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fill CSPRNG caches lazily to speed up early init

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This commit is contained in:
Daniel Micay 2019-04-15 07:11:39 -04:00
parent a13db3fc68
commit 13ee04c8c3
1 changed files with 6 additions and 9 deletions
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13
random.c
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@ -39,8 +39,7 @@ void random_state_init(struct random_state *state) {
get_random_seed(rnd, sizeof(rnd)); get_random_seed(rnd, sizeof(rnd));
chacha_keysetup(&state->ctx, rnd); chacha_keysetup(&state->ctx, rnd);
chacha_ivsetup(&state->ctx, rnd + CHACHA_KEY_SIZE); chacha_ivsetup(&state->ctx, rnd + CHACHA_KEY_SIZE);
chacha_keystream_bytes(&state->ctx, state->cache, RANDOM_CACHE_SIZE); state->index = RANDOM_CACHE_SIZE;
state->index = 0;
state->reseed = 0; state->reseed = 0;
} }
@ -49,19 +48,17 @@ void random_state_init_from_random_state(struct random_state *state, struct rand
get_random_bytes(source, rnd, sizeof(rnd)); get_random_bytes(source, rnd, sizeof(rnd));
chacha_keysetup(&state->ctx, rnd); chacha_keysetup(&state->ctx, rnd);
chacha_ivsetup(&state->ctx, rnd + CHACHA_KEY_SIZE); chacha_ivsetup(&state->ctx, rnd + CHACHA_KEY_SIZE);
chacha_keystream_bytes(&state->ctx, state->cache, RANDOM_CACHE_SIZE); state->index = RANDOM_CACHE_SIZE;
state->index = 0;
state->reseed = 0; state->reseed = 0;
} }
static void refill(struct random_state *state) { static void refill(struct random_state *state) {
if (state->reseed < RANDOM_RESEED_SIZE) { if (state->reseed >= RANDOM_RESEED_SIZE) {
random_state_init(state);
}
chacha_keystream_bytes(&state->ctx, state->cache, RANDOM_CACHE_SIZE); chacha_keystream_bytes(&state->ctx, state->cache, RANDOM_CACHE_SIZE);
state->index = 0; state->index = 0;
state->reseed += RANDOM_CACHE_SIZE; state->reseed += RANDOM_CACHE_SIZE;
} else {
random_state_init(state);
}
} }
void get_random_bytes(struct random_state *state, void *buf, size_t size) { void get_random_bytes(struct random_state *state, void *buf, size_t size) {