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Make rng mock code also cover strongest_rand.

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This commit is contained in:
Nick Mathewson 2019-03-18 11:44:07 -04:00 committed by David Goulet
parent 0a9fb6938d
commit 7086a9f90e
1 changed files with 20 additions and 8 deletions
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28
src/test/rng_test_helpers.c
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@ -32,6 +32,13 @@
*/
static tor_mutex_t *rng_mutex = NULL;
/** replacement for crypto_strongest_rand that delegates to crypto_rand. */
static void
mock_crypto_strongest_rand(uint8_t *out, size_t len)
{
crypto_rand((char *)out, len);
}
/* This is the seed of the deterministic randomness. */
static uint8_t rng_seed[16];
static crypto_xof_t *rng_xof = NULL;
@ -79,12 +86,13 @@ enable_deterministic_rng_impl(const uint8_t *seed, size_t seed_len)
rng_xof = crypto_xof_new();
crypto_xof_add_bytes(rng_xof, rng_seed, sizeof(rng_seed));
MOCK(crypto_rand, crypto_rand_deterministic);
MOCK(crypto_strongest_rand_, mock_crypto_strongest_rand);
}
/**
* Replace our crypto_rand() prng with a variant that generates all of its
* output deterministically from a randomly chosen seed. In the event of an
* error, you can log the seed later on with
* Replace our crypto_rand() and crypto_strongest_rand() prngs with a variant
* that generates all of its output deterministically from a randomly chosen
* seed. In the event of an error, you can log the seed later on with
* testing_dump_reproducible_rng_seed.
**/
void
@ -96,9 +104,10 @@ testing_enable_reproducible_rng(void)
}
/**
* Replace our crypto_rand() prng with a variant that generates all of its
* output deterministically from a fixed seed. This variant is mainly useful
* for cases when we don't want coverage to change between runs.
* Replace our crypto_rand() and crypto_strongest_rand() prngs with a variant
* that generates all of its output deterministically from a fixed seed. This
* variant is mainly useful for cases when we don't want coverage to change
* between runs.
*
* USAGE NOTE: Test correctness SHOULD NOT depend on the specific output of
* this "rng". If you need a specific output, use
@ -139,8 +148,9 @@ crypto_rand_prefilled(char *out, size_t n)
}
/**
* Replace our crypto_rand() prng with a variant that yields output
* from a buffer. If it reaches the end of the buffer, it starts over.
* Replace our crypto_rand() and crypto_strongest_rand() prngs with a variant
* that yields output from a buffer. If it reaches the end of the buffer, it
* starts over.
**/
void
testing_enable_prefilled_rng(const void *buffer, size_t buflen)
@ -153,6 +163,7 @@ testing_enable_prefilled_rng(const void *buffer, size_t buflen)
prefilled_rng_idx = 0;
MOCK(crypto_rand, crypto_rand_prefilled);
MOCK(crypto_strongest_rand_, mock_crypto_strongest_rand);
}
/**
@ -175,5 +186,6 @@ testing_disable_rng_override(void)
crypto_xof_free(rng_xof);
tor_free(prefilled_rng_buffer);
UNMOCK(crypto_rand);
UNMOCK(crypto_strongest_rand_);
tor_mutex_free(rng_mutex);
}