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