1use std::fmt;
  2
  3use poulpy_hal::layouts::{Backend, Data, DataMut, DataRef, Module, Zn, ZnToMut, ZnToRef, ZnxInfos};
  4
  5use crate::layouts::{Base2K, Degree, LWEInfos, TorusPrecision};
  6
  7#[derive(PartialEq, Eq, Copy, Clone, Debug)]
  8pub struct LWEPlaintextLayout {
  9    k: TorusPrecision,
 10    base2k: Base2K,
 11}
 12
 13impl LWEInfos for LWEPlaintextLayout {
 14    fn base2k(&self) -> Base2K {
 15        self.base2k
 16    }
 17
 18    fn k(&self) -> TorusPrecision {
 19        self.k
 20    }
 21
 22    fn n(&self) -> Degree {
 23        Degree(0)
 24    }
 25
 26    fn size(&self) -> usize {
 27        self.k.0.div_ceil(self.base2k.0) as usize
 28    }
 29}
 30
 31pub struct LWEPlaintext<D: Data> {
 32    pub(crate) data: Zn<D>,
 33    pub(crate) k: TorusPrecision,
 34    pub(crate) base2k: Base2K,
 35}
 36
 37impl<D: Data> LWEInfos for LWEPlaintext<D> {
 38    fn base2k(&self) -> Base2K {
 39        self.base2k
 40    }
 41
 42    fn k(&self) -> TorusPrecision {
 43        self.k
 44    }
 45
 46    fn n(&self) -> Degree {
 47        Degree(self.data.n() as u32 - 1)
 48    }
 49
 50    fn size(&self) -> usize {
 51        self.data.size()
 52    }
 53}
 54
 55pub trait LWEPlaintextAlloc {
 56    fn alloc_lwe_plaintext(&self, base2k: Base2K, k: TorusPrecision) -> LWEPlaintext<Vec<u8>> {
 57        LWEPlaintext {
 58            data: Zn::alloc(1, 1, k.0.div_ceil(base2k.0) as usize),
 59            k,
 60            base2k,
 61        }
 62    }
 63
 64    fn alloc_lwe_plaintext_from_infos<A>(&self, infos: &A) -> LWEPlaintext<Vec<u8>>
 65    where
 66        A: LWEInfos,
 67    {
 68        self.alloc_lwe_plaintext(infos.base2k(), infos.k())
 69    }
 70}
 71
 72impl<B: Backend> LWEPlaintextAlloc for Module<B> {}
 73
 74impl LWEPlaintext<Vec<u8>> {
 75    pub fn alloc_from_infos<A, M>(module: &M, infos: &A) -> Self
 76    where
 77        A: LWEInfos,
 78        M: LWEPlaintextAlloc,
 79    {
 80        module.alloc_lwe_plaintext_from_infos(infos)
 81    }
 82
 83    pub fn alloc<M>(module: &M, base2k: Base2K, k: TorusPrecision) -> Self
 84    where
 85        M: LWEPlaintextAlloc,
 86    {
 87        module.alloc_lwe_plaintext(base2k, k)
 88    }
 89}
 90
 91impl<D: DataRef> fmt::Display for LWEPlaintext<D> {
 92    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 93        write!(
 94            f,
 95            "LWEPlaintext: base2k={} k={}: {}",
 96            self.base2k().0,
 97            self.k().0,
 98            self.data
 99        )
100    }
101}
102
103pub trait LWEPlaintextToRef {
104    #[allow(dead_code)]
105    fn to_ref(&self) -> LWEPlaintext<&[u8]>;
106}
107
108impl<D: DataRef> LWEPlaintextToRef for LWEPlaintext<D> {
109    fn to_ref(&self) -> LWEPlaintext<&[u8]> {
110        LWEPlaintext {
111            data: self.data.to_ref(),
112            base2k: self.base2k,
113            k: self.k,
114        }
115    }
116}
117
118pub trait LWEPlaintextToMut {
119    #[allow(dead_code)]
120    fn to_mut(&mut self) -> LWEPlaintext<&mut [u8]>;
121}
122
123impl<D: DataMut> LWEPlaintextToMut for LWEPlaintext<D> {
124    fn to_mut(&mut self) -> LWEPlaintext<&mut [u8]> {
125        LWEPlaintext {
126            data: self.data.to_mut(),
127            base2k: self.base2k,
128            k: self.k,
129        }
130    }
131}
132
133impl<D: DataMut> LWEPlaintext<D> {
134    pub fn data_mut(&mut self) -> &mut Zn<D> {
135        &mut self.data
136    }
137}