poulpy-ckks 0.6.0

A backend-agnostic crate implementing the CKKS FHE scheme
Documentation 
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//! Multiplication and division by the imaginary unit.

use crate::{CKKSInfos, leveled::api::CKKSImagOps};

use super::helpers::{
    TestContextBackend, TestContextModule, TestScalar, alloc_ct, alloc_scratch, assert_ct_meta, assert_decrypt_precision,
    assert_unary_output_meta, ckks_encrypt, gen_sk, test_vector_1, want_div_i, want_mul_i,
};
use poulpy_hal::{
    api::{NegacyclicFFT, NegacyclicFFTNew, ScratchOwnedBorrow},
    layouts::{HostBytesBackend, Module},
};

use crate::{encoding::reim::Encoder, test_suite::CKKSTestParams};

pub fn test_mul_i_aligned<BE, F, E>(params: CKKSTestParams, module: &Module<BE>, host_module: &Module<HostBytesBackend>)
where
    BE: TestContextBackend,
    Module<BE>: TestContextModule<BE>,
    F: TestScalar,
    E: NegacyclicFFT<F> + NegacyclicFFTNew<F>,
{
    let m = params.n / 2;
    let encoder = Encoder::<E>::new(m).unwrap();
    let (re1, im1) = test_vector_1::<F>(m);
    let sk = gen_sk(&params, module, host_module, [0u8; 32]);
    let mut scratch = alloc_scratch(&params, module);

    let ct = ckks_encrypt(
        &params,
        module,
        host_module,
        &encoder,
        &sk,
        params.k,
        &re1,
        &im1,
        &mut scratch.borrow(),
    );
    let (want_re, want_im) = want_mul_i(&re1, &im1);
    let mut ct_res = alloc_ct(&params, module, params.k);
    module.ckks_mul_i_into(&mut ct_res, &ct, &mut scratch.borrow()).unwrap();
    assert_unary_output_meta("mul_i", &ct_res, &ct);
    assert_decrypt_precision(
        "mul_i",
        &params,
        module,
        &encoder,
        &ct_res,
        &sk,
        &want_re,
        &want_im,
        &mut scratch.borrow(),
    );
}

pub fn test_mul_i_smaller_output<BE, F, E>(params: CKKSTestParams, module: &Module<BE>, host_module: &Module<HostBytesBackend>)
where
    BE: TestContextBackend,
    Module<BE>: TestContextModule<BE>,
    F: TestScalar,
    E: NegacyclicFFT<F> + NegacyclicFFTNew<F>,
{
    let m = params.n / 2;
    let encoder = Encoder::<E>::new(m).unwrap();
    let (re1, im1) = test_vector_1::<F>(m);
    let sk = gen_sk(&params, module, host_module, [0u8; 32]);
    let mut scratch = alloc_scratch(&params, module);

    let ct = ckks_encrypt(
        &params,
        module,
        host_module,
        &encoder,
        &sk,
        params.k,
        &re1,
        &im1,
        &mut scratch.borrow(),
    );
    let (want_re, want_im) = want_mul_i(&re1, &im1);
    let mut ct_res = alloc_ct(&params, module, params.k - params.base2k - 1);
    module.ckks_mul_i_into(&mut ct_res, &ct, &mut scratch.borrow()).unwrap();
    assert_unary_output_meta("mul_i smaller_output", &ct_res, &ct);
    assert_decrypt_precision(
        "mul_i",
        &params,
        module,
        &encoder,
        &ct_res,
        &sk,
        &want_re,
        &want_im,
        &mut scratch.borrow(),
    );
}

pub fn test_mul_i_assign<BE, F, E>(params: CKKSTestParams, module: &Module<BE>, host_module: &Module<HostBytesBackend>)
where
    BE: TestContextBackend,
    Module<BE>: TestContextModule<BE>,
    F: TestScalar,
    E: NegacyclicFFT<F> + NegacyclicFFTNew<F>,
{
    let m = params.n / 2;
    let encoder = Encoder::<E>::new(m).unwrap();
    let (re1, im1) = test_vector_1::<F>(m);
    let sk = gen_sk(&params, module, host_module, [0u8; 32]);
    let mut scratch = alloc_scratch(&params, module);

    let mut ct = ckks_encrypt(
        &params,
        module,
        host_module,
        &encoder,
        &sk,
        params.k,
        &re1,
        &im1,
        &mut scratch.borrow(),
    );
    let (want_re, want_im) = want_mul_i(&re1, &im1);
    let expected_log_delta = ct.log_delta();
    let expected_log_budget = ct.log_budget();
    module.ckks_mul_i_assign(&mut ct, &mut scratch.borrow()).unwrap();
    assert_ct_meta("mul_i_assign", &ct, expected_log_delta, expected_log_budget);
    assert_decrypt_precision(
        "mul_i_assign",
        &params,
        module,
        &encoder,
        &ct,
        &sk,
        &want_re,
        &want_im,
        &mut scratch.borrow(),
    );
}

pub fn test_div_i_aligned<BE, F, E>(params: CKKSTestParams, module: &Module<BE>, host_module: &Module<HostBytesBackend>)
where
    BE: TestContextBackend,
    Module<BE>: TestContextModule<BE>,
    F: TestScalar,
    E: NegacyclicFFT<F> + NegacyclicFFTNew<F>,
{
    let m = params.n / 2;
    let encoder = Encoder::<E>::new(m).unwrap();
    let (re1, im1) = test_vector_1::<F>(m);
    let sk = gen_sk(&params, module, host_module, [0u8; 32]);
    let mut scratch = alloc_scratch(&params, module);

    let ct = ckks_encrypt(
        &params,
        module,
        host_module,
        &encoder,
        &sk,
        params.k,
        &re1,
        &im1,
        &mut scratch.borrow(),
    );
    let (want_re, want_im) = want_div_i(&re1, &im1);
    let mut ct_res = alloc_ct(&params, module, params.k);
    module.ckks_div_i_into(&mut ct_res, &ct, &mut scratch.borrow()).unwrap();
    assert_unary_output_meta("div_i", &ct_res, &ct);
    assert_decrypt_precision(
        "div_i",
        &params,
        module,
        &encoder,
        &ct_res,
        &sk,
        &want_re,
        &want_im,
        &mut scratch.borrow(),
    );
}

pub fn test_div_i_smaller_output<BE, F, E>(params: CKKSTestParams, module: &Module<BE>, host_module: &Module<HostBytesBackend>)
where
    BE: TestContextBackend,
    Module<BE>: TestContextModule<BE>,
    F: TestScalar,
    E: NegacyclicFFT<F> + NegacyclicFFTNew<F>,
{
    let m = params.n / 2;
    let encoder = Encoder::<E>::new(m).unwrap();
    let (re1, im1) = test_vector_1::<F>(m);
    let sk = gen_sk(&params, module, host_module, [0u8; 32]);
    let mut scratch = alloc_scratch(&params, module);

    let ct = ckks_encrypt(
        &params,
        module,
        host_module,
        &encoder,
        &sk,
        params.k,
        &re1,
        &im1,
        &mut scratch.borrow(),
    );
    let (want_re, want_im) = want_div_i(&re1, &im1);
    let mut ct_res = alloc_ct(&params, module, params.k - params.base2k - 1);
    module.ckks_div_i_into(&mut ct_res, &ct, &mut scratch.borrow()).unwrap();
    assert_unary_output_meta("div_i smaller_output", &ct_res, &ct);
    assert_decrypt_precision(
        "div_i",
        &params,
        module,
        &encoder,
        &ct_res,
        &sk,
        &want_re,
        &want_im,
        &mut scratch.borrow(),
    );
}

pub fn test_div_i_assign<BE, F, E>(params: CKKSTestParams, module: &Module<BE>, host_module: &Module<HostBytesBackend>)
where
    BE: TestContextBackend,
    Module<BE>: TestContextModule<BE>,
    F: TestScalar,
    E: NegacyclicFFT<F> + NegacyclicFFTNew<F>,
{
    let m = params.n / 2;
    let encoder = Encoder::<E>::new(m).unwrap();
    let (re1, im1) = test_vector_1::<F>(m);
    let sk = gen_sk(&params, module, host_module, [0u8; 32]);
    let mut scratch = alloc_scratch(&params, module);

    let mut ct = ckks_encrypt(
        &params,
        module,
        host_module,
        &encoder,
        &sk,
        params.k,
        &re1,
        &im1,
        &mut scratch.borrow(),
    );
    let (want_re, want_im) = want_div_i(&re1, &im1);
    let expected_log_delta = ct.log_delta();
    let expected_log_budget = ct.log_budget();
    module.ckks_div_i_assign(&mut ct, &mut scratch.borrow()).unwrap();
    assert_ct_meta("div_i_assign", &ct, expected_log_delta, expected_log_budget);
    assert_decrypt_precision(
        "div_i_assign",
        &params,
        module,
        &encoder,
        &ct,
        &sk,
        &want_re,
        &want_im,
        &mut scratch.borrow(),
    );
}