poulpy_core/layouts/
lwe_to_glwe_key.rs

1use std::fmt;
2
3use poulpy_hal::{
4    layouts::{Backend, Data, FillUniform, HostDataMut, HostDataRef, ReaderFrom, WriterTo},
5    source::Source,
6};
7
8use crate::{
9    DeclaredK,
10    layouts::{
11        Base2K, Degree, Dnum, Dsize, GGLWEAtViewMut, GGLWEAtViewRef, GGLWEBackendMut, GGLWEBackendRef, GGLWEInfos,
12        GGLWEToBackendMut, GGLWEToBackendRef, GLWEInfos, GLWESwitchingKey, GLWESwitchingKeyDegrees, GLWESwitchingKeyDegreesMut,
13        GLWEViewMut, GLWEViewRef, LWEInfos, Rank, TorusPrecision,
14    },
15};
16
17#[derive(PartialEq, Eq, Copy, Clone, Debug)]
18pub struct LWEToGLWEKeyLayout {
19    pub n: Degree,
20    pub base2k: Base2K,
21    pub k: TorusPrecision,
22    pub rank_out: Rank,
23    pub dnum: Dnum,
24}
25
26impl DeclaredK for LWEToGLWEKeyLayout {
27    fn k(&self) -> TorusPrecision {
28        self.k
29    }
30}
31
32impl LWEInfos for LWEToGLWEKeyLayout {
33    fn base2k(&self) -> Base2K {
34        self.base2k
35    }
36
37    fn n(&self) -> Degree {
38        self.n
39    }
40
41    fn size(&self) -> usize {
42        self.k.as_usize().div_ceil(self.base2k.as_usize())
43    }
44}
45
46impl GLWEInfos for LWEToGLWEKeyLayout {
47    fn rank(&self) -> Rank {
48        self.rank_out()
49    }
50}
51
52impl GGLWEInfos for LWEToGLWEKeyLayout {
53    fn rank_in(&self) -> Rank {
54        Rank(1)
55    }
56
57    fn dsize(&self) -> Dsize {
58        Dsize(1)
59    }
60
61    fn rank_out(&self) -> Rank {
62        self.rank_out
63    }
64
65    fn dnum(&self) -> Dnum {
66        self.dnum
67    }
68}
69
70#[derive(PartialEq, Eq, Clone)]
71pub struct LWEToGLWEKey<D: Data>(pub(crate) GLWESwitchingKey<D>);
72
73impl<D: Data> LWEInfos for LWEToGLWEKey<D> {
74    fn base2k(&self) -> Base2K {
75        self.0.base2k()
76    }
77
78    fn n(&self) -> Degree {
79        self.0.n()
80    }
81
82    fn size(&self) -> usize {
83        self.0.size()
84    }
85}
86
87impl<D: Data> GLWEInfos for LWEToGLWEKey<D> {
88    fn rank(&self) -> Rank {
89        self.rank_out()
90    }
91}
92impl<D: Data> GGLWEInfos for LWEToGLWEKey<D> {
93    fn dsize(&self) -> Dsize {
94        self.0.dsize()
95    }
96
97    fn rank_in(&self) -> Rank {
98        self.0.rank_in()
99    }
100
101    fn rank_out(&self) -> Rank {
102        self.0.rank_out()
103    }
104
105    fn dnum(&self) -> Dnum {
106        self.0.dnum()
107    }
108}
109
110impl<D: HostDataRef> fmt::Debug for LWEToGLWEKey<D> {
111    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
112        write!(f, "{self}")
113    }
114}
115
116impl<D: HostDataMut> FillUniform for LWEToGLWEKey<D> {
117    fn fill_uniform(&mut self, log_bound: usize, source: &mut Source) {
118        self.0.fill_uniform(log_bound, source);
119    }
120}
121
122impl<D: HostDataRef> fmt::Display for LWEToGLWEKey<D> {
123    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
124        write!(f, "(LWEToGLWEKey) {}", self.0)
125    }
126}
127
128impl<D: HostDataMut> ReaderFrom for LWEToGLWEKey<D> {
129    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
130        self.0.read_from(reader)
131    }
132}
133
134impl<D: HostDataRef> WriterTo for LWEToGLWEKey<D> {
135    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
136        self.0.write_to(writer)
137    }
138}
139
140#[expect(
141    dead_code,
142    reason = "host-owned constructors are kept for serialization and host-only staging"
143)]
144impl LWEToGLWEKey<Vec<u8>> {
145    pub(crate) fn alloc_from_infos<A>(infos: &A) -> Self
146    where
147        A: GGLWEInfos,
148    {
149        assert_eq!(infos.rank_in().0, 1, "rank_in > 1 is not supported for LWEToGLWEKey");
150        assert_eq!(infos.dsize().0, 1, "dsize > 1 is not supported for LWEToGLWEKey");
151
152        Self::alloc(infos.n(), infos.base2k(), infos.max_k(), infos.rank_out(), infos.dnum())
153    }
154
155    pub(crate) fn alloc(n: Degree, base2k: Base2K, k: TorusPrecision, rank_out: Rank, dnum: Dnum) -> Self {
156        LWEToGLWEKey(GLWESwitchingKey::alloc(n, base2k, k, Rank(1), rank_out, dnum, Dsize(1)))
157    }
158
159    pub fn bytes_of_from_infos<A>(infos: &A) -> usize
160    where
161        A: GGLWEInfos,
162    {
163        assert_eq!(infos.rank_in().0, 1, "rank_in > 1 is not supported for LWEToGLWEKey");
164        assert_eq!(infos.dsize().0, 1, "dsize > 1 is not supported for LWEToGLWEKey");
165        Self::bytes_of(infos.n(), infos.base2k(), infos.max_k(), infos.rank_out(), infos.dnum())
166    }
167
168    pub fn bytes_of(n: Degree, base2k: Base2K, k: TorusPrecision, rank_out: Rank, dnum: Dnum) -> usize {
169        GLWESwitchingKey::bytes_of(n, base2k, k, Rank(1), rank_out, dnum, Dsize(1))
170    }
171}
172
173impl_gglwe_to_backend_for_field!(LWEToGLWEKey<D>, 0, GLWESwitchingKey<D>);
174
175impl_gglwe_at_view_for_field!(LWEToGLWEKey<BE::OwnedBuf>; 0.key);
176
177impl<D: HostDataMut> GLWESwitchingKeyDegreesMut for LWEToGLWEKey<D> {
178    fn input_degree(&mut self) -> &mut Degree {
179        &mut self.0.input_degree
180    }
181
182    fn output_degree(&mut self) -> &mut Degree {
183        &mut self.0.output_degree
184    }
185}
186
187impl<D: HostDataRef> GLWESwitchingKeyDegrees for LWEToGLWEKey<D> {
188    fn input_degree(&self) -> &Degree {
189        &self.0.input_degree
190    }
191
192    fn output_degree(&self) -> &Degree {
193        &self.0.output_degree
194    }
195}
poulpy_core/layouts/lwe_to_glwe_key.rs

poulpy_core/layouts/
lwe_to_glwe_key.rs
