1use poulpy_hal::layouts::{Data, DataMut, DataRef, ReaderFrom, VecZnx, WriterTo};
  2
  3use crate::{
  4    dist::Distribution,
  5    layouts::{Base2K, Degree, GLWEInfos, GLWEToMut, GLWEToRef, LWEInfos, Rank, TorusPrecision, GLWE},
  6    GetDistribution, GetDistributionMut,
  7};
  8
  9#[derive(PartialEq, Eq)]
 10pub struct GLWEPublicKey<D: Data> {
 11    pub key: GLWE<D>,
 12    pub(crate) dist: Distribution,
 13}
 14
 15impl<D: DataMut> GetDistributionMut for GLWEPublicKey<D> {
 16    fn dist_mut(&mut self) -> &mut Distribution {
 17        &mut self.dist
 18    }
 19}
 20
 21impl<D: DataRef> GetDistribution for GLWEPublicKey<D> {
 22    fn dist(&self) -> &Distribution {
 23        &self.dist
 24    }
 25}
 26
 27#[derive(PartialEq, Eq, Copy, Clone, Debug)]
 28pub struct GLWEPublicKeyLayout {
 29    pub n: Degree,
 30    pub base2k: Base2K,
 31    pub k: TorusPrecision,
 32    pub rank: Rank,
 33}
 34
 35impl<D: Data> LWEInfos for GLWEPublicKey<D> {
 36    fn base2k(&self) -> Base2K {
 37        self.key.base2k()
 38    }
 39
 40    fn k(&self) -> TorusPrecision {
 41        self.key.k()
 42    }
 43
 44    fn n(&self) -> Degree {
 45        self.key.n()
 46    }
 47
 48    fn size(&self) -> usize {
 49        self.key.size()
 50    }
 51}
 52
 53impl<D: Data> GLWEInfos for GLWEPublicKey<D> {
 54    fn rank(&self) -> Rank {
 55        self.key.rank()
 56    }
 57}
 58
 59impl LWEInfos for GLWEPublicKeyLayout {
 60    fn base2k(&self) -> Base2K {
 61        self.base2k
 62    }
 63
 64    fn k(&self) -> TorusPrecision {
 65        self.k
 66    }
 67
 68    fn n(&self) -> Degree {
 69        self.n
 70    }
 71
 72    fn size(&self) -> usize {
 73        self.k.0.div_ceil(self.base2k.0) as usize
 74    }
 75}
 76
 77impl GLWEInfos for GLWEPublicKeyLayout {
 78    fn rank(&self) -> Rank {
 79        self.rank
 80    }
 81}
 82
 83impl GLWEPublicKey<Vec<u8>> {
 84    pub fn alloc_from_infos<A>(infos: &A) -> Self
 85    where
 86        A: GLWEInfos,
 87    {
 88        Self::alloc(infos.n(), infos.base2k(), infos.k(), infos.rank())
 89    }
 90
 91    pub fn alloc(n: Degree, base2k: Base2K, k: TorusPrecision, rank: Rank) -> Self {
 92        GLWEPublicKey {
 93            key: GLWE::alloc(n, base2k, k, rank),
 94            dist: Distribution::NONE,
 95        }
 96    }
 97
 98    pub fn bytes_of_from_infos<A>(infos: &A) -> usize
 99    where
100        A: GLWEInfos,
101    {
102        Self::bytes_of(infos.n(), infos.base2k(), infos.k(), infos.rank())
103    }
104
105    pub fn bytes_of(n: Degree, base2k: Base2K, k: TorusPrecision, rank: Rank) -> usize {
106        VecZnx::bytes_of(n.into(), (rank + 1).into(), k.0.div_ceil(base2k.0) as usize)
107    }
108}
109
110impl<D: DataMut> ReaderFrom for GLWEPublicKey<D> {
111    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
112        match Distribution::read_from(reader) {
113            Ok(dist) => self.dist = dist,
114            Err(e) => return Err(e),
115        }
116        self.key.read_from(reader)
117    }
118}
119
120impl<D: DataRef> WriterTo for GLWEPublicKey<D> {
121    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
122        match self.dist.write_to(writer) {
123            Ok(()) => {}
124            Err(e) => return Err(e),
125        }
126        self.key.write_to(writer)
127    }
128}
129
130impl<D: DataRef> GLWEToRef for GLWEPublicKey<D> {
131    fn to_ref(&self) -> GLWE<&[u8]> {
132        self.key.to_ref()
133    }
134}
135
136impl<D: DataMut> GLWEToMut for GLWEPublicKey<D> {
137    fn to_mut(&mut self) -> GLWE<&mut [u8]> {
138        self.key.to_mut()
139    }
140}