From eaac9c07d8cd948c44b16668b9b8282ffe507d12 Mon Sep 17 00:00:00 2001
From: Pro7ech <jeanphilippe.bossuat@gmail.com>
Date: Sat, 25 Oct 2025 15:43:18 +0200
Subject: [PATCH] Add GLWETensor

---
 poulpy-core/src/layouts/glwe_tensor.rs | 146 +++++++++++++++++++++++++
 poulpy-core/src/layouts/mod.rs         |   2 +
 2 files changed, 148 insertions(+)
 create mode 100644 poulpy-core/src/layouts/glwe_tensor.rs

diff --git a/poulpy-core/src/layouts/glwe_tensor.rs b/poulpy-core/src/layouts/glwe_tensor.rs
new file mode 100644
index 0000000..516a854
--- /dev/null
+++ b/poulpy-core/src/layouts/glwe_tensor.rs
@@ -0,0 +1,146 @@
+use poulpy_hal::{
+    layouts::{Data, DataMut, DataRef, FillUniform, VecZnx, VecZnxToMut, VecZnxToRef, ZnxInfos},
+    source::Source,
+};
+
+use crate::layouts::{Base2K, Degree, GLWEInfos, LWEInfos, Rank, SetGLWEInfos, TorusPrecision};
+use std::fmt;
+
+#[derive(PartialEq, Eq, Clone)]
+pub struct GLWETensor<D: Data> {
+    pub(crate) data: VecZnx<D>,
+    pub(crate) base2k: Base2K,
+    pub(crate) rank: Rank,
+    pub(crate) k: TorusPrecision,
+}
+
+impl<D: DataMut> SetGLWEInfos for GLWETensor<D> {
+    fn set_base2k(&mut self, base2k: Base2K) {
+        self.base2k = base2k
+    }
+
+    fn set_k(&mut self, k: TorusPrecision) {
+        self.k = k
+    }
+}
+
+impl<D: DataRef> GLWETensor<D> {
+    pub fn data(&self) -> &VecZnx<D> {
+        &self.data
+    }
+}
+
+impl<D: DataMut> GLWETensor<D> {
+    pub fn data_mut(&mut self) -> &mut VecZnx<D> {
+        &mut self.data
+    }
+}
+
+impl<D: Data> LWEInfos for GLWETensor<D> {
+    fn base2k(&self) -> Base2K {
+        self.base2k
+    }
+
+    fn k(&self) -> TorusPrecision {
+        self.k
+    }
+
+    fn n(&self) -> Degree {
+        Degree(self.data.n() as u32)
+    }
+
+    fn size(&self) -> usize {
+        self.data.size()
+    }
+}
+
+impl<D: Data> GLWEInfos for GLWETensor<D> {
+    fn rank(&self) -> Rank {
+        self.rank
+    }
+}
+
+impl<D: DataRef> fmt::Debug for GLWETensor<D> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{self}")
+    }
+}
+
+impl<D: DataRef> fmt::Display for GLWETensor<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "GLWETensor: base2k={} k={}: {}",
+            self.base2k().0,
+            self.k().0,
+            self.data
+        )
+    }
+}
+
+impl<D: DataMut> FillUniform for GLWETensor<D> {
+    fn fill_uniform(&mut self, log_bound: usize, source: &mut Source) {
+        self.data.fill_uniform(log_bound, source);
+    }
+}
+
+impl GLWETensor<Vec<u8>> {
+    pub fn alloc_from_infos<A>(infos: &A) -> Self
+    where
+        A: GLWEInfos,
+    {
+        Self::alloc(infos.n(), infos.base2k(), infos.k(), infos.rank())
+    }
+
+    pub fn alloc(n: Degree, base2k: Base2K, k: TorusPrecision, rank: Rank) -> Self {
+        let pairs: usize = (((rank + 1) * rank).as_usize() >> 1).max(1) as usize;
+        GLWETensor {
+            data: VecZnx::alloc(n.into(), pairs + 1, k.0.div_ceil(base2k.0) as usize),
+            base2k,
+            k,
+            rank,
+        }
+    }
+
+    pub fn bytes_of_from_infos<A>(infos: &A) -> usize
+    where
+        A: GLWEInfos,
+    {
+        Self::bytes_of(infos.n(), infos.base2k(), infos.k(), infos.rank())
+    }
+
+    pub fn bytes_of(n: Degree, base2k: Base2K, k: TorusPrecision, rank: Rank) -> usize {
+        let pairs: usize = (((rank + 1) * rank).as_usize() >> 1).max(1) as usize;
+        VecZnx::bytes_of(n.into(), pairs + 1, k.0.div_ceil(base2k.0) as usize)
+    }
+}
+
+pub trait GLWETensorToRef {
+    fn to_ref(&self) -> GLWETensor<&[u8]>;
+}
+
+impl<D: DataRef> GLWETensorToRef for GLWETensor<D> {
+    fn to_ref(&self) -> GLWETensor<&[u8]> {
+        GLWETensor {
+            k: self.k,
+            base2k: self.base2k,
+            data: self.data.to_ref(),
+            rank: self.rank,
+        }
+    }
+}
+
+pub trait GLWETensorToMut {
+    fn to_mut(&mut self) -> GLWETensor<&mut [u8]>;
+}
+
+impl<D: DataMut> GLWETensorToMut for GLWETensor<D> {
+    fn to_mut(&mut self) -> GLWETensor<&mut [u8]> {
+        GLWETensor {
+            k: self.k,
+            base2k: self.base2k,
+            rank: self.rank,
+            data: self.data.to_mut(),
+        }
+    }
+}
diff --git a/poulpy-core/src/layouts/mod.rs b/poulpy-core/src/layouts/mod.rs
index 1168ac8..7c5cc5b 100644
--- a/poulpy-core/src/layouts/mod.rs
+++ b/poulpy-core/src/layouts/mod.rs
@@ -6,6 +6,7 @@ mod glwe_plaintext;
 mod glwe_public_key;
 mod glwe_secret;
 mod glwe_switching_key;
+mod glwe_tensor;
 mod glwe_tensor_key;
 mod glwe_to_lwe_switching_key;
 mod lwe;
@@ -26,6 +27,7 @@ pub use glwe_plaintext::*;
 pub use glwe_public_key::*;
 pub use glwe_secret::*;
 pub use glwe_switching_key::*;
+pub use glwe_tensor::*;
 pub use glwe_tensor_key::*;
 pub use glwe_to_lwe_switching_key::*;
 pub use lwe::*;