1use poulpy_hal::layouts::{Data, DataMut, DataRef, ReaderFrom, VecZnx, VecZnxToMut, VecZnxToRef, WriterTo, ZnxInfos};
  2
  3use crate::{
  4    dist::Distribution,
  5    layouts::{Base2K, Degree, GLWEInfos, LWEInfos, Rank, TorusPrecision},
  6};
  7use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
  8
  9#[derive(PartialEq, Eq)]
 10pub struct GLWEPublicKey<D: Data> {
 11    pub(crate) data: VecZnx<D>,
 12    pub(crate) base2k: Base2K,
 13    pub(crate) k: TorusPrecision,
 14    pub(crate) dist: Distribution,
 15}
 16
 17#[derive(PartialEq, Eq, Copy, Clone, Debug)]
 18pub struct GLWEPublicKeyLayout {
 19    pub n: Degree,
 20    pub base2k: Base2K,
 21    pub k: TorusPrecision,
 22    pub rank: Rank,
 23}
 24
 25pub trait GetDist {
 26    fn get_dist(&self) -> Distribution;
 27}
 28
 29impl<D: DataRef> GetDist for GLWEPublicKey<D> {
 30    fn get_dist(&self) -> Distribution {
 31        self.dist
 32    }
 33}
 34
 35impl<D: Data> LWEInfos for GLWEPublicKey<D> {
 36    fn base2k(&self) -> Base2K {
 37        self.base2k
 38    }
 39
 40    fn k(&self) -> TorusPrecision {
 41        self.k
 42    }
 43
 44    fn n(&self) -> Degree {
 45        Degree(self.data.n() as u32)
 46    }
 47
 48    fn size(&self) -> usize {
 49        self.data.size()
 50    }
 51}
 52
 53impl<D: Data> GLWEInfos for GLWEPublicKey<D> {
 54    fn rank(&self) -> Rank {
 55        Rank(self.data.cols() as u32 - 1)
 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<A>(infos: &A) -> Self
 85    where
 86        A: GLWEInfos,
 87    {
 88        Self::alloc_with(infos.n(), infos.base2k(), infos.k(), infos.rank())
 89    }
 90
 91    pub fn alloc_with(n: Degree, base2k: Base2K, k: TorusPrecision, rank: Rank) -> Self {
 92        Self {
 93            data: VecZnx::alloc(n.into(), (rank + 1).into(), k.0.div_ceil(base2k.0) as usize),
 94            base2k,
 95            k,
 96            dist: Distribution::NONE,
 97        }
 98    }
 99
100    pub fn alloc_bytes<A>(infos: &A) -> usize
101    where
102        A: GLWEInfos,
103    {
104        Self::alloc_bytes_with(infos.n(), infos.base2k(), infos.k(), infos.rank())
105    }
106
107    pub fn alloc_bytes_with(n: Degree, base2k: Base2K, k: TorusPrecision, rank: Rank) -> usize {
108        VecZnx::alloc_bytes(n.into(), (rank + 1).into(), k.0.div_ceil(base2k.0) as usize)
109    }
110}
111
112impl<D: DataMut> ReaderFrom for GLWEPublicKey<D> {
113    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
114        self.k = TorusPrecision(reader.read_u32::<LittleEndian>()?);
115        self.base2k = Base2K(reader.read_u32::<LittleEndian>()?);
116        match Distribution::read_from(reader) {
117            Ok(dist) => self.dist = dist,
118            Err(e) => return Err(e),
119        }
120        self.data.read_from(reader)
121    }
122}
123
124impl<D: DataRef> WriterTo for GLWEPublicKey<D> {
125    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
126        writer.write_u32::<LittleEndian>(self.k.0)?;
127        writer.write_u32::<LittleEndian>(self.base2k.0)?;
128        match self.dist.write_to(writer) {
129            Ok(()) => {}
130            Err(e) => return Err(e),
131        }
132        self.data.write_to(writer)
133    }
134}
135
136pub trait GLWEPublicKeyToRef {
137    fn to_ref(&self) -> GLWEPublicKey<&[u8]>;
138}
139
140impl<D: DataRef> GLWEPublicKeyToRef for GLWEPublicKey<D> {
141    fn to_ref(&self) -> GLWEPublicKey<&[u8]> {
142        GLWEPublicKey {
143            data: self.data.to_ref(),
144            base2k: self.base2k,
145            k: self.k,
146            dist: self.dist,
147        }
148    }
149}
150
151pub trait GLWEPublicKeyToMut {
152    fn to_mut(&mut self) -> GLWEPublicKey<&mut [u8]>;
153}
154
155impl<D: DataMut> GLWEPublicKeyToMut for GLWEPublicKey<D> {
156    fn to_mut(&mut self) -> GLWEPublicKey<&mut [u8]> {
157        GLWEPublicKey {
158            base2k: self.base2k,
159            k: self.k,
160            dist: self.dist,
161            data: self.data.to_mut(),
162        }
163    }
164}