1use backend::hal::{
 2    api::{ScratchOwnedAlloc, ScratchOwnedBorrow, VecZnxAlloc, VecZnxStd, VecZnxSubScalarInplace, ZnxZero},
 3    layouts::{Backend, DataRef, Module, ScalarZnx, ScratchOwned},
 4    oep::{ScratchOwnedAllocImpl, ScratchOwnedBorrowImpl, TakeVecZnxBigImpl, TakeVecZnxDftImpl},
 5};
 6
 7use crate::{GGLWECiphertext, GLWECiphertext, GLWEDecryptFamily, GLWEPlaintext, GLWESecretExec, Infos};
 8
 9impl<D: DataRef> GGLWECiphertext<D> {
10    pub fn assert_noise<B: Backend, DataSk, DataWant>(
11        self,
12        module: &Module<B>,
13        sk: &GLWESecretExec<DataSk, B>,
14        pt_want: &ScalarZnx<DataWant>,
15        max_noise: f64,
16    ) where
17        DataSk: DataRef,
18        DataWant: DataRef,
19        Module<B>: GLWEDecryptFamily<B> + VecZnxStd + VecZnxAlloc + VecZnxSubScalarInplace,
20        B: TakeVecZnxDftImpl<B> + TakeVecZnxBigImpl<B> + ScratchOwnedAllocImpl<B> + ScratchOwnedBorrowImpl<B>,
21    {
22        let digits: usize = self.digits();
23        let basek: usize = self.basek();
24        let k: usize = self.k();
25
26        let mut scratch: ScratchOwned<B> = ScratchOwned::alloc(GLWECiphertext::decrypt_scratch_space(module, basek, k));
27        let mut pt: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::alloc(module, basek, k);
28
29        (0..self.rank_in()).for_each(|col_i| {
30            (0..self.rows()).for_each(|row_i| {
31                self.at(row_i, col_i)
32                    .decrypt(&module, &mut pt, &sk, scratch.borrow());
33
34                module.vec_znx_sub_scalar_inplace(
35                    &mut pt.data,
36                    0,
37                    (digits - 1) + row_i * digits,
38                    pt_want,
39                    col_i,
40                );
41
42                let noise_have: f64 = module.vec_znx_std(basek, &pt.data, 0).log2();
43
44                assert!(
45                    noise_have <= max_noise,
46                    "noise_have: {} > max_noise: {}",
47                    noise_have,
48                    max_noise
49                );
50
51                pt.data.zero();
52            });
53        });
54    }
55}