poulpy_core/layouts/compressed/
lwe_ct.rs

1use std::fmt;
2
3use poulpy_hal::{
4    api::ZnFillUniform,
5    layouts::{
6        Backend, Data, DataMut, DataRef, FillUniform, Module, ReaderFrom, Reset, VecZnx, WriterTo, ZnxInfos, ZnxView, ZnxViewMut,
7    },
8    source::Source,
9};
10
11use crate::layouts::{Infos, LWECiphertext, SetMetaData, compressed::Decompress};
12
13#[derive(PartialEq, Eq, Clone)]
14pub struct LWECiphertextCompressed<D: Data> {
15    pub(crate) data: VecZnx<D>,
16    pub(crate) k: usize,
17    pub(crate) basek: usize,
18    pub(crate) seed: [u8; 32],
19}
20
21impl<D: DataRef> fmt::Debug for LWECiphertextCompressed<D> {
22    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
23        write!(f, "{}", self)
24    }
25}
26
27impl<D: DataRef> fmt::Display for LWECiphertextCompressed<D> {
28    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
29        write!(
30            f,
31            "LWECiphertextCompressed: basek={} k={} seed={:?}: {}",
32            self.basek(),
33            self.k(),
34            self.seed,
35            self.data
36        )
37    }
38}
39
40impl<D: DataMut> Reset for LWECiphertextCompressed<D>
41where
42    VecZnx<D>: Reset,
43{
44    fn reset(&mut self) {
45        self.data.reset();
46        self.basek = 0;
47        self.k = 0;
48        self.seed = [0u8; 32];
49    }
50}
51
52impl<D: DataMut> FillUniform for LWECiphertextCompressed<D> {
53    fn fill_uniform(&mut self, log_bound: usize, source: &mut Source) {
54        self.data.fill_uniform(log_bound, source);
55    }
56}
57
58impl LWECiphertextCompressed<Vec<u8>> {
59    pub fn alloc(basek: usize, k: usize) -> Self {
60        Self {
61            data: VecZnx::alloc(1, 1, k.div_ceil(basek)),
62            k,
63            basek,
64            seed: [0u8; 32],
65        }
66    }
67}
68
69impl<D: Data> Infos for LWECiphertextCompressed<D>
70where
71    VecZnx<D>: ZnxInfos,
72{
73    type Inner = VecZnx<D>;
74
75    fn n(&self) -> usize {
76        &self.inner().n() - 1
77    }
78
79    fn inner(&self) -> &Self::Inner {
80        &self.data
81    }
82
83    fn basek(&self) -> usize {
84        self.basek
85    }
86
87    fn k(&self) -> usize {
88        self.k
89    }
90}
91
92impl<DataSelf: DataMut> SetMetaData for LWECiphertextCompressed<DataSelf> {
93    fn set_k(&mut self, k: usize) {
94        self.k = k
95    }
96
97    fn set_basek(&mut self, basek: usize) {
98        self.basek = basek
99    }
100}
101
102use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
103
104impl<D: DataMut> ReaderFrom for LWECiphertextCompressed<D> {
105    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
106        self.k = reader.read_u64::<LittleEndian>()? as usize;
107        self.basek = reader.read_u64::<LittleEndian>()? as usize;
108        reader.read_exact(&mut self.seed)?;
109        self.data.read_from(reader)
110    }
111}
112
113impl<D: DataRef> WriterTo for LWECiphertextCompressed<D> {
114    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
115        writer.write_u64::<LittleEndian>(self.k as u64)?;
116        writer.write_u64::<LittleEndian>(self.basek as u64)?;
117        writer.write_all(&self.seed)?;
118        self.data.write_to(writer)
119    }
120}
121
122impl<D: DataMut, B: Backend, DR: DataRef> Decompress<B, LWECiphertextCompressed<DR>> for LWECiphertext<D>
123where
124    Module<B>: ZnFillUniform,
125{
126    fn decompress(&mut self, module: &Module<B>, other: &LWECiphertextCompressed<DR>) {
127        debug_assert_eq!(self.size(), other.size());
128        let mut source: Source = Source::new(other.seed);
129        module.zn_fill_uniform(self.n(), other.basek(), &mut self.data, 0, &mut source);
130        (0..self.size()).for_each(|i| {
131            self.data.at_mut(0, i)[0] = other.data.at(0, i)[0];
132        });
133    }
134}
poulpy_core/layouts/compressed/lwe_ct.rs

poulpy_core/layouts/compressed/
lwe_ct.rs
