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Compute SHA-1 message schedule 20 elements at a time, reusing storage.

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The reduces the storage needed and boosts performance, since the whole schedule is contained in the direct page.
This commit is contained in:
Stephen Heumann 2017-06-29 22:22:06 -05:00
parent 7182fc5817
commit aab47e38e7
2 changed files with 47 additions and 49 deletions
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10
sha1.asm
View File

@ -62,9 +62,6 @@ sha1_processchunk start
end
SHA1_PROCESSCHUNK start
ComputeSchedule
lda h0
sta a_
lda h0+2
@ -90,10 +87,17 @@ SHA1_PROCESSCHUNK start
lda h4+2
sta e+2
ComputeSchedule 1
ldx #0
BlockLoopPart 1
ComputeSchedule 2
ldx #0
BlockLoopPart 2
ComputeSchedule 3
ldx #0
BlockLoopPart 3
ComputeSchedule 4
ldx #0
BlockLoopPart 4
endloop clc

86
sha1.macros
View File

@ -105,81 +105,72 @@ dorotl
* Macros to operate on elements of the message schedule (W)
macro
&lab lda_w &i,&inc
lcla &j
&j seta &i
.modloop1
aif &j<20,.goodidx1
&j seta &j-20
ago .modloop1
.goodidx1
aif C:&inc<>0,.haveinc
lcla &inc
.haveinc
aif w+(&i)*4+&inc>255,.bigidx
&lab lda w+(&i)*4+&inc
ago .end
.bigidx
&lab ldx #((&i)-16)*4+&inc
lda w+16*4,x
.end
&lab lda w+(&j)*4+&inc
mend
macro
&lab eor_w &i,&inc
lcla &j
&j seta &i
.modloop2
aif &j<20,.goodidx2
&j seta &j-20
ago .modloop2
.goodidx2
aif C:&inc<>0,.haveinc
lcla &inc
.haveinc
aif w+(&i)*4+&inc>255,.bigidx
&lab eor w+(&i)*4+&inc
ago .end
.bigidx
&lab ldx #((&i)-16)*4+&inc
eor w+16*4,x
.end
&lab eor w+(&j)*4+&inc
mend
macro
&lab sta_w &i,&inc
lcla &j
&j seta &i
.modloop3
aif &j<20,.goodidx3
&j seta &j-20
ago .modloop3
.goodidx3
aif C:&inc<>0,.haveinc
lcla &inc
.haveinc
aif w+(&i)*4+&inc>255,.bigidx
&lab sta w+(&i)*4+&inc
ago .end
.bigidx
&lab ldx #((&i)-16)*4+&inc
sta w+16*4,x
.end
mend
macro
&lab inc_w &i,&inc
aif C:&inc<>0,.haveinc
lcla &inc
.haveinc
aif w+(&i)*4+&inc>255,.bigidx
&lab inc w+(&i)*4+&inc
ago .end
.bigidx
&lab ldx #((&i)-16)*4+&inc
inc w+16*4,x
.end
&lab sta w+(&j)*4+&inc
mend
macro
&lab rol_w &i,&inc
lcla &j
&j seta &i
.modloop4
aif &j<20,.goodidx4
&j seta &j-20
ago .modloop4
.goodidx4
aif C:&inc<>0,.haveinc
lcla &inc
.haveinc
aif w+(&i)*4+&inc>255,.bigidx
&lab rol w+(&i)*4+&inc
ago .end
.bigidx
&lab ldx #((&i)-16)*4+&inc
rol w+16*4,x
.end
&lab rol w+(&j)*4+&inc
mend
* Compute the message schedule (W_0 to W_79)
* Compute one part of the message schedule (20 elements)
macro
ComputeSchedule
ComputeSchedule &part
lcla &i
; Flip the endianness of W_0 to W_15 (the current chunk of the message)
aif &part<>1,.skippart1
.loop1
lda w+&i*4
xba
@ -190,8 +181,11 @@ dorotl
sta w+&i*4
&i seta &i+1
aif &i<16,.loop1
.skippart1
; compute the rest of the message schedule (W_16 to W_79)
aif &part=1,.loop2
&i seta (&part-1)*20
.loop2
lda_w &i-3
eor_w &i-8
@ -210,7 +204,7 @@ dorotl
rol_w &i
&i seta &i+1
aif &i<80,.loop2
aif &i<&part*20,.loop2
mend
@ -344,7 +338,7 @@ loop&part anop
inx
inx
inx
cpx #&part*20*4
cpx #20*4
bge endloop&part
jmp loop&part
endloop&part anop