linux/crypto/aegis128-neon-inner.c
Ard Biesheuvel 528282630c crypto: aegis128 - duplicate init() and final() hooks in SIMD code
In order to speed up aegis128 processing even more, duplicate the init()
and final() routines as SIMD versions in their entirety. This results
in a 2x speedup on ARM Cortex-A57 for ~1500 byte packets (using AES
instructions).

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-10-26 02:06:05 +11:00

263 lines
6.3 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2019 Linaro, Ltd. <ard.biesheuvel@linaro.org>
*/
#ifdef CONFIG_ARM64
#include <asm/neon-intrinsics.h>
#define AES_ROUND "aese %0.16b, %1.16b \n\t aesmc %0.16b, %0.16b"
#else
#include <arm_neon.h>
#define AES_ROUND "aese.8 %q0, %q1 \n\t aesmc.8 %q0, %q0"
#endif
#define AEGIS_BLOCK_SIZE 16
#include <stddef.h>
extern int aegis128_have_aes_insn;
void *memcpy(void *dest, const void *src, size_t n);
void *memset(void *s, int c, size_t n);
struct aegis128_state {
uint8x16_t v[5];
};
extern const uint8_t crypto_aes_sbox[];
static struct aegis128_state aegis128_load_state_neon(const void *state)
{
return (struct aegis128_state){ {
vld1q_u8(state),
vld1q_u8(state + 16),
vld1q_u8(state + 32),
vld1q_u8(state + 48),
vld1q_u8(state + 64)
} };
}
static void aegis128_save_state_neon(struct aegis128_state st, void *state)
{
vst1q_u8(state, st.v[0]);
vst1q_u8(state + 16, st.v[1]);
vst1q_u8(state + 32, st.v[2]);
vst1q_u8(state + 48, st.v[3]);
vst1q_u8(state + 64, st.v[4]);
}
static inline __attribute__((always_inline))
uint8x16_t aegis_aes_round(uint8x16_t w)
{
uint8x16_t z = {};
#ifdef CONFIG_ARM64
if (!__builtin_expect(aegis128_have_aes_insn, 1)) {
static const uint8_t shift_rows[] = {
0x0, 0x5, 0xa, 0xf, 0x4, 0x9, 0xe, 0x3,
0x8, 0xd, 0x2, 0x7, 0xc, 0x1, 0x6, 0xb,
};
static const uint8_t ror32by8[] = {
0x1, 0x2, 0x3, 0x0, 0x5, 0x6, 0x7, 0x4,
0x9, 0xa, 0xb, 0x8, 0xd, 0xe, 0xf, 0xc,
};
uint8x16_t v;
// shift rows
w = vqtbl1q_u8(w, vld1q_u8(shift_rows));
// sub bytes
#ifndef CONFIG_CC_IS_GCC
v = vqtbl4q_u8(vld1q_u8_x4(crypto_aes_sbox), w);
v = vqtbx4q_u8(v, vld1q_u8_x4(crypto_aes_sbox + 0x40), w - 0x40);
v = vqtbx4q_u8(v, vld1q_u8_x4(crypto_aes_sbox + 0x80), w - 0x80);
v = vqtbx4q_u8(v, vld1q_u8_x4(crypto_aes_sbox + 0xc0), w - 0xc0);
#else
asm("tbl %0.16b, {v16.16b-v19.16b}, %1.16b" : "=w"(v) : "w"(w));
w -= 0x40;
asm("tbx %0.16b, {v20.16b-v23.16b}, %1.16b" : "+w"(v) : "w"(w));
w -= 0x40;
asm("tbx %0.16b, {v24.16b-v27.16b}, %1.16b" : "+w"(v) : "w"(w));
w -= 0x40;
asm("tbx %0.16b, {v28.16b-v31.16b}, %1.16b" : "+w"(v) : "w"(w));
#endif
// mix columns
w = (v << 1) ^ (uint8x16_t)(((int8x16_t)v >> 7) & 0x1b);
w ^= (uint8x16_t)vrev32q_u16((uint16x8_t)v);
w ^= vqtbl1q_u8(v ^ w, vld1q_u8(ror32by8));
return w;
}
#endif
/*
* We use inline asm here instead of the vaeseq_u8/vaesmcq_u8 intrinsics
* to force the compiler to issue the aese/aesmc instructions in pairs.
* This is much faster on many cores, where the instruction pair can
* execute in a single cycle.
*/
asm(AES_ROUND : "+w"(w) : "w"(z));
return w;
}
static inline __attribute__((always_inline))
struct aegis128_state aegis128_update_neon(struct aegis128_state st,
uint8x16_t m)
{
m ^= aegis_aes_round(st.v[4]);
st.v[4] ^= aegis_aes_round(st.v[3]);
st.v[3] ^= aegis_aes_round(st.v[2]);
st.v[2] ^= aegis_aes_round(st.v[1]);
st.v[1] ^= aegis_aes_round(st.v[0]);
st.v[0] ^= m;
return st;
}
static inline __attribute__((always_inline))
void preload_sbox(void)
{
if (!IS_ENABLED(CONFIG_ARM64) ||
!IS_ENABLED(CONFIG_CC_IS_GCC) ||
__builtin_expect(aegis128_have_aes_insn, 1))
return;
asm("ld1 {v16.16b-v19.16b}, [%0], #64 \n\t"
"ld1 {v20.16b-v23.16b}, [%0], #64 \n\t"
"ld1 {v24.16b-v27.16b}, [%0], #64 \n\t"
"ld1 {v28.16b-v31.16b}, [%0] \n\t"
:: "r"(crypto_aes_sbox));
}
void crypto_aegis128_init_neon(void *state, const void *key, const void *iv)
{
static const uint8_t const0[] = {
0x00, 0x01, 0x01, 0x02, 0x03, 0x05, 0x08, 0x0d,
0x15, 0x22, 0x37, 0x59, 0x90, 0xe9, 0x79, 0x62,
};
static const uint8_t const1[] = {
0xdb, 0x3d, 0x18, 0x55, 0x6d, 0xc2, 0x2f, 0xf1,
0x20, 0x11, 0x31, 0x42, 0x73, 0xb5, 0x28, 0xdd,
};
uint8x16_t k = vld1q_u8(key);
uint8x16_t kiv = k ^ vld1q_u8(iv);
struct aegis128_state st = {{
kiv,
vld1q_u8(const1),
vld1q_u8(const0),
k ^ vld1q_u8(const0),
k ^ vld1q_u8(const1),
}};
int i;
preload_sbox();
for (i = 0; i < 5; i++) {
st = aegis128_update_neon(st, k);
st = aegis128_update_neon(st, kiv);
}
aegis128_save_state_neon(st, state);
}
void crypto_aegis128_update_neon(void *state, const void *msg)
{
struct aegis128_state st = aegis128_load_state_neon(state);
preload_sbox();
st = aegis128_update_neon(st, vld1q_u8(msg));
aegis128_save_state_neon(st, state);
}
void crypto_aegis128_encrypt_chunk_neon(void *state, void *dst, const void *src,
unsigned int size)
{
struct aegis128_state st = aegis128_load_state_neon(state);
uint8x16_t msg;
preload_sbox();
while (size >= AEGIS_BLOCK_SIZE) {
uint8x16_t s = st.v[1] ^ (st.v[2] & st.v[3]) ^ st.v[4];
msg = vld1q_u8(src);
st = aegis128_update_neon(st, msg);
vst1q_u8(dst, msg ^ s);
size -= AEGIS_BLOCK_SIZE;
src += AEGIS_BLOCK_SIZE;
dst += AEGIS_BLOCK_SIZE;
}
if (size > 0) {
uint8x16_t s = st.v[1] ^ (st.v[2] & st.v[3]) ^ st.v[4];
uint8_t buf[AEGIS_BLOCK_SIZE] = {};
memcpy(buf, src, size);
msg = vld1q_u8(buf);
st = aegis128_update_neon(st, msg);
vst1q_u8(buf, msg ^ s);
memcpy(dst, buf, size);
}
aegis128_save_state_neon(st, state);
}
void crypto_aegis128_decrypt_chunk_neon(void *state, void *dst, const void *src,
unsigned int size)
{
struct aegis128_state st = aegis128_load_state_neon(state);
uint8x16_t msg;
preload_sbox();
while (size >= AEGIS_BLOCK_SIZE) {
msg = vld1q_u8(src) ^ st.v[1] ^ (st.v[2] & st.v[3]) ^ st.v[4];
st = aegis128_update_neon(st, msg);
vst1q_u8(dst, msg);
size -= AEGIS_BLOCK_SIZE;
src += AEGIS_BLOCK_SIZE;
dst += AEGIS_BLOCK_SIZE;
}
if (size > 0) {
uint8x16_t s = st.v[1] ^ (st.v[2] & st.v[3]) ^ st.v[4];
uint8_t buf[AEGIS_BLOCK_SIZE];
vst1q_u8(buf, s);
memcpy(buf, src, size);
msg = vld1q_u8(buf) ^ s;
vst1q_u8(buf, msg);
memcpy(dst, buf, size);
st = aegis128_update_neon(st, msg);
}
aegis128_save_state_neon(st, state);
}
void crypto_aegis128_final_neon(void *state, void *tag_xor, uint64_t assoclen,
uint64_t cryptlen)
{
struct aegis128_state st = aegis128_load_state_neon(state);
uint8x16_t v;
int i;
preload_sbox();
v = st.v[3] ^ (uint8x16_t)vcombine_u64(vmov_n_u64(8 * assoclen),
vmov_n_u64(8 * cryptlen));
for (i = 0; i < 7; i++)
st = aegis128_update_neon(st, v);
v = vld1q_u8(tag_xor);
v ^= st.v[0] ^ st.v[1] ^ st.v[2] ^ st.v[3] ^ st.v[4];
vst1q_u8(tag_xor, v);
}