indcpaenc function

void indcpaenc(Uint8List c, Uint8List m, Uint8List pk, Uint8List coins,)

Implementation

void indcpaenc(Uint8List c, Uint8List m, Uint8List pk, Uint8List coins) {
  Uint8List publicseed = pk.sublist(KYBER_POLYVECCOMPRESSEDBYTES, KYBER_POLYVECCOMPRESSEDBYTES+KYBER_SYMBYTES);
  PolyVec pkvec = polyvecdecompress(pk.sublist(0, KYBER_POLYVECCOMPRESSEDBYTES));

  List<List<Poly>> at = genMatrix(publicseed, true);

  PolyVec r = PolyVec();
  PolyVec e1 = PolyVec();
  Poly e2 = Poly();
  for (int i = 0; i < KYBER_K; i++) {
    polygetnoise(r.vec[i], coins, i);
    polygetnoise(e1.vec[i], coins, i+KYBER_K);
  }
  polygetnoise(e2, coins, 2*KYBER_K);

  polyvecntt(r);

  PolyVec u = PolyVec();
  for (int i = 0; i < KYBER_K; i++) {
    u.vec[i] = Poly();
    for (int j = 0; j < KYBER_K; j++) {
      Poly t = polybasemul(at[i][j], r.vec[j]);
      if (j == 0) {
        u.vec[i] = t;
      } else {
        u.vec[i] = polyadd(u.vec[i], t);
      }
    }
    u.vec[i] = polyadd(u.vec[i], e1.vec[i]);
  }

  Poly v = Poly();
  v.coeffs.fillRange(0, KYBER_N, 0);
  for (int i = 0; i < KYBER_K; i++) {
    Poly t = polybasemul(pkvec.vec[i], r.vec[i]);
    v = polyadd(v, t);
  }

  polyfrommsg(e2, m);
  v = polyadd(v, e2);

  Uint8List ubytes = polyveccompress(u);
  Uint8List vbytes = polycompress(v);

  for (int i = 0; i < ubytes.length; i++) {
    c[i] = ubytes[i];
  }
  for (int i = 0; i < vbytes.length; i++) {
    c[ubytes.length + i] = vbytes[i];
  }
}