1use poulpy_hal::{
  2    layouts::{Data, DataMut, DataRef, FillUniform, ReaderFrom, WriterTo},
  3    source::Source,
  4};
  5
  6use crate::layouts::{
  7    Base2K, Degree, Dnum, Dsize, GGLWECiphertext, GGLWEInfos, GLWECiphertext, GLWEInfos, LWEInfos, Rank, TorusPrecision,
  8};
  9use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
 10
 11use std::fmt;
 12
 13#[derive(PartialEq, Eq, Copy, Clone, Debug)]
 14pub struct GGLWESwitchingKeyLayout {
 15    pub n: Degree,
 16    pub base2k: Base2K,
 17    pub k: TorusPrecision,
 18    pub rank_in: Rank,
 19    pub rank_out: Rank,
 20    pub dnum: Dnum,
 21    pub dsize: Dsize,
 22}
 23
 24impl LWEInfos for GGLWESwitchingKeyLayout {
 25    fn n(&self) -> Degree {
 26        self.n
 27    }
 28
 29    fn base2k(&self) -> Base2K {
 30        self.base2k
 31    }
 32
 33    fn k(&self) -> TorusPrecision {
 34        self.k
 35    }
 36}
 37
 38impl GLWEInfos for GGLWESwitchingKeyLayout {
 39    fn rank(&self) -> Rank {
 40        self.rank_out()
 41    }
 42}
 43
 44impl GGLWEInfos for GGLWESwitchingKeyLayout {
 45    fn rank_in(&self) -> Rank {
 46        self.rank_in
 47    }
 48
 49    fn rank_out(&self) -> Rank {
 50        self.rank_out
 51    }
 52
 53    fn dsize(&self) -> Dsize {
 54        self.dsize
 55    }
 56
 57    fn dnum(&self) -> Dnum {
 58        self.dnum
 59    }
 60}
 61
 62#[derive(PartialEq, Eq, Clone)]
 63pub struct GGLWESwitchingKey<D: Data> {
 64    pub(crate) key: GGLWECiphertext<D>,
 65    pub(crate) sk_in_n: usize,  // Degree of sk_in
 66    pub(crate) sk_out_n: usize, // Degree of sk_out
 67}
 68
 69impl<D: Data> LWEInfos for GGLWESwitchingKey<D> {
 70    fn n(&self) -> Degree {
 71        self.key.n()
 72    }
 73
 74    fn base2k(&self) -> Base2K {
 75        self.key.base2k()
 76    }
 77
 78    fn k(&self) -> TorusPrecision {
 79        self.key.k()
 80    }
 81
 82    fn size(&self) -> usize {
 83        self.key.size()
 84    }
 85}
 86
 87impl<D: Data> GLWEInfos for GGLWESwitchingKey<D> {
 88    fn rank(&self) -> Rank {
 89        self.rank_out()
 90    }
 91}
 92
 93impl<D: Data> GGLWEInfos for GGLWESwitchingKey<D> {
 94    fn rank_in(&self) -> Rank {
 95        self.key.rank_in()
 96    }
 97
 98    fn rank_out(&self) -> Rank {
 99        self.key.rank_out()
100    }
101
102    fn dsize(&self) -> Dsize {
103        self.key.dsize()
104    }
105
106    fn dnum(&self) -> Dnum {
107        self.key.dnum()
108    }
109}
110
111impl<D: DataRef> fmt::Debug for GGLWESwitchingKey<D> {
112    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
113        write!(f, "{self}")
114    }
115}
116
117impl<D: DataRef> fmt::Display for GGLWESwitchingKey<D> {
118    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
119        write!(
120            f,
121            "(GLWESwitchingKey: sk_in_n={} sk_out_n={}) {}",
122            self.sk_in_n,
123            self.sk_out_n,
124            self.key.data()
125        )
126    }
127}
128
129impl<D: DataMut> FillUniform for GGLWESwitchingKey<D> {
130    fn fill_uniform(&mut self, log_bound: usize, source: &mut Source) {
131        self.key.fill_uniform(log_bound, source);
132    }
133}
134
135impl GGLWESwitchingKey<Vec<u8>> {
136    pub fn alloc<A>(infos: &A) -> Self
137    where
138        A: GGLWEInfos,
139    {
140        GGLWESwitchingKey {
141            key: GGLWECiphertext::alloc(infos),
142            sk_in_n: 0,
143            sk_out_n: 0,
144        }
145    }
146
147    pub fn alloc_with(
148        n: Degree,
149        base2k: Base2K,
150        k: TorusPrecision,
151        rank_in: Rank,
152        rank_out: Rank,
153        dnum: Dnum,
154        dsize: Dsize,
155    ) -> Self {
156        GGLWESwitchingKey {
157            key: GGLWECiphertext::alloc_with(n, base2k, k, rank_in, rank_out, dnum, dsize),
158            sk_in_n: 0,
159            sk_out_n: 0,
160        }
161    }
162
163    pub fn alloc_bytes<A>(infos: &A) -> usize
164    where
165        A: GGLWEInfos,
166    {
167        GGLWECiphertext::alloc_bytes(infos)
168    }
169
170    pub fn alloc_bytes_with(
171        n: Degree,
172        base2k: Base2K,
173        k: TorusPrecision,
174        rank_in: Rank,
175        rank_out: Rank,
176        dnum: Dnum,
177        dsize: Dsize,
178    ) -> usize {
179        GGLWECiphertext::alloc_bytes_with(n, base2k, k, rank_in, rank_out, dnum, dsize)
180    }
181}
182
183impl<D: DataRef> GGLWESwitchingKey<D> {
184    pub fn at(&self, row: usize, col: usize) -> GLWECiphertext<&[u8]> {
185        self.key.at(row, col)
186    }
187}
188
189impl<D: DataMut> GGLWESwitchingKey<D> {
190    pub fn at_mut(&mut self, row: usize, col: usize) -> GLWECiphertext<&mut [u8]> {
191        self.key.at_mut(row, col)
192    }
193}
194
195impl<D: DataMut> ReaderFrom for GGLWESwitchingKey<D> {
196    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
197        self.sk_in_n = reader.read_u64::<LittleEndian>()? as usize;
198        self.sk_out_n = reader.read_u64::<LittleEndian>()? as usize;
199        self.key.read_from(reader)
200    }
201}
202
203impl<D: DataRef> WriterTo for GGLWESwitchingKey<D> {
204    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
205        writer.write_u64::<LittleEndian>(self.sk_in_n as u64)?;
206        writer.write_u64::<LittleEndian>(self.sk_out_n as u64)?;
207        self.key.write_to(writer)
208    }
209}