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, GGLWECiphertextToMut, GGLWEInfos, GLWECiphertext, GLWEInfos, LWEInfos, Rank,
  8    TorusPrecision,
  9};
 10use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
 11
 12use std::fmt;
 13
 14#[derive(PartialEq, Eq, Copy, Clone, Debug)]
 15pub struct GGLWESwitchingKeyLayout {
 16    pub n: Degree,
 17    pub base2k: Base2K,
 18    pub k: TorusPrecision,
 19    pub rank_in: Rank,
 20    pub rank_out: Rank,
 21    pub dnum: Dnum,
 22    pub dsize: Dsize,
 23}
 24
 25impl LWEInfos for GGLWESwitchingKeyLayout {
 26    fn n(&self) -> Degree {
 27        self.n
 28    }
 29
 30    fn base2k(&self) -> Base2K {
 31        self.base2k
 32    }
 33
 34    fn k(&self) -> TorusPrecision {
 35        self.k
 36    }
 37}
 38
 39impl GLWEInfos for GGLWESwitchingKeyLayout {
 40    fn rank(&self) -> Rank {
 41        self.rank_out()
 42    }
 43}
 44
 45impl GGLWEInfos for GGLWESwitchingKeyLayout {
 46    fn rank_in(&self) -> Rank {
 47        self.rank_in
 48    }
 49
 50    fn rank_out(&self) -> Rank {
 51        self.rank_out
 52    }
 53
 54    fn dsize(&self) -> Dsize {
 55        self.dsize
 56    }
 57
 58    fn dnum(&self) -> Dnum {
 59        self.dnum
 60    }
 61}
 62
 63#[derive(PartialEq, Eq, Clone)]
 64pub struct GGLWESwitchingKey<D: Data> {
 65    pub(crate) key: GGLWECiphertext<D>,
 66    pub(crate) sk_in_n: usize,  // Degree of sk_in
 67    pub(crate) sk_out_n: usize, // Degree of sk_out
 68}
 69
 70impl<D: Data> LWEInfos for GGLWESwitchingKey<D> {
 71    fn n(&self) -> Degree {
 72        self.key.n()
 73    }
 74
 75    fn base2k(&self) -> Base2K {
 76        self.key.base2k()
 77    }
 78
 79    fn k(&self) -> TorusPrecision {
 80        self.key.k()
 81    }
 82
 83    fn size(&self) -> usize {
 84        self.key.size()
 85    }
 86}
 87
 88impl<D: Data> GLWEInfos for GGLWESwitchingKey<D> {
 89    fn rank(&self) -> Rank {
 90        self.rank_out()
 91    }
 92}
 93
 94impl<D: Data> GGLWEInfos for GGLWESwitchingKey<D> {
 95    fn rank_in(&self) -> Rank {
 96        self.key.rank_in()
 97    }
 98
 99    fn rank_out(&self) -> Rank {
100        self.key.rank_out()
101    }
102
103    fn dsize(&self) -> Dsize {
104        self.key.dsize()
105    }
106
107    fn dnum(&self) -> Dnum {
108        self.key.dnum()
109    }
110}
111
112impl<D: DataRef> fmt::Debug for GGLWESwitchingKey<D> {
113    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
114        write!(f, "{self}")
115    }
116}
117
118impl<D: DataRef> fmt::Display for GGLWESwitchingKey<D> {
119    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
120        write!(
121            f,
122            "(GLWESwitchingKey: sk_in_n={} sk_out_n={}) {}",
123            self.sk_in_n,
124            self.sk_out_n,
125            self.key.data()
126        )
127    }
128}
129
130impl<D: DataMut> FillUniform for GGLWESwitchingKey<D> {
131    fn fill_uniform(&mut self, log_bound: usize, source: &mut Source) {
132        self.key.fill_uniform(log_bound, source);
133    }
134}
135
136impl GGLWESwitchingKey<Vec<u8>> {
137    pub fn alloc<A>(infos: &A) -> Self
138    where
139        A: GGLWEInfos,
140    {
141        GGLWESwitchingKey {
142            key: GGLWECiphertext::alloc(infos),
143            sk_in_n: 0,
144            sk_out_n: 0,
145        }
146    }
147
148    pub fn alloc_with(
149        n: Degree,
150        base2k: Base2K,
151        k: TorusPrecision,
152        rank_in: Rank,
153        rank_out: Rank,
154        dnum: Dnum,
155        dsize: Dsize,
156    ) -> Self {
157        GGLWESwitchingKey {
158            key: GGLWECiphertext::alloc_with(n, base2k, k, rank_in, rank_out, dnum, dsize),
159            sk_in_n: 0,
160            sk_out_n: 0,
161        }
162    }
163
164    pub fn alloc_bytes<A>(infos: &A) -> usize
165    where
166        A: GGLWEInfos,
167    {
168        GGLWECiphertext::alloc_bytes(infos)
169    }
170
171    pub fn alloc_bytes_with(
172        n: Degree,
173        base2k: Base2K,
174        k: TorusPrecision,
175        rank_in: Rank,
176        rank_out: Rank,
177        dnum: Dnum,
178        dsize: Dsize,
179    ) -> usize {
180        GGLWECiphertext::alloc_bytes_with(n, base2k, k, rank_in, rank_out, dnum, dsize)
181    }
182}
183
184pub trait GGLWESwitchingKeyToMut {
185    fn to_mut(&mut self) -> GGLWESwitchingKey<&mut [u8]>;
186}
187
188impl<D: DataMut> GGLWESwitchingKeyToMut for GGLWESwitchingKey<D>
189where
190    GGLWECiphertext<D>: GGLWECiphertextToMut,
191{
192    fn to_mut(&mut self) -> GGLWESwitchingKey<&mut [u8]> {
193        GGLWESwitchingKey {
194            key: self.key.to_mut(),
195            sk_in_n: self.sk_in_n,
196            sk_out_n: self.sk_out_n,
197        }
198    }
199}
200
201impl<D: DataRef> GGLWESwitchingKey<D> {
202    pub fn at(&self, row: usize, col: usize) -> GLWECiphertext<&[u8]> {
203        self.key.at(row, col)
204    }
205}
206
207impl<D: DataMut> GGLWESwitchingKey<D> {
208    pub fn at_mut(&mut self, row: usize, col: usize) -> GLWECiphertext<&mut [u8]> {
209        self.key.at_mut(row, col)
210    }
211}
212
213impl<D: DataMut> ReaderFrom for GGLWESwitchingKey<D> {
214    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
215        self.sk_in_n = reader.read_u64::<LittleEndian>()? as usize;
216        self.sk_out_n = reader.read_u64::<LittleEndian>()? as usize;
217        self.key.read_from(reader)
218    }
219}
220
221impl<D: DataRef> WriterTo for GGLWESwitchingKey<D> {
222    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
223        writer.write_u64::<LittleEndian>(self.sk_in_n as u64)?;
224        writer.write_u64::<LittleEndian>(self.sk_out_n as u64)?;
225        self.key.write_to(writer)
226    }
227}