1use backend::{
  2    Backend, FFT64, Module, VecZnx, VecZnxAlloc, VecZnxBigAlloc, VecZnxBigScratch, VecZnxDftAlloc, VecZnxDftOps, VecZnxToMut,
  3    VecZnxToRef,
  4};
  5
  6use crate::{FourierGLWECiphertext, GLWEOps, Infos, SetMetaData, div_ceil};
  7
  8pub struct GLWECiphertext<C> {
  9    pub data: VecZnx<C>,
 10    pub basek: usize,
 11    pub k: usize,
 12}
 13
 14impl GLWECiphertext<Vec<u8>> {
 15    pub fn alloc<B: Backend>(module: &Module<B>, basek: usize, k: usize, rank: usize) -> Self {
 16        Self {
 17            data: module.new_vec_znx(rank + 1, div_ceil(k, basek)),
 18            basek,
 19            k,
 20        }
 21    }
 22
 23    pub fn bytes_of(module: &Module<FFT64>, basek: usize, k: usize, rank: usize) -> usize {
 24        module.bytes_of_vec_znx(rank + 1, div_ceil(k, basek))
 25    }
 26}
 27
 28impl<T> Infos for GLWECiphertext<T> {
 29    type Inner = VecZnx<T>;
 30
 31    fn inner(&self) -> &Self::Inner {
 32        &self.data
 33    }
 34
 35    fn basek(&self) -> usize {
 36        self.basek
 37    }
 38
 39    fn k(&self) -> usize {
 40        self.k
 41    }
 42}
 43
 44impl<T> GLWECiphertext<T> {
 45    pub fn rank(&self) -> usize {
 46        self.cols() - 1
 47    }
 48}
 49
 50impl<C: AsRef<[u8]>> GLWECiphertext<C> {
 51    #[allow(dead_code)]
 52    pub(crate) fn dft<R: AsMut<[u8]> + AsRef<[u8]>>(&self, module: &Module<FFT64>, res: &mut FourierGLWECiphertext<R, FFT64>) {
 53        #[cfg(debug_assertions)]
 54        {
 55            assert_eq!(self.rank(), res.rank());
 56            assert_eq!(self.basek(), res.basek())
 57        }
 58
 59        (0..self.rank() + 1).for_each(|i| {
 60            module.vec_znx_dft(1, 0, &mut res.data, i, &self.data, i);
 61        })
 62    }
 63}
 64
 65impl GLWECiphertext<Vec<u8>> {
 66    pub fn decrypt_scratch_space(module: &Module<FFT64>, basek: usize, k: usize) -> usize {
 67        let size: usize = div_ceil(k, basek);
 68        (module.vec_znx_big_normalize_tmp_bytes() | module.bytes_of_vec_znx_dft(1, size)) + module.bytes_of_vec_znx_big(1, size)
 69    }
 70}
 71
 72impl<DataSelf: AsMut<[u8]> + AsRef<[u8]>> SetMetaData for GLWECiphertext<DataSelf> {
 73    fn set_k(&mut self, k: usize) {
 74        self.k = k
 75    }
 76
 77    fn set_basek(&mut self, basek: usize) {
 78        self.basek = basek
 79    }
 80}
 81
 82pub trait GLWECiphertextToRef {
 83    fn to_ref(&self) -> GLWECiphertext<&[u8]>;
 84}
 85
 86impl<D: AsRef<[u8]>> GLWECiphertextToRef for GLWECiphertext<D> {
 87    fn to_ref(&self) -> GLWECiphertext<&[u8]> {
 88        GLWECiphertext {
 89            data: self.data.to_ref(),
 90            basek: self.basek,
 91            k: self.k,
 92        }
 93    }
 94}
 95
 96pub trait GLWECiphertextToMut {
 97    fn to_mut(&mut self) -> GLWECiphertext<&mut [u8]>;
 98}
 99
100impl<D: AsMut<[u8]> + AsRef<[u8]>> GLWECiphertextToMut for GLWECiphertext<D> {
101    fn to_mut(&mut self) -> GLWECiphertext<&mut [u8]> {
102        GLWECiphertext {
103            data: self.data.to_mut(),
104            basek: self.basek,
105            k: self.k,
106        }
107    }
108}
109
110impl<D> GLWEOps for GLWECiphertext<D>
111where
112    D: AsRef<[u8]> + AsMut<[u8]>,
113    GLWECiphertext<D>: GLWECiphertextToMut + Infos + SetMetaData,
114{
115}