1use poulpy_backend::hal::{
  2    api::{VmpPMatAlloc, VmpPMatAllocBytes, VmpPrepare},
  3    layouts::{Backend, Data, DataMut, DataRef, Module, Scratch, VmpPMat},
  4};
  5
  6use crate::layouts::{
  7    GGLWESwitchingKey, Infos,
  8    prepared::{GGLWECiphertextPrepared, Prepare, PrepareAlloc},
  9};
 10
 11#[derive(PartialEq, Eq)]
 12pub struct GGLWESwitchingKeyPrepared<D: Data, B: Backend> {
 13    pub(crate) key: GGLWECiphertextPrepared<D, B>,
 14    pub(crate) sk_in_n: usize,  // Degree of sk_in
 15    pub(crate) sk_out_n: usize, // Degree of sk_out
 16}
 17
 18impl<B: Backend> GGLWESwitchingKeyPrepared<Vec<u8>, B> {
 19    #[allow(clippy::too_many_arguments)]
 20    pub fn alloc(
 21        module: &Module<B>,
 22        n: usize,
 23        basek: usize,
 24        k: usize,
 25        rows: usize,
 26        digits: usize,
 27        rank_in: usize,
 28        rank_out: usize,
 29    ) -> Self
 30    where
 31        Module<B>: VmpPMatAlloc<B>,
 32    {
 33        GGLWESwitchingKeyPrepared::<Vec<u8>, B> {
 34            key: GGLWECiphertextPrepared::alloc(module, n, basek, k, rows, digits, rank_in, rank_out),
 35            sk_in_n: 0,
 36            sk_out_n: 0,
 37        }
 38    }
 39
 40    #[allow(clippy::too_many_arguments)]
 41    pub fn bytes_of(
 42        module: &Module<B>,
 43        n: usize,
 44        basek: usize,
 45        k: usize,
 46        rows: usize,
 47        digits: usize,
 48        rank_in: usize,
 49        rank_out: usize,
 50    ) -> usize
 51    where
 52        Module<B>: VmpPMatAllocBytes,
 53    {
 54        GGLWECiphertextPrepared::bytes_of(module, n, basek, k, rows, digits, rank_in, rank_out)
 55    }
 56}
 57
 58impl<D: Data, B: Backend> Infos for GGLWESwitchingKeyPrepared<D, B> {
 59    type Inner = VmpPMat<D, B>;
 60
 61    fn inner(&self) -> &Self::Inner {
 62        self.key.inner()
 63    }
 64
 65    fn basek(&self) -> usize {
 66        self.key.basek()
 67    }
 68
 69    fn k(&self) -> usize {
 70        self.key.k()
 71    }
 72}
 73
 74impl<D: Data, B: Backend> GGLWESwitchingKeyPrepared<D, B> {
 75    pub fn rank(&self) -> usize {
 76        self.key.data.cols_out() - 1
 77    }
 78
 79    pub fn rank_in(&self) -> usize {
 80        self.key.data.cols_in()
 81    }
 82
 83    pub fn rank_out(&self) -> usize {
 84        self.key.data.cols_out() - 1
 85    }
 86
 87    pub fn digits(&self) -> usize {
 88        self.key.digits()
 89    }
 90
 91    pub fn sk_degree_in(&self) -> usize {
 92        self.sk_in_n
 93    }
 94
 95    pub fn sk_degree_out(&self) -> usize {
 96        self.sk_out_n
 97    }
 98}
 99
100impl<D: DataMut, DR: DataRef, B: Backend> Prepare<B, GGLWESwitchingKey<DR>> for GGLWESwitchingKeyPrepared<D, B>
101where
102    Module<B>: VmpPrepare<B>,
103{
104    fn prepare(&mut self, module: &Module<B>, other: &GGLWESwitchingKey<DR>, scratch: &mut Scratch<B>) {
105        self.key.prepare(module, &other.key, scratch);
106        self.sk_in_n = other.sk_in_n;
107        self.sk_out_n = other.sk_out_n;
108    }
109}
110
111impl<D: DataRef, B: Backend> PrepareAlloc<B, GGLWESwitchingKeyPrepared<Vec<u8>, B>> for GGLWESwitchingKey<D>
112where
113    Module<B>: VmpPMatAlloc<B> + VmpPrepare<B>,
114{
115    fn prepare_alloc(&self, module: &Module<B>, scratch: &mut Scratch<B>) -> GGLWESwitchingKeyPrepared<Vec<u8>, B> {
116        let mut atk_prepared: GGLWESwitchingKeyPrepared<Vec<u8>, B> = GGLWESwitchingKeyPrepared::alloc(
117            module,
118            self.n(),
119            self.basek(),
120            self.k(),
121            self.rows(),
122            self.digits(),
123            self.rank_in(),
124            self.rank_out(),
125        );
126        atk_prepared.prepare(module, self, scratch);
127        atk_prepared
128    }
129}