@FormatMethod
  private static FramingException error(final String s, final Object... params) {
    return new FramingException(String.format(s, params));
  }
Compute the bitwise XOR of two arrays of bytes. The arrays have to be of same length. No length
checking is performed.

@param x1 the first array
@param x2 the second array
@return x1 XOR x2
ethereum/p2p/src/main/java/org/hyperledger/besu/ethereum/p2p/rlpx/framing/Framer.java