indcpakeypair function

void indcpakeypair(Uint8List pk, Uint8List sk)

Implementation

void indcpakeypair(Uint8List pk, Uint8List sk) {
  Uint8List seed = randombytes(KYBER_SYMBYTES);
  Uint8List seedbuf = shake128(seed, KYBER_SYMBYTES * 2);
  Uint8List publicseed = seedbuf.sublist(0, KYBER_SYMBYTES);
  Uint8List noiseseed = seedbuf.sublist(KYBER_SYMBYTES, 2 * KYBER_SYMBYTES);

  List<List<Poly>> A = genMatrix(publicseed, false);
  PolyVec s = PolyVec();
  PolyVec e = PolyVec();
  for (int i = 0; i < KYBER_K; i++) {
    polygetnoise(s.vec[i], noiseseed, i);
    polygetnoise(e.vec[i], noiseseed, i + KYBER_K);
  }

  polyvecntt(s);
  polyvecntt(e);

  PolyVec pkvec = PolyVec();
  for (int i = 0; i < KYBER_K; i++) {
    pkvec.vec[i] = Poly();
    for (int j = 0; j < KYBER_K; j++) {
      Poly t = polybasemul(A[i][j], s.vec[j]);
      if (j == 0) {
        pkvec.vec[i] = t;
      } else {
        pkvec.vec[i] = polyadd(pkvec.vec[i], t);
      }
    }
    pkvec.vec[i] = polyadd(pkvec.vec[i], e.vec[i]);
  }

  Uint8List pkpv = polyveccompress(pkvec);
  for (int i = 0; i < pkpv.length; i++) {
    pk[i] = pkpv[i];
  }
  for (int i = 0; i < KYBER_SYMBYTES; i++) {
    pk[KYBER_POLYVECCOMPRESSEDBYTES + i] = publicseed[i];
  }

  Uint8List skpv = polyvectobytes(s);
  for (int i = 0; i < skpv.length; i++) {
    sk[i] = skpv[i];
  }
}