poulpy_core/layouts/compressed/
lwe.rs

1use std::fmt;
2
3use poulpy_hal::{
4    api::ZnFillUniform,
5    layouts::{
6        Backend, Data, DataMut, DataRef, FillUniform, Module, ReaderFrom, WriterTo, Zn, ZnToMut, ZnToRef, ZnxInfos, ZnxView,
7        ZnxViewMut,
8    },
9    source::Source,
10};
11
12use crate::layouts::{Base2K, Degree, LWE, LWEInfos, LWEToMut, TorusPrecision};
13
14#[derive(PartialEq, Eq, Clone)]
15pub struct LWECompressed<D: Data> {
16    pub(crate) data: Zn<D>,
17    pub(crate) k: TorusPrecision,
18    pub(crate) base2k: Base2K,
19    pub(crate) seed: [u8; 32],
20}
21
22impl<D: Data> LWEInfos for LWECompressed<D> {
23    fn base2k(&self) -> Base2K {
24        self.base2k
25    }
26
27    fn k(&self) -> TorusPrecision {
28        self.k
29    }
30
31    fn n(&self) -> Degree {
32        Degree(self.data.n() as u32)
33    }
34
35    fn size(&self) -> usize {
36        self.data.size()
37    }
38}
39
40impl<D: DataRef> fmt::Debug for LWECompressed<D> {
41    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
42        write!(f, "{self}")
43    }
44}
45
46impl<D: DataRef> fmt::Display for LWECompressed<D> {
47    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
48        write!(
49            f,
50            "LWECompressed: base2k={} k={} seed={:?}: {}",
51            self.base2k(),
52            self.k(),
53            self.seed,
54            self.data
55        )
56    }
57}
58
59impl<D: DataMut> FillUniform for LWECompressed<D> {
60    fn fill_uniform(&mut self, log_bound: usize, source: &mut Source) {
61        self.data.fill_uniform(log_bound, source);
62    }
63}
64
65impl LWECompressed<Vec<u8>> {
66    pub fn alloc_from_infos<A>(infos: &A) -> Self
67    where
68        A: LWEInfos,
69    {
70        Self::alloc(infos.base2k(), infos.k())
71    }
72
73    pub fn alloc(base2k: Base2K, k: TorusPrecision) -> Self {
74        LWECompressed {
75            data: Zn::alloc(1, 1, k.0.div_ceil(base2k.0) as usize),
76            k,
77            base2k,
78            seed: [0u8; 32],
79        }
80    }
81
82    pub fn bytes_of_from_infos<A>(infos: &A) -> usize
83    where
84        A: LWEInfos,
85    {
86        Self::bytes_of(infos.base2k(), infos.k())
87    }
88
89    pub fn bytes_of(base2k: Base2K, k: TorusPrecision) -> usize {
90        Zn::bytes_of(1, 1, k.0.div_ceil(base2k.0) as usize)
91    }
92}
93
94use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
95
96impl<D: DataMut> ReaderFrom for LWECompressed<D> {
97    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
98        self.k = TorusPrecision(reader.read_u32::<LittleEndian>()?);
99        self.base2k = Base2K(reader.read_u32::<LittleEndian>()?);
100        reader.read_exact(&mut self.seed)?;
101        self.data.read_from(reader)
102    }
103}
104
105impl<D: DataRef> WriterTo for LWECompressed<D> {
106    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
107        writer.write_u32::<LittleEndian>(self.k.into())?;
108        writer.write_u32::<LittleEndian>(self.base2k.into())?;
109        writer.write_all(&self.seed)?;
110        self.data.write_to(writer)
111    }
112}
113
114pub trait LWEDecompress
115where
116    Self: ZnFillUniform,
117{
118    fn decompress_lwe<R, O>(&self, res: &mut R, other: &O)
119    where
120        R: LWEToMut,
121        O: LWECompressedToRef,
122    {
123        let res: &mut LWE<&mut [u8]> = &mut res.to_mut();
124        let other: &LWECompressed<&[u8]> = &other.to_ref();
125
126        assert_eq!(res.lwe_layout(), other.lwe_layout());
127
128        let mut source: Source = Source::new(other.seed);
129        self.zn_fill_uniform(
130            res.n().into(),
131            other.base2k().into(),
132            &mut res.data,
133            0,
134            &mut source,
135        );
136        for i in 0..res.size() {
137            res.data.at_mut(0, i)[0] = other.data.at(0, i)[0];
138        }
139    }
140}
141
142impl<B: Backend> LWEDecompress for Module<B> where Self: ZnFillUniform {}
143
144impl<D: DataMut> LWE<D> {
145    pub fn decompress<O, M>(&mut self, module: &M, other: &O)
146    where
147        O: LWECompressedToRef,
148        M: LWEDecompress,
149    {
150        module.decompress_lwe(self, other);
151    }
152}
153
154pub trait LWECompressedToRef {
155    fn to_ref(&self) -> LWECompressed<&[u8]>;
156}
157
158impl<D: DataRef> LWECompressedToRef for LWECompressed<D> {
159    fn to_ref(&self) -> LWECompressed<&[u8]> {
160        LWECompressed {
161            k: self.k,
162            base2k: self.base2k,
163            seed: self.seed,
164            data: self.data.to_ref(),
165        }
166    }
167}
168
169pub trait LWECompressedToMut {
170    fn to_mut(&mut self) -> LWECompressed<&mut [u8]>;
171}
172
173impl<D: DataMut> LWECompressedToMut for LWECompressed<D> {
174    fn to_mut(&mut self) -> LWECompressed<&mut [u8]> {
175        LWECompressed {
176            k: self.k,
177            base2k: self.base2k,
178            seed: self.seed,
179            data: self.data.to_mut(),
180        }
181    }
182}
poulpy_core/layouts/compressed/lwe.rs

poulpy_core/layouts/compressed/
lwe.rs
