1use std::collections::HashMap;
  2
  3use poulpy_hal::{
  4    api::{
  5        DFT, IDFTConsume, ScratchOwnedAlloc, ScratchOwnedBorrow, SvpApplyInplace, SvpPPolAlloc, SvpPPolAllocBytes, SvpPrepare,
  6        VecZnxAddInplace, VecZnxAddNormal, VecZnxAddScalarInplace, VecZnxAutomorphism, VecZnxAutomorphismInplace,
  7        VecZnxBigAddInplace, VecZnxBigAddSmallInplace, VecZnxBigAllocBytes, VecZnxBigAutomorphismInplace, VecZnxBigNormalize,
  8        VecZnxBigNormalizeTmpBytes, VecZnxBigSubSmallBInplace, VecZnxCopy, VecZnxDftAllocBytes, VecZnxFillUniform,
  9        VecZnxNegateInplace, VecZnxNormalize, VecZnxNormalizeInplace, VecZnxNormalizeTmpBytes, VecZnxRotate, VecZnxRotateInplace,
 10        VecZnxRshInplace, VecZnxSub, VecZnxSubABInplace, VecZnxSwithcDegree, VmpApplyDftToDft, VmpApplyDftToDftAdd,
 11        VmpApplyDftToDftTmpBytes, VmpPMatAlloc, VmpPrepare,
 12    },
 13    layouts::{Backend, Module, ScratchOwned},
 14    oep::{
 15        ScratchAvailableImpl, ScratchOwnedAllocImpl, ScratchOwnedBorrowImpl, TakeScalarZnxImpl, TakeSvpPPolImpl,
 16        TakeVecZnxBigImpl, TakeVecZnxDftImpl, TakeVecZnxImpl,
 17    },
 18    source::Source,
 19};
 20
 21use crate::{
 22    GLWEOperations, GLWEPacker,
 23    layouts::{
 24        GGLWEAutomorphismKey, GLWECiphertext, GLWEPlaintext, GLWESecret,
 25        prepared::{GGLWEAutomorphismKeyPrepared, GLWESecretPrepared, PrepareAlloc},
 26    },
 27};
 28
 29pub fn test_glwe_packing<B>(module: &Module<B>)
 30where
 31    Module<B>: VecZnxDftAllocBytes
 32        + VecZnxAutomorphism
 33        + VecZnxBigAutomorphismInplace<B>
 34        + VecZnxBigSubSmallBInplace<B>
 35        + VecZnxNegateInplace
 36        + VecZnxRshInplace
 37        + VecZnxRotateInplace
 38        + VecZnxBigNormalize<B>
 39        + DFT<B>
 40        + VecZnxRotate
 41        + SvpApplyInplace<B>
 42        + IDFTConsume<B>
 43        + VecZnxFillUniform
 44        + VecZnxSubABInplace
 45        + VecZnxAddInplace
 46        + VecZnxNormalizeInplace<B>
 47        + VecZnxAddNormal
 48        + VecZnxNormalize<B>
 49        + VecZnxSub
 50        + SvpPrepare<B>
 51        + SvpPPolAllocBytes
 52        + SvpPPolAlloc<B>
 53        + VecZnxBigAllocBytes
 54        + VecZnxBigAddInplace<B>
 55        + VecZnxBigAddSmallInplace<B>
 56        + VecZnxNormalizeTmpBytes
 57        + VecZnxAddScalarInplace
 58        + VmpPMatAlloc<B>
 59        + VmpPrepare<B>
 60        + VmpApplyDftToDftTmpBytes
 61        + VmpApplyDftToDft<B>
 62        + VmpApplyDftToDftAdd<B>
 63        + VecZnxBigNormalizeTmpBytes
 64        + VecZnxSwithcDegree
 65        + VecZnxAutomorphismInplace
 66        + VecZnxCopy,
 67    B: Backend
 68        + TakeVecZnxDftImpl<B>
 69        + TakeVecZnxBigImpl<B>
 70        + TakeSvpPPolImpl<B>
 71        + ScratchOwnedAllocImpl<B>
 72        + ScratchOwnedBorrowImpl<B>
 73        + ScratchAvailableImpl<B>
 74        + TakeScalarZnxImpl<B>
 75        + TakeVecZnxImpl<B>,
 76{
 77    let mut source_xs: Source = Source::new([0u8; 32]);
 78    let mut source_xe: Source = Source::new([0u8; 32]);
 79    let mut source_xa: Source = Source::new([0u8; 32]);
 80
 81    let n: usize = module.n();
 82    let basek: usize = 18;
 83    let k_ct: usize = 36;
 84    let pt_k: usize = 18;
 85    let rank: usize = 3;
 86    let digits: usize = 1;
 87    let k_ksk: usize = k_ct + basek * digits;
 88
 89    let rows: usize = k_ct.div_ceil(basek * digits);
 90
 91    let mut scratch: ScratchOwned<B> = ScratchOwned::alloc(
 92        GLWECiphertext::encrypt_sk_scratch_space(module, basek, k_ct)
 93            | GGLWEAutomorphismKey::encrypt_sk_scratch_space(module, basek, k_ksk, rank)
 94            | GLWEPacker::scratch_space(module, basek, k_ct, k_ksk, digits, rank),
 95    );
 96
 97    let mut sk: GLWESecret<Vec<u8>> = GLWESecret::alloc(n, rank);
 98    sk.fill_ternary_prob(0.5, &mut source_xs);
 99    let sk_dft: GLWESecretPrepared<Vec<u8>, B> = sk.prepare_alloc(module, scratch.borrow());
100
101    let mut pt: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::alloc(n, basek, k_ct);
102    let mut data: Vec<i64> = vec![0i64; n];
103    data.iter_mut().enumerate().for_each(|(i, x)| {
104        *x = i as i64;
105    });
106
107    pt.encode_vec_i64(&data, pt_k);
108
109    let gal_els: Vec<i64> = GLWEPacker::galois_elements(module);
110
111    let mut auto_keys: HashMap<i64, GGLWEAutomorphismKeyPrepared<Vec<u8>, B>> = HashMap::new();
112    let mut tmp: GGLWEAutomorphismKey<Vec<u8>> = GGLWEAutomorphismKey::alloc(n, basek, k_ksk, rows, digits, rank);
113    gal_els.iter().for_each(|gal_el| {
114        tmp.encrypt_sk(
115            module,
116            *gal_el,
117            &sk,
118            &mut source_xa,
119            &mut source_xe,
120            scratch.borrow(),
121        );
122        let atk_prepared: GGLWEAutomorphismKeyPrepared<Vec<u8>, B> = tmp.prepare_alloc(module, scratch.borrow());
123        auto_keys.insert(*gal_el, atk_prepared);
124    });
125
126    let log_batch: usize = 0;
127
128    let mut packer: GLWEPacker = GLWEPacker::new(n, log_batch, basek, k_ct, rank);
129
130    let mut ct: GLWECiphertext<Vec<u8>> = GLWECiphertext::alloc(n, basek, k_ct, rank);
131
132    ct.encrypt_sk(
133        module,
134        &pt,
135        &sk_dft,
136        &mut source_xa,
137        &mut source_xe,
138        scratch.borrow(),
139    );
140
141    let log_n: usize = module.log_n();
142
143    (0..n >> log_batch).for_each(|i| {
144        ct.encrypt_sk(
145            module,
146            &pt,
147            &sk_dft,
148            &mut source_xa,
149            &mut source_xe,
150            scratch.borrow(),
151        );
152
153        pt.rotate_inplace(module, -(1 << log_batch)); // X^-batch * pt
154
155        if reverse_bits_msb(i, log_n as u32).is_multiple_of(5) {
156            packer.add(module, Some(&ct), &auto_keys, scratch.borrow());
157        } else {
158            packer.add(
159                module,
160                None::<&GLWECiphertext<Vec<u8>>>,
161                &auto_keys,
162                scratch.borrow(),
163            )
164        }
165    });
166
167    let mut res = GLWECiphertext::alloc(n, basek, k_ct, rank);
168    packer.flush(module, &mut res);
169
170    let mut pt_want: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::alloc(n, basek, k_ct);
171    let mut data: Vec<i64> = vec![0i64; n];
172    data.iter_mut().enumerate().for_each(|(i, x)| {
173        if i.is_multiple_of(5) {
174            *x = reverse_bits_msb(i, log_n as u32) as i64;
175        }
176    });
177
178    pt_want.encode_vec_i64(&data, pt_k);
179
180    res.decrypt(module, &mut pt, &sk_dft, scratch.borrow());
181
182    pt.sub_inplace_ab(module, &pt_want);
183
184    let noise_have: f64 = pt.std().log2();
185    // println!("noise_have: {}", noise_have);
186    assert!(
187        noise_have < -((k_ct - basek) as f64),
188        "noise: {}",
189        noise_have
190    );
191}
192
193#[inline(always)]
194fn reverse_bits_msb(x: usize, n: u32) -> usize {
195    x.reverse_bits() >> (usize::BITS - n)
196}