1use poulpy_hal::{
  2    layouts::{Data, DataMut, DataRef, FillUniform, MatZnx, ReaderFrom, Reset, WriterTo},
  3    source::Source,
  4};
  5use std::fmt;
  6
  7use crate::layouts::{GLWECiphertext, Infos};
  8
  9#[derive(PartialEq, Eq, Clone)]
 10pub struct GGSWCiphertext<D: Data> {
 11    pub(crate) data: MatZnx<D>,
 12    pub(crate) basek: usize,
 13    pub(crate) k: usize,
 14    pub(crate) digits: usize,
 15}
 16
 17impl<D: DataRef> fmt::Debug for GGSWCiphertext<D> {
 18    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 19        write!(f, "{}", self.data)
 20    }
 21}
 22
 23impl<D: DataRef> fmt::Display for GGSWCiphertext<D> {
 24    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 25        write!(
 26            f,
 27            "(GGSWCiphertext: basek={} k={} digits={}) {}",
 28            self.basek, self.k, self.digits, self.data
 29        )
 30    }
 31}
 32
 33impl<D: DataMut> Reset for GGSWCiphertext<D> {
 34    fn reset(&mut self) {
 35        self.data.reset();
 36        self.basek = 0;
 37        self.k = 0;
 38        self.digits = 0;
 39    }
 40}
 41
 42impl<D: DataMut> FillUniform for GGSWCiphertext<D> {
 43    fn fill_uniform(&mut self, source: &mut Source) {
 44        self.data.fill_uniform(source);
 45    }
 46}
 47
 48impl<D: DataRef> GGSWCiphertext<D> {
 49    pub fn at(&self, row: usize, col: usize) -> GLWECiphertext<&[u8]> {
 50        GLWECiphertext {
 51            data: self.data.at(row, col),
 52            basek: self.basek,
 53            k: self.k,
 54        }
 55    }
 56}
 57
 58impl<D: DataMut> GGSWCiphertext<D> {
 59    pub fn at_mut(&mut self, row: usize, col: usize) -> GLWECiphertext<&mut [u8]> {
 60        GLWECiphertext {
 61            data: self.data.at_mut(row, col),
 62            basek: self.basek,
 63            k: self.k,
 64        }
 65    }
 66}
 67
 68impl GGSWCiphertext<Vec<u8>> {
 69    pub fn alloc(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> Self {
 70        let size: usize = k.div_ceil(basek);
 71        debug_assert!(digits > 0, "invalid ggsw: `digits` == 0");
 72
 73        debug_assert!(
 74            size > digits,
 75            "invalid ggsw: ceil(k/basek): {} <= digits: {}",
 76            size,
 77            digits
 78        );
 79
 80        assert!(
 81            rows * digits <= size,
 82            "invalid ggsw: rows: {} * digits:{} > ceil(k/basek): {}",
 83            rows,
 84            digits,
 85            size
 86        );
 87
 88        Self {
 89            data: MatZnx::alloc(n, rows, rank + 1, rank + 1, k.div_ceil(basek)),
 90            basek,
 91            k,
 92            digits,
 93        }
 94    }
 95
 96    pub fn bytes_of(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> usize {
 97        let size: usize = k.div_ceil(basek);
 98        debug_assert!(
 99            size > digits,
100            "invalid ggsw: ceil(k/basek): {} <= digits: {}",
101            size,
102            digits
103        );
104
105        assert!(
106            rows * digits <= size,
107            "invalid ggsw: rows: {} * digits:{} > ceil(k/basek): {}",
108            rows,
109            digits,
110            size
111        );
112
113        MatZnx::alloc_bytes(n, rows, rank + 1, rank + 1, size)
114    }
115}
116
117impl<D: Data> Infos for GGSWCiphertext<D> {
118    type Inner = MatZnx<D>;
119
120    fn inner(&self) -> &Self::Inner {
121        &self.data
122    }
123
124    fn basek(&self) -> usize {
125        self.basek
126    }
127
128    fn k(&self) -> usize {
129        self.k
130    }
131}
132
133impl<D: Data> GGSWCiphertext<D> {
134    pub fn rank(&self) -> usize {
135        self.data.cols_out() - 1
136    }
137
138    pub fn digits(&self) -> usize {
139        self.digits
140    }
141}
142
143use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
144
145impl<D: DataMut> ReaderFrom for GGSWCiphertext<D> {
146    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
147        self.k = reader.read_u64::<LittleEndian>()? as usize;
148        self.basek = reader.read_u64::<LittleEndian>()? as usize;
149        self.digits = reader.read_u64::<LittleEndian>()? as usize;
150        self.data.read_from(reader)
151    }
152}
153
154impl<D: DataRef> WriterTo for GGSWCiphertext<D> {
155    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
156        writer.write_u64::<LittleEndian>(self.k as u64)?;
157        writer.write_u64::<LittleEndian>(self.basek as u64)?;
158        writer.write_u64::<LittleEndian>(self.digits as u64)?;
159        self.data.write_to(writer)
160    }
161}