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; libcrash -- cryptographic hash (and other) functions

;

; Copyright (C) <2013,2016,2019,2021> Ivan Baravy

;

; SPDX-License-Identifier: GPL-2.0-or-later

;

; This program is free software: you can redistribute it and/or modify it under

; the terms of the GNU General Public License as published by the Free Software

; Foundation, either version 2 of the License, or (at your option) any later

; version.

;

; This program is distributed in the hope that it will be useful, but WITHOUT

; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

; FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

;

; You should have received a copy of the GNU General Public License along with

; this program. If not, see .

SHA3_224_BLOCK_SIZE = 144

SHA3_256_BLOCK_SIZE = 136

SHA3_384_BLOCK_SIZE = 104

SHA3_512_BLOCK_SIZE = 72

SHA3_MAX_BLOCK_SIZE = SHA3_224_BLOCK_SIZE

SHA3_INIT_SIZE          = 200

SHA3_ALIGN              = 16

SHA3_ALIGN_MASK         = SHA3_ALIGN-1

struct ctx_sha3

        hash            rb SHA3_INIT_SIZE

                        rb SHA3_ALIGN - (SHA3_INIT_SIZE mod SHA3_ALIGN)

        block           rb SHA3_MAX_BLOCK_SIZE

                        rb SHA3_ALIGN - (SHA3_MAX_BLOCK_SIZE mod SHA3_ALIGN)

        index           rd 1

        block_size      rd 1

        rounds_cnt      rd 1

                        rd 1    ; align

        ; tmp vars

        C               rq 5

        D               rq 5

ends

assert sizeof.ctx_sha3 <= LIBCRASH_CTX_LEN

macro sha3._.rol_xor nd, ncl, ncr

{

        movq    mm0, [C + 8*(ncl)]

        movq    mm1, mm0

        psllq   mm0, 1

        psrlq   mm1, 63

        por     mm0, mm1

        pxor    mm0, [C + 8*(ncr)]

        movq    [D + 8*(nd)], mm0

}

proc sha3._.theta

;locals

;        C       rq 5

;        D       rq 5

;endl

C equ ebx + ctx_sha3.C

D equ ebx + ctx_sha3.D

repeat 5

        movq    mm0, [edi + 8*(%-1 +  0)]

        pxor    mm0, [edi + 8*(%-1 +  5)]

        pxor    mm0, [edi + 8*(%-1 + 10)]

        pxor    mm0, [edi + 8*(%-1 + 15)]

        pxor    mm0, [edi + 8*(%-1 + 20)]

        movq    [C + 8*(%-1)], mm0

end repeat

        sha3._.rol_xor  0, 1, 4

        sha3._.rol_xor  1, 2, 0

        sha3._.rol_xor  2, 3, 1

        sha3._.rol_xor  3, 4, 2

        sha3._.rol_xor  4, 0, 3

repeat 5

        movq    mm1, [D + 8*(%-1)]

        movq    mm0, mm1

        pxor    mm0, [edi + 8*(%-1 +  0)]

        movq    [edi + 8*(%-1 +  0)], mm0

        movq    mm0, mm1

        pxor    mm0, [edi + 8*(%-1 +  5)]

        movq    [edi + 8*(%-1 +  5)], mm0

        movq    mm0, mm1

        pxor    mm0, [edi + 8*(%-1 + 10)]

        movq    [edi + 8*(%-1 + 10)], mm0

        movq    mm0, mm1

        pxor    mm0, [edi + 8*(%-1 + 15)]

        movq    [edi + 8*(%-1 + 15)], mm0

        movq    mm0, mm1

        pxor    mm0, [edi + 8*(%-1 + 20)]

        movq    [edi + 8*(%-1 + 20)], mm0

end repeat

restore C,D

        ret

endp

proc sha3._.pi

        movq    mm1, [edi + 8*1]

        movq    mm0, [edi + 8*6]

        movq    [edi + 8*1], mm0

        movq    mm0, [edi + 8*9]

        movq    [edi + 8*6], mm0

        movq    mm0, [edi + 8*22]

        movq    [edi + 8*9], mm0

        movq    mm0, [edi + 8*14]

        movq    [edi + 8*22], mm0

        movq    mm0, [edi + 8*20]

        movq    [edi + 8*14], mm0

        movq    mm0, [edi + 8*2]

        movq    [edi + 8*20], mm0

        movq    mm0, [edi + 8*12]

        movq    [edi + 8*2], mm0

        movq    mm0, [edi + 8*13]

        movq    [edi + 8*12], mm0

        movq    mm0, [edi + 8*19]

        movq    [edi + 8*13], mm0

        movq    mm0, [edi + 8*23]

        movq    [edi + 8*19], mm0

        movq    mm0, [edi + 8*15]

        movq    [edi + 8*23], mm0

        movq    mm0, [edi + 8*4]

        movq    [edi + 8*15], mm0

        movq    mm0, [edi + 8*24]

        movq    [edi + 8*4], mm0

        movq    mm0, [edi + 8*21]

        movq    [edi + 8*24], mm0

        movq    mm0, [edi + 8*8]

        movq    [edi + 8*21], mm0

        movq    mm0, [edi + 8*16]

        movq    [edi + 8*8], mm0

        movq    mm0, [edi + 8*5]

        movq    [edi + 8*16], mm0

        movq    mm0, [edi + 8*3]

        movq    [edi + 8*5], mm0

        movq    mm0, [edi + 8*18]

        movq    [edi + 8*3], mm0

        movq    mm0, [edi + 8*17]

        movq    [edi + 8*18], mm0

        movq    mm0, [edi + 8*11]

        movq    [edi + 8*17], mm0

        movq    mm0, [edi + 8*7]

        movq    [edi + 8*11], mm0

        movq    mm0, [edi + 8*10]

        movq    [edi + 8*7], mm0

        movq    [edi + 8*10], mm1

        ret

endp

proc sha3._.chi

        mov     eax, 0xffffffff

        movd    mm0, eax

        movq    mm2, mm0

        punpckldq mm2, mm0

repeat 5

        movq    mm6, [edi + 8*(0 + 5*(%-1))]

        movq    mm7, [edi + 8*(1 + 5*(%-1))]

        movq    mm0, [edi + 8*(0 + 5*(%-1))]

        movq    mm1, mm7

        pandn   mm1, mm2

        pand    mm1, [edi + 8*(2 + 5*(%-1))]

        pxor    mm0, mm1

        movq    [edi + 8*(0 + 5*(%-1))], mm0

        movq    mm0, [edi + 8*(1 + 5*(%-1))]

        movq    mm1, [edi + 8*(2 + 5*(%-1))]

        pandn   mm1, mm2

        pand    mm1, [edi + 8*(3 + 5*(%-1))]

        pxor    mm0, mm1

        movq    [edi + 8*(1 + 5*(%-1))], mm0

        movq    mm0, [edi + 8*(2 + 5*(%-1))]

        movq    mm1, [edi + 8*(3 + 5*(%-1))]

        pandn   mm1, mm2

        pand    mm1, [edi + 8*(4 + 5*(%-1))]

        pxor    mm0, mm1

        movq    [edi + 8*(2 + 5*(%-1))], mm0

        movq    mm0, [edi + 8*(3 + 5*(%-1))]

        movq    mm1, [edi + 8*(4 + 5*(%-1))]

        pandn   mm1, mm2

        pand    mm1, mm6

        pxor    mm0, mm1

        movq    [edi + 8*(3 + 5*(%-1))], mm0

        movq    mm0, [edi + 8*(4 + 5*(%-1))]

        movq    mm1, mm6

        pandn   mm1, mm2

        pand    mm1, mm7

        pxor    mm0, mm1

        movq    [edi + 8*(4 + 5*(%-1))], mm0

end repeat

        ret

endp

macro sha3._.rol_mov n, c

{

        movq    mm0, [edi + 8*(n)]

        movq    mm1, mm0

        psllq   mm0, (c)

        psrlq   mm1, (64-(c))

        por     mm0, mm1

        movq    [edi + 8*(n)], mm0

}

proc sha3._.permutation

repeat 24

        stdcall sha3._.theta

        sha3._.rol_mov   1,  1

        sha3._.rol_mov   2, 62

        sha3._.rol_mov   3, 28

        sha3._.rol_mov   4, 27

        sha3._.rol_mov   5, 36

        sha3._.rol_mov   6, 44

        sha3._.rol_mov   7,  6

        sha3._.rol_mov   8, 55

        sha3._.rol_mov   9, 20

        sha3._.rol_mov  10,  3

        sha3._.rol_mov  11, 10

        sha3._.rol_mov  12, 43

        sha3._.rol_mov  13, 25

        sha3._.rol_mov  14, 39

        sha3._.rol_mov  15, 41

        sha3._.rol_mov  16, 45

        sha3._.rol_mov  17, 15

        sha3._.rol_mov  18, 21

        sha3._.rol_mov  19,  8

        sha3._.rol_mov  20, 18

        sha3._.rol_mov  21,  2

        sha3._.rol_mov  22, 61

        sha3._.rol_mov  23, 56

        sha3._.rol_mov  24, 14

        stdcall sha3._.pi

        stdcall sha3._.chi

        movq    mm0, [edi + 8*(0)]

        pxor    mm0, [sha3._.round + 8*(%-1)]

        movq    [edi + 8*(0)], mm0

end repeat

        ret

endp

proc sha3._.init uses edi

        mov     [ebx + ctx_sha3.block_size], eax

        shr     eax, 3

        dec     eax

        mov     [ebx + ctx_sha3.rounds_cnt], eax

        xor     eax, eax

        lea     edi, [ebx + ctx_sha3.hash]

        mov     ecx, SHA3_INIT_SIZE/4

        rep stosd

        mov     [ebx + ctx_sha3.index], eax

        ret

endp

proc sha3_224.init uses ebx, _ctx

        mov     ebx, [_ctx]

        mov     eax, SHA3_224_BLOCK_SIZE

        stdcall sha3._.init

        ret

endp

proc sha3_256.init uses ebx, _ctx

        mov     ebx, [_ctx]

        mov     eax, SHA3_256_BLOCK_SIZE

        stdcall sha3._.init

        ret

endp

proc sha3_384.init uses ebx, _ctx

        mov     ebx, [_ctx]

        mov     eax, SHA3_384_BLOCK_SIZE

        stdcall sha3._.init

        ret

endp

proc sha3_512.init uses ebx, _ctx

        mov     ebx, [_ctx]

        mov     eax, SHA3_512_BLOCK_SIZE

        stdcall sha3._.init

        ret

endp

proc sha3._.block _hash

        mov     ecx, [ebx + ctx_sha3.rounds_cnt]

        mov     edi, [_hash]

    @@:

        movq    mm0, [esi + 8*ecx]

        pxor    mm0, [edi + 8*ecx]

        movq    [edi + 8*ecx], mm0

        dec     ecx

        jns     @b

        stdcall sha3._.permutation

        ret

endp

sha3_224.update = sha3.update

sha3_256.update = sha3.update

sha3_384.update = sha3.update

sha3_512.update = sha3.update

proc sha3.update uses ebx esi edi, _ctx, _msg, _size

.next_block:

        mov     ebx, [_ctx]

        mov     esi, [_msg]

        mov     eax, [ebx + ctx_sha3.index]

        test    eax, eax

        jnz     .copy_to_buf

        test    esi, SHA3_ALIGN_MASK

        jnz     .copy_to_buf

.no_copy:

        ; data is aligned, hash it in place without copying

        mov     ebx, [_ctx]

        mov     eax, [ebx + ctx_sha3.block_size]

        cmp     [_size], eax

        jb      .copy_quit

        lea     eax, [ebx + ctx_sha3.hash]

        push    ebx esi

        stdcall sha3._.block, eax

        pop     esi ebx

        mov     eax, [ebx + ctx_sha3.block_size]

        sub     [_size], eax

        add     esi, [ebx + ctx_sha3.block_size]

        jmp     .no_copy

.copy_to_buf:

        lea     edi, [ebx + ctx_sha3.block]

        add     edi, eax

        mov     ecx, [ebx + ctx_sha3.block_size]

        sub     ecx, eax

        cmp     [_size], ecx

        jb      .copy_quit

        sub     [_size], ecx

        add     [_msg], ecx

        add     [ebx + ctx_sha3.index], ecx

        mov     eax, [ebx + ctx_sha3.block_size]

        cmp     [ebx + ctx_sha3.index], eax

        jb      @f

        sub     [ebx + ctx_sha3.index], eax

    @@:

        rep movsb

        lea     eax, [ebx + ctx_sha3.hash]

        lea     esi, [ebx + ctx_sha3.block]

        stdcall sha3._.block, eax

        jmp     .next_block

.copy_quit:

        mov     ebx, [_ctx]

        lea     edi, [ebx + ctx_sha3.block]

        mov     eax, [ebx + ctx_sha3.index]

        add     edi, eax

        mov     ecx, [_size]

        add     [ebx + ctx_sha3.index], ecx

        rep movsb

.quit:

        ret

endp

sha3_224.finish = sha3.finish

sha3_256.finish = sha3.finish

sha3_384.finish = sha3.finish

sha3_512.finish = sha3.finish

proc sha3.finish uses ebx esi edi, _ctx

        mov     ebx, [_ctx]

        mov     eax, [ebx + ctx_sha3.index]

        mov     ecx, [ebx + ctx_sha3.block_size]

        sub     ecx, eax

        lea     edi, [ebx+ctx_sha3.block]

        add     edi, eax

        mov     byte[edi], 0x06

        inc     edi

        dec     ecx

        xor     eax, eax

        rep stosb

        or      byte[edi - 1], 0x80

        mov     ebx, [_ctx]

        lea     esi, [ebx + ctx_sha3.block]

        lea     eax, [ebx + ctx_sha3.hash]

        stdcall sha3._.block, eax

        mov     ebx, [_ctx]

        lea     eax, [ebx + ctx_sha3.hash]

        stdcall sha3._.postprocess, ebx, eax

        ret

endp

proc sha3._.postprocess _ctx, _hash

        emms

        ret

endp

proc sha3_224.oneshot _ctx, _data, _len

        stdcall sha3_224.init, [_ctx]

        stdcall sha3.update, [_ctx], [_data], [_len]

        stdcall sha3.finish, [_ctx]

        ret

endp

proc sha3_256.oneshot _ctx, _data, _len

        stdcall sha3_256.init, [_ctx]

        stdcall sha3.update, [_ctx], [_data], [_len]

        stdcall sha3.finish, [_ctx]

        ret

endp

proc sha3_384.oneshot _ctx, _data, _len

        stdcall sha3_384.init, [_ctx]

        stdcall sha3.update, [_ctx], [_data], [_len]

        stdcall sha3.finish, [_ctx]

        ret

endp

proc sha3_512.oneshot _ctx, _data, _len

        stdcall sha3_512.init, [_ctx]

        stdcall sha3.update, [_ctx], [_data], [_len]

        stdcall sha3.finish, [_ctx]

        ret

endp

iglobal

align SHA3_ALIGN

sha3._.round    dq 0x0000000000000001, 0x0000000000008082, 0x800000000000808A,\

                   0x8000000080008000, 0x000000000000808B, 0x0000000080000001,\

                   0x8000000080008081, 0x8000000000008009, 0x000000000000008A,\

                   0x0000000000000088, 0x0000000080008009, 0x000000008000000A,\

                   0x000000008000808B, 0x800000000000008B, 0x8000000000008089,\

                   0x8000000000008003, 0x8000000000008002, 0x8000000000000080,\

                   0x000000000000800A, 0x800000008000000A, 0x8000000080008081,\

                   0x8000000000008080, 0x0000000080000001, 0x8000000080008008

endg