poulpy_hal/reference/vec_znx/
split_ring.rs

1use crate::{
2    layouts::{VecZnx, VecZnxToMut, VecZnxToRef, ZnxInfos, ZnxView, ZnxViewMut},
3    reference::znx::{ZnxRotate, ZnxSwitchRing, ZnxZero},
4};
5
6pub fn vec_znx_split_ring_tmp_bytes(n: usize) -> usize {
7    n * size_of::<i64>()
8}
9
10pub fn vec_znx_split_ring<R, A, ZNXARI>(res: &mut [R], res_col: usize, a: &A, a_col: usize, tmp: &mut [i64])
11where
12    R: VecZnxToMut,
13    A: VecZnxToRef,
14    ZNXARI: ZnxSwitchRing + ZnxRotate + ZnxZero,
15{
16    let a: VecZnx<&[u8]> = a.to_ref();
17    let a_size = a.size();
18
19    let (_n_in, _n_out) = (a.n(), res[0].to_mut().n());
20
21    #[cfg(debug_assertions)]
22    {
23        assert_eq!(tmp.len(), a.n());
24
25        assert!(
26            _n_out < _n_in,
27            "invalid a: output ring degree should be smaller"
28        );
29
30        res[1..].iter_mut().for_each(|bi| {
31            assert_eq!(
32                bi.to_mut().n(),
33                _n_out,
34                "invalid input a: all VecZnx must have the same degree"
35            )
36        });
37
38        assert!(_n_in.is_multiple_of(_n_out));
39        assert_eq!(res.len(), _n_in / _n_out);
40    }
41
42    res.iter_mut().enumerate().for_each(|(i, bi)| {
43        let mut bi: VecZnx<&mut [u8]> = bi.to_mut();
44
45        let min_size = bi.size().min(a_size);
46
47        if i == 0 {
48            for j in 0..min_size {
49                ZNXARI::znx_switch_ring(bi.at_mut(res_col, j), a.at(a_col, j));
50            }
51        } else {
52            for j in 0..min_size {
53                ZNXARI::znx_rotate(-(i as i64), tmp, a.at(a_col, j));
54                ZNXARI::znx_switch_ring(bi.at_mut(res_col, j), tmp);
55            }
56        }
57
58        for j in min_size..bi.size() {
59            ZNXARI::znx_zero(bi.at_mut(res_col, j));
60        }
61    })
62}
poulpy_hal/reference/vec_znx/split_ring.rs

poulpy_hal/reference/vec_znx/
split_ring.rs
