XOR method with type error.

gistfile1.java

	private static byte[] xor(byte[] left, byte[] right, int len)
	{
		byte[] output = new byte[len];
		for (int i = 0; i < len; i++) {
			output[i] = (byte) ((byte) left[i]) ^ ((byte) right[i]);
		}

		return output;
	}

/*
GroundRound.java:41: possible loss of precision
found   : int
required: byte
			output[i] = (byte) ((byte) left[i]) ^ ((byte) right[i]);
*/