mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 07:20:53 +07:00
a00fa0c887
Add an ARM64 NEON implementation of NHPoly1305, an ε-almost-∆-universal hash function used in the Adiantum encryption mode. For now, only the NH portion is actually NEON-accelerated; the Poly1305 part is less performance-critical so is just implemented in C. Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> # big-endian Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
104 lines
2.1 KiB
ArmAsm
104 lines
2.1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* NH - ε-almost-universal hash function, ARM64 NEON accelerated version
|
|
*
|
|
* Copyright 2018 Google LLC
|
|
*
|
|
* Author: Eric Biggers <ebiggers@google.com>
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
|
|
KEY .req x0
|
|
MESSAGE .req x1
|
|
MESSAGE_LEN .req x2
|
|
HASH .req x3
|
|
|
|
PASS0_SUMS .req v0
|
|
PASS1_SUMS .req v1
|
|
PASS2_SUMS .req v2
|
|
PASS3_SUMS .req v3
|
|
K0 .req v4
|
|
K1 .req v5
|
|
K2 .req v6
|
|
K3 .req v7
|
|
T0 .req v8
|
|
T1 .req v9
|
|
T2 .req v10
|
|
T3 .req v11
|
|
T4 .req v12
|
|
T5 .req v13
|
|
T6 .req v14
|
|
T7 .req v15
|
|
|
|
.macro _nh_stride k0, k1, k2, k3
|
|
|
|
// Load next message stride
|
|
ld1 {T3.16b}, [MESSAGE], #16
|
|
|
|
// Load next key stride
|
|
ld1 {\k3\().4s}, [KEY], #16
|
|
|
|
// Add message words to key words
|
|
add T0.4s, T3.4s, \k0\().4s
|
|
add T1.4s, T3.4s, \k1\().4s
|
|
add T2.4s, T3.4s, \k2\().4s
|
|
add T3.4s, T3.4s, \k3\().4s
|
|
|
|
// Multiply 32x32 => 64 and accumulate
|
|
mov T4.d[0], T0.d[1]
|
|
mov T5.d[0], T1.d[1]
|
|
mov T6.d[0], T2.d[1]
|
|
mov T7.d[0], T3.d[1]
|
|
umlal PASS0_SUMS.2d, T0.2s, T4.2s
|
|
umlal PASS1_SUMS.2d, T1.2s, T5.2s
|
|
umlal PASS2_SUMS.2d, T2.2s, T6.2s
|
|
umlal PASS3_SUMS.2d, T3.2s, T7.2s
|
|
.endm
|
|
|
|
/*
|
|
* void nh_neon(const u32 *key, const u8 *message, size_t message_len,
|
|
* u8 hash[NH_HASH_BYTES])
|
|
*
|
|
* It's guaranteed that message_len % 16 == 0.
|
|
*/
|
|
ENTRY(nh_neon)
|
|
|
|
ld1 {K0.4s,K1.4s}, [KEY], #32
|
|
movi PASS0_SUMS.2d, #0
|
|
movi PASS1_SUMS.2d, #0
|
|
ld1 {K2.4s}, [KEY], #16
|
|
movi PASS2_SUMS.2d, #0
|
|
movi PASS3_SUMS.2d, #0
|
|
|
|
subs MESSAGE_LEN, MESSAGE_LEN, #64
|
|
blt .Lloop4_done
|
|
.Lloop4:
|
|
_nh_stride K0, K1, K2, K3
|
|
_nh_stride K1, K2, K3, K0
|
|
_nh_stride K2, K3, K0, K1
|
|
_nh_stride K3, K0, K1, K2
|
|
subs MESSAGE_LEN, MESSAGE_LEN, #64
|
|
bge .Lloop4
|
|
|
|
.Lloop4_done:
|
|
ands MESSAGE_LEN, MESSAGE_LEN, #63
|
|
beq .Ldone
|
|
_nh_stride K0, K1, K2, K3
|
|
|
|
subs MESSAGE_LEN, MESSAGE_LEN, #16
|
|
beq .Ldone
|
|
_nh_stride K1, K2, K3, K0
|
|
|
|
subs MESSAGE_LEN, MESSAGE_LEN, #16
|
|
beq .Ldone
|
|
_nh_stride K2, K3, K0, K1
|
|
|
|
.Ldone:
|
|
// Sum the accumulators for each pass, then store the sums to 'hash'
|
|
addp T0.2d, PASS0_SUMS.2d, PASS1_SUMS.2d
|
|
addp T1.2d, PASS2_SUMS.2d, PASS3_SUMS.2d
|
|
st1 {T0.16b,T1.16b}, [HASH]
|
|
ret
|
|
ENDPROC(nh_neon)
|