- G1 ^= pgm_read_byte_near(&(skipjack_ftable[G2 ^ key[(4*k+0)%10]]));
- G2 ^= pgm_read_byte_near(&(skipjack_ftable[G1 ^ key[(4*k+1)%10]]));
- G1 ^= pgm_read_byte_near(&(skipjack_ftable[G2 ^ key[(4*k+2)%10]]));
- G2 ^= pgm_read_byte_near(&(skipjack_ftable[G1 ^ key[(4*k+3)%10]]));
+ G1 ^= pgm_read_byte_near(&(skipjack_ftable[G2 ^ key[9-(4*k+0)%10]]));
+ G2 ^= pgm_read_byte_near(&(skipjack_ftable[G1 ^ key[9-(4*k+1)%10]]));
+ G1 ^= pgm_read_byte_near(&(skipjack_ftable[G2 ^ key[9-(4*k+2)%10]]));
+ G2 ^= pgm_read_byte_near(&(skipjack_ftable[G1 ^ key[9-(4*k+3)%10]]));