1use poulpy_hal::{
  2    layouts::{Data, DataMut, DataRef, FillUniform, MatZnx, ReaderFrom, Reset, WriterTo},
  3    source::Source,
  4};
  5
  6use crate::layouts::{GGLWECiphertext, GLWECiphertext, Infos};
  7use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
  8
  9use std::fmt;
 10
 11#[derive(PartialEq, Eq, Clone)]
 12pub struct GGLWESwitchingKey<D: Data> {
 13    pub(crate) key: GGLWECiphertext<D>,
 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<D: DataRef> fmt::Debug for GGLWESwitchingKey<D> {
 19    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 20        write!(f, "{}", self)
 21    }
 22}
 23
 24impl<D: DataRef> fmt::Display for GGLWESwitchingKey<D> {
 25    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 26        write!(
 27            f,
 28            "(GLWESwitchingKey: sk_in_n={} sk_out_n={}) {}",
 29            self.sk_in_n, self.sk_out_n, self.key.data
 30        )
 31    }
 32}
 33
 34impl<D: DataMut> FillUniform for GGLWESwitchingKey<D> {
 35    fn fill_uniform(&mut self, log_bound: usize, source: &mut Source) {
 36        self.key.fill_uniform(log_bound, source);
 37    }
 38}
 39
 40impl<D: DataMut> Reset for GGLWESwitchingKey<D>
 41where
 42    MatZnx<D>: Reset,
 43{
 44    fn reset(&mut self) {
 45        self.key.reset();
 46        self.sk_in_n = 0;
 47        self.sk_out_n = 0;
 48    }
 49}
 50
 51impl GGLWESwitchingKey<Vec<u8>> {
 52    pub fn alloc(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank_in: usize, rank_out: usize) -> Self {
 53        GGLWESwitchingKey {
 54            key: GGLWECiphertext::alloc(n, basek, k, rows, digits, rank_in, rank_out),
 55            sk_in_n: 0,
 56            sk_out_n: 0,
 57        }
 58    }
 59
 60    pub fn bytes_of(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank_in: usize, rank_out: usize) -> usize {
 61        GGLWECiphertext::<Vec<u8>>::bytes_of(n, basek, k, rows, digits, rank_in, rank_out)
 62    }
 63}
 64
 65impl<D: Data> Infos for GGLWESwitchingKey<D> {
 66    type Inner = MatZnx<D>;
 67
 68    fn inner(&self) -> &Self::Inner {
 69        self.key.inner()
 70    }
 71
 72    fn basek(&self) -> usize {
 73        self.key.basek()
 74    }
 75
 76    fn k(&self) -> usize {
 77        self.key.k()
 78    }
 79}
 80
 81impl<D: Data> GGLWESwitchingKey<D> {
 82    pub fn rank(&self) -> usize {
 83        self.key.data.cols_out() - 1
 84    }
 85
 86    pub fn rank_in(&self) -> usize {
 87        self.key.data.cols_in()
 88    }
 89
 90    pub fn rank_out(&self) -> usize {
 91        self.key.data.cols_out() - 1
 92    }
 93
 94    pub fn digits(&self) -> usize {
 95        self.key.digits()
 96    }
 97
 98    pub fn sk_degree_in(&self) -> usize {
 99        self.sk_in_n
100    }
101
102    pub fn sk_degree_out(&self) -> usize {
103        self.sk_out_n
104    }
105}
106
107impl<D: DataRef> GGLWESwitchingKey<D> {
108    pub fn at(&self, row: usize, col: usize) -> GLWECiphertext<&[u8]> {
109        self.key.at(row, col)
110    }
111}
112
113impl<D: DataMut> GGLWESwitchingKey<D> {
114    pub fn at_mut(&mut self, row: usize, col: usize) -> GLWECiphertext<&mut [u8]> {
115        self.key.at_mut(row, col)
116    }
117}
118
119impl<D: DataMut> ReaderFrom for GGLWESwitchingKey<D> {
120    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
121        self.sk_in_n = reader.read_u64::<LittleEndian>()? as usize;
122        self.sk_out_n = reader.read_u64::<LittleEndian>()? as usize;
123        self.key.read_from(reader)
124    }
125}
126
127impl<D: DataRef> WriterTo for GGLWESwitchingKey<D> {
128    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
129        writer.write_u64::<LittleEndian>(self.sk_in_n as u64)?;
130        writer.write_u64::<LittleEndian>(self.sk_out_n as u64)?;
131        self.key.write_to(writer)
132    }
133}