poulpy_core/layouts/compressed/
glwe_ct.rs

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

poulpy_core/layouts/compressed/
glwe_ct.rs
