Re-organized code for glwe testing

core/src/glwe/test_fft64/encryption.rs

@@ -0,0 +1,180 @@
+use backend::{Decoding, Encoding, FFT64, Module, ScratchOwned, Stats, VecZnxOps, ZnxZero};
+use itertools::izip;
+use sampling::source::Source;
+
+use crate::{FourierGLWECiphertext, GLWECiphertext, GLWEPlaintext, GLWEPublicKey, GLWESecret, Infos};
+
+#[test]
+fn encrypt_sk() {
+    let log_n: usize = 8;
+    (1..4).for_each(|rank| {
+        println!("test encrypt_sk rank: {}", rank);
+        test_encrypt_sk(log_n, 8, 54, 30, 3.2, rank);
+    });
+}
+
+#[test]
+fn encrypt_zero_sk() {
+    let log_n: usize = 8;
+    (1..4).for_each(|rank| {
+        println!("test encrypt_zero_sk rank: {}", rank);
+        test_encrypt_zero_sk(log_n, 8, 64, 3.2, rank);
+    });
+}
+
+#[test]
+fn encrypt_pk() {
+    let log_n: usize = 8;
+    (1..4).for_each(|rank| {
+        println!("test encrypt_pk rank: {}", rank);
+        test_encrypt_pk(log_n, 8, 64, 64, 3.2, rank)
+    });
+}
+
+fn test_encrypt_sk(log_n: usize, basek: usize, k_ct: usize, k_pt: usize, sigma: f64, rank: usize) {
+    let module: Module<FFT64> = Module::<FFT64>::new(1 << log_n);
+
+    let mut ct: GLWECiphertext<Vec<u8>> = GLWECiphertext::alloc(&module, basek, k_ct, rank);
+    let mut pt: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::alloc(&module, basek, 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, basek, ct.k())
+            | GLWECiphertext::decrypt_scratch_space(&module, basek, ct.k()),
+    );
+
+    let mut sk: GLWESecret<Vec<u8>, FFT64> = GLWESecret::alloc(&module, rank);
+    sk.fill_ternary_prob(&module, 0.5, &mut source_xs);
+
+    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, basek, k_pt, &data_want, 10);
+
+    ct.encrypt_sk(
+        &module,
+        &pt,
+        &sk,
+        &mut source_xa,
+        &mut source_xe,
+        sigma,
+        scratch.borrow(),
+    );
+
+    pt.data.zero();
+
+    ct.decrypt(&module, &mut pt, &sk, scratch.borrow());
+
+    let mut data_have: Vec<i64> = vec![0i64; module.n()];
+
+    pt.data
+        .decode_vec_i64(0, basek, pt.size() * basek, &mut data_have);
+
+    // TODO: properly assert the decryption noise through std(dec(ct) - pt)
+    let scale: f64 = (1 << (pt.size() * basek - 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
+        )
+    });
+}
+
+fn test_encrypt_zero_sk(log_n: usize, basek: usize, k_ct: usize, sigma: f64, rank: usize) {
+    let module: Module<FFT64> = Module::<FFT64>::new(1 << log_n);
+
+    let mut pt: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::alloc(&module, basek, 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: GLWESecret<Vec<u8>, FFT64> = GLWESecret::alloc(&module, rank);
+    sk.fill_ternary_prob(&module, 0.5, &mut source_xs);
+
+    let mut ct_dft: FourierGLWECiphertext<Vec<u8>, FFT64> = FourierGLWECiphertext::alloc(&module, basek, k_ct, rank);
+
+    let mut scratch: ScratchOwned = ScratchOwned::new(
+        FourierGLWECiphertext::decrypt_scratch_space(&module, basek, k_ct)
+            | FourierGLWECiphertext::encrypt_sk_scratch_space(&module, basek, k_ct, rank),
+    );
+
+    ct_dft.encrypt_zero_sk(
+        &module,
+        &sk,
+        &mut source_xa,
+        &mut source_xe,
+        sigma,
+        scratch.borrow(),
+    );
+    ct_dft.decrypt(&module, &mut pt, &sk, scratch.borrow());
+
+    assert!((sigma - pt.data.std(0, basek) * (k_ct as f64).exp2()) <= 0.2);
+}
+
+fn test_encrypt_pk(log_n: usize, basek: usize, k_ct: usize, k_pk: usize, sigma: f64, rank: usize) {
+    let module: Module<FFT64> = Module::<FFT64>::new(1 << log_n);
+
+    let mut ct: GLWECiphertext<Vec<u8>> = GLWECiphertext::alloc(&module, basek, k_ct, rank);
+    let mut pt_want: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::alloc(&module, basek, 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: GLWESecret<Vec<u8>, FFT64> = GLWESecret::alloc(&module, rank);
+    sk.fill_ternary_prob(&module, 0.5, &mut source_xs);
+
+    let mut pk: GLWEPublicKey<Vec<u8>, FFT64> = GLWEPublicKey::alloc(&module, basek, k_pk, rank);
+    pk.generate_from_sk(&module, &sk, &mut source_xa, &mut source_xe, sigma);
+
+    let mut scratch: ScratchOwned = ScratchOwned::new(
+        GLWECiphertext::encrypt_sk_scratch_space(&module, basek, ct.k())
+            | GLWECiphertext::decrypt_scratch_space(&module, basek, ct.k())
+            | GLWECiphertext::encrypt_pk_scratch_space(&module, basek, pk.k()),
+    );
+
+    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, basek, k_ct, &data_want, 10);
+
+    ct.encrypt_pk(
+        &module,
+        &pt_want,
+        &pk,
+        &mut source_xu,
+        &mut source_xe,
+        sigma,
+        scratch.borrow(),
+    );
+
+    let mut pt_have: GLWEPlaintext<Vec<u8>> = GLWEPlaintext::alloc(&module, basek, k_ct);
+
+    ct.decrypt(&module, &mut pt_have, &sk, scratch.borrow());
+
+    module.vec_znx_sub_ab_inplace(&mut pt_want.data, 0, &pt_have.data, 0);
+
+    let noise_have: f64 = pt_want.data.std(0, basek).log2();
+    let noise_want: f64 = ((((rank as f64) + 1.0) * module.n() as f64 * 0.5 * sigma * sigma).sqrt()).log2() - (k_ct as f64);
+
+    assert!(
+        (noise_have - noise_want).abs() < 0.2,
+        "{} {}",
+        noise_have,
+        noise_want
+    );
+}