Set the public key in a key pair. This complements mbedtls_ecp_read_key and
the functions can be used in either order.
Document the need to call check functions separately.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Sometimes you don't need to have all the parts of a key pair object. Relax
the behavior of mbedtls_ecp_keypair so that you can extract just the parts
that you need.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
Add a simple function to get the group id from a key object.
This information is available via mbedtls_ecp_export, but that function
consumes a lot of memory, which is a waste if all you need is to identify
the curve.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
In a hypothetical build with no curves, or in the future when we add a
new curve type and possibly forget updating this function with a new
block for the new type, we write to `ret` at the beginning or the
function then immediately overwrite it with MPI_CHK(check_privkey),
which static analyzers understandably find questionable.
Use `ret` here and check the key only if it was actually set.
Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
We duplicated ecp.c in the anticipation of heavy refactoring there. This
work has been suspended and the duplication is not useful anymore but
imposes an overhead.
Signed-off-by: Janos Follath <janos.follath@arm.com>
We would like to de-duplicate ecp.c, but ecp_curves.c remains duplicated
and we still want to test for the active variant.
Signed-off-by: Janos Follath <janos.follath@arm.com>
Running clang-16 on mbedtls reports warnings of type "-Wstrict-prototypes".
This patch fixes these warnings by adding void to functions with no
arguments. The generate_test_code.py is modified to insert void into test
functions with no arguments in *.function files.
Signed-off-by: Gowtham Suresh Kumar <gowtham.sureshkumar@arm.com>
This patch updates the method to not free the `grp->P`
and `grp->N` structure members.
The contents of `P` and `N` are stored in static memory at
`curve448_p/n` and `curve25519p/n` and no longer dynamically
allocated.
Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
We used to include platform.h only when MBEDTLS_PLATFORM_C was enabled, and
to define ad hoc replacements for mbedtls_xxx functions on a case-by-case
basis when MBEDTLS_PLATFORM_C was disabled. The only reason for this
complication was to allow building individual source modules without copying
platform.h. This is not something we support or recommend anymore, so get
rid of the complication: include platform.h unconditionally.
There should be no change in behavior since just including the header should
not change the behavior of a program.
This commit replaces most occurrences of conditional inclusion of
platform.h, using the following code:
```
perl -i -0777 -pe 's!#if.*\n#include "mbedtls/platform.h"\n(#else.*\n(#define (mbedtls|MBEDTLS)_.*\n|#include <(stdarg|stddef|stdio|stdlib|string|time)\.h>\n)*)?#endif.*!#include "mbedtls/platform.h"!mg' $(git grep -l '#include "mbedtls/platform.h"')
```
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
The bit length of m is leaked through through timing in ecp_mul_mxz().
Initially found by Manuel Pégourié-Gonnard on ecp_mul_edxyz(), which has
been inspired from ecp_mul_mxz(), during initial review of the EdDSA PR.
See: https://github.com/Mbed-TLS/mbedtls/pull/3245#discussion_r490827996
Fix that by using grp->nbits + 1 instead, which anyway is very close to
the length of m, which means there is no significant performance impact.
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
