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Prevent mbedtls_psa_register_se_key with volatile keys

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mbedtls_psa_register_se_key() is not usable with volatile keys, since there
is no way to return the implementation-chosen key identifier which would be
needed to use the key. Document this limitation. Reject an attempt to create
such an unusable key. Fixes #9253.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2024-06-13 16:06:45 +02:00
parent 86c603702e
commit d72ad738bd
5 changed files with 32 additions and 1 deletions
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3
include/psa/crypto.h
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@ -129,6 +129,9 @@ static psa_key_attributes_t psa_key_attributes_init(void);
*
* \param[out] attributes The attribute structure to write to.
* \param key The persistent identifier for the key.
* This can be any value in the range from
* #PSA_KEY_ID_USER_MIN to #PSA_KEY_ID_USER_MAX
* inclusive.
*/
static void psa_set_key_id(psa_key_attributes_t *attributes,
mbedtls_svc_key_id_t key);

8
include/psa/crypto_extra.h
View File

@ -154,6 +154,14 @@ static inline void psa_clear_key_slot_number(
* specified in \p attributes.
*
* \param[in] attributes The attributes of the existing key.
* - The lifetime must be a persistent lifetime
* in a secure element. Volatile lifetimes are
* not currently supported.
* - The key identifier must be in the valid
* range for persistent keys.
* - The key type and size must be specified and
* must be consistent with the key material
* in the secure element.
*
* \retval #PSA_SUCCESS
* The key was successfully registered.