mirror of
https://github.com/sheumann/65816-crypto.git
synced 2024-11-18 13:08:08 +00:00
133 lines
1.8 KiB
Plaintext
133 lines
1.8 KiB
Plaintext
|
* This makes a function wrapper that is callable from C,
|
||
|
|
* taking a pointer to the context structure as its argument.
|
||
|
|
macro
|
||
|
|
CFunction &fn
|
||
|
|
phb
|
||
|
|
plx
|
||
|
|
ply
|
||
|
|
tdc
|
||
|
|
pld
|
||
|
|
plb
|
||
|
|
plb
|
||
|
|
phy
|
||
|
|
phx
|
||
|
|
plb
|
||
|
|
pha
|
||
|
|
jsl &fn
|
||
|
|
pld
|
||
|
|
rtl
|
||
|
|
mend
|
||
|
|
|
||
|
|
|
||
|
|
* Macros to operate on elements of the message schedule (W)
|
||
|
|
macro
|
||
|
|
&lab lda_w &i,&inc
|
||
|
|
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
|
||
|
|
mend
|
||
|
|
|
||
|
|
macro
|
||
|
|
&lab eor_w &i,&inc
|
||
|
|
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
|
||
|
|
mend
|
||
|
|
|
||
|
|
macro
|
||
|
|
&lab sta_w &i,&inc
|
||
|
|
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
|
||
|
|
mend
|
||
|
|
|
||
|
|
macro
|
||
|
|
&lab rol_w &i,&inc
|
||
|
|
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
|
||
|
|
mend
|
||
|
|
|
||
|
|
|
||
|
|
* Compute the message schedule (W_0 to W_79)
|
||
|
|
macro
|
||
|
|
ComputeSchedule
|
||
|
|
lcla &i
|
||
|
|
|
||
|
|
; Flip the endianness of W_0 to W_15 (the current chunk of the message)
|
||
|
|
.loop1
|
||
|
|
lda w+&i*4
|
||
|
|
xba
|
||
|
|
ldx w+&i*4+2
|
||
|
|
sta w+&i*4+2
|
||
|
|
txa
|
||
|
|
xba
|
||
|
|
sta w+&i*4
|
||
|
|
&i seta &i+1
|
||
|
|
aif &i<16,.loop1
|
||
|
|
|
||
|
|
; compute the rest of the message schedule (W_16 to W_79)
|
||
|
|
.loop2
|
||
|
|
lda_w &i-3
|
||
|
|
eor_w &i-8
|
||
|
|
eor_w &i-14
|
||
|
|
eor_w &i-16
|
||
|
|
sta_w &i
|
||
|
|
asl a ; to set carry
|
||
|
|
|
||
|
|
lda_w &i-3,2
|
||
|
|
eor_w &i-8,2
|
||
|
|
eor_w &i-14,2
|
||
|
|
eor_w &i-16,2
|
||
|
|
rol a
|
||
|
|
sta_w &i,2
|
||
|
|
|
||
|
|
rol_w &i
|
||
|
|
|
||
|
|
&i seta &i+1
|
||
|
|
aif &i<80,.loop2
|
||
|
|
mend
|
||
|
|
|