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psa: include: Update and improve multipart-op struct design notes

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Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit is contained in:
Ronald Cron 2021-04-01 15:37:49 +02:00
parent dd3b539573
commit 980230e965
1 changed files with 15 additions and 7 deletions
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22
include/psa/crypto_struct.h
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@ -15,12 +15,20 @@
*
* <h3>Design notes about multipart operation structures</h3>
*
* Each multipart operation structure contains a `psa_algorithm_t alg`
* field which indicates which specific algorithm the structure is for.
* When the structure is not in use, `alg` is 0. Most of the structure
* consists of a union which is discriminated by `alg`.
* For multipart operations without driver delegation support, each multipart
* operation structure contains a `psa_algorithm_t alg` field which indicates
* which specific algorithm the structure is for. When the structure is not in
* use, `alg` is 0. Most of the structure consists of a union which is
* discriminated by `alg`.
*
* Note that when `alg` is 0, the content of other fields is undefined.
* For multipart operations with driver delegation support, each multipart
* operation structure contains an `unsigned int id` field indicating which
* driver got assigned to do the operation. When the structure is not in use,
* 'id' is 0. The structure contains also a driver context which is the union
* of the contexts of all drivers able to handle the type of multipart
* operation.
*
* Note that when `alg` or `id` is 0, the content of other fields is undefined.
* In particular, it is not guaranteed that a freshly-initialized structure
* is all-zero: we initialize structures to something like `{0, 0}`, which
* is only guaranteed to initializes the first member of the union;
@ -76,9 +84,9 @@ struct psa_hash_operation_s
/** Unique ID indicating which driver got assigned to do the
* operation. Since driver contexts are driver-specific, swapping
* drivers halfway through the operation is not supported.
* ID values are auto-generated in psa_driver_wrappers.h
* ID values are auto-generated in psa_driver_wrappers.h.
* ID value zero means the context is not valid or not assigned to
* any driver (i.e. none of the driver contexts are active). */
* any driver (i.e. the driver context is not active, in use). */
unsigned int id;
psa_driver_hash_context_t ctx;
};