poulpy_core/encryption/compressed/
ggsw_ct.rs

1use poulpy_hal::{
2    api::{
3        ScratchAvailable, SvpApplyDftToDftInplace, TakeVecZnx, TakeVecZnxDft, VecZnxAddInplace, VecZnxAddNormal,
4        VecZnxAddScalarInplace, VecZnxBigNormalize, VecZnxDftAllocBytes, VecZnxDftApply, VecZnxFillUniform,
5        VecZnxIdftApplyConsume, VecZnxNormalize, VecZnxNormalizeInplace, VecZnxNormalizeTmpBytes, VecZnxSub, VecZnxSubInplace,
6    },
7    layouts::{Backend, DataMut, DataRef, Module, ScalarZnx, Scratch, ZnxZero},
8    source::Source,
9};
10
11use crate::{
12    TakeGLWEPt,
13    encryption::{SIGMA, glwe_encrypt_sk_internal},
14    layouts::{
15        GGSWCiphertext, GGSWInfos, GLWEInfos, LWEInfos, compressed::GGSWCiphertextCompressed, prepared::GLWESecretPrepared,
16    },
17};
18
19impl GGSWCiphertextCompressed<Vec<u8>> {
20    pub fn encrypt_sk_scratch_space<B: Backend, A>(module: &Module<B>, infos: &A) -> usize
21    where
22        A: GGSWInfos,
23        Module<B>: VecZnxNormalizeTmpBytes + VecZnxDftAllocBytes,
24    {
25        GGSWCiphertext::encrypt_sk_scratch_space(module, infos)
26    }
27}
28
29impl<DataSelf: DataMut> GGSWCiphertextCompressed<DataSelf> {
30    #[allow(clippy::too_many_arguments)]
31    pub fn encrypt_sk<DataPt: DataRef, DataSk: DataRef, B: Backend>(
32        &mut self,
33        module: &Module<B>,
34        pt: &ScalarZnx<DataPt>,
35        sk: &GLWESecretPrepared<DataSk, B>,
36        seed_xa: [u8; 32],
37        source_xe: &mut Source,
38        scratch: &mut Scratch<B>,
39    ) where
40        Module<B>: VecZnxAddScalarInplace
41            + VecZnxDftAllocBytes
42            + VecZnxBigNormalize<B>
43            + VecZnxDftApply<B>
44            + SvpApplyDftToDftInplace<B>
45            + VecZnxIdftApplyConsume<B>
46            + VecZnxNormalizeTmpBytes
47            + VecZnxFillUniform
48            + VecZnxSubInplace
49            + VecZnxAddInplace
50            + VecZnxNormalizeInplace<B>
51            + VecZnxAddNormal
52            + VecZnxNormalize<B>
53            + VecZnxSub,
54        Scratch<B>: TakeVecZnxDft<B> + ScratchAvailable + TakeVecZnx,
55    {
56        #[cfg(debug_assertions)]
57        {
58            use poulpy_hal::layouts::ZnxInfos;
59
60            assert_eq!(self.rank(), sk.rank());
61            assert_eq!(self.n(), sk.n());
62            assert_eq!(pt.n() as u32, sk.n());
63        }
64
65        let base2k: usize = self.base2k().into();
66        let rank: usize = self.rank().into();
67        let cols: usize = rank + 1;
68        let digits: usize = self.digits().into();
69
70        let (mut tmp_pt, scratch_1) = scratch.take_glwe_pt(&self.glwe_layout());
71
72        let mut source = Source::new(seed_xa);
73
74        self.seed = vec![[0u8; 32]; self.rows().0 as usize * cols];
75
76        (0..self.rows().into()).for_each(|row_i| {
77            tmp_pt.data.zero();
78
79            // Adds the scalar_znx_pt to the i-th limb of the vec_znx_pt
80            module.vec_znx_add_scalar_inplace(&mut tmp_pt.data, 0, (digits - 1) + row_i * digits, pt, 0);
81            module.vec_znx_normalize_inplace(base2k, &mut tmp_pt.data, 0, scratch_1);
82
83            (0..rank + 1).for_each(|col_j| {
84                // rlwe encrypt of vec_znx_pt into vec_znx_ct
85
86                let (seed, mut source_xa_tmp) = source.branch();
87
88                self.seed[row_i * cols + col_j] = seed;
89
90                glwe_encrypt_sk_internal(
91                    module,
92                    self.base2k().into(),
93                    self.k().into(),
94                    &mut self.at_mut(row_i, col_j).data,
95                    cols,
96                    true,
97                    Some((&tmp_pt, col_j)),
98                    sk,
99                    &mut source_xa_tmp,
100                    source_xe,
101                    SIGMA,
102                    scratch_1,
103                );
104            });
105        });
106    }
107}
poulpy_core/encryption/compressed/ggsw_ct.rs

poulpy_core/encryption/compressed/
ggsw_ct.rs
