1use poulpy_hal::{
  2    layouts::{Data, DataMut, DataRef, FillUniform, ReaderFrom, WriterTo},
  3    source::Source,
  4};
  5
  6use crate::layouts::{
  7    Base2K, Degree, Dnum, Dsize, GGLWE, GGLWEInfos, GGLWEToMut, GGLWEToRef, GLWEInfos, GLWESwitchingKey, GLWESwitchingKeyDegrees,
  8    GLWESwitchingKeyDegreesMut, LWEInfos, 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 [GLWE] to [LWE].
 61#[derive(PartialEq, Eq, Clone)]
 62pub struct GLWEToLWEKey<D: Data>(pub(crate) GLWESwitchingKey<D>);
 63
 64impl<D: Data> LWEInfos for GLWEToLWEKey<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 GLWEToLWEKey<D> {
 83    fn rank(&self) -> Rank {
 84        self.rank_out()
 85    }
 86}
 87impl<D: Data> GGLWEInfos for GLWEToLWEKey<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 GLWEToLWEKey<D> {
106    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
107        write!(f, "{self}")
108    }
109}
110
111impl<D: DataMut> FillUniform for GLWEToLWEKey<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 GLWEToLWEKey<D> {
118    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
119        write!(f, "(GLWEToLWEKey) {}", self.0)
120    }
121}
122
123impl<D: DataMut> ReaderFrom for GLWEToLWEKey<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 GLWEToLWEKey<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 GLWEToLWEKey<Vec<u8>> {
136    pub fn alloc_from_infos<A>(infos: &A) -> Self
137    where
138        A: GGLWEInfos,
139    {
140        assert_eq!(infos.rank_out().0, 1, "rank_out > 1 is not supported for GLWEToLWEKey");
141        assert_eq!(infos.dsize().0, 1, "dsize > 1 is not supported for GLWEToLWEKey");
142        Self::alloc(infos.n(), infos.base2k(), infos.k(), infos.rank_in(), infos.dnum())
143    }
144
145    pub fn alloc(n: Degree, base2k: Base2K, k: TorusPrecision, rank_in: Rank, dnum: Dnum) -> Self {
146        GLWEToLWEKey(GLWESwitchingKey::alloc(n, base2k, k, rank_in, Rank(1), dnum, Dsize(1)))
147    }
148
149    pub fn bytes_of_from_infos<A>(infos: &A) -> usize
150    where
151        A: GGLWEInfos,
152    {
153        assert_eq!(infos.rank_out().0, 1, "rank_out > 1 is not supported for GLWEToLWEKey");
154        assert_eq!(infos.dsize().0, 1, "dsize > 1 is not supported for GLWEToLWEKey");
155        Self::bytes_of(infos.n(), infos.base2k(), infos.k(), infos.rank_in(), infos.dnum())
156    }
157
158    pub fn bytes_of(n: Degree, base2k: Base2K, k: TorusPrecision, rank_in: Rank, dnum: Dnum) -> usize {
159        GLWESwitchingKey::bytes_of(n, base2k, k, rank_in, Rank(1), dnum, Dsize(1))
160    }
161}
162
163impl<D: DataRef> GGLWEToRef for GLWEToLWEKey<D> {
164    fn to_ref(&self) -> GGLWE<&[u8]> {
165        self.0.to_ref()
166    }
167}
168
169impl<D: DataMut> GGLWEToMut for GLWEToLWEKey<D> {
170    fn to_mut(&mut self) -> GGLWE<&mut [u8]> {
171        self.0.to_mut()
172    }
173}
174
175impl<D: DataMut> GLWESwitchingKeyDegreesMut for GLWEToLWEKey<D> {
176    fn input_degree(&mut self) -> &mut Degree {
177        &mut self.0.input_degree
178    }
179
180    fn output_degree(&mut self) -> &mut Degree {
181        &mut self.0.output_degree
182    }
183}
184
185impl<D: DataRef> GLWESwitchingKeyDegrees for GLWEToLWEKey<D> {
186    fn input_degree(&self) -> &Degree {
187        &self.0.input_degree
188    }
189
190    fn output_degree(&self) -> &Degree {
191        &self.0.output_degree
192    }
193}