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hwcrypto: SHA acceleration using safe DPORT reads

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This commit is contained in:
Angus Gratton 2017-08-16 12:15:37 +10:00 committed by Angus Gratton
parent 7be002ec0f
commit d0c300c52d
1 changed files with 56 additions and 30 deletions
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86
components/esp32/hwcrypto/sha.c
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@ -159,13 +159,17 @@ static void esp_sha_lock_engine_inner(sha_engine_state *engine)
_lock_acquire(&state_change_lock);
if (sha_engines_all_idle()) {
/* Enable SHA hardware */
DPORT_REG_SET_BIT(DPORT_PERI_CLK_EN_REG, DPORT_PERI_EN_SHA);
/* also clear reset on secure boot, otherwise SHA is held in reset */
DPORT_REG_CLR_BIT(DPORT_PERI_RST_EN_REG,
DPORT_PERI_EN_SHA
| DPORT_PERI_EN_SECUREBOOT);
ets_sha_enable();
DPORT_STALL_OTHER_CPU_START();
{
/* Enable SHA hardware */
_DPORT_REG_SET_BIT(DPORT_PERI_CLK_EN_REG, DPORT_PERI_EN_SHA);
/* also clear reset on secure boot, otherwise SHA is held in reset */
_DPORT_REG_CLR_BIT(DPORT_PERI_RST_EN_REG,
DPORT_PERI_EN_SHA
| DPORT_PERI_EN_SECUREBOOT);
ets_sha_enable();
}
DPORT_STALL_OTHER_CPU_END();
}
_lock_release(&state_change_lock);
@ -187,8 +191,12 @@ void esp_sha_unlock_engine(esp_sha_type sha_type)
if (sha_engines_all_idle()) {
/* Disable SHA hardware */
/* Don't assert reset on secure boot, otherwise AES is held in reset */
DPORT_REG_SET_BIT(DPORT_PERI_RST_EN_REG, DPORT_PERI_EN_SHA);
DPORT_REG_CLR_BIT(DPORT_PERI_CLK_EN_REG, DPORT_PERI_EN_SHA);
DPORT_STALL_OTHER_CPU_START();
{
_DPORT_REG_SET_BIT(DPORT_PERI_RST_EN_REG, DPORT_PERI_EN_SHA);
_DPORT_REG_CLR_BIT(DPORT_PERI_CLK_EN_REG, DPORT_PERI_EN_SHA);
}
DPORT_STALL_OTHER_CPU_END();
}
_lock_release(&state_change_lock);
@ -198,10 +206,16 @@ void esp_sha_unlock_engine(esp_sha_type sha_type)
void esp_sha_wait_idle(void)
{
while(REG_READ(SHA_1_BUSY_REG) == 1) {}
while(REG_READ(SHA_256_BUSY_REG) == 1) {}
while(REG_READ(SHA_384_BUSY_REG) == 1) {}
while(REG_READ(SHA_512_BUSY_REG) == 1) {}
DPORT_STALL_OTHER_CPU_START();
while(1) {
if(_DPORT_REG_READ(SHA_1_BUSY_REG) == 0
&& _DPORT_REG_READ(SHA_256_BUSY_REG) == 0
&& _DPORT_REG_READ(SHA_384_BUSY_REG) == 0
&& _DPORT_REG_READ(SHA_512_BUSY_REG) == 0) {
break;
}
}
DPORT_STALL_OTHER_CPU_END();
}
void esp_sha_read_digest_state(esp_sha_type sha_type, void *digest_state)
@ -211,23 +225,26 @@ void esp_sha_read_digest_state(esp_sha_type sha_type, void *digest_state)
esp_sha_lock_memory_block();
esp_sha_wait_idle();
DPORT_STALL_OTHER_CPU_START(); // This block reads from DPORT memory (reg_addr_buf)
{
esp_sha_wait_idle();
REG_WRITE(SHA_LOAD_REG(sha_type), 1);
while(REG_READ(SHA_BUSY_REG(sha_type)) == 1) { }
_DPORT_REG_WRITE(SHA_LOAD_REG(sha_type), 1);
while(_DPORT_REG_READ(SHA_BUSY_REG(sha_type)) == 1) { }
uint32_t *digest_state_words = (uint32_t *)digest_state;
uint32_t *reg_addr_buf = (uint32_t *)(SHA_TEXT_BASE);
if(sha_type == SHA2_384 || sha_type == SHA2_512) {
/* for these ciphers using 64-bit states, swap each pair of words */
for(int i = 0; i < sha_length(sha_type)/4; i += 2) {
digest_state_words[i+1] = reg_addr_buf[i];
digest_state_words[i]= reg_addr_buf[i+1];
uint32_t *digest_state_words = (uint32_t *)digest_state;
uint32_t *reg_addr_buf = (uint32_t *)(SHA_TEXT_BASE);
if(sha_type == SHA2_384 || sha_type == SHA2_512) {
/* for these ciphers using 64-bit states, swap each pair of words */
for(int i = 0; i < sha_length(sha_type)/4; i += 2) {
digest_state_words[i+1] = reg_addr_buf[i];
digest_state_words[i]= reg_addr_buf[i+1];
}
} else {
memcpy(digest_state_words, reg_addr_buf, sha_length(sha_type));
}
} else {
memcpy(digest_state_words, reg_addr_buf, sha_length(sha_type));
}
asm volatile ("memw");
DPORT_STALL_OTHER_CPU_END();
esp_sha_unlock_memory_block();
}
@ -250,9 +267,9 @@ void esp_sha_block(esp_sha_type sha_type, const void *data_block, bool is_first_
asm volatile ("memw");
if(is_first_block) {
REG_WRITE(SHA_START_REG(sha_type), 1);
DPORT_REG_WRITE(SHA_START_REG(sha_type), 1);
} else {
REG_WRITE(SHA_CONTINUE_REG(sha_type), 1);
DPORT_REG_WRITE(SHA_CONTINUE_REG(sha_type), 1);
}
esp_sha_unlock_memory_block();
@ -275,14 +292,23 @@ void esp_sha(esp_sha_type sha_type, const unsigned char *input, size_t ilen, uns
size_t chunk_len = (ilen > block_len) ? block_len : ilen;
esp_sha_lock_memory_block();
esp_sha_wait_idle();
ets_sha_update(&ctx, sha_type, input, chunk_len * 8);
DPORT_STALL_OTHER_CPU_START();
{
// This SHA ROM function reads DPORT regs
ets_sha_update(&ctx, sha_type, input, chunk_len * 8);
}
DPORT_STALL_OTHER_CPU_END();
esp_sha_unlock_memory_block();
input += chunk_len;
ilen -= chunk_len;
}
esp_sha_lock_memory_block();
esp_sha_wait_idle();
ets_sha_finish(&ctx, sha_type, output);
DPORT_STALL_OTHER_CPU_START();
{
ets_sha_finish(&ctx, sha_type, output);
}
DPORT_STALL_OTHER_CPU_END();
esp_sha_unlock_memory_block();
esp_sha_unlock_engine(sha_type);