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crypto: aegis128 - duplicate init() and final() hooks in SIMD code

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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>
This commit is contained in:
Ard Biesheuvel 2019-10-14 18:16:45 +02:00 committed by Herbert Xu
parent 2698bce1f0
commit 528282630c
3 changed files with 97 additions and 12 deletions
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38
crypto/aegis128-core.c
View File

@ -60,10 +60,16 @@ static bool aegis128_do_simd(void)
bool crypto_aegis128_have_simd(void);
void crypto_aegis128_update_simd(struct aegis_state *state, const void *msg);
void crypto_aegis128_init_simd(struct aegis_state *state,
const union aegis_block *key,
const u8 *iv);
void crypto_aegis128_encrypt_chunk_simd(struct aegis_state *state, u8 *dst,
const u8 *src, unsigned int size);
void crypto_aegis128_decrypt_chunk_simd(struct aegis_state *state, u8 *dst,
const u8 *src, unsigned int size);
void crypto_aegis128_final_simd(struct aegis_state *state,
union aegis_block *tag_xor,
u64 assoclen, u64 cryptlen);
static void crypto_aegis128_update(struct aegis_state *state)
{
@ -395,17 +401,21 @@ static int crypto_aegis128_encrypt(struct aead_request *req)
struct skcipher_walk walk;
struct aegis_state state;
crypto_aegis128_init(&state, &ctx->key, req->iv);
crypto_aegis128_process_ad(&state, req->src, req->assoclen);
skcipher_walk_aead_encrypt(&walk, req, false);
if (aegis128_do_simd())
if (aegis128_do_simd()) {
crypto_aegis128_init_simd(&state, &ctx->key, req->iv);
crypto_aegis128_process_ad(&state, req->src, req->assoclen);
crypto_aegis128_process_crypt(&state, req, &walk,
crypto_aegis128_encrypt_chunk_simd);
else
crypto_aegis128_final_simd(&state, &tag, req->assoclen,
cryptlen);
} else {
crypto_aegis128_init(&state, &ctx->key, req->iv);
crypto_aegis128_process_ad(&state, req->src, req->assoclen);
crypto_aegis128_process_crypt(&state, req, &walk,
crypto_aegis128_encrypt_chunk);
crypto_aegis128_final(&state, &tag, req->assoclen, cryptlen);
crypto_aegis128_final(&state, &tag, req->assoclen, cryptlen);
}
scatterwalk_map_and_copy(tag.bytes, req->dst, req->assoclen + cryptlen,
authsize, 1);
@ -426,17 +436,21 @@ static int crypto_aegis128_decrypt(struct aead_request *req)
scatterwalk_map_and_copy(tag.bytes, req->src, req->assoclen + cryptlen,
authsize, 0);
crypto_aegis128_init(&state, &ctx->key, req->iv);
crypto_aegis128_process_ad(&state, req->src, req->assoclen);
skcipher_walk_aead_decrypt(&walk, req, false);
if (aegis128_do_simd())
if (aegis128_do_simd()) {
crypto_aegis128_init_simd(&state, &ctx->key, req->iv);
crypto_aegis128_process_ad(&state, req->src, req->assoclen);
crypto_aegis128_process_crypt(&state, req, &walk,
crypto_aegis128_decrypt_chunk_simd);
else
crypto_aegis128_final_simd(&state, &tag, req->assoclen,
cryptlen);
} else {
crypto_aegis128_init(&state, &ctx->key, req->iv);
crypto_aegis128_process_ad(&state, req->src, req->assoclen);
crypto_aegis128_process_crypt(&state, req, &walk,
crypto_aegis128_decrypt_chunk);
crypto_aegis128_final(&state, &tag, req->assoclen, cryptlen);
crypto_aegis128_final(&state, &tag, req->assoclen, cryptlen);
}
return crypto_memneq(tag.bytes, zeros, authsize) ? -EBADMSG : 0;
}

50
crypto/aegis128-neon-inner.c
View File

@ -132,6 +132,36 @@ void preload_sbox(void)
:: "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);
@ -210,3 +240,23 @@ void crypto_aegis128_decrypt_chunk_neon(void *state, void *dst, const void *src,
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);
}

21
crypto/aegis128-neon.c
View File

@ -8,11 +8,14 @@
#include "aegis.h"
void crypto_aegis128_init_neon(void *state, const void *key, const void *iv);
void crypto_aegis128_update_neon(void *state, const void *msg);
void crypto_aegis128_encrypt_chunk_neon(void *state, void *dst, const void *src,
unsigned int size);
void crypto_aegis128_decrypt_chunk_neon(void *state, void *dst, const void *src,
unsigned int size);
void crypto_aegis128_final_neon(void *state, void *tag_xor, uint64_t assoclen,
uint64_t cryptlen);
int aegis128_have_aes_insn __ro_after_init;
@ -25,6 +28,15 @@ bool crypto_aegis128_have_simd(void)
return IS_ENABLED(CONFIG_ARM64);
}
void crypto_aegis128_init_simd(union aegis_block *state,
const union aegis_block *key,
const u8 *iv)
{
kernel_neon_begin();
crypto_aegis128_init_neon(state, key, iv);
kernel_neon_end();
}
void crypto_aegis128_update_simd(union aegis_block *state, const void *msg)
{
kernel_neon_begin();
@ -47,3 +59,12 @@ void crypto_aegis128_decrypt_chunk_simd(union aegis_block *state, u8 *dst,
crypto_aegis128_decrypt_chunk_neon(state, dst, src, size);
kernel_neon_end();
}
void crypto_aegis128_final_simd(union aegis_block *state,
union aegis_block *tag_xor,
u64 assoclen, u64 cryptlen)
{
kernel_neon_begin();
crypto_aegis128_final_neon(state, tag_xor, assoclen, cryptlen);
kernel_neon_end();
}