1use std::collections::HashMap;
  2
  3use poulpy_backend::hal::{
  4    api::{
  5        ScratchAvailable, TakeVecZnxDft, VecZnxBigAddSmallInplace, VecZnxBigAutomorphismInplace, VecZnxBigNormalize,
  6        VecZnxBigNormalizeTmpBytes, VecZnxCopy, VecZnxDftAllocBytes, VecZnxDftFromVecZnx, VecZnxDftToVecZnxBigConsume,
  7        VecZnxRshInplace, VmpApply, VmpApplyAdd, VmpApplyTmpBytes,
  8    },
  9    layouts::{Backend, DataMut, DataRef, Module, Scratch},
 10};
 11
 12use crate::{
 13    layouts::{GLWECiphertext, prepared::GGLWEAutomorphismKeyPrepared},
 14    operations::GLWEOperations,
 15};
 16
 17impl GLWECiphertext<Vec<u8>> {
 18    pub fn trace_galois_elements<B: Backend>(module: &Module<B>) -> Vec<i64> {
 19        let mut gal_els: Vec<i64> = Vec::new();
 20        (0..module.log_n()).for_each(|i| {
 21            if i == 0 {
 22                gal_els.push(-1);
 23            } else {
 24                gal_els.push(module.galois_element(1 << (i - 1)));
 25            }
 26        });
 27        gal_els
 28    }
 29
 30    #[allow(clippy::too_many_arguments)]
 31    pub fn trace_scratch_space<B: Backend>(
 32        module: &Module<B>,
 33        n: usize,
 34        basek: usize,
 35        out_k: usize,
 36        in_k: usize,
 37        ksk_k: usize,
 38        digits: usize,
 39        rank: usize,
 40    ) -> usize
 41    where
 42        Module<B>: VecZnxDftAllocBytes + VmpApplyTmpBytes + VecZnxBigNormalizeTmpBytes,
 43    {
 44        Self::automorphism_inplace_scratch_space(module, n, basek, out_k.min(in_k), ksk_k, digits, rank)
 45    }
 46
 47    pub fn trace_inplace_scratch_space<B: Backend>(
 48        module: &Module<B>,
 49        n: usize,
 50        basek: usize,
 51        out_k: usize,
 52        ksk_k: usize,
 53        digits: usize,
 54        rank: usize,
 55    ) -> usize
 56    where
 57        Module<B>: VecZnxDftAllocBytes + VmpApplyTmpBytes + VecZnxBigNormalizeTmpBytes,
 58    {
 59        Self::automorphism_inplace_scratch_space(module, n, basek, out_k, ksk_k, digits, rank)
 60    }
 61}
 62
 63impl<DataSelf: DataMut> GLWECiphertext<DataSelf> {
 64    pub fn trace<DataLhs: DataRef, DataAK: DataRef, B: Backend>(
 65        &mut self,
 66        module: &Module<B>,
 67        start: usize,
 68        end: usize,
 69        lhs: &GLWECiphertext<DataLhs>,
 70        auto_keys: &HashMap<i64, GGLWEAutomorphismKeyPrepared<DataAK, B>>,
 71        scratch: &mut Scratch<B>,
 72    ) where
 73        Module<B>: VecZnxDftAllocBytes
 74            + VmpApplyTmpBytes
 75            + VecZnxBigNormalizeTmpBytes
 76            + VmpApply<B>
 77            + VmpApplyAdd<B>
 78            + VecZnxDftFromVecZnx<B>
 79            + VecZnxDftToVecZnxBigConsume<B>
 80            + VecZnxBigAddSmallInplace<B>
 81            + VecZnxBigNormalize<B>
 82            + VecZnxBigAutomorphismInplace<B>
 83            + VecZnxRshInplace
 84            + VecZnxCopy,
 85        Scratch<B>: TakeVecZnxDft<B> + ScratchAvailable,
 86    {
 87        self.copy(module, lhs);
 88        self.trace_inplace(module, start, end, auto_keys, scratch);
 89    }
 90
 91    pub fn trace_inplace<DataAK: DataRef, B: Backend>(
 92        &mut self,
 93        module: &Module<B>,
 94        start: usize,
 95        end: usize,
 96        auto_keys: &HashMap<i64, GGLWEAutomorphismKeyPrepared<DataAK, B>>,
 97        scratch: &mut Scratch<B>,
 98    ) where
 99        Module<B>: VecZnxDftAllocBytes
100            + VmpApplyTmpBytes
101            + VecZnxBigNormalizeTmpBytes
102            + VmpApply<B>
103            + VmpApplyAdd<B>
104            + VecZnxDftFromVecZnx<B>
105            + VecZnxDftToVecZnxBigConsume<B>
106            + VecZnxBigAddSmallInplace<B>
107            + VecZnxBigNormalize<B>
108            + VecZnxBigAutomorphismInplace<B>
109            + VecZnxRshInplace,
110        Scratch<B>: TakeVecZnxDft<B> + ScratchAvailable,
111    {
112        (start..end).for_each(|i| {
113            self.rsh(module, 1);
114
115            let p: i64 = if i == 0 {
116                -1
117            } else {
118                module.galois_element(1 << (i - 1))
119            };
120
121            if let Some(key) = auto_keys.get(&p) {
122                self.automorphism_add_inplace(module, key, scratch);
123            } else {
124                panic!("auto_keys[{}] is empty", p)
125            }
126        });
127    }
128}