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