poulpy_core/encryption/
lwe_ksk.rs

1use poulpy_hal::{
2    api::{
3        ScratchAvailable, SvpApplyInplace, SvpPPolAllocBytes, SvpPrepare, TakeScalarZnx, TakeVecZnx, TakeVecZnxDft,
4        VecZnxAddInplace, VecZnxAddNormal, VecZnxAddScalarInplace, VecZnxAutomorphismInplace, VecZnxBigNormalize,
5        VecZnxDftAllocBytes, VecZnxDftFromVecZnx, VecZnxDftToVecZnxBigConsume, VecZnxFillUniform, VecZnxNormalize,
6        VecZnxNormalizeInplace, VecZnxNormalizeTmpBytes, VecZnxSub, VecZnxSubABInplace, VecZnxSwithcDegree, ZnxView, ZnxViewMut,
7    },
8    layouts::{Backend, DataMut, DataRef, Module, Scratch},
9    source::Source,
10};
11
12use crate::{
13    TakeGLWESecret, TakeGLWESecretPrepared,
14    layouts::{GGLWESwitchingKey, GLWESecret, Infos, LWESecret, LWESwitchingKey, prepared::GLWESecretPrepared},
15};
16
17impl LWESwitchingKey<Vec<u8>> {
18    pub fn encrypt_sk_scratch_space<B: Backend>(module: &Module<B>, n: usize, basek: usize, k: usize) -> usize
19    where
20        Module<B>: SvpPPolAllocBytes + VecZnxNormalizeTmpBytes + VecZnxDftAllocBytes + VecZnxNormalizeTmpBytes,
21    {
22        GLWESecret::bytes_of(n, 1)
23            + GLWESecretPrepared::bytes_of(module, n, 1)
24            + GGLWESwitchingKey::encrypt_sk_scratch_space(module, n, basek, k, 1, 1)
25    }
26}
27
28impl<D: DataMut> LWESwitchingKey<D> {
29    #[allow(clippy::too_many_arguments)]
30    pub fn encrypt_sk<DIn, DOut, B: Backend>(
31        &mut self,
32        module: &Module<B>,
33        sk_lwe_in: &LWESecret<DIn>,
34        sk_lwe_out: &LWESecret<DOut>,
35        source_xa: &mut Source,
36        source_xe: &mut Source,
37        sigma: f64,
38        scratch: &mut Scratch<B>,
39    ) where
40        DIn: DataRef,
41        DOut: DataRef,
42        Module<B>: VecZnxAutomorphismInplace
43            + VecZnxAddScalarInplace
44            + VecZnxDftAllocBytes
45            + VecZnxBigNormalize<B>
46            + VecZnxDftFromVecZnx<B>
47            + SvpApplyInplace<B>
48            + VecZnxDftToVecZnxBigConsume<B>
49            + VecZnxNormalizeTmpBytes
50            + VecZnxFillUniform
51            + VecZnxSubABInplace
52            + VecZnxAddInplace
53            + VecZnxNormalizeInplace<B>
54            + VecZnxAddNormal
55            + VecZnxNormalize<B>
56            + VecZnxSub
57            + SvpPrepare<B>
58            + VecZnxSwithcDegree
59            + SvpPPolAllocBytes,
60        Scratch<B>: TakeVecZnxDft<B> + ScratchAvailable + TakeVecZnx + TakeScalarZnx + TakeGLWESecretPrepared<B>,
61    {
62        #[cfg(debug_assertions)]
63        {
64            assert!(sk_lwe_in.n() <= self.n());
65            assert!(sk_lwe_out.n() <= self.n());
66            assert!(self.n() <= module.n());
67        }
68
69        let (mut sk_in_glwe, scratch1) = scratch.take_glwe_secret(self.n(), 1);
70        let (mut sk_out_glwe, scratch2) = scratch1.take_glwe_secret(self.n(), 1);
71
72        sk_out_glwe.data.at_mut(0, 0)[..sk_lwe_out.n()].copy_from_slice(sk_lwe_out.data.at(0, 0));
73        sk_out_glwe.data.at_mut(0, 0)[sk_lwe_out.n()..].fill(0);
74        module.vec_znx_automorphism_inplace(-1, &mut sk_out_glwe.data.as_vec_znx_mut(), 0);
75
76        sk_in_glwe.data.at_mut(0, 0)[..sk_lwe_in.n()].copy_from_slice(sk_lwe_in.data.at(0, 0));
77        sk_in_glwe.data.at_mut(0, 0)[sk_lwe_in.n()..].fill(0);
78        module.vec_znx_automorphism_inplace(-1, &mut sk_in_glwe.data.as_vec_znx_mut(), 0);
79
80        self.0.encrypt_sk(
81            module,
82            &sk_in_glwe,
83            &sk_out_glwe,
84            source_xa,
85            source_xe,
86            sigma,
87            scratch2,
88        );
89    }
90}
poulpy_core/encryption/lwe_ksk.rs

poulpy_core/encryption/
lwe_ksk.rs
