poulpy_core/layouts/compressed/
lwe_ct.rs

1use std::fmt;
2
3use poulpy_hal::{
4    api::ZnFillUniform,
5    layouts::{Backend, Data, DataMut, DataRef, FillUniform, Module, ReaderFrom, WriterTo, Zn, ZnxInfos, ZnxView, ZnxViewMut},
6    source::Source,
7};
8
9use crate::layouts::{Base2K, Degree, LWECiphertext, LWEInfos, TorusPrecision, compressed::Decompress};
10
11#[derive(PartialEq, Eq, Clone)]
12pub struct LWECiphertextCompressed<D: Data> {
13    pub(crate) data: Zn<D>,
14    pub(crate) k: TorusPrecision,
15    pub(crate) base2k: Base2K,
16    pub(crate) seed: [u8; 32],
17}
18
19impl<D: Data> LWEInfos for LWECiphertextCompressed<D> {
20    fn base2k(&self) -> Base2K {
21        self.base2k
22    }
23
24    fn k(&self) -> TorusPrecision {
25        self.k
26    }
27
28    fn n(&self) -> Degree {
29        Degree(self.data.n() as u32)
30    }
31
32    fn size(&self) -> usize {
33        self.data.size()
34    }
35}
36
37impl<D: DataRef> fmt::Debug for LWECiphertextCompressed<D> {
38    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
39        write!(f, "{self}")
40    }
41}
42
43impl<D: DataRef> fmt::Display for LWECiphertextCompressed<D> {
44    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
45        write!(
46            f,
47            "LWECiphertextCompressed: base2k={} k={} seed={:?}: {}",
48            self.base2k(),
49            self.k(),
50            self.seed,
51            self.data
52        )
53    }
54}
55
56impl<D: DataMut> FillUniform for LWECiphertextCompressed<D> {
57    fn fill_uniform(&mut self, log_bound: usize, source: &mut Source) {
58        self.data.fill_uniform(log_bound, source);
59    }
60}
61
62impl LWECiphertextCompressed<Vec<u8>> {
63    pub fn alloc<A>(infos: &A) -> Self
64    where
65        A: LWEInfos,
66    {
67        Self::alloc_with(infos.base2k(), infos.k())
68    }
69
70    pub fn alloc_with(base2k: Base2K, k: TorusPrecision) -> Self {
71        Self {
72            data: Zn::alloc(1, 1, k.0.div_ceil(base2k.0) as usize),
73            k,
74            base2k,
75            seed: [0u8; 32],
76        }
77    }
78
79    pub fn alloc_bytes<A>(infos: &A) -> usize
80    where
81        A: LWEInfos,
82    {
83        Self::alloc_bytes_with(infos.base2k(), infos.k())
84    }
85
86    pub fn alloc_bytes_with(base2k: Base2K, k: TorusPrecision) -> usize {
87        Zn::alloc_bytes(1, 1, k.0.div_ceil(base2k.0) as usize)
88    }
89}
90
91use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
92
93impl<D: DataMut> ReaderFrom for LWECiphertextCompressed<D> {
94    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
95        self.k = TorusPrecision(reader.read_u32::<LittleEndian>()?);
96        self.base2k = Base2K(reader.read_u32::<LittleEndian>()?);
97        reader.read_exact(&mut self.seed)?;
98        self.data.read_from(reader)
99    }
100}
101
102impl<D: DataRef> WriterTo for LWECiphertextCompressed<D> {
103    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
104        writer.write_u32::<LittleEndian>(self.k.into())?;
105        writer.write_u32::<LittleEndian>(self.base2k.into())?;
106        writer.write_all(&self.seed)?;
107        self.data.write_to(writer)
108    }
109}
110
111impl<D: DataMut, B: Backend, DR: DataRef> Decompress<B, LWECiphertextCompressed<DR>> for LWECiphertext<D>
112where
113    Module<B>: ZnFillUniform,
114{
115    fn decompress(&mut self, module: &Module<B>, other: &LWECiphertextCompressed<DR>) {
116        debug_assert_eq!(self.size(), other.size());
117        let mut source: Source = Source::new(other.seed);
118        module.zn_fill_uniform(
119            self.n().into(),
120            other.base2k().into(),
121            &mut self.data,
122            0,
123            &mut source,
124        );
125        (0..self.size()).for_each(|i| {
126            self.data.at_mut(0, i)[0] = other.data.at(0, i)[0];
127        });
128    }
129}
poulpy_core/layouts/compressed/lwe_ct.rs

poulpy_core/layouts/compressed/
lwe_ct.rs
