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vmp & svp doc

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This commit is contained in:
Jean-Philippe Bossuat
2025-02-04 10:51:11 +01:00
parent 12004c426a
commit e4a976ec9e
11 changed files with 759 additions and 500 deletions
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25
base2k/examples/rlwe_encrypt.rs
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@@ -6,7 +6,8 @@ fn main() {
let n: usize = 16;
let log_base2k: usize = 18;
let limbs: usize = 3;
let log_scale: usize = (limbs - 1) * log_base2k - 5;
let msg_limbs: usize = 2;
let log_scale: usize = msg_limbs * log_base2k - 5;
let module: Module = Module::new::<FFT64>(n);
let mut carry: Vec<u8> = vec![0; module.vec_znx_big_normalize_tmp_bytes()];
@@ -14,7 +15,7 @@ fn main() {
let seed: [u8; 32] = [0; 32];
let mut source: Source = Source::new(seed);
let mut res: VecZnx = VecZnx::new(n, log_base2k, limbs);
let mut res: VecZnx = module.new_vec_znx(limbs);
// s <- Z_{-1, 0, 1}[X]/(X^{N}+1)
let mut s: Scalar = Scalar::new(n);
@@ -27,8 +28,8 @@ fn main() {
module.svp_prepare(&mut s_ppol, &s);
// a <- Z_{2^prec}[X]/(X^{N}+1)
let mut a: VecZnx = VecZnx::new(n, log_base2k, limbs);
a.fill_uniform(&mut source, log_base2k * limbs);
let mut a: VecZnx = module.new_vec_znx(limbs);
a.fill_uniform(log_base2k, &mut source, limbs);
// Scratch space for DFT values
let mut buf_dft: VecZnxDft = module.new_vec_znx_dft(a.limbs());
@@ -42,23 +43,23 @@ fn main() {
// buf_big <- IDFT(buf_dft) (not normalized)
module.vec_znx_idft_tmp_a(&mut buf_big, &mut buf_dft, a.limbs());
let mut m: VecZnx = VecZnx::new(n, log_base2k, 2);
let mut m: VecZnx = module.new_vec_znx(msg_limbs);
let mut want: Vec<i64> = vec![0; n];
want.iter_mut()
.for_each(|x| *x = source.next_u64n(16, 15) as i64);
// m
m.from_i64(&want, 4, log_scale);
m.normalize(&mut carry);
m.from_i64(log_base2k, &want, 4, log_scale);
m.normalize(log_base2k, &mut carry);
// buf_big <- m - buf_big
module.vec_znx_big_sub_small_a_inplace(&mut buf_big, &m);
// b <- normalize(buf_big) + e
let mut b: VecZnx = VecZnx::new(n, log_base2k, limbs);
module.vec_znx_big_normalize(&mut b, &buf_big, &mut carry);
b.add_normal(&mut source, 3.2, 19.0, log_base2k * limbs);
let mut b: VecZnx = module.new_vec_znx(limbs);
module.vec_znx_big_normalize(log_base2k, &mut b, &buf_big, &mut carry);
b.add_normal(log_base2k, &mut source, 3.2, 19.0, log_base2k * limbs);
//Decrypt
@@ -70,11 +71,11 @@ fn main() {
module.vec_znx_big_add_small_inplace(&mut buf_big, &b);
// res <- normalize(buf_big)
module.vec_znx_big_normalize(&mut res, &buf_big, &mut carry);
module.vec_znx_big_normalize(log_base2k, &mut res, &buf_big, &mut carry);
// have = m * 2^{log_scale} + e
let mut have: Vec<i64> = vec![i64::default(); n];
res.to_i64(&mut have, res.limbs() * log_base2k);
res.to_i64(log_base2k, &mut have, res.limbs() * log_base2k);
let scale: f64 = (1 << (res.limbs() * log_base2k - log_scale)) as f64;
izip!(want.iter(), have.iter())