mirror of
https://github.com/arnaucube/poulpy.git
synced 2026-02-10 21:26:41 +01:00
updated key-switch for rank switching & updated glwe key-switching test
This commit is contained in:
Jean-Philippe Bossuat
@@ -13,7 +13,7 @@ use crate::{
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glwe_plaintext::GLWEPlaintext,
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keys::{GLWEPublicKey, SecretKey, SecretKeyFourier},
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keyswitch_key::GLWESwitchingKey,
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test_fft64::{gglwe::noise_grlwe_rlwe_product, ggsw::noise_rgsw_product},
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test_fft64::{gglwe::noise_gglwe_product, ggsw::noise_rgsw_product},
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};
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#[test]
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@@ -197,21 +197,32 @@ fn test_encrypt_pk(log_n: usize, basek: usize, k_ct: usize, k_pk: usize, sigma:
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#[test]
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fn keyswitch() {
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let module: Module<FFT64> = Module::<FFT64>::new(2048);
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let basek: usize = 12;
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let log_k_grlwe: usize = 60;
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let log_k_rlwe_in: usize = 45;
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let log_k_rlwe_out: usize = 60;
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let rows: usize = (log_k_rlwe_in + basek - 1) / basek;
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let rank: usize = 1;
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(1..4).for_each(|rank_in| {
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(1..4).for_each(|rank_out| {
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println!("test keyswitch rank_in: {} rank_out: {}", rank_in, rank_out);
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test_keyswitch(12, 12, 60, 45, 60, rank_in, rank_out, 3.2);
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});
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});
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}
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let sigma: f64 = 3.2;
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fn test_keyswitch(
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log_n: usize,
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basek: usize,
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k_keyswitch: usize,
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k_ct_in: usize,
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k_ct_out: usize,
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rank_in: usize,
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rank_out: usize,
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sigma: f64,
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) {
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let module: Module<FFT64> = Module::<FFT64>::new(1 << log_n);
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let rows: usize = (k_ct_in + basek - 1) / basek;
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let mut ct_grlwe: GLWESwitchingKey<Vec<u8>, FFT64> = GLWESwitchingKey::new(&module, basek, log_k_grlwe, rows, rank, rank);
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let mut ct_rlwe_in: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, basek, log_k_rlwe_in, rank);
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let mut ct_rlwe_out: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, basek, log_k_rlwe_out, rank);
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let mut pt_want: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, basek, log_k_rlwe_in);
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let mut pt_have: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, basek, log_k_rlwe_out);
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let mut ksk: GLWESwitchingKey<Vec<u8>, FFT64> = GLWESwitchingKey::new(&module, basek, k_keyswitch, rows, rank_in, rank_out);
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let mut ct_in: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, basek, k_ct_in, rank_in);
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let mut ct_out: GLWECiphertext<Vec<u8>> = GLWECiphertext::new(&module, basek, k_ct_out, rank_out);
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let mut pt_want: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, basek, k_ct_in);
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let mut pt_have: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::new(&module, basek, k_ct_out);
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let mut source_xs: Source = Source::new([0u8; 32]);
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let mut source_xe: Source = Source::new([0u8; 32]);
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@@ -223,57 +234,59 @@ fn keyswitch() {
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.fill_uniform(basek, 0, pt_want.size(), &mut source_xa);
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let mut scratch: ScratchOwned = ScratchOwned::new(
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GLWESwitchingKey::encrypt_sk_scratch_space(&module, rank, ct_grlwe.size())
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| GLWECiphertext::decrypt_scratch_space(&module, ct_rlwe_out.size())
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| GLWECiphertext::encrypt_sk_scratch_space(&module, rank, ct_rlwe_in.size())
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GLWESwitchingKey::encrypt_sk_scratch_space(&module, rank_in, ksk.size())
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| GLWECiphertext::decrypt_scratch_space(&module, ct_out.size())
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| GLWECiphertext::encrypt_sk_scratch_space(&module, rank_out, ct_in.size())
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| GLWECiphertext::keyswitch_scratch_space(
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&module,
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ct_rlwe_out.size(),
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ct_rlwe_in.size(),
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ct_grlwe.size(),
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ct_out.size(),
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ct_in.size(),
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ksk.size(),
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rank_in,
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rank_out,
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),
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);
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let mut sk0: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
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sk0.fill_ternary_prob(0.5, &mut source_xs);
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let mut sk_in: SecretKey<Vec<u8>> = SecretKey::new(&module, rank_in);
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sk_in.fill_ternary_prob(0.5, &mut source_xs);
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let mut sk0_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank);
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sk0_dft.dft(&module, &sk0);
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let mut sk_in_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank_in);
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sk_in_dft.dft(&module, &sk_in);
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let mut sk1: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
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sk1.fill_ternary_prob(0.5, &mut source_xs);
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let mut sk_out: SecretKey<Vec<u8>> = SecretKey::new(&module, rank_out);
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sk_out.fill_ternary_prob(0.5, &mut source_xs);
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let mut sk1_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank);
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sk1_dft.dft(&module, &sk1);
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let mut sk_out_dft: SecretKeyFourier<Vec<u8>, FFT64> = SecretKeyFourier::new(&module, rank_out);
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sk_out_dft.dft(&module, &sk_out);
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ct_grlwe.encrypt_sk(
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ksk.encrypt_sk(
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&module,
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&sk0.data,
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&sk1_dft,
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&sk_in,
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&sk_out_dft,
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&mut source_xa,
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&mut source_xe,
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sigma,
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scratch.borrow(),
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);
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ct_rlwe_in.encrypt_sk(
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ct_in.encrypt_sk(
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&module,
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&pt_want,
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&sk0_dft,
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&sk_in_dft,
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&mut source_xa,
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&mut source_xe,
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sigma,
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scratch.borrow(),
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);
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ct_rlwe_out.keyswitch(&module, &ct_rlwe_in, &ct_grlwe, scratch.borrow());
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ct_out.keyswitch(&module, &ct_in, &ksk, scratch.borrow());
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ct_rlwe_out.decrypt(&module, &mut pt_have, &sk1_dft, scratch.borrow());
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ct_out.decrypt(&module, &mut pt_have, &sk_out_dft, scratch.borrow());
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module.vec_znx_sub_ab_inplace(&mut pt_have, 0, &pt_want, 0);
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let noise_have: f64 = pt_have.data.std(0, basek).log2();
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let noise_want: f64 = noise_grlwe_rlwe_product(
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let noise_want: f64 = noise_gglwe_product(
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module.n() as f64,
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basek,
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0.5,
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@@ -281,8 +294,9 @@ fn keyswitch() {
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0f64,
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sigma * sigma,
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0f64,
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log_k_rlwe_in,
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log_k_grlwe,
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rank_in as f64,
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k_ct_in,
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k_keyswitch,
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);
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assert!(
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@@ -322,7 +336,7 @@ fn keyswich_inplace() {
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GLWESwitchingKey::encrypt_sk_scratch_space(&module, rank, ct_grlwe.size())
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| GLWECiphertext::decrypt_scratch_space(&module, ct_rlwe.size())
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| GLWECiphertext::encrypt_sk_scratch_space(&module, rank, ct_rlwe.size())
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| GLWECiphertext::keyswitch_inplace_scratch_space(&module, ct_rlwe.size(), ct_grlwe.size()),
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| GLWECiphertext::keyswitch_inplace_scratch_space(&module, ct_rlwe.size(), ct_grlwe.size(), rank),
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);
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let mut sk0: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
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@@ -339,7 +353,7 @@ fn keyswich_inplace() {
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ct_grlwe.encrypt_sk(
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&module,
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&sk0.data,
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&sk0,
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&sk1_dft,
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&mut source_xa,
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&mut source_xe,
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@@ -364,7 +378,7 @@ fn keyswich_inplace() {
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module.vec_znx_sub_ab_inplace(&mut pt_have, 0, &pt_want, 0);
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let noise_have: f64 = pt_have.data.std(0, basek).log2();
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let noise_want: f64 = noise_grlwe_rlwe_product(
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let noise_want: f64 = noise_gglwe_product(
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module.n() as f64,
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basek,
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0.5,
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@@ -372,6 +386,7 @@ fn keyswich_inplace() {
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0f64,
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sigma * sigma,
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0f64,
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rank as f64,
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log_k_rlwe,
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log_k_grlwe,
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);
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@@ -427,6 +442,7 @@ fn external_product() {
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ct_rlwe_out.size(),
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ct_rlwe_in.size(),
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ct_rgsw.size(),
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rank,
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),
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);
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@@ -531,7 +547,7 @@ fn external_product_inplace() {
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GGSWCiphertext::encrypt_sk_scratch_space(&module, rank, ct_rgsw.size())
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| GLWECiphertext::decrypt_scratch_space(&module, ct_rlwe.size())
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| GLWECiphertext::encrypt_sk_scratch_space(&module, rank, ct_rlwe.size())
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| GLWECiphertext::external_product_inplace_scratch_space(&module, ct_rlwe.size(), ct_rgsw.size()),
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| GLWECiphertext::external_product_inplace_scratch_space(&module, ct_rlwe.size(), ct_rgsw.size(), rank),
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);
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let mut sk: SecretKey<Vec<u8>> = SecretKey::new(&module, rank);
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