yuzu-emu/mbedtls
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Add single-bit difference tests

Browse source 
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-09-11 19:05:30 +01:00
parent 31d49cd57f
commit 140d5c77d0
2 changed files with 44 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
tests/suites/test_suite_constant_time.data
View file

@ -91,6 +91,9 @@ mbedtls_ct_memcmp:-1:17:2
mbedtls_ct_memcmp len 17 offset 3
mbedtls_ct_memcmp:-1:17:3
mbedtls_ct_memcmp_single_bit_diff
mbedtls_ct_memcmp_single_bit_diff:
mbedtls_ct_memcpy_if len 1 offset 0
mbedtls_ct_memcpy_if:1:1:0

41
tests/suites/test_suite_constant_time.function
View file

@ -172,6 +172,47 @@ exit:
}
/* END_CASE */
/* BEGIN_CASE */
void mbedtls_ct_memcmp_single_bit_diff()
{
uint8_t *a = NULL, *b = NULL;
size_t size = 32;
TEST_CALLOC(a, size);
TEST_CALLOC(b, size);
TEST_CF_SECRET(a, size);
TEST_CF_SECRET(b, size);
int result = mbedtls_ct_memcmp(a, b, size);
TEST_CF_PUBLIC(a, size);
TEST_CF_PUBLIC(b, size);
TEST_EQUAL(result, 0);
for (size_t offset = 0; offset < size; offset++) {
for (size_t bit_offset = 0; bit_offset < 8; bit_offset++) {
/* Set a single bit to be different at given offset, to test that we
detect single-bit differences */
a[offset] = 1 << bit_offset;
TEST_CF_SECRET(a, size);
TEST_CF_SECRET(b, size);
result = mbedtls_ct_memcmp(a, b, size);
TEST_CF_PUBLIC(a, size);
TEST_CF_PUBLIC(b, size);
TEST_ASSERT(result != 0);
a[offset] = 0;
}
}
exit:
mbedtls_free(a);
mbedtls_free(b);
}
/* END_CASE */
/* BEGIN_CASE */
void mbedtls_ct_memcmp(int same, int size, int offset)
{