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65816-crypto
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Add zero bytes to optimize some rotates in MD5.

This commit is contained in:
Stephen Heumann 2017-07-04 14:09:41 -05:00
parent 1d1d5251f6
commit 129f371902
2 changed files with 11 additions and 19 deletions
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10
md5.asm
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@ -26,9 +26,10 @@ a_ gequ 12 ; elements of state
b gequ 16 b gequ 16
c gequ 20 c gequ 20
d gequ 24 d gequ 24
temp2 gequ 28 zero1 gequ 28
;unused gequ 32 temp gequ 30
temp gequ 36 zero2 gequ 34
;unused gequ 36
h0 gequ 40 h0 gequ 40
h1 gequ 44 h1 gequ 44
h2 gequ 48 h2 gequ 48
@ -96,6 +97,9 @@ MD5_INIT start
stz length+4 stz length+4
stz length+6 stz length+6
stz extra stz extra
stz zero1
stz zero2
rtl rtl
end end

20
md5.macros
View File

@ -141,11 +141,7 @@
aif &n>7,.skip2 aif &n>7,.skip2
ldx &loc+1 ldx &loc+1
lda &loc+3 lda &loc+3
and #$00FF ora &loc-1
sta temp2
lda &loc-1
and #$FF00
ora temp2
sta &loc sta &loc
stx &loc+2 stx &loc+2
txa txa
@ -155,11 +151,7 @@
aif &n>11,.skip3 aif &n>11,.skip3
ldx &loc+1 ldx &loc+1
lda &loc+3 lda &loc+3
and #$00FF ora &loc-1
sta temp2
lda &loc-1
and #$FF00
ora temp2
sta &loc sta &loc
stx &loc+2 stx &loc+2
ROTL4CONT &loc,&n-8 ROTL4CONT &loc,&n-8
@ -180,7 +172,7 @@
sty &loc sty &loc
mexit mexit
.skip5 .skip5
aif &n>21,.skip6 aif &n>20,.skip6
lda &loc+2 lda &loc+2
ldy &loc ldy &loc
sta &loc sta &loc
@ -190,11 +182,7 @@
.skip6 .skip6
ldx &loc+1 ldx &loc+1
lda &loc+3 lda &loc+3
and #$00FF ora &loc-1
sta temp2
lda &loc-1
and #$FF00
ora temp2
sta &loc+2 sta &loc+2
stx &loc stx &loc
ROTR4CONT &loc,24-&n ROTR4CONT &loc,24-&n