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C x86_64/ghash-update.asm
ifelse(`
Copyright (C) 2013, 2022 Niels Möller
This file is part of GNU Nettle.
GNU Nettle is free software: you can redistribute it and/or
modify it under the terms of either:
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
or
* 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.
or both in parallel, as here.
GNU Nettle 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 copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see http://www.gnu.org/licenses/.
')
C Register usage:
define(`KEY', `%rdi')
define(`XP', `%rsi')
define(`BLOCKS', `%rdx')
define(`SRC', `%rcx')
define(`CNT', `%rax')
define(`KEY32', `%r8')
define(`X', `%xmm0')
define(`R', `%xmm1')
define(`M0', `%xmm2')
define(`M1', `%xmm3')
define(`M2', `%xmm4')
define(`M3', `%xmm5')
.file "ghash-update.asm"
C const uint8_t *_ghash_update (const struct gcm_key *key,
C union nettle_block16 *x,
C size_t blocks, const uint8_t *data)
.text
ALIGN(16)
PROLOGUE(_nettle_ghash_update)
W64_ENTRY(4, 6)
sub $1, BLOCKS
movups (XP), X
jc .Ldone
C Table offset corresponding to 32 bits.
lea 1024(KEY), KEY32
ALIGN(16)
.Lblock_loop:
C Unaligned input
movups (SRC), M0
pxor M0, X
pxor R, R
mov $992, CNT
ALIGN(16)
.Loop_bit:
movdqa X, M3
psrad $31, M3
pshufd $0x00, M3, M0
pshufd $0x55, M3, M1
pshufd $0xaa, M3, M2
pshufd $0xff, M3, M3
pslld $1, X
pand (KEY, CNT), M0
pand (KEY32, CNT), M1
pand 16(KEY, CNT), M2
pand 16(KEY32, CNT), M3
pxor M0, M1
pxor M2, M3
pxor M1, R
pxor M3, R
sub $32, CNT
jnc .Loop_bit
movaps R, X
add $16, SRC
sub $1, BLOCKS
jnc .Lblock_loop
.Ldone:
movups X, (XP)
mov SRC, %rax
W64_EXIT(4, 6)
ret
EPILOGUE(_nettle_ghash_update)
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