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/* Optimized SSE2 implementation of ChaCha20 cipher.
Copyright (C) 2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* chacha20-amd64-ssse3.S - SSSE3 implementation of ChaCha20 cipher
Copyright (C) 2017-2019 Jussi Kivilinna <jussi.kivilinna@iki.fi>
This file is part of Libgcrypt.
Libgcrypt is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of
the License, or (at your option) any later version.
Libgcrypt 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this program; if not, see <https://www.gnu.org/licenses/>.
*/
/* Based on D. J. Bernstein reference implementation at
http://cr.yp.to/chacha.html:
chacha-regs.c version 20080118
D. J. Bernstein
Public domain. */
#include <sysdep.h>
#include <isa-level.h>
#if MINIMUM_X86_ISA_LEVEL <= 2
#ifdef PIC
# define rRIP (%rip)
#else
# define rRIP
#endif
/* 'ret' instruction replacement for straight-line speculation mitigation */
#define ret_spec_stop \
ret; int3;
/* register macros */
#define INPUT %rdi
#define DST %rsi
#define SRC %rdx
#define NBLKS %rcx
#define ROUND %eax
/* stack structure */
#define STACK_VEC_X12 (16)
#define STACK_VEC_X13 (16 + STACK_VEC_X12)
#define STACK_TMP (16 + STACK_VEC_X13)
#define STACK_TMP1 (16 + STACK_TMP)
#define STACK_TMP2 (16 + STACK_TMP1)
#define STACK_MAX (16 + STACK_TMP2)
/* vector registers */
#define X0 %xmm0
#define X1 %xmm1
#define X2 %xmm2
#define X3 %xmm3
#define X4 %xmm4
#define X5 %xmm5
#define X6 %xmm6
#define X7 %xmm7
#define X8 %xmm8
#define X9 %xmm9
#define X10 %xmm10
#define X11 %xmm11
#define X12 %xmm12
#define X13 %xmm13
#define X14 %xmm14
#define X15 %xmm15
/**********************************************************************
helper macros
**********************************************************************/
/* 4x4 32-bit integer matrix transpose */
#define TRANSPOSE_4x4(x0, x1, x2, x3, t1, t2, t3) \
movdqa x0, t2; \
punpckhdq x1, t2; \
punpckldq x1, x0; \
\
movdqa x2, t1; \
punpckldq x3, t1; \
punpckhdq x3, x2; \
\
movdqa x0, x1; \
punpckhqdq t1, x1; \
punpcklqdq t1, x0; \
\
movdqa t2, x3; \
punpckhqdq x2, x3; \
punpcklqdq x2, t2; \
movdqa t2, x2;
/* fill xmm register with 32-bit value from memory */
#define PBROADCASTD(mem32, xreg) \
movd mem32, xreg; \
pshufd $0, xreg, xreg;
/**********************************************************************
4-way chacha20
**********************************************************************/
#define ROTATE2(v1,v2,c,tmp1,tmp2) \
movdqa v1, tmp1; \
movdqa v2, tmp2; \
psrld $(32 - (c)), v1; \
pslld $(c), tmp1; \
paddb tmp1, v1; \
psrld $(32 - (c)), v2; \
pslld $(c), tmp2; \
paddb tmp2, v2;
#define XOR(ds,s) \
pxor s, ds;
#define PLUS(ds,s) \
paddd s, ds;
#define QUARTERROUND2(a1,b1,c1,d1,a2,b2,c2,d2,ign,tmp1,tmp2) \
PLUS(a1,b1); PLUS(a2,b2); XOR(d1,a1); XOR(d2,a2); \
ROTATE2(d1, d2, 16, tmp1, tmp2); \
PLUS(c1,d1); PLUS(c2,d2); XOR(b1,c1); XOR(b2,c2); \
ROTATE2(b1, b2, 12, tmp1, tmp2); \
PLUS(a1,b1); PLUS(a2,b2); XOR(d1,a1); XOR(d2,a2); \
ROTATE2(d1, d2, 8, tmp1, tmp2); \
PLUS(c1,d1); PLUS(c2,d2); XOR(b1,c1); XOR(b2,c2); \
ROTATE2(b1, b2, 7, tmp1, tmp2);
.section .text.sse2,"ax",@progbits
chacha20_data:
.align 16
L(counter1):
.long 1,0,0,0
L(inc_counter):
.long 0,1,2,3
L(unsigned_cmp):
.long 0x80000000,0x80000000,0x80000000,0x80000000
.hidden __chacha20_sse2_blocks4
ENTRY (__chacha20_sse2_blocks4)
/* input:
* %rdi: input
* %rsi: dst
* %rdx: src
* %rcx: nblks (multiple of 4)
*/
pushq %rbp;
cfi_adjust_cfa_offset(8);
cfi_rel_offset(rbp, 0)
movq %rsp, %rbp;
cfi_def_cfa_register(%rbp);
subq $STACK_MAX, %rsp;
andq $~15, %rsp;
L(loop4):
mov $20, ROUND;
/* Construct counter vectors X12 and X13 */
movdqa L(inc_counter) rRIP, X0;
movdqa L(unsigned_cmp) rRIP, X2;
PBROADCASTD((12 * 4)(INPUT), X12);
PBROADCASTD((13 * 4)(INPUT), X13);
paddd X0, X12;
movdqa X12, X1;
pxor X2, X0;
pxor X2, X1;
pcmpgtd X1, X0;
psubd X0, X13;
movdqa X12, (STACK_VEC_X12)(%rsp);
movdqa X13, (STACK_VEC_X13)(%rsp);
/* Load vectors */
PBROADCASTD((0 * 4)(INPUT), X0);
PBROADCASTD((1 * 4)(INPUT), X1);
PBROADCASTD((2 * 4)(INPUT), X2);
PBROADCASTD((3 * 4)(INPUT), X3);
PBROADCASTD((4 * 4)(INPUT), X4);
PBROADCASTD((5 * 4)(INPUT), X5);
PBROADCASTD((6 * 4)(INPUT), X6);
PBROADCASTD((7 * 4)(INPUT), X7);
PBROADCASTD((8 * 4)(INPUT), X8);
PBROADCASTD((9 * 4)(INPUT), X9);
PBROADCASTD((10 * 4)(INPUT), X10);
PBROADCASTD((11 * 4)(INPUT), X11);
PBROADCASTD((14 * 4)(INPUT), X14);
PBROADCASTD((15 * 4)(INPUT), X15);
movdqa X11, (STACK_TMP)(%rsp);
movdqa X15, (STACK_TMP1)(%rsp);
L(round2_4):
QUARTERROUND2(X0, X4, X8, X12, X1, X5, X9, X13, tmp:=,X11,X15)
movdqa (STACK_TMP)(%rsp), X11;
movdqa (STACK_TMP1)(%rsp), X15;
movdqa X8, (STACK_TMP)(%rsp);
movdqa X9, (STACK_TMP1)(%rsp);
QUARTERROUND2(X2, X6, X10, X14, X3, X7, X11, X15, tmp:=,X8,X9)
QUARTERROUND2(X0, X5, X10, X15, X1, X6, X11, X12, tmp:=,X8,X9)
movdqa (STACK_TMP)(%rsp), X8;
movdqa (STACK_TMP1)(%rsp), X9;
movdqa X11, (STACK_TMP)(%rsp);
movdqa X15, (STACK_TMP1)(%rsp);
QUARTERROUND2(X2, X7, X8, X13, X3, X4, X9, X14, tmp:=,X11,X15)
sub $2, ROUND;
jnz L(round2_4);
/* tmp := X15 */
movdqa (STACK_TMP)(%rsp), X11;
PBROADCASTD((0 * 4)(INPUT), X15);
PLUS(X0, X15);
PBROADCASTD((1 * 4)(INPUT), X15);
PLUS(X1, X15);
PBROADCASTD((2 * 4)(INPUT), X15);
PLUS(X2, X15);
PBROADCASTD((3 * 4)(INPUT), X15);
PLUS(X3, X15);
PBROADCASTD((4 * 4)(INPUT), X15);
PLUS(X4, X15);
PBROADCASTD((5 * 4)(INPUT), X15);
PLUS(X5, X15);
PBROADCASTD((6 * 4)(INPUT), X15);
PLUS(X6, X15);
PBROADCASTD((7 * 4)(INPUT), X15);
PLUS(X7, X15);
PBROADCASTD((8 * 4)(INPUT), X15);
PLUS(X8, X15);
PBROADCASTD((9 * 4)(INPUT), X15);
PLUS(X9, X15);
PBROADCASTD((10 * 4)(INPUT), X15);
PLUS(X10, X15);
PBROADCASTD((11 * 4)(INPUT), X15);
PLUS(X11, X15);
movdqa (STACK_VEC_X12)(%rsp), X15;
PLUS(X12, X15);
movdqa (STACK_VEC_X13)(%rsp), X15;
PLUS(X13, X15);
movdqa X13, (STACK_TMP)(%rsp);
PBROADCASTD((14 * 4)(INPUT), X15);
PLUS(X14, X15);
movdqa (STACK_TMP1)(%rsp), X15;
movdqa X14, (STACK_TMP1)(%rsp);
PBROADCASTD((15 * 4)(INPUT), X13);
PLUS(X15, X13);
movdqa X15, (STACK_TMP2)(%rsp);
/* Update counter */
addq $4, (12 * 4)(INPUT);
TRANSPOSE_4x4(X0, X1, X2, X3, X13, X14, X15);
movdqu X0, (64 * 0 + 16 * 0)(DST)
movdqu X1, (64 * 1 + 16 * 0)(DST)
movdqu X2, (64 * 2 + 16 * 0)(DST)
movdqu X3, (64 * 3 + 16 * 0)(DST)
TRANSPOSE_4x4(X4, X5, X6, X7, X0, X1, X2);
movdqa (STACK_TMP)(%rsp), X13;
movdqa (STACK_TMP1)(%rsp), X14;
movdqa (STACK_TMP2)(%rsp), X15;
movdqu X4, (64 * 0 + 16 * 1)(DST)
movdqu X5, (64 * 1 + 16 * 1)(DST)
movdqu X6, (64 * 2 + 16 * 1)(DST)
movdqu X7, (64 * 3 + 16 * 1)(DST)
TRANSPOSE_4x4(X8, X9, X10, X11, X0, X1, X2);
movdqu X8, (64 * 0 + 16 * 2)(DST)
movdqu X9, (64 * 1 + 16 * 2)(DST)
movdqu X10, (64 * 2 + 16 * 2)(DST)
movdqu X11, (64 * 3 + 16 * 2)(DST)
TRANSPOSE_4x4(X12, X13, X14, X15, X0, X1, X2);
movdqu X12, (64 * 0 + 16 * 3)(DST)
movdqu X13, (64 * 1 + 16 * 3)(DST)
movdqu X14, (64 * 2 + 16 * 3)(DST)
movdqu X15, (64 * 3 + 16 * 3)(DST)
sub $4, NBLKS;
lea (4 * 64)(DST), DST;
lea (4 * 64)(SRC), SRC;
jnz L(loop4);
/* eax zeroed by round loop. */
leave;
cfi_adjust_cfa_offset(-8)
cfi_def_cfa_register(%rsp);
ret_spec_stop;
END (__chacha20_sse2_blocks4)
#endif /* if MINIMUM_X86_ISA_LEVEL <= 2 */
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