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Speed up the deterministic prng in test_prob_distr, by a lot.

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Using a single xof object and squeezing it repeatedly should make
everything MUCH faster here.
This commit is contained in:
Nick Mathewson
2019-01-17 16:10:02 -05:00
parent 77712a5fa2
commit c08fc2e19e
1 changed files with 31 additions and 16 deletions
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src/test/test_prob_distr.c
+31 -16
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@@ -1115,13 +1115,30 @@ test_psi_dist_sample(const struct dist *dist)
}
/* This is the seed of the deterministic randomness */
static uint32_t deterministic_rand_counter;
static uint8_t rng_seed[16];
static crypto_xof_t *rng_xof = NULL;
/** Initialize the seed of the deterministic randomness. */
static void
init_deterministic_rand(void)
{
deterministic_rand_counter = crypto_rand_u32();
crypto_rand((char*)rng_seed, sizeof(rng_seed));
crypto_xof_free(rng_xof);
rng_xof = crypto_xof_new();
crypto_xof_add_bytes(rng_xof, rng_seed, sizeof(rng_seed));
}
static void
teardown_deterministic_rand(void)
{
crypto_xof_free(rng_xof);
}
static void
dump_seed(void)
{
printf("\nSeed: %s\n",
hex_str((const char*)rng_seed, sizeof(rng_seed)));
}
/** Produce deterministic randomness for the stochastic tests using the global
@@ -1134,15 +1151,8 @@ static void
crypto_rand_deterministic(char *out, size_t n)
{
/* Use a XOF to squeeze bytes out of that silly counter */
crypto_xof_t *xof = crypto_xof_new();
tor_assert(xof);
crypto_xof_add_bytes(xof, (uint8_t*)&deterministic_rand_counter,
sizeof(deterministic_rand_counter));
crypto_xof_squeeze_bytes(xof, (uint8_t*)out, n);
crypto_xof_free(xof);
/* Increase counter for next run */
deterministic_rand_counter++;
tor_assert(rng_xof);
crypto_xof_squeeze_bytes(rng_xof, (uint8_t*)out, n);
}
static void
@@ -1287,8 +1297,9 @@ test_stochastic_genpareto(void *arg)
done:
if (tests_failed) {
printf("seed: %"PRIu32, deterministic_rand_counter);
dump_seed();
}
teardown_deterministic_rand();
UNMOCK(crypto_rand);
}
@@ -1316,8 +1327,9 @@ test_stochastic_geometric(void *arg)
done:
if (tests_failed) {
printf("seed: %"PRIu32, deterministic_rand_counter);
dump_seed();
}
teardown_deterministic_rand();
UNMOCK(crypto_rand);
}
@@ -1344,8 +1356,9 @@ test_stochastic_logistic(void *arg)
done:
if (tests_failed) {
printf("seed: %"PRIu32, deterministic_rand_counter);
dump_seed();
}
teardown_deterministic_rand();
UNMOCK(crypto_rand);
}
@@ -1372,8 +1385,9 @@ test_stochastic_log_logistic(void *arg)
done:
if (tests_failed) {
printf("seed: %"PRIu32, deterministic_rand_counter);
dump_seed();
}
teardown_deterministic_rand();
UNMOCK(crypto_rand);
}
@@ -1402,8 +1416,9 @@ test_stochastic_weibull(void *arg)
done:
if (tests_failed) {
printf("seed: %"PRIu32, deterministic_rand_counter);
dump_seed();
}
teardown_deterministic_rand();
UNMOCK(crypto_rand);
}