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C nettle, low-level cryptographics library
C
C Copyright (C) 2013 Niels Möller
C
C The nettle library is free software; you can redistribute it and/or modify
C it under the terms of the GNU Lesser General Public License as published by
C the Free Software Foundation; either version 2.1 of the License, or (at your
C option) any later version.
C
C The nettle library is distributed in the hope that it will be useful, but
C WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
C or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
C License for more details.
C
C You should have received a copy of the GNU Lesser General Public License
C along with the nettle library; see the file COPYING.LIB. If not, write to
C the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
C MA 02111-1301, USA.
.file "sha256-compress.asm"
define(<STATE>, <%rdi>)
define(<INPUT>, <%rsi>)
define(<K>, <%rdx>)
define(<SA>, <%eax>)
define(<SB>, <%ebx>)
define(<SC>, <%ecx>)
define(<SD>, <%r8d>)
define(<SE>, <%r9d>)
define(<SF>, <%r10d>)
define(<SG>, <%r11d>)
define(<SH>, <%r12d>)
define(<T0>, <%r13d>)
define(<T1>, <%edi>) C Overlap STATE
define(<COUNT>, <%r14>)
define(<W>, <%r15d>)
define(<EXPN>, <
movl OFFSET($1)(%rsp), W
movl OFFSET(eval(($1 + 14) % 16))(%rsp), T0
movl T0, T1
shrl <$>10, T0
roll <$>13, T1
xorl T1, T0
roll <$>2, T1
xorl T1, T0
addl T0, W
movl OFFSET(eval(($1 + 1) % 16))(%rsp), T0
movl T0, T1
shrl <$>3, T0
roll <$>14, T1
xorl T1, T0
roll <$>11, T1
xorl T1, T0
addl T0, W
addl OFFSET(eval(($1 + 9) % 16))(%rsp), W
movl W, OFFSET($1)(%rsp)
>)
C ROUND(A,B,C,D,E,F,G,H,K)
C
C H += S1(E) + Choice(E,F,G) + K + W
C D += H
C H += S0(A) + Majority(A,B,C)
C
C Where
C
C S1(E) = E<<<26 ^ E<<<21 ^ E<<<7
C S0(A) = A<<<30 ^ A<<<19 ^ A<<<10
C Choice (E, F, G) = G^(E&(F^G))
C Majority (A,B,C) = (A&B) + (C&(A^B))
define(<ROUND>, <
movl $5, T0
movl $5, T1
roll <$>7, T0
roll <$>21, T1
xorl T0, T1
roll <$>19, T0
xorl T0, T1
addl W, $8
addl T1, $8
movl $7, T0
xorl $6, T0
andl $5, T0
xorl $7, T0
addl OFFSET($9)(K,COUNT,4), $8
addl T0, $8
addl $8, $4
movl $1, T0
movl $1, T1
roll <$>10, T0
roll <$>19, T1
xorl T0, T1
roll <$>20, T0
xorl T0, T1
addl T1, $8
movl $1, T0
movl $1, T1
andl $2, T0
xorl $2, T1
addl T0, $8
andl $3, T1
addl T1, $8
>)
define(<NOEXPN>, <
movl OFFSET($1)(INPUT, COUNT, 4), W
bswapl W
movl W, OFFSET($1)(%rsp, COUNT, 4)
>)
C void
C _nettle_sha256_compress(uint32_t *state, const uint8_t *input, const uint32_t *k)
.text
ALIGN(16)
PROLOGUE(_nettle_sha256_compress)
W64_ENTRY(3, 0)
sub $120, %rsp
mov %rbx, 64(%rsp)
mov STATE, 72(%rsp) C Save state, to free a register
mov %rbp, 80(%rsp)
mov %r12, 88(%rsp)
mov %r13, 96(%rsp)
mov %r14, 104(%rsp)
mov %r15, 112(%rsp)
movl (STATE), SA
movl 4(STATE), SB
movl 8(STATE), SC
movl 12(STATE), SD
movl 16(STATE), SE
movl 20(STATE), SF
movl 24(STATE), SG
movl 28(STATE), SH
xor COUNT, COUNT
ALIGN(16)
.Loop1:
NOEXPN(0) ROUND(SA,SB,SC,SD,SE,SF,SG,SH,0)
NOEXPN(1) ROUND(SH,SA,SB,SC,SD,SE,SF,SG,1)
NOEXPN(2) ROUND(SG,SH,SA,SB,SC,SD,SE,SF,2)
NOEXPN(3) ROUND(SF,SG,SH,SA,SB,SC,SD,SE,3)
NOEXPN(4) ROUND(SE,SF,SG,SH,SA,SB,SC,SD,4)
NOEXPN(5) ROUND(SD,SE,SF,SG,SH,SA,SB,SC,5)
NOEXPN(6) ROUND(SC,SD,SE,SF,SG,SH,SA,SB,6)
NOEXPN(7) ROUND(SB,SC,SD,SE,SF,SG,SH,SA,7)
add $8, COUNT
cmp $16, COUNT
jne .Loop1
.Loop2:
EXPN( 0) ROUND(SA,SB,SC,SD,SE,SF,SG,SH,0)
EXPN( 1) ROUND(SH,SA,SB,SC,SD,SE,SF,SG,1)
EXPN( 2) ROUND(SG,SH,SA,SB,SC,SD,SE,SF,2)
EXPN( 3) ROUND(SF,SG,SH,SA,SB,SC,SD,SE,3)
EXPN( 4) ROUND(SE,SF,SG,SH,SA,SB,SC,SD,4)
EXPN( 5) ROUND(SD,SE,SF,SG,SH,SA,SB,SC,5)
EXPN( 6) ROUND(SC,SD,SE,SF,SG,SH,SA,SB,6)
EXPN( 7) ROUND(SB,SC,SD,SE,SF,SG,SH,SA,7)
EXPN( 8) ROUND(SA,SB,SC,SD,SE,SF,SG,SH,8)
EXPN( 9) ROUND(SH,SA,SB,SC,SD,SE,SF,SG,9)
EXPN(10) ROUND(SG,SH,SA,SB,SC,SD,SE,SF,10)
EXPN(11) ROUND(SF,SG,SH,SA,SB,SC,SD,SE,11)
EXPN(12) ROUND(SE,SF,SG,SH,SA,SB,SC,SD,12)
EXPN(13) ROUND(SD,SE,SF,SG,SH,SA,SB,SC,13)
EXPN(14) ROUND(SC,SD,SE,SF,SG,SH,SA,SB,14)
EXPN(15) ROUND(SB,SC,SD,SE,SF,SG,SH,SA,15)
add $16, COUNT
cmp $64, COUNT
jne .Loop2
mov 72(%rsp), STATE
addl SA, (STATE)
addl SB, 4(STATE)
addl SC, 8(STATE)
addl SD, 12(STATE)
addl SE, 16(STATE)
addl SF, 20(STATE)
addl SG, 24(STATE)
addl SH, 28(STATE)
mov 64(%rsp), %rbx
mov 80(%rsp), %rbp
mov 88(%rsp), %r12
mov 96(%rsp), %r13
mov 104(%rsp),%r14
mov 112(%rsp),%r15
add $120, %rsp
ret
EPILOGUE(_nettle_sha256_compress)
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