1use poulpy_hal::{
  2    api::{VecZnxCopy, VecZnxFillUniform},
  3    layouts::{
  4        Backend, Data, DataMut, DataRef, FillUniform, MatZnx, MatZnxToMut, MatZnxToRef, Module, ReaderFrom, WriterTo, ZnxInfos,
  5    },
  6    source::Source,
  7};
  8
  9use crate::layouts::{
 10    Base2K, Degree, Dnum, Dsize, GGLWECiphertext, GGLWEInfos, GLWEInfos, LWEInfos, Rank, TorusPrecision,
 11    compressed::{Decompress, GLWECiphertextCompressed},
 12};
 13use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
 14use std::fmt;
 15
 16#[derive(PartialEq, Eq, Clone)]
 17pub struct GGLWECiphertextCompressed<D: Data> {
 18    pub(crate) data: MatZnx<D>,
 19    pub(crate) base2k: Base2K,
 20    pub(crate) k: TorusPrecision,
 21    pub(crate) rank_out: Rank,
 22    pub(crate) dsize: Dsize,
 23    pub(crate) seed: Vec<[u8; 32]>,
 24}
 25
 26impl<D: Data> LWEInfos for GGLWECiphertextCompressed<D> {
 27    fn n(&self) -> Degree {
 28        Degree(self.data.n() as u32)
 29    }
 30
 31    fn base2k(&self) -> Base2K {
 32        self.base2k
 33    }
 34
 35    fn k(&self) -> TorusPrecision {
 36        self.k
 37    }
 38
 39    fn size(&self) -> usize {
 40        self.data.size()
 41    }
 42}
 43impl<D: Data> GLWEInfos for GGLWECiphertextCompressed<D> {
 44    fn rank(&self) -> Rank {
 45        self.rank_out()
 46    }
 47}
 48
 49impl<D: Data> GGLWEInfos for GGLWECiphertextCompressed<D> {
 50    fn rank_in(&self) -> Rank {
 51        Rank(self.data.cols_in() as u32)
 52    }
 53
 54    fn rank_out(&self) -> Rank {
 55        self.rank_out
 56    }
 57
 58    fn dsize(&self) -> Dsize {
 59        self.dsize
 60    }
 61
 62    fn dnum(&self) -> Dnum {
 63        Dnum(self.data.rows() as u32)
 64    }
 65}
 66
 67impl<D: DataRef> fmt::Debug for GGLWECiphertextCompressed<D> {
 68    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 69        write!(f, "{self}")
 70    }
 71}
 72
 73impl<D: DataMut> FillUniform for GGLWECiphertextCompressed<D> {
 74    fn fill_uniform(&mut self, log_bound: usize, source: &mut Source) {
 75        self.data.fill_uniform(log_bound, source);
 76    }
 77}
 78
 79impl<D: DataRef> fmt::Display for GGLWECiphertextCompressed<D> {
 80    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 81        write!(
 82            f,
 83            "(GGLWECiphertextCompressed: base2k={} k={} dsize={}) {}",
 84            self.base2k.0, self.k.0, self.dsize.0, self.data
 85        )
 86    }
 87}
 88
 89impl GGLWECiphertextCompressed<Vec<u8>> {
 90    pub fn alloc<A>(infos: &A) -> Self
 91    where
 92        A: GGLWEInfos,
 93    {
 94        Self::alloc_with(
 95            infos.n(),
 96            infos.base2k(),
 97            infos.k(),
 98            infos.rank_in(),
 99            infos.rank_out(),
100            infos.dnum(),
101            infos.dsize(),
102        )
103    }
104
105    pub fn alloc_with(
106        n: Degree,
107        base2k: Base2K,
108        k: TorusPrecision,
109        rank_in: Rank,
110        rank_out: Rank,
111        dnum: Dnum,
112        dsize: Dsize,
113    ) -> Self {
114        let size: usize = k.0.div_ceil(base2k.0) as usize;
115        debug_assert!(
116            size as u32 > dsize.0,
117            "invalid gglwe: ceil(k/base2k): {size} <= dsize: {}",
118            dsize.0
119        );
120
121        assert!(
122            dnum.0 * dsize.0 <= size as u32,
123            "invalid gglwe: dnum: {} * dsize:{} > ceil(k/base2k): {size}",
124            dnum.0,
125            dsize.0,
126        );
127
128        Self {
129            data: MatZnx::alloc(
130                n.into(),
131                dnum.into(),
132                rank_in.into(),
133                1,
134                k.0.div_ceil(base2k.0) as usize,
135            ),
136            k,
137            base2k,
138            dsize,
139            rank_out,
140            seed: vec![[0u8; 32]; (dnum.0 * rank_in.0) as usize],
141        }
142    }
143
144    pub fn alloc_bytes<A>(infos: &A) -> usize
145    where
146        A: GGLWEInfos,
147    {
148        Self::alloc_bytes_with(
149            infos.n(),
150            infos.base2k(),
151            infos.k(),
152            infos.rank_in(),
153            infos.dnum(),
154            infos.dsize(),
155        )
156    }
157
158    pub fn alloc_bytes_with(n: Degree, base2k: Base2K, k: TorusPrecision, rank_in: Rank, dnum: Dnum, dsize: Dsize) -> usize {
159        let size: usize = k.0.div_ceil(base2k.0) as usize;
160        debug_assert!(
161            size as u32 > dsize.0,
162            "invalid gglwe: ceil(k/base2k): {size} <= dsize: {}",
163            dsize.0
164        );
165
166        assert!(
167            dnum.0 * dsize.0 <= size as u32,
168            "invalid gglwe: dnum: {} * dsize:{} > ceil(k/base2k): {size}",
169            dnum.0,
170            dsize.0,
171        );
172
173        MatZnx::alloc_bytes(
174            n.into(),
175            dnum.into(),
176            rank_in.into(),
177            1,
178            k.0.div_ceil(base2k.0) as usize,
179        )
180    }
181}
182
183impl<D: DataRef> GGLWECiphertextCompressed<D> {
184    pub(crate) fn at(&self, row: usize, col: usize) -> GLWECiphertextCompressed<&[u8]> {
185        let rank_in: usize = self.rank_in().into();
186        GLWECiphertextCompressed {
187            data: self.data.at(row, col),
188            k: self.k,
189            base2k: self.base2k,
190            rank: self.rank_out,
191            seed: self.seed[rank_in * row + col],
192        }
193    }
194}
195
196impl<D: DataMut> GGLWECiphertextCompressed<D> {
197    pub(crate) fn at_mut(&mut self, row: usize, col: usize) -> GLWECiphertextCompressed<&mut [u8]> {
198        let rank_in: usize = self.rank_in().into();
199        GLWECiphertextCompressed {
200            k: self.k,
201            base2k: self.base2k,
202            rank: self.rank_out,
203            data: self.data.at_mut(row, col),
204            seed: self.seed[rank_in * row + col], // Warning: value is copied and not borrow mut
205        }
206    }
207}
208
209impl<D: DataMut> ReaderFrom for GGLWECiphertextCompressed<D> {
210    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
211        self.k = TorusPrecision(reader.read_u32::<LittleEndian>()?);
212        self.base2k = Base2K(reader.read_u32::<LittleEndian>()?);
213        self.dsize = Dsize(reader.read_u32::<LittleEndian>()?);
214        self.rank_out = Rank(reader.read_u32::<LittleEndian>()?);
215        let seed_len: u32 = reader.read_u32::<LittleEndian>()?;
216        self.seed = vec![[0u8; 32]; seed_len as usize];
217        for s in &mut self.seed {
218            reader.read_exact(s)?;
219        }
220        self.data.read_from(reader)
221    }
222}
223
224impl<D: DataRef> WriterTo for GGLWECiphertextCompressed<D> {
225    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
226        writer.write_u32::<LittleEndian>(self.k.into())?;
227        writer.write_u32::<LittleEndian>(self.base2k.into())?;
228        writer.write_u32::<LittleEndian>(self.dsize.into())?;
229        writer.write_u32::<LittleEndian>(self.rank_out.into())?;
230        writer.write_u32::<LittleEndian>(self.seed.len() as u32)?;
231        for s in &self.seed {
232            writer.write_all(s)?;
233        }
234        self.data.write_to(writer)
235    }
236}
237
238impl<D: DataMut, B: Backend, DR: DataRef> Decompress<B, GGLWECiphertextCompressed<DR>> for GGLWECiphertext<D>
239where
240    Module<B>: VecZnxFillUniform + VecZnxCopy,
241{
242    fn decompress(&mut self, module: &Module<B>, other: &GGLWECiphertextCompressed<DR>) {
243        #[cfg(debug_assertions)]
244        {
245            assert_eq!(
246                self.n(),
247                other.n(),
248                "invalid receiver: self.n()={} != other.n()={}",
249                self.n(),
250                other.n()
251            );
252            assert_eq!(
253                self.size(),
254                other.size(),
255                "invalid receiver: self.size()={} != other.size()={}",
256                self.size(),
257                other.size()
258            );
259            assert_eq!(
260                self.rank_in(),
261                other.rank_in(),
262                "invalid receiver: self.rank_in()={} != other.rank_in()={}",
263                self.rank_in(),
264                other.rank_in()
265            );
266            assert_eq!(
267                self.rank_out(),
268                other.rank_out(),
269                "invalid receiver: self.rank_out()={} != other.rank_out()={}",
270                self.rank_out(),
271                other.rank_out()
272            );
273
274            assert_eq!(
275                self.dnum(),
276                other.dnum(),
277                "invalid receiver: self.dnum()={} != other.dnum()={}",
278                self.dnum(),
279                other.dnum()
280            );
281        }
282
283        let rank_in: usize = self.rank_in().into();
284        let dnum: usize = self.dnum().into();
285
286        (0..rank_in).for_each(|col_i| {
287            (0..dnum).for_each(|row_i| {
288                self.at_mut(row_i, col_i)
289                    .decompress(module, &other.at(row_i, col_i));
290            });
291        });
292    }
293}
294
295pub trait GGLWECiphertextCompressedToMut {
296    fn to_mut(&mut self) -> GGLWECiphertextCompressed<&mut [u8]>;
297}
298
299impl<D: DataMut> GGLWECiphertextCompressedToMut for GGLWECiphertextCompressed<D> {
300    fn to_mut(&mut self) -> GGLWECiphertextCompressed<&mut [u8]> {
301        GGLWECiphertextCompressed {
302            k: self.k(),
303            base2k: self.base2k(),
304            dsize: self.dsize(),
305            seed: self.seed.clone(),
306            rank_out: self.rank_out,
307            data: self.data.to_mut(),
308        }
309    }
310}
311
312pub trait GGLWECiphertextCompressedToRef {
313    fn to_ref(&self) -> GGLWECiphertextCompressed<&[u8]>;
314}
315
316impl<D: DataMut> GGLWECiphertextCompressedToRef for GGLWECiphertextCompressed<D> {
317    fn to_ref(&self) -> GGLWECiphertextCompressed<&[u8]> {
318        GGLWECiphertextCompressed {
319            k: self.k(),
320            base2k: self.base2k(),
321            dsize: self.dsize(),
322            seed: self.seed.clone(),
323            rank_out: self.rank_out,
324            data: self.data.to_ref(),
325        }
326    }
327}