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