1use poulpy_hal::{
  2    layouts::{Backend, Data, DataMut, DataRef, FillUniform, Module, ReaderFrom, WriterTo},
  3    source::Source,
  4};
  5
  6use crate::layouts::{
  7    AutomorphismKey, AutomorphismKeyToMut, Base2K, Degree, Dnum, Dsize, GGLWEInfos, GLWEInfos, LWEInfos, Rank, TorusPrecision,
  8    compressed::{
  9        GLWESwitchingKeyCompressed, GLWESwitchingKeyCompressedAlloc, GLWESwitchingKeyCompressedToMut,
 10        GLWESwitchingKeyCompressedToRef, GLWESwitchingKeyDecompress,
 11    },
 12    prepared::{GetAutomorphismGaloisElement, SetAutomorphismGaloisElement},
 13};
 14use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
 15use std::fmt;
 16
 17#[derive(PartialEq, Eq, Clone)]
 18pub struct AutomorphismKeyCompressed<D: Data> {
 19    pub(crate) key: GLWESwitchingKeyCompressed<D>,
 20    pub(crate) p: i64,
 21}
 22
 23impl<D: Data> LWEInfos for AutomorphismKeyCompressed<D> {
 24    fn n(&self) -> Degree {
 25        self.key.n()
 26    }
 27
 28    fn base2k(&self) -> Base2K {
 29        self.key.base2k()
 30    }
 31
 32    fn k(&self) -> TorusPrecision {
 33        self.key.k()
 34    }
 35
 36    fn size(&self) -> usize {
 37        self.key.size()
 38    }
 39}
 40impl<D: Data> GLWEInfos for AutomorphismKeyCompressed<D> {
 41    fn rank(&self) -> Rank {
 42        self.rank_out()
 43    }
 44}
 45
 46impl<D: Data> GGLWEInfos for AutomorphismKeyCompressed<D> {
 47    fn rank_in(&self) -> Rank {
 48        self.key.rank_in()
 49    }
 50
 51    fn rank_out(&self) -> Rank {
 52        self.key.rank_out()
 53    }
 54
 55    fn dsize(&self) -> Dsize {
 56        self.key.dsize()
 57    }
 58
 59    fn dnum(&self) -> Dnum {
 60        self.key.dnum()
 61    }
 62}
 63
 64impl<D: DataRef> fmt::Debug for AutomorphismKeyCompressed<D> {
 65    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 66        write!(f, "{self}")
 67    }
 68}
 69
 70impl<D: DataMut> FillUniform for AutomorphismKeyCompressed<D> {
 71    fn fill_uniform(&mut self, log_bound: usize, source: &mut Source) {
 72        self.key.fill_uniform(log_bound, source);
 73    }
 74}
 75
 76impl<D: DataRef> fmt::Display for AutomorphismKeyCompressed<D> {
 77    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 78        write!(f, "(AutomorphismKeyCompressed: p={}) {}", self.p, self.key)
 79    }
 80}
 81
 82impl<BE: Backend> AutomorphismKeyCompressedAlloc for Module<BE> where Self: GLWESwitchingKeyCompressedAlloc {}
 83
 84pub trait AutomorphismKeyCompressedAlloc
 85where
 86    Self: GLWESwitchingKeyCompressedAlloc,
 87{
 88    fn alloc_automorphism_key_compressed(
 89        &self,
 90        base2k: Base2K,
 91        k: TorusPrecision,
 92        rank: Rank,
 93        dnum: Dnum,
 94        dsize: Dsize,
 95    ) -> AutomorphismKeyCompressed<Vec<u8>> {
 96        AutomorphismKeyCompressed {
 97            key: self.alloc_glwe_switching_key_compressed(base2k, k, rank, rank, dnum, dsize),
 98            p: 0,
 99        }
100    }
101
102    fn alloc_automorphism_key_compressed_from_infos<A>(&self, infos: &A) -> AutomorphismKeyCompressed<Vec<u8>>
103    where
104        A: GGLWEInfos,
105    {
106        assert_eq!(infos.rank_in(), infos.rank_out());
107        self.alloc_automorphism_key_compressed(
108            infos.base2k(),
109            infos.k(),
110            infos.rank(),
111            infos.dnum(),
112            infos.dsize(),
113        )
114    }
115
116    fn bytes_of_automorphism_key_compressed(
117        &self,
118        base2k: Base2K,
119        k: TorusPrecision,
120        rank: Rank,
121        dnum: Dnum,
122        dsize: Dsize,
123    ) -> usize {
124        self.bytes_of_glwe_switching_key_compressed(base2k, k, rank, dnum, dsize)
125    }
126
127    fn bytes_of_automorphism_key_compressed_from_infos<A>(&self, infos: &A) -> usize
128    where
129        A: GGLWEInfos,
130    {
131        assert_eq!(infos.rank_in(), infos.rank_out());
132        self.bytes_of_automorphism_key_compressed(
133            infos.base2k(),
134            infos.k(),
135            infos.rank(),
136            infos.dnum(),
137            infos.dsize(),
138        )
139    }
140}
141
142impl AutomorphismKeyCompressed<Vec<u8>> {
143    pub fn alloc_from_infos<A, M>(module: &M, infos: &A) -> Self
144    where
145        A: GGLWEInfos,
146        M: AutomorphismKeyCompressedAlloc,
147    {
148        module.alloc_automorphism_key_compressed_from_infos(infos)
149    }
150
151    pub fn alloc<M>(module: &M, base2k: Base2K, k: TorusPrecision, rank: Rank, dnum: Dnum, dsize: Dsize) -> Self
152    where
153        M: AutomorphismKeyCompressedAlloc,
154    {
155        module.alloc_automorphism_key_compressed(base2k, k, rank, dnum, dsize)
156    }
157
158    pub fn bytes_of_from_infos<A, M>(module: &M, infos: &A) -> usize
159    where
160        A: GGLWEInfos,
161        M: AutomorphismKeyCompressedAlloc,
162    {
163        module.bytes_of_automorphism_key_compressed_from_infos(infos)
164    }
165
166    pub fn bytes_of<M>(module: &M, base2k: Base2K, k: TorusPrecision, rank: Rank, dnum: Dnum, dsize: Dsize) -> usize
167    where
168        M: AutomorphismKeyCompressedAlloc,
169    {
170        module.bytes_of_automorphism_key_compressed(base2k, k, rank, dnum, dsize)
171    }
172}
173
174impl<D: DataMut> ReaderFrom for AutomorphismKeyCompressed<D> {
175    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
176        self.p = reader.read_u64::<LittleEndian>()? as i64;
177        self.key.read_from(reader)
178    }
179}
180
181impl<D: DataRef> WriterTo for AutomorphismKeyCompressed<D> {
182    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
183        writer.write_u64::<LittleEndian>(self.p as u64)?;
184        self.key.write_to(writer)
185    }
186}
187
188pub trait AutomorphismKeyDecompress
189where
190    Self: GLWESwitchingKeyDecompress,
191{
192    fn decompress_automorphism_key<R, O>(&self, res: &mut R, other: &O)
193    where
194        R: AutomorphismKeyToMut + SetAutomorphismGaloisElement,
195        O: AutomorphismKeyCompressedToRef + GetAutomorphismGaloisElement,
196    {
197        self.decompress_glwe_switching_key(&mut res.to_mut().key, &other.to_ref().key);
198        res.set_p(other.p());
199    }
200}
201
202impl<B: Backend> AutomorphismKeyDecompress for Module<B> where Self: AutomorphismKeyDecompress {}
203
204impl<D: DataMut> AutomorphismKey<D>
205where
206    Self: SetAutomorphismGaloisElement,
207{
208    pub fn decompress<O, M>(&mut self, module: &M, other: &O)
209    where
210        O: AutomorphismKeyCompressedToRef + GetAutomorphismGaloisElement,
211        M: AutomorphismKeyDecompress,
212    {
213        module.decompress_automorphism_key(self, other);
214    }
215}
216
217pub trait AutomorphismKeyCompressedToRef {
218    fn to_ref(&self) -> AutomorphismKeyCompressed<&[u8]>;
219}
220
221impl<D: DataRef> AutomorphismKeyCompressedToRef for AutomorphismKeyCompressed<D>
222where
223    GLWESwitchingKeyCompressed<D>: GLWESwitchingKeyCompressedToRef,
224{
225    fn to_ref(&self) -> AutomorphismKeyCompressed<&[u8]> {
226        AutomorphismKeyCompressed {
227            key: self.key.to_ref(),
228            p: self.p,
229        }
230    }
231}
232
233pub trait AutomorphismKeyCompressedToMut {
234    fn to_mut(&mut self) -> AutomorphismKeyCompressed<&mut [u8]>;
235}
236
237impl<D: DataMut> AutomorphismKeyCompressedToMut for AutomorphismKeyCompressed<D>
238where
239    GLWESwitchingKeyCompressed<D>: GLWESwitchingKeyCompressedToMut,
240{
241    fn to_mut(&mut self) -> AutomorphismKeyCompressed<&mut [u8]> {
242        AutomorphismKeyCompressed {
243            p: self.p,
244            key: self.key.to_mut(),
245        }
246    }
247}