docs: private byte[] digestWithoutSalt(InputStream data, int bufferLength) throws IOException {
  		final byte[] buffer = new byte[bufferLength];
  		int read;
  		while ((read = data.read(buffer, 0, bufferLength)) > -1) {
  			this.digest.update(buffer, 0, read);
  		}
  		return this.digest.digest();
  	}