1use std::collections::HashMap;
  2
  3use itertools::Itertools;
  4use poulpy_hal::{
  5    api::{ScratchAvailable, ScratchOwnedAlloc, ScratchOwnedBorrow},
  6    layouts::{Backend, Module, Scratch, ScratchOwned},
  7    source::Source,
  8};
  9
 10use crate::{
 11    GLWEAutomorphismKeyEncryptSk, GLWEDecrypt, GLWEEncryptSk, GLWENoise, GLWEPacking, GLWERotate, GLWESub, ScratchTakeCore,
 12    layouts::{
 13        GLWE, GLWEAutomorphismKey, GLWEAutomorphismKeyLayout, GLWEAutomorphismKeyPreparedFactory, GLWELayout, GLWEPlaintext,
 14        GLWESecret, GLWESecretPreparedFactory,
 15        prepared::{GLWEAutomorphismKeyPrepared, GLWESecretPrepared},
 16    },
 17};
 18
 19pub fn test_glwe_packing<BE: Backend>(module: &Module<BE>)
 20where
 21    Module<BE>: GLWEEncryptSk<BE>
 22        + GLWEAutomorphismKeyEncryptSk<BE>
 23        + GLWEAutomorphismKeyPreparedFactory<BE>
 24        + GLWEPacking<BE>
 25        + GLWESecretPreparedFactory<BE>
 26        + GLWESub
 27        + GLWEDecrypt<BE>
 28        + GLWERotate<BE>
 29        + GLWENoise<BE>,
 30    ScratchOwned<BE>: ScratchOwnedAlloc<BE> + ScratchOwnedBorrow<BE>,
 31    Scratch<BE>: ScratchAvailable + ScratchTakeCore<BE>,
 32{
 33    let mut source_xs: Source = Source::new([0u8; 32]);
 34    let mut source_xe: Source = Source::new([0u8; 32]);
 35    let mut source_xa: Source = Source::new([0u8; 32]);
 36
 37    let n: usize = module.n();
 38    let out_base2k: usize = 15;
 39    let key_base2k: usize = 10;
 40    let k_ct: usize = 36;
 41    let pt_k: usize = out_base2k;
 42    let rank: usize = 3;
 43    let dsize: usize = 1;
 44    let k_ksk: usize = k_ct + key_base2k * dsize;
 45
 46    let dnum: usize = k_ct.div_ceil(key_base2k * dsize);
 47
 48    let glwe_out_infos: GLWELayout = GLWELayout {
 49        n: n.into(),
 50        base2k: out_base2k.into(),
 51        k: k_ct.into(),
 52        rank: rank.into(),
 53    };
 54
 55    let key_infos: GLWEAutomorphismKeyLayout = GLWEAutomorphismKeyLayout {
 56        n: n.into(),
 57        base2k: key_base2k.into(),
 58        k: k_ksk.into(),
 59        rank: rank.into(),
 60        dsize: dsize.into(),
 61        dnum: dnum.into(),
 62    };
 63
 64    let mut scratch: ScratchOwned<BE> = ScratchOwned::alloc(
 65        GLWE::encrypt_sk_tmp_bytes(module, &glwe_out_infos)
 66            .max(GLWEAutomorphismKey::encrypt_sk_tmp_bytes(module, &key_infos))
 67            .max(module.glwe_pack_tmp_bytes(&glwe_out_infos, &key_infos)),
 68    );
 69
 70    let mut sk: GLWESecret<Vec<u8>> = GLWESecret::alloc_from_infos(&glwe_out_infos);
 71    sk.fill_ternary_prob(0.5, &mut source_xs);
 72
 73    let mut sk_prep: GLWESecretPrepared<Vec<u8>, BE> = GLWESecretPrepared::alloc_from_infos(module, &sk);
 74    sk_prep.prepare(module, &sk);
 75
 76    let mut pt: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::alloc_from_infos(&glwe_out_infos);
 77    let mut data: Vec<i64> = vec![0i64; n];
 78    data.iter_mut().enumerate().for_each(|(i, x)| {
 79        *x = i as i64;
 80    });
 81
 82    pt.encode_vec_i64(&data, pt_k.into());
 83
 84    let gal_els: Vec<i64> = module.glwe_pack_galois_elements();
 85
 86    let mut auto_keys: HashMap<i64, GLWEAutomorphismKeyPrepared<Vec<u8>, BE>> = HashMap::new();
 87    let mut tmp: GLWEAutomorphismKey<Vec<u8>> = GLWEAutomorphismKey::alloc_from_infos(&key_infos);
 88    gal_els.iter().for_each(|gal_el| {
 89        tmp.encrypt_sk(module, *gal_el, &sk, &mut source_xa, &mut source_xe, scratch.borrow());
 90        let mut atk_prepared: GLWEAutomorphismKeyPrepared<Vec<u8>, BE> =
 91            GLWEAutomorphismKeyPrepared::alloc_from_infos(module, &tmp);
 92        atk_prepared.prepare(module, &tmp, scratch.borrow());
 93        auto_keys.insert(*gal_el, atk_prepared);
 94    });
 95
 96    let mut cts = (0..n)
 97        .step_by(5)
 98        .map(|_| {
 99            let mut ct = GLWE::alloc_from_infos(&glwe_out_infos);
100            ct.encrypt_sk(module, &pt, &sk_prep, &mut source_xa, &mut source_xe, scratch.borrow());
101            module.glwe_rotate_inplace(-5, &mut pt, scratch.borrow()); // X^-batch * pt
102            ct
103        })
104        .collect_vec();
105
106    let mut cts_map: HashMap<usize, &mut GLWE<Vec<u8>>> = HashMap::new();
107
108    for (i, ct) in cts.iter_mut().enumerate() {
109        cts_map.insert(5 * i, ct);
110    }
111
112    let mut res: GLWE<Vec<u8>> = GLWE::alloc_from_infos(&glwe_out_infos);
113
114    module.glwe_pack(&mut res, cts_map, 0, &auto_keys, scratch.borrow());
115
116    let mut pt_want: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::alloc_from_infos(&glwe_out_infos);
117    let mut data: Vec<i64> = vec![0i64; n];
118    data.iter_mut().enumerate().for_each(|(i, x)| {
119        if i.is_multiple_of(5) {
120            *x = i as i64;
121        }
122    });
123
124    pt_want.encode_vec_i64(&data, pt_k.into());
125
126    assert!(res.noise(module, &pt_want, &sk_prep, scratch.borrow()).std().log2() <= ((k_ct - out_base2k) as f64));
127}