361 lines
5.4 KiB
NASM
361 lines
5.4 KiB
NASM
* Copyright (c) 2017 Stephen Heumann
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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* Implementation of the SHA-256 (and SHA-224) hash function for the 65816
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*
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* The basic structure of the hash computation is described in FIPS PUB 180-4,
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* although this implementation rearranges some things for better performance.
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case on
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mcopy sha256.macros
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* Direct page locations
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length gequ 0
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extra gequ 8
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zero gequ 10
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a_ gequ 12 ; elements of state
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zero2 gequ 16
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b gequ 18
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zero3 gequ 22
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c gequ 24
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zero4 gequ 28
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d gequ 30
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zero5 gequ 34
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e gequ 36
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zero6 gequ 40
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f gequ 42
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zero7 gequ 46
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g gequ 48
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zero8 gequ 52
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h gequ 54
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zero9 gequ 58
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h0 gequ 60
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h1 gequ 64
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h2 gequ 68
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h3 gequ 72
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h4 gequ 76
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h5 gequ 80
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h6 gequ 84
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h7 gequ 88
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w gequ 92
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ch gequ 156
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maj gequ 160
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k_ptr gequ 164
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idx gequ 168
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two gequ 170
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four gequ 172
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six gequ 174
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eight gequ 176
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ten gequ 178
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twelve gequ 180
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fourteen gequ 182
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sixteen gequ 184
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eighteen gequ 186
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twenty gequ 188
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twentytwo gequ 190
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twentyfour gequ 192
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twentysix gequ 194
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twentyeight gequ 196
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thirty gequ 198
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temp1 gequ 200
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temp2 gequ 204
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temp3 gequ 208
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temp4 gequ 212
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k private
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dc i4'$428a2f98, $71374491, $b5c0fbcf, $e9b5dba5'
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dc i4'$3956c25b, $59f111f1, $923f82a4, $ab1c5ed5'
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dc i4'$d807aa98, $12835b01, $243185be, $550c7dc3'
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dc i4'$72be5d74, $80deb1fe, $9bdc06a7, $c19bf174'
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dc i4'$e49b69c1, $efbe4786, $0fc19dc6, $240ca1cc'
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dc i4'$2de92c6f, $4a7484aa, $5cb0a9dc, $76f988da'
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dc i4'$983e5152, $a831c66d, $b00327c8, $bf597fc7'
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dc i4'$c6e00bf3, $d5a79147, $06ca6351, $14292967'
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dc i4'$27b70a85, $2e1b2138, $4d2c6dfc, $53380d13'
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dc i4'$650a7354, $766a0abb, $81c2c92e, $92722c85'
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dc i4'$a2bfe8a1, $a81a664b, $c24b8b70, $c76c51a3'
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dc i4'$d192e819, $d6990624, $f40e3585, $106aa070'
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dc i4'$19a4c116, $1e376c08, $2748774c, $34b0bcb5'
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dc i4'$391c0cb3, $4ed8aa4a, $5b9cca4f, $682e6ff3'
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dc i4'$748f82ee, $78a5636f, $84c87814, $8cc70208'
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dc i4'$90befffa, $a4506ceb, $bef9a3f7, $c67178f2'
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end
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* Initialize a context for SHA-256 computation.
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* An init function must be called before any of the other SHA-256 functions.
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sha256_init start
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CFunction SHA256_INIT
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end
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* Initialize a context for SHA-224 computation.
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* To compute a SHA-224 hash, call this function, and then call the below
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* functions as if computing a SHA-256 hash. After calling sha256_finalize,
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* the first 28 bytes of context->hash will contain the SHA-224 hash.
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sha224_init start
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CFunction SHA224_INIT
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end
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SHA224_INIT start
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lda #$9ed8
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sta h0
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lda #$c105
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sta h0+2
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lda #$d507
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sta h1
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lda #$367c
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sta h1+2
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lda #$dd17
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sta h2
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lda #$3070
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sta h2+2
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lda #$5939
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sta h3
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lda #$f70e
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sta h3+2
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lda #$0b31
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sta h4
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lda #$ffc0
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sta h4+2
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lda #$1511
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sta h5
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lda #$6858
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sta h5+2
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lda #$8fa7
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sta h6
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lda #$64f9
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sta h6+2
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lda #$4fa4
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sta h7
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lda #$befa
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sta h7+2
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bra initdp
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SHA256_INIT entry
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lda #$e667
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sta h0
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lda #$6a09
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sta h0+2
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lda #$ae85
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sta h1
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lda #$bb67
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sta h1+2
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lda #$f372
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sta h2
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lda #$3c6e
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sta h2+2
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lda #$f53a
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sta h3
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lda #$a54f
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sta h3+2
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lda #$527f
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sta h4
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lda #$510e
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sta h4+2
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lda #$688c
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sta h5
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lda #$9b05
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sta h5+2
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lda #$d9ab
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sta h6
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lda #$1f83
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sta h6+2
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lda #$cd19
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sta h7
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lda #$5be0
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sta h7+2
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initdp stz length
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stz length+2
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stz length+4
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stz length+6
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stz extra
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stz zero
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stz zero2
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stz zero3
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stz zero4
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stz zero5
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stz zero6
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stz zero7
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stz zero8
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stz zero9
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lda #2
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sta two
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lda #4
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sta four
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lda #6
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sta six
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lda #8
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sta eight
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lda #10
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sta ten
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lda #12
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sta twelve
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lda #14
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sta fourteen
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lda #16
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sta sixteen
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lda #18
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sta eighteen
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lda #20
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sta twenty
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lda #22
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sta twentytwo
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lda #24
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sta twentyfour
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lda #26
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sta twentysix
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lda #28
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sta twentyeight
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lda #30
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sta thirty
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rtl
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end
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* Process one 64-byte block through the SHA-256 hashing function.
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* This is a low-level function; users should normally not call this directly.
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sha256_processblock start
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CFunction SHA256_PROCESSBLOCK
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end
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SHA256_PROCESSBLOCK start
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lda h0
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sta a_
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lda h0+2
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sta a_+2
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lda h1
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sta b
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lda h1+2
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sta b+2
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lda h2
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sta c
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lda h2+2
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sta c+2
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lda h3
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sta d
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lda h3+2
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sta d+2
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lda h4
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sta e
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lda h4+2
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sta e+2
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lda h5
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sta f
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lda h5+2
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sta f+2
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lda h6
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sta g
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lda h6+2
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sta g+2
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lda h6
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sta g
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lda h6+2
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sta g+2
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lda h7
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sta h
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lda h7+2
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sta h+2
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lda #k
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sta k_ptr
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ComputeSchedule 1
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jsr BlockLoopSub
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jsr ScheduleAndBlockLoopSub
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jsr ScheduleAndBlockLoopSub
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jsr ScheduleAndBlockLoopSub
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endloop clc
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lda h0
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adc a_
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sta h0
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lda h0+2
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adc a_+2
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sta h0+2
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clc
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lda h1
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adc b
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sta h1
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lda h1+2
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adc b+2
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sta h1+2
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clc
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lda h2
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adc c
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sta h2
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lda h2+2
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adc c+2
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sta h2+2
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clc
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lda h3
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adc d
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sta h3
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lda h3+2
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adc d+2
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sta h3+2
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clc
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lda h4
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adc e
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sta h4
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lda h4+2
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adc e+2
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sta h4+2
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clc
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lda h5
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adc f
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sta h5
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lda h5+2
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adc f+2
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sta h5+2
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clc
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lda h6
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adc g
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sta h6
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lda h6+2
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adc g+2
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sta h6+2
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clc
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lda h7
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adc h
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sta h7
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lda h7+2
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adc h+2
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sta h7+2
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rtl
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ScheduleAndBlockLoopSub anop
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ComputeSchedule 2
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BlockLoopSub anop
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BlockLoopPart 1
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rts
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end
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