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White-box tests for crypto_rand_*_range(), rand_hostname().

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Coverage-driven; part of ticket 16794.
This commit is contained in:
Nick Mathewson 2016-04-13 08:17:56 -04:00
parent 8340becd39
commit d1f2af57df
1 changed files with 38 additions and 2 deletions
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40
src/test/test_crypto.c
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@ -73,6 +73,7 @@ test_crypto_rng(void *arg)
int i, j, allok;
char data1[100], data2[100];
double d;
char *h=NULL;
/* Try out RNG. */
(void)arg;
@ -104,9 +105,16 @@ test_crypto_rng(void *arg)
allok = 0;
tor_free(host);
}
/* Make sure crypto_random_hostname clips its inputs properly. */
h = crypto_random_hostname(20000, 9000, "www.", ".onion");
tt_assert(! strcmpstart(h,"www."));
tt_assert(! strcmpend(h,".onion"));
tt_int_op(63+4+6, OP_EQ, strlen(h));
tt_assert(allok);
done:
;
tor_free(h);
}
static void
@ -125,10 +133,38 @@ test_crypto_rng_range(void *arg)
if (x == 8)
got_largest = 1;
}
/* These fail with probability 1/10^603. */
tt_assert(got_smallest);
tt_assert(got_largest);
got_smallest = got_largest = 0;
const uint64_t ten_billion = 10 * ((uint64_t)1000000000000);
for (i = 0; i < 1000; ++i) {
uint64_t x = crypto_rand_uint64_range(ten_billion, ten_billion+10);
tt_u64_op(x, OP_GE, ten_billion);
tt_u64_op(x, OP_LT, ten_billion+10);
if (x == ten_billion)
got_smallest = 1;
if (x == ten_billion+9)
got_largest = 1;
}
tt_assert(got_smallest);
tt_assert(got_largest);
const time_t now = time(NULL);
for (i = 0; i < 2000; ++i) {
time_t x = crypto_rand_time_range(now, now+60);
tt_i64_op(x, OP_GE, now);
tt_i64_op(x, OP_LT, now+60);
if (x == now)
got_smallest = 1;
if (x == now+59)
got_largest = 1;
}
tt_assert(got_smallest);
tt_assert(got_largest);
done:
;
}