poulpy_core/layouts/
lwe_switching_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 LWESwitchingKeyLayout {
19    pub n: Degree,
20    pub base2k: Base2K,
21    pub k: TorusPrecision,
22    pub dnum: Dnum,
23}
24
25impl DeclaredK for LWESwitchingKeyLayout {
26    fn k(&self) -> TorusPrecision {
27        self.k
28    }
29}
30
31impl LWEInfos for LWESwitchingKeyLayout {
32    fn n(&self) -> Degree {
33        self.n
34    }
35
36    fn base2k(&self) -> Base2K {
37        self.base2k
38    }
39
40    fn size(&self) -> usize {
41        self.k.as_usize().div_ceil(self.base2k.as_usize())
42    }
43}
44
45impl GLWEInfos for LWESwitchingKeyLayout {
46    fn rank(&self) -> Rank {
47        self.rank_out()
48    }
49}
50
51impl GGLWEInfos for LWESwitchingKeyLayout {
52    fn rank_in(&self) -> Rank {
53        Rank(1)
54    }
55
56    fn dsize(&self) -> Dsize {
57        Dsize(1)
58    }
59
60    fn rank_out(&self) -> Rank {
61        Rank(1)
62    }
63
64    fn dnum(&self) -> Dnum {
65        self.dnum
66    }
67}
68
69#[derive(PartialEq, Eq, Clone)]
70pub struct LWESwitchingKey<D: Data>(pub(crate) GLWESwitchingKey<D>);
71
72impl<D: Data> LWEInfos for LWESwitchingKey<D> {
73    fn base2k(&self) -> Base2K {
74        self.0.base2k()
75    }
76
77    fn n(&self) -> Degree {
78        self.0.n()
79    }
80
81    fn size(&self) -> usize {
82        self.0.size()
83    }
84}
85
86impl<D: Data> GLWEInfos for LWESwitchingKey<D> {
87    fn rank(&self) -> Rank {
88        self.rank_out()
89    }
90}
91
92impl<D: Data> GGLWEInfos for LWESwitchingKey<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
110#[expect(
111    dead_code,
112    reason = "host-owned constructors are kept for serialization and host-only staging"
113)]
114impl LWESwitchingKey<Vec<u8>> {
115    pub(crate) fn alloc_from_infos<A>(infos: &A) -> Self
116    where
117        A: GGLWEInfos,
118    {
119        assert_eq!(infos.dsize().0, 1, "dsize > 1 is not supported for LWESwitchingKey");
120        assert_eq!(infos.rank_in().0, 1, "rank_in > 1 is not supported for LWESwitchingKey");
121        assert_eq!(infos.rank_out().0, 1, "rank_out > 1 is not supported for LWESwitchingKey");
122        Self::alloc(infos.n(), infos.base2k(), infos.max_k(), infos.dnum())
123    }
124
125    pub(crate) fn alloc(n: Degree, base2k: Base2K, k: TorusPrecision, dnum: Dnum) -> Self {
126        LWESwitchingKey(GLWESwitchingKey::alloc(n, base2k, k, Rank(1), Rank(1), dnum, Dsize(1)))
127    }
128
129    pub fn bytes_of_from_infos<A>(infos: &A) -> usize
130    where
131        A: GGLWEInfos,
132    {
133        assert_eq!(infos.dsize().0, 1, "dsize > 1 is not supported for LWESwitchingKey");
134        assert_eq!(infos.rank_in().0, 1, "rank_in > 1 is not supported for LWESwitchingKey");
135        assert_eq!(infos.rank_out().0, 1, "rank_out > 1 is not supported for LWESwitchingKey");
136        Self::bytes_of(infos.n(), infos.base2k(), infos.max_k(), infos.dnum())
137    }
138
139    pub fn bytes_of(n: Degree, base2k: Base2K, k: TorusPrecision, dnum: Dnum) -> usize {
140        GLWESwitchingKey::bytes_of(n, base2k, k, Rank(1), Rank(1), dnum, Dsize(1))
141    }
142}
143
144impl<D: HostDataRef> fmt::Debug for LWESwitchingKey<D> {
145    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
146        write!(f, "{self}")
147    }
148}
149
150impl<D: HostDataMut> FillUniform for LWESwitchingKey<D> {
151    fn fill_uniform(&mut self, log_bound: usize, source: &mut Source) {
152        self.0.fill_uniform(log_bound, source);
153    }
154}
155
156impl<D: HostDataRef> fmt::Display for LWESwitchingKey<D> {
157    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
158        write!(f, "(LWESwitchingKey) {}", self.0)
159    }
160}
161
162impl<D: HostDataMut> ReaderFrom for LWESwitchingKey<D> {
163    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
164        self.0.read_from(reader)
165    }
166}
167
168impl<D: HostDataRef> WriterTo for LWESwitchingKey<D> {
169    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
170        self.0.write_to(writer)
171    }
172}
173
174impl_gglwe_to_backend_for_field!(LWESwitchingKey<D>, 0, GLWESwitchingKey<D>);
175
176impl_gglwe_at_view_for_field!(LWESwitchingKey<BE::OwnedBuf>; 0.key);
177
178impl<D: HostDataMut> GLWESwitchingKeyDegreesMut for LWESwitchingKey<D> {
179    fn input_degree(&mut self) -> &mut Degree {
180        &mut self.0.input_degree
181    }
182
183    fn output_degree(&mut self) -> &mut Degree {
184        &mut self.0.output_degree
185    }
186}
187
188impl<D: HostDataRef> GLWESwitchingKeyDegrees for LWESwitchingKey<D> {
189    fn input_degree(&self) -> &Degree {
190        &self.0.input_degree
191    }
192
193    fn output_degree(&self) -> &Degree {
194        &self.0.output_degree
195    }
196}
poulpy_core/layouts/lwe_switching_key.rs

poulpy_core/layouts/
lwe_switching_key.rs
