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

poulpy_core/encryption/compressed/
ggsw_ct.rs
