bit 1, (ix - 4)		; polynomial is 233 bits, check 234th bit
			jr z, .no_xor_poly

			; xor byte 3
			ld a, (ix - 32 + 3)
			xor 1
			ld (ix - 32 + 3), a

			; xor byte 10
			ld a, (ix - 32 + 10)
			xor 4
			ld (ix - 32 + 10), a

			; xor byte 30
			ld a, (ix - 32 + 30)
			xor 2
			ld (ix - 32 + 30), a

.no_xor_poly