Apple-2gs-SW/65816-crypto
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Save a few cycles by not reloading the last written byte between rounds.

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This commit is contained in:
Stephen Heumann 2017-06-26 21:49:16 -05:00
parent 75aac0daa9
commit f04000c83d
1 changed files with 16 additions and 10 deletions
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26
aes.macros
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@ -31,7 +31,9 @@
macro
MixColumn &i,&A,&B,&C,&D,&state,&out
aif (&i=0).AND.(&round<>1),.skip
ldy &state+&D
.skip
lda Sbox,Y
pha
ldx &state+&A
@ -68,40 +70,44 @@
eor Xtime2Sbox,Y
eor rk+&round*16+&i+3
sta &out+&i+3
aif &i<>12,.skip2
tay
.skip2
mend
macro
FinalRound &round
FinalRoundStep 3,15,1
FinalRoundStep 15,11
FinalRoundStep 11,7
FinalRoundStep 7,3
FinalRoundStep 0,0
FinalRoundStep 4,4
FinalRoundStep 8,8
FinalRoundStep 12,12
FinalRoundStep 13,1
FinalRoundStep 1,5
FinalRoundStep 5,9
FinalRoundStep 9,13
FinalRoundStep 10,2
FinalRoundStep 2,10
FinalRoundStep 14,6
FinalRoundStep 6,14
FinalRoundStep 3,15
FinalRoundStep 15,11
FinalRoundStep 11,7
FinalRoundStep 7,3
mend
macro
FinalRoundStep &to,&from
FinalRoundStep &to,&from,&skipldy
aif C:&skipldy,.skip
ldy state2+&from
.skip
lda Sbox,Y
eor rk+&round*16+&to
sta state1+&to