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Two changes:

Browse Source 
- Fix setting `k` in `GlweOps`
- Improve GLWEPacker API avoid accumulating beyond limit (#50)
This commit is contained in:
Janmajaya Mall
2025-07-09 16:23:56 +05:30
parent b99f43aa0f
commit 64edc869d0
5 changed files with 79 additions and 78 deletions
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8
backend/src/vec_znx.rs
View File

@@ -111,10 +111,10 @@ impl<D: AsMut<[u8]> + AsRef<[u8]>> VecZnx<D> {
}
}
pub fn rotate(&mut self, k: i64){
unsafe{
(0..self.cols()).for_each(|i|{
(0..self.size()).for_each(|j|{
pub fn rotate(&mut self, k: i64) {
unsafe {
(0..self.cols()).for_each(|i| {
(0..self.size()).for_each(|j| {
znx::znx_rotate_inplace_i64(self.n() as u64, k, self.at_mut_ptr(i, j));
});
})

2
core/src/elem.rs
View File

@@ -34,7 +34,7 @@ pub trait Infos {
/// Returns the number of size per polynomial.
fn size(&self) -> usize {
let size: usize = self.inner().size();
debug_assert_eq!(size, self.k().div_ceil(self.basek()));
debug_assert!(size >= self.k().div_ceil(self.basek()));
size
}

45
core/src/glwe/ops.rs
View File

@@ -2,7 +2,7 @@ use backend::{FFT64, Module, Scratch, VecZnx, VecZnxOps, ZnxZero};
use crate::{GLWECiphertext, GLWECiphertextToMut, GLWECiphertextToRef, Infos, SetMetaData};
pub trait GLWEOps: GLWECiphertextToMut + SetMetaData {
pub trait GLWEOps: GLWECiphertextToMut + SetMetaData + Sized {
fn add<A, B>(&mut self, module: &Module<FFT64>, a: &A, b: &B)
where
A: GLWECiphertextToRef,
@@ -14,7 +14,6 @@ pub trait GLWEOps: GLWECiphertextToMut + SetMetaData {
assert_eq!(b.n(), module.n());
assert_eq!(self.n(), module.n());
assert_eq!(a.basek(), b.basek());
assert_eq!(self.basek(), a.basek());
assert!(self.rank() >= a.rank().max(b.rank()));
}
@@ -47,8 +46,8 @@ pub trait GLWEOps: GLWECiphertextToMut + SetMetaData {
});
});
// self.set_basek(a.basek());
// self.set_k(a.k().max(b.k()));
self.set_basek(a.basek());
self.set_k(set_k(self, a, b));
}
fn add_inplace<A>(&mut self, module: &Module<FFT64>, a: &A)
@@ -70,7 +69,9 @@ pub trait GLWEOps: GLWECiphertextToMut + SetMetaData {
module.vec_znx_add_inplace(&mut self_mut.data, i, &a_ref.data, i);
});
self.set_k(a.k().max(self.k()));
if a.rank() != 0 {
self.set_k(a.k().min(self.k()));
}
}
fn sub<A, B>(&mut self, module: &Module<FFT64>, a: &A, b: &B)
@@ -118,7 +119,7 @@ pub trait GLWEOps: GLWECiphertextToMut + SetMetaData {
});
self.set_basek(a.basek());
self.set_k(a.k().max(b.k()));
self.set_k(set_k(self, a, b));
}
fn sub_inplace_ab<A>(&mut self, module: &Module<FFT64>, a: &A)
@@ -140,7 +141,9 @@ pub trait GLWEOps: GLWECiphertextToMut + SetMetaData {
module.vec_znx_sub_ab_inplace(&mut self_mut.data, i, &a_ref.data, i);
});
self.set_k(a.k().max(self.k()));
if a.rank() != 0 {
self.set_k(a.k().min(self.k()));
}
}
fn sub_inplace_ba<A>(&mut self, module: &Module<FFT64>, a: &A)
@@ -162,7 +165,9 @@ pub trait GLWEOps: GLWECiphertextToMut + SetMetaData {
module.vec_znx_sub_ba_inplace(&mut self_mut.data, i, &a_ref.data, i);
});
self.set_k(a.k().max(self.k()));
if a.rank() != 0 {
self.set_k(a.k().min(self.k()));
}
}
fn rotate<A>(&mut self, module: &Module<FFT64>, k: i64, a: &A)
@@ -184,7 +189,9 @@ pub trait GLWEOps: GLWECiphertextToMut + SetMetaData {
});
self.set_basek(a.basek());
self.set_k(a.k());
if a.rank() != 0 {
self.set_k(a.k().min(self.k()));
}
}
fn rotate_inplace(&mut self, module: &Module<FFT64>, k: i64) {
@@ -209,6 +216,8 @@ pub trait GLWEOps: GLWECiphertextToMut + SetMetaData {
assert_eq!(self.n(), module.n());
assert_eq!(a.n(), module.n());
assert_eq!(self.rank(), a.rank());
assert_eq!(self.k(), a.k());
assert_eq!(self.basek(), a.basek());
}
let self_mut: &mut GLWECiphertext<&mut [u8]> = &mut self.to_mut();
@@ -246,7 +255,7 @@ pub trait GLWEOps: GLWECiphertextToMut + SetMetaData {
module.vec_znx_normalize(a.basek(), &mut self_mut.data, i, &a_ref.data, i, scratch);
});
self.set_basek(a.basek());
self.set_k(a.k());
self.set_k(a.k().min(self.k()));
}
fn normalize_inplace(&mut self, module: &Module<FFT64>, scratch: &mut Scratch) {
@@ -266,3 +275,19 @@ impl GLWECiphertext<Vec<u8>> {
VecZnx::rsh_scratch_space(module.n())
}
}
// c = op(a, b)
fn set_k(c: &impl Infos, a: &impl Infos, b: &impl Infos) -> usize {
if a.rank() != 0 || b.rank() != 0 {
let k = if a.rank() == 0 {
b.k()
} else if b.rank() == 0 {
a.k()
} else {
a.k().min(b.k())
};
k.min(c.k())
} else {
c.k()
}
}

48
core/src/glwe/packing.rs
View File

@@ -1,7 +1,7 @@
use crate::{GLWEAutomorphismKey, GLWECiphertext, GLWEOps, Infos, ScratchCore};
use std::collections::HashMap;
use backend::{FFT64, Module, Scratch};
use backend::{FFT64, Module, Scratch, VecZnxOps};
/// [StreamPacker] enables only the fly GLWE packing
/// with constant memory of Log(N) ciphertexts.
@@ -65,7 +65,7 @@ impl GLWEPacker {
}
/// Implicit reset of the internal state (to be called before a new packing procedure).
pub fn reset(&mut self) {
fn reset(&mut self) {
for i in 0..self.accumulators.len() {
self.accumulators[i].value = false;
self.accumulators[i].control = false;
@@ -82,9 +82,7 @@ impl GLWEPacker {
GLWECiphertext::trace_galois_elements(module)
}
/// Adds a GLWE ciphertext to the [StreamPacker]. And propagates
/// intermediate results among the [Accumulator]s.
///
/// Adds a GLWE ciphertext to the [StreamPacker].
/// #Arguments
///
/// * `module`: static backend FFT tables.
@@ -96,11 +94,16 @@ impl GLWEPacker {
pub fn add<DataA: AsRef<[u8]>, DataAK: AsRef<[u8]>>(
&mut self,
module: &Module<FFT64>,
res: &mut Vec<GLWECiphertext<Vec<u8>>>,
a: Option<&GLWECiphertext<DataA>>,
auto_keys: &HashMap<i64, GLWEAutomorphismKey<DataAK, FFT64>>,
scratch: &mut Scratch,
) {
assert!(
self.counter < module.n(),
"Packing limit of {} reached",
module.n() >> self.log_batch
);
pack_core(
module,
a,
@@ -110,35 +113,18 @@ impl GLWEPacker {
scratch,
);
self.counter += 1 << self.log_batch;
if self.counter == module.n() {
res.push(
self.accumulators[module.log_n() - self.log_batch - 1]
.data
.clone(),
);
self.reset();
}
}
/// Flushes all accumlators and appends the result to `res`.
pub fn flush<DataAK: AsRef<[u8]>>(
&mut self,
module: &Module<FFT64>,
res: &mut Vec<GLWECiphertext<Vec<u8>>>,
auto_keys: &HashMap<i64, GLWEAutomorphismKey<DataAK, FFT64>>,
scratch: &mut Scratch,
) {
if self.counter != 0 {
while self.counter != 0 {
self.add(
/// Flush result to`res`.
pub fn flush<Data: AsMut<[u8]> + AsRef<[u8]>>(&mut self, module: &Module<FFT64>, res: &mut GLWECiphertext<Data>) {
assert!(self.counter == module.n());
// Copy result GLWE into res GLWE
res.copy(
module,
res,
None::<&GLWECiphertext<Vec<u8>>>,
auto_keys,
scratch,
&self.accumulators[module.log_n() - self.log_batch - 1].data,
);
}
}
self.reset();
}
}

18
core/src/glwe/test_fft64/packing.rs
View File

@@ -74,8 +74,6 @@ fn apply() {
scratch.borrow(),
);
let mut res: Vec<GLWECiphertext<Vec<u8>>> = Vec::new();
(0..module.n() >> log_batch).for_each(|i| {
ct.encrypt_sk(
&module,
@@ -90,11 +88,10 @@ fn apply() {
pt.rotate_inplace(&module, -(1 << log_batch)); // X^-batch * pt
if reverse_bits_msb(i, log_n as u32) % 5 == 0 {
packer.add(&module, &mut res, Some(&ct), &auto_keys, scratch.borrow());
packer.add(&module, Some(&ct), &auto_keys, scratch.borrow());
} else {
packer.add(
&module,
&mut res,
None::<&GLWECiphertext<Vec<u8>>>,
&auto_keys,
scratch.borrow(),
@@ -102,12 +99,10 @@ fn apply() {
}
});
packer.flush(&module, &mut res, &auto_keys, scratch.borrow());
packer.reset();
let mut res = GLWECiphertext::alloc(&module, basek, k_ct, rank);
packer.flush(&module, &mut res);
let mut pt_want: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::alloc(&module, basek, k_ct);
res.iter().enumerate().for_each(|(i, res_i)| {
let mut data: Vec<i64> = vec![0i64; module.n()];
data.iter_mut().enumerate().for_each(|(i, x)| {
if i % 5 == 0 {
@@ -116,13 +111,9 @@ fn apply() {
});
pt_want.data.encode_vec_i64(0, basek, pt_k, &data, 32);
res_i.decrypt(&module, &mut pt, &sk_dft, scratch.borrow());
res.decrypt(&module, &mut pt, &sk_dft, scratch.borrow());
if i & 1 == 0 {
pt.sub_inplace_ab(&module, &pt_want);
} else {
pt.add_inplace(&module, &pt_want);
}
let noise_have = pt.data.std(0, basek).log2();
// println!("noise_have: {}", noise_have);
@@ -131,7 +122,6 @@ fn apply() {
"noise: {}",
noise_have
);
});
}
#[inline(always)]