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C x86_64/aesni/aes-encrypt-internal.asm
ifelse(<
Copyright (C) 2015 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 Input argument
define(<ROUNDS>, <%rdi>)
define(<KEYS>, <%rsi>)
C define(<TABLE>, <%rdx>) C Unused here
define(<LENGTH>,<%rcx>)
define(<DST>, <%r8>)
define(<SRC>, <%r9>)
C Round counter
define(<CNT>, <%rdx>)
C Subkey pointer
define(<KEY>, <%rax>)
dnl aesenc %xmm1, %xmm0
define(<AESENC>, <.byte 0x66, 0x0f, 0x38, 0xdc, 0xc1>)
dnl aesenclast %xmm1, %xmm0
define(<AESENCLAST>, <.byte 0x66, 0x0f, 0x38, 0xdd, 0xc1>)
.file "aes-encrypt-internal.asm"
C _aes_encrypt(unsigned rounds, const uint32_t *keys,
C const struct aes_table *T,
C size_t length, uint8_t *dst,
C uint8_t *src)
.text
ALIGN(16)
PROLOGUE(_nettle_aes_encrypt)
W64_ENTRY(6, 2)
shr $4, LENGTH
test LENGTH, LENGTH
jz .Lend
decl XREG(ROUNDS)
.Lblock_loop:
mov ROUNDS, CNT
mov KEYS, KEY
movups (SRC), %xmm0
C FIXME: Better alignment of subkeys, so we can use movaps.
movups (KEY), %xmm1
pxor %xmm1, %xmm0
C FIXME: Could use some unrolling. Also all subkeys fit in
C registers, so they could be loaded once (on W64 we would
C need to save and restore some xmm registers, though).
.Lround_loop:
add $16, KEY
movups (KEY), %xmm1
AESENC C %xmm1, %xmm0
decl XREG(CNT)
jnz .Lround_loop
movups 16(KEY), %xmm1
AESENCLAST C %xmm1, %xmm0
movups %xmm0, (DST)
add $16, SRC
add $16, DST
dec LENGTH
jnz .Lblock_loop
.Lend:
W64_EXIT(6, 2)
ret
EPILOGUE(_nettle_aes_encrypt)
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