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fixed sampling & rlwe encryption

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This commit is contained in:
Jean-Philippe Bossuat
2025-02-12 08:25:38 +01:00
parent 4a01bb8420
commit 1f52a3d266
6 changed files with 60 additions and 36 deletions
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23
rlwe/src/encryptor.rs
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@@ -145,28 +145,35 @@ pub fn encrypt_rlwe_sk_thread_safe(
// c1 <- Z_{2^prec}[X]/(X^{N}+1)
c1.fill_uniform(log_base2k, limbs, source_xa);
let bytes_of_vec_znx_dft = module.bytes_of_vec_znx_dft(limbs);
let bytes_of_vec_znx_dft: usize = module.bytes_of_vec_znx_dft(limbs);
// Scratch space for DFT values
let mut buf_dft: VecZnxDft =
VecZnxDft::from_bytes(limbs, &mut tmp_bytes[..bytes_of_vec_znx_dft]);
// Applies buf_dft <- s * c1
// Applies buf_dft <- DFT(s) * DFT(c1)
module.svp_apply_dft(&mut buf_dft, sk, c1, limbs);
// Alias scratch space
let mut buf_big: VecZnxBig = buf_dft.as_vec_znx_big();
if let Some(pt) = pt {
// buf_big <- m - buf_big
module.vec_znx_big_sub_small_a_inplace(&mut buf_big, pt.at(0));
};
// buf_big = s x c1
module.vec_znx_idft_tmp_a(&mut buf_big, &mut buf_dft, limbs);
let carry: &mut [u8] = &mut tmp_bytes[bytes_of_vec_znx_dft..];
// c0 <- normalize(buf_big) + e
// c0 <- -s x c1 + m
let c0: &mut VecZnx = ct.at_mut(0);
module.vec_znx_big_normalize(log_base2k, c0, &buf_big, carry);
if let Some(pt) = pt {
module.vec_znx_big_sub_small_a_inplace(&mut buf_big, pt.at(0));
module.vec_znx_big_normalize(log_base2k, c0, &buf_big, carry);
} else {
module.vec_znx_big_normalize(log_base2k, c0, &buf_big, carry);
module.vec_znx_negate_inplace(c0);
}
// c0 <- -s x c1 + m + e
c0.add_normal(log_base2k, log_q, source_xe, sigma, (sigma * 6.0).ceil());
}