1use backend::hal::{
  2    api::{
  3        ScratchOwnedAlloc, ScratchOwnedBorrow, VecZnxAddNormal, VecZnxAddScalarInplace, VecZnxEncodeCoeffsi64, VecZnxFillUniform,
  4        VecZnxRotateInplace, VecZnxSub, VecZnxSwithcDegree, VmpPMatAlloc, VmpPMatPrepare, ZnxView,
  5    },
  6    layouts::{Backend, Module, ScratchOwned},
  7    oep::{
  8        ScratchAvailableImpl, ScratchOwnedAllocImpl, ScratchOwnedBorrowImpl, TakeVecZnxBigImpl, TakeVecZnxDftImpl,
  9        TakeVecZnxDftSliceImpl, TakeVecZnxImpl, TakeVecZnxSliceImpl, VecZnxBigAllocBytesImpl, VecZnxDftAllocBytesImpl,
 10    },
 11};
 12use sampling::source::Source;
 13
 14use crate::{
 15    BlindRotationKeyCGGI, BlindRotationKeyCGGIExec, BlindRotationKeyCGGIExecLayoutFamily, CCGIBlindRotationFamily, Infos,
 16    LookUpTable, cggi_blind_rotate, cggi_blind_rotate_scratch_space,
 17    layouts::{
 18        GLWECiphertext, GLWEPlaintext, GLWESecret, LWECiphertext, LWECiphertextToRef, LWEPlaintext, LWESecret,
 19        prepared::GLWESecretExec,
 20    },
 21    mod_switch_2n,
 22};
 23
 24use crate::trait_families::{GLWEDecryptFamily, GLWESecretExecModuleFamily};
 25
 26pub(crate) trait CGGITestModuleFamily<B: Backend> = CCGIBlindRotationFamily<B>
 27    + GLWESecretExecModuleFamily<B>
 28    + GLWEDecryptFamily<B>
 29    + BlindRotationKeyCGGIExecLayoutFamily<B>
 30    + VecZnxFillUniform
 31    + VecZnxAddNormal
 32    + VecZnxAddScalarInplace
 33    + VecZnxEncodeCoeffsi64
 34    + VecZnxRotateInplace
 35    + VecZnxSwithcDegree
 36    + VecZnxSub
 37    + VmpPMatAlloc<B>
 38    + VmpPMatPrepare<B>;
 39pub(crate) trait CGGITestScratchFamily<B: Backend> = VecZnxDftAllocBytesImpl<B>
 40    + VecZnxBigAllocBytesImpl<B>
 41    + ScratchOwnedAllocImpl<B>
 42    + ScratchOwnedBorrowImpl<B>
 43    + TakeVecZnxDftImpl<B>
 44    + TakeVecZnxBigImpl<B>
 45    + TakeVecZnxDftSliceImpl<B>
 46    + ScratchAvailableImpl<B>
 47    + TakeVecZnxImpl<B>
 48    + TakeVecZnxSliceImpl<B>;
 49
 50pub(crate) fn blind_rotatio_test<B: Backend>(module: &Module<B>, n_lwe: usize, block_size: usize, extension_factor: usize)
 51where
 52    Module<B>: CGGITestModuleFamily<B>,
 53    B: CGGITestScratchFamily<B>,
 54{
 55    let n: usize = module.n();
 56    let basek: usize = 19;
 57    let k_lwe: usize = 24;
 58    let k_brk: usize = 3 * basek;
 59    let rows_brk: usize = 2; // Ensures first limb is noise-free.
 60    let k_lut: usize = 1 * basek;
 61    let k_res: usize = 2 * basek;
 62    let rank: usize = 1;
 63
 64    let message_modulus: usize = 1 << 4;
 65
 66    let mut source_xs: Source = Source::new([2u8; 32]);
 67    let mut source_xe: Source = Source::new([2u8; 32]);
 68    let mut source_xa: Source = Source::new([1u8; 32]);
 69
 70    let mut sk_glwe: GLWESecret<Vec<u8>> = GLWESecret::alloc(n, rank);
 71    sk_glwe.fill_ternary_prob(0.5, &mut source_xs);
 72    let sk_glwe_dft: GLWESecretExec<Vec<u8>, B> = GLWESecretExec::from(module, &sk_glwe);
 73
 74    let mut sk_lwe: LWESecret<Vec<u8>> = LWESecret::alloc(n_lwe);
 75    sk_lwe.fill_binary_block(block_size, &mut source_xs);
 76
 77    let mut scratch: ScratchOwned<B> = ScratchOwned::<B>::alloc(BlindRotationKeyCGGI::generate_from_sk_scratch_space(
 78        module, n, basek, k_brk, rank,
 79    ));
 80
 81    let mut scratch_br: ScratchOwned<B> = ScratchOwned::<B>::alloc(cggi_blind_rotate_scratch_space(
 82        module,
 83        n,
 84        block_size,
 85        extension_factor,
 86        basek,
 87        k_res,
 88        k_brk,
 89        rows_brk,
 90        rank,
 91    ));
 92
 93    let mut brk: BlindRotationKeyCGGI<Vec<u8>> = BlindRotationKeyCGGI::alloc(n, n_lwe, basek, k_brk, rows_brk, rank);
 94
 95    brk.generate_from_sk(
 96        module,
 97        &sk_glwe_dft,
 98        &sk_lwe,
 99        &mut source_xa,
100        &mut source_xe,
101        3.2,
102        scratch.borrow(),
103    );
104
105    let mut lwe: LWECiphertext<Vec<u8>> = LWECiphertext::alloc(n_lwe, basek, k_lwe);
106
107    let mut pt_lwe: LWEPlaintext<Vec<u8>> = LWEPlaintext::alloc(basek, k_lwe);
108
109    let x: i64 = 2;
110    let bits: usize = 8;
111
112    module.encode_coeff_i64(basek, &mut pt_lwe.data, 0, bits, 0, x, bits);
113
114    lwe.encrypt_sk(
115        module,
116        &pt_lwe,
117        &sk_lwe,
118        &mut source_xa,
119        &mut source_xe,
120        3.2,
121    );
122
123    let mut f: Vec<i64> = vec![0i64; message_modulus];
124    f.iter_mut()
125        .enumerate()
126        .for_each(|(i, x)| *x = 2 * (i as i64) + 1);
127
128    let mut lut: LookUpTable = LookUpTable::alloc(n, basek, k_lut, extension_factor);
129    lut.set(module, &f, message_modulus);
130
131    let mut res: GLWECiphertext<Vec<u8>> = GLWECiphertext::alloc(n, basek, k_res, rank);
132
133    let brk_exec: BlindRotationKeyCGGIExec<Vec<u8>, B> = BlindRotationKeyCGGIExec::from(module, &brk, scratch_br.borrow());
134
135    cggi_blind_rotate(module, &mut res, &lwe, &lut, &brk_exec, scratch_br.borrow());
136
137    let mut pt_have: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::alloc(n, basek, k_res);
138
139    res.decrypt(module, &mut pt_have, &sk_glwe_dft, scratch.borrow());
140
141    let mut lwe_2n: Vec<i64> = vec![0i64; lwe.n() + 1]; // TODO: from scratch space
142
143    mod_switch_2n(
144        2 * lut.domain_size(),
145        &mut lwe_2n,
146        &lwe.to_ref(),
147        lut.rotation_direction(),
148    );
149
150    let pt_want: i64 = (lwe_2n[0]
151        + lwe_2n[1..]
152            .iter()
153            .zip(sk_lwe.data.at(0, 0))
154            .map(|(x, y)| x * y)
155            .sum::<i64>())
156        & (2 * lut.domain_size() - 1) as i64;
157
158    lut.rotate(module, pt_want);
159
160    // First limb should be exactly equal (test are parameterized such that the noise does not reach
161    // the first limb)
162    assert_eq!(pt_have.data.at(0, 0), lut.data[0].at(0, 0));
163}