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