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Add a unit test for secure rng.

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Mostly, this is just to make sure our arc4random_buf() implementation isn't
dumb.
This commit is contained in:
Nick Mathewson 2010-02-18 01:43:37 -05:00
parent ff2a134d6e
commit 48a29b6816
1 changed files with 53 additions and 0 deletions
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53
test/regress_util.c
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@ -46,6 +46,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "event2/event.h"
#include "event2/util.h"
@ -711,6 +712,57 @@ end:
return -1;
}
static void
test_evutil_rand(void *arg)
{
char buf1[32];
char buf2[32];
int counts[256];
int i, j, k, n=0;
memset(buf2, 0, sizeof(buf2));
memset(counts, 0, sizeof(counts));
for (k=0;k<32;++k) {
/* Try a few different start and end points; try to catch
* the various misaligned cases of arc4random_buf */
int startpoint = _evutil_weakrand() % 4;
int endpoint = 32 - (_evutil_weakrand() % 4);
memset(buf2, 0, sizeof(buf2));
/* Do 6 runs over buf1, or-ing the result into buf2 each
* time, to make sure we're setting each byte that we mean
* to set. */
for (i=0;i<8;++i) {
memset(buf1, 0, sizeof(buf1));
evutil_secure_rng_get_bytes(buf1 + startpoint,
endpoint-startpoint);
n += endpoint - startpoint;
for (j=0; j<32; ++j) {
if (j >= startpoint && j < endpoint) {
buf2[j] |= buf1[j];
++counts[(unsigned char)buf1[j]];
} else {
assert(buf1[j] == 0);
tt_int_op(buf1[j], ==, 0);
}
}
}
/* This will give a false positive with P=(256**8)==(2**64)
* for each character. */
for (j=startpoint;j<endpoint;++j) {
tt_int_op(buf2[j], !=, 0);
}
}
/* for (i=0;i<256;++i) { printf("%3d %2d\n", i, counts[i]); } */
end:
;
}
static void
test_evutil_getaddrinfo(void *arg)
{
@ -907,6 +959,7 @@ struct testcase_t util_testcases[] = {
{ "log", test_evutil_log, TT_FORK, NULL, NULL },
{ "upcast", test_evutil_upcast, 0, NULL, NULL },
{ "integers", test_evutil_integers, 0, NULL, NULL },
{ "rand", test_evutil_rand, TT_FORK, NULL, NULL },
{ "getaddrinfo", test_evutil_getaddrinfo, TT_FORK, NULL, NULL },
END_OF_TESTCASES,
};