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fixed gadget product & related example

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This commit is contained in:
Jean-Philippe Bossuat
2025-02-12 16:49:53 +01:00
parent dc2fab9a04
commit 7c25ad2eba
10 changed files with 128 additions and 172 deletions
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22
rlwe/src/decryptor.rs
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@@ -1,5 +1,9 @@
use crate::{
ciphertext::{Ciphertext, GadgetCiphertext}, elem::Elem, keys::SecretKey, parameters::Parameters, plaintext::Plaintext
ciphertext::{Ciphertext, GadgetCiphertext},
elem::Elem,
keys::SecretKey,
parameters::Parameters,
plaintext::Plaintext,
};
use base2k::{Module, SvpPPol, SvpPPolOps, VecZnxDft};
use std::cmp::min;
@@ -46,26 +50,24 @@ pub fn decrypt_rlwe_thread_safe(
sk: &SvpPPol,
tmp_bytes: &mut [u8],
) {
let limbs: usize = min(res.limbs(), a.limbs());
assert!(
tmp_bytes.len() >= decrypt_rlwe_thread_safe_tmp_byte(module, limbs),
tmp_bytes.len() >= decrypt_rlwe_thread_safe_tmp_byte(module, a.limbs()),
"invalid tmp_bytes: tmp_bytes.len()={} < decrypt_rlwe_thread_safe_tmp_byte={}",
tmp_bytes.len(),
decrypt_rlwe_thread_safe_tmp_byte(module, limbs)
decrypt_rlwe_thread_safe_tmp_byte(module, a.limbs())
);
let res_dft_bytes: usize = module.bytes_of_vec_znx_dft(limbs);
let res_dft_bytes: usize = module.bytes_of_vec_znx_dft(a.limbs());
let mut res_dft: VecZnxDft = VecZnxDft::from_bytes(limbs, tmp_bytes);
let mut res_dft: VecZnxDft = VecZnxDft::from_bytes(a.limbs(), tmp_bytes);
let mut res_big: base2k::VecZnxBig = res_dft.as_vec_znx_big();
// res_dft <- DFT(ct[1]) * DFT(sk)
module.svp_apply_dft(&mut res_dft, sk, &a.value[1], limbs);
module.svp_apply_dft(&mut res_dft, sk, &a.value[1], a.limbs());
// res_big <- ct[1] x sk
module.vec_znx_idft_tmp_a(&mut res_big, &mut res_dft, limbs);
module.vec_znx_idft_tmp_a(&mut res_big, &mut res_dft, a.limbs());
// res_big <- ct[1] x sk + ct[0]
module.vec_znx_big_add_small_inplace(&mut res_big, &a.value[0], limbs);
module.vec_znx_big_add_small_inplace(&mut res_big, &a.value[0]);
// res <- normalize(ct[1] x sk + ct[0])
module.vec_znx_big_normalize(
a.log_base2k(),