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chunk: Add predictable hash function

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Since chunk_hash() is randomized its output is not predictable, that is,
it is only within the same process.
This commit is contained in:
Tobias Brunner
2013-06-28 17:00:29 +02:00
parent b7b5432ff8
commit ed235dbbf2
3 changed files with 86 additions and 2 deletions
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src/libstrongswan/tests/test_chunk.c
+33 -1
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@@ -698,7 +698,6 @@ START_TEST(test_chunk_mac)
}
END_TEST
/*******************************************************************************
* test for chunk_hash[_inc]()
*/
@@ -721,6 +720,35 @@ START_TEST(test_chunk_hash)
}
END_TEST
/*******************************************************************************
* test for chunk_hash_static[_inc]()
*/
START_TEST(test_chunk_hash_static)
{
chunk_t in;
u_int32_t out, hash_a, hash_b, hash_inc = 0x7b891a95;
int i, count;
count = countof(sip_vectors);
in = chunk_alloca(count);
for (i = 0; i < count; ++i)
{
in.ptr[i] = i;
in.len = i;
/* compared to chunk_mac() we only get half the value back */
out = chunk_hash_static(in);
fail_unless(memeq(&out, sip_vectors[i], 4),
"test vector failed for %d bytes", i);
}
hash_a = chunk_hash_static_inc(in, out);
ck_assert_int_eq(hash_a, hash_inc);
hash_b = chunk_hash_static_inc(in, out);
ck_assert_int_eq(hash_a, hash_b);
}
END_TEST
/*******************************************************************************
* printf_hook tests
*/
@@ -822,6 +850,10 @@ Suite *chunk_suite_create()
tcase_add_test(tc, test_chunk_hash);
suite_add_tcase(s, tc);
tc = tcase_create("chunk_hash_static");
tcase_add_test(tc, test_chunk_hash_static);
suite_add_tcase(s, tc);
tc = tcase_create("printf_hook");
tcase_add_loop_test(tc, test_printf_hook_hash, 0, countof(printf_hook_data));
tcase_add_loop_test(tc, test_printf_hook, 0, countof(printf_hook_data));