1use std::collections::HashMap;
  2
  3use poulpy_hal::{
  4    api::{ScratchAvailable, ScratchOwnedAlloc, ScratchOwnedBorrow, VecZnxFillUniform, VecZnxNormalizeInplace, VecZnxSubInplace},
  5    layouts::{Backend, Module, Scratch, ScratchOwned, ZnxView, ZnxViewMut},
  6    source::Source,
  7};
  8
  9use crate::{
 10    AutomorphismKeyEncryptSk, GLWEDecrypt, GLWEEncryptSk, ScratchTakeCore,
 11    encryption::SIGMA,
 12    glwe_trace::GLWETrace,
 13    layouts::{
 14        AutomorphismKey, AutomorphismKeyLayout, AutomorphismKeyPrepare, AutomorphismKeyPreparedAlloc, GLWE, GLWELayout,
 15        GLWEPlaintext, GLWESecret, GLWESecretPrepare, GLWESecretPreparedAlloc, LWEInfos,
 16        prepared::{AutomorphismKeyPrepared, GLWESecretPrepared},
 17    },
 18    noise::var_noise_gglwe_product,
 19};
 20
 21pub fn test_glwe_trace_inplace<BE: Backend>(module: &Module<BE>)
 22where
 23    Module<BE>: GLWETrace<BE>
 24        + GLWEEncryptSk<BE>
 25        + GLWEDecrypt<BE>
 26        + AutomorphismKeyEncryptSk<BE>
 27        + AutomorphismKeyPrepare<BE>
 28        + AutomorphismKeyPreparedAlloc<BE>
 29        + VecZnxFillUniform
 30        + GLWESecretPrepare<BE>
 31        + GLWESecretPreparedAlloc<BE>
 32        + VecZnxSubInplace
 33        + VecZnxNormalizeInplace<BE>,
 34    ScratchOwned<BE>: ScratchOwnedAlloc<BE> + ScratchOwnedBorrow<BE>,
 35    Scratch<BE>: ScratchAvailable + ScratchTakeCore<BE>,
 36{
 37    let base2k: usize = 8;
 38    let k: usize = 54;
 39
 40    for rank in 1_usize..3 {
 41        let n: usize = module.n();
 42        let k_autokey: usize = k + base2k;
 43
 44        let dsize: usize = 1;
 45        let dnum: usize = k.div_ceil(base2k * dsize);
 46
 47        let glwe_out_infos: GLWELayout = GLWELayout {
 48            n: n.into(),
 49            base2k: base2k.into(),
 50            k: k.into(),
 51            rank: rank.into(),
 52        };
 53
 54        let key_infos: AutomorphismKeyLayout = AutomorphismKeyLayout {
 55            n: n.into(),
 56            base2k: base2k.into(),
 57            k: k_autokey.into(),
 58            rank: rank.into(),
 59            dsize: dsize.into(),
 60            dnum: dnum.into(),
 61        };
 62
 63        let mut glwe_out: GLWE<Vec<u8>> = GLWE::alloc_from_infos(&glwe_out_infos);
 64        let mut pt_want: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::alloc_from_infos(&glwe_out_infos);
 65        let mut pt_have: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::alloc_from_infos(&glwe_out_infos);
 66
 67        let mut source_xs: Source = Source::new([0u8; 32]);
 68        let mut source_xe: Source = Source::new([0u8; 32]);
 69        let mut source_xa: Source = Source::new([0u8; 32]);
 70
 71        let mut scratch: ScratchOwned<BE> = ScratchOwned::alloc(
 72            GLWE::encrypt_sk_tmp_bytes(module, &glwe_out_infos)
 73                | GLWE::decrypt_tmp_bytes(module, &glwe_out_infos)
 74                | AutomorphismKey::encrypt_sk_tmp_bytes(module, &key_infos)
 75                | GLWE::trace_tmp_bytes(module, &glwe_out_infos, &glwe_out_infos, &key_infos),
 76        );
 77
 78        let mut sk: GLWESecret<Vec<u8>> = GLWESecret::alloc_from_infos(&glwe_out_infos);
 79        sk.fill_ternary_prob(0.5, &mut source_xs);
 80
 81        let mut sk_dft: GLWESecretPrepared<Vec<u8>, BE> = GLWESecretPrepared::alloc_from_infos(module, &sk);
 82        sk_dft.prepare(module, &sk);
 83
 84        let mut data_want: Vec<i64> = vec![0i64; n];
 85
 86        data_want
 87            .iter_mut()
 88            .for_each(|x| *x = source_xa.next_i64() & 0xFF);
 89
 90        module.vec_znx_fill_uniform(base2k, &mut pt_have.data, 0, &mut source_xa);
 91
 92        glwe_out.encrypt_sk(
 93            module,
 94            &pt_have,
 95            &sk_dft,
 96            &mut source_xa,
 97            &mut source_xe,
 98            scratch.borrow(),
 99        );
100
101        let mut auto_keys: HashMap<i64, AutomorphismKeyPrepared<Vec<u8>, BE>> = HashMap::new();
102        let gal_els: Vec<i64> = GLWE::trace_galois_elements(module);
103        let mut tmp: AutomorphismKey<Vec<u8>> = AutomorphismKey::alloc_from_infos(&key_infos);
104        gal_els.iter().for_each(|gal_el| {
105            tmp.encrypt_sk(
106                module,
107                *gal_el,
108                &sk,
109                &mut source_xa,
110                &mut source_xe,
111                scratch.borrow(),
112            );
113            let mut atk_prepared: AutomorphismKeyPrepared<Vec<u8>, BE> = AutomorphismKeyPrepared::alloc_from_infos(module, &tmp);
114            atk_prepared.prepare(module, &tmp, scratch.borrow());
115            auto_keys.insert(*gal_el, atk_prepared);
116        });
117
118        glwe_out.trace_inplace(module, 0, 5, &auto_keys, scratch.borrow());
119        glwe_out.trace_inplace(module, 5, module.log_n(), &auto_keys, scratch.borrow());
120
121        (0..pt_want.size()).for_each(|i| pt_want.data.at_mut(0, i)[0] = pt_have.data.at(0, i)[0]);
122
123        glwe_out.decrypt(module, &mut pt_have, &sk_dft, scratch.borrow());
124
125        module.vec_znx_sub_inplace(&mut pt_want.data, 0, &pt_have.data, 0);
126        module.vec_znx_normalize_inplace(base2k, &mut pt_want.data, 0, scratch.borrow());
127
128        let noise_have: f64 = pt_want.std().log2();
129
130        let mut noise_want: f64 = var_noise_gglwe_product(
131            n as f64,
132            base2k,
133            0.5,
134            0.5,
135            1.0 / 12.0,
136            SIGMA * SIGMA,
137            0.0,
138            rank as f64,
139            k,
140            k_autokey,
141        );
142        noise_want += SIGMA * SIGMA * (-2.0 * (k) as f64).exp2();
143        noise_want += n as f64 * 1.0 / 12.0 * 0.5 * rank as f64 * (-2.0 * (k) as f64).exp2();
144        noise_want = noise_want.sqrt().log2();
145
146        assert!(
147            (noise_have - noise_want).abs() < 1.0,
148            "{noise_have} > {noise_want}"
149        );
150    }
151}