poulpy_core/encryption/compressed/
gglwe_ksk.rs

1use poulpy_hal::{
2    api::{
3        ScratchAvailable, SvpApplyDftToDftInplace, SvpPPolAllocBytes, SvpPrepare, TakeScalarZnx, TakeVecZnx, TakeVecZnxDft,
4        VecZnxAddInplace, VecZnxAddNormal, VecZnxAddScalarInplace, VecZnxBigNormalize, VecZnxDftAllocBytes, VecZnxDftApply,
5        VecZnxFillUniform, VecZnxIdftApplyConsume, VecZnxNormalize, VecZnxNormalizeInplace, VecZnxNormalizeTmpBytes, VecZnxSub,
6        VecZnxSubInplace, VecZnxSwitchRing,
7    },
8    layouts::{Backend, DataMut, DataRef, Module, ScalarZnx, Scratch},
9    source::Source,
10};
11
12use crate::{
13    TakeGLWESecretPrepared,
14    layouts::{
15        Degree, GGLWECiphertext, GGLWELayoutInfos, GLWEInfos, GLWESecret, LWEInfos, compressed::GGLWESwitchingKeyCompressed,
16        prepared::GLWESecretPrepared,
17    },
18};
19
20impl GGLWESwitchingKeyCompressed<Vec<u8>> {
21    pub fn encrypt_sk_scratch_space<B: Backend, A>(module: &Module<B>, infos: &A) -> usize
22    where
23        A: GGLWELayoutInfos,
24        Module<B>: VecZnxNormalizeTmpBytes + VecZnxDftAllocBytes + VecZnxNormalizeTmpBytes + SvpPPolAllocBytes,
25    {
26        (GGLWECiphertext::encrypt_sk_scratch_space(module, infos) | ScalarZnx::alloc_bytes(module.n(), 1))
27            + ScalarZnx::alloc_bytes(module.n(), infos.rank_in().into())
28            + GLWESecretPrepared::alloc_bytes_with(module, infos.rank_out())
29    }
30}
31
32impl<DataSelf: DataMut> GGLWESwitchingKeyCompressed<DataSelf> {
33    #[allow(clippy::too_many_arguments)]
34    pub fn encrypt_sk<DataSkIn: DataRef, DataSkOut: DataRef, B: Backend>(
35        &mut self,
36        module: &Module<B>,
37        sk_in: &GLWESecret<DataSkIn>,
38        sk_out: &GLWESecret<DataSkOut>,
39        seed_xa: [u8; 32],
40        source_xe: &mut Source,
41        scratch: &mut Scratch<B>,
42    ) where
43        Module<B>: SvpPrepare<B>
44            + SvpPPolAllocBytes
45            + VecZnxSwitchRing
46            + VecZnxDftAllocBytes
47            + VecZnxBigNormalize<B>
48            + VecZnxDftApply<B>
49            + SvpApplyDftToDftInplace<B>
50            + VecZnxIdftApplyConsume<B>
51            + VecZnxNormalizeTmpBytes
52            + VecZnxFillUniform
53            + VecZnxSubInplace
54            + VecZnxAddInplace
55            + VecZnxNormalizeInplace<B>
56            + VecZnxAddNormal
57            + VecZnxNormalize<B>
58            + VecZnxSub
59            + VecZnxAddScalarInplace,
60        Scratch<B>: TakeVecZnxDft<B> + ScratchAvailable + TakeVecZnx + TakeScalarZnx + TakeGLWESecretPrepared<B>,
61    {
62        #[cfg(debug_assertions)]
63        {
64            use crate::layouts::GGLWESwitchingKey;
65
66            assert!(sk_in.n().0 <= module.n() as u32);
67            assert!(sk_out.n().0 <= module.n() as u32);
68            assert!(
69                scratch.available() >= GGLWESwitchingKey::encrypt_sk_scratch_space(module, self),
70                "scratch.available()={} < GLWESwitchingKey::encrypt_sk_scratch_space={}",
71                scratch.available(),
72                GGLWESwitchingKey::encrypt_sk_scratch_space(module, self)
73            )
74        }
75
76        let n: usize = sk_in.n().max(sk_out.n()).into();
77
78        let (mut sk_in_tmp, scratch_1) = scratch.take_scalar_znx(n, sk_in.rank().into());
79        (0..sk_in.rank().into()).for_each(|i| {
80            module.vec_znx_switch_ring(
81                &mut sk_in_tmp.as_vec_znx_mut(),
82                i,
83                &sk_in.data.as_vec_znx(),
84                i,
85            );
86        });
87
88        let (mut sk_out_tmp, scratch_2) = scratch_1.take_glwe_secret_prepared(Degree(n as u32), sk_out.rank());
89        {
90            let (mut tmp, _) = scratch_2.take_scalar_znx(n, 1);
91            (0..sk_out.rank().into()).for_each(|i| {
92                module.vec_znx_switch_ring(&mut tmp.as_vec_znx_mut(), 0, &sk_out.data.as_vec_znx(), i);
93                module.svp_prepare(&mut sk_out_tmp.data, i, &tmp, 0);
94            });
95        }
96
97        self.key.encrypt_sk(
98            module,
99            &sk_in_tmp,
100            &sk_out_tmp,
101            seed_xa,
102            source_xe,
103            scratch_2,
104        );
105        self.sk_in_n = sk_in.n().into();
106        self.sk_out_n = sk_out.n().into();
107    }
108}
poulpy_core/encryption/compressed/gglwe_ksk.rs

poulpy_core/encryption/compressed/
gglwe_ksk.rs
