1use poulpy_hal::{
  2    api::{
  3        ScratchAvailable, SvpApplyDftToDftInplace, TakeVecZnx, TakeVecZnxDft, VecZnxAddInplace, VecZnxAddNormal,
  4        VecZnxAddScalarInplace, VecZnxBigNormalize, VecZnxDftAllocBytes, VecZnxDftApply, VecZnxFillUniform,
  5        VecZnxIdftApplyConsume, VecZnxNormalize, VecZnxNormalizeInplace, VecZnxNormalizeTmpBytes, VecZnxSub, VecZnxSubABInplace,
  6    },
  7    layouts::{Backend, DataMut, DataRef, Module, ScalarZnx, Scratch, ZnxZero},
  8    source::Source,
  9};
 10
 11use crate::{
 12    TakeGLWEPt,
 13    encryption::{SIGMA, glwe_encrypt_sk_internal},
 14    layouts::{GGLWECiphertext, Infos, compressed::GGLWECiphertextCompressed, prepared::GLWESecretPrepared},
 15};
 16
 17impl GGLWECiphertextCompressed<Vec<u8>> {
 18    pub fn encrypt_sk_scratch_space<B: Backend>(module: &Module<B>, basek: usize, k: usize) -> usize
 19    where
 20        Module<B>: VecZnxNormalizeTmpBytes + VecZnxDftAllocBytes + VecZnxNormalizeTmpBytes,
 21    {
 22        GGLWECiphertext::encrypt_sk_scratch_space(module, basek, k)
 23    }
 24}
 25
 26impl<D: DataMut> GGLWECiphertextCompressed<D> {
 27    #[allow(clippy::too_many_arguments)]
 28    pub fn encrypt_sk<DataPt: DataRef, DataSk: DataRef, B: Backend>(
 29        &mut self,
 30        module: &Module<B>,
 31        pt: &ScalarZnx<DataPt>,
 32        sk: &GLWESecretPrepared<DataSk, B>,
 33        seed: [u8; 32],
 34        source_xe: &mut Source,
 35        scratch: &mut Scratch<B>,
 36    ) where
 37        Module<B>: VecZnxAddScalarInplace
 38            + VecZnxDftAllocBytes
 39            + VecZnxBigNormalize<B>
 40            + VecZnxDftApply<B>
 41            + SvpApplyDftToDftInplace<B>
 42            + VecZnxIdftApplyConsume<B>
 43            + VecZnxNormalizeTmpBytes
 44            + VecZnxFillUniform
 45            + VecZnxSubABInplace
 46            + VecZnxAddInplace
 47            + VecZnxNormalizeInplace<B>
 48            + VecZnxAddNormal
 49            + VecZnxNormalize<B>
 50            + VecZnxSub,
 51        Scratch<B>: TakeVecZnxDft<B> + ScratchAvailable + TakeVecZnx,
 52    {
 53        #[cfg(debug_assertions)]
 54        {
 55            use poulpy_hal::layouts::ZnxInfos;
 56
 57            assert_eq!(
 58                self.rank_in(),
 59                pt.cols(),
 60                "self.rank_in(): {} != pt.cols(): {}",
 61                self.rank_in(),
 62                pt.cols()
 63            );
 64            assert_eq!(
 65                self.rank_out(),
 66                sk.rank(),
 67                "self.rank_out(): {} != sk.rank(): {}",
 68                self.rank_out(),
 69                sk.rank()
 70            );
 71            assert_eq!(self.n(), sk.n());
 72            assert_eq!(pt.n(), sk.n());
 73            assert!(
 74                scratch.available() >= GGLWECiphertextCompressed::encrypt_sk_scratch_space(module, self.basek(), self.k()),
 75                "scratch.available: {} < GGLWECiphertext::encrypt_sk_scratch_space(module, self.rank()={}, self.size()={}): {}",
 76                scratch.available(),
 77                self.rank(),
 78                self.size(),
 79                GGLWECiphertextCompressed::encrypt_sk_scratch_space(module, self.basek(), self.k())
 80            );
 81            assert!(
 82                self.rows() * self.digits() * self.basek() <= self.k(),
 83                "self.rows() : {} * self.digits() : {} * self.basek() : {} = {} >= self.k() = {}",
 84                self.rows(),
 85                self.digits(),
 86                self.basek(),
 87                self.rows() * self.digits() * self.basek(),
 88                self.k()
 89            );
 90        }
 91
 92        let rows: usize = self.rows();
 93        let digits: usize = self.digits();
 94        let basek: usize = self.basek();
 95        let k: usize = self.k();
 96        let rank_in: usize = self.rank_in();
 97        let cols: usize = self.rank_out() + 1;
 98
 99        let mut source_xa = Source::new(seed);
100
101        let (mut tmp_pt, scrach_1) = scratch.take_glwe_pt(sk.n(), basek, k);
102        (0..rank_in).for_each(|col_i| {
103            (0..rows).for_each(|row_i| {
104                // Adds the scalar_znx_pt to the i-th limb of the vec_znx_pt
105                tmp_pt.data.zero(); // zeroes for next iteration
106                module.vec_znx_add_scalar_inplace(
107                    &mut tmp_pt.data,
108                    0,
109                    (digits - 1) + row_i * digits,
110                    pt,
111                    col_i,
112                );
113                module.vec_znx_normalize_inplace(basek, &mut tmp_pt.data, 0, scrach_1);
114
115                let (seed, mut source_xa_tmp) = source_xa.branch();
116                self.seed[col_i * rows + row_i] = seed;
117
118                glwe_encrypt_sk_internal(
119                    module,
120                    self.basek(),
121                    self.k(),
122                    &mut self.at_mut(row_i, col_i).data,
123                    cols,
124                    true,
125                    Some((&tmp_pt, 0)),
126                    sk,
127                    &mut source_xa_tmp,
128                    source_xe,
129                    SIGMA,
130                    scrach_1,
131                );
132            });
133        });
134    }
135}