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 macro
MixColumn &i,&A,&B,&C,&D,&state,&out MixColumn &i,&A,&B,&C,&D,&state,&out
aif (&i=0).AND.(&round<>1),.skip
ldy &state+&D ldy &state+&D
.skip
lda Sbox,Y lda Sbox,Y
pha pha
ldx &state+&A ldx &state+&A
@ -68,40 +70,44 @@
eor Xtime2Sbox,Y eor Xtime2Sbox,Y
eor rk+&round*16+&i+3 eor rk+&round*16+&i+3
sta &out+&i+3 sta &out+&i+3
aif &i<>12,.skip2
tay
.skip2
mend mend
macro macro
FinalRound &round FinalRound &round
FinalRoundStep 3,15,1
FinalRoundStep 15,11
FinalRoundStep 11,7
FinalRoundStep 7,3
FinalRoundStep 0,0 FinalRoundStep 0,0
FinalRoundStep 4,4 FinalRoundStep 4,4
FinalRoundStep 8,8 FinalRoundStep 8,8
FinalRoundStep 12,12 FinalRoundStep 12,12
FinalRoundStep 13,1 FinalRoundStep 13,1
FinalRoundStep 1,5 FinalRoundStep 1,5
FinalRoundStep 5,9 FinalRoundStep 5,9
FinalRoundStep 9,13 FinalRoundStep 9,13
FinalRoundStep 10,2 FinalRoundStep 10,2
FinalRoundStep 2,10 FinalRoundStep 2,10
FinalRoundStep 14,6 FinalRoundStep 14,6
FinalRoundStep 6,14 FinalRoundStep 6,14
FinalRoundStep 3,15
FinalRoundStep 15,11
FinalRoundStep 11,7
FinalRoundStep 7,3
mend mend
macro macro
FinalRoundStep &to,&from FinalRoundStep &to,&from,&skipldy
aif C:&skipldy,.skip
ldy state2+&from ldy state2+&from
.skip
lda Sbox,Y lda Sbox,Y
eor rk+&round*16+&to eor rk+&round*16+&to
sta state1+&to sta state1+&to