1use poulpy_hal::{
 2    api::{
 3        ScratchAvailable, SvpApplyDftToDftInplace, SvpPPolAllocBytes, SvpPrepare, TakeScalarZnx, TakeVecZnx, TakeVecZnxDft,
 4        VecZnxAddInplace, VecZnxAddNormal, VecZnxAddScalarInplace, VecZnxAutomorphismInplace, VecZnxBigNormalize,
 5        VecZnxDftAllocBytes, VecZnxDftApply, VecZnxFillUniform, VecZnxIdftApplyConsume, VecZnxNormalize, VecZnxNormalizeInplace,
 6        VecZnxNormalizeTmpBytes, VecZnxSub, VecZnxSubInplace, VecZnxSwitchRing,
 7    },
 8    layouts::{Backend, DataMut, DataRef, Module, Scratch, ZnxView, ZnxViewMut, ZnxZero},
 9    source::Source,
10};
11
12use crate::{
13    TakeGLWESecret, TakeGLWESecretPrepared,
14    layouts::{GGLWEInfos, GGLWESwitchingKey, GLWESecret, GLWEToLWEKey, LWEInfos, LWESecret, Rank, prepared::GLWESecretPrepared},
15};
16
17impl GLWEToLWEKey<Vec<u8>> {
18    pub fn encrypt_sk_scratch_space<B: Backend, A>(module: &Module<B>, infos: &A) -> usize
19    where
20        A: GGLWEInfos,
21        Module<B>: SvpPPolAllocBytes + VecZnxNormalizeTmpBytes + VecZnxDftAllocBytes + VecZnxNormalizeTmpBytes,
22    {
23        GLWESecretPrepared::alloc_bytes_with(module, infos.rank_in())
24            + (GGLWESwitchingKey::encrypt_sk_scratch_space(module, infos)
25                | GLWESecret::alloc_bytes_with(infos.n(), infos.rank_in()))
26    }
27}
28
29impl<D: DataMut> GLWEToLWEKey<D> {
30    #[allow(clippy::too_many_arguments)]
31    pub fn encrypt_sk<DLwe, DGlwe, B: Backend>(
32        &mut self,
33        module: &Module<B>,
34        sk_lwe: &LWESecret<DLwe>,
35        sk_glwe: &GLWESecret<DGlwe>,
36        source_xa: &mut Source,
37        source_xe: &mut Source,
38        scratch: &mut Scratch<B>,
39    ) where
40        DLwe: DataRef,
41        DGlwe: DataRef,
42        Module<B>: VecZnxAutomorphismInplace<B>
43            + VecZnxAddScalarInplace
44            + VecZnxDftAllocBytes
45            + VecZnxBigNormalize<B>
46            + VecZnxDftApply<B>
47            + SvpApplyDftToDftInplace<B>
48            + VecZnxIdftApplyConsume<B>
49            + VecZnxNormalizeTmpBytes
50            + VecZnxFillUniform
51            + VecZnxSubInplace
52            + VecZnxAddInplace
53            + VecZnxNormalizeInplace<B>
54            + VecZnxAddNormal
55            + VecZnxNormalize<B>
56            + VecZnxSub
57            + SvpPrepare<B>
58            + VecZnxSwitchRing
59            + SvpPPolAllocBytes,
60        Scratch<B>: TakeVecZnxDft<B> + ScratchAvailable + TakeVecZnx + TakeScalarZnx + TakeGLWESecretPrepared<B>,
61    {
62        #[cfg(debug_assertions)]
63        {
64            assert!(sk_lwe.n().0 <= module.n() as u32);
65        }
66
67        let (mut sk_lwe_as_glwe, scratch_1) = scratch.take_glwe_secret(sk_glwe.n(), Rank(1));
68        sk_lwe_as_glwe.data.zero();
69        sk_lwe_as_glwe.data.at_mut(0, 0)[..sk_lwe.n().into()].copy_from_slice(sk_lwe.data.at(0, 0));
70        module.vec_znx_automorphism_inplace(-1, &mut sk_lwe_as_glwe.data.as_vec_znx_mut(), 0, scratch_1);
71
72        self.0.encrypt_sk(
73            module,
74            sk_glwe,
75            &sk_lwe_as_glwe,
76            source_xa,
77            source_xe,
78            scratch_1,
79        );
80    }
81}