[tor-commits] [tor/master] Update test_prob_distr to use new reproducible RNG override code

[dgoulet at torproject.org]

commit d3526d3f2c0e3e56dd9fa0e91b78d2787c2d8701
Author: Nick Mathewson <nickm at torproject.org>
Date:   Mon Mar 18 09:38:04 2019 -0400

    Update test_prob_distr to use new reproducible RNG override code
---
 src/test/test_prob_distr.c | 75 ++++++++++------------------------------------
 1 file changed, 15 insertions(+), 60 deletions(-)

diff --git a/src/test/test_prob_distr.c b/src/test/test_prob_distr.c
index 37cfdae7d..747c3d98e 100644
--- a/src/test/test_prob_distr.c
+++ b/src/test/test_prob_distr.c
@@ -33,6 +33,7 @@
 #include "lib/math/prob_distr.h"
 #include "lib/math/fp.h"
 #include "lib/crypt_ops/crypto_rand.h"
+#include "test/rng_test_helpers.h"
 
 #include <float.h>
 #include <math.h>
@@ -1117,49 +1118,14 @@ test_psi_dist_sample(const struct dist *dist)
   }
 }
 
-/* This is the seed of the deterministic randomness */
-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)
-{
-  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("\n"
          "NOTE: This is a stochastic test, and we expect it to fail from\n"
          "time to time, with some low probability. If you see it fail more\n"
-         "than one trial in 100, though, please tell us.\n\n"
-         "Seed: %s\n",
-         hex_str((const char*)rng_seed, sizeof(rng_seed)));
-}
-
-/** Produce deterministic randomness for the stochastic tests using the global
- *  deterministic_rand_counter seed
- *
- *  This function produces deterministic data over multiple calls iff it's
- *  called in the same call order with the same 'n' parameter (which is the
- *  case for the psi test). If not, outputs will deviate. */
-static void
-crypto_rand_deterministic(char *out, size_t n)
-{
-  /* Use a XOF to squeeze bytes out of that silly counter */
-  tor_assert(rng_xof);
-  crypto_xof_squeeze_bytes(rng_xof, (uint8_t*)out, n);
+         "than one trial in 100, though, please tell us.\n\n");
+  testing_dump_reproducible_rng_seed();
 }
 
 static void
@@ -1199,8 +1165,7 @@ test_stochastic_uniform(void *arg)
   };
   bool ok = true, tests_failed = true;
 
-  init_deterministic_rand();
-  MOCK(crypto_rand, crypto_rand_deterministic);
+  testing_enable_reproducible_rng();
 
   ok &= test_psi_dist_sample(&uniform01.base);
   ok &= test_psi_dist_sample(&uniform_pos.base);
@@ -1217,8 +1182,7 @@ test_stochastic_uniform(void *arg)
   if (tests_failed) {
     dump_seed();
   }
-  teardown_deterministic_rand();
-  UNMOCK(crypto_rand);
+  testing_disable_reproducible_rng();
 }
 
 static bool
@@ -1288,8 +1252,7 @@ test_stochastic_genpareto(void *arg)
   bool tests_failed = true;
   (void) arg;
 
-  init_deterministic_rand();
-  MOCK(crypto_rand, crypto_rand_deterministic);
+  testing_enable_reproducible_rng();
 
   ok = test_stochastic_genpareto_impl(0, 1, -0.25);
   tt_assert(ok);
@@ -1312,8 +1275,7 @@ test_stochastic_genpareto(void *arg)
   if (tests_failed) {
     dump_seed();
   }
-  teardown_deterministic_rand();
-  UNMOCK(crypto_rand);
+  testing_disable_reproducible_rng();
 }
 
 static void
@@ -1324,8 +1286,7 @@ test_stochastic_geometric(void *arg)
 
   (void) arg;
 
-  init_deterministic_rand();
-  MOCK(crypto_rand, crypto_rand_deterministic);
+  testing_enable_reproducible_rng();
 
   ok = test_stochastic_geometric_impl(0.1);
   tt_assert(ok);
@@ -1342,8 +1303,7 @@ test_stochastic_geometric(void *arg)
   if (tests_failed) {
     dump_seed();
   }
-  teardown_deterministic_rand();
-  UNMOCK(crypto_rand);
+  testing_disable_reproducible_rng();
 }
 
 static void
@@ -1353,8 +1313,7 @@ test_stochastic_logistic(void *arg)
   bool tests_failed = true;
   (void) arg;
 
-  init_deterministic_rand();
-  MOCK(crypto_rand, crypto_rand_deterministic);
+  testing_enable_reproducible_rng();
 
   ok = test_stochastic_logistic_impl(0, 1);
   tt_assert(ok);
@@ -1371,8 +1330,7 @@ test_stochastic_logistic(void *arg)
   if (tests_failed) {
     dump_seed();
   }
-  teardown_deterministic_rand();
-  UNMOCK(crypto_rand);
+  testing_disable_reproducible_rng();
 }
 
 static void
@@ -1382,8 +1340,7 @@ test_stochastic_log_logistic(void *arg)
   bool tests_failed = true;
   (void) arg;
 
-  init_deterministic_rand();
-  MOCK(crypto_rand, crypto_rand_deterministic);
+  testing_enable_reproducible_rng();
 
   ok = test_stochastic_log_logistic_impl(1, 1);
   tt_assert(ok);
@@ -1400,8 +1357,7 @@ test_stochastic_log_logistic(void *arg)
   if (tests_failed) {
     dump_seed();
   }
-  teardown_deterministic_rand();
-  UNMOCK(crypto_rand);
+  testing_disable_reproducible_rng();
 }
 
 static void
@@ -1411,8 +1367,7 @@ test_stochastic_weibull(void *arg)
   bool tests_failed = true;
   (void) arg;
 
-  init_deterministic_rand();
-  MOCK(crypto_rand, crypto_rand_deterministic);
+  testing_enable_reproducible_rng();
 
   ok = test_stochastic_weibull_impl(1, 0.5);
   tt_assert(ok);
@@ -1431,7 +1386,7 @@ test_stochastic_weibull(void *arg)
   if (tests_failed) {
     dump_seed();
   }
-  teardown_deterministic_rand();
+  testing_disable_reproducible_rng();
   UNMOCK(crypto_rand);
 }