Files
poulpy/core/src/test_fft64/glwe.rs
2025-05-14 08:42:45 +02:00

618 lines
19 KiB
Rust

use base2k::{
Decoding, Encoding, FFT64, FillUniform, Module, ScalarZnx, ScalarZnxAlloc, ScratchOwned, Stats, VecZnxOps, VecZnxToMut,
ZnxViewMut, ZnxZero,
};
use itertools::izip;
use sampling::source::Source;
use crate::{
elem::Infos,
ggsw_ciphertext::GGSWCiphertext,
glwe_ciphertext::GLWECiphertext,
glwe_ciphertext_fourier::GLWECiphertextFourier,
glwe_plaintext::GLWEPlaintext,
keys::{GLWEPublicKey, SecretKey, SecretKeyFourier},
keyswitch_key::GLWESwitchingKey,
test_fft64::{gglwe::noise_grlwe_rlwe_product, ggsw::noise_rgsw_product},
};
#[test]
fn encrypt_sk() {
let module: Module<FFT64> = Module::<FFT64>::new(32);
let log_base2k: usize = 8;
let log_k_ct: usize = 54;
let log_k_pt: usize = 30;
let rank: usize = 1;
let sigma: f64 = 3.2;
let bound: f64 = sigma * 6.0;
let mut ct: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, log_base2k, log_k_ct, rank);
let mut pt: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, log_base2k, log_k_pt);
let mut source_xs: Source = Source::new([0u8; 32]);
let mut source_xe: Source = Source::new([0u8; 32]);
let mut source_xa: Source = Source::new([0u8; 32]);
let mut scratch: ScratchOwned = ScratchOwned::new(
GLWECiphertext::encrypt_sk_scratch_space(&module, rank, ct.size())
| GLWECiphertext::decrypt_scratch_space(&module, ct.size()),
);
let mut sk: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
sk.fill_ternary_prob(0.5, &mut source_xs);
let mut sk_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank);
sk_dft.dft(&module, &sk);
let mut data_want: Vec<i64> = vec![0i64; module.n()];
data_want
.iter_mut()
.for_each(|x| *x = source_xa.next_i64() & 0xFF);
pt.data
.encode_vec_i64(0, log_base2k, log_k_pt, &data_want, 10);
ct.encrypt_sk(
&module,
&pt,
&sk_dft,
&mut source_xa,
&mut source_xe,
sigma,
bound,
scratch.borrow(),
);
pt.data.zero();
ct.decrypt(&module, &mut pt, &sk_dft, scratch.borrow());
let mut data_have: Vec<i64> = vec![0i64; module.n()];
pt.data
.decode_vec_i64(0, log_base2k, pt.size() * log_base2k, &mut data_have);
// TODO: properly assert the decryption noise through std(dec(ct) - pt)
let scale: f64 = (1 << (pt.size() * log_base2k - log_k_pt)) as f64;
izip!(data_want.iter(), data_have.iter()).for_each(|(a, b)| {
let b_scaled = (*b as f64) / scale;
assert!(
(*a as f64 - b_scaled).abs() < 0.1,
"{} {}",
*a as f64,
b_scaled
)
});
}
#[test]
fn encrypt_zero_sk() {
let module: Module<FFT64> = Module::<FFT64>::new(1024);
let log_base2k: usize = 8;
let log_k_ct: usize = 55;
let rank: usize = 1;
let sigma: f64 = 3.2;
let bound: f64 = sigma * 6.0;
let mut pt: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, log_base2k, log_k_ct);
let mut source_xs: Source = Source::new([0u8; 32]);
let mut source_xe: Source = Source::new([1u8; 32]);
let mut source_xa: Source = Source::new([0u8; 32]);
let mut sk: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
sk.fill_ternary_prob(0.5, &mut source_xs);
let mut sk_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank);
sk_dft.dft(&module, &sk);
let mut ct_dft: GLWECiphertextFourier<Vec<u8>, FFT64> = GLWECiphertextFourier::new(&module, log_base2k, log_k_ct, rank);
let mut scratch: ScratchOwned = ScratchOwned::new(
GLWECiphertextFourier::decrypt_scratch_space(&module, ct_dft.size())
| GLWECiphertextFourier::encrypt_sk_scratch_space(&module, rank, ct_dft.size()),
);
ct_dft.encrypt_zero_sk(
&module,
&sk_dft,
&mut source_xa,
&mut source_xe,
sigma,
bound,
scratch.borrow(),
);
ct_dft.decrypt(&module, &mut pt, &sk_dft, scratch.borrow());
assert!((sigma - pt.data.std(0, log_base2k) * (log_k_ct as f64).exp2()) <= 0.2);
}
#[test]
fn encrypt_pk() {
let module: Module<FFT64> = Module::<FFT64>::new(32);
let log_base2k: usize = 8;
let log_k_ct: usize = 54;
let log_k_pk: usize = 64;
let rank: usize = 1;
let sigma: f64 = 3.2;
let bound: f64 = sigma * 6.0;
let mut ct: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, log_base2k, log_k_ct, rank);
let mut pt_want: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, log_base2k, log_k_ct);
let mut source_xs: Source = Source::new([0u8; 32]);
let mut source_xe: Source = Source::new([0u8; 32]);
let mut source_xa: Source = Source::new([0u8; 32]);
let mut source_xu: Source = Source::new([0u8; 32]);
let mut sk: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
sk.fill_ternary_prob(0.5, &mut source_xs);
let mut sk_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank);
sk_dft.dft(&module, &sk);
let mut pk: GLWEPublicKey<Vec<u8>, FFT64> = GLWEPublicKey::new(&module, log_base2k, log_k_pk, rank);
pk.generate(
&module,
&sk_dft,
&mut source_xa,
&mut source_xe,
sigma,
bound,
);
let mut scratch: ScratchOwned = ScratchOwned::new(
GLWECiphertext::encrypt_sk_scratch_space(&module, rank, ct.size())
| GLWECiphertext::decrypt_scratch_space(&module, ct.size())
| GLWECiphertext::encrypt_pk_scratch_space(&module, rank, pk.size()),
);
let mut data_want: Vec<i64> = vec![0i64; module.n()];
data_want
.iter_mut()
.for_each(|x| *x = source_xa.next_i64() & 0);
pt_want
.data
.encode_vec_i64(0, log_base2k, log_k_ct, &data_want, 10);
ct.encrypt_pk(
&module,
&pt_want,
&pk,
&mut source_xu,
&mut source_xe,
sigma,
bound,
scratch.borrow(),
);
let mut pt_have: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, log_base2k, log_k_ct);
ct.decrypt(&module, &mut pt_have, &sk_dft, scratch.borrow());
module.vec_znx_sub_ab_inplace(&mut pt_want, 0, &pt_have, 0);
assert!(((1.0f64 / 12.0).sqrt() - pt_want.data.std(0, log_base2k) * (log_k_ct as f64).exp2()).abs() < 0.2);
}
#[test]
fn keyswitch() {
let module: Module<FFT64> = Module::<FFT64>::new(2048);
let log_base2k: usize = 12;
let log_k_grlwe: usize = 60;
let log_k_rlwe_in: usize = 45;
let log_k_rlwe_out: usize = 60;
let rows: usize = (log_k_rlwe_in + log_base2k - 1) / log_base2k;
let rank: usize = 1;
let sigma: f64 = 3.2;
let bound: f64 = sigma * 6.0;
let mut ct_grlwe: GLWESwitchingKey<Vec<u8>, FFT64> =
GLWESwitchingKey::new(&module, log_base2k, log_k_grlwe, rows, rank, rank);
let mut ct_rlwe_in: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, log_base2k, log_k_rlwe_in, rank);
let mut ct_rlwe_out: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, log_base2k, log_k_rlwe_out, rank);
let mut pt_want: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, log_base2k, log_k_rlwe_in);
let mut pt_have: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, log_base2k, log_k_rlwe_out);
let mut source_xs: Source = Source::new([0u8; 32]);
let mut source_xe: Source = Source::new([0u8; 32]);
let mut source_xa: Source = Source::new([0u8; 32]);
// Random input plaintext
pt_want
.data
.fill_uniform(log_base2k, 0, pt_want.size(), &mut source_xa);
let mut scratch: ScratchOwned = ScratchOwned::new(
GLWESwitchingKey::encrypt_sk_scratch_space(&module, rank, ct_grlwe.size())
| GLWECiphertext::decrypt_scratch_space(&module, ct_rlwe_out.size())
| GLWECiphertext::encrypt_sk_scratch_space(&module, rank, ct_rlwe_in.size())
| GLWECiphertext::keyswitch_scratch_space(
&module,
ct_rlwe_out.size(),
ct_rlwe_in.size(),
ct_grlwe.size(),
),
);
let mut sk0: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
sk0.fill_ternary_prob(0.5, &mut source_xs);
let mut sk0_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank);
sk0_dft.dft(&module, &sk0);
let mut sk1: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
sk1.fill_ternary_prob(0.5, &mut source_xs);
let mut sk1_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank);
sk1_dft.dft(&module, &sk1);
ct_grlwe.encrypt_sk(
&module,
&sk0.data,
&sk1_dft,
&mut source_xa,
&mut source_xe,
sigma,
bound,
scratch.borrow(),
);
ct_rlwe_in.encrypt_sk(
&module,
&pt_want,
&sk0_dft,
&mut source_xa,
&mut source_xe,
sigma,
bound,
scratch.borrow(),
);
ct_rlwe_out.keyswitch(&module, &ct_rlwe_in, &ct_grlwe, scratch.borrow());
ct_rlwe_out.decrypt(&module, &mut pt_have, &sk1_dft, scratch.borrow());
module.vec_znx_sub_ab_inplace(&mut pt_have, 0, &pt_want, 0);
let noise_have: f64 = pt_have.data.std(0, log_base2k).log2();
let noise_want: f64 = noise_grlwe_rlwe_product(
module.n() as f64,
log_base2k,
0.5,
0.5,
0f64,
sigma * sigma,
0f64,
log_k_rlwe_in,
log_k_grlwe,
);
assert!(
(noise_have - noise_want).abs() <= 0.1,
"{} {}",
noise_have,
noise_want
);
}
#[test]
fn keyswich_inplace() {
let module: Module<FFT64> = Module::<FFT64>::new(2048);
let log_base2k: usize = 12;
let log_k_grlwe: usize = 60;
let log_k_rlwe: usize = 45;
let rows: usize = (log_k_rlwe + log_base2k - 1) / log_base2k;
let rank: usize = 1;
let sigma: f64 = 3.2;
let bound: f64 = sigma * 6.0;
let mut ct_grlwe: GLWESwitchingKey<Vec<u8>, FFT64> =
GLWESwitchingKey::new(&module, log_base2k, log_k_grlwe, rows, rank, rank);
let mut ct_rlwe: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, log_base2k, log_k_rlwe, rank);
let mut pt_want: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, log_base2k, log_k_rlwe);
let mut pt_have: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, log_base2k, log_k_rlwe);
let mut source_xs: Source = Source::new([0u8; 32]);
let mut source_xe: Source = Source::new([0u8; 32]);
let mut source_xa: Source = Source::new([0u8; 32]);
// Random input plaintext
pt_want
.data
.fill_uniform(log_base2k, 0, pt_want.size(), &mut source_xa);
let mut scratch: ScratchOwned = ScratchOwned::new(
GLWESwitchingKey::encrypt_sk_scratch_space(&module, rank, ct_grlwe.size())
| GLWECiphertext::decrypt_scratch_space(&module, ct_rlwe.size())
| GLWECiphertext::encrypt_sk_scratch_space(&module, rank, ct_rlwe.size())
| GLWECiphertext::keyswitch_inplace_scratch_space(&module, ct_rlwe.size(), ct_grlwe.size()),
);
let mut sk0: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
sk0.fill_ternary_prob(0.5, &mut source_xs);
let mut sk0_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank);
sk0_dft.dft(&module, &sk0);
let mut sk1: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
sk1.fill_ternary_prob(0.5, &mut source_xs);
let mut sk1_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank);
sk1_dft.dft(&module, &sk1);
ct_grlwe.encrypt_sk(
&module,
&sk0.data,
&sk1_dft,
&mut source_xa,
&mut source_xe,
sigma,
bound,
scratch.borrow(),
);
ct_rlwe.encrypt_sk(
&module,
&pt_want,
&sk0_dft,
&mut source_xa,
&mut source_xe,
sigma,
bound,
scratch.borrow(),
);
ct_rlwe.keyswitch_inplace(&module, &ct_grlwe, scratch.borrow());
ct_rlwe.decrypt(&module, &mut pt_have, &sk1_dft, scratch.borrow());
module.vec_znx_sub_ab_inplace(&mut pt_have, 0, &pt_want, 0);
let noise_have: f64 = pt_have.data.std(0, log_base2k).log2();
let noise_want: f64 = noise_grlwe_rlwe_product(
module.n() as f64,
log_base2k,
0.5,
0.5,
0f64,
sigma * sigma,
0f64,
log_k_rlwe,
log_k_grlwe,
);
assert!(
(noise_have - noise_want).abs() <= 0.1,
"{} {}",
noise_have,
noise_want
);
}
#[test]
fn external_product() {
let module: Module<FFT64> = Module::<FFT64>::new(2048);
let log_base2k: usize = 12;
let log_k_grlwe: usize = 60;
let log_k_rlwe_in: usize = 45;
let log_k_rlwe_out: usize = 60;
let rows: usize = (log_k_rlwe_in + log_base2k - 1) / log_base2k;
let rank: usize = 1;
let sigma: f64 = 3.2;
let bound: f64 = sigma * 6.0;
let mut ct_rgsw: GGSWCiphertext<Vec<u8>, FFT64> = GGSWCiphertext::new(&module, log_base2k, log_k_grlwe, rows, rank);
let mut ct_rlwe_in: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, log_base2k, log_k_rlwe_in, rank);
let mut ct_rlwe_out: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, log_base2k, log_k_rlwe_out, rank);
let mut pt_rgsw: ScalarZnx<Vec<u8>> = module.new_scalar_znx(1);
let mut pt_want: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, log_base2k, log_k_rlwe_in);
let mut pt_have: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, log_base2k, log_k_rlwe_out);
let mut source_xs: Source = Source::new([0u8; 32]);
let mut source_xe: Source = Source::new([0u8; 32]);
let mut source_xa: Source = Source::new([0u8; 32]);
// Random input plaintext
pt_want
.data
.fill_uniform(log_base2k, 0, pt_want.size(), &mut source_xa);
pt_want.to_mut().at_mut(0, 0)[1] = 1;
let k: usize = 1;
pt_rgsw.raw_mut()[k] = 1; // X^{k}
let mut scratch: ScratchOwned = ScratchOwned::new(
GGSWCiphertext::encrypt_sk_scratch_space(&module, rank, ct_rgsw.size())
| GLWECiphertext::decrypt_scratch_space(&module, ct_rlwe_out.size())
| GLWECiphertext::encrypt_sk_scratch_space(&module, rank, ct_rlwe_in.size())
| GLWECiphertext::external_product_scratch_space(
&module,
ct_rlwe_out.size(),
ct_rlwe_in.size(),
ct_rgsw.size(),
),
);
let mut sk: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
sk.fill_ternary_prob(0.5, &mut source_xs);
let mut sk_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank);
sk_dft.dft(&module, &sk);
ct_rgsw.encrypt_sk(
&module,
&pt_rgsw,
&sk_dft,
&mut source_xa,
&mut source_xe,
sigma,
bound,
scratch.borrow(),
);
ct_rlwe_in.encrypt_sk(
&module,
&pt_want,
&sk_dft,
&mut source_xa,
&mut source_xe,
sigma,
bound,
scratch.borrow(),
);
ct_rlwe_out.external_product(&module, &ct_rlwe_in, &ct_rgsw, scratch.borrow());
ct_rlwe_out.decrypt(&module, &mut pt_have, &sk_dft, scratch.borrow());
module.vec_znx_rotate_inplace(k as i64, &mut pt_want, 0);
module.vec_znx_sub_ab_inplace(&mut pt_have, 0, &pt_want, 0);
let noise_have: f64 = pt_have.data.std(0, log_base2k).log2();
let var_gct_err_lhs: f64 = sigma * sigma;
let var_gct_err_rhs: f64 = 0f64;
let var_msg: f64 = 1f64 / module.n() as f64; // X^{k}
let var_a0_err: f64 = sigma * sigma;
let var_a1_err: f64 = 1f64 / 12f64;
let noise_want: f64 = noise_rgsw_product(
module.n() as f64,
log_base2k,
0.5,
var_msg,
var_a0_err,
var_a1_err,
var_gct_err_lhs,
var_gct_err_rhs,
log_k_rlwe_in,
log_k_grlwe,
);
assert!(
(noise_have - noise_want).abs() <= 0.1,
"{} {}",
noise_have,
noise_want
);
}
#[test]
fn external_product_inplace() {
let module: Module<FFT64> = Module::<FFT64>::new(2048);
let log_base2k: usize = 12;
let log_k_grlwe: usize = 60;
let log_k_rlwe_in: usize = 45;
let log_k_rlwe_out: usize = 60;
let rows: usize = (log_k_rlwe_in + log_base2k - 1) / log_base2k;
let rank: usize = 1;
let sigma: f64 = 3.2;
let bound: f64 = sigma * 6.0;
let mut ct_rgsw: GGSWCiphertext<Vec<u8>, FFT64> = GGSWCiphertext::new(&module, log_base2k, log_k_grlwe, rows, rank);
let mut ct_rlwe: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, log_base2k, log_k_rlwe_in, rank);
let mut pt_rgsw: ScalarZnx<Vec<u8>> = module.new_scalar_znx(1);
let mut pt_want: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, log_base2k, log_k_rlwe_in);
let mut pt_have: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, log_base2k, log_k_rlwe_out);
let mut source_xs: Source = Source::new([0u8; 32]);
let mut source_xe: Source = Source::new([0u8; 32]);
let mut source_xa: Source = Source::new([0u8; 32]);
// Random input plaintext
pt_want
.data
.fill_uniform(log_base2k, 0, pt_want.size(), &mut source_xa);
pt_want.to_mut().at_mut(0, 0)[1] = 1;
let k: usize = 1;
pt_rgsw.raw_mut()[k] = 1; // X^{k}
let mut scratch: ScratchOwned = ScratchOwned::new(
GGSWCiphertext::encrypt_sk_scratch_space(&module, rank, ct_rgsw.size())
| GLWECiphertext::decrypt_scratch_space(&module, ct_rlwe.size())
| GLWECiphertext::encrypt_sk_scratch_space(&module, rank, ct_rlwe.size())
| GLWECiphertext::external_product_inplace_scratch_space(&module, ct_rlwe.size(), ct_rgsw.size()),
);
let mut sk: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
sk.fill_ternary_prob(0.5, &mut source_xs);
let mut sk_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank);
sk_dft.dft(&module, &sk);
ct_rgsw.encrypt_sk(
&module,
&pt_rgsw,
&sk_dft,
&mut source_xa,
&mut source_xe,
sigma,
bound,
scratch.borrow(),
);
ct_rlwe.encrypt_sk(
&module,
&pt_want,
&sk_dft,
&mut source_xa,
&mut source_xe,
sigma,
bound,
scratch.borrow(),
);
ct_rlwe.external_product_inplace(&module, &ct_rgsw, scratch.borrow());
ct_rlwe.decrypt(&module, &mut pt_have, &sk_dft, scratch.borrow());
module.vec_znx_rotate_inplace(k as i64, &mut pt_want, 0);
module.vec_znx_sub_ab_inplace(&mut pt_have, 0, &pt_want, 0);
let noise_have: f64 = pt_have.data.std(0, log_base2k).log2();
let var_gct_err_lhs: f64 = sigma * sigma;
let var_gct_err_rhs: f64 = 0f64;
let var_msg: f64 = 1f64 / module.n() as f64; // X^{k}
let var_a0_err: f64 = sigma * sigma;
let var_a1_err: f64 = 1f64 / 12f64;
let noise_want: f64 = noise_rgsw_product(
module.n() as f64,
log_base2k,
0.5,
var_msg,
var_a0_err,
var_a1_err,
var_gct_err_lhs,
var_gct_err_rhs,
log_k_rlwe_in,
log_k_grlwe,
);
assert!(
(noise_have - noise_want).abs() <= 0.1,
"{} {}",
noise_have,
noise_want
);
}