Novel Shuffling Countermeasure for Advanced Encryption Standard (AES) against Profiled Attack in Mobile Multimedia Services

Listing 2

Assembly code for the novel countermeasure.

1; OUT[i] = Sbox[IN[i]]

2 movw r26, r22

3 movw r28, r24

4 ld  r30, Y+

5 movw r24, r28

6 ldi  r31, 0x00

7 subi  r30, 0xF6

8 sbci  r31, 0xDF

9 ld  r20, Z