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Use separate loops for the four parts of the SHA-1 computation.

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This commit is contained in:
Stephen Heumann 2017-06-29 20:51:36 -05:00
parent dfdb3186fd
commit 7182fc5817
2 changed files with 224 additions and 132 deletions
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136
sha1.asm
View File

@ -1,6 +1,5 @@
case on
mcopy sha1.macros
mcopy rotate.macros
* Direct page locations
;chunk gequ 0 ; 8 bytes
@ -92,137 +91,10 @@ SHA1_PROCESSCHUNK start
sta e+2
ldx #0
loop anop
ROTL4MOVE temp,a_,5
stx idx
cpx #60*4
bge f_60
cpx #40*4
bge f_40
cpx #20*4
bge f_20
* f_0 to f_19
f_0 lda c
eor d
and b
eor d
clc
adc #$7999
sta f_plus_k
lda c+2
eor d+2
and b+2
eor d+2
adc #$5A82
sta f_plus_k+2
bra after_f
* f_20 to f_39
f_20 lda b
eor c
eor d
clc
adc #$EBA1
sta f_plus_k
lda b+2
eor c+2
eor d+2
adc #$6ED9
sta f_plus_k+2
bra after_f
* f_40 to f_59
f_40 lda c
ora d
and b
sta f40temp
lda c
and d
ora f40temp
clc
adc #$BCDC
sta f_plus_k
lda c+2
ora d+2
and b+2
sta f40temp
lda c+2
and d+2
ora f40temp
adc #$8F1B
sta f_plus_k+2
bra after_f
* f_60 to f_79
f_60 lda b
eor c
eor d
clc
adc #$C1D6
sta f_plus_k
lda b+2
eor c+2
eor d+2
adc #$CA62
sta f_plus_k+2
after_f anop
ldx idx
clc
lda w,x
adc temp
tay
lda w+2,x
adc temp+2
tax
clc
tya
adc e
tay
txa
adc e+2
tax
clc
tya
adc f_plus_k
tay
txa
adc f_plus_k+2
tax
lda d
sta e
lda d+2
sta e+2
lda c
sta d
lda c+2
sta d+2
ROTL4MOVE c,b,30
lda a_
sta b
lda a_+2
sta b+2
sty a_
stx a_+2
ldx idx
inx
inx
inx
inx
cpx #80*4
bge endloop
jmp loop
BlockLoopPart 1
BlockLoopPart 2
BlockLoopPart 3
BlockLoopPart 4
endloop clc
lda h0

220
sha1.macros
View File

@ -1,3 +1,86 @@
* Right-rotate 32-bit value in &loc (DP or 16-bit address) by &n positions
macro
ROTR4 &loc,&n
aif &n>16,.dorotl
lda &loc+2
lcla &i
&i seta &n
.rotrloop
lsr a ;to set carry
ror &loc
ror &loc+2
&i seta &i-1
aif &i>0,.rotrloop
ago .end
.dorotl
ROTL4 &loc,32-&n
.end
mend
* Left-rotate 32-bit value in &loc (DP or 16-bit address) by &n positions
macro
ROTL4 &loc,&n
aif &n>16,.dorotr
lda &loc
lcla &i
&i seta &n
.rotlloop
asl a ;to set carry
rol &loc+2
rol &loc
&i seta &i-1
aif &i>0,.rotlloop
ago .end
.dorotr
ROTR4 &loc,32-&n
.end
mend
* &to := &from ROTR4 &n
macro
ROTR4MOVE &to,&from,&n
aif &n>16,.dorotl
lda &from
sta &to
lda &from+2
sta &to+2
lcla &i
&i seta &n
.rotrloop
lsr a ;to set carry
ror &to
ror &to+2
&i seta &i-1
aif &i>0,.rotrloop
ago .end
dorotl
ROTL4MOVE &to,&from,32-&n
.end
mend
* &to := &from ROTL4 &n
macro
ROTL4MOVE &to,&from,&n
aif &n>16,.dorotr
lda &from+2
sta &to+2
lda &from
sta &to
lcla &i
&i seta &n
.rotlloop
asl a ;to set carry
rol &to+2
rol &to
&i seta &i-1
aif &i>0,.rotlloop
ago .end
.dorotr
ROTR4MOVE &to,&from,32-&n
.end
mend
* This makes a function wrapper that is callable from C,
* taking a pointer to the context structure as its argument.
macro
@ -130,3 +213,140 @@
aif &i<80,.loop2
mend
* One part of the loop for processing blocks (&part is 1, 2, 3, or 4)
macro
BlockLoopPart &part
loop&part anop
stx idx
ROTL4MOVE temp,a_,5
* f_0 to f_19
aif &part<>1,.skip1
lda c
eor d
and b
eor d
clc
adc #$7999
sta f_plus_k
lda c+2
eor d+2
and b+2
eor d+2
adc #$5A82
sta f_plus_k+2
.skip1
* f_20 to f_39
aif &part<>2,.skip2
lda b
eor c
eor d
clc
adc #$EBA1
sta f_plus_k
lda b+2
eor c+2
eor d+2
adc #$6ED9
sta f_plus_k+2
.skip2
* f_40 to f_59
aif &part<>3,.skip3
lda c
ora d
and b
sta f40temp
lda c
and d
ora f40temp
clc
adc #$BCDC
sta f_plus_k
lda c+2
ora d+2
and b+2
sta f40temp
lda c+2
and d+2
ora f40temp
adc #$8F1B
sta f_plus_k+2
.skip3
* f_60 to f_79
aif &part<>4,.skip4
lda b
eor c
eor d
clc
adc #$C1D6
sta f_plus_k
lda b+2
eor c+2
eor d+2
adc #$CA62
sta f_plus_k+2
.skip4
ldx idx
clc
lda w,x
adc temp
tay
lda w+2,x
adc temp+2
tax
clc
tya
adc e
tay
txa
adc e+2
tax
clc
tya
adc f_plus_k
tay
txa
adc f_plus_k+2
tax
lda d
sta e
lda d+2
sta e+2
lda c
sta d
lda c+2
sta d+2
ROTL4MOVE c,b,30
lda a_
sta b
lda a_+2
sta b+2
sty a_
stx a_+2
ldx idx
inx
inx
inx
inx
cpx #&part*20*4
bge endloop&part
jmp loop&part
endloop&part anop
mend