pqc_kyber 0.2.1

A rust implementation of the post-quantum Kyber KEM algorithm
Documentation 
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#![allow(dead_code)]

use core::arch::x86_64::*;
use crate::params::*;
use crate::poly::NOISE_NBLOCKS;
use crate::fips202::{SHAKE128_RATE, SHAKE256_RATE};
use crate::symmetric::*;
use crate::avx2::rejsample::REJ_UNIFORM_AVX_NBLOCKS;

// Buffer unions
// #[derive(Copy, Clone)]
// #[repr(C, align(8))]
// pub(crate) union Align8<const N: usize, const V: usize> {
//   pub coeffs: [u8; N],
//   pub vec: [__m256i; V]
// }

// impl<const N: usize, const V: usize> Align8 <N, V>{
//   pub fn new() -> Self {
//     Self {
//       coeffs: [0u8; N]
//     }
//   }
// }

#[derive(Copy, Clone)]
#[repr(C, align(32))]
pub union GenMatrixBuf {
  pub coeffs: [u8; REJ_UNIFORM_AVX_NBLOCKS*SHAKE128_RATE],
  pub vec: [__m256i; (REJ_UNIFORM_AVX_NBLOCKS*SHAKE128_RATE+31)/32]
}

impl GenMatrixBuf {
  pub fn new() -> Self {
    Self { coeffs: [0u8; REJ_UNIFORM_AVX_NBLOCKS*SHAKE128_RATE]}
  }
}

#[cfg(feature="90s")]
#[repr(C)]
pub union GenMatrixBuf90s {
  pub coeffs: 
    [u8; REJ_UNIFORM_AVX_NBLOCKS*XOF_BLOCKBYTES],
  pub vec: 
    [__m256i; (REJ_UNIFORM_AVX_NBLOCKS*XOF_BLOCKBYTES+31)/32]
}

#[cfg(feature="90s")]
impl GenMatrixBuf90s {
  pub fn new() -> Self {
    Self { 
      coeffs: [0u8; REJ_UNIFORM_AVX_NBLOCKS*XOF_BLOCKBYTES]
    }
  }

  #[cfg(debug_assertions)]
  pub fn checksum(&self) -> i16 {
    let mut out = 0;
    for i in 0..REJ_UNIFORM_AVX_NBLOCKS*XOF_BLOCKBYTES {
      unsafe { out ^= self.coeffs[i] as i16; }
    }
    out
  }
}

#[repr(C)]
pub union IndcpaBuf {
  pub coeffs: [u8; 
  (KYBER_ETA1*KYBER_N/4)
  /XOF_BLOCKBYTES*XOF_BLOCKBYTES+32],
  pub vec: [__m256i; 
  ((KYBER_ETA1*KYBER_N/4)
  /XOF_BLOCKBYTES*XOF_BLOCKBYTES+32+31)/32]
}

impl IndcpaBuf {
  pub fn new() -> Self {
    Self { 
      coeffs: [0u8; 
      (KYBER_ETA1*KYBER_N/4)
      /XOF_BLOCKBYTES*XOF_BLOCKBYTES+32]
    }
  }
}

#[repr(C, align(8))]
pub union Eta2Buf {
  pub coeffs: [u8; KYBER_ETA2*KYBER_N/4],
  pub vec: [__m256i; (KYBER_ETA2*KYBER_N/4+31)/32]
}

impl Eta2Buf {
  pub fn new() -> Self {
    Self { coeffs: [0u8; KYBER_ETA2*KYBER_N/4] }
  }
}

#[derive(Copy, Clone)]
#[repr(C, align(8))]
pub union Eta4xBuf {
  pub coeffs: [u8; NOISE_NBLOCKS*SHAKE256_RATE],
  pub vec: [__m256i; (NOISE_NBLOCKS*SHAKE256_RATE+31)/32]
}

impl Eta4xBuf {
  pub fn new() -> Self {
    Self { coeffs: [0u8; NOISE_NBLOCKS*SHAKE256_RATE] }
  }
}