318 строки
7.3 KiB
ArmAsm
318 строки
7.3 KiB
ArmAsm
/* twofish-aarch64.S - ARMv8/AArch64 assembly implementation of Twofish cipher
|
|
*
|
|
* Copyright (C) 2016 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 <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <config.h>
|
|
|
|
#if defined(__AARCH64EL__)
|
|
#ifdef HAVE_COMPATIBLE_GCC_AARCH64_PLATFORM_AS
|
|
|
|
.text
|
|
|
|
/* structure of TWOFISH_context: */
|
|
#define s0 0
|
|
#define s1 ((s0) + 4 * 256)
|
|
#define s2 ((s1) + 4 * 256)
|
|
#define s3 ((s2) + 4 * 256)
|
|
#define w ((s3) + 4 * 256)
|
|
#define k ((w) + 4 * 8)
|
|
|
|
/* register macros */
|
|
#define CTX x0
|
|
#define RDST x1
|
|
#define RSRC x2
|
|
#define CTXs0 CTX
|
|
#define CTXs1 x3
|
|
#define CTXs2 x4
|
|
#define CTXs3 x5
|
|
#define CTXw x17
|
|
|
|
#define RA w6
|
|
#define RB w7
|
|
#define RC w8
|
|
#define RD w9
|
|
|
|
#define RX w10
|
|
#define RY w11
|
|
|
|
#define xRX x10
|
|
#define xRY x11
|
|
|
|
#define RMASK w12
|
|
|
|
#define RT0 w13
|
|
#define RT1 w14
|
|
#define RT2 w15
|
|
#define RT3 w16
|
|
|
|
#define xRT0 x13
|
|
#define xRT1 x14
|
|
#define xRT2 x15
|
|
#define xRT3 x16
|
|
|
|
/* helper macros */
|
|
#ifndef __AARCH64EL__
|
|
/* bswap on big-endian */
|
|
#define host_to_le(reg) \
|
|
rev reg, reg;
|
|
#define le_to_host(reg) \
|
|
rev reg, reg;
|
|
#else
|
|
/* nop on little-endian */
|
|
#define host_to_le(reg) /*_*/
|
|
#define le_to_host(reg) /*_*/
|
|
#endif
|
|
|
|
#define ldr_input_aligned_le(rin, a, b, c, d) \
|
|
ldr a, [rin, #0]; \
|
|
ldr b, [rin, #4]; \
|
|
le_to_host(a); \
|
|
ldr c, [rin, #8]; \
|
|
le_to_host(b); \
|
|
ldr d, [rin, #12]; \
|
|
le_to_host(c); \
|
|
le_to_host(d);
|
|
|
|
#define str_output_aligned_le(rout, a, b, c, d) \
|
|
le_to_host(a); \
|
|
le_to_host(b); \
|
|
str a, [rout, #0]; \
|
|
le_to_host(c); \
|
|
str b, [rout, #4]; \
|
|
le_to_host(d); \
|
|
str c, [rout, #8]; \
|
|
str d, [rout, #12];
|
|
|
|
/* unaligned word reads/writes allowed */
|
|
#define ldr_input_le(rin, ra, rb, rc, rd, rtmp) \
|
|
ldr_input_aligned_le(rin, ra, rb, rc, rd)
|
|
|
|
#define str_output_le(rout, ra, rb, rc, rd, rtmp0, rtmp1) \
|
|
str_output_aligned_le(rout, ra, rb, rc, rd)
|
|
|
|
/**********************************************************************
|
|
1-way twofish
|
|
**********************************************************************/
|
|
#define encrypt_round(a, b, rc, rd, n, ror_a, adj_a) \
|
|
and RT0, RMASK, b, lsr#(8 - 2); \
|
|
and RY, RMASK, b, lsr#(16 - 2); \
|
|
and RT1, RMASK, b, lsr#(24 - 2); \
|
|
ldr RY, [CTXs3, xRY]; \
|
|
and RT2, RMASK, b, lsl#(2); \
|
|
ldr RT0, [CTXs2, xRT0]; \
|
|
and RT3, RMASK, a, lsr#(16 - 2 + (adj_a)); \
|
|
ldr RT1, [CTXs0, xRT1]; \
|
|
and RX, RMASK, a, lsr#(8 - 2 + (adj_a)); \
|
|
ldr RT2, [CTXs1, xRT2]; \
|
|
ldr RX, [CTXs1, xRX]; \
|
|
ror_a(a); \
|
|
\
|
|
eor RY, RY, RT0; \
|
|
ldr RT3, [CTXs2, xRT3]; \
|
|
and RT0, RMASK, a, lsl#(2); \
|
|
eor RY, RY, RT1; \
|
|
and RT1, RMASK, a, lsr#(24 - 2); \
|
|
eor RY, RY, RT2; \
|
|
ldr RT0, [CTXs0, xRT0]; \
|
|
eor RX, RX, RT3; \
|
|
ldr RT1, [CTXs3, xRT1]; \
|
|
eor RX, RX, RT0; \
|
|
\
|
|
ldr RT3, [CTXs3, #(k - s3 + 8 * (n) + 4)]; \
|
|
eor RX, RX, RT1; \
|
|
ldr RT2, [CTXs3, #(k - s3 + 8 * (n))]; \
|
|
\
|
|
add RT0, RX, RY, lsl #1; \
|
|
add RX, RX, RY; \
|
|
add RT0, RT0, RT3; \
|
|
add RX, RX, RT2; \
|
|
eor rd, RT0, rd, ror #31; \
|
|
eor rc, rc, RX;
|
|
|
|
#define dummy(x) /*_*/
|
|
|
|
#define ror1(r) \
|
|
ror r, r, #1;
|
|
|
|
#define decrypt_round(a, b, rc, rd, n, ror_b, adj_b) \
|
|
and RT3, RMASK, b, lsl#(2 - (adj_b)); \
|
|
and RT1, RMASK, b, lsr#(8 - 2 + (adj_b)); \
|
|
ror_b(b); \
|
|
and RT2, RMASK, a, lsl#(2); \
|
|
and RT0, RMASK, a, lsr#(8 - 2); \
|
|
\
|
|
ldr RY, [CTXs1, xRT3]; \
|
|
ldr RX, [CTXs0, xRT2]; \
|
|
and RT3, RMASK, b, lsr#(16 - 2); \
|
|
ldr RT1, [CTXs2, xRT1]; \
|
|
and RT2, RMASK, a, lsr#(16 - 2); \
|
|
ldr RT0, [CTXs1, xRT0]; \
|
|
\
|
|
ldr RT3, [CTXs3, xRT3]; \
|
|
eor RY, RY, RT1; \
|
|
\
|
|
and RT1, RMASK, b, lsr#(24 - 2); \
|
|
eor RX, RX, RT0; \
|
|
ldr RT2, [CTXs2, xRT2]; \
|
|
and RT0, RMASK, a, lsr#(24 - 2); \
|
|
\
|
|
ldr RT1, [CTXs0, xRT1]; \
|
|
\
|
|
eor RY, RY, RT3; \
|
|
ldr RT0, [CTXs3, xRT0]; \
|
|
eor RX, RX, RT2; \
|
|
eor RY, RY, RT1; \
|
|
\
|
|
ldr RT1, [CTXs3, #(k - s3 + 8 * (n) + 4)]; \
|
|
eor RX, RX, RT0; \
|
|
ldr RT2, [CTXs3, #(k - s3 + 8 * (n))]; \
|
|
\
|
|
add RT0, RX, RY, lsl #1; \
|
|
add RX, RX, RY; \
|
|
add RT0, RT0, RT1; \
|
|
add RX, RX, RT2; \
|
|
eor rd, rd, RT0; \
|
|
eor rc, RX, rc, ror #31;
|
|
|
|
#define first_encrypt_cycle(nc) \
|
|
encrypt_round(RA, RB, RC, RD, (nc) * 2, dummy, 0); \
|
|
encrypt_round(RC, RD, RA, RB, (nc) * 2 + 1, ror1, 1);
|
|
|
|
#define encrypt_cycle(nc) \
|
|
encrypt_round(RA, RB, RC, RD, (nc) * 2, ror1, 1); \
|
|
encrypt_round(RC, RD, RA, RB, (nc) * 2 + 1, ror1, 1);
|
|
|
|
#define last_encrypt_cycle(nc) \
|
|
encrypt_round(RA, RB, RC, RD, (nc) * 2, ror1, 1); \
|
|
encrypt_round(RC, RD, RA, RB, (nc) * 2 + 1, ror1, 1); \
|
|
ror1(RA);
|
|
|
|
#define first_decrypt_cycle(nc) \
|
|
decrypt_round(RC, RD, RA, RB, (nc) * 2 + 1, dummy, 0); \
|
|
decrypt_round(RA, RB, RC, RD, (nc) * 2, ror1, 1);
|
|
|
|
#define decrypt_cycle(nc) \
|
|
decrypt_round(RC, RD, RA, RB, (nc) * 2 + 1, ror1, 1); \
|
|
decrypt_round(RA, RB, RC, RD, (nc) * 2, ror1, 1);
|
|
|
|
#define last_decrypt_cycle(nc) \
|
|
decrypt_round(RC, RD, RA, RB, (nc) * 2 + 1, ror1, 1); \
|
|
decrypt_round(RA, RB, RC, RD, (nc) * 2, ror1, 1); \
|
|
ror1(RD);
|
|
|
|
.globl _gcry_twofish_arm_encrypt_block
|
|
.type _gcry_twofish_arm_encrypt_block,%function;
|
|
|
|
_gcry_twofish_arm_encrypt_block:
|
|
/* input:
|
|
* x0: ctx
|
|
* x1: dst
|
|
* x2: src
|
|
*/
|
|
|
|
add CTXw, CTX, #(w);
|
|
|
|
ldr_input_le(RSRC, RA, RB, RC, RD, RT0);
|
|
|
|
/* Input whitening */
|
|
ldp RT0, RT1, [CTXw, #(0*8)];
|
|
ldp RT2, RT3, [CTXw, #(1*8)];
|
|
add CTXs3, CTX, #(s3);
|
|
add CTXs2, CTX, #(s2);
|
|
add CTXs1, CTX, #(s1);
|
|
mov RMASK, #(0xff << 2);
|
|
eor RA, RA, RT0;
|
|
eor RB, RB, RT1;
|
|
eor RC, RC, RT2;
|
|
eor RD, RD, RT3;
|
|
|
|
first_encrypt_cycle(0);
|
|
encrypt_cycle(1);
|
|
encrypt_cycle(2);
|
|
encrypt_cycle(3);
|
|
encrypt_cycle(4);
|
|
encrypt_cycle(5);
|
|
encrypt_cycle(6);
|
|
last_encrypt_cycle(7);
|
|
|
|
/* Output whitening */
|
|
ldp RT0, RT1, [CTXw, #(2*8)];
|
|
ldp RT2, RT3, [CTXw, #(3*8)];
|
|
eor RC, RC, RT0;
|
|
eor RD, RD, RT1;
|
|
eor RA, RA, RT2;
|
|
eor RB, RB, RT3;
|
|
|
|
str_output_le(RDST, RC, RD, RA, RB, RT0, RT1);
|
|
|
|
ret;
|
|
.ltorg
|
|
.size _gcry_twofish_arm_encrypt_block,.-_gcry_twofish_arm_encrypt_block;
|
|
|
|
.globl _gcry_twofish_arm_decrypt_block
|
|
.type _gcry_twofish_arm_decrypt_block,%function;
|
|
|
|
_gcry_twofish_arm_decrypt_block:
|
|
/* input:
|
|
* %r0: ctx
|
|
* %r1: dst
|
|
* %r2: src
|
|
*/
|
|
|
|
add CTXw, CTX, #(w);
|
|
|
|
ldr_input_le(RSRC, RC, RD, RA, RB, RT0);
|
|
|
|
/* Input whitening */
|
|
ldp RT0, RT1, [CTXw, #(2*8)];
|
|
ldp RT2, RT3, [CTXw, #(3*8)];
|
|
add CTXs3, CTX, #(s3);
|
|
add CTXs2, CTX, #(s2);
|
|
add CTXs1, CTX, #(s1);
|
|
mov RMASK, #(0xff << 2);
|
|
eor RC, RC, RT0;
|
|
eor RD, RD, RT1;
|
|
eor RA, RA, RT2;
|
|
eor RB, RB, RT3;
|
|
|
|
first_decrypt_cycle(7);
|
|
decrypt_cycle(6);
|
|
decrypt_cycle(5);
|
|
decrypt_cycle(4);
|
|
decrypt_cycle(3);
|
|
decrypt_cycle(2);
|
|
decrypt_cycle(1);
|
|
last_decrypt_cycle(0);
|
|
|
|
/* Output whitening */
|
|
ldp RT0, RT1, [CTXw, #(0*8)];
|
|
ldp RT2, RT3, [CTXw, #(1*8)];
|
|
eor RA, RA, RT0;
|
|
eor RB, RB, RT1;
|
|
eor RC, RC, RT2;
|
|
eor RD, RD, RT3;
|
|
|
|
str_output_le(RDST, RA, RB, RC, RD, RT0, RT1);
|
|
|
|
ret;
|
|
.size _gcry_twofish_arm_decrypt_block,.-_gcry_twofish_arm_decrypt_block;
|
|
|
|
#endif /*HAVE_COMPATIBLE_GCC_AARCH64_PLATFORM_AS*/
|
|
#endif /*__AARCH64EL__*/
|