared<Vec<u8>, B> = LWEToGLWESwitchingKeyPrepared::alloc(
+            module,
+            self.0.n(),
+            self.0.basek(),
+            self.0.k(),
+            self.0.rows(),
+            self.0.rank_out(),
+        );
+        ksk_prepared.prepare(module, self, scratch);
+        ksk_prepared
+    }
+}
+
+impl<DM: DataMut, DR: DataRef, B: Backend> Prepare<B, LWEToGLWESwitchingKey<DR>> for LWEToGLWESwitchingKeyPrepared<DM, B>
+where
+    Module<B>: VmpPrepare<B>,
+{
+    fn prepare(&mut self, module: &Module<B>, other: &LWEToGLWESwitchingKey<DR>, scratch: &mut Scratch<B>) {
+        self.0.prepare(module, &other.0, scratch);
+    }
+}

poulpy-core/src/layouts/prepared/mod.rs

@@ -0,0 +1,30 @@
+mod gglwe_atk;
+mod gglwe_ct;
+mod gglwe_ksk;
+mod gglwe_tsk;
+mod ggsw_ct;
+mod glwe_pk;
+mod glwe_sk;
+mod glwe_to_lwe_ksk;
+mod lwe_ksk;
+mod lwe_to_glwe_ksk;
+
+pub use gglwe_atk::*;
+pub use gglwe_ct::*;
+pub use gglwe_ksk::*;
+pub use gglwe_tsk::*;
+pub use ggsw_ct::*;
+pub use glwe_pk::*;
+pub use glwe_sk::*;
+pub use glwe_to_lwe_ksk::*;
+pub use lwe_ksk::*;
+pub use lwe_to_glwe_ksk::*;
+use poulpy_backend::hal::layouts::{Backend, Module, Scratch};
+
+pub trait PrepareAlloc<B: Backend, T> {
+    fn prepare_alloc(&self, module: &Module<B>, scratch: &mut Scratch<B>) -> T;
+}
+
+pub trait Prepare<B: Backend, T> {
+    fn prepare(&mut self, module: &Module<B>, other: &T, scratch: &mut Scratch<B>);
+}