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C x86_64/chacha-core-internal.asm
ifelse(<
Copyright (C) 2012, 2014 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/.
>)
define(<DST>, <%rdi>)
define(<SRC>, <%rsi>)
define(<COUNT>, <%rdx>)
define(<X0>, <%xmm0>)
define(<X1>, <%xmm1>)
define(<X2>, <%xmm2>)
define(<X3>, <%xmm3>)
define(<T0>, <%xmm4>)
define(<T1>, <%xmm5>)
define(<USE_PSHUFW>, <yes>)
C ROTL_BY_16(REG, TMP)
ifelse(USE_PSHUFW, <yes>, <
define(<ROTL_BY_16>, <
pshufhw <$>0xb1, $1, $1
pshuflw <$>0xb1, $1, $1
>)>, <
define(<ROTL_BY_16>, <
pslld <$>16, $1
psrld <$>16, $2
por $2, $1
>)
>)
C QROUND
define(<QROUND>, <
paddd X1, X0
pxor X0, X3
movaps X3, T0
ROTL_BY_16(X3, T0)
paddd X3, X2
pxor X2, X1
movaps X1, T0
pslld <$>12, X1
psrld <$>20, T0
por T0, X1
paddd X1, X0
pxor X0, X3
movaps X3, T0
pslld <$>8, X3
psrld <$>24, T0
por T0, X3
paddd X3, X2
pxor X2, X1
movaps X1, T0
pslld <$>7, X1
psrld <$>25, T0
por T0, X1
>)
C _chacha_core(uint32_t *dst, const uint32_t *src, unsigned rounds)
.text
ALIGN(16)
PROLOGUE(_nettle_chacha_core)
W64_ENTRY(3, 6)
movups (SRC), X0
movups 16(SRC), X1
movups 32(SRC), X2
movups 48(SRC), X3
shrl $1, XREG(COUNT)
ALIGN(16)
.Loop:
QROUND(X0, X1, X2, X3)
pshufd $0x39, X1, X1
pshufd $0x4e, X2, X2
pshufd $0x93, X3, X3
QROUND(X0, X1, X2, X3)
pshufd $0x93, X1, X1
pshufd $0x4e, X2, X2
pshufd $0x39, X3, X3
decl XREG(COUNT)
jnz .Loop
movups (SRC), T0
movups 16(SRC), T1
paddd T0, X0
paddd T1, X1
movups X0,(DST)
movups X1,16(DST)
movups 32(SRC), T0
movups 48(SRC), T1
paddd T0, X2
paddd T1, X3
movups X2,32(DST)
movups X3,48(DST)
W64_EXIT(3, 6)
ret
EPILOGUE(_nettle_chacha_core)
|
