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Let get_builtin_key be called to retrieve the key's attributes

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Allow the core to call the "get_builtin_key" entry point to retrieve
the attributes of a built-in key. This is useful to implement
psa_get_key_attributes(), and also when the key data buffer's size
depends on the key type and size.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2020-12-07 18:41:50 +01:00
parent a6454d2820
commit 1fc4c8d11b
1 changed files with 2 additions and 2 deletions
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4
docs/proposed/psa-driver-interface.md
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@ -659,7 +659,7 @@ psa_status_t acme_get_builtin_key(psa_drv_slot_number_t slot_number,
size_t key_buffer_size);
```
If this function returns `PSA_SUCCESS`, it must fill `attributes` with the attributes of the key (except for the key identifier) and must fill `key_buffer` with the key context.
If this function returns `PSA_SUCCESS` or `PSA_ERROR_BUFFER_TOO_SMALL`, it must fill `attributes` with the attributes of the key (except for the key identifier). On success, this function must also fill `key_buffer` with the key context.
On entry, `psa_get_key_lifetime(attributes)` is the location at which the driver was declared and the persistence level `#PSA_KEY_LIFETIME_PERSISTENT`. The driver entry point may change the lifetime to one with the same location but a different persistence level. The standard attributes other than the key identifier and lifetime have the value conveyed by `PSA_KEY_ATTRIBUTES_INIT`.
@ -670,8 +670,8 @@ Typically, for a built-in key, the key context is a reference to key material th
This entry point may return the following status values:
* `PSA_SUCCESS`: the requested key exists, and the output parameters `attributes` and `key_buffer` contain the key metadata and key data respectively.
* `PSA_ERROR_BUFFER_TOO_SMALL`: `key_buffer_size` is insufficient. In this case, the driver must pass the key's attributes in `*attributes`. In particular, `get_builtin_key(slot_number, &attributes, NULL, 0)` is a way for the core to obtain the key's attributes.
* `PSA_ERROR_DOES_NOT_EXIST`: the requested key does not exist.
* `PSA_ERROR_BUFFER_TOO_SMALL`: `key_buffer_size` is insufficient. This should not happen with a correct core and a properly configured driver.
* Other error codes such as `PSA_ERROR_COMMUNICATION_FAILURE` or `PSA_ERROR_HARDWARE_FAILURE` indicate a transient or permanent error.
The core will pass authorized requests to destroy a built-in key to the [`"destroy_key"`](#key-management-in-a-secure-element-with-storage) entry point if there is one. If built-in keys must not be destroyed, it is up to the driver to reject such requests.