mirror of
https://github.com/zellyn/a2audit.git
synced 2024-11-24 11:31:01 +00:00
54710c10a0
Added tests for 0x1ff- and 0x200-length inputs. Also changed code that sets k constants to use constant values, rather than copying, to save a few bytes.
618 lines
7.0 KiB
Plaintext
618 lines
7.0 KiB
Plaintext
!to "shasum.o", plain
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* = $6000
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jmp main
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;; clear addresses:
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;; (http://apple2.org.za/gswv/a2zine/faqs/csa2pfaq.html#017)
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;; 06-09
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;; EB-EF
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;; FA-FD
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!addr SRC = $06
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!addr DST = $08
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!addr INPUT = $eb
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!addr LENGTH = $ee
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!addr TMP1 = $fa
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!addr TMP2 = $fb
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!addr PRBYTE = $FDDA
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!addr COUT = $FDED
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h0: !32 0 ; return value (hash)
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h1: !32 0
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h2: !32 0
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h3: !32 0
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h4: !32 0
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h5:
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ml: !32 0, 0 ; message length
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w: !fill 64, 0
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w_next: !fill 64, 0
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a: !32 0
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b: !32 0
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c: !32 0
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d: !32 0
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e: !32 0
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f: !32 0
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temp: !32 0
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k: !32 0
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kh0: !be32 $67452301 ; initial values for h0..h4
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kh1: !be32 $EFCDAB89
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kh2: !be32 $98BADCFE
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kh3: !be32 $10325476
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kh4: !be32 $C3D2E1F0
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k1 = $5A827999 ; k constants
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k2 = $6ED9EBA1
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k3 = $8F1BBCDC
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k4 = $CA62C1D6
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!macro set32 .target, .value {
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lda #<(.value >> 24)
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sta .target
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lda #<(.value >> 16)
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sta .target+1
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lda #<(.value >> 8)
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sta .target+2
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lda #<(.value)
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sta .target+3
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}
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!macro setSRC .source {
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lda #<.source
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sta SRC
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lda #>.source
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sta SRC+1
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}
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!macro setDST .dest {
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lda #<.dest
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sta DST
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lda #>.dest
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sta DST+1
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}
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;;; Print a string of bytes, as hex.
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;;; Address in SRC, count in A.
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;;; Burns A,Y.
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prbytes:
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ldy #0
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- pha
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lda (SRC),y
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jsr PRBYTE
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iny
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pla
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adc #$ff
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bne -
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rts
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main:
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;; Test shasum ""
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lda #0
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sta INPUT
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lda #$fe
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sta INPUT+1
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lda #0
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sta LENGTH+1
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lda #0 ; da39a3ee5e6b4b0d3255bfef95601890afd80709
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sta LENGTH
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jsr shasum
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; lda #$8d
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; jsr COUT
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+setSRC h0
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lda #(h5-h0)
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jsr prbytes
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;; Test shasum FE00[:0x37]
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lda #0
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sta INPUT
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lda #$fe
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sta INPUT+1
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lda #0
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sta LENGTH+1
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lda #$37 ; 1CF73FC6156B548A949D315120B5256245EAA33E
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sta LENGTH
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jsr shasum
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; lda #$8d
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; jsr COUT
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+setSRC h0
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lda #(h5-h0)
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jsr prbytes
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;; Test shasum FE00[:0x100]
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lda #0
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sta INPUT
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lda #$fe
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sta INPUT+1
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lda #1
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sta LENGTH+1
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lda #0 ; 7B3D05347B52210065E27054FDFD0B8B699F0965
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sta LENGTH
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jsr shasum
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; lda #$8d
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; jsr COUT
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+setSRC h0
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lda #(h5-h0)
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jsr prbytes
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;; Test shasum FE00[:0x1ff]
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lda #0
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sta INPUT
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lda #$fe
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sta INPUT+1
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lda #$1
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sta LENGTH+1
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lda #$ff ; 269CA6B0C644DAC01D908B20C10C0D5B19C52ABF
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sta LENGTH
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jsr shasum
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; lda #$8d
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; jsr COUT
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+setSRC h0
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lda #(h5-h0)
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jsr prbytes
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;; Test shasum FE00[:0x200]
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lda #0
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sta INPUT
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lda #$fe
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sta INPUT+1
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lda #2
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sta LENGTH+1
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lda #0 ; D5AC71D5EE76E31CC82CF5136151BF4CDA503601
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sta LENGTH
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jsr shasum
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; lda #$8d
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; jsr COUT
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+setSRC h0
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lda #(h5-h0)
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jsr prbytes
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rts
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shasum:
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;; Initialize h0..h4
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ldy #(h5-h0-1)
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- lda kh0,y
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sta h0,y
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dey
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bpl -
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;; Initialize message length (ml)
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lda #0
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ldy #4
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- sta ml, y
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dey
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bpl -
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lda LENGTH
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sta ml+7
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lda LENGTH+1
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sta ml+6
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;; Message length is in bits
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ldy #3
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- asl ml+7
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rol ml+6
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rol ml+5
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dey
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bne -
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;; Initialize chunk counter
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;; ldy #0 ; already zero
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;; Invert length so we can inc instead of dec
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lda LENGTH
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sec
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lda #0
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sbc LENGTH
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sta LENGTH
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lda #0
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sbc LENGTH+1
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sta LENGTH+1
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ora LENGTH
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beq .msgdone
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.loop lda (INPUT),y
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sta w,y
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iny
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cpy #$40
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bne +
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;; Call do_chunk
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jsr do_chunk
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ldy #0
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clc
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lda INPUT
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adc #$40
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sta INPUT
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bcc +
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inc INPUT+1
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+ inc LENGTH
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bne .loop
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inc LENGTH+1
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bne .loop
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.msgdone:
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lda #$80
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sta w,y
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iny
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cpy #$40
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bne .zeros
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jsr do_chunk
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ldy #0
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.zeros
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cpy #$38
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beq .length
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lda #0
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sta w,y
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iny
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cpy #$40
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bne .zeros
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jsr do_chunk
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ldy #0
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jmp .zeros
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.length
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ldy #7
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- lda ml,y
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sta w+$38,y
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dey
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bpl -
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jsr do_chunk
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rts
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;;; do_chunk processes a chunk of input. It burns A,X,Y,TMP1,TMP2.
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do_chunk:
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;; Copy a..e from h0..h4
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ldy #(f-a-1)
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- lda h0,y
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sta a,y
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dey
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bpl -
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ldy #0 ; y is index into w
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;; First 20: k1
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+set32 k, k1
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ldx #16
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- jsr kind1
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dex
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bne -
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jsr fill
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ldx #4
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- jsr kind1
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dex
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bne -
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;; Second 20: k2
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+set32 k, k2
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ldx #12
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- jsr kind2
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dex
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bne -
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jsr fill
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ldx #8
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- jsr kind2
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dex
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bne -
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;; Third 20: k3
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+set32 k, k3
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ldx #8
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- jsr kind3
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dex
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bne -
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jsr fill
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ldx #12
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- jsr kind3
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dex
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bne -
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;; Fourth 20: k4
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+set32 k, k4
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ldx #4
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- jsr kind2
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dex
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bne -
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jsr fill
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ldx #16
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- jsr kind2
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dex
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bne -
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+setSRC a
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+setDST h0
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ldx #5
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- jsr add32
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clc
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lda SRC
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adc #4
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sta SRC
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lda DST
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adc #4
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sta DST
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dex
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bne -
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rts
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kind1:
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sty TMP1
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stx TMP2
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;; f = d xor (b and (c xor d))
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+setDST f
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+setSRC d
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jsr cp32
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+setSRC c
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jsr xor32
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+setSRC b
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jsr and32
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+setSRC d
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jsr xor32
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jmp common
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kind2:
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sty TMP1
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stx TMP2
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;; f = b xor c xor d
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+setDST f
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+setSRC d
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jsr cp32
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+setSRC c
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jsr xor32
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+setSRC b
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jsr xor32
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jmp common
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kind3:
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sty TMP1
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stx TMP2
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;; f = (b and c) or (d and (b or c))
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+setSRC c
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+setDST f
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jsr cp32
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+setDST temp
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jsr cp32
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+setSRC b
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jsr and32
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+setDST f
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jsr or32
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+setSRC d
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jsr and32
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+setSRC temp
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jsr or32
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; jmp common
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common:
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;; temp = (a leftrotate 5) + f + e + k + w[i]
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+setDST temp
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+setSRC a
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jsr cp32
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jsr rol8
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jsr ror1
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jsr ror1
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jsr ror1
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+setSRC f
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jsr add32
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+setSRC e
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jsr add32
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+setSRC k
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jsr add32
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;; !setSRC w[i], and call add32
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ldy TMP1
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clc
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tya
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adc #<w
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sta SRC
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lda #0
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adc #>w
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sta SRC+1
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jsr add32
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;; e = d
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+setSRC d
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+setDST e
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jsr cp32
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;; d = c
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+setSRC c
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+setDST d
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jsr cp32
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;; c = b leftrotate 30
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+setSRC b
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+setDST c
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jsr cp32
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jsr ror1
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jsr ror1
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;; b = a
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+setSRC a
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+setDST b
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jsr cp32
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;; a = temp
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+setSRC temp
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+setDST a
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jsr cp32
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ldy TMP1
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ldx TMP2
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iny
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iny
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iny
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iny
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rts
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;; Replace w[i:i+16] with w[i+16:i+32]. Burns a. Sets y=0.
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fill:
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+setDST w_next
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+setSRC w
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ldx #0x10
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- sec
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lda DST
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sbc #16*4
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sta SRC
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jsr cp32 ; w[i] = w[i-16]
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clc
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lda SRC
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adc #2*4
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sta SRC
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jsr xor32 ; ^ w[i-14]
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lda SRC
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adc #6*4
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sta SRC
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jsr xor32 ; ^ w[i-8]
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lda SRC
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adc #5*4
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sta SRC
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jsr xor32 ; ^ w[i-3]
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jsr rol1
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clc
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lda DST
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adc #4 ; i++
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sta DST
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dex
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bne -
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ldx #w_next-w-1
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- lda w_next,x
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sta w,x
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dex
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bpl -
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ldy #0
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rts
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;;; 32-bit, big-endian math routines.
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;;; Result goes in DST. Second operand (if any)
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;;; comes from SRC.
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;; Rotate-left DST. Burns a,y.
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rol1:
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ldy #0
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lda (DST),y
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rol
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ldy #3
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- lda (DST),y
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rol
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sta (DST),y
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dey
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bpl -
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rts
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;; Rotate-right DST. Burns a,y.
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ror1:
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ldy #3
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lda (DST),y
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ror
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ldy #0
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php
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- lda (DST),y
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plp
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ror
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php
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sta (DST),y
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iny
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cpy #4
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bne -
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plp
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rts
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;; Xor SRC into DST. Burns a,y.
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xor32:
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ldy #3
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- lda (SRC),y
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eor (DST),y
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sta (DST),y
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dey
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bpl -
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rts
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;; Copy DST to SRC. Burns a,y.
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cp32:
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ldy #3
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- lda (SRC),y
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sta (DST),y
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dey
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bpl -
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rts
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add32:
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clc
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ldy #3
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- lda (SRC),y
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adc (DST),y
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sta (DST),y
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dey
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bpl -
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rts
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and32:
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clc
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ldy #3
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- lda (SRC),y
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and (DST),y
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sta (DST),y
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dey
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bpl -
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rts
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or32:
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clc
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ldy #3
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- lda (SRC),y
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ora (DST),y
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sta (DST),y
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dey
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bpl -
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rts
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;; Rotate DST right by 8 bits. Burns a,x,y.
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rol8:
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ldy #0
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lda (DST),y
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tax
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- iny
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lda (DST),y
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dey
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sta (DST),y
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iny
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cpy #3
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bne -
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txa
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sta (DST),y
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rts
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!eof
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TODOs
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[X] Routine to print n hex bytes (address, length (byte))
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[X] Routine to get the next 16 values (64 bytes) of input
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[X] Routine to get w[i] one i at a time, and rebuild next 16 values
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Needed arithmetic routines for sha1sum:
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- [X] add32
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- [X] and32
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- [X] or32
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- [X] xor32
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- [X] ROL1
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- [X] ROR1
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- [X] ROL5 --> ROL8, (ROR1,ROR1,ROR1)
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- [X] ROL30 --> (ROR1,ROR1)
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