poulpy_core/encryption/compressed/
glwe_switching_key.rs

1use poulpy_hal::{
2    api::{ModuleN, ScratchAvailable, ScratchTakeBasic, SvpPrepare, VecZnxSwitchRing},
3    layouts::{Backend, DataMut, Module, ScalarZnx, Scratch},
4    source::Source,
5};
6
7use crate::{
8    GGLWECompressedEncryptSk, ScratchTakeCore,
9    layouts::{
10        GGLWECompressedSeedMut, GGLWECompressedToMut, GGLWEInfos, GLWEInfos, GLWESecret, GLWESecretToRef,
11        GLWESwitchingKeyDegreesMut, LWEInfos,
12        compressed::GLWESwitchingKeyCompressed,
13        prepared::{GLWESecretPrepared, GLWESecretPreparedFactory},
14    },
15};
16
17impl GLWESwitchingKeyCompressed<Vec<u8>> {
18    pub fn encrypt_sk_tmp_bytes<M, A, BE: Backend>(module: &M, infos: &A) -> usize
19    where
20        A: GGLWEInfos,
21        M: GLWESwitchingKeyCompressedEncryptSk<BE>,
22    {
23        module.glwe_switching_key_compressed_encrypt_sk_tmp_bytes(infos)
24    }
25}
26
27impl<D: DataMut> GLWESwitchingKeyCompressed<D> {
28    #[allow(clippy::too_many_arguments)]
29    pub fn encrypt_sk<M, S1, S2, BE: Backend>(
30        &mut self,
31        module: &M,
32        sk_in: &S1,
33        sk_out: &S2,
34        seed_xa: [u8; 32],
35        source_xe: &mut Source,
36        scratch: &mut Scratch<BE>,
37    ) where
38        S1: GLWESecretToRef,
39        S2: GLWESecretToRef,
40        M: GLWESwitchingKeyCompressedEncryptSk<BE>,
41    {
42        module.glwe_switching_key_compressed_encrypt_sk(self, sk_in, sk_out, seed_xa, source_xe, scratch);
43    }
44}
45
46pub trait GLWESwitchingKeyCompressedEncryptSk<BE: Backend> {
47    fn glwe_switching_key_compressed_encrypt_sk_tmp_bytes<A>(&self, infos: &A) -> usize
48    where
49        A: GGLWEInfos;
50
51    fn glwe_switching_key_compressed_encrypt_sk<R, S1, S2>(
52        &self,
53        res: &mut R,
54        sk_in: &S1,
55        sk_out: &S2,
56        seed_xa: [u8; 32],
57        source_xe: &mut Source,
58        scratch: &mut Scratch<BE>,
59    ) where
60        R: GGLWECompressedToMut + GGLWECompressedSeedMut + GLWESwitchingKeyDegreesMut + GGLWEInfos,
61        S1: GLWESecretToRef,
62        S2: GLWESecretToRef;
63}
64
65impl<BE: Backend> GLWESwitchingKeyCompressedEncryptSk<BE> for Module<BE>
66where
67    Self: ModuleN + GGLWECompressedEncryptSk<BE> + GLWESecretPreparedFactory<BE> + VecZnxSwitchRing,
68    Scratch<BE>: ScratchTakeCore<BE>,
69{
70    fn glwe_switching_key_compressed_encrypt_sk_tmp_bytes<A>(&self, infos: &A) -> usize
71    where
72        A: GGLWEInfos,
73    {
74        self.gglwe_compressed_encrypt_sk_tmp_bytes(infos)
75            .max(ScalarZnx::bytes_of(self.n(), 1))
76            + ScalarZnx::bytes_of(self.n(), infos.rank_in().into())
77            + GLWESecretPrepared::bytes_of(self, infos.rank_out())
78    }
79
80    fn glwe_switching_key_compressed_encrypt_sk<R, S1, S2>(
81        &self,
82        res: &mut R,
83        sk_in: &S1,
84        sk_out: &S2,
85        seed_xa: [u8; 32],
86        source_xe: &mut Source,
87        scratch: &mut Scratch<BE>,
88    ) where
89        R: GGLWECompressedToMut + GGLWECompressedSeedMut + GLWESwitchingKeyDegreesMut + GGLWEInfos,
90        S1: GLWESecretToRef,
91        S2: GLWESecretToRef,
92    {
93        let sk_in: &GLWESecret<&[u8]> = &sk_in.to_ref();
94        let sk_out: &GLWESecret<&[u8]> = &sk_out.to_ref();
95
96        assert!(sk_in.n().0 <= self.n() as u32);
97        assert!(sk_out.n().0 <= self.n() as u32);
98        assert!(
99            scratch.available() >= self.gglwe_compressed_encrypt_sk_tmp_bytes(res),
100            "scratch.available()={} < GLWESwitchingKey::encrypt_sk_tmp_bytes={}",
101            scratch.available(),
102            self.gglwe_compressed_encrypt_sk_tmp_bytes(res)
103        );
104
105        let (mut sk_in_tmp, scratch_1) = scratch.take_scalar_znx(self.n(), sk_in.rank().into());
106        for i in 0..sk_in.rank().into() {
107            self.vec_znx_switch_ring(
108                &mut sk_in_tmp.as_vec_znx_mut(),
109                i,
110                &sk_in.data.as_vec_znx(),
111                i,
112            );
113        }
114
115        let (mut sk_out_tmp, scratch_2) = scratch_1.take_glwe_secret_prepared(self, sk_out.rank());
116        {
117            let (mut tmp, _) = scratch_2.take_scalar_znx(self.n(), 1);
118            for i in 0..sk_out.rank().into() {
119                self.vec_znx_switch_ring(&mut tmp.as_vec_znx_mut(), 0, &sk_out.data.as_vec_znx(), i);
120                self.svp_prepare(&mut sk_out_tmp.data, i, &tmp, 0);
121            }
122        }
123
124        sk_out_tmp.dist = sk_out.dist;
125
126        self.gglwe_compressed_encrypt_sk(res, &sk_in_tmp, &sk_out_tmp, seed_xa, source_xe, scratch_2);
127
128        *res.input_degree() = sk_in.n();
129        *res.output_degree() = sk_out.n();
130    }
131}
poulpy_core/encryption/compressed/glwe_switching_key.rs

poulpy_core/encryption/compressed/
glwe_switching_key.rs
