Constant-time testing with Memsan or Valgrind is much more robust, as it
doesn't require cooperation from the code under test.
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
The rest of the file uses mbedtls_mpi_uint_t unconditionally, so its
definition should also be #include'd unconditionally.
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
Without this, it's not at all obvious that turning on MBEDTLS_TEST_HOOKS
doesn't change the functional behavior of the code.
Signed-off-by: Janos Follath <janos.follath@arm.com>
Unfortunately compilers aren't good at analyzing whether variables are
analyzed on all code paths, and it is better to initialize to the
safe-path values.
Signed-off-by: Janos Follath <janos.follath@arm.com>
A + B + 1 is not a good way to get a number that's neither A nor B.
This can be a problem for example if values later are changed to
A = 0 and B = -1.
Signed-off-by: Janos Follath <janos.follath@arm.com>
Only add the test hooks where it is meaningful. That is, not adding
where the operation is essentially the same or the target is not the
function that is being tested.
Signed-off-by: Janos Follath <janos.follath@arm.com>
Not adding _unsafe version to the tests targeting behaviour related to
RR as it is independent from the secret involved in the safe/unsafe
distinction.
Signed-off-by: Janos Follath <janos.follath@arm.com>
The new test hooks allow to check whether there was an unsafe call of an
optionally safe function in the codepath. For the sake of simplicity the
MBEDTLS_MPI_IS_* macros are reused for signalling safe/unsafe codepaths
here too.
Signed-off-by: Janos Follath <janos.follath@arm.com>
The allocated size can be significantly larger than the actual size. In
the unsafe case we can use the actual size and gain some performance.
Signed-off-by: Janos Follath <janos.follath@arm.com>
It is easier to read if the parameter controlling constant timeness with
respect to a parameter is next to that parameter.
Signed-off-by: Janos Follath <janos.follath@arm.com>
In Thumb instructions, constant can be:
- any constant that can be produced by shifting an 8-bit value left by any
number of bits within a 32-bit word
- any constant of the form 0x00XY00XY
- any constant of the form 0xXY00XY00
- any constant of the form 0xXYXYXYXY.
Signed-off-by: Janos Follath <janos.follath@arm.com>
These macros are not part of any public or internal API, ideally they
would be defined in the source files. The reason to put them in
bignum_core.h to avoid duplication as macros for this purpose are
needed in both bignum.c and bignum_core.c.
Signed-off-by: Janos Follath <janos.follath@arm.com>
The complexity of having functions whose security properties depend on a
runtime argument can be dangerous. Limit risk by isolating such code in
small functions with limited scope.
Signed-off-by: Janos Follath <janos.follath@arm.com>
The complexity of having functions whose security properties depend on a
runtime argument can be dangerous. Limit misuse by making any such
functions local.
Signed-off-by: Janos Follath <janos.follath@arm.com>
Attempt to partially solve the performance regression in 3.6.0 without
adding too much code size.
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
* restricted/development-restricted: (30 commits)
Tiny fix in ChangeLog pt 2
Tiny fix in ChangeLog
Changelog entry for the RSA memory leak
Edit ChangeLog entry
Update ChangeLog
Add test cases for extKeyUsage
Rationalize extKeyUsage tests
Use P_CLI when O_CLI's status is not reliable
Rationalize keyUsage testing, round 2
Always print detailed cert errors in test programs
Fix 1.3 failure to update flags for (ext)KeyUsage
Rationalize ssl-opt tests for keyUsage
Test cert alert KEY_USAGE -> UNSUPPORTED_CERT
Free allocated memory where methods were returning without freeing
Force MBEDTLS_PSA_HMAC_DRBG_MD_TYPE based on CTR_DRBG
Document that MBEDTLS_PSA_HMAC_DRBG_MD_TYPE does not force HMAC
Clean up constant-flow memsan testing
Improve description of who is affected
More diversified sizes in tests
Fix stack buffer overflow in ECDSA signature format conversions
...
