ByteProcessor<byte[]> processor =
        new ByteProcessor<byte[]>() {
          private final ByteArrayOutputStream out = new ByteArrayOutputStream();

          @Override
          public boolean processBytes(byte[] buffer, int offset, int length) throws IOException {
            if (length >= 0) {
              out.write(buffer, offset, length);
            }
            return true;
          }

        // Process message (will be encrypted)
        final byte[] output = new byte[cipher.getOutputSize(message.length)];
        int len = cipher.processBytes(message, 0, message.length, output, 0);
        len += cipher.doFinal(output, len);

        // Split ciphertext and authentication tag
        final int tagLength = getAuthTagLength();

    ByteProcessor<byte[]> processor =
        new ByteProcessor<byte[]>() {
          private final ByteArrayOutputStream out = new ByteArrayOutputStream();

          @Override
          public boolean processBytes(byte[] buffer, int offset, int length) throws IOException {
            if (length >= 0) {
              out.write(buffer, offset, length);
            }
            return true;
          }

    }

    @SuppressWarnings("CheckReturnValue") // it doesn't matter what processBytes returns here
    @Override
    @ParametricNullness
    public <T extends @Nullable Object> T read(ByteProcessor<T> processor) throws IOException {
      processor.processBytes(bytes, offset, length);
      return processor.getResult();
    }

    @Override

    checkNotNull(input);
    checkNotNull(processor);

    byte[] buf = createBuffer();
    int read;
    do {
      read = input.read(buf);
    } while (read != -1 && processor.processBytes(buf, 0, read));
    return processor.getResult();
  }

  /**
   * Reads some bytes from an input stream and stores them into the buffer array {@code b}. This