1use std::time::Instant;
  2
  3use backend::{Encoding, FFT64, Module, ScalarZnx, ScratchOwned, Stats, VecZnxOps, ZnxView, ZnxViewMut};
  4use sampling::source::Source;
  5
  6use crate::{
  7    FourierGLWESecret, GLWECiphertext, GLWEPlaintext, GLWESecret, Infos, LWECiphertext, LWESecret,
  8    blind_rotation::{
  9        ccgi::{cggi_blind_rotate, cggi_blind_rotate_scratch_space, negate_and_mod_switch_2n},
 10        key::BlindRotationKeyCGGI,
 11        lut::LookUpTable,
 12    },
 13    lwe::{LWEPlaintext, ciphertext::LWECiphertextToRef},
 14};
 15
 16#[test]
 17fn blind_rotation() {
 18    let module: Module<FFT64> = Module::<FFT64>::new(2048);
 19    let basek: usize = 18;
 20
 21    let n_lwe: usize = 1071;
 22
 23    let k_lwe: usize = 24;
 24    let k_brk: usize = 3 * basek;
 25    let rows_brk: usize = 2;
 26    let k_lut: usize = 2 * basek;
 27    let rank: usize = 1;
 28    let block_size: usize = 7;
 29
 30    let extension_factor: usize = 2;
 31
 32    let message_modulus: usize = 1 << 6;
 33
 34    let mut source_xs: Source = Source::new([1u8; 32]);
 35    let mut source_xe: Source = Source::new([1u8; 32]);
 36    let mut source_xa: Source = Source::new([1u8; 32]);
 37
 38    let mut sk_glwe: GLWESecret<Vec<u8>> = GLWESecret::alloc(&module, rank);
 39    sk_glwe.fill_ternary_prob(0.5, &mut source_xs);
 40    let sk_glwe_dft: FourierGLWESecret<Vec<u8>, FFT64> = FourierGLWESecret::from(&module, &sk_glwe);
 41
 42    let mut sk_lwe: LWESecret<Vec<u8>> = LWESecret::alloc(n_lwe);
 43    sk_lwe.fill_binary_block(block_size, &mut source_xs);
 44
 45    sk_lwe.data.raw_mut()[0] = 0;
 46
 47    println!("sk_lwe: {:?}", sk_lwe.data.raw());
 48
 49    let mut scratch: ScratchOwned = ScratchOwned::new(
 50        BlindRotationKeyCGGI::generate_from_sk_scratch_space(&module, basek, k_brk, rank)
 51            | cggi_blind_rotate_scratch_space(
 52                &module,
 53                extension_factor,
 54                basek,
 55                k_lut,
 56                k_brk,
 57                rows_brk,
 58                rank,
 59            ),
 60    );
 61
 62    let start: Instant = Instant::now();
 63    let mut brk: BlindRotationKeyCGGI<FFT64> = BlindRotationKeyCGGI::allocate(&module, n_lwe, basek, k_brk, rows_brk, rank);
 64
 65    brk.generate_from_sk(
 66        &module,
 67        &sk_glwe_dft,
 68        &sk_lwe,
 69        &mut source_xa,
 70        &mut source_xe,
 71        3.2,
 72        scratch.borrow(),
 73    );
 74
 75    let duration: std::time::Duration = start.elapsed();
 76    println!("brk-gen: {} ms", duration.as_millis());
 77
 78    let mut lwe: LWECiphertext<Vec<u8>> = LWECiphertext::alloc(n_lwe, basek, k_lwe);
 79
 80    let mut pt_lwe: LWEPlaintext<Vec<u8>> = LWEPlaintext::alloc(basek, k_lwe);
 81
 82    let x: i64 = 1;
 83    let bits: usize = 8;
 84
 85    pt_lwe.data.encode_coeff_i64(0, basek, bits, 0, x, bits);
 86
 87    println!("{}", pt_lwe.data);
 88
 89    lwe.encrypt_sk(&pt_lwe, &sk_lwe, &mut source_xa, &mut source_xe, 3.2);
 90
 91    lwe.decrypt(&mut pt_lwe, &sk_lwe);
 92
 93    println!("{}", pt_lwe.data);
 94
 95    fn lut_fn(x: i64) -> i64 {
 96        2 * x + 1
 97    }
 98
 99    let mut lut: LookUpTable = LookUpTable::alloc(&module, basek, k_lut, extension_factor);
100    lut.set(&module, lut_fn, message_modulus);
101
102    let mut res: GLWECiphertext<Vec<u8>> = GLWECiphertext::alloc(&module, basek, k_lut, rank);
103
104    let start: Instant = Instant::now();
105    (0..1).for_each(|_| {
106        cggi_blind_rotate(&module, &mut res, &lwe, &lut, &brk, scratch.borrow());
107    });
108
109    let duration: std::time::Duration = start.elapsed();
110    println!("blind-rotate: {} ms", duration.as_millis());
111
112    let mut pt_have: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::alloc(&module, basek, k_lut);
113
114    res.decrypt(&module, &mut pt_have, &sk_glwe_dft, scratch.borrow());
115
116    println!("pt_have: {}", pt_have.data);
117
118    let mut lwe_2n: Vec<i64> = vec![0i64; lwe.n() + 1]; // TODO: from scratch space
119
120    negate_and_mod_switch_2n(2 * lut.domain_size(), &mut lwe_2n, &lwe.to_ref());
121
122    let pt_want: i64 = (lwe_2n[0]
123        + lwe_2n[1..]
124            .iter()
125            .zip(sk_lwe.data.at(0, 0))
126            .map(|(x, y)| x * y)
127            .sum::<i64>())
128        % (2 * lut.domain_size()) as i64;
129
130    println!("pt_want: {}", pt_want);
131
132    lut.rotate(pt_want);
133
134    lut.data.iter().for_each(|d| {
135        println!("{}", d);
136    });
137
138    // First limb should be exactly equal (test are parameterized such that the noise does not reach
139    // the first limb)
140    // assert_eq!(pt_have.data.at_mut(0, 0), lut.data[0].at_mut(0, 0));
141
142    // Then checks the noise
143    module.vec_znx_sub_ab_inplace(&mut lut.data[0], 0, &pt_have.data, 0);
144    let noise: f64 = lut.data[0].std(0, basek);
145    println!("noise: {}", noise);
146}