1use poulpy_core::{
  2    GGSWEncryptSk, GLWEDecrypt, GLWEEncryptSk, ScratchTakeCore,
  3    layouts::{
  4        Base2K, Degree, Dnum, Dsize, GGSWLayout, GGSWPreparedFactory, GLWE, GLWELayout, GLWEPlaintext, GLWESecret,
  5        GLWESecretPrepared, GLWESecretPreparedFactory, LWEInfos, Rank, TorusPrecision,
  6    },
  7};
  8use poulpy_hal::{
  9    api::{ModuleNew, ScratchOwnedAlloc, ScratchOwnedBorrow},
 10    layouts::{Backend, Module, Scratch, ScratchOwned},
 11    source::Source,
 12};
 13use rand::RngCore;
 14
 15use crate::tfhe::bdd_arithmetic::{FheUintBlocksPrepared, GLWEBlindRotation};
 16
 17pub fn test_glwe_to_glwe_blind_rotation<BE: Backend>()
 18where
 19    Module<BE>: ModuleNew<BE>
 20        + GLWESecretPreparedFactory<BE>
 21        + GGSWPreparedFactory<BE>
 22        + GGSWEncryptSk<BE>
 23        + GLWEBlindRotation<u32, BE>
 24        + GLWEDecrypt<BE>
 25        + GLWEEncryptSk<BE>,
 26    ScratchOwned<BE>: ScratchOwnedAlloc<BE> + ScratchOwnedBorrow<BE>,
 27    Scratch<BE>: ScratchTakeCore<BE>,
 28{
 29    let n: Degree = Degree(1 << 11);
 30    let base2k: Base2K = Base2K(13);
 31    let rank: Rank = Rank(1);
 32    let k_glwe: TorusPrecision = TorusPrecision(26);
 33    let k_ggsw: TorusPrecision = TorusPrecision(39);
 34    let dnum: Dnum = Dnum(3);
 35
 36    let glwe_infos: GLWELayout = GLWELayout {
 37        n,
 38        base2k,
 39        k: k_glwe,
 40        rank,
 41    };
 42    let ggsw_infos: GGSWLayout = GGSWLayout {
 43        n,
 44        base2k,
 45        k: k_ggsw,
 46        rank,
 47        dnum,
 48        dsize: Dsize(1),
 49    };
 50
 51    let n_glwe: usize = glwe_infos.n().into();
 52
 53    let module: Module<BE> = Module::<BE>::new(n_glwe as u64);
 54    let mut source: Source = Source::new([6u8; 32]);
 55    let mut source_xs: Source = Source::new([1u8; 32]);
 56    let mut source_xa: Source = Source::new([2u8; 32]);
 57    let mut source_xe: Source = Source::new([3u8; 32]);
 58
 59    let mut scratch: ScratchOwned<BE> = ScratchOwned::alloc(1 << 22);
 60
 61    let mut sk_glwe: GLWESecret<Vec<u8>> = GLWESecret::alloc_from_infos(&glwe_infos);
 62    sk_glwe.fill_ternary_prob(0.5, &mut source_xs);
 63    let mut sk_glwe_prep: GLWESecretPrepared<Vec<u8>, BE> = GLWESecretPrepared::alloc_from_infos(&module, &glwe_infos);
 64    sk_glwe_prep.prepare(&module, &sk_glwe);
 65
 66    let mut res: GLWE<Vec<u8>> = GLWE::alloc_from_infos(&glwe_infos);
 67
 68    let mut test_glwe: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::alloc_from_infos(&glwe_infos);
 69    let mut data: Vec<i64> = vec![0i64; module.n()];
 70    data.iter_mut().enumerate().for_each(|(i, x)| *x = i as i64);
 71    test_glwe.encode_vec_i64(&data, base2k.as_usize().into());
 72
 73    let k: u32 = source.next_u32();
 74
 75    let mut k_enc_prep: FheUintBlocksPrepared<Vec<u8>, u32, BE> =
 76        FheUintBlocksPrepared::<Vec<u8>, u32, BE>::alloc(&module, &ggsw_infos);
 77    k_enc_prep.encrypt_sk(
 78        &module,
 79        k,
 80        &sk_glwe_prep,
 81        &mut source_xa,
 82        &mut source_xe,
 83        scratch.borrow(),
 84    );
 85
 86    let base: [usize; 2] = [6, 5];
 87
 88    assert_eq!(base.iter().sum::<usize>(), module.log_n());
 89
 90    // Starting bit
 91    let mut bit_start: usize = 0;
 92
 93    let mut pt: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::alloc_from_infos(&glwe_infos);
 94
 95    for _ in 0..32_usize.div_ceil(module.log_n()) {
 96        // By how many bits to left shift
 97        let mut bit_step: usize = 0;
 98
 99        for digit in base {
100            let mask: u32 = (1 << digit) - 1;
101
102            // How many bits to take
103            let bit_size: usize = (32 - bit_start).min(digit);
104
105            module.glwe_to_glwe_blind_rotation(
106                &mut res,
107                &test_glwe,
108                &k_enc_prep,
109                bit_start,
110                bit_size,
111                bit_step,
112                scratch.borrow(),
113            );
114
115            res.decrypt(&module, &mut pt, &sk_glwe_prep, scratch.borrow());
116
117            assert_eq!(
118                (((k >> bit_start) & mask) << bit_step) as i64,
119                pt.decode_coeff_i64(base2k.as_usize().into(), 0)
120            );
121
122            bit_step += digit;
123            bit_start += digit;
124
125            if bit_start >= 32 {
126                break;
127            }
128        }
129    }
130}