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Extra tests for tor_memeq and memcmp

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(Patch from teor; part of 13104)
This commit is contained in:
Nick Mathewson 2014-09-10 23:58:02 -04:00
parent d2463c0cfe
commit 5126bc2ebd
1 changed files with 19 additions and 0 deletions
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19
src/test/test_util.c
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@ -3251,6 +3251,25 @@ test_util_di_ops(void)
test_eq(neq1, !eq1);
}
/* exhaustively white-box test tor_memeq
* against each possible (single-byte) bit difference
* some arithmetic bugs only appear with certain bit patterns */
const uint8_t z = 0;
uint8_t ii = 0;
for (i = 0; i < 256; i++) {
ii = (uint8_t)i;
test_eq(tor_memeq(&z, &ii, 1), z == ii);
}
/* exhaustively white-box test tor_memcmp
* against each possible single-byte numeric difference
* some arithmetic bugs only appear with certain bit patterns */
for (i = 0; i < 256; i++) {
ii = (uint8_t)i;
test_eq(tor_memcmp(&z, &ii, 1) > 0 ? GT : EQ, z > ii ? GT : EQ);
test_eq(tor_memcmp(&ii, &z, 1) < 0 ? LT : EQ, ii < z ? LT : EQ);
}
tt_int_op(1, ==, safe_mem_is_zero("", 0));
tt_int_op(1, ==, safe_mem_is_zero("", 1));
tt_int_op(0, ==, safe_mem_is_zero("a", 1));