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Add offset to blind retrieval

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This commit is contained in:
Pro7ech
2025-11-16 13:55:40 +01:00
parent b062c722a0
commit f9dcddcce1
5 changed files with 56 additions and 26 deletions
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44
poulpy-schemes/src/tfhe/bdd_arithmetic/blind_retrieval.rs
View File

@@ -17,21 +17,31 @@ impl GLWEBlindRetriever {
where
A: GLWEInfos,
{
let log2_max_address: usize = (u32::BITS - (size as u32 - 1).leading_zeros()) as usize;
let bit_size: usize = (u32::BITS - (size as u32 - 1).leading_zeros()) as usize;
Self {
accumulators: (0..log2_max_address)
accumulators: (0..bit_size)
.map(|_| Accumulator::alloc(infos))
.collect_vec(),
counter: 0,
}
}
pub fn retrieve_tmp_bytes<M, R, S, BE: Backend>(module: &M, res: &R, selector: &S) -> usize
where
M: Cmux<BE>,
R: GLWEInfos,
S: GGSWInfos,
{
module.cmux_tmp_bytes(res, res, selector)
}
pub fn retrieve<M, R, A, S, BE: Backend>(
&mut self,
module: &M,
res: &mut R,
data: &[A],
selector: &S,
offset: usize,
scratch: &mut Scratch<BE>,
) where
M: GLWECopy + Cmux<BE>,
@@ -41,14 +51,13 @@ impl GLWEBlindRetriever {
Scratch<BE>: ScratchTakeCore<BE>,
{
self.reset();
for ct in data {
self.add(module, ct, selector, scratch);
self.add(module, ct, selector, offset, scratch);
}
self.flush(module, res, selector, scratch);
self.flush(module, res, selector, offset, scratch);
}
pub fn add<A, S, M, BE: Backend>(&mut self, module: &M, a: &A, selector: &S, scratch: &mut Scratch<BE>)
pub fn add<A, S, M, BE: Backend>(&mut self, module: &M, a: &A, selector: &S, offset: usize, scratch: &mut Scratch<BE>)
where
A: GLWEToRef,
S: GetGGSWBit<BE>,
@@ -61,11 +70,19 @@ impl GLWEBlindRetriever {
1 << self.accumulators.len()
);
add_core(module, a, &mut self.accumulators, 0, selector, scratch);
add_core(
module,
a,
&mut self.accumulators,
0,
selector,
offset,
scratch,
);
self.counter += 1;
}
pub fn flush<R, M, S, BE: Backend>(&mut self, module: &M, res: &mut R, selector: &S, scratch: &mut Scratch<BE>)
pub fn flush<R, M, S, BE: Backend>(&mut self, module: &M, res: &mut R, selector: &S, offset: usize, scratch: &mut Scratch<BE>)
where
R: GLWEToMut,
S: GetGGSWBit<BE>,
@@ -81,6 +98,7 @@ impl GLWEBlindRetriever {
acc_next,
i + 1,
selector,
offset,
scratch,
);
acc_prev[0].num = 0
@@ -94,6 +112,7 @@ impl GLWEBlindRetriever {
for acc in self.accumulators.iter_mut() {
acc.num = 0;
}
self.counter = 0;
}
}
@@ -120,6 +139,7 @@ fn add_core<A, S, M, BE: Backend>(
accumulators: &mut [Accumulator],
i: usize,
selector: &S,
offset: usize,
scratch: &mut Scratch<BE>,
) where
A: GLWEToRef,
@@ -136,7 +156,12 @@ fn add_core<A, S, M, BE: Backend>(
acc_prev[0].num = 1;
}
1 => {
module.cmux_inplace_neg(&mut acc_prev[0].data, a, &selector.get_bit(i), scratch);
module.cmux_inplace_neg(
&mut acc_prev[0].data,
a,
&selector.get_bit(i + offset),
scratch,
);
if !acc_next.is_empty() {
add_core(
@@ -145,6 +170,7 @@ fn add_core<A, S, M, BE: Backend>(
acc_next,
i + 1,
selector,
offset,
scratch,
);
}

14
poulpy-schemes/src/tfhe/bdd_arithmetic/blind_rotation.rs
View File

@@ -11,14 +11,14 @@ use crate::tfhe::bdd_arithmetic::{Cmux, GetGGSWBit, UnsignedInteger};
impl<T: UnsignedInteger, BE: Backend> GGSWBlindRotation<T, BE> for Module<BE>
where
Self: GLWEBlindRotation<T, BE> + VecZnxAddScalarInplace + VecZnxNormalizeInplace<BE>,
Self: GLWEBlindRotation<BE> + VecZnxAddScalarInplace + VecZnxNormalizeInplace<BE>,
Scratch<BE>: ScratchTakeCore<BE>,
{
}
pub trait GGSWBlindRotation<T: UnsignedInteger, BE: Backend>
where
Self: GLWEBlindRotation<T, BE> + VecZnxAddScalarInplace + VecZnxNormalizeInplace<BE>,
Self: GLWEBlindRotation<BE> + VecZnxAddScalarInplace + VecZnxNormalizeInplace<BE>,
{
fn ggsw_to_ggsw_blind_rotation_tmp_bytes<R, K>(&self, res_infos: &R, k_infos: &K) -> usize
where
@@ -161,14 +161,14 @@ where
}
}
impl<T: UnsignedInteger, BE: Backend> GLWEBlindRotation<T, BE> for Module<BE>
impl<BE: Backend> GLWEBlindRotation<BE> for Module<BE>
where
Self: GLWECopy + GLWERotate<BE> + Cmux<BE>,
Scratch<BE>: ScratchTakeCore<BE>,
{
}
pub trait GLWEBlindRotation<T: UnsignedInteger, BE: Backend>
pub trait GLWEBlindRotation<BE: Backend>
where
Self: GLWECopy + GLWERotate<BE> + Cmux<BE>,
{
@@ -184,7 +184,7 @@ where
fn glwe_blind_rotation_inplace<R, K>(
&self,
res: &mut R,
fhe_uint: &K,
value: &K,
sign: bool,
bit_rsh: usize,
bit_mask: usize,
@@ -195,8 +195,6 @@ where
K: GetGGSWBit<BE>,
Scratch<BE>: ScratchTakeCore<BE>,
{
assert!(bit_rsh + bit_mask <= T::BITS as usize);
let mut res: GLWE<&mut [u8]> = res.to_mut();
let (mut tmp_res, scratch_1) = scratch.take_glwe(&res);
@@ -219,7 +217,7 @@ where
}
// b <- (b - a) * GGSW(b[i]) + a
self.cmux_inplace(b, a, &fhe_uint.get_bit(i + bit_rsh), scratch_1);
self.cmux_inplace(b, a, &value.get_bit(i + bit_rsh), scratch_1);
// ping-pong roles for next iter
a_is_res = !a_is_res;

6
poulpy-schemes/src/tfhe/bdd_arithmetic/eval.rs
View File

@@ -471,16 +471,16 @@ where
+ VecZnxBigNormalize<BE>
+ VecZnxBigNormalizeTmpBytes,
{
fn cmux_tmp_bytes<R, A, B>(&self, res_infos: &R, a_infos: &A, b_infos: &B) -> usize
fn cmux_tmp_bytes<R, A, B>(&self, res_infos: &R, a_infos: &A, selector_infos: &B) -> usize
where
R: GLWEInfos,
A: GLWEInfos,
B: GGSWInfos,
{
let res_dft: usize = self.bytes_of_vec_znx_dft((b_infos.rank() + 1).into(), b_infos.size());
let res_dft: usize = self.bytes_of_vec_znx_dft((selector_infos.rank() + 1).into(), selector_infos.size());
res_dft
+ self
.glwe_external_product_internal_tmp_bytes(res_infos, a_infos, b_infos)
.glwe_external_product_internal_tmp_bytes(res_infos, a_infos, selector_infos)
.max(self.vec_znx_big_normalize_tmp_bytes())
}

2
poulpy-schemes/src/tfhe/bdd_arithmetic/tests/test_suite/glwe_blind_rotation.rs
View File

@@ -26,7 +26,7 @@ where
+ GLWESecretPreparedFactory<BE>
+ GGSWPreparedFactory<BE>
+ GGSWEncryptSk<BE>
+ GLWEBlindRotation<u32, BE>
+ GLWEBlindRotation<BE>
+ GLWEDecrypt<BE>
+ GLWEEncryptSk<BE>,
ScratchOwned<BE>: ScratchOwnedAlloc<BE> + ScratchOwnedBorrow<BE>,

16
poulpy-schemes/src/tfhe/bdd_arithmetic/tests/test_suite/swap.rs
View File

@@ -178,22 +178,28 @@ where
})
.collect_vec();
let mut retriever: GLWEBlindRetriever = GLWEBlindRetriever::alloc(&glwe_infos, data.len());
for idx in 0..data.len() as u32 {
let offset = 2;
let mut idx_enc: FheUintPrepared<Vec<u8>, u32, BE> = FheUintPrepared::alloc_from_infos(module, &ggsw_infos);
idx_enc.encrypt_sk(
module,
idx,
idx << offset,
sk,
&mut source_xa,
&mut source_xe,
scratch.borrow(),
);
let mut retriever: GLWEBlindRetriever = GLWEBlindRetriever::alloc(&glwe_infos, 25);
let mut res: FheUint<Vec<u8>, u32> = FheUint::alloc_from_infos(&glwe_infos);
retriever.retrieve(module, &mut res, &data_enc, &idx_enc, scratch.borrow());
println!("{}", res.decrypt(module, sk, scratch.borrow()));
retriever.retrieve(
module,
&mut res,
&data_enc,
&idx_enc,
offset,
scratch.borrow(),
);
assert_eq!(
data[idx as usize],