fixed tests for ciphertext fourier

base2k/examples/rlwe_encrypt.rs

@@ -130,6 +130,4 @@ fn main() {
         .for_each(|(i, (a, b))| {
             println!("{}: {} {}", i, a, (*b as f64) / scale);
         });
-
-    module.free();
 }

base2k/src/lib.rs

@@ -150,8 +150,7 @@ impl Scratch {
         unsafe { &mut *(data as *mut [u8] as *mut Self) }
     }
 
-    #[allow(dead_code)]
-    fn available(&self) -> usize {
+    pub fn available(&self) -> usize {
         let ptr: *const u8 = self.data.as_ptr();
         let self_len: usize = self.data.len();
         let aligned_offset: usize = ptr.align_offset(DEFAULTALIGN);

base2k/src/mat_znx_dft_ops.rs

@@ -337,8 +337,6 @@ mod tests {
                 assert_eq!(a_dft.raw(), b_dft.raw());
             }
         }
-
-        module.free();
     }
 
     #[test]
@@ -425,7 +423,5 @@ mod tests {
                 });
             });
         });
-
-        module.free();
     }
 }

core/src/gglwe_ciphertext.rs

@@ -255,6 +255,17 @@ where
             assert_eq!(self.n(), module.n());
             assert_eq!(res.n(), module.n());
             assert_eq!(a.n(), module.n());
+            assert!(
+                scratch.available()
+                    >= GGLWECiphertext::prod_with_glwe_scratch_space(
+                        module,
+                        res.size(),
+                        a.size(),
+                        self.size(),
+                        self.rank_in(),
+                        self.rank_out()
+                    )
+            );
         }
 
         let cols_in: usize = self.rank_in();

core/src/glwe_ciphertext_fourier.rs

@@ -98,25 +98,25 @@ impl GLWECiphertextFourier<Vec<u8>, FFT64> {
         rank_in: usize,
         rank_out: usize,
     ) -> usize {
-        <GGLWECiphertext<Vec<u8>, FFT64> as VecGLWEProductScratchSpace>::prod_with_glwe_scratch_space(
+        <GGLWECiphertext<Vec<u8>, FFT64> as VecGLWEProductScratchSpace>::prod_with_glwe_fourier_scratch_space(
             module, res_size, lhs, rhs, rank_in, rank_out,
         )
     }
 
     pub fn keyswitch_inplace_scratch_space(module: &Module<FFT64>, res_size: usize, rhs: usize, rank: usize) -> usize {
-        <GGLWECiphertext<Vec<u8>, FFT64> as VecGLWEProductScratchSpace>::prod_with_glwe_inplace_scratch_space(
+        <GGLWECiphertext<Vec<u8>, FFT64> as VecGLWEProductScratchSpace>::prod_with_glwe_fourier_inplace_scratch_space(
             module, res_size, rhs, rank,
         )
     }
 
     pub fn external_product_scratch_space(module: &Module<FFT64>, res_size: usize, lhs: usize, rhs: usize, rank: usize) -> usize {
-        <GGSWCiphertext<Vec<u8>, FFT64> as VecGLWEProductScratchSpace>::prod_with_glwe_scratch_space(
+        <GGSWCiphertext<Vec<u8>, FFT64> as VecGLWEProductScratchSpace>::prod_with_glwe_fourier_scratch_space(
             module, res_size, lhs, rhs, rank, rank,
         )
     }
 
     pub fn external_product_inplace_scratch_space(module: &Module<FFT64>, res_size: usize, rhs: usize, rank: usize) -> usize {
-        <GGSWCiphertext<Vec<u8>, FFT64> as VecGLWEProductScratchSpace>::prod_with_glwe_inplace_scratch_space(
+        <GGSWCiphertext<Vec<u8>, FFT64> as VecGLWEProductScratchSpace>::prod_with_glwe_fourier_inplace_scratch_space(
             module, res_size, rhs, rank,
         )
     }

core/src/test_fft64/ggsw.rs

@@ -567,7 +567,7 @@
 // });
 // });
 // }
-pub(crate) fn noise_rgsw_product(
+pub(crate) fn noise_ggsw_gglwe_product(
     n: f64,
     log_base2k: usize,
     var_xs: f64,

core/src/test_fft64/glwe.rs

@@ -13,7 +13,7 @@ use crate::{
     glwe_plaintext::GLWEPlaintext,
     keys::{GLWEPublicKey, SecretKey, SecretKeyFourier},
     keyswitch_key::GLWESwitchingKey,
-    test_fft64::{gglwe::noise_gglwe_product, ggsw::noise_rgsw_product},
+    test_fft64::{gglwe::noise_gglwe_product, ggsw::noise_ggsw_gglwe_product},
 };
 
 #[test]
@@ -58,6 +58,22 @@ fn keyswitch_inplace() {
     });
 }
 
+#[test]
+fn external_product() {
+    (1..4).for_each(|rank| {
+        println!("test external_product rank: {}", rank);
+        test_external_product(12, 12, 60, 45, 60, rank, 3.2);
+    });
+}
+
+#[test]
+fn external_product_inplace() {
+    (1..4).for_each(|rank| {
+        println!("test external_product rank: {}", rank);
+        test_external_product_inplace(12, 15, 60, 60, rank, 3.2);
+    });
+}
+
 fn test_encrypt_sk(log_n: usize, basek: usize, k_ct: usize, k_pt: usize, sigma: f64, rank: usize) {
     let module: Module<FFT64> = Module::<FFT64>::new(1 << log_n);
 
@@ -399,14 +415,6 @@ fn test_keyswitch_inplace(log_n: usize, basek: usize, k_ksk: usize, k_ct: usize,
     );
 }
 
-#[test]
-fn external_product() {
-    (1..4).for_each(|rank| {
-        println!("test external_product rank: {}", rank);
-        test_external_product(12, 12, 60, 45, 60, rank, 3.2);
-    });
-}
-
 fn test_external_product(log_n: usize, basek: usize, k_ggsw: usize, k_ct_in: usize, k_ct_out: usize, rank: usize, sigma: f64) {
     let module: Module<FFT64> = Module::<FFT64>::new(1 << log_n);
 
@@ -490,7 +498,7 @@ fn test_external_product(log_n: usize, basek: usize, k_ggsw: usize, k_ct_in: usi
     let var_a0_err: f64 = sigma * sigma;
     let var_a1_err: f64 = 1f64 / 12f64;
 
-    let noise_want: f64 = noise_rgsw_product(
+    let noise_want: f64 = noise_ggsw_gglwe_product(
         module.n() as f64,
         basek,
         0.5,
@@ -512,14 +520,6 @@ fn test_external_product(log_n: usize, basek: usize, k_ggsw: usize, k_ct_in: usi
     );
 }
 
-#[test]
-fn external_product_inplace() {
-    (1..4).for_each(|rank| {
-        println!("test external_product rank: {}", rank);
-        test_external_product_inplace(12, 15, 60, 60, rank, 3.2);
-    });
-}
-
 fn test_external_product_inplace(log_n: usize, basek: usize, k_ggsw: usize, k_ct: usize, rank: usize, sigma: f64) {
     let module: Module<FFT64> = Module::<FFT64>::new(1 << log_n);
     let rows: usize = (k_ct + basek - 1) / basek;
@@ -595,7 +595,7 @@ fn test_external_product_inplace(log_n: usize, basek: usize, k_ggsw: usize, k_ct
     let var_a0_err: f64 = sigma * sigma;
     let var_a1_err: f64 = 1f64 / 12f64;
 
-    let noise_want: f64 = noise_rgsw_product(
+    let noise_want: f64 = noise_ggsw_gglwe_product(
         module.n() as f64,
         basek,
         0.5,

core/src/test_fft64/glwe_fourier.rs

@@ -1,438 +1,445 @@
-// use crate::{
-// elem::Infos,
-// ggsw_ciphertext::GGSWCiphertext,
-// glwe_ciphertext::GLWECiphertext,
-// glwe_ciphertext_fourier::GLWECiphertextFourier,
-// glwe_plaintext::GLWEPlaintext,
-// keys::{SecretKey, SecretKeyFourier},
-// keyswitch_key::GLWESwitchingKey,
-// test_fft64::{gglwe::noise_grlwe_rlwe_product, ggsw::noise_rgsw_product},
-// };
-// use base2k::{FFT64, FillUniform, Module, ScalarZnx, ScalarZnxAlloc, ScratchOwned, Stats, VecZnxOps, VecZnxToMut, ZnxViewMut};
-// use sampling::source::Source;
-//
-// #[test]
-// fn keyswitch() {
-// let module: Module<FFT64> = Module::<FFT64>::new(2048);
-// let log_base2k: usize = 12;
-// let log_k_grlwe: usize = 60;
-// let log_k_rlwe_in: usize = 45;
-// let log_k_rlwe_out: usize = 60;
-// let rows: usize = (log_k_rlwe_in + log_base2k - 1) / log_base2k;
-//
-// let rank: usize = 1;
-//
-// let sigma: f64 = 3.2;
-//
-// let mut ct_grlwe: GLWESwitchingKey<Vec<u8>, FFT64> =
-// GLWESwitchingKey::new(&module, log_base2k, log_k_grlwe, rows, rank, rank);
-// let mut ct_rlwe_in: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, log_base2k, log_k_rlwe_in, rank);
-// let mut ct_rlwe_in_dft: GLWECiphertextFourier<Vec<u8>, FFT64> =
-// GLWECiphertextFourier::new(&module, log_base2k, log_k_rlwe_in, rank);
-// let mut ct_rlwe_out: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, log_base2k, log_k_rlwe_out, rank);
-// let mut ct_rlwe_out_dft: GLWECiphertextFourier<Vec<u8>, FFT64> =
-// GLWECiphertextFourier::new(&module, log_base2k, log_k_rlwe_out, rank);
-// let mut pt_want: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, log_base2k, log_k_rlwe_in);
-// let mut pt_have: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, log_base2k, log_k_rlwe_out);
-//
-// 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]);
-//
+use crate::{
+    elem::Infos,
+    ggsw_ciphertext::GGSWCiphertext,
+    glwe_ciphertext::GLWECiphertext,
+    glwe_ciphertext_fourier::GLWECiphertextFourier,
+    glwe_plaintext::GLWEPlaintext,
+    keys::{SecretKey, SecretKeyFourier},
+    keyswitch_key::GLWESwitchingKey,
+    test_fft64::{gglwe::noise_gglwe_product, ggsw::noise_ggsw_gglwe_product},
+};
+use base2k::{FFT64, FillUniform, Module, ScalarZnx, ScalarZnxAlloc, ScratchOwned, Stats, VecZnxOps, VecZnxToMut, ZnxViewMut};
+use sampling::source::Source;
+
+#[test]
+fn keyswitch() {
+    (1..4).for_each(|rank_in| {
+        (1..4).for_each(|rank_out| {
+            println!("test keyswitch rank_in: {} rank_out: {}", rank_in, rank_out);
+            test_keyswitch(12, 12, 60, 45, 60, rank_in, rank_out, 3.2);
+        });
+    });
+}
+
+#[test]
+fn keyswitch_inplace() {
+    (1..4).for_each(|rank| {
+        println!("test keyswitch_inplace rank: {}", rank);
+        test_keyswitch_inplace(12, 12, 60, 45, rank, 3.2);
+    });
+}
+
+#[test]
+fn external_product() {
+    (1..4).for_each(|rank| {
+        println!("test external_product rank: {}", rank);
+        test_external_product(12, 12, 60, 45, 60, rank, 3.2);
+    });
+}
+
+#[test]
+fn external_product_inplace() {
+    (1..4).for_each(|rank| {
+        println!("test external_product rank: {}", rank);
+        test_external_product_inplace(12, 15, 60, 60, rank, 3.2);
+    });
+}
+
+fn test_keyswitch(
+    log_n: usize,
+    basek: usize,
+    k_ksk: usize,
+    k_ct_in: usize,
+    k_ct_out: usize,
+    rank_in: usize,
+    rank_out: usize,
+    sigma: f64,
+) {
+    let module: Module<FFT64> = Module::<FFT64>::new(1 << log_n);
+
+    let rows: usize = (k_ct_in + basek - 1) / basek;
+
+    let mut ksk: GLWESwitchingKey<Vec<u8>, FFT64> = GLWESwitchingKey::new(&module, basek, k_ksk, rows, rank_in, rank_out);
+    let mut ct_glwe_in: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, basek, k_ct_in, rank_in);
+    let mut ct_glwe_dft_in: GLWECiphertextFourier<Vec<u8>, FFT64> = GLWECiphertextFourier::new(&module, basek, k_ct_in, rank_in);
+    let mut ct_glwe_out: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, basek, k_ct_out, rank_out);
+    let mut ct_glwe_dft_out: GLWECiphertextFourier<Vec<u8>, FFT64> =
+        GLWECiphertextFourier::new(&module, basek, k_ct_out, rank_out);
+    let mut pt_want: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, basek, k_ct_in);
+    let mut pt_have: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, basek, k_ct_out);
+
+    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]);
+
     // Random input plaintext
-// pt_want
-// .data
-// .fill_uniform(log_base2k, 0, pt_want.size(), &mut source_xa);
-//
-// let mut scratch: ScratchOwned = ScratchOwned::new(
-// GLWESwitchingKey::encrypt_sk_scratch_space(&module, rank, ct_grlwe.size())
-// | GLWECiphertext::decrypt_scratch_space(&module, ct_rlwe_out.size())
-// | GLWECiphertext::encrypt_sk_scratch_space(&module, rank, ct_rlwe_in.size())
-// | GLWECiphertextFourier::keyswitch_scratch_space(
-// &module,
-// ct_rlwe_out.size(),
-// ct_rlwe_in.size(),
-// ct_grlwe.size(),
-// ),
-// );
-//
-// let mut sk0: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
-// sk0.fill_ternary_prob(0.5, &mut source_xs);
-//
-// let mut sk0_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank);
-// sk0_dft.dft(&module, &sk0);
-//
-// let mut sk1: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
-// sk1.fill_ternary_prob(0.5, &mut source_xs);
-//
-// let mut sk1_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank);
-// sk1_dft.dft(&module, &sk1);
-//
-// ct_grlwe.encrypt_sk(
-// &module,
-// &sk0.data,
-// &sk1_dft,
-// &mut source_xa,
-// &mut source_xe,
-// sigma,
-// scratch.borrow(),
-// );
-//
-// ct_rlwe_in.encrypt_sk(
-// &module,
-// &pt_want,
-// &sk0_dft,
-// &mut source_xa,
-// &mut source_xe,
-// sigma,
-// scratch.borrow(),
-// );
-//
-// ct_rlwe_in.dft(&module, &mut ct_rlwe_in_dft);
-// ct_rlwe_out_dft.keyswitch(&module, &ct_rlwe_in_dft, &ct_grlwe, scratch.borrow());
-// ct_rlwe_out_dft.idft(&module, &mut ct_rlwe_out, scratch.borrow());
-//
-// ct_rlwe_out.decrypt(&module, &mut pt_have, &sk1_dft, scratch.borrow());
-//
-// module.vec_znx_sub_ab_inplace(&mut pt_have, 0, &pt_want, 0);
-//
-// let noise_have: f64 = pt_have.data.std(0, log_base2k).log2();
-// let noise_want: f64 = noise_grlwe_rlwe_product(
-// module.n() as f64,
-// log_base2k,
-// 0.5,
-// 0.5,
-// 0f64,
-// sigma * sigma,
-// 0f64,
-// log_k_rlwe_in,
-// log_k_grlwe,
-// );
-//
-// assert!(
-// (noise_have - noise_want).abs() <= 0.1,
-// "{} {}",
-// noise_have,
-// noise_want
-// );
-// }
-//
-// #[test]
-// fn keyswich_inplace() {
-// let module: Module<FFT64> = Module::<FFT64>::new(2048);
-// let log_base2k: usize = 12;
-// let log_k_grlwe: usize = 60;
-// let log_k_rlwe: usize = 45;
-// let rows: usize = (log_k_rlwe + log_base2k - 1) / log_base2k;
-// let rank: usize = 1;
-//
-// let sigma: f64 = 3.2;
-//
-// let mut ct_grlwe: GLWESwitchingKey<Vec<u8>, FFT64> =
-// GLWESwitchingKey::new(&module, log_base2k, log_k_grlwe, rows, rank, rank);
-// let mut ct_rlwe: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, log_base2k, log_k_rlwe, rank);
-// let mut ct_rlwe_dft: GLWECiphertextFourier<Vec<u8>, FFT64> =
-// GLWECiphertextFourier::new(&module, log_base2k, log_k_rlwe, rank);
-// let mut pt_want: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, log_base2k, log_k_rlwe);
-// let mut pt_have: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, log_base2k, log_k_rlwe);
-//
-// 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]);
-//
+    pt_want
+        .data
+        .fill_uniform(basek, 0, pt_want.size(), &mut source_xa);
+
+    let mut scratch: ScratchOwned = ScratchOwned::new(
+        GLWESwitchingKey::encrypt_sk_scratch_space(&module, rank_out, ksk.size())
+            | GLWECiphertext::decrypt_scratch_space(&module, ct_glwe_out.size())
+            | GLWECiphertext::encrypt_sk_scratch_space(&module, ct_glwe_in.size())
+            | GLWECiphertextFourier::keyswitch_scratch_space(
+                &module,
+                ct_glwe_out.size(),
+                ct_glwe_in.size(),
+                ksk.size(),
+                rank_in,
+                rank_out,
+            ),
+    );
+
+    let mut sk_in: SecretKey<Vec<u8>> = SecretKey::new(&module, rank_in);
+    sk_in.fill_ternary_prob(0.5, &mut source_xs);
+
+    let mut sk_in_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank_in);
+    sk_in_dft.dft(&module, &sk_in);
+
+    let mut sk_out: SecretKey<Vec<u8>> = SecretKey::new(&module, rank_out);
+    sk_out.fill_ternary_prob(0.5, &mut source_xs);
+
+    let mut sk_out_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank_out);
+    sk_out_dft.dft(&module, &sk_out);
+
+    ksk.encrypt_sk(
+        &module,
+        &sk_in,
+        &sk_out_dft,
+        &mut source_xa,
+        &mut source_xe,
+        sigma,
+        scratch.borrow(),
+    );
+
+    ct_glwe_in.encrypt_sk(
+        &module,
+        &pt_want,
+        &sk_in_dft,
+        &mut source_xa,
+        &mut source_xe,
+        sigma,
+        scratch.borrow(),
+    );
+
+    ct_glwe_in.dft(&module, &mut ct_glwe_dft_in);
+    ct_glwe_dft_out.keyswitch(&module, &ct_glwe_dft_in, &ksk, scratch.borrow());
+    ct_glwe_dft_out.idft(&module, &mut ct_glwe_out, scratch.borrow());
+
+    ct_glwe_out.decrypt(&module, &mut pt_have, &sk_out_dft, scratch.borrow());
+
+    module.vec_znx_sub_ab_inplace(&mut pt_have, 0, &pt_want, 0);
+
+    let noise_have: f64 = pt_have.data.std(0, basek).log2();
+    let noise_want: f64 = noise_gglwe_product(
+        module.n() as f64,
+        basek,
+        0.5,
+        0.5,
+        0f64,
+        sigma * sigma,
+        0f64,
+        rank_in as f64,
+        k_ct_in,
+        k_ksk,
+    );
+
+    assert!(
+        (noise_have - noise_want).abs() <= 0.1,
+        "{} {}",
+        noise_have,
+        noise_want
+    );
+}
+
+fn test_keyswitch_inplace(log_n: usize, basek: usize, k_ksk: usize, k_ct: usize, rank: usize, sigma: f64) {
+    let module: Module<FFT64> = Module::<FFT64>::new(1 << log_n);
+    let rows: usize = (k_ct + basek - 1) / basek;
+
+    let mut ksk: GLWESwitchingKey<Vec<u8>, FFT64> = GLWESwitchingKey::new(&module, basek, k_ksk, rows, rank, rank);
+    let mut ct_glwe: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, basek, k_ct, rank);
+    let mut ct_rlwe_dft: GLWECiphertextFourier<Vec<u8>, FFT64> = GLWECiphertextFourier::new(&module, basek, k_ct, rank);
+    let mut pt_want: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, basek, k_ct);
+    let mut pt_have: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, basek, k_ct);
+
+    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]);
+
     // Random input plaintext
-// pt_want
-// .data
-// .fill_uniform(log_base2k, 0, pt_want.size(), &mut source_xa);
-//
-// let mut scratch: ScratchOwned = ScratchOwned::new(
-// GLWESwitchingKey::encrypt_sk_scratch_space(&module, rank, ct_grlwe.size())
-// | GLWECiphertext::decrypt_scratch_space(&module, ct_rlwe.size())
-// | GLWECiphertext::encrypt_sk_scratch_space(&module, rank, ct_rlwe.size())
-// | GLWECiphertextFourier::keyswitch_inplace_scratch_space(&module, ct_rlwe_dft.size(), ct_grlwe.size()),
-// );
-//
-// let mut sk0: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
-// sk0.fill_ternary_prob(0.5, &mut source_xs);
-//
-// let mut sk0_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank);
-// sk0_dft.dft(&module, &sk0);
-//
-// let mut sk1: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
-// sk1.fill_ternary_prob(0.5, &mut source_xs);
-//
-// let mut sk1_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank);
-// sk1_dft.dft(&module, &sk1);
-//
-// ct_grlwe.encrypt_sk(
-// &module,
-// &sk0.data,
-// &sk1_dft,
-// &mut source_xa,
-// &mut source_xe,
-// sigma,
-// scratch.borrow(),
-// );
-//
-// ct_rlwe.encrypt_sk(
-// &module,
-// &pt_want,
-// &sk0_dft,
-// &mut source_xa,
-// &mut source_xe,
-// sigma,
-// scratch.borrow(),
-// );
-//
-// ct_rlwe.dft(&module, &mut ct_rlwe_dft);
-// ct_rlwe_dft.keyswitch_inplace(&module, &ct_grlwe, scratch.borrow());
-// ct_rlwe_dft.idft(&module, &mut ct_rlwe, scratch.borrow());
-//
-// ct_rlwe.decrypt(&module, &mut pt_have, &sk1_dft, scratch.borrow());
-//
-// module.vec_znx_sub_ab_inplace(&mut pt_have, 0, &pt_want, 0);
-//
-// let noise_have: f64 = pt_have.data.std(0, log_base2k).log2();
-// let noise_want: f64 = noise_grlwe_rlwe_product(
-// module.n() as f64,
-// log_base2k,
-// 0.5,
-// 0.5,
-// 0f64,
-// sigma * sigma,
-// 0f64,
-// log_k_rlwe,
-// log_k_grlwe,
-// );
-//
-// assert!(
-// (noise_have - noise_want).abs() <= 0.1,
-// "{} {}",
-// noise_have,
-// noise_want
-// );
-// }
-//
-// #[test]
-// fn external_product() {
-// let module: Module<FFT64> = Module::<FFT64>::new(2048);
-// let log_base2k: usize = 12;
-// let log_k_grlwe: usize = 60;
-// let log_k_rlwe_in: usize = 45;
-// let log_k_rlwe_out: usize = 60;
-// let rows: usize = (log_k_rlwe_in + log_base2k - 1) / log_base2k;
-// let rank: usize = 1;
-//
-// let sigma: f64 = 3.2;
-//
-// let mut ct_rgsw: GGSWCiphertext<Vec<u8>, FFT64> = GGSWCiphertext::new(&module, log_base2k, log_k_grlwe, rows, rank);
-// let mut ct_rlwe_in: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, log_base2k, log_k_rlwe_in, rank);
-// let mut ct_rlwe_out: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, log_base2k, log_k_rlwe_out, rank);
-// let mut ct_rlwe_dft_in: GLWECiphertextFourier<Vec<u8>, FFT64> =
-// GLWECiphertextFourier::new(&module, log_base2k, log_k_rlwe_in, rank);
-// let mut ct_rlwe_dft_out: GLWECiphertextFourier<Vec<u8>, FFT64> =
-// GLWECiphertextFourier::new(&module, log_base2k, log_k_rlwe_out, rank);
-// let mut pt_rgsw: ScalarZnx<Vec<u8>> = module.new_scalar_znx(1);
-// let mut pt_want: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, log_base2k, log_k_rlwe_in);
-// let mut pt_have: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, log_base2k, log_k_rlwe_out);
-//
-// 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]);
-//
+    pt_want
+        .data
+        .fill_uniform(basek, 0, pt_want.size(), &mut source_xa);
+
+    let mut scratch: ScratchOwned = ScratchOwned::new(
+        GLWESwitchingKey::encrypt_sk_scratch_space(&module, rank, ksk.size())
+            | GLWECiphertext::decrypt_scratch_space(&module, ct_glwe.size())
+            | GLWECiphertext::encrypt_sk_scratch_space(&module, ct_glwe.size())
+            | GLWECiphertextFourier::keyswitch_inplace_scratch_space(&module, ct_rlwe_dft.size(), ksk.size(), rank),
+    );
+
+    let mut sk_in: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
+    sk_in.fill_ternary_prob(0.5, &mut source_xs);
+
+    let mut sk_in_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank);
+    sk_in_dft.dft(&module, &sk_in);
+
+    let mut sk_out: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
+    sk_out.fill_ternary_prob(0.5, &mut source_xs);
+
+    let mut sk_out_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank);
+    sk_out_dft.dft(&module, &sk_out);
+
+    ksk.encrypt_sk(
+        &module,
+        &sk_in,
+        &sk_out_dft,
+        &mut source_xa,
+        &mut source_xe,
+        sigma,
+        scratch.borrow(),
+    );
+
+    ct_glwe.encrypt_sk(
+        &module,
+        &pt_want,
+        &sk_in_dft,
+        &mut source_xa,
+        &mut source_xe,
+        sigma,
+        scratch.borrow(),
+    );
+
+    ct_glwe.dft(&module, &mut ct_rlwe_dft);
+    ct_rlwe_dft.keyswitch_inplace(&module, &ksk, scratch.borrow());
+    ct_rlwe_dft.idft(&module, &mut ct_glwe, scratch.borrow());
+
+    ct_glwe.decrypt(&module, &mut pt_have, &sk_out_dft, scratch.borrow());
+
+    module.vec_znx_sub_ab_inplace(&mut pt_have, 0, &pt_want, 0);
+
+    let noise_have: f64 = pt_have.data.std(0, basek).log2();
+    let noise_want: f64 = noise_gglwe_product(
+        module.n() as f64,
+        basek,
+        0.5,
+        0.5,
+        0f64,
+        sigma * sigma,
+        0f64,
+        rank as f64,
+        k_ct,
+        k_ksk,
+    );
+
+    assert!(
+        (noise_have - noise_want).abs() <= 0.1,
+        "{} {}",
+        noise_have,
+        noise_want
+    );
+}
+
+fn test_external_product(log_n: usize, basek: usize, k_ggsw: usize, k_ct_in: usize, k_ct_out: usize, rank: usize, sigma: f64) {
+    let module: Module<FFT64> = Module::<FFT64>::new(1 << log_n);
+
+    let rows: usize = (k_ct_in + basek - 1) / basek;
+
+    let mut ct_rgsw: GGSWCiphertext<Vec<u8>, FFT64> = GGSWCiphertext::new(&module, basek, k_ggsw, rows, rank);
+    let mut ct_in: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, basek, k_ct_in, rank);
+    let mut ct_out: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, basek, k_ct_out, rank);
+    let mut ct_in_dft: GLWECiphertextFourier<Vec<u8>, FFT64> = GLWECiphertextFourier::new(&module, basek, k_ct_in, rank);
+    let mut ct_out_dft: GLWECiphertextFourier<Vec<u8>, FFT64> = GLWECiphertextFourier::new(&module, basek, k_ct_out, rank);
+    let mut pt_rgsw: ScalarZnx<Vec<u8>> = module.new_scalar_znx(1);
+    let mut pt_want: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, basek, k_ct_in);
+    let mut pt_have: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, basek, k_ct_out);
+
+    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]);
+
     // Random input plaintext
-// pt_want
-// .data
-// .fill_uniform(log_base2k, 0, pt_want.size(), &mut source_xa);
-//
-// pt_want.to_mut().at_mut(0, 0)[1] = 1;
-//
-// let k: usize = 1;
-//
-// pt_rgsw.raw_mut()[k] = 1; // X^{k}
-//
-// let mut scratch: ScratchOwned = ScratchOwned::new(
-// GGSWCiphertext::encrypt_sk_scratch_space(&module, rank, ct_rgsw.size())
-// | GLWECiphertext::decrypt_scratch_space(&module, ct_rlwe_out.size())
-// | GLWECiphertext::encrypt_sk_scratch_space(&module, rank, ct_rlwe_in.size())
-// | GLWECiphertext::external_product_scratch_space(
-// &module,
-// ct_rlwe_out.size(),
-// ct_rlwe_in.size(),
-// ct_rgsw.size(),
-// ),
-// );
-//
-// let mut sk: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
-// sk.fill_ternary_prob(0.5, &mut source_xs);
-//
-// let mut sk_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank);
-// sk_dft.dft(&module, &sk);
-//
-// ct_rgsw.encrypt_sk(
-// &module,
-// &pt_rgsw,
-// &sk_dft,
-// &mut source_xa,
-// &mut source_xe,
-// sigma,
-// scratch.borrow(),
-// );
-//
-// ct_rlwe_in.encrypt_sk(
-// &module,
-// &pt_want,
-// &sk_dft,
-// &mut source_xa,
-// &mut source_xe,
-// sigma,
-// scratch.borrow(),
-// );
-//
-// ct_rlwe_in.dft(&module, &mut ct_rlwe_dft_in);
-// ct_rlwe_dft_out.external_product(&module, &ct_rlwe_dft_in, &ct_rgsw, scratch.borrow());
-// ct_rlwe_dft_out.idft(&module, &mut ct_rlwe_out, scratch.borrow());
-//
-// ct_rlwe_out.decrypt(&module, &mut pt_have, &sk_dft, scratch.borrow());
-//
-// module.vec_znx_rotate_inplace(k as i64, &mut pt_want, 0);
-//
-// module.vec_znx_sub_ab_inplace(&mut pt_have, 0, &pt_want, 0);
-//
-// let noise_have: f64 = pt_have.data.std(0, log_base2k).log2();
-//
-// let var_gct_err_lhs: f64 = sigma * sigma;
-// let var_gct_err_rhs: f64 = 0f64;
-//
-// let var_msg: f64 = 1f64 / module.n() as f64; // X^{k}
-// let var_a0_err: f64 = sigma * sigma;
-// let var_a1_err: f64 = 1f64 / 12f64;
-//
-// let noise_want: f64 = noise_rgsw_product(
-// module.n() as f64,
-// log_base2k,
-// 0.5,
-// var_msg,
-// var_a0_err,
-// var_a1_err,
-// var_gct_err_lhs,
-// var_gct_err_rhs,
-// log_k_rlwe_in,
-// log_k_grlwe,
-// );
-//
-// assert!(
-// (noise_have - noise_want).abs() <= 0.1,
-// "{} {}",
-// noise_have,
-// noise_want
-// );
-// }
-//
-// #[test]
-// fn external_product_inplace() {
-// let module: Module<FFT64> = Module::<FFT64>::new(2048);
-// let log_base2k: usize = 12;
-// let log_k_grlwe: usize = 60;
-// let log_k_rlwe_in: usize = 45;
-// let log_k_rlwe_out: usize = 60;
-// let rows: usize = (log_k_rlwe_in + log_base2k - 1) / log_base2k;
-// let rank: usize = 1;
-//
-// let sigma: f64 = 3.2;
-//
-// let mut ct_rgsw: GGSWCiphertext<Vec<u8>, FFT64> = GGSWCiphertext::new(&module, log_base2k, log_k_grlwe, rows, rank);
-// let mut ct_rlwe: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, log_base2k, log_k_rlwe_in, rank);
-// let mut ct_rlwe_dft: GLWECiphertextFourier<Vec<u8>, FFT64> =
-// GLWECiphertextFourier::new(&module, log_base2k, log_k_rlwe_in, rank);
-// let mut pt_rgsw: ScalarZnx<Vec<u8>> = module.new_scalar_znx(1);
-// let mut pt_want: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, log_base2k, log_k_rlwe_in);
-// let mut pt_have: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, log_base2k, log_k_rlwe_out);
-//
-// 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]);
-//
+    pt_want
+        .data
+        .fill_uniform(basek, 0, pt_want.size(), &mut source_xa);
+
+    pt_want.to_mut().at_mut(0, 0)[1] = 1;
+
+    let k: usize = 1;
+
+    pt_rgsw.raw_mut()[k] = 1; // X^{k}
+
+    let mut scratch: ScratchOwned = ScratchOwned::new(
+        GGSWCiphertext::encrypt_sk_scratch_space(&module, rank, ct_rgsw.size())
+            | GLWECiphertext::decrypt_scratch_space(&module, ct_out.size())
+            | GLWECiphertext::encrypt_sk_scratch_space(&module, ct_in.size())
+            | GLWECiphertextFourier::external_product_scratch_space(&module, ct_out.size(), ct_in.size(), ct_rgsw.size(), rank),
+    );
+
+    let mut sk: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
+    sk.fill_ternary_prob(0.5, &mut source_xs);
+
+    let mut sk_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank);
+    sk_dft.dft(&module, &sk);
+
+    ct_rgsw.encrypt_sk(
+        &module,
+        &pt_rgsw,
+        &sk_dft,
+        &mut source_xa,
+        &mut source_xe,
+        sigma,
+        scratch.borrow(),
+    );
+
+    ct_in.encrypt_sk(
+        &module,
+        &pt_want,
+        &sk_dft,
+        &mut source_xa,
+        &mut source_xe,
+        sigma,
+        scratch.borrow(),
+    );
+
+    ct_in.dft(&module, &mut ct_in_dft);
+    ct_out_dft.external_product(&module, &ct_in_dft, &ct_rgsw, scratch.borrow());
+    ct_out_dft.idft(&module, &mut ct_out, scratch.borrow());
+
+    ct_out.decrypt(&module, &mut pt_have, &sk_dft, scratch.borrow());
+
+    module.vec_znx_rotate_inplace(k as i64, &mut pt_want, 0);
+
+    module.vec_znx_sub_ab_inplace(&mut pt_have, 0, &pt_want, 0);
+
+    let noise_have: f64 = pt_have.data.std(0, basek).log2();
+
+    let var_gct_err_lhs: f64 = sigma * sigma;
+    let var_gct_err_rhs: f64 = 0f64;
+
+    let var_msg: f64 = 1f64 / module.n() as f64; // X^{k}
+    let var_a0_err: f64 = sigma * sigma;
+    let var_a1_err: f64 = 1f64 / 12f64;
+
+    let noise_want: f64 = noise_ggsw_gglwe_product(
+        module.n() as f64,
+        basek,
+        0.5,
+        var_msg,
+        var_a0_err,
+        var_a1_err,
+        var_gct_err_lhs,
+        var_gct_err_rhs,
+        rank as f64,
+        k_ct_in,
+        k_ggsw,
+    );
+
+    assert!(
+        (noise_have - noise_want).abs() <= 0.1,
+        "{} {}",
+        noise_have,
+        noise_want
+    );
+}
+
+fn test_external_product_inplace(log_n: usize, basek: usize, k_ggsw: usize, k_ct: usize, rank: usize, sigma: f64) {
+    let module: Module<FFT64> = Module::<FFT64>::new(1 << log_n);
+    let rows: usize = (k_ct + basek - 1) / basek;
+
+    let mut ct_ggsw: GGSWCiphertext<Vec<u8>, FFT64> = GGSWCiphertext::new(&module, basek, k_ggsw, rows, rank);
+    let mut ct: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, basek, k_ct, rank);
+    let mut ct_rlwe_dft: GLWECiphertextFourier<Vec<u8>, FFT64> = GLWECiphertextFourier::new(&module, basek, k_ct, rank);
+    let mut pt_rgsw: ScalarZnx<Vec<u8>> = module.new_scalar_znx(1);
+    let mut pt_want: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, basek, k_ct);
+    let mut pt_have: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, basek, k_ct);
+
+    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]);
+
     // Random input plaintext
-// pt_want
-// .data
-// .fill_uniform(log_base2k, 0, pt_want.size(), &mut source_xa);
-//
-// pt_want.to_mut().at_mut(0, 0)[1] = 1;
-//
-// let k: usize = 1;
-//
-// pt_rgsw.raw_mut()[k] = 1; // X^{k}
-//
-// let mut scratch: ScratchOwned = ScratchOwned::new(
-// GGSWCiphertext::encrypt_sk_scratch_space(&module, rank, ct_rgsw.size())
-// | GLWECiphertext::decrypt_scratch_space(&module, ct_rlwe.size())
-// | GLWECiphertext::encrypt_sk_scratch_space(&module, rank, ct_rlwe.size())
-// | GLWECiphertext::external_product_inplace_scratch_space(&module, ct_rlwe.size(), ct_rgsw.size()),
-// );
-//
-// let mut sk: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
-// sk.fill_ternary_prob(0.5, &mut source_xs);
-//
-// let mut sk_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank);
-// sk_dft.dft(&module, &sk);
-//
-// ct_rgsw.encrypt_sk(
-// &module,
-// &pt_rgsw,
-// &sk_dft,
-// &mut source_xa,
-// &mut source_xe,
-// sigma,
-// scratch.borrow(),
-// );
-//
-// ct_rlwe.encrypt_sk(
-// &module,
-// &pt_want,
-// &sk_dft,
-// &mut source_xa,
-// &mut source_xe,
-// sigma,
-// scratch.borrow(),
-// );
-//
-// ct_rlwe.dft(&module, &mut ct_rlwe_dft);
-// ct_rlwe_dft.external_product_inplace(&module, &ct_rgsw, scratch.borrow());
-// ct_rlwe_dft.idft(&module, &mut ct_rlwe, scratch.borrow());
-//
-// ct_rlwe.decrypt(&module, &mut pt_have, &sk_dft, scratch.borrow());
-//
-// module.vec_znx_rotate_inplace(k as i64, &mut pt_want, 0);
-//
-// module.vec_znx_sub_ab_inplace(&mut pt_have, 0, &pt_want, 0);
-//
-// let noise_have: f64 = pt_have.data.std(0, log_base2k).log2();
-//
-// let var_gct_err_lhs: f64 = sigma * sigma;
-// let var_gct_err_rhs: f64 = 0f64;
-//
-// let var_msg: f64 = 1f64 / module.n() as f64; // X^{k}
-// let var_a0_err: f64 = sigma * sigma;
-// let var_a1_err: f64 = 1f64 / 12f64;
-//
-// let noise_want: f64 = noise_rgsw_product(
-// module.n() as f64,
-// log_base2k,
-// 0.5,
-// var_msg,
-// var_a0_err,
-// var_a1_err,
-// var_gct_err_lhs,
-// var_gct_err_rhs,
-// log_k_rlwe_in,
-// log_k_grlwe,
-// );
-//
-// assert!(
-// (noise_have - noise_want).abs() <= 0.1,
-// "{} {}",
-// noise_have,
-// noise_want
-// );
-// }
+    pt_want
+        .data
+        .fill_uniform(basek, 0, pt_want.size(), &mut source_xa);
+
+    pt_want.to_mut().at_mut(0, 0)[1] = 1;
+
+    let k: usize = 1;
+
+    pt_rgsw.raw_mut()[k] = 1; // X^{k}
+
+    let mut scratch: ScratchOwned = ScratchOwned::new(
+        GGSWCiphertext::encrypt_sk_scratch_space(&module, rank, ct_ggsw.size())
+            | GLWECiphertext::decrypt_scratch_space(&module, ct.size())
+            | GLWECiphertext::encrypt_sk_scratch_space(&module, ct.size())
+            | GLWECiphertextFourier::external_product_inplace_scratch_space(&module, ct.size(), ct_ggsw.size(), rank),
+    );
+
+    let mut sk: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
+    sk.fill_ternary_prob(0.5, &mut source_xs);
+
+    let mut sk_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank);
+    sk_dft.dft(&module, &sk);
+
+    ct_ggsw.encrypt_sk(
+        &module,
+        &pt_rgsw,
+        &sk_dft,
+        &mut source_xa,
+        &mut source_xe,
+        sigma,
+        scratch.borrow(),
+    );
+
+    ct.encrypt_sk(
+        &module,
+        &pt_want,
+        &sk_dft,
+        &mut source_xa,
+        &mut source_xe,
+        sigma,
+        scratch.borrow(),
+    );
+
+    ct.dft(&module, &mut ct_rlwe_dft);
+    ct_rlwe_dft.external_product_inplace(&module, &ct_ggsw, scratch.borrow());
+    ct_rlwe_dft.idft(&module, &mut ct, scratch.borrow());
+
+    ct.decrypt(&module, &mut pt_have, &sk_dft, scratch.borrow());
+
+    module.vec_znx_rotate_inplace(k as i64, &mut pt_want, 0);
+
+    module.vec_znx_sub_ab_inplace(&mut pt_have, 0, &pt_want, 0);
+
+    let noise_have: f64 = pt_have.data.std(0, basek).log2();
+
+    let var_gct_err_lhs: f64 = sigma * sigma;
+    let var_gct_err_rhs: f64 = 0f64;
+
+    let var_msg: f64 = 1f64 / module.n() as f64; // X^{k}
+    let var_a0_err: f64 = sigma * sigma;
+    let var_a1_err: f64 = 1f64 / 12f64;
+
+    let noise_want: f64 = noise_ggsw_gglwe_product(
+        module.n() as f64,
+        basek,
+        0.5,
+        var_msg,
+        var_a0_err,
+        var_a1_err,
+        var_gct_err_lhs,
+        var_gct_err_rhs,
+        rank as f64,
+        k_ct,
+        k_ggsw,
+    );
+
+    assert!(
+        (noise_have - noise_want).abs() <= 0.1,
+        "{} {}",
+        noise_have,
+        noise_want
+    );
+}

core/src/vec_glwe_product.rs

@@ -23,7 +23,7 @@ pub(crate) trait VecGLWEProductScratchSpace {
         Self::prod_with_glwe_scratch_space(module, res_size, res_size, rhs, rank, rank)
     }
 
-    fn prod_with_glwe_dft_scratch_space(
+    fn prod_with_glwe_fourier_scratch_space(
         module: &Module<FFT64>,
         res_size: usize,
         lhs: usize,
@@ -32,11 +32,11 @@ pub(crate) trait VecGLWEProductScratchSpace {
         rank_out: usize,
     ) -> usize {
         (Self::prod_with_glwe_scratch_space(module, res_size, lhs, rhs, rank_in, rank_out) | module.vec_znx_idft_tmp_bytes())
-            + module.bytes_of_vec_znx(rank_in, lhs)
-            + module.bytes_of_vec_znx(rank_out, res_size)
+            + module.bytes_of_vec_znx(rank_in + 1, lhs)
+            + module.bytes_of_vec_znx(rank_out + 1, res_size)
     }
 
-    fn prod_with_glwe_dft_inplace_scratch_space(module: &Module<FFT64>, res_size: usize, rhs: usize, rank: usize) -> usize {
+    fn prod_with_glwe_fourier_inplace_scratch_space(module: &Module<FFT64>, res_size: usize, rhs: usize, rank: usize) -> usize {
         (Self::prod_with_glwe_inplace_scratch_space(module, res_size, rhs, rank) | module.vec_znx_idft_tmp_bytes())
             + module.bytes_of_vec_znx(rank + 1, res_size)
     }
@@ -49,13 +49,13 @@ pub(crate) trait VecGLWEProductScratchSpace {
         rank_in: usize,
         rank_out: usize,
     ) -> usize {
-        Self::prod_with_glwe_dft_scratch_space(module, res_size, lhs, rhs, rank_in, rank_out)
+        Self::prod_with_glwe_fourier_scratch_space(module, res_size, lhs, rhs, rank_in, rank_out)
             + module.bytes_of_vec_znx_dft(rank_in + 1, lhs)
             + module.bytes_of_vec_znx_dft(rank_out + 1, res_size)
     }
 
     fn prod_with_vec_glwe_inplace_scratch_space(module: &Module<FFT64>, res_size: usize, rhs: usize, rank: usize) -> usize {
-        Self::prod_with_glwe_dft_inplace_scratch_space(module, res_size, rhs, rank)
+        Self::prod_with_glwe_fourier_inplace_scratch_space(module, res_size, rhs, rank)
             + module.bytes_of_vec_znx_dft(rank + 1, res_size)
     }
 }