1use poulpy_hal::{
  2    api::{
  3        ModuleN, ScratchTakeBasic, SvpApplyDftToDft, SvpPPolBytesOf, SvpPrepare, VecZnxBigBytesOf, VecZnxBigNormalize,
  4        VecZnxDftApply, VecZnxDftBytesOf, VecZnxIdftApplyTmpA,
  5    },
  6    layouts::{Backend, DataMut, Module, Scratch},
  7    oep::{SvpPPolAllocBytesImpl, VecZnxBigAllocBytesImpl, VecZnxDftAllocBytesImpl},
  8    source::Source,
  9};
 10
 11use crate::{
 12    ScratchTakeCore,
 13    encryption::compressed::gglwe_ksk::GLWESwitchingKeyCompressedEncryptSk,
 14    encryption::gglwe_tsk::TensorKeyEncryptSk,
 15    layouts::{
 16        GGLWEInfos, GLWEInfos, GLWESecret, GLWESecretToRef, GetDist, LWEInfos, Rank,
 17        compressed::{TensorKeyCompressed, TensorKeyCompressedToMut},
 18    },
 19};
 20
 21impl TensorKeyCompressed<Vec<u8>> {
 22    pub fn encrypt_sk_tmp_bytes<M, A, BE: Backend>(module: &M, infos: &A) -> usize
 23    where
 24        A: GGLWEInfos,
 25        M: GGLWETensorKeyCompressedEncryptSk<BE>,
 26    {
 27        module.gglwe_tensor_key_compressed_encrypt_sk_tmp_bytes(infos)
 28    }
 29}
 30
 31impl<DataSelf: DataMut> TensorKeyCompressed<DataSelf> {
 32    pub fn encrypt_sk<S, M, BE: Backend>(
 33        &mut self,
 34        module: &M,
 35        sk: &S,
 36        seed_xa: [u8; 32],
 37        source_xe: &mut Source,
 38        scratch: &mut Scratch<BE>,
 39    ) where
 40        S: GLWESecretToRef + GetDist,
 41        M: GGLWETensorKeyCompressedEncryptSk<BE>,
 42    {
 43        module.gglwe_tensor_key_encrypt_sk(self, sk, seed_xa, source_xe, scratch);
 44    }
 45}
 46
 47pub trait GGLWETensorKeyCompressedEncryptSk<BE: Backend> {
 48    fn gglwe_tensor_key_compressed_encrypt_sk_tmp_bytes<A>(&self, infos: &A) -> usize
 49    where
 50        A: GGLWEInfos;
 51
 52    fn gglwe_tensor_key_encrypt_sk<R, S>(
 53        &self,
 54        res: &mut R,
 55        sk: &S,
 56        seed_xa: [u8; 32],
 57        source_xe: &mut Source,
 58        scratch: &mut Scratch<BE>,
 59    ) where
 60        R: TensorKeyCompressedToMut,
 61        S: GLWESecretToRef + GetDist;
 62}
 63
 64impl<BE: Backend> GGLWETensorKeyCompressedEncryptSk<BE> for Module<BE>
 65where
 66    Self: ModuleN
 67        + GLWESwitchingKeyCompressedEncryptSk<BE>
 68        + TensorKeyEncryptSk<BE>
 69        + VecZnxDftApply<BE>
 70        + SvpApplyDftToDft<BE>
 71        + VecZnxIdftApplyTmpA<BE>
 72        + VecZnxBigNormalize<BE>
 73        + SvpPrepare<BE>
 74        + SvpPPolAllocBytesImpl<BE>
 75        + SvpPPolBytesOf
 76        + VecZnxDftAllocBytesImpl<BE>
 77        + VecZnxBigAllocBytesImpl<BE>
 78        + VecZnxDftBytesOf
 79        + VecZnxBigBytesOf,
 80    Scratch<BE>: ScratchTakeBasic + ScratchTakeCore<BE>,
 81{
 82    fn gglwe_tensor_key_compressed_encrypt_sk_tmp_bytes<A>(&self, infos: &A) -> usize
 83    where
 84        A: GGLWEInfos,
 85    {
 86        self.tensor_key_encrypt_sk_tmp_bytes(infos)
 87    }
 88
 89    fn gglwe_tensor_key_encrypt_sk<R, S>(
 90        &self,
 91        res: &mut R,
 92        sk: &S,
 93        seed_xa: [u8; 32],
 94        source_xe: &mut Source,
 95        scratch: &mut Scratch<BE>,
 96    ) where
 97        R: TensorKeyCompressedToMut,
 98        S: GLWESecretToRef + GetDist,
 99    {
100        let res: &mut TensorKeyCompressed<&mut [u8]> = &mut res.to_mut();
101
102        let (mut sk_dft_prep, scratch_1) = scratch.take_glwe_secret_prepared(self, res.rank_out());
103        sk_dft_prep.prepare(self, sk);
104
105        let sk: &GLWESecret<&[u8]> = &sk.to_ref();
106
107        #[cfg(debug_assertions)]
108        {
109            assert_eq!(res.rank_out(), sk.rank());
110            assert_eq!(res.n(), sk.n());
111        }
112
113        // let n: usize = sk.n().into();
114        let rank: usize = res.rank_out().into();
115
116        let (mut sk_dft, scratch_2) = scratch_1.take_vec_znx_dft(self, rank, 1);
117
118        for i in 0..rank {
119            self.vec_znx_dft_apply(1, 0, &mut sk_dft, i, &sk.data.as_vec_znx(), i);
120        }
121
122        let (mut sk_ij_big, scratch_3) = scratch_2.take_vec_znx_big(self, 1, 1);
123        let (mut sk_ij, scratch_4) = scratch_3.take_glwe_secret(self, Rank(1));
124        let (mut sk_ij_dft, scratch_5) = scratch_4.take_vec_znx_dft(self, 1, 1);
125
126        let mut source_xa: Source = Source::new(seed_xa);
127
128        for i in 0..rank {
129            for j in i..rank {
130                self.svp_apply_dft_to_dft(&mut sk_ij_dft, 0, &sk_dft_prep.data, j, &sk_dft, i);
131
132                self.vec_znx_idft_apply_tmpa(&mut sk_ij_big, 0, &mut sk_ij_dft, 0);
133                self.vec_znx_big_normalize(
134                    res.base2k().into(),
135                    &mut sk_ij.data.as_vec_znx_mut(),
136                    0,
137                    res.base2k().into(),
138                    &sk_ij_big,
139                    0,
140                    scratch_5,
141                );
142
143                let (seed_xa_tmp, _) = source_xa.branch();
144
145                self.glwe_switching_key_compressed_encrypt_sk(
146                    res.at_mut(i, j),
147                    &sk_ij,
148                    sk,
149                    seed_xa_tmp,
150                    source_xe,
151                    scratch_5,
152                );
153            }
154        }
155    }
156}