mirror of
https://github.com/arnaucube/poulpy.git
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105 lines
3.1 KiB
Rust
105 lines
3.1 KiB
Rust
use base2k::{
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Encoding, FFT64, Module, Sampling, Scalar, ScalarZnxDft, ScalarZnxDftOps, VecZnx, VecZnxBig, VecZnxBigOps, VecZnxDft,
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VecZnxDftOps, VecZnxOps, ZnxInfos, ZnxLayout, alloc_aligned,
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};
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use itertools::izip;
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use sampling::source::Source;
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fn main() {
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let n: usize = 16;
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let log_base2k: usize = 18;
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let limbs: usize = 3;
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let msg_cols: usize = 2;
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let log_scale: usize = msg_cols * log_base2k - 5;
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let module: Module<FFT64> = Module::<FFT64>::new(n);
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let mut carry: Vec<u8> = alloc_aligned(module.vec_znx_big_normalize_tmp_bytes());
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let seed: [u8; 32] = [0; 32];
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let mut source: Source = Source::new(seed);
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let mut res: VecZnx = module.new_vec_znx(1, limbs);
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// s <- Z_{-1, 0, 1}[X]/(X^{N}+1)
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let mut s: Scalar = Scalar::new(n);
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s.fill_ternary_prob(0.5, &mut source);
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// Buffer to store s in the DFT domain
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let mut s_ppol: ScalarZnxDft<FFT64> = module.new_svp_ppol();
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// s_ppol <- DFT(s)
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module.svp_prepare(&mut s_ppol, &s);
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// a <- Z_{2^prec}[X]/(X^{N}+1)
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let mut a: VecZnx = module.new_vec_znx(1, limbs);
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module.fill_uniform(log_base2k, &mut a, 0, limbs, &mut source);
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// Scratch space for DFT values
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let mut buf_dft: VecZnxDft<FFT64> = module.new_vec_znx_dft(1, a.size());
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// Applies buf_dft <- s * a
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module.svp_apply_dft(&mut buf_dft, &s_ppol, &a);
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// Alias scratch space
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let mut buf_big: VecZnxBig<FFT64> = buf_dft.as_vec_znx_big();
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// buf_big <- IDFT(buf_dft) (not normalized)
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module.vec_znx_idft_tmp_a(&mut buf_big, &mut buf_dft);
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println!("{:?}", buf_big.raw());
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let mut m: VecZnx = module.new_vec_znx(1, msg_cols);
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let mut want: Vec<i64> = vec![0; n];
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want.iter_mut()
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.for_each(|x| *x = source.next_u64n(16, 15) as i64);
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// m
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m.encode_vec_i64(0, log_base2k, log_scale, &want, 4);
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m.normalize(log_base2k, &mut carry);
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// buf_big <- m - buf_big
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module.vec_znx_big_sub_small_ab_inplace(&mut buf_big, &m);
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println!("{:?}", buf_big.raw());
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// b <- normalize(buf_big) + e
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let mut b: VecZnx = module.new_vec_znx(1, limbs);
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module.vec_znx_big_normalize(log_base2k, &mut b, &buf_big, &mut carry);
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b.print(n);
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module.add_normal(
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log_base2k,
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&mut b,
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0,
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log_base2k * limbs,
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&mut source,
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3.2,
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19.0,
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);
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// Decrypt
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// buf_big <- a * s
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module.svp_apply_dft(&mut buf_dft, &s_ppol, &a);
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module.vec_znx_idft_tmp_a(&mut buf_big, &mut buf_dft);
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// buf_big <- a * s + b
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module.vec_znx_big_add_small_inplace(&mut buf_big, &b);
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println!("raw: {:?}", &buf_big.raw());
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// res <- normalize(buf_big)
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module.vec_znx_big_normalize(log_base2k, &mut res, &buf_big, &mut carry);
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// have = m * 2^{log_scale} + e
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let mut have: Vec<i64> = vec![i64::default(); n];
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res.decode_vec_i64(0, log_base2k, res.size() * log_base2k, &mut have);
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let scale: f64 = (1 << (res.size() * log_base2k - log_scale)) as f64;
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izip!(want.iter(), have.iter())
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.enumerate()
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.for_each(|(i, (a, b))| {
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println!("{}: {} {}", i, a, (*b as f64) / scale);
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})
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}
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