wip on BR + added enc/dec for LWE

backend/src/lib.rs

@@ -103,7 +103,7 @@ fn alloc_aligned_custom_u8(size: usize, align: usize) -> Vec<u8> {
 /// Size of T * size msut be a multiple of [DEFAULTALIGN].
 pub fn alloc_aligned_custom<T>(size: usize, align: usize) -> Vec<T> {
     assert_eq!(
-        (size * size_of::<T>()) % align,
+        (size * size_of::<T>()) % (align/ size_of::<T>()),
         0,
         "size={} must be a multiple of align={}",
         size,
@@ -121,7 +121,7 @@ pub fn alloc_aligned_custom<T>(size: usize, align: usize) -> Vec<T> {
 /// of [DEFAULTALIGN]/size_of::<T>() that is equal or greater to `size`.
 pub fn alloc_aligned<T>(size: usize) -> Vec<T> {
     alloc_aligned_custom::<T>(
-        size + (size % (DEFAULTALIGN / size_of::<T>())),
+        size + (DEFAULTALIGN - (size % (DEFAULTALIGN / size_of::<T>()))),
         DEFAULTALIGN,
     )
 }

backend/src/mat_znx_dft_ops.rs

@@ -82,6 +82,12 @@ pub trait MatZnxDftOps<BACKEND: Backend> {
     where
         A: MatZnxToMut<FFT64>;
 
+    /// Multiplies A by (X^{k} - 1).
+    fn mat_znx_dft_mul_x_pow_minus_one_add_inplace<R, A>(&self, k: i64, res: &mut R, a: &A, scratch: &mut Scratch)
+    where
+        R: MatZnxToMut<FFT64>,
+        A: MatZnxToRef<FFT64>;
+
     /// Applies the vector matrix product [VecZnxDft] x [MatZnxDft].
     /// The size of `buf` is given by [MatZnxDftOps::vmp_apply_dft_to_dft_tmp_bytes].
     ///
@@ -212,7 +218,7 @@ impl MatZnxDftOps<FFT64> for Module<FFT64> {
 
                 self.mat_znx_dft_set_row(&mut res, row_i, col_j, &tmp_1);
             });
-        })
+        });
     }
 
     fn mat_znx_dft_mul_x_pow_minus_one_inplace<A>(&self, k: i64, a: &mut A, scratch: &mut Scratch)
@@ -249,7 +255,52 @@ impl MatZnxDftOps<FFT64> for Module<FFT64> {
 
                 self.mat_znx_dft_set_row(&mut a, row_i, col_j, &tmp_1);
             });
-        })
+        });
+    }
+
+    fn mat_znx_dft_mul_x_pow_minus_one_add_inplace<R, A>(&self, k: i64, res: &mut R, a: &A, scratch: &mut Scratch)
+    where
+        R: MatZnxToMut<FFT64>,
+        A: MatZnxToRef<FFT64>,
+    {
+        let mut res: MatZnxDft<&mut [u8], FFT64> = res.to_mut();
+        let a: MatZnxDft<&[u8], FFT64> = a.to_ref();
+
+        #[cfg(debug_assertions)]
+        {
+            assert_eq!(a.n(), self.n());
+        }
+
+        let (mut xpm1_dft, scratch1) = scratch.tmp_scalar_znx_dft(self, 1);
+
+        {
+            let (mut xpm1, _) = scratch1.tmp_scalar_znx(self, 1);
+            xpm1.data[0] = 1;
+            self.vec_znx_rotate_inplace(k, &mut xpm1, 0);
+            self.svp_prepare(&mut xpm1_dft, 0, &xpm1, 0);
+        }
+
+        let (mut tmp_0, scratch2) = scratch1.tmp_vec_znx_dft(self, a.cols_out(), a.size());
+        let (mut tmp_1, _) = scratch2.tmp_vec_znx_dft(self, a.cols_out(), a.size());
+
+        (0..a.rows()).for_each(|row_i| {
+            (0..a.cols_in()).for_each(|col_j| {
+                self.mat_znx_dft_get_row(&mut tmp_0, &a, row_i, col_j);
+
+                (0..tmp_0.cols()).for_each(|i| {
+                    self.svp_apply(&mut tmp_1, i, &xpm1_dft, 0, &tmp_0, i);
+                    self.vec_znx_dft_sub_ab_inplace(&mut tmp_1, i, &tmp_0, i);
+                });
+
+                self.mat_znx_dft_get_row(&mut tmp_0, &res, row_i, col_j);
+
+                (0..tmp_0.cols()).for_each(|i| {
+                    self.vec_znx_dft_add_inplace(&mut tmp_0, i, &tmp_1, i);
+                });
+
+                self.mat_znx_dft_set_row(&mut res, row_i, col_j, &tmp_0);
+            });
+        });
     }
 
     fn mat_znx_dft_set_row<R, A>(&self, res: &mut R, res_row: usize, res_col_in: usize, a: &A)
@@ -845,7 +896,6 @@ mod tests {
 
                 (0..cols_out).for_each(|j| {
                     module.vec_znx_idft(&mut tmp_big, 0, &tmp_dft, j, scratch.borrow());
-                    // module.vec_znx_big_normalize(basek, &mut want, j, &tmp_big, 0, scratch.borrow());
                     module.vec_znx_big_normalize(basek, &mut tmp, 0, &tmp_big, 0, scratch.borrow());
                     module.vec_znx_rotate(k, &mut want, j, &tmp, 0);
                     module.vec_znx_sub_ab_inplace(&mut want, j, &tmp, 0);
@@ -863,4 +913,84 @@ mod tests {
             });
         });
     }
+
+    #[test]
+    fn mat_znx_dft_mul_x_pow_minus_one_add_inplace() {
+        let log_n: i32 = 5;
+        let n: usize = 1 << log_n;
+
+        let module: Module<FFT64> = Module::<FFT64>::new(n);
+        let basek: usize = 8;
+        let rows: usize = 2;
+        let cols_in: usize = 2;
+        let cols_out: usize = 2;
+        let size: usize = 4;
+
+        let mut scratch: ScratchOwned = ScratchOwned::new(module.mat_znx_dft_mul_x_pow_minus_one_scratch_space(size, cols_out));
+
+        let mut mat_want: MatZnxDft<Vec<u8>, FFT64> = module.new_mat_znx_dft(rows, cols_in, cols_out, size);
+        let mut mat_have: MatZnxDft<Vec<u8>, FFT64> = module.new_mat_znx_dft(rows, cols_in, cols_out, size);
+
+        let mut tmp: VecZnx<Vec<u8>> = module.new_vec_znx(1, size);
+        let mut tmp_dft: VecZnxDft<Vec<u8>, FFT64> = module.new_vec_znx_dft(cols_out, size);
+
+        let mut source: Source = Source::new([0u8; 32]);
+
+        (0..mat_have.rows()).for_each(|row_i| {
+            (0..mat_have.cols_in()).for_each(|col_i| {
+                (0..cols_out).for_each(|j| {
+                    tmp.fill_uniform(basek, 0, size, &mut source);
+                    module.vec_znx_dft(1, 0, &mut tmp_dft, j, &tmp, 0);
+                });
+
+                module.mat_znx_dft_set_row(&mut mat_have, row_i, col_i, &tmp_dft);
+            });
+        });
+
+        (0..mat_want.rows()).for_each(|row_i| {
+            (0..mat_want.cols_in()).for_each(|col_i| {
+                (0..cols_out).for_each(|j| {
+                    tmp.fill_uniform(basek, 0, size, &mut source);
+                    module.vec_znx_dft(1, 0, &mut tmp_dft, j, &tmp, 0);
+                });
+
+                module.mat_znx_dft_set_row(&mut mat_want, row_i, col_i, &tmp_dft);
+            });
+        });
+
+        let k: i64 = 1;
+
+        module.mat_znx_dft_mul_x_pow_minus_one_add_inplace(k, &mut mat_have, &mat_want, scratch.borrow());
+
+        let mut have: VecZnx<Vec<u8>> = module.new_vec_znx(cols_out, size);
+        let mut want: VecZnx<Vec<u8>> = module.new_vec_znx(cols_out, size);
+        let mut tmp_big: VecZnxBig<Vec<u8>, FFT64> = module.new_vec_znx_big(1, size);
+
+        let mut source: Source = Source::new([0u8; 32]);
+        (0..mat_want.rows()).for_each(|row_i| {
+            (0..mat_want.cols_in()).for_each(|col_i| {
+                module.mat_znx_dft_get_row(&mut tmp_dft, &mat_want, row_i, col_i);
+
+                (0..cols_out).for_each(|j| {
+                    module.vec_znx_idft(&mut tmp_big, 0, &tmp_dft, j, scratch.borrow());
+                    module.vec_znx_big_normalize(basek, &mut tmp, 0, &tmp_big, 0, scratch.borrow());
+                    module.vec_znx_rotate(k, &mut want, j, &tmp, 0);
+                    module.vec_znx_sub_ab_inplace(&mut want, j, &tmp, 0);
+
+                    tmp.fill_uniform(basek, 0, size, &mut source);
+                    module.vec_znx_add_inplace(&mut want, j, &tmp, 0);
+                    module.vec_znx_normalize_inplace(basek, &mut want, j, scratch.borrow());
+                });
+
+                module.mat_znx_dft_get_row(&mut tmp_dft, &mat_have, row_i, col_i);
+
+                (0..cols_out).for_each(|j| {
+                    module.vec_znx_idft(&mut tmp_big, 0, &tmp_dft, j, scratch.borrow());
+                    module.vec_znx_big_normalize(basek, &mut have, j, &tmp_big, 0, scratch.borrow());
+                });
+
+                assert_eq!(have, want)
+            });
+        });
+    }
 }

backend/src/scalar_znx.rs

@@ -91,9 +91,9 @@ impl<D: AsMut<[u8]> + AsRef<[u8]>> ScalarZnx<D> {
     }
 
     pub fn fill_binary_block(&mut self, col: usize, block_size: usize, source: &mut Source) {
-        assert!(block_size & (block_size - 1) == 0);
+        assert!(self.n() % block_size == 0);
         let max_idx: u64 = (block_size + 1) as u64;
-        let mask_idx: u64 = (2 * block_size - 1) as u64;
+        let mask_idx: u64 = (1<<((u64::BITS - max_idx.leading_zeros())as u64)) - 1 ;
         for block in self.at_mut(col, 0).chunks_mut(block_size) {
             let idx: usize = source.next_u64n(max_idx, mask_idx) as usize;
             if idx != block_size {

backend/src/vec_znx.rs

@@ -177,7 +177,7 @@ impl<D: From<Vec<u8>>> VecZnx<D> {
         n * cols * size * size_of::<Scalar>()
     }
 
-    pub(crate) fn new<Scalar: Sized>(n: usize, cols: usize, size: usize) -> Self {
+    pub fn new<Scalar: Sized>(n: usize, cols: usize, size: usize) -> Self {
         let data = alloc_aligned::<u8>(Self::bytes_of::<Scalar>(n, cols, size));
         Self {
             data: data.into(),
@@ -243,7 +243,13 @@ fn normalize_tmp_bytes(n: usize) -> usize {
     n * std::mem::size_of::<i64>()
 }
 
-#[allow(dead_code)]
+impl<D: AsRef<[u8]> + AsMut<[u8]>> VecZnx<D>{
+    pub fn normalize(&mut self, basek: usize, a_col: usize, tmp_bytes: &mut [u8]){
+        normalize(basek, self, a_col, tmp_bytes);
+    }
+}
+
+
 fn normalize<D: AsMut<[u8]> + AsRef<[u8]>>(basek: usize, a: &mut VecZnx<D>, a_col: usize, tmp_bytes: &mut [u8]) {
     let n: usize = a.n();
 

core/benches/external_product_glwe_fft64.rs

@@ -26,7 +26,7 @@ fn bench_external_product_glwe_fft64(c: &mut Criterion) {
         let rank: usize = p.rank;
         let digits: usize = 1;
 
-        let rows: usize = (p.k_ct_in + p.basek - 1) / p.basek;
+        let rows: usize = 1; //(p.k_ct_in + p.basek - 1) / p.basek;
         let sigma: f64 = 3.2;
 
         let mut ct_ggsw: GGSWCiphertext<Vec<u8>, FFT64> = GGSWCiphertext::alloc(&module, basek, k_ggsw, rows, digits, rank);
@@ -81,11 +81,11 @@ fn bench_external_product_glwe_fft64(c: &mut Criterion) {
     }
 
     let params_set: Vec<Params> = vec![Params {
-        log_n: 10,
+        log_n: 11,
-        basek: 7,
+        basek: 22,
-        k_ct_in: 27,
+        k_ct_in: 44,
-        k_ct_out: 27,
+        k_ct_out: 44,
-        k_ggsw: 27,
+        k_ggsw: 54,
         rank: 1,
     }];
 

core/src/blind_rotation/ccgi.rs

@@ -0,0 +1,139 @@
+use std::time::Instant;
+
+use backend::{MatZnxDftOps, MatZnxDftScratch, Module, ScalarZnxDftOps, Scratch, VecZnxDftOps, VecZnxOps, ZnxView, ZnxViewMut, ZnxZero, FFT64};
+use itertools::izip;
+
+use crate::{
+    GGSWCiphertext, GLWECiphertext, GLWECiphertextToMut, GLWECiphertextToRef, GLWEPlaintext, Infos, LWECiphertext,
+    ScratchCore, blind_rotation::key::BlindRotationKeyCGGI, lwe::ciphertext::LWECiphertextToRef,
+};
+
+pub fn cggi_blind_rotate_scratch_space(
+    module: &Module<FFT64>,
+    basek: usize,
+    k_lut: usize,
+    k_brk: usize,
+    rows: usize,
+    rank: usize,
+) -> usize {
+    let size = k_brk.div_ceil(basek);
+    GGSWCiphertext::<Vec<u8>, FFT64>::bytes_of(module, basek, k_brk, rows, 1, rank)
+        + (module.mat_znx_dft_mul_x_pow_minus_one_scratch_space(size, rank + 1)
+            | GLWECiphertext::external_product_inplace_scratch_space(module, basek, k_lut, k_brk, 1, rank))
+}
+
+pub fn cggi_blind_rotate<DataRes, DataIn, DataLUT>(
+    module: &Module<FFT64>,
+    res: &mut GLWECiphertext<DataRes>,
+    lwe: &LWECiphertext<DataIn>,
+    lut: &GLWEPlaintext<DataLUT>,
+    brk: &BlindRotationKeyCGGI<FFT64>,
+    scratch: &mut Scratch,
+) where
+    DataRes: AsRef<[u8]> + AsMut<[u8]>,
+    DataIn: AsRef<[u8]>,
+    DataLUT: AsRef<[u8]>,
+{
+
+    println!("{}", lwe.n());
+
+    let mut lwe_2n: Vec<i64> = vec![0i64; lwe.n() + 1]; // TODO: from scratch space
+    let mut out_mut: GLWECiphertext<&mut [u8]> = res.to_mut();
+    let lwe_ref: LWECiphertext<&[u8]> = lwe.to_ref();
+    let lut_ref: GLWECiphertext<&[u8]> = lut.to_ref();
+
+    let cols = out_mut.rank()+1;
+
+    mod_switch_2n(module, &mut lwe_2n, &lwe_ref);
+
+    let a: &[i64] = &lwe_2n[1..];
+    let b: i64 = lwe_2n[0];
+
+    out_mut.data.zero();
+
+    // Initialize out to X^{b} * LUT(X)
+    module.vec_znx_rotate(b, &mut out_mut.data, 0, &lut_ref.data, 0);
+
+    let block_size: usize = brk.block_size();
+
+    // ACC + [sum DFT(X^ai -1) * (DFT(ACC) x BRKi)]
+
+    let (mut acc_dft, scratch1) = scratch.tmp_glwe_fourier(module, brk.basek(), out_mut.k(), out_mut.rank());
+    let (mut acc_add_dft, scratch2) = scratch1.tmp_glwe_fourier(module, brk.basek(), out_mut.k(), out_mut.rank());
+    let (mut vmp_res, scratch3) = scratch2.tmp_vec_znx_dft(module, acc_dft.rank()+1, acc_dft.size());
+    let (mut xai_minus_one, scratch4) = scratch3.tmp_scalar_znx(module, 1);
+    let (mut xai_minus_one_dft, scratch5) = scratch4.tmp_scalar_znx_dft(module, 1);
+
+    let start: Instant = Instant::now();
+    izip!(
+        a.chunks_exact(block_size),
+        brk.data.chunks_exact(block_size)
+    )
+    .for_each(|(ai, ski)| {
+
+        out_mut.dft(module, &mut acc_dft);
+        acc_add_dft.data.zero();
+        
+        izip!(ai.iter(), ski.iter())
+            .enumerate()
+            .for_each(|(i, (aii, skii))| {
+
+                // vmp_res = DFT(acc) * BRK[i]
+                module.vmp_apply(&mut vmp_res, &acc_dft.data, &skii.data, scratch5);
+
+                // DFT(X^ai -1)
+                xai_minus_one.zero();
+                xai_minus_one.at_mut(0, 0)[0] = 1;
+                module.vec_znx_rotate_inplace(*aii, &mut xai_minus_one, 0);
+                xai_minus_one.at_mut(0, 0)[0] -= 1;
+                module.svp_prepare(&mut xai_minus_one_dft, 0, &xai_minus_one, 0);
+
+                // DFT(X^ai -1) * (DFT(acc) * BRK[i])
+                (0..cols).for_each(|i|{
+                    module.svp_apply_inplace(&mut vmp_res, i, &xai_minus_one_dft, 0);
+                    module.vec_znx_dft_add_inplace(&mut acc_add_dft.data, i, &vmp_res, i);
+                });
+            
+            });
+        
+        acc_add_dft.idft(module, &mut out_mut, scratch5);
+    });
+    let duration: std::time::Duration = start.elapsed();
+    println!("external products: {} us", duration.as_micros());
+}
+
+fn mod_switch_2n(module: &Module<FFT64>, res: &mut [i64], lwe: &LWECiphertext<&[u8]>) {
+    let basek: usize = lwe.basek();
+
+    let log2n: usize = module.log_n() + 1;
+
+    res.copy_from_slice(&lwe.data.at(0, 0));
+
+    if basek > log2n {
+        let diff: usize = basek - log2n;
+        res.iter_mut().for_each(|x| {
+            *x = div_signed_by_pow2(x, diff);
+        })
+    } else {
+        let rem: usize = basek - (log2n % basek);
+        let size: usize = log2n.div_ceil(basek);
+        (1..size).for_each(|i| {
+            if i == size - 1 && rem != basek {
+                let k_rem: usize = basek - rem;
+                izip!(lwe.data.at(0, i).iter(), res.iter_mut()).for_each(|(x, y)| {
+                    *y = (*y << k_rem) + (x >> rem);
+                });
+            } else {
+                izip!(lwe.data.at(0, i).iter(), res.iter_mut()).for_each(|(x, y)| {
+                    *y = (*y << basek) + x;
+                });
+            }
+        })
+    }
+}
+
+#[inline(always)]
+fn div_signed_by_pow2(x: &i64, k: usize) -> i64 {
+    let bias: i64 = (1 << k) - 1;
+    (x + ((x >> 63) & bias)) >> k
+}

core/src/blind_rotation/key.rs

@@ -1,22 +1,22 @@
 use backend::{Backend, FFT64, Module, ScalarZnx, ScalarZnxAlloc, ScalarZnxToRef, Scratch, ZnxView, ZnxViewMut};
 use sampling::source::Source;
 
-use crate::{Distribution, FourierGLWESecret, GGSWCiphertext, GLWEAutomorphismKey, LWESecret};
+use crate::{Distribution, FourierGLWESecret, GGSWCiphertext, Infos, LWESecret};
 
 pub struct BlindRotationKeyCGGI<B: Backend> {
     pub(crate) data: Vec<GGSWCiphertext<Vec<u8>, B>>,
     pub(crate) dist: Distribution,
 }
 
-pub struct BlindRotationKeyFHEW<B: Backend> {
+// pub struct BlindRotationKeyFHEW<B: Backend> {
-    pub(crate) data: Vec<GGSWCiphertext<Vec<u8>, B>>,
+//    pub(crate) data: Vec<GGSWCiphertext<Vec<u8>, B>>,
-    pub(crate) auto: Vec<GLWEAutomorphismKey<Vec<u8>, B>>,
+//    pub(crate) auto: Vec<GLWEAutomorphismKey<Vec<u8>, B>>,
-}
+//}
 
 impl BlindRotationKeyCGGI<FFT64> {
-    pub fn allocate(module: &Module<FFT64>, lwe_degree: usize, basek: usize, k: usize, rows: usize, rank: usize) -> Self {
+    pub fn allocate(module: &Module<FFT64>, n_lwe: usize, basek: usize, k: usize, rows: usize, rank: usize) -> Self {
-        let mut data: Vec<GGSWCiphertext<Vec<u8>, FFT64>> = Vec::with_capacity(lwe_degree);
+        let mut data: Vec<GGSWCiphertext<Vec<u8>, FFT64>> = Vec::with_capacity(n_lwe);
-        (0..lwe_degree).for_each(|_| data.push(GGSWCiphertext::alloc(module, basek, k, rows, 1, rank)));
+        (0..n_lwe).for_each(|_| data.push(GGSWCiphertext::alloc(module, basek, k, rows, 1, rank)));
         Self {
             data,
             dist: Distribution::NONE,
@@ -61,4 +61,27 @@ impl BlindRotationKeyCGGI<FFT64> {
             ggsw.encrypt_sk(module, &pt, sk_glwe, source_xa, source_xe, sigma, scratch);
         })
     }
+
+    pub(crate) fn block_size(&self) -> usize {
+        match self.dist {
+            Distribution::BinaryBlock(value) => value,
+            _ => 1,
+        }
+    }
+
+    pub(crate) fn rows(&self) -> usize {
+        self.data[0].rows()
+    }
+
+    pub(crate) fn k(&self) -> usize {
+        self.data[0].k()
+    }
+
+    pub(crate) fn rank(&self) -> usize {
+        self.data[0].rank()
+    }
+
+    pub(crate) fn basek(&self) -> usize {
+        self.data[0].basek()
+    }
 }

core/src/blind_rotation/mod.rs

@@ -1,2 +1,6 @@
 // pub mod cggi;
+pub mod ccgi;
 pub mod key;
+
+#[cfg(test)]
+pub mod test_fft64;

core/src/blind_rotation/test_fft64/cggi.rs

@@ -0,0 +1,85 @@
+use core::time;
+use std::time::Instant;
+
+use backend::{Encoding, Module, ScratchOwned, FFT64};
+use sampling::source::Source;
+
+use crate::{
+    blind_rotation::{ccgi::{cggi_blind_rotate, cggi_blind_rotate_scratch_space}, key::BlindRotationKeyCGGI}, lwe::LWEPlaintext, FourierGLWESecret, GLWECiphertext, GLWEPlaintext, GLWESecret, LWECiphertext, LWESecret
+};
+
+#[test]
+fn blind_rotation() {
+    let module: Module<FFT64> = Module::<FFT64>::new(2048);
+    let basek: usize = 17;
+
+    let n_lwe: usize = 1071;
+
+    let k_lwe: usize = 22;
+    let k_brk: usize = 54;
+    let rows_brk: usize = 1;
+    let k_lut: usize = 44;
+    let rank: usize = 1;
+    let block_size: usize = 7;
+
+    let mut source_xs: Source = Source::new([0u8; 32]);
+    let mut source_xe: Source = Source::new([0u8; 32]);
+    let mut source_xa: Source = Source::new([0u8; 32]);
+
+    let mut sk_glwe: GLWESecret<Vec<u8>> = GLWESecret::alloc(&module, rank);
+    sk_glwe.fill_ternary_prob(0.5, &mut source_xs);
+    let sk_glwe_dft: FourierGLWESecret<Vec<u8>, FFT64> = FourierGLWESecret::from(&module, &sk_glwe);
+
+    let mut sk_lwe: LWESecret<Vec<u8>> = LWESecret::alloc(n_lwe);
+    sk_lwe.fill_binary_block(block_size, &mut source_xs);
+
+    let mut scratch: ScratchOwned = ScratchOwned::new(BlindRotationKeyCGGI::generate_from_sk_scratch_space(
+        &module, basek, k_brk, rank,
+    ) | cggi_blind_rotate_scratch_space(&module, basek, k_lut, k_brk, rows_brk, rank));
+
+    let start: Instant = Instant::now();
+    let mut brk: BlindRotationKeyCGGI<FFT64> = BlindRotationKeyCGGI::allocate(&module, n_lwe, basek, k_brk, rows_brk, rank);
+    brk.generate_from_sk(
+        &module,
+        &sk_glwe_dft,
+        &sk_lwe,
+        &mut source_xa,
+        &mut source_xe,
+        3.2,
+        scratch.borrow(),
+    );
+    let duration: std::time::Duration = start.elapsed();
+    println!("brk-gen: {} ms", duration.as_millis());
+
+    let mut lwe: LWECiphertext<Vec<u8>> = LWECiphertext::alloc(n_lwe, basek, k_lwe);
+
+    let mut pt_lwe: LWEPlaintext<Vec<u8>> = LWEPlaintext::alloc(basek, k_lwe);
+
+    pt_lwe.data.encode_coeff_i64(0, basek, 7, 0, 63, 7);
+
+    println!("{}", pt_lwe.data);
+
+    lwe.encrypt_sk(&pt_lwe, &sk_lwe, &mut source_xa, &mut source_xe, 3.2);
+
+    lwe.decrypt(&mut pt_lwe, &sk_lwe);
+
+    println!("{}", pt_lwe.data);
+
+    let lut: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::alloc(&module, basek, k_lut);
+
+    let mut res: GLWECiphertext<Vec<u8>> = GLWECiphertext::alloc(&module, basek, k_lut, rank);
+
+    let start: Instant = Instant::now();
+    (0..32).for_each(|i|{
+        cggi_blind_rotate(&module, &mut res, &lwe, &lut, &brk, scratch.borrow());
+    });
+    
+    let duration: std::time::Duration = start.elapsed();
+    println!("blind-rotate: {} ms", duration.as_millis());
+
+    let mut pt: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::alloc(&module, basek, k_lut);
+
+    res.decrypt(&module , &mut pt, &sk_glwe_dft, scratch.borrow());
+
+    println!("{}", pt.data);
+}

core/src/blind_rotation/test_fft64/mod.rs

@@ -0,0 +1 @@
+pub mod cggi;

core/src/elem.rs

@@ -1,6 +1,6 @@
 use backend::{Backend, Module, ZnxInfos};
 
-use crate::{FourierGLWECiphertext, div_ceil};
+use crate::FourierGLWECiphertext;
 
 pub trait Infos {
     type Inner: ZnxInfos;

core/src/fourier_glwe.rs

@@ -1,321 +0,0 @@
-use backend::{
-    Backend, FFT64, MatZnxDftOps, MatZnxDftScratch, Module, ScalarZnxDftOps, Scratch, VecZnxAlloc, VecZnxBig, VecZnxBigAlloc,
-    VecZnxBigOps, VecZnxBigScratch, VecZnxDft, VecZnxDftAlloc, VecZnxDftOps, ZnxZero,
-};
-use sampling::source::Source;
-
-use crate::{GGSWCiphertext, GLWECiphertext, GLWEPlaintext, GLWESecret, GLWESwitchingKey, Infos, ScratchCore};
-
-pub struct FourierGLWECiphertext<C, B: Backend> {
-    pub data: VecZnxDft<C, B>,
-    pub basek: usize,
-    pub k: usize,
-}
-
-impl<B: Backend> FourierGLWECiphertext<Vec<u8>, B> {
-    pub fn alloc(module: &Module<B>, basek: usize, k: usize, rank: usize) -> Self {
-        Self {
-            data: module.new_vec_znx_dft(rank + 1, k.div_ceil(basek)),
-            basek: basek,
-            k: k,
-        }
-    }
-
-    pub fn bytes_of(module: &Module<B>, basek: usize, k: usize, rank: usize) -> usize {
-        module.bytes_of_vec_znx_dft(rank + 1, k.div_ceil(basek))
-    }
-}
-
-impl<T, B: Backend> Infos for FourierGLWECiphertext<T, B> {
-    type Inner = VecZnxDft<T, B>;
-
-    fn inner(&self) -> &Self::Inner {
-        &self.data
-    }
-
-    fn basek(&self) -> usize {
-        self.basek
-    }
-
-    fn k(&self) -> usize {
-        self.k
-    }
-}
-
-impl<T, B: Backend> FourierGLWECiphertext<T, B> {
-    pub fn rank(&self) -> usize {
-        self.cols() - 1
-    }
-}
-
-impl FourierGLWECiphertext<Vec<u8>, FFT64> {
-    #[allow(dead_code)]
-    pub(crate) fn idft_scratch_space(module: &Module<FFT64>, basek: usize, k: usize) -> usize {
-        module.bytes_of_vec_znx(1, k.div_ceil(basek))
-            + (module.vec_znx_big_normalize_tmp_bytes() | module.vec_znx_idft_tmp_bytes())
-    }
-
-    pub fn encrypt_sk_scratch_space(module: &Module<FFT64>, basek: usize, k: usize, rank: usize) -> usize {
-        module.bytes_of_vec_znx(rank + 1, k.div_ceil(basek)) + GLWECiphertext::encrypt_sk_scratch_space(module, basek, k)
-    }
-
-    pub fn decrypt_scratch_space(module: &Module<FFT64>, basek: usize, k: usize) -> usize {
-        let size: usize = k.div_ceil(basek);
-        (module.vec_znx_big_normalize_tmp_bytes()
-            | module.bytes_of_vec_znx_dft(1, size)
-            | (module.bytes_of_vec_znx_big(1, size) + module.vec_znx_idft_tmp_bytes()))
-            + module.bytes_of_vec_znx_big(1, size)
-    }
-
-    pub fn keyswitch_scratch_space(
-        module: &Module<FFT64>,
-        basek: usize,
-        k_out: usize,
-        k_in: usize,
-        k_ksk: usize,
-        digits: usize,
-        rank_in: usize,
-        rank_out: usize,
-    ) -> usize {
-        GLWECiphertext::bytes_of(module, basek, k_out, rank_out)
-            + GLWECiphertext::keyswitch_from_fourier_scratch_space(module, basek, k_out, k_in, k_ksk, digits, rank_in, rank_out)
-    }
-
-    pub fn keyswitch_inplace_scratch_space(
-        module: &Module<FFT64>,
-        basek: usize,
-        k_out: usize,
-        k_ksk: usize,
-        digits: usize,
-        rank: usize,
-    ) -> usize {
-        Self::keyswitch_scratch_space(module, basek, k_out, k_out, k_ksk, digits, rank, rank)
-    }
-
-    // WARNING TODO: UPDATE
-    pub fn external_product_scratch_space(
-        module: &Module<FFT64>,
-        basek: usize,
-        _k_out: usize,
-        k_in: usize,
-        k_ggsw: usize,
-        digits: usize,
-        rank: usize,
-    ) -> usize {
-        let ggsw_size: usize = k_ggsw.div_ceil(basek);
-        let res_dft: usize = module.bytes_of_vec_znx_dft(rank + 1, ggsw_size);
-        let in_size: usize = k_in.div_ceil(basek).div_ceil(digits);
-        let ggsw_size: usize = k_ggsw.div_ceil(basek);
-        let vmp: usize = module.bytes_of_vec_znx_dft(rank + 1, in_size)
-            + module.vmp_apply_tmp_bytes(ggsw_size, in_size, in_size, rank + 1, rank + 1, ggsw_size);
-        let res_small: usize = module.bytes_of_vec_znx(rank + 1, ggsw_size);
-        let normalize: usize = module.vec_znx_big_normalize_tmp_bytes();
-        res_dft + (vmp | (res_small + normalize))
-    }
-
-    pub fn external_product_inplace_scratch_space(
-        module: &Module<FFT64>,
-        basek: usize,
-        k_out: usize,
-        k_ggsw: usize,
-        digits: usize,
-        rank: usize,
-    ) -> usize {
-        Self::external_product_scratch_space(module, basek, k_out, k_out, k_ggsw, digits, rank)
-    }
-}
-
-impl<DataSelf: AsMut<[u8]> + AsRef<[u8]>> FourierGLWECiphertext<DataSelf, FFT64> {
-    pub fn encrypt_zero_sk<DataSk: AsRef<[u8]>>(
-        &mut self,
-        module: &Module<FFT64>,
-        sk: &GLWESecret<DataSk, FFT64>,
-        source_xa: &mut Source,
-        source_xe: &mut Source,
-        sigma: f64,
-        scratch: &mut Scratch,
-    ) {
-        let (mut tmp_ct, scratch1) = scratch.tmp_glwe_ct(module, self.basek(), self.k(), self.rank());
-        tmp_ct.encrypt_zero_sk(module, sk, source_xa, source_xe, sigma, scratch1);
-        tmp_ct.dft(module, self);
-    }
-
-    pub fn keyswitch<DataLhs: AsRef<[u8]>, DataRhs: AsRef<[u8]>>(
-        &mut self,
-        module: &Module<FFT64>,
-        lhs: &FourierGLWECiphertext<DataLhs, FFT64>,
-        rhs: &GLWESwitchingKey<DataRhs, FFT64>,
-        scratch: &mut Scratch,
-    ) {
-        let (mut tmp_ct, scratch1) = scratch.tmp_glwe_ct(module, self.basek(), self.k(), self.rank());
-        tmp_ct.keyswitch_from_fourier(module, lhs, rhs, scratch1);
-        tmp_ct.dft(module, self);
-    }
-
-    pub fn keyswitch_inplace<DataRhs: AsRef<[u8]>>(
-        &mut self,
-        module: &Module<FFT64>,
-        rhs: &GLWESwitchingKey<DataRhs, FFT64>,
-        scratch: &mut Scratch,
-    ) {
-        unsafe {
-            let self_ptr: *mut FourierGLWECiphertext<DataSelf, FFT64> = self as *mut FourierGLWECiphertext<DataSelf, FFT64>;
-            self.keyswitch(&module, &*self_ptr, rhs, scratch);
-        }
-    }
-
-    pub fn external_product<DataLhs: AsRef<[u8]>, DataRhs: AsRef<[u8]>>(
-        &mut self,
-        module: &Module<FFT64>,
-        lhs: &FourierGLWECiphertext<DataLhs, FFT64>,
-        rhs: &GGSWCiphertext<DataRhs, FFT64>,
-        scratch: &mut Scratch,
-    ) {
-        let basek: usize = self.basek();
-
-        #[cfg(debug_assertions)]
-        {
-            assert_eq!(rhs.rank(), lhs.rank());
-            assert_eq!(rhs.rank(), self.rank());
-            assert_eq!(self.basek(), basek);
-            assert_eq!(lhs.basek(), basek);
-            assert_eq!(rhs.n(), module.n());
-            assert_eq!(self.n(), module.n());
-            assert_eq!(lhs.n(), module.n());
-            assert!(
-                scratch.available()
-                    >= FourierGLWECiphertext::external_product_scratch_space(
-                        module,
-                        self.basek(),
-                        self.k(),
-                        lhs.k(),
-                        rhs.k(),
-                        rhs.digits(),
-                        rhs.rank(),
-                    )
-            );
-        }
-
-        let cols: usize = rhs.rank() + 1;
-        let digits = rhs.digits();
-
-        // Space for VMP result in DFT domain and high precision
-        let (mut res_dft, scratch1) = scratch.tmp_vec_znx_dft(module, cols, rhs.size());
-        let (mut a_dft, scratch2) = scratch1.tmp_vec_znx_dft(module, cols, (lhs.size() + digits - 1) / digits);
-
-        {
-            (0..digits).for_each(|di| {
-                a_dft.set_size((lhs.size() + di) / digits);
-
-                // Small optimization for digits > 2
-                // VMP produce some error e, and since we aggregate vmp * 2^{di * B}, then
-                // we also aggregate ei * 2^{di * B}, with the largest error being ei * 2^{(digits-1) * B}.
-                // As such we can ignore the last digits-2 limbs safely of the sum of vmp products.
-                // It is possible to further ignore the last digits-1 limbs, but this introduce
-                // ~0.5 to 1 bit of additional noise, and thus not chosen here to ensure that the same
-                // noise is kept with respect to the ideal functionality.
-                res_dft.set_size(rhs.size() - ((digits - di) as isize - 2).max(0) as usize);
-
-                (0..cols).for_each(|col_i| {
-                    module.vec_znx_dft_copy(digits, digits - 1 - di, &mut a_dft, col_i, &lhs.data, col_i);
-                });
-
-                if di == 0 {
-                    module.vmp_apply(&mut res_dft, &a_dft, &rhs.data, scratch2);
-                } else {
-                    module.vmp_apply_add(&mut res_dft, &a_dft, &rhs.data, di, scratch2);
-                }
-            });
-        }
-
-        // VMP result in high precision
-        let res_big: VecZnxBig<&mut [u8], FFT64> = module.vec_znx_idft_consume::<&mut [u8]>(res_dft);
-
-        // Space for VMP result normalized
-        let (mut res_small, scratch2) = scratch1.tmp_vec_znx(module, cols, rhs.size());
-        (0..cols).for_each(|i| {
-            module.vec_znx_big_normalize(basek, &mut res_small, i, &res_big, i, scratch2);
-            module.vec_znx_dft(1, 0, &mut self.data, i, &res_small, i);
-        });
-    }
-
-    pub fn external_product_inplace<DataRhs: AsRef<[u8]>>(
-        &mut self,
-        module: &Module<FFT64>,
-        rhs: &GGSWCiphertext<DataRhs, FFT64>,
-        scratch: &mut Scratch,
-    ) {
-        unsafe {
-            let self_ptr: *mut FourierGLWECiphertext<DataSelf, FFT64> = self as *mut FourierGLWECiphertext<DataSelf, FFT64>;
-            self.external_product(&module, &*self_ptr, rhs, scratch);
-        }
-    }
-}
-
-impl<DataSelf: AsRef<[u8]>> FourierGLWECiphertext<DataSelf, FFT64> {
-    pub fn decrypt<DataPt: AsRef<[u8]> + AsMut<[u8]>, DataSk: AsRef<[u8]>>(
-        &self,
-        module: &Module<FFT64>,
-        pt: &mut GLWEPlaintext<DataPt>,
-        sk: &GLWESecret<DataSk, FFT64>,
-        scratch: &mut Scratch,
-    ) {
-        #[cfg(debug_assertions)]
-        {
-            assert_eq!(self.rank(), sk.rank());
-            assert_eq!(self.n(), module.n());
-            assert_eq!(pt.n(), module.n());
-            assert_eq!(sk.n(), module.n());
-        }
-
-        let cols = self.rank() + 1;
-
-        let (mut pt_big, scratch_1) = scratch.tmp_vec_znx_big(module, 1, self.size()); // TODO optimize size when pt << ct
-        pt_big.zero();
-
-        {
-            (1..cols).for_each(|i| {
-                let (mut ci_dft, _) = scratch_1.tmp_vec_znx_dft(module, 1, self.size()); // TODO optimize size when pt << ct
-                module.svp_apply(&mut ci_dft, 0, &sk.data_fourier, i - 1, &self.data, i);
-                let ci_big: VecZnxBig<&mut [u8], FFT64> = module.vec_znx_idft_consume(ci_dft);
-                module.vec_znx_big_add_inplace(&mut pt_big, 0, &ci_big, 0);
-            });
-        }
-
-        {
-            let (mut c0_big, scratch_2) = scratch_1.tmp_vec_znx_big(module, 1, self.size());
-            // c0_big = (a * s) + (-a * s + m + e) = BIG(m + e)
-            module.vec_znx_idft(&mut c0_big, 0, &self.data, 0, scratch_2);
-            module.vec_znx_big_add_inplace(&mut pt_big, 0, &c0_big, 0);
-        }
-
-        // pt = norm(BIG(m + e))
-        module.vec_znx_big_normalize(self.basek(), &mut pt.data, 0, &mut pt_big, 0, scratch_1);
-
-        pt.basek = self.basek();
-        pt.k = pt.k().min(self.k());
-    }
-
-    #[allow(dead_code)]
-    pub(crate) fn idft<DataRes: AsRef<[u8]> + AsMut<[u8]>>(
-        &self,
-        module: &Module<FFT64>,
-        res: &mut GLWECiphertext<DataRes>,
-        scratch: &mut Scratch,
-    ) {
-        #[cfg(debug_assertions)]
-        {
-            assert_eq!(self.rank(), res.rank());
-            assert_eq!(self.basek(), res.basek())
-        }
-
-        let min_size: usize = self.size().min(res.size());
-
-        let (mut res_big, scratch1) = scratch.tmp_vec_znx_big(module, 1, min_size);
-
-        (0..self.rank() + 1).for_each(|i| {
-            module.vec_znx_idft(&mut res_big, 0, &self.data, i, scratch1);
-            module.vec_znx_big_normalize(self.basek(), &mut res.data, i, &res_big, 0, scratch1);
-        });
-    }
-}

core/src/fourier_glwe/ciphertext.rs

@@ -1,6 +1,6 @@
 use backend::{Backend, Module, VecZnxDft, VecZnxDftAlloc};
 
-use crate::{Infos, div_ceil};
+use crate::Infos;
 
 pub struct FourierGLWECiphertext<C, B: Backend> {
     pub data: VecZnxDft<C, B>,
@@ -11,14 +11,14 @@ pub struct FourierGLWECiphertext<C, B: Backend> {
 impl<B: Backend> FourierGLWECiphertext<Vec<u8>, B> {
     pub fn alloc(module: &Module<B>, basek: usize, k: usize, rank: usize) -> Self {
         Self {
-            data: module.new_vec_znx_dft(rank + 1, div_ceil(k, basek)),
+            data: module.new_vec_znx_dft(rank + 1, k.div_ceil(basek)),
             basek: basek,
             k: k,
         }
     }
 
     pub fn bytes_of(module: &Module<B>, basek: usize, k: usize, rank: usize) -> usize {
-        module.bytes_of_vec_znx_dft(rank + 1, div_ceil(k, basek))
+        module.bytes_of_vec_znx_dft(rank + 1, k.div_ceil(basek))
     }
 }
 

core/src/fourier_glwe/decryption.rs

@@ -3,11 +3,11 @@ use backend::{
     VecZnxDftOps, ZnxZero,
 };
 
-use crate::{FourierGLWECiphertext, FourierGLWESecret, GLWECiphertext, GLWEPlaintext, Infos, div_ceil};
+use crate::{FourierGLWECiphertext, FourierGLWESecret, GLWECiphertext, GLWEPlaintext, Infos};
 
 impl FourierGLWECiphertext<Vec<u8>, FFT64> {
     pub fn decrypt_scratch_space(module: &Module<FFT64>, basek: usize, k: usize) -> usize {
-        let size: usize = div_ceil(k, basek);
+        let size: usize = k.div_ceil(basek);
         (module.vec_znx_big_normalize_tmp_bytes()
             | module.bytes_of_vec_znx_dft(1, size)
             | (module.bytes_of_vec_znx_big(1, size) + module.vec_znx_idft_tmp_bytes()))

core/src/fourier_glwe/encryption.rs

@@ -1,17 +1,17 @@
 use backend::{FFT64, Module, Scratch, VecZnxAlloc, VecZnxBigScratch, VecZnxDftOps};
 use sampling::source::Source;
 
-use crate::{FourierGLWECiphertext, FourierGLWESecret, GLWECiphertext, Infos, ScratchCore, div_ceil};
+use crate::{FourierGLWECiphertext, FourierGLWESecret, GLWECiphertext, Infos, ScratchCore};
 
 impl FourierGLWECiphertext<Vec<u8>, FFT64> {
     #[allow(dead_code)]
     pub(crate) fn idft_scratch_space(module: &Module<FFT64>, basek: usize, k: usize) -> usize {
-        module.bytes_of_vec_znx(1, div_ceil(k, basek))
+        module.bytes_of_vec_znx(1, k.div_ceil(basek))
             + (module.vec_znx_big_normalize_tmp_bytes() | module.vec_znx_idft_tmp_bytes())
     }
 
     pub fn encrypt_sk_scratch_space(module: &Module<FFT64>, basek: usize, k: usize, rank: usize) -> usize {
-        module.bytes_of_vec_znx(rank + 1, div_ceil(k, basek)) + GLWECiphertext::encrypt_sk_scratch_space(module, basek, k)
+        module.bytes_of_vec_znx(rank + 1, k.div_ceil(basek)) + GLWECiphertext::encrypt_sk_scratch_space(module, basek, k)
     }
 }
 

core/src/fourier_glwe/external_product.rs

@@ -3,7 +3,7 @@ use backend::{
     VecZnxDftAlloc, VecZnxDftOps,
 };
 
-use crate::{FourierGLWECiphertext, GGSWCiphertext, Infos, div_ceil};
+use crate::{FourierGLWECiphertext, GGSWCiphertext, Infos};
 
 impl FourierGLWECiphertext<Vec<u8>, FFT64> {
     // WARNING TODO: UPDATE
@@ -16,10 +16,10 @@ impl FourierGLWECiphertext<Vec<u8>, FFT64> {
         digits: usize,
         rank: usize,
     ) -> usize {
-        let ggsw_size: usize = div_ceil(k_ggsw, basek);
+        let ggsw_size: usize = k_ggsw.div_ceil(basek);
         let res_dft: usize = module.bytes_of_vec_znx_dft(rank + 1, ggsw_size);
-        let in_size: usize = div_ceil(div_ceil(k_in, basek), digits);
+        let in_size: usize = k_in.div_ceil(basek).div_ceil(digits);
-        let ggsw_size: usize = div_ceil(k_ggsw, basek);
+        let ggsw_size: usize = k_ggsw.div_ceil(basek);
         let vmp: usize = module.bytes_of_vec_znx_dft(rank + 1, in_size)
             + module.vmp_apply_tmp_bytes(ggsw_size, in_size, in_size, rank + 1, rank + 1, ggsw_size);
         let res_small: usize = module.bytes_of_vec_znx(rank + 1, ggsw_size);

core/src/fourier_glwe/test_fft64/external_product.rs

@@ -1,6 +1,6 @@
 use crate::{
     FourierGLWECiphertext, FourierGLWESecret, GGSWCiphertext, GLWECiphertext, GLWEOps, GLWEPlaintext, GLWESecret, Infos,
-    div_ceil, noise::noise_ggsw_product,
+    noise::noise_ggsw_product,
 };
 use backend::{FFT64, FillUniform, Module, ScalarZnx, ScalarZnxAlloc, ScratchOwned, Stats, VecZnxOps, ZnxViewMut};
 use sampling::source::Source;
@@ -10,7 +10,7 @@ fn apply() {
     let log_n: usize = 8;
     let basek: usize = 12;
     let k_in: usize = 45;
-    let digits: usize = div_ceil(k_in, basek);
+    let digits: usize = k_in.div_ceil(basek);
     (1..4).for_each(|rank| {
         (1..digits + 1).for_each(|di| {
             let k_ggsw: usize = k_in + basek * di;
@@ -26,7 +26,7 @@ fn apply_inplace() {
     let log_n: usize = 8;
     let basek: usize = 12;
     let k_ct: usize = 60;
-    let digits: usize = div_ceil(k_ct, basek);
+    let digits: usize = k_ct.div_ceil(basek);
     (1..4).for_each(|rank| {
         (1..digits + 1).for_each(|di| {
             let k_ggsw: usize = k_ct + basek * di;
@@ -39,7 +39,7 @@ fn apply_inplace() {
 fn test_apply(log_n: usize, basek: usize, k_out: usize, k_in: usize, k_ggsw: usize, digits: usize, rank: usize, sigma: f64) {
     let module: Module<FFT64> = Module::<FFT64>::new(1 << log_n);
 
-    let rows: usize = div_ceil(k_in, digits * basek);
+    let rows: usize = k_in.div_ceil(digits * basek);
 
     let mut ct_ggsw: GGSWCiphertext<Vec<u8>, FFT64> = GGSWCiphertext::alloc(&module, basek, k_ggsw, rows, digits, rank);
     let mut ct_in: GLWECiphertext<Vec<u8>> = GLWECiphertext::alloc(&module, basek, k_in, rank);
@@ -147,7 +147,7 @@ fn test_apply(log_n: usize, basek: usize, k_out: usize, k_in: usize, k_ggsw: usi
 
 fn test_apply_inplace(log_n: usize, basek: usize, k_ct: usize, k_ggsw: usize, digits: usize, rank: usize, sigma: f64) {
     let module: Module<FFT64> = Module::<FFT64>::new(1 << log_n);
-    let rows: usize = div_ceil(k_ct, digits * basek);
+    let rows: usize = k_ct.div_ceil(digits * basek);
 
     let mut ct_ggsw: GGSWCiphertext<Vec<u8>, FFT64> = GGSWCiphertext::alloc(&module, basek, k_ggsw, rows, digits, rank);
     let mut ct: GLWECiphertext<Vec<u8>> = GLWECiphertext::alloc(&module, basek, k_ct, rank);

core/src/fourier_glwe/test_fft64/keyswitch.rs

@@ -1,5 +1,5 @@
 use crate::{
-    FourierGLWECiphertext, FourierGLWESecret, GLWECiphertext, GLWEPlaintext, GLWESecret, GLWESwitchingKey, Infos, div_ceil,
+    FourierGLWECiphertext, FourierGLWESecret, GLWECiphertext, GLWEPlaintext, GLWESecret, GLWESwitchingKey, Infos,
     noise::log2_std_noise_gglwe_product,
 };
 use backend::{FFT64, FillUniform, Module, ScratchOwned, Stats, VecZnxOps};
@@ -10,7 +10,7 @@ fn apply() {
     let log_n: usize = 8;
     let basek: usize = 12;
     let k_in: usize = 45;
-    let digits: usize = div_ceil(k_in, basek);
+    let digits: usize = k_in.div_ceil(basek);
     (1..4).for_each(|rank_in| {
         (1..4).for_each(|rank_out| {
             (1..digits + 1).for_each(|di| {
@@ -31,7 +31,7 @@ fn apply_inplace() {
     let log_n: usize = 8;
     let basek: usize = 12;
     let k_ct: usize = 45;
-    let digits: usize = div_ceil(k_ct, basek);
+    let digits: usize = k_ct.div_ceil(basek);
     (1..4).for_each(|rank| {
         (1..digits + 1).for_each(|di| {
             let k_ksk: usize = k_ct + basek * di;
@@ -54,7 +54,7 @@ fn test_apply(
 ) {
     let module: Module<FFT64> = Module::<FFT64>::new(1 << log_n);
 
-    let rows: usize = div_ceil(k_in, basek * digits);
+    let rows: usize = k_in.div_ceil(basek * digits);
 
     let mut ksk: GLWESwitchingKey<Vec<u8>, FFT64> =
         GLWESwitchingKey::alloc(&module, basek, k_ksk, rows, digits, rank_in, rank_out);
@@ -152,7 +152,7 @@ fn test_apply(
 fn test_apply_inplace(log_n: usize, basek: usize, k_ct: usize, k_ksk: usize, digits: usize, rank: usize, sigma: f64) {
     let module: Module<FFT64> = Module::<FFT64>::new(1 << log_n);
 
-    let rows: usize = div_ceil(k_ct, basek * digits);
+    let rows: usize = k_ct.div_ceil(basek * digits);
 
     let mut ksk: GLWESwitchingKey<Vec<u8>, FFT64> = GLWESwitchingKey::alloc(&module, basek, k_ksk, rows, digits, rank, rank);
     let mut ct_glwe: GLWECiphertext<Vec<u8>> = GLWECiphertext::alloc(&module, basek, k_ct, rank);

core/src/gglwe.rs

@@ -1,236 +0,0 @@
-use backend::{
-    Backend, FFT64, MatZnxDft, MatZnxDftAlloc, MatZnxDftOps, Module, ScalarZnx, Scratch, VecZnxAlloc, VecZnxDftAlloc, VecZnxOps,
-    ZnxInfos, ZnxZero,
-};
-use sampling::source::Source;
-
-use crate::{FourierGLWECiphertext, GLWECiphertext, GLWESecret, GetRow, Infos, ScratchCore, SetRow, div_ceil};
-
-pub struct GGLWECiphertext<C, B: Backend> {
-    pub(crate) data: MatZnxDft<C, B>,
-    pub(crate) basek: usize,
-    pub(crate) k: usize,
-    pub(crate) digits: usize,
-}
-
-impl<B: Backend> GGLWECiphertext<Vec<u8>, B> {
-    pub fn alloc(
-        module: &Module<B>,
-        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
-        );
-
-        debug_assert!(
-            rows * digits <= size,
-            "invalid gglwe: rows: {} * digits:{} > ceil(k/basek): {}",
-            rows,
-            digits,
-            size
-        );
-
-        Self {
-            data: module.new_mat_znx_dft(rows, rank_in, rank_out + 1, size),
-            basek: basek,
-            k,
-            digits,
-        }
-    }
-
-    pub fn bytes_of(
-        module: &Module<FFT64>,
-        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
-        );
-
-        module.bytes_of_mat_znx_dft(rows, rank_in, rank_out + 1, size)
-    }
-}
-
-impl<T, B: Backend> Infos for GGLWECiphertext<T, B> {
-    type Inner = MatZnxDft<T, B>;
-
-    fn inner(&self) -> &Self::Inner {
-        &self.data
-    }
-
-    fn basek(&self) -> usize {
-        self.basek
-    }
-
-    fn k(&self) -> usize {
-        self.k
-    }
-}
-
-impl<T, B: Backend> GGLWECiphertext<T, 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 GGLWECiphertext<Vec<u8>, FFT64> {
-    pub fn generate_from_sk_scratch_space(module: &Module<FFT64>, basek: usize, k: usize, rank: usize) -> usize {
-        let size = k.div_ceil(basek);
-        GLWECiphertext::encrypt_sk_scratch_space(module, basek, k)
-            + module.bytes_of_vec_znx(rank + 1, size)
-            + module.bytes_of_vec_znx(1, size)
-            + module.bytes_of_vec_znx_dft(rank + 1, size)
-    }
-
-    pub fn generate_from_pk_scratch_space(_module: &Module<FFT64>, _basek: usize, _k: usize, _rank: usize) -> usize {
-        unimplemented!()
-    }
-}
-
-impl<DataSelf: AsMut<[u8]> + AsRef<[u8]>> GGLWECiphertext<DataSelf, FFT64> {
-    pub fn encrypt_sk<DataPt: AsRef<[u8]>, DataSk: AsRef<[u8]>>(
-        &mut self,
-        module: &Module<FFT64>,
-        pt: &ScalarZnx<DataPt>,
-        sk: &GLWESecret<DataSk, FFT64>,
-        source_xa: &mut Source,
-        source_xe: &mut Source,
-        sigma: f64,
-        scratch: &mut Scratch,
-    ) {
-        #[cfg(debug_assertions)]
-        {
-            assert_eq!(self.rank_in(), pt.cols());
-            assert_eq!(self.rank_out(), sk.rank());
-            assert_eq!(self.n(), module.n());
-            assert_eq!(sk.n(), module.n());
-            assert_eq!(pt.n(), module.n());
-            assert!(
-                scratch.available()
-                    >= GGLWECiphertext::generate_from_sk_scratch_space(module, self.basek(), self.k(), self.rank()),
-                "scratch.available: {} < GGLWECiphertext::generate_from_sk_scratch_space(module, self.rank()={}, \
-                 self.size()={}): {}",
-                scratch.available(),
-                self.rank(),
-                self.size(),
-                GGLWECiphertext::generate_from_sk_scratch_space(module, self.basek(), self.k(), self.rank())
-            );
-            assert!(
-                self.rows() * self.digits() * self.basek() <= self.k(),
-                "self.rows() : {} * self.digits() : {} * self.basek() : {} = {} >= self.k() = {}",
-                self.rows(),
-                self.digits(),
-                self.basek(),
-                self.rows() * self.digits() * self.basek(),
-                self.k()
-            );
-        }
-
-        let rows: usize = self.rows();
-        let digits: usize = self.digits();
-        let basek: usize = self.basek();
-        let k: usize = self.k();
-        let rank_in: usize = self.rank_in();
-        let rank_out: usize = self.rank_out();
-
-        let (mut tmp_pt, scrach_1) = scratch.tmp_glwe_pt(module, basek, k);
-        let (mut tmp_ct, scrach_2) = scrach_1.tmp_glwe_ct(module, basek, k, rank_out);
-        let (mut tmp_ct_dft, scratch_3) = scrach_2.tmp_glwe_fourier(module, basek, k, rank_out);
-
-        // For each input column (i.e. rank) produces a GGLWE ciphertext of rank_out+1 columns
-        //
-        // Example for ksk rank 2 to rank 3:
-        //
-        // (-(a0*s0 + a1*s1 + a2*s2) + s0', a0, a1, a2)
-        // (-(b0*s0 + b1*s1 + b2*s2) + s0', b0, b1, b2)
-        //
-        // Example ksk rank 2 to rank 1
-        //
-        // (-(a*s) + s0, a)
-        // (-(b*s) + s1, b)
-        (0..rank_in).for_each(|col_i| {
-            (0..rows).for_each(|row_i| {
-                // Adds the scalar_znx_pt to the i-th limb of the vec_znx_pt
-                tmp_pt.data.zero(); // zeroes for next iteration
-                module.vec_znx_add_scalar_inplace(
-                    &mut tmp_pt.data,
-                    0,
-                    (digits - 1) + row_i * digits,
-                    pt,
-                    col_i,
-                );
-                module.vec_znx_normalize_inplace(basek, &mut tmp_pt.data, 0, scratch_3);
-
-                // rlwe encrypt of vec_znx_pt into vec_znx_ct
-                tmp_ct.encrypt_sk(module, &tmp_pt, sk, source_xa, source_xe, sigma, scratch_3);
-
-                // Switch vec_znx_ct into DFT domain
-                tmp_ct.dft(module, &mut tmp_ct_dft);
-
-                // Stores vec_znx_dft_ct into thw i-th row of the MatZnxDft
-                self.set_row(module, row_i, col_i, &tmp_ct_dft);
-            });
-        });
-    }
-}
-
-impl<C: AsRef<[u8]>> GetRow<FFT64> for GGLWECiphertext<C, FFT64> {
-    fn get_row<R: AsMut<[u8]> + AsRef<[u8]>>(
-        &self,
-        module: &Module<FFT64>,
-        row_i: usize,
-        col_j: usize,
-        res: &mut FourierGLWECiphertext<R, FFT64>,
-    ) {
-        module.mat_znx_dft_get_row(&mut res.data, &self.data, row_i, col_j);
-    }
-}
-
-impl<C: AsMut<[u8]> + AsRef<[u8]>> SetRow<FFT64> for GGLWECiphertext<C, FFT64> {
-    fn set_row<R: AsRef<[u8]>>(
-        &mut self,
-        module: &Module<FFT64>,
-        row_i: usize,
-        col_j: usize,
-        a: &FourierGLWECiphertext<R, FFT64>,
-    ) {
-        module.mat_znx_dft_set_row(&mut self.data, row_i, col_j, &a.data);
-    }
-}

core/src/gglwe/automorphism.rs

@@ -62,24 +62,33 @@ impl<DataSelf: AsMut<[u8]> + AsRef<[u8]>> GLWEAutomorphismKey<DataSelf, FFT64> {
                 self.rank_out(),
                 rhs.rank_out()
             );
+            assert!(
+                self.k() <= lhs.k(),
+                "output k={} cannot be greater than input k={}",
+                self.k(),
+                lhs.k()
+            )
         }
 
         let cols_out: usize = rhs.rank_out() + 1;
 
-        let (mut tmp_dft, scratch1) = scratch.tmp_glwe_fourier(module, lhs.basek(), lhs.k(), lhs.rank());
-
         (0..self.rank_in()).for_each(|col_i| {
             (0..self.rows()).for_each(|row_j| {
-                // Extracts relevant row
+                let (mut tmp_idft_data, scratct1) = scratch.tmp_vec_znx_big(module, cols_out, self.size());
-                lhs.get_row(module, row_j, col_i, &mut tmp_dft);
 
-                // Get a VecZnxBig from scratch space
+                {
-                let (mut tmp_idft_data, scratch2) = scratch1.tmp_vec_znx_big(module, cols_out, self.size());
+                    let (mut tmp_dft, scratch2) = scratct1.tmp_glwe_fourier(module, lhs.basek(), lhs.k(), lhs.rank());
 
-                // Switches input outside of DFT
+                    // Extracts relevant row
-                (0..cols_out).for_each(|i| {
+                    lhs.get_row(module, row_j, col_i, &mut tmp_dft);
-                    module.vec_znx_idft(&mut tmp_idft_data, i, &tmp_dft.data, i, scratch2);
+
-                });
+                    // Get a VecZnxBig from scratch space
+
+                    // Switches input outside of DFT
+                    (0..cols_out).for_each(|i| {
+                        module.vec_znx_idft(&mut tmp_idft_data, i, &tmp_dft.data, i, scratch2);
+                    });
+                }
 
                 // Consumes to small vec znx
                 let mut tmp_idft_small_data: VecZnx<&mut [u8]> = tmp_idft_data.to_vec_znx_small();
@@ -97,20 +106,25 @@ impl<DataSelf: AsMut<[u8]> + AsRef<[u8]>> GLWEAutomorphismKey<DataSelf, FFT64> {
                 };
 
                 // Key-switch (-sa + pi_{k}(s), a) to (-pi^{-1}_{k'}(s)a + pi_{k}(s), a)
-                tmp_idft.keyswitch_inplace(module, &rhs.key, scratch2);
+                tmp_idft.keyswitch_inplace(module, &rhs.key, scratct1);
 
-                // Applies back the automorphism X^{k}: (-pi^{-1}_{k'}(s)a + pi_{k}(s), a) -> (-pi^{-1}_{k'+k}(s)a + s, a)
+                {
-                // and switches back to DFT domain
+                    let (mut tmp_dft, _) = scratct1.tmp_glwe_fourier(module, self.basek(), self.k(), self.rank());
-                (0..self.rank_out() + 1).for_each(|i| {
-                    module.vec_znx_automorphism_inplace(lhs.p(), &mut tmp_idft.data, i);
-                    module.vec_znx_dft(1, 0, &mut tmp_dft.data, i, &tmp_idft.data, i);
-                });
 
-                // Sets back the relevant row
+                    // Applies back the automorphism X^{k}: (-pi^{-1}_{k'}(s)a + pi_{k}(s), a) -> (-pi^{-1}_{k'+k}(s)a + s, a)
-                self.set_row(module, row_j, col_i, &tmp_dft);
+                    // and switches back to DFT domain
+                    (0..self.rank_out() + 1).for_each(|i| {
+                        module.vec_znx_automorphism_inplace(lhs.p(), &mut tmp_idft.data, i);
+                        module.vec_znx_dft(1, 0, &mut tmp_dft.data, i, &tmp_idft.data, i);
+                    });
+
+                    // Sets back the relevant row
+                    self.set_row(module, row_j, col_i, &tmp_dft);
+                }
             });
         });
 
+        let (mut tmp_dft, _) = scratch.tmp_glwe_fourier(module, self.basek(), self.k(), self.rank());
         tmp_dft.data.zero();
 
         (self.rows().min(lhs.rows())..self.rows()).for_each(|row_i| {

core/src/gglwe/ciphertext.rs

@@ -1,6 +1,6 @@
 use backend::{Backend, FFT64, MatZnxDft, MatZnxDftAlloc, MatZnxDftOps, Module};
 
-use crate::{FourierGLWECiphertext, GetRow, Infos, SetRow, div_ceil};
+use crate::{FourierGLWECiphertext, GetRow, Infos, SetRow};
 
 pub struct GGLWECiphertext<C, B: Backend> {
     pub(crate) data: MatZnxDft<C, B>,
@@ -19,7 +19,7 @@ impl<B: Backend> GGLWECiphertext<Vec<u8>, B> {
         rank_in: usize,
         rank_out: usize,
     ) -> Self {
-        let size: usize = div_ceil(k, basek);
+        let size: usize = k.div_ceil(basek);
         debug_assert!(
             size > digits,
             "invalid gglwe: ceil(k/basek): {} <= digits: {}",
@@ -52,7 +52,7 @@ impl<B: Backend> GGLWECiphertext<Vec<u8>, B> {
         rank_in: usize,
         rank_out: usize,
     ) -> usize {
-        let size: usize = div_ceil(k, basek);
+        let size: usize = k.div_ceil(basek);
         debug_assert!(
             size > digits,
             "invalid gglwe: ceil(k/basek): {} <= digits: {}",

core/src/gglwe/encryption.rs

@@ -5,12 +5,12 @@ use sampling::source::Source;
 
 use crate::{
     FourierGLWESecret, GGLWECiphertext, GLWEAutomorphismKey, GLWECiphertext, GLWESecret, GLWESwitchingKey, GLWETensorKey, Infos,
-    ScratchCore, SetRow, div_ceil,
+    ScratchCore, SetRow,
 };
 
 impl GGLWECiphertext<Vec<u8>, FFT64> {
     pub fn generate_from_sk_scratch_space(module: &Module<FFT64>, basek: usize, k: usize, rank: usize) -> usize {
-        let size = div_ceil(k, basek);
+        let size = k.div_ceil(basek);
         GLWECiphertext::encrypt_sk_scratch_space(module, basek, k)
             + module.bytes_of_vec_znx(rank + 1, size)
             + module.bytes_of_vec_znx(1, size)

core/src/gglwe/test_fft64/automorphism_key.rs

@@ -2,7 +2,7 @@ use backend::{FFT64, Module, ScalarZnxOps, ScratchOwned, Stats, VecZnxOps};
 use sampling::source::Source;
 
 use crate::{
-    FourierGLWECiphertext, FourierGLWESecret, GLWEAutomorphismKey, GLWEPlaintext, GLWESecret, GetRow, Infos, div_ceil,
+    FourierGLWECiphertext, FourierGLWESecret, GLWEAutomorphismKey, GLWEPlaintext, GLWESecret, GetRow, Infos,
     noise::log2_std_noise_gglwe_product,
 };
 

core/src/gglwe/test_fft64/gglwe.rs

@@ -3,7 +3,6 @@ use sampling::source::Source;
 
 use crate::{
     FourierGLWECiphertext, FourierGLWESecret, GGSWCiphertext, GLWEPlaintext, GLWESecret, GLWESwitchingKey, GetRow, Infos,
-    div_ceil,
     noise::{log2_std_noise_gglwe_product, noise_ggsw_product},
 };
 

core/src/ggsw/ciphertext.rs

@@ -7,7 +7,7 @@ use sampling::source::Source;
 
 use crate::{
     FourierGLWECiphertext, FourierGLWESecret, GLWEAutomorphismKey, GLWECiphertext, GLWESwitchingKey, GLWETensorKey, GetRow,
-    Infos, ScratchCore, SetRow, div_ceil,
+    Infos, ScratchCore, SetRow,
 };
 
 pub struct GGSWCiphertext<C, B: Backend> {
@@ -17,8 +17,8 @@ pub struct GGSWCiphertext<C, B: Backend> {
     pub(crate) digits: usize,
 }
 
-impl<B: Backend> GGSWCiphertext<Vec<u8>, B> {
+impl GGSWCiphertext<Vec<u8>, FFT64> {
-    pub fn alloc(module: &Module<B>, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> Self {
+    pub fn alloc(module: &Module<FFT64>, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> Self {
         let size: usize = k.div_ceil(basek);
         debug_assert!(
             size > digits,

core/src/ggsw/test_fft64/ggsw.rs

@@ -6,7 +6,7 @@ use sampling::source::Source;
 
 use crate::{
     FourierGLWECiphertext, FourierGLWESecret, GGSWCiphertext, GLWEAutomorphismKey, GLWEPlaintext, GLWESecret, GLWESwitchingKey,
-    GLWETensorKey, GetRow, Infos, div_ceil,
+    GLWETensorKey, GetRow, Infos,
     noise::{noise_ggsw_keyswitch, noise_ggsw_product},
 };
 

core/src/glwe/ciphertext.rs

@@ -1,9 +1,6 @@
-use backend::{
+use backend::{Backend, FFT64, Module, VecZnx, VecZnxAlloc, VecZnxDftOps, VecZnxToMut, VecZnxToRef};
-    Backend, FFT64, Module, VecZnx, VecZnxAlloc, VecZnxBigAlloc, VecZnxBigScratch, VecZnxDftAlloc, VecZnxDftOps, VecZnxToMut,
-    VecZnxToRef,
-};
 
-use crate::{FourierGLWECiphertext, GLWEOps, Infos, SetMetaData, div_ceil};
+use crate::{FourierGLWECiphertext, GLWEOps, Infos, SetMetaData};
 
 pub struct GLWECiphertext<C> {
     pub data: VecZnx<C>,
@@ -14,14 +11,14 @@ pub struct GLWECiphertext<C> {
 impl GLWECiphertext<Vec<u8>> {
     pub fn alloc<B: Backend>(module: &Module<B>, basek: usize, k: usize, rank: usize) -> Self {
         Self {
-            data: module.new_vec_znx(rank + 1, div_ceil(k, basek)),
+            data: module.new_vec_znx(rank + 1, k.div_ceil(basek)),
             basek,
             k,
         }
     }
 
     pub fn bytes_of(module: &Module<FFT64>, basek: usize, k: usize, rank: usize) -> usize {
-        module.bytes_of_vec_znx(rank + 1, div_ceil(k, basek))
+        module.bytes_of_vec_znx(rank + 1, k.div_ceil(basek))
     }
 }
 
@@ -62,10 +59,13 @@ impl<C: AsRef<[u8]>> GLWECiphertext<C> {
     }
 }
 
-impl GLWECiphertext<Vec<u8>> {
+impl<DataSelf: AsRef<[u8]>> GLWECiphertext<DataSelf> {
-    pub fn decrypt_scratch_space(module: &Module<FFT64>, basek: usize, k: usize) -> usize {
+    pub fn clone(&self) -> GLWECiphertext<Vec<u8>> {
-        let size: usize = div_ceil(k, basek);
+        GLWECiphertext {
-        (module.vec_znx_big_normalize_tmp_bytes() | module.bytes_of_vec_znx_dft(1, size)) + module.bytes_of_vec_znx_big(1, size)
+            data: self.data.clone(),
+            basek: self.basek(),
+            k: self.k(),
+        }
     }
 }
 

core/src/glwe/decryption.rs

@@ -1,16 +1,18 @@
-use backend::{FFT64, Module, ScalarZnxDftOps, Scratch, VecZnxBigOps, VecZnxDftOps, ZnxZero};
+use backend::{
+    FFT64, Module, ScalarZnxDftOps, Scratch, VecZnxBigAlloc, VecZnxBigOps, VecZnxBigScratch, VecZnxDftAlloc, VecZnxDftOps,
+    ZnxZero,
+};
 
 use crate::{FourierGLWESecret, GLWECiphertext, GLWEPlaintext, Infos};
 
-impl<DataSelf: AsRef<[u8]>> GLWECiphertext<DataSelf> {
+impl GLWECiphertext<Vec<u8>> {
-    pub fn clone(&self) -> GLWECiphertext<Vec<u8>> {
+    pub fn decrypt_scratch_space(module: &Module<FFT64>, basek: usize, k: usize) -> usize {
-        GLWECiphertext {
+        let size: usize = k.div_ceil(basek);
-            data: self.data.clone(),
+        (module.vec_znx_big_normalize_tmp_bytes() | module.bytes_of_vec_znx_dft(1, size)) + module.bytes_of_vec_znx_big(1, size)
-            basek: self.basek(),
-            k: self.k(),
-        }
     }
+}
 
+impl<DataSelf: AsRef<[u8]>> GLWECiphertext<DataSelf> {
     pub fn decrypt<DataPt: AsMut<[u8]> + AsRef<[u8]>, DataSk: AsRef<[u8]>>(
         &self,
         module: &Module<FFT64>,

core/src/glwe/encryption.rs

@@ -4,15 +4,15 @@ use backend::{
 };
 use sampling::source::Source;
 
-use crate::{FourierGLWESecret, GLWECiphertext, GLWEPlaintext, GLWEPublicKey, Infos, SIX_SIGMA, dist::Distribution, div_ceil};
+use crate::{FourierGLWESecret, GLWECiphertext, GLWEPlaintext, GLWEPublicKey, Infos, SIX_SIGMA, dist::Distribution};
 
 impl GLWECiphertext<Vec<u8>> {
     pub fn encrypt_sk_scratch_space(module: &Module<FFT64>, basek: usize, k: usize) -> usize {
-        let size: usize = div_ceil(k, basek);
+        let size: usize = k.div_ceil(basek);
         module.vec_znx_big_normalize_tmp_bytes() + module.bytes_of_vec_znx_dft(1, size) + module.bytes_of_vec_znx(1, size)
     }
     pub fn encrypt_pk_scratch_space(module: &Module<FFT64>, basek: usize, k: usize) -> usize {
-        let size: usize = div_ceil(k, basek);
+        let size: usize = k.div_ceil(basek);
         ((module.bytes_of_vec_znx_dft(1, size) + module.bytes_of_vec_znx_big(1, size)) | module.bytes_of_scalar_znx(1))
             + module.bytes_of_scalar_znx_dft(1)
             + module.vec_znx_big_normalize_tmp_bytes()
@@ -71,7 +71,7 @@ impl<DataSelf: AsRef<[u8]> + AsMut<[u8]>> GLWECiphertext<DataSelf> {
         sigma: f64,
         scratch: &mut Scratch,
     ) {
-        self.encrypt_pk_private(
+        self.encrypt_pk_private::<DataPt, DataPk>(
             module,
             Some((pt, 0)),
             pk,
@@ -91,7 +91,7 @@ impl<DataSelf: AsRef<[u8]> + AsMut<[u8]>> GLWECiphertext<DataSelf> {
         sigma: f64,
         scratch: &mut Scratch,
     ) {
-        self.encrypt_pk_private(
+        self.encrypt_pk_private::<Vec<u8>, DataPk>(
             module,
             None::<(&GLWEPlaintext<Vec<u8>>, usize)>,
             pk,

core/src/glwe/external_product.rs

@@ -2,7 +2,7 @@ use backend::{
     FFT64, MatZnxDftOps, MatZnxDftScratch, Module, Scratch, VecZnxBig, VecZnxBigOps, VecZnxDftAlloc, VecZnxDftOps, VecZnxScratch,
 };
 
-use crate::{FourierGLWECiphertext, GGSWCiphertext, GLWECiphertext, Infos, div_ceil};
+use crate::{FourierGLWECiphertext, GGSWCiphertext, GLWECiphertext, Infos};
 
 impl GLWECiphertext<Vec<u8>> {
     pub fn external_product_scratch_space(
@@ -10,14 +10,14 @@ impl GLWECiphertext<Vec<u8>> {
         basek: usize,
         k_out: usize,
         k_in: usize,
-        ggsw_k: usize,
+        k_ggsw: usize,
         digits: usize,
         rank: usize,
     ) -> usize {
         let res_dft: usize = FourierGLWECiphertext::bytes_of(module, basek, k_out, rank);
-        let in_size: usize = div_ceil(div_ceil(k_in, basek), digits);
+        let in_size: usize = k_in.div_ceil(basek).div_ceil(digits);
-        let out_size: usize = div_ceil(k_out, basek);
+        let out_size: usize = k_out.div_ceil(basek);
-        let ggsw_size: usize = div_ceil(ggsw_k, basek);
+        let ggsw_size: usize = k_ggsw.div_ceil(basek);
         let vmp: usize = module.bytes_of_vec_znx_dft(rank + 1, in_size)
             + module.vmp_apply_tmp_bytes(
                 out_size,
@@ -35,11 +35,11 @@ impl GLWECiphertext<Vec<u8>> {
         module: &Module<FFT64>,
         basek: usize,
         k_out: usize,
-        ggsw_k: usize,
+        k_ggsw: usize,
         digits: usize,
         rank: usize,
     ) -> usize {
-        Self::external_product_scratch_space(module, basek, k_out, k_out, ggsw_k, digits, rank)
+        Self::external_product_scratch_space(module, basek, k_out, k_out, k_ggsw, digits, rank)
     }
 }
 

core/src/glwe/keyswitch.rs

@@ -3,7 +3,7 @@ use backend::{
     VecZnxDftOps, ZnxZero,
 };
 
-use crate::{FourierGLWECiphertext, GLWECiphertext, GLWESwitchingKey, Infos, div_ceil};
+use crate::{FourierGLWECiphertext, GLWECiphertext, GLWESwitchingKey, Infos};
 
 impl GLWECiphertext<Vec<u8>> {
     pub fn keyswitch_scratch_space(
@@ -17,9 +17,9 @@ impl GLWECiphertext<Vec<u8>> {
         rank_out: usize,
     ) -> usize {
         let res_dft: usize = FourierGLWECiphertext::bytes_of(module, basek, k_out, rank_out + 1);
-        let in_size: usize = div_ceil(div_ceil(k_in, basek), digits);
+        let in_size: usize = k_in.div_ceil(basek).div_ceil(digits);
-        let out_size: usize = div_ceil(k_out, basek);
+        let out_size: usize = k_out.div_ceil(basek);
-        let ksk_size: usize = div_ceil(k_ksk, basek);
+        let ksk_size: usize = k_ksk.div_ceil(basek);
         let ai_dft: usize = module.bytes_of_vec_znx_dft(rank_in, in_size);
         let vmp: usize = module.vmp_apply_tmp_bytes(out_size, in_size, in_size, rank_in, rank_out + 1, ksk_size)
             + module.bytes_of_vec_znx_dft(rank_in, in_size);

core/src/glwe/plaintext.rs

@@ -1,6 +1,6 @@
 use backend::{Backend, FFT64, Module, VecZnx, VecZnxAlloc, VecZnxToMut, VecZnxToRef};
 
-use crate::{GLWECiphertext, GLWECiphertextToMut, GLWECiphertextToRef, GLWEOps, Infos, SetMetaData, div_ceil};
+use crate::{GLWECiphertext, GLWECiphertextToMut, GLWECiphertextToRef, GLWEOps, Infos, SetMetaData};
 
 pub struct GLWEPlaintext<C> {
     pub data: VecZnx<C>,

core/src/glwe/test_fft64/automorphism.rs

@@ -3,7 +3,7 @@ use backend::{FFT64, FillUniform, Module, ScratchOwned, Stats, VecZnxOps};
 use sampling::source::Source;
 
 use crate::{
-    FourierGLWESecret, GLWEAutomorphismKey, GLWECiphertext, GLWEPlaintext, GLWESecret, Infos, div_ceil,
+    FourierGLWESecret, GLWEAutomorphismKey, GLWECiphertext, GLWEPlaintext, GLWESecret, Infos,
     noise::log2_std_noise_gglwe_product,
 };
 
@@ -12,7 +12,7 @@ fn apply_inplace() {
     let log_n: usize = 8;
     let basek: usize = 12;
     let k_ct: usize = 60;
-    let digits: usize = div_ceil(k_ct, basek);
+    let digits: usize = k_ct.div_ceil(basek);
     (1..4).for_each(|rank| {
         (1..digits + 1).for_each(|di| {
             let k_ksk: usize = k_ct + basek * di;
@@ -27,7 +27,7 @@ fn apply() {
     let log_n: usize = 8;
     let basek: usize = 12;
     let k_in: usize = 60;
-    let digits: usize = div_ceil(k_in, basek);
+    let digits: usize = k_in.div_ceil(basek);
     (1..4).for_each(|rank| {
         (1..digits + 1).for_each(|di| {
             let k_ksk: usize = k_in + basek * di;
@@ -51,7 +51,7 @@ fn test_automorphism(
 ) {
     let module: Module<FFT64> = Module::<FFT64>::new(1 << log_n);
 
-    let rows: usize = div_ceil(k_in, basek * digits);
+    let rows: usize = k_in.div_ceil(basek * digits);
 
     let mut autokey: GLWEAutomorphismKey<Vec<u8>, FFT64> = GLWEAutomorphismKey::alloc(&module, basek, k_ksk, rows, digits, rank);
     let mut ct_in: GLWECiphertext<Vec<u8>> = GLWECiphertext::alloc(&module, basek, k_in, rank);
@@ -149,7 +149,7 @@ fn test_automorphism_inplace(
 ) {
     let module: Module<FFT64> = Module::<FFT64>::new(1 << log_n);
 
-    let rows: usize = div_ceil(k_ct, basek * digits);
+    let rows: usize = k_ct.div_ceil(basek * digits);
 
     let mut autokey: GLWEAutomorphismKey<Vec<u8>, FFT64> = GLWEAutomorphismKey::alloc(&module, basek, k_ksk, rows, digits, rank);
     let mut ct: GLWECiphertext<Vec<u8>> = GLWECiphertext::alloc(&module, basek, k_ct, rank);

core/src/glwe/test_fft64/external_product.rs

@@ -2,7 +2,7 @@ use backend::{FFT64, FillUniform, Module, ScalarZnx, ScalarZnxAlloc, ScratchOwne
 use sampling::source::Source;
 
 use crate::{
-    FourierGLWESecret, GGSWCiphertext, GLWECiphertext, GLWEPlaintext, GLWESecret, Infos, div_ceil, noise::noise_ggsw_product,
+    FourierGLWESecret, GGSWCiphertext, GLWECiphertext, GLWEPlaintext, GLWESecret, Infos, noise::noise_ggsw_product,
 };
 
 #[test]
@@ -10,7 +10,7 @@ fn apply() {
     let log_n: usize = 8;
     let basek: usize = 12;
     let k_in: usize = 45;
-    let digits: usize = div_ceil(k_in, basek);
+    let digits: usize = k_in.div_ceil(basek);
     (1..4).for_each(|rank| {
         (1..digits + 1).for_each(|di| {
             let k_ggsw: usize = k_in + basek * di;

core/src/glwe/test_fft64/keyswitch.rs

@@ -2,7 +2,7 @@ use backend::{FFT64, FillUniform, Module, ScratchOwned, Stats, VecZnxOps};
 use sampling::source::Source;
 
 use crate::{
-    FourierGLWESecret, GLWECiphertext, GLWEPlaintext, GLWESecret, GLWESwitchingKey, Infos, div_ceil,
+    FourierGLWESecret, GLWECiphertext, GLWEPlaintext, GLWESecret, GLWESwitchingKey, Infos,
     noise::log2_std_noise_gglwe_product,
 };
 
@@ -11,7 +11,7 @@ fn apply() {
     let log_n: usize = 8;
     let basek: usize = 12;
     let k_in: usize = 45;
-    let digits: usize = div_ceil(k_in, basek);
+    let digits: usize = k_in.div_ceil(basek);
     (1..4).for_each(|rank_in| {
         (1..4).for_each(|rank_out| {
             (1..digits + 1).for_each(|di| {
@@ -32,7 +32,7 @@ fn apply_inplace() {
     let log_n: usize = 8;
     let basek: usize = 12;
     let k_ct: usize = 45;
-    let digits: usize = div_ceil(k_ct, basek);
+    let digits: usize = k_ct.div_ceil(basek);
     (1..4).for_each(|rank| {
         (1..digits + 1).for_each(|di| {
             let k_ksk: usize = k_ct + basek * di;
@@ -55,7 +55,7 @@ fn test_keyswitch(
 ) {
     let module: Module<FFT64> = Module::<FFT64>::new(1 << log_n);
 
-    let rows: usize = div_ceil(k_in, basek * digits);
+    let rows: usize = k_in.div_ceil(basek * digits);
 
     let mut ksk: GLWESwitchingKey<Vec<u8>, FFT64> =
         GLWESwitchingKey::alloc(&module, basek, k_ksk, rows, digits, rank_in, rank_out);
@@ -148,7 +148,7 @@ fn test_keyswitch(
 fn test_keyswitch_inplace(log_n: usize, basek: usize, k_ct: usize, k_ksk: usize, digits: usize, rank: usize, sigma: f64) {
     let module: Module<FFT64> = Module::<FFT64>::new(1 << log_n);
 
-    let rows: usize = div_ceil(k_ct, basek * digits);
+    let rows: usize = k_ct.div_ceil(basek * digits);
 
     let mut ct_grlwe: GLWESwitchingKey<Vec<u8>, FFT64> = GLWESwitchingKey::alloc(&module, basek, k_ksk, rows, digits, rank, rank);
     let mut ct_glwe: GLWECiphertext<Vec<u8>> = GLWECiphertext::alloc(&module, basek, k_ct, rank);

core/src/glwe/test_fft64/packing.rs

@@ -1,4 +1,4 @@
-use crate::{FourierGLWESecret, GLWEAutomorphismKey, GLWECiphertext, GLWEOps, GLWEPacker, GLWEPlaintext, GLWESecret, div_ceil};
+use crate::{FourierGLWESecret, GLWEAutomorphismKey, GLWECiphertext, GLWEOps, GLWEPacker, GLWEPlaintext, GLWESecret};
 use std::collections::HashMap;
 
 use backend::{Encoding, FFT64, Module, ScratchOwned, Stats};

core/src/glwe/test_fft64/trace.rs

@@ -4,7 +4,7 @@ use backend::{FFT64, FillUniform, Module, ScratchOwned, Stats, VecZnxOps, ZnxVie
 use sampling::source::Source;
 
 use crate::{
-    FourierGLWESecret, GLWEAutomorphismKey, GLWECiphertext, GLWEPlaintext, GLWESecret, Infos, div_ceil,
+    FourierGLWESecret, GLWEAutomorphismKey, GLWECiphertext, GLWEPlaintext, GLWESecret, Infos,
     noise::var_noise_gglwe_product,
 };
 

core/src/lib.rs

@@ -7,18 +7,17 @@ pub mod ggsw;
 pub mod glwe;
 pub mod lwe;
 pub mod noise;
-mod utils;
 
 use backend::Backend;
 use backend::FFT64;
 use backend::Module;
-pub use elem::*;
+pub use elem::{GetRow, Infos, SetMetaData, SetRow};
 pub use fourier_glwe::{FourierGLWECiphertext, FourierGLWESecret};
 pub use gglwe::{GGLWECiphertext, GLWEAutomorphismKey, GLWESwitchingKey, GLWETensorKey};
-pub use ggsw::*;
+pub use ggsw::GGSWCiphertext;
 pub use glwe::{GLWECiphertext, GLWEOps, GLWEPacker, GLWEPlaintext, GLWEPublicKey, GLWESecret};
 pub(crate) use glwe::{GLWECiphertextToMut, GLWECiphertextToRef};
-pub use lwe::*;
+pub use lwe::{LWECiphertext, LWESecret};
 
 pub use backend::Scratch;
 pub use backend::ScratchOwned;
@@ -174,7 +173,7 @@ impl ScratchCore<FFT64> for Scratch {
         k: usize,
         rank: usize,
     ) -> (FourierGLWECiphertext<&mut [u8], FFT64>, &mut Self) {
-        let (data, scratch) = self.tmp_vec_znx_dft(module, rank + 1, div_ceil(k, basek));
+        let (data, scratch) = self.tmp_vec_znx_dft(module, rank + 1, k.div_ceil(basek));
         (FourierGLWECiphertext { data, basek, k }, scratch)
     }
 

core/src/lwe/ciphertext.rs

@@ -0,0 +1,77 @@
+use backend::{VecZnx, VecZnxToMut, VecZnxToRef};
+
+use crate::{Infos, SetMetaData};
+
+pub struct LWECiphertext<D> {
+    pub(crate) data: VecZnx<D>,
+    pub(crate) k: usize,
+    pub(crate) basek: usize,
+}
+
+impl LWECiphertext<Vec<u8>> {
+    pub fn alloc(n: usize, basek: usize, k: usize) -> Self {
+        Self {
+            data: VecZnx::new::<i64>(n, 1, k.div_ceil(basek)),
+            k: k,
+            basek: basek,
+        }
+    }
+}
+
+impl<T> Infos for LWECiphertext<T> {
+    type Inner = VecZnx<T>;
+
+    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: AsMut<[u8]> + AsRef<[u8]>> 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: AsRef<[u8]>> 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 {
+    fn to_mut(&mut self) -> LWECiphertext<&mut [u8]>;
+}
+
+impl<D: AsMut<[u8]> + AsRef<[u8]>> LWECiphertextToMut for LWECiphertext<D> {
+    fn to_mut(&mut self) -> LWECiphertext<&mut [u8]> {
+        LWECiphertext {
+            data: self.data.to_mut(),
+            basek: self.basek,
+            k: self.k,
+        }
+    }
+}

core/src/lwe/decryption.rs

@@ -0,0 +1,21 @@
+use backend::{alloc_aligned, ZnxView, ZnxViewMut};
+
+use crate::{lwe::{LWEPlaintext}, Infos, LWECiphertext, LWESecret, SetMetaData};
+
+impl<DataSelf> LWECiphertext<DataSelf> where DataSelf: AsRef<[u8]>{
+    pub fn decrypt<DataPt, DataSk>(&self, pt: &mut LWEPlaintext<DataPt>, sk: &LWESecret<DataSk>) where DataPt: AsRef<[u8]> + AsMut<[u8]>, DataSk: AsRef<[u8]>{
+        #[cfg(debug_assertions)]{
+            assert_eq!(self.n(), sk.n());
+        }
+
+        (0..pt.size().min(self.size())).for_each(|i|{
+            pt.data.at_mut(0, i)[0] = self.data.at(0, i)[0] + self.data.at(0, i)[1..].iter().zip(sk.data.at(0, 0)).map(|(x, y)| x * y).sum::<i64>();
+        });
+
+        let mut tmp_bytes: Vec<u8> = alloc_aligned(size_of::<i64>());
+        pt.data.normalize(self.basek(), 0, &mut tmp_bytes);
+
+        pt.set_basek(self.basek());
+        pt.set_k(self.k().min(pt.size() * self.basek()));
+    }
+}

core/src/lwe/encryption.rs

@@ -0,0 +1,35 @@
+use backend::{alloc_aligned, AddNormal, FillUniform, VecZnx, ZnxView, ZnxViewMut};
+use sampling::source::Source;
+
+use crate::{lwe::LWEPlaintext, Infos, LWECiphertext, LWESecret, SIX_SIGMA};
+
+
+
+impl<DataSelf> LWECiphertext<DataSelf> where DataSelf: AsMut<[u8]> + AsRef<[u8]>{
+    pub fn encrypt_sk<DataPt, DataSk>(&mut self, pt: &LWEPlaintext<DataPt>, sk: &LWESecret<DataSk>, source_xa: &mut Source, source_xe: &mut Source, sigma: f64) where DataPt: AsRef<[u8]>, DataSk: AsRef<[u8]>{
+
+        #[cfg(debug_assertions)]{
+            assert_eq!(self.n(), sk.n())
+        }
+
+        let basek: usize = self.basek();
+
+        self.data.fill_uniform(basek, 0, self.size(), source_xa);
+        let mut tmp_znx: VecZnx<Vec<u8>> = VecZnx::<Vec<u8>>::new::<i64>(1, 1, self.size());
+
+        (0..self.size()).for_each(|i|{
+            tmp_znx.at_mut(0, i)[0] = pt.data.at(0, i)[0] - self.data.at(0, i)[1..].iter().zip(sk.data.at(0, 0)).map(|(x, y)| x * y).sum::<i64>();
+        });
+
+        tmp_znx.add_normal(basek, 0, self.k(), source_xe, sigma, sigma*SIX_SIGMA);
+
+        let mut tmp_bytes: Vec<u8> = alloc_aligned(size_of::<i64>());
+
+        tmp_znx.normalize(basek, 0, &mut tmp_bytes);
+
+        (0..self.size()).for_each(|i|{
+            self.data.at_mut(0, i)[0] = tmp_znx.at(0, i)[0];
+        });
+
+    }
+}

core/src/lwe/mod.rs

@@ -1,3 +1,9 @@
+pub mod ciphertext;
 pub mod secret;
+pub mod encryption;
+pub mod decryption;
+pub mod plaintext;
 
+pub use ciphertext::LWECiphertext;
 pub use secret::LWESecret;
+pub use plaintext::LWEPlaintext;

core/src/lwe/plaintext.rs

@@ -0,0 +1,73 @@
+use backend::{VecZnx, VecZnxToMut, VecZnxToRef};
+
+use crate::{Infos, SetMetaData};
+
+pub struct LWEPlaintext<D>{
+    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::new::<i64>(1, 1, k.div_ceil(basek)),
+            k: k,
+            basek: basek,
+        }
+    }
+}
+
+impl<T> Infos for LWEPlaintext<T> {
+    type Inner = VecZnx<T>;
+
+    fn inner(&self) -> &Self::Inner {
+        &self.data
+    }
+
+    fn basek(&self) -> usize {
+        self.basek
+    }
+
+    fn k(&self) -> usize {
+        self.k
+    }
+}
+
+impl<DataSelf: AsMut<[u8]> + AsRef<[u8]>> SetMetaData for LWEPlaintext<DataSelf> {
+    fn set_k(&mut self, k: usize) {
+        self.k = k
+    }
+
+    fn set_basek(&mut self, basek: usize) {
+        self.basek = basek
+    }
+}
+
+pub trait LWEPlaintextToRef {
+    fn to_ref(&self) -> LWEPlaintext<&[u8]>;
+}
+
+impl<D: AsRef<[u8]>> 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 {
+    fn to_mut(&mut self) -> LWEPlaintext<&mut [u8]>;
+}
+
+impl<D: AsMut<[u8]> + AsRef<[u8]>> LWEPlaintextToMut for LWEPlaintext<D> {
+    fn to_mut(&mut self) -> LWEPlaintext<&mut [u8]> {
+        LWEPlaintext {
+            data: self.data.to_mut(),
+            basek: self.basek,
+            k: self.k,
+        }
+    }
+}