How to use

limitExceeded

method

in

org.spongycastle.crypto.engines.Salsa20Engine

public byte returnByte(byte in)
{
  if (limitExceeded())
  {
    throw new MaxBytesExceededException("2^70 byte limit per IV; Change IV");
  }
  if (index == 0)
  {
    generateKeyStream(keyStream);
    if (++engineState[8] == 0)
    {
      ++engineState[9];
    }
  }
  byte out = (byte)(keyStream[index]^in);
  index = (index + 1) & 63;
  return out;
}

public byte returnByte(byte in)
{
  if (limitExceeded())
  {
    throw new MaxBytesExceededException("2^70 byte limit per IV; Change IV");
  }
  byte out = (byte)(keyStream[index]^in);
  index = (index + 1) & 63;
  if (index == 0)
  {
    advanceCounter();
    generateKeyStream(keyStream);
  }
  return out;
}

if (limitExceeded(len))

if (limitExceeded(len))