poulpy_core/encryption/
lwe_to_glwe_key.rs

1use poulpy_hal::{
2    api::{ModuleN, VecZnxAutomorphismInplace, VecZnxAutomorphismInplaceTmpBytes},
3    layouts::{Backend, DataMut, Module, Scratch, ZnxView, ZnxViewMut},
4    source::Source,
5};
6
7use crate::{
8    GGLWEEncryptSk, ScratchTakeCore,
9    layouts::{
10        GGLWE, GGLWEInfos, GGLWEToMut, GLWESecret, GLWESecretPreparedFactory, GLWESecretPreparedToRef, LWEInfos, LWESecret,
11        LWESecretToRef, LWEToGLWEKey, Rank,
12    },
13};
14
15impl LWEToGLWEKey<Vec<u8>> {
16    pub fn encrypt_sk_tmp_bytes<M, A, BE: Backend>(module: &M, infos: &A) -> usize
17    where
18        A: GGLWEInfos,
19        M: LWEToGLWESwitchingKeyEncryptSk<BE>,
20    {
21        module.lwe_to_glwe_key_encrypt_sk_tmp_bytes(infos)
22    }
23}
24
25impl<D: DataMut> LWEToGLWEKey<D> {
26    pub fn encrypt_sk<S1, S2, M, BE: Backend>(
27        &mut self,
28        module: &M,
29        sk_lwe: &S1,
30        sk_glwe: &S2,
31        source_xa: &mut Source,
32        source_xe: &mut Source,
33        scratch: &mut Scratch<BE>,
34    ) where
35        S1: LWESecretToRef,
36        S2: GLWESecretPreparedToRef<BE>,
37        M: LWEToGLWESwitchingKeyEncryptSk<BE>,
38        Scratch<BE>: ScratchTakeCore<BE>,
39    {
40        module.lwe_to_glwe_key_encrypt_sk(self, sk_lwe, sk_glwe, source_xa, source_xe, scratch);
41    }
42}
43
44pub trait LWEToGLWESwitchingKeyEncryptSk<BE: Backend> {
45    fn lwe_to_glwe_key_encrypt_sk_tmp_bytes<A>(&self, infos: &A) -> usize
46    where
47        A: GGLWEInfos;
48
49    fn lwe_to_glwe_key_encrypt_sk<R, S1, S2>(
50        &self,
51        res: &mut R,
52        sk_lwe: &S1,
53        sk_glwe: &S2,
54        source_xa: &mut Source,
55        source_xe: &mut Source,
56        scratch: &mut Scratch<BE>,
57    ) where
58        S1: LWESecretToRef,
59        S2: GLWESecretPreparedToRef<BE>,
60        R: GGLWEToMut;
61}
62
63impl<BE: Backend> LWEToGLWESwitchingKeyEncryptSk<BE> for Module<BE>
64where
65    Self: ModuleN
66        + GGLWEEncryptSk<BE>
67        + VecZnxAutomorphismInplace<BE>
68        + GLWESecretPreparedFactory<BE>
69        + VecZnxAutomorphismInplaceTmpBytes,
70    Scratch<BE>: ScratchTakeCore<BE>,
71{
72    fn lwe_to_glwe_key_encrypt_sk_tmp_bytes<A>(&self, infos: &A) -> usize
73    where
74        A: GGLWEInfos,
75    {
76        debug_assert_eq!(
77            infos.rank_in(),
78            Rank(1),
79            "rank_in != 1 is not supported for LWEToGLWEKeyPrepared"
80        );
81        GLWESecret::bytes_of(self.n().into(), infos.rank_in())
82            + GGLWE::encrypt_sk_tmp_bytes(self, infos).max(self.vec_znx_automorphism_inplace_tmp_bytes())
83    }
84
85    fn lwe_to_glwe_key_encrypt_sk<R, S1, S2>(
86        &self,
87        res: &mut R,
88        sk_lwe: &S1,
89        sk_glwe: &S2,
90        source_xa: &mut Source,
91        source_xe: &mut Source,
92        scratch: &mut Scratch<BE>,
93    ) where
94        S1: LWESecretToRef,
95        S2: GLWESecretPreparedToRef<BE>,
96        R: GGLWEToMut,
97    {
98        let sk_lwe: &LWESecret<&[u8]> = &sk_lwe.to_ref();
99
100        assert!(sk_lwe.n().0 <= self.n() as u32);
101
102        let (mut sk_lwe_as_glwe, scratch_1) = scratch.take_glwe_secret(self.n().into(), Rank(1));
103        sk_lwe_as_glwe.dist = sk_lwe.dist;
104
105        sk_lwe_as_glwe.data.at_mut(0, 0)[..sk_lwe.n().into()].copy_from_slice(sk_lwe.data.at(0, 0));
106        sk_lwe_as_glwe.data.at_mut(0, 0)[sk_lwe.n().into()..].fill(0);
107        self.vec_znx_automorphism_inplace(-1, &mut sk_lwe_as_glwe.data.as_vec_znx_mut(), 0, scratch_1);
108
109        self.gglwe_encrypt_sk(
110            res,
111            &sk_lwe_as_glwe.data,
112            sk_glwe,
113            source_xa,
114            source_xe,
115            scratch_1,
116        );
117    }
118}
poulpy_core/encryption/lwe_to_glwe_key.rs

poulpy_core/encryption/
lwe_to_glwe_key.rs
