1use poulpy_hal::{
  2    layouts::{Data, DataMut, DataRef, FillUniform, ReaderFrom, WriterTo},
  3    source::Source,
  4};
  5
  6use crate::layouts::{
  7    Base2K, Degree, Dnum, Dsize, GGLWEInfos, GLWEInfos, GLWESwitchingKey, GLWESwitchingKeyToMut, GLWESwitchingKeyToRef, LWEInfos,
  8    Rank, TorusPrecision,
  9};
 10
 11use std::fmt;
 12
 13#[derive(PartialEq, Eq, Copy, Clone, Debug)]
 14pub struct GLWEToLWEKeyLayout {
 15    pub n: Degree,
 16    pub base2k: Base2K,
 17    pub k: TorusPrecision,
 18    pub rank_in: Rank,
 19    pub dnum: Dnum,
 20}
 21
 22impl LWEInfos for GLWEToLWEKeyLayout {
 23    fn n(&self) -> Degree {
 24        self.n
 25    }
 26
 27    fn base2k(&self) -> Base2K {
 28        self.base2k
 29    }
 30
 31    fn k(&self) -> TorusPrecision {
 32        self.k
 33    }
 34}
 35
 36impl GLWEInfos for GLWEToLWEKeyLayout {
 37    fn rank(&self) -> Rank {
 38        self.rank_out()
 39    }
 40}
 41
 42impl GGLWEInfos for GLWEToLWEKeyLayout {
 43    fn rank_in(&self) -> Rank {
 44        self.rank_in
 45    }
 46
 47    fn dsize(&self) -> Dsize {
 48        Dsize(1)
 49    }
 50
 51    fn rank_out(&self) -> Rank {
 52        Rank(1)
 53    }
 54
 55    fn dnum(&self) -> Dnum {
 56        self.dnum
 57    }
 58}
 59
 60/// A special [GLWESwitchingKey] required to for the conversion from [GLWECiphertext] to [LWECiphertext].
 61#[derive(PartialEq, Eq, Clone)]
 62pub struct GLWEToLWESwitchingKey<D: Data>(pub(crate) GLWESwitchingKey<D>);
 63
 64impl<D: Data> LWEInfos for GLWEToLWESwitchingKey<D> {
 65    fn base2k(&self) -> Base2K {
 66        self.0.base2k()
 67    }
 68
 69    fn k(&self) -> TorusPrecision {
 70        self.0.k()
 71    }
 72
 73    fn n(&self) -> Degree {
 74        self.0.n()
 75    }
 76
 77    fn size(&self) -> usize {
 78        self.0.size()
 79    }
 80}
 81
 82impl<D: Data> GLWEInfos for GLWEToLWESwitchingKey<D> {
 83    fn rank(&self) -> Rank {
 84        self.rank_out()
 85    }
 86}
 87impl<D: Data> GGLWEInfos for GLWEToLWESwitchingKey<D> {
 88    fn rank_in(&self) -> Rank {
 89        self.0.rank_in()
 90    }
 91
 92    fn dsize(&self) -> Dsize {
 93        self.0.dsize()
 94    }
 95
 96    fn rank_out(&self) -> Rank {
 97        self.0.rank_out()
 98    }
 99
100    fn dnum(&self) -> Dnum {
101        self.0.dnum()
102    }
103}
104
105impl<D: DataRef> fmt::Debug for GLWEToLWESwitchingKey<D> {
106    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
107        write!(f, "{self}")
108    }
109}
110
111impl<D: DataMut> FillUniform for GLWEToLWESwitchingKey<D> {
112    fn fill_uniform(&mut self, log_bound: usize, source: &mut Source) {
113        self.0.fill_uniform(log_bound, source);
114    }
115}
116
117impl<D: DataRef> fmt::Display for GLWEToLWESwitchingKey<D> {
118    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
119        write!(f, "(GLWEToLWESwitchingKey) {}", self.0)
120    }
121}
122
123impl<D: DataMut> ReaderFrom for GLWEToLWESwitchingKey<D> {
124    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
125        self.0.read_from(reader)
126    }
127}
128
129impl<D: DataRef> WriterTo for GLWEToLWESwitchingKey<D> {
130    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
131        self.0.write_to(writer)
132    }
133}
134
135impl GLWEToLWESwitchingKey<Vec<u8>> {
136    pub fn alloc<A>(infos: &A) -> Self
137    where
138        A: GGLWEInfos,
139    {
140        debug_assert_eq!(
141            infos.rank_out().0,
142            1,
143            "rank_out > 1 is not supported for GLWEToLWESwitchingKey"
144        );
145        debug_assert_eq!(
146            infos.dsize().0,
147            1,
148            "dsize > 1 is not supported for GLWEToLWESwitchingKey"
149        );
150        Self(GLWESwitchingKey::alloc(infos))
151    }
152
153    pub fn alloc_with(n: Degree, base2k: Base2K, k: TorusPrecision, rank_in: Rank, dnum: Dnum) -> Self {
154        Self(GLWESwitchingKey::alloc_with(
155            n,
156            base2k,
157            k,
158            rank_in,
159            Rank(1),
160            dnum,
161            Dsize(1),
162        ))
163    }
164
165    pub fn alloc_bytes<A>(infos: &A) -> usize
166    where
167        A: GGLWEInfos,
168    {
169        debug_assert_eq!(
170            infos.rank_out().0,
171            1,
172            "rank_out > 1 is not supported for GLWEToLWESwitchingKey"
173        );
174        debug_assert_eq!(
175            infos.dsize().0,
176            1,
177            "dsize > 1 is not supported for GLWEToLWESwitchingKey"
178        );
179        GLWESwitchingKey::alloc_bytes(infos)
180    }
181
182    pub fn alloc_bytes_with(n: Degree, base2k: Base2K, k: TorusPrecision, rank_in: Rank, dnum: Dnum) -> usize {
183        GLWESwitchingKey::alloc_bytes_with(n, base2k, k, rank_in, Rank(1), dnum, Dsize(1))
184    }
185}
186
187pub trait GLWEToLWESwitchingKeyToRef {
188    fn to_ref(&self) -> GLWEToLWESwitchingKey<&[u8]>;
189}
190
191impl<D: DataRef> GLWEToLWESwitchingKeyToRef for GLWEToLWESwitchingKey<D>
192where
193    GLWESwitchingKey<D>: GLWESwitchingKeyToRef,
194{
195    fn to_ref(&self) -> GLWEToLWESwitchingKey<&[u8]> {
196        GLWEToLWESwitchingKey(self.0.to_ref())
197    }
198}
199
200pub trait GLWEToLWESwitchingKeyToMut {
201    fn to_mut(&mut self) -> GLWEToLWESwitchingKey<&mut [u8]>;
202}
203
204impl<D: DataMut> GLWEToLWESwitchingKeyToMut for GLWEToLWESwitchingKey<D>
205where
206    GLWESwitchingKey<D>: GLWESwitchingKeyToMut,
207{
208    fn to_mut(&mut self) -> GLWEToLWESwitchingKey<&mut [u8]> {
209        GLWEToLWESwitchingKey(self.0.to_mut())
210    }
211}