Commit graph

17 commits

Author SHA1 Message Date
Steven Cooreman
3409b02b27 Remove superfluous check
As psa_mac_sign_finish / psa_mac_verify_finish already checks that the
operation structure is valid (id is non-zero), the driver itself doesn't
have to check for that anymore. If the operation has a driver ID assigned,
it means that driver has returned success from its setup function, so the
algorithm value will be set correctly.

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
2021-05-07 23:33:50 +02:00
Steven Cooreman
8f37004bd7 Remove unused variable from MAC driver structure
Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
2021-05-07 23:33:50 +02:00
Steven Cooreman
dcd0811501 Remove superfluous length check
The key passed to the driver has been imported by the PSA Core, meaning
its length has already been verified, and the driver can rely on the
buffer length and key attributes being consistent.

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
2021-05-07 23:33:50 +02:00
Steven Cooreman
094a77e79c Code flow and style improvements
Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
2021-05-07 23:33:50 +02:00
Steven Cooreman
a6df6040ee Base the PSA implementation of TLS 1.2 PRF on the MAC API
This means there is no longer a need to have an internal HMAC API, so
it is being removed in this commit as well.

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
2021-05-07 23:33:50 +02:00
Steven Cooreman
dd1a915c0f Rename HMAC operation structure
Prefix with 'mbedtls_psa' as per the other types which implement some
sort of algorithm in software.

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
2021-05-07 23:33:50 +02:00
Steven Cooreman
36876a01a4 Make safer_memcmp available to all compile units under PSA
Now renamed to mbedtls_psa_safer_memcmp, it provides a single location
for buffer comparison.

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
2021-05-07 23:33:50 +02:00
Steven Cooreman
a4638e708e Remove redundant key_set from MAC operation structure
The purpose of key_set was to guard the operation structure from being
used for update/finish before a key was set. Now that the implementation
fully adheres to the PSA API, that function is covered by the `alg`
variable instead. It's set to the algorithm in use when a key is set, and
is zero when the operation is reset/invalid.

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
2021-05-07 23:33:50 +02:00
Steven Cooreman
ba9a5bf5e7 Code flow/readability improvements after review
* Early return since there's nothing to clean up
* Get rid of unnecessary local variable
* Check algorithm validity for MAC in the PSA core instead of in the driver

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
2021-05-07 23:33:50 +02:00
Steven Cooreman
02fc62a6fa Remove unused items from MAC operation context structure
Apparently it was at some point assumed that there would be
support for MAC algorithms with IV, but that hasn't been
implemented yet. Until that time, these context structure
members are superfluous and can be removed.

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
2021-05-07 23:33:50 +02:00
Steven Cooreman
d1955af5df Rename internal HMAC structure type to match convention
Typedef'ed structures are suffixed _t
Also updated the initialiser macro with content that actually
matches the structure's content.

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
2021-05-07 23:32:32 +02:00
Steven Cooreman
4fdf060a81 Complete, document and fully use internal HMAC API
Since HMAC moved into its own compilation unit, the internal API needed
to be documented and finalized. This means no more reaching deep into
the operation structure from within the PSA Crypto core. This will make
future refactoring work easier, since internal HMAC is now opaque to the
core.

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
2021-05-07 23:32:32 +02:00
Steven Cooreman
a5b860a5f8 Migrate MAC finish calls into the software driver
Step 3/x in moving the driver. Separate commits should make for easier
review.

Additional changes on top of code movement:
* Copied the implementation of safer_memcmp from psa_crypto into
  psa_cipher_mac since the mac_verify driver implementation
  depends on it, and it isn't available through external linkage

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
2021-05-07 23:32:32 +02:00
Steven Cooreman
6e7f291bb5 Migrate MAC update call into the software driver
Step 2/x in moving the driver. Separate commits should make for easier
review.

Additional changes on top of code movement:
* Early-return success on input with zero-length to mac_update, to
  avoid NULL pointers getting passed into the driver dispatch

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
2021-05-07 23:32:32 +02:00
Steven Cooreman
e680419791 Migrate MAC setup/abort calls into the software driver
Step 1/x in moving the driver. Separate commits should make for easier
review.
Additional changes on top of just moving code:
* Added a sanity check on the key buffer size for CMAC.
* Transfered responsibility for resetting the core members of the
  PSA MAC operation structure back to the core (from the driver
  wrapper layer)

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
2021-05-07 23:32:32 +02:00
Steven Cooreman
82c66b6b8b Move internal HMAC implementation into internal MAC driver
This is a temporary measure. Other operations in the PSA Core which rely
on this internal HMAC API should be rewritten to use the MAC API instead,
since they can then leverage accelerated HMAC should a platform provide
such acceleration support.

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
2021-05-07 23:32:32 +02:00
Steven Cooreman
d13a70f2dc Add boilerplate for dispatching MAC operations
Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
2021-05-07 23:32:32 +02:00