1use poulpy_hal::{
  2    layouts::{Data, DataMut, DataRef, FillUniform, ReaderFrom, WriterTo},
  3    source::Source,
  4};
  5
  6use crate::layouts::{
  7    Base2K, Degree, Dnum, Dsize, GGLWE, GGLWEInfos, GGLWEToMut, GGLWEToRef, GLWEInfos, LWEInfos, Rank, TorusPrecision,
  8};
  9use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
 10
 11use std::fmt;
 12
 13#[derive(PartialEq, Eq, Copy, Clone, Debug)]
 14pub struct GGLWEToGGSWKeyLayout {
 15    pub n: Degree,
 16    pub base2k: Base2K,
 17    pub k: TorusPrecision,
 18    pub rank: Rank,
 19    pub dnum: Dnum,
 20    pub dsize: Dsize,
 21}
 22
 23#[derive(PartialEq, Eq, Clone)]
 24pub struct GGLWEToGGSWKey<D: Data> {
 25    pub(crate) keys: Vec<GGLWE<D>>,
 26}
 27
 28impl<D: Data> LWEInfos for GGLWEToGGSWKey<D> {
 29    fn n(&self) -> Degree {
 30        self.keys[0].n()
 31    }
 32
 33    fn base2k(&self) -> Base2K {
 34        self.keys[0].base2k()
 35    }
 36
 37    fn k(&self) -> TorusPrecision {
 38        self.keys[0].k()
 39    }
 40
 41    fn size(&self) -> usize {
 42        self.keys[0].size()
 43    }
 44}
 45
 46impl<D: Data> GLWEInfos for GGLWEToGGSWKey<D> {
 47    fn rank(&self) -> Rank {
 48        self.keys[0].rank_out()
 49    }
 50}
 51
 52impl<D: Data> GGLWEInfos for GGLWEToGGSWKey<D> {
 53    fn rank_in(&self) -> Rank {
 54        self.rank_out()
 55    }
 56
 57    fn rank_out(&self) -> Rank {
 58        self.keys[0].rank_out()
 59    }
 60
 61    fn dsize(&self) -> Dsize {
 62        self.keys[0].dsize()
 63    }
 64
 65    fn dnum(&self) -> Dnum {
 66        self.keys[0].dnum()
 67    }
 68}
 69
 70impl LWEInfos for GGLWEToGGSWKeyLayout {
 71    fn n(&self) -> Degree {
 72        self.n
 73    }
 74
 75    fn base2k(&self) -> Base2K {
 76        self.base2k
 77    }
 78
 79    fn k(&self) -> TorusPrecision {
 80        self.k
 81    }
 82}
 83
 84impl GLWEInfos for GGLWEToGGSWKeyLayout {
 85    fn rank(&self) -> Rank {
 86        self.rank_out()
 87    }
 88}
 89
 90impl GGLWEInfos for GGLWEToGGSWKeyLayout {
 91    fn rank_in(&self) -> Rank {
 92        self.rank
 93    }
 94
 95    fn dsize(&self) -> Dsize {
 96        self.dsize
 97    }
 98
 99    fn rank_out(&self) -> Rank {
100        self.rank
101    }
102
103    fn dnum(&self) -> Dnum {
104        self.dnum
105    }
106}
107
108impl<D: DataRef> fmt::Debug for GGLWEToGGSWKey<D> {
109    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
110        write!(f, "{self}")
111    }
112}
113
114impl<D: DataMut> FillUniform for GGLWEToGGSWKey<D> {
115    fn fill_uniform(&mut self, log_bound: usize, source: &mut Source) {
116        self.keys
117            .iter_mut()
118            .for_each(|key: &mut GGLWE<D>| key.fill_uniform(log_bound, source))
119    }
120}
121
122impl<D: DataRef> fmt::Display for GGLWEToGGSWKey<D> {
123    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
124        writeln!(f, "(GGLWEToGGSWKey)",)?;
125        for (i, key) in self.keys.iter().enumerate() {
126            write!(f, "{i}: {key}")?;
127        }
128        Ok(())
129    }
130}
131
132impl GGLWEToGGSWKey<Vec<u8>> {
133    pub fn alloc_from_infos<A>(infos: &A) -> Self
134    where
135        A: GGLWEInfos,
136    {
137        assert_eq!(
138            infos.rank_in(),
139            infos.rank_out(),
140            "rank_in != rank_out is not supported for GGLWEToGGSWKey"
141        );
142        Self::alloc(
143            infos.n(),
144            infos.base2k(),
145            infos.k(),
146            infos.rank(),
147            infos.dnum(),
148            infos.dsize(),
149        )
150    }
151
152    pub fn alloc(n: Degree, base2k: Base2K, k: TorusPrecision, rank: Rank, dnum: Dnum, dsize: Dsize) -> Self {
153        GGLWEToGGSWKey {
154            keys: (0..rank.as_usize())
155                .map(|_| GGLWE::alloc(n, base2k, k, rank, rank, dnum, dsize))
156                .collect(),
157        }
158    }
159
160    pub fn bytes_of_from_infos<A>(infos: &A) -> usize
161    where
162        A: GGLWEInfos,
163    {
164        assert_eq!(
165            infos.rank_in(),
166            infos.rank_out(),
167            "rank_in != rank_out is not supported for GGLWEToGGSWKey"
168        );
169        Self::bytes_of(
170            infos.n(),
171            infos.base2k(),
172            infos.k(),
173            infos.rank(),
174            infos.dnum(),
175            infos.dsize(),
176        )
177    }
178
179    pub fn bytes_of(n: Degree, base2k: Base2K, k: TorusPrecision, rank: Rank, dnum: Dnum, dsize: Dsize) -> usize {
180        rank.as_usize() * GGLWE::bytes_of(n, base2k, k, rank, rank, dnum, dsize)
181    }
182}
183
184impl<D: DataMut> GGLWEToGGSWKey<D> {
185    // Returns a mutable reference to GGLWE_{s}([s[i]*s[0], s[i]*s[1], ..., s[i]*s[rank]])
186    pub fn at_mut(&mut self, i: usize) -> &mut GGLWE<D> {
187        assert!((i as u32) < self.rank());
188        &mut self.keys[i]
189    }
190}
191
192impl<D: DataRef> GGLWEToGGSWKey<D> {
193    // Returns a reference to GGLWE_{s}(s[i] * s[j])
194    pub fn at(&self, i: usize) -> &GGLWE<D> {
195        assert!((i as u32) < self.rank());
196        &self.keys[i]
197    }
198}
199
200impl<D: DataMut> ReaderFrom for GGLWEToGGSWKey<D> {
201    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
202        let len: usize = reader.read_u64::<LittleEndian>()? as usize;
203        if self.keys.len() != len {
204            return Err(std::io::Error::new(
205                std::io::ErrorKind::InvalidData,
206                format!("self.keys.len()={} != read len={}", self.keys.len(), len),
207            ));
208        }
209        for key in &mut self.keys {
210            key.read_from(reader)?;
211        }
212        Ok(())
213    }
214}
215
216impl<D: DataRef> WriterTo for GGLWEToGGSWKey<D> {
217    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
218        writer.write_u64::<LittleEndian>(self.keys.len() as u64)?;
219        for key in &self.keys {
220            key.write_to(writer)?;
221        }
222        Ok(())
223    }
224}
225
226pub trait GGLWEToGGSWKeyToRef {
227    fn to_ref(&self) -> GGLWEToGGSWKey<&[u8]>;
228}
229
230impl<D: DataRef> GGLWEToGGSWKeyToRef for GGLWEToGGSWKey<D>
231where
232    GGLWE<D>: GGLWEToRef,
233{
234    fn to_ref(&self) -> GGLWEToGGSWKey<&[u8]> {
235        GGLWEToGGSWKey {
236            keys: self.keys.iter().map(|c| c.to_ref()).collect(),
237        }
238    }
239}
240
241pub trait GGLWEToGGSWKeyToMut {
242    fn to_mut(&mut self) -> GGLWEToGGSWKey<&mut [u8]>;
243}
244
245impl<D: DataMut> GGLWEToGGSWKeyToMut for GGLWEToGGSWKey<D>
246where
247    GGLWE<D>: GGLWEToMut,
248{
249    fn to_mut(&mut self) -> GGLWEToGGSWKey<&mut [u8]> {
250        GGLWEToGGSWKey {
251            keys: self.keys.iter_mut().map(|c| c.to_mut()).collect(),
252        }
253    }
254}