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Don't exercise if the algorithm is not supported

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Parsing a key and importing it into PSA may result in a policy that
specifies an algorithm that is not included in the build. This happens if
the key type is supported, but not the algorithm, e.g. in a build with
MBEDTLS_ECP_C but not MBEDTLS_ECDSA_C.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2024-02-12 14:19:24 +01:00
parent 1d33876d37
commit 34955677e5
3 changed files with 67 additions and 2 deletions
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16
tests/include/test/psa_exercise_key.h
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@ -221,4 +221,20 @@ int mbedtls_test_psa_exercise_key(mbedtls_svc_key_id_t key,
psa_key_usage_t mbedtls_test_psa_usage_to_exercise(psa_key_type_t type,
psa_algorithm_t alg);
/** Whether the specified algorithm can be exercised.
*
* \note This function is solely based on the algorithm and does not
* consider potential issues with the compatibility of a key.
* The idea is that you already have a key, so you know that the
* key type is supported, and you want to exercise the key but
* only if the algorithm given in its policy is enabled in the
* compile-time configuration.
*
* \note This function currently only supports signature algorithms
* (including wildcards).
* TODO: a more general mechanism, which should be automatically
* generated and possibly available as a library function?
*/
int mbedtls_test_can_exercise_psa_algorithm(psa_algorithm_t alg);
#endif /* PSA_EXERCISE_KEY_H */