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