decapsulate method

@override Uint8List decapsulate(Uint8List ciphertext, Uint8List secretKey)

Implementation

@override
Uint8List decapsulate(Uint8List ciphertext, Uint8List secretKey) {
  if (ciphertext.length != _params.ciphertextBytes) {
    throw MLKEMCiphertextWrongLengthException();
  }
  if (secretKey.length != _params.secretKeyBytes) {
    throw MLKEMSecretKeyWrongLengthException();
  }
  final ct = calloc<ffi.Uint8>(_params.ciphertextBytes);
  ct.asTypedList(_params.ciphertextBytes).setAll(0, ciphertext);

  final sk = calloc<ffi.Uint8>(_params.secretKeyBytes);
  sk.asTypedList(_params.secretKeyBytes).setAll(0, secretKey);

  final ss = calloc<ffi.Uint8>(_params.sharedBytes);

  final result = _params.dec(ss, ct, sk);
  if (result != 0) {
    calloc.free(ct);
    calloc.free(sk);
    calloc.free(ss);
    throw MLKEMDecapsulationFailedException(result);
  }

  final ssBytes = Uint8List.fromList(ss.asTypedList(_params.sharedBytes));

  calloc.free(ct);
  calloc.free(sk);
  calloc.free(ss);

  return ssBytes;
}