Unrelated to RSA (only used in ECP), but while improving one
mbedtls_safe_cond_xxx function, let's improve the other as well.
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
mbedtls_mpi_cf_bool_eq() is a verbatim copy of mbedtls_ssl_cf_bool_eq()
Deduplication will be part of a future task.
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
* mbedtls-2.16:
Disable OS X builds on Travis
Fix null pointer arithmetic in error case
Fix ecp_muladd test cases never getting executed
New macros TEST_EQUAL, ASSERT_ALLOC, ASSERT_ALLOC_WEAK
Remove spurious dependencies on PEM
Fix misuse of MD API in SSL constant-flow HMAC
dhm_make_common includes a piece of code that is identical to
dhm_random_below except for returning a different error code in one
case. Call dhm_random_below instead of repeating the code.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
P-1 is as bad as 1 as a blinding value. Don't accept it.
The chance that P-1 would be randomly generated is infinitesimal, so
this is not a practical issue, but it makes the code cleaner. It was
inconsistent to accept P-1 as a blinding value but not as a private key.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Unify the common parts of mbedtls_dhm_make_params and mbedtls_dhm_make_public.
No intended behavior change, except that the exact error code may
change in some corner cases which are too exotic for the existing unit
tests.
Removed usage of MBEDTLS_ERROR_ADD which does not exist in 2.16.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
mbedtls_dhm_make_params() with x_size != size of P is not likely to be
useful, but it's supported, so test it.
Cherry-picked 33ec863570e2448319ae8b44e8e4b52183450e73
Changed mbedtls_test_rnd_pseudo_info type to rnd_pseudo_info
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
Repeat a few tests that use random data. This way the code is
exercised with a few different random values.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Improve the validation of the output from mbedtls_dhm_make_params:
* Test that the output in the byte buffer matches the value in the
context structure.
* Test that the calculated values are in the desired range.
Cherry-picked dc0b6e44b0147809f4541ec2a0760eeeabdea485.
Changed mbedtls_test_rnd_pseudo_rand to rnd_pseudo_rand.
Removed test step code.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
When mbedtls_nist_kw_wrap was called with output=NULL and out_size=0, it
performed arithmetic on the null pointer before detecting that the output
buffer is too small and returning an error code. This was unlikely to have
consequences on real-world hardware today, but it is undefined behavior and
UBSan with Clang 10 flagged it. So fix it (fix#4025).
Fix a similar-looking pattern in unwrap, though I haven't verified that it's
reachable there.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Calling mbedtls_mpi_cmp_int reveals the number of leading zero limbs
to an adversary who is capable of very fine-grained timing
measurements. This is very little information, but could be practical
with secp521r1 (1/512 chance of the leading limb being 0) if the
adversary can measure the precise timing of a large number of
signature operations.
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
These test cases had been backported from Mbed TLS 2.x with a dependency
symbol that didn't exist in 2.16. Declare that symbol.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Backports some test helper macros added after 2.16. This will facilitate
backporting new test code.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
The sequence of calls starts-update-starts-update-finish is not a
guaranteed valid way to abort an operation and start a new one. Our
software implementation just happens to support it, but alt
implementations may very well not support it.
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
Fix a pointer mismatch when int32_t is not int, for example on Cortex-M where
in32_t is long int. Fix#4530
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
