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Commit f3aebef1 authored by Niels Möller's avatar Niels Möller
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Assembler implementation of 

sha1_compress. (Not yet working).

Rev: src/nettle/x86/sha1-compress.asm:1.1
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C nettle, low-level cryptographics library
C
C Copyright (C) 2004, Niels Mller
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., 59 Temple Place - Suite 330, Boston,
C MA 02111-1307, USA.
C Register usage
define(<SA>,<%eax>)
define(<SB>,<%ebx>)
define(<SC>,<%ecx>)
define(<SD>,<%edx>)
define(<SE>,<%ebp>)
define(<DATA>,<%esi>)
define(<TMP>,<%edi>)
C Extra temporary needed by F3. Can we get rid of it?
define(<TMP2>,<(%esp)>)
C Constants
define(<K1>, <<$>0x5A827999>) C Rounds 0-19
define(<K2>, <<$>0x6ED9EBA1>) C Rounds 20-39
define(<K3>, <<$>0x8F1BBCDC>) C Rounds 40-59
define(<K4>, <<$>0xCA62C1D6>) C Rounds 60-79
C expand(i) is the expansion function
C
C W[i] = W[i - 16] ^ W[i - 14] ^ W[i - 8] ^ W[i - 3]
C
C where W[i] is stored in DATA[i & 15].
C
C Result is stored back in W[i], and also left in TMP, the only register that is used.
define(<EXPAND>, <
movl eval(4 * ($1 & 15)) (DATA), TMP
xorl eval(4 * (($1 + 2) & 15)) (DATA), TMP
xorl eval(4 * (($1 + 8) & 15)) (DATA), TMP
xorl eval(4 * (($1 + 13) & 15)) (DATA), TMP
movl TMP, eval(4 * ($1 & 15)) (DATA)
>)dnl
define(<NOEXPAND>, <eval(4 * ($1 & 15)) (DATA)>)dnl
C The f functions,
C
C f1(x,y,z) = z ^ (x & (y ^ z))
C f2(x,y,z) = x ^ y ^ z
C f3(x,y,z) = (x & y) | (z & (x | y))
C f4 = f2
C
C The macro Fk(x,y,z) computes = fk(x,y,z).
C Result is left in TMP. May the TMP2 stackslot.
define(<F1>, <
movl $3, TMP
xorl $2, TMP
andl $1, TMP
xorl $3, TMP
>)dnl
define(<F2>, <
movl $1, TMP
xorl $2, TMP
xorl $3, TMP
>)dnl
C We have one register too little. Can this be rewritten so we don't need the stack?
define(<F3>, <
movl $1, TMP
andl $2, TMP
movl TMP, TMP2
movl $1, TMP
orl $2, TMP
andl $3, TMP
orl TMP2, TMP
>)dnl
C The form of the sha1 subround is
C
C a' = e + a <<< 5 + f( b, c, d ) + k + w;
C b' = a;
C c' = b <<< 30;
C d' = c;
C e' = d;
C
C where <<< denotes rotation. We permute our variables, so that we
C instead get
C
C e += a <<< 5 + f( b, c, d ) + k + w;
C b <<<= 30
C
C round(a,b,c,d,e,f,k,w)
define(<round>, <
addl $7, $5
addl $8, $5
$6($2,$3,$4)
addl TMP, $5
movl $1, TMP
roll <$>5, TMP
addl TMP, $5
roll <$>30, $2
>)dnl
.file "sha1-compress.asm"
C sha1_compress(uint32_t *state, uint32_t *data)
.text
.align 16
.globl _nettle_sha1_compress
.type _nettle_sha1_compress,@function
_nettle_sha1_compress:
C save all registers that need to be saved
pushl %ebx C 16(%esp)
pushl %ebp C 12(%esp)
pushl %esi C 8(%esp)
pushl %edi C 4(%esp)
subl $4, %esp C 0(%esp) = TMP
C load the state vector
movl 24(%esp),TMP
movl (TMP), SA
movl 4(TMP), SB
movl 8(TMP), SC
movl 12(TMP), SD
movl 16(TMP), SE
movl 28(%esp), DATA
round(SA, SB, SC, SD, SE, <F1>, K1, NOEXPAND( 0))
round(SE, SA, SB, SC, SD, <F1>, K1, NOEXPAND( 1))
round(SD, SE, SA, SB, SC, <F1>, K1, NOEXPAND( 2))
round(SC, SD, SE, SA, SB, <F1>, K1, NOEXPAND( 3))
round(SB, SC, SD, SE, SA, <F1>, K1, NOEXPAND( 4))
round(SA, SB, SC, SD, SE, <F1>, K1, NOEXPAND( 5))
round(SE, SA, SB, SC, SD, <F1>, K1, NOEXPAND( 6))
round(SD, SE, SA, SB, SC, <F1>, K1, NOEXPAND( 7))
round(SC, SD, SE, SA, SB, <F1>, K1, NOEXPAND( 8))
round(SB, SC, SD, SE, SA, <F1>, K1, NOEXPAND( 9))
round(SA, SB, SC, SD, SE, <F1>, K1, NOEXPAND(10))
round(SE, SA, SB, SC, SD, <F1>, K1, NOEXPAND(11))
round(SD, SE, SA, SB, SC, <F1>, K1, NOEXPAND(12))
round(SC, SD, SE, SA, SB, <F1>, K1, NOEXPAND(13))
round(SB, SC, SD, SE, SA, <F1>, K1, NOEXPAND(14))
round(SA, SB, SC, SD, SE, <F1>, K1, NOEXPAND(15))
EXPAND(16) round(SE, SA, SB, SC, SD, <F1>, K1, TMP)
EXPAND(17) round(SD, SE, SA, SB, SC, <F1>, K1, TMP)
EXPAND(18) round(SC, SD, SE, SA, SB, <F1>, K1, TMP)
EXPAND(19) round(SB, SC, SD, SE, SA, <F1>, K1, TMP)
EXPAND(20) round(SA, SB, SC, SD, SE, <F2>, K2, TMP)
EXPAND(21) round(SE, SA, SB, SC, SD, <F2>, K2, TMP)
EXPAND(22) round(SD, SE, SA, SB, SC, <F2>, K2, TMP)
EXPAND(23) round(SC, SD, SE, SA, SB, <F2>, K2, TMP)
EXPAND(24) round(SB, SC, SD, SE, SA, <F2>, K2, TMP)
EXPAND(25) round(SA, SB, SC, SD, SE, <F2>, K2, TMP)
EXPAND(26) round(SE, SA, SB, SC, SD, <F2>, K2, TMP)
EXPAND(27) round(SD, SE, SA, SB, SC, <F2>, K2, TMP)
EXPAND(28) round(SC, SD, SE, SA, SB, <F2>, K2, TMP)
EXPAND(29) round(SB, SC, SD, SE, SA, <F2>, K2, TMP)
EXPAND(30) round(SA, SB, SC, SD, SE, <F2>, K2, TMP)
EXPAND(31) round(SE, SA, SB, SC, SD, <F2>, K2, TMP)
EXPAND(32) round(SD, SE, SA, SB, SC, <F2>, K2, TMP)
EXPAND(33) round(SC, SD, SE, SA, SB, <F2>, K2, TMP)
EXPAND(34) round(SB, SC, SD, SE, SA, <F2>, K2, TMP)
EXPAND(35) round(SA, SB, SC, SD, SE, <F2>, K2, TMP)
EXPAND(36) round(SE, SA, SB, SC, SD, <F2>, K2, TMP)
EXPAND(37) round(SD, SE, SA, SB, SC, <F2>, K2, TMP)
EXPAND(38) round(SC, SD, SE, SA, SB, <F2>, K2, TMP)
EXPAND(39) round(SB, SC, SD, SE, SA, <F2>, K2, TMP)
EXPAND(40) round(SA, SB, SC, SD, SE, <F3>, K3, TMP)
EXPAND(41) round(SE, SA, SB, SC, SD, <F3>, K3, TMP)
EXPAND(42) round(SD, SE, SA, SB, SC, <F3>, K3, TMP)
EXPAND(43) round(SC, SD, SE, SA, SB, <F3>, K3, TMP)
EXPAND(44) round(SB, SC, SD, SE, SA, <F3>, K3, TMP)
EXPAND(45) round(SA, SB, SC, SD, SE, <F3>, K3, TMP)
EXPAND(46) round(SE, SA, SB, SC, SD, <F3>, K3, TMP)
EXPAND(47) round(SD, SE, SA, SB, SC, <F3>, K3, TMP)
EXPAND(48) round(SC, SD, SE, SA, SB, <F3>, K3, TMP)
EXPAND(49) round(SB, SC, SD, SE, SA, <F3>, K3, TMP)
EXPAND(50) round(SA, SB, SC, SD, SE, <F3>, K3, TMP)
EXPAND(51) round(SE, SA, SB, SC, SD, <F3>, K3, TMP)
EXPAND(52) round(SD, SE, SA, SB, SC, <F3>, K3, TMP)
EXPAND(53) round(SC, SD, SE, SA, SB, <F3>, K3, TMP)
EXPAND(54) round(SB, SC, SD, SE, SA, <F3>, K3, TMP)
EXPAND(55) round(SA, SB, SC, SD, SE, <F3>, K3, TMP)
EXPAND(56) round(SE, SA, SB, SC, SD, <F3>, K3, TMP)
EXPAND(57) round(SD, SE, SA, SB, SC, <F3>, K3, TMP)
EXPAND(58) round(SC, SD, SE, SA, SB, <F3>, K3, TMP)
EXPAND(59) round(SB, SC, SD, SE, SA, <F3>, K3, TMP)
EXPAND(60) round(SA, SB, SC, SD, SE, <F2>, K4, TMP)
EXPAND(61) round(SE, SA, SB, SC, SD, <F2>, K4, TMP)
EXPAND(62) round(SD, SE, SA, SB, SC, <F2>, K4, TMP)
EXPAND(63) round(SC, SD, SE, SA, SB, <F2>, K4, TMP)
EXPAND(64) round(SB, SC, SD, SE, SA, <F2>, K4, TMP)
EXPAND(65) round(SA, SB, SC, SD, SE, <F2>, K4, TMP)
EXPAND(66) round(SE, SA, SB, SC, SD, <F2>, K4, TMP)
EXPAND(67) round(SD, SE, SA, SB, SC, <F2>, K4, TMP)
EXPAND(68) round(SC, SD, SE, SA, SB, <F2>, K4, TMP)
EXPAND(69) round(SB, SC, SD, SE, SA, <F2>, K4, TMP)
EXPAND(70) round(SA, SB, SC, SD, SE, <F2>, K4, TMP)
EXPAND(71) round(SE, SA, SB, SC, SD, <F2>, K4, TMP)
EXPAND(72) round(SD, SE, SA, SB, SC, <F2>, K4, TMP)
EXPAND(73) round(SC, SD, SE, SA, SB, <F2>, K4, TMP)
EXPAND(74) round(SB, SC, SD, SE, SA, <F2>, K4, TMP)
EXPAND(75) round(SA, SB, SC, SD, SE, <F2>, K4, TMP)
EXPAND(76) round(SE, SA, SB, SC, SD, <F2>, K4, TMP)
EXPAND(77) round(SD, SE, SA, SB, SC, <F2>, K4, TMP)
EXPAND(78) round(SC, SD, SE, SA, SB, <F2>, K4, TMP)
EXPAND(79) round(SB, SC, SD, SE, SA, <F2>, K4, TMP)
C Update the state vector
movl 24(%esp),TMP
addl SA, (TMP)
addl SB, 4(TMP)
addl SC, 8(TMP)
addl SD, 12(TMP)
addl SE, 16(TMP)
addl $4, %esp
popl %edi
popl %esi
popl %ebp
popl %ebx
ret
.Leord:
.size _nettle_sha1_compress,.Leord-_nettle_sha1_compress
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