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IBOX A     Index into SBOX     Rabbit 4000/5000 Instruction

Opcode	Instruction	Operation
ED 12	IBOX A	A = ibox(A)

Clocks	8-Bit Access	16-Bit Unaligned	16-Bit Aligned
Rabbit 4000	4	n/a	n/a
Rabbit 5000	4	4	2

Flags				ALTD			IOI/IOE
S	Z	L/V	C	F	R	SP	S	D
-	-	-	-		·

Description

The inverse sbox structure is a 256-byte lookup table used by the AES-128 cipher. A contains the index into the table and is replaced by the referenced value from the table.