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rework as discussed

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This commit is contained in:
Jean-Philippe Bossuat
2025-05-05 17:35:35 +02:00
parent bd105497fd
commit ffa363804b
16 changed files with 1154 additions and 1153 deletions
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43
base2k/examples/rlwe_encrypt.rs
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@@ -1,6 +1,7 @@
use base2k::{
Encoding, FFT64, Module, Sampling, ScalarAlloc, ScalarZnxDftAlloc, ScalarZnxDftOps, ScratchOwned, VecZnxAlloc, VecZnxBigOps,
VecZnxBigScratch, VecZnxDftAlloc, VecZnxDftOps, ZnxInfos,
Encoding, FFT64, Module, Sampling, Scalar, ScalarAlloc, ScalarZnxDft, ScalarZnxDftAlloc, ScalarZnxDftOps, ScratchOwned,
VecZnx, VecZnxAlloc, VecZnxBig, VecZnxBigAlloc, VecZnxBigOps, VecZnxBigScratch, VecZnxDft, VecZnxDftAlloc, VecZnxDftOps,
VecZnxOps, ZnxInfos,
};
use itertools::izip;
use sampling::source::Source;
@@ -13,24 +14,23 @@ fn main() {
let log_scale: usize = msg_size * log_base2k - 5;
let module: Module<FFT64> = Module::<FFT64>::new(n);
let mut scratch =
ScratchOwned::new((2 * module.bytes_of_vec_znx_dft(1, ct_size)) + 2 * module.vec_znx_big_normalize_tmp_bytes());
let mut scratch: ScratchOwned = ScratchOwned::new(module.vec_znx_big_normalize_tmp_bytes());
let seed: [u8; 32] = [0; 32];
let mut source: Source = Source::new(seed);
// s <- Z_{-1, 0, 1}[X]/(X^{N}+1)
let mut s = module.new_scalar(1);
let mut s: Scalar<Vec<u8>> = module.new_scalar(1);
s.fill_ternary_prob(0, 0.5, &mut source);
// Buffer to store s in the DFT domain
let mut s_dft = module.new_scalar_znx_dft(s.cols());
let mut s_dft: ScalarZnxDft<Vec<u8>, FFT64> = module.new_scalar_znx_dft(s.cols());
// s_dft <- DFT(s)
module.svp_prepare(&mut s_dft, 0, &s, 0);
// Allocates a VecZnx with two columns: ct=(0, 0)
let mut ct = module.new_vec_znx(
let mut ct: VecZnx<Vec<u8>> = module.new_vec_znx(
2, // Number of columns
ct_size, // Number of small poly per column
);
@@ -38,12 +38,10 @@ fn main() {
// Fill the second column with random values: ct = (0, a)
module.fill_uniform(log_base2k, &mut ct, 1, ct_size, &mut source);
// Scratch space for DFT values
let scratch = scratch.borrow();
let (mut buf_dft, scratch) = scratch.tmp_vec_znx_dft(&module, 1, ct_size);
let mut buf_dft: VecZnxDft<Vec<u8>, FFT64> = module.new_vec_znx_dft(1, ct_size);
// Applies DFT(ct[1]) * DFT(s)
module.svp_apply_dft(
module.svp_apply(
&mut buf_dft, // DFT(ct[1] * s)
0, // Selects the first column of res
&s_dft, // DFT(s)
@@ -53,11 +51,10 @@ fn main() {
);
// Alias scratch space (VecZnxDft<B> is always at least as big as VecZnxBig<B>)
let (mut buf_big, scratch) = scratch.tmp_vec_znx_big(&module, 1, ct_size);
// BIG(ct[1] * s) <- IDFT(DFT(ct[1] * s)) (not normalized)
// Note: Since `vec_znx_idft_tmp_a` takes no argument for generic `Data` a full qualified path seems necessary
<Module<_> as VecZnxDftOps<_, &[u8], _>>::vec_znx_idft_tmp_a(&module, &mut buf_big, 0, &mut buf_dft, 0);
let mut buf_big: VecZnxBig<Vec<u8>, FFT64> = module.new_vec_znx_big(1, ct_size);
module.vec_znx_idft_tmp_a(&mut buf_big, 0, &mut buf_dft, 0);
// Creates a plaintext: VecZnx with 1 column
let mut m = module.new_vec_znx(
@@ -68,8 +65,7 @@ fn main() {
want.iter_mut()
.for_each(|x| *x = source.next_u64n(16, 15) as i64);
m.encode_vec_i64(0, log_base2k, log_scale, &want, 4);
let (tmp_bytes_norm, scratch) = scratch.tmp_scalar_slice(n * std::mem::size_of::<i64>());
m.normalize(log_base2k, 0, tmp_bytes_norm);
module.vec_znx_normalize_inplace(log_base2k, &mut m, 0, scratch.borrow());
// m - BIG(ct[1] * s)
module.vec_znx_big_sub_small_b_inplace(
@@ -82,9 +78,12 @@ fn main() {
// Normalizes back to VecZnx
// ct[0] <- m - BIG(c1 * s)
module.vec_znx_big_normalize(
log_base2k, &mut ct, 0, // Selects the first column of ct (ct[0])
&buf_big, 0, // Selects the first column of buf_big
scratch,
log_base2k,
&mut ct,
0, // Selects the first column of ct (ct[0])
&buf_big,
0, // Selects the first column of buf_big
scratch.borrow(),
);
// Add noise to ct[0]
@@ -104,7 +103,7 @@ fn main() {
// Decryption
// DFT(ct[1] * s)
module.svp_apply_dft(
module.svp_apply(
&mut buf_dft,
0, // Selects the first column of res.
&s_dft,
@@ -114,14 +113,14 @@ fn main() {
);
// BIG(c1 * s) = IDFT(DFT(c1 * s))
<Module<_> as VecZnxDftOps<_, &[u8], _>>::vec_znx_idft_tmp_a(&module, &mut buf_big, 0, &mut buf_dft, 0);
module.vec_znx_idft_tmp_a(&mut buf_big, 0, &mut buf_dft, 0);
// BIG(c1 * s) + ct[0]
module.vec_znx_big_add_small_inplace(&mut buf_big, 0, &ct, 0);
// m + e <- BIG(ct[1] * s + ct[0])
let mut res = module.new_vec_znx(1, ct_size);
module.vec_znx_big_normalize(log_base2k, &mut res, 0, &buf_big, 0, scratch);
module.vec_znx_big_normalize(log_base2k, &mut res, 0, &buf_big, 0, scratch.borrow());
// have = m * 2^{log_scale} + e
let mut have: Vec<i64> = vec![i64::default(); n];