1use std::collections::HashMap;
  2
  3use poulpy_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        basek: usize,
 34        out_k: usize,
 35        in_k: usize,
 36        ksk_k: usize,
 37        digits: usize,
 38        rank: usize,
 39    ) -> usize
 40    where
 41        Module<B>: VecZnxDftAllocBytes + VmpApplyTmpBytes + VecZnxBigNormalizeTmpBytes,
 42    {
 43        Self::automorphism_inplace_scratch_space(module, basek, out_k.min(in_k), ksk_k, digits, rank)
 44    }
 45
 46    pub fn trace_inplace_scratch_space<B: Backend>(
 47        module: &Module<B>,
 48        basek: usize,
 49        out_k: usize,
 50        ksk_k: usize,
 51        digits: usize,
 52        rank: usize,
 53    ) -> usize
 54    where
 55        Module<B>: VecZnxDftAllocBytes + VmpApplyTmpBytes + VecZnxBigNormalizeTmpBytes,
 56    {
 57        Self::automorphism_inplace_scratch_space(module, basek, out_k, ksk_k, digits, rank)
 58    }
 59}
 60
 61impl<DataSelf: DataMut> GLWECiphertext<DataSelf> {
 62    pub fn trace<DataLhs: DataRef, DataAK: DataRef, B: Backend>(
 63        &mut self,
 64        module: &Module<B>,
 65        start: usize,
 66        end: usize,
 67        lhs: &GLWECiphertext<DataLhs>,
 68        auto_keys: &HashMap<i64, GGLWEAutomorphismKeyPrepared<DataAK, B>>,
 69        scratch: &mut Scratch<B>,
 70    ) where
 71        Module<B>: VecZnxDftAllocBytes
 72            + VmpApplyTmpBytes
 73            + VecZnxBigNormalizeTmpBytes
 74            + VmpApply<B>
 75            + VmpApplyAdd<B>
 76            + VecZnxDftFromVecZnx<B>
 77            + VecZnxDftToVecZnxBigConsume<B>
 78            + VecZnxBigAddSmallInplace<B>
 79            + VecZnxBigNormalize<B>
 80            + VecZnxBigAutomorphismInplace<B>
 81            + VecZnxRshInplace
 82            + VecZnxCopy,
 83        Scratch<B>: TakeVecZnxDft<B> + ScratchAvailable,
 84    {
 85        self.copy(module, lhs);
 86        self.trace_inplace(module, start, end, auto_keys, scratch);
 87    }
 88
 89    pub fn trace_inplace<DataAK: DataRef, B: Backend>(
 90        &mut self,
 91        module: &Module<B>,
 92        start: usize,
 93        end: usize,
 94        auto_keys: &HashMap<i64, GGLWEAutomorphismKeyPrepared<DataAK, B>>,
 95        scratch: &mut Scratch<B>,
 96    ) where
 97        Module<B>: VecZnxDftAllocBytes
 98            + VmpApplyTmpBytes
 99            + VecZnxBigNormalizeTmpBytes
100            + VmpApply<B>
101            + VmpApplyAdd<B>
102            + VecZnxDftFromVecZnx<B>
103            + VecZnxDftToVecZnxBigConsume<B>
104            + VecZnxBigAddSmallInplace<B>
105            + VecZnxBigNormalize<B>
106            + VecZnxBigAutomorphismInplace<B>
107            + VecZnxRshInplace,
108        Scratch<B>: TakeVecZnxDft<B> + ScratchAvailable,
109    {
110        (start..end).for_each(|i| {
111            self.rsh(module, 1);
112
113            let p: i64 = if i == 0 {
114                -1
115            } else {
116                module.galois_element(1 << (i - 1))
117            };
118
119            if let Some(key) = auto_keys.get(&p) {
120                self.automorphism_add_inplace(module, key, scratch);
121            } else {
122                panic!("auto_keys[{}] is empty", p)
123            }
124        });
125    }
126}