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Move is_sign and mac_size checking back to PSA core scope

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It makes sense to do the length checking in the core rather than expect
each driver to deal with it themselves. This puts the onus on the core to
dictate which algorithm/key combinations are valid before calling a driver.

Additionally, this commit also updates the psa_mac_sign_finish function
to better deal with output buffer sanitation, as per the review comments
on #4247.

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
This commit is contained in:
Steven Cooreman 2021-05-07 14:14:37 +02:00
parent c112315aeb
commit 72f736a191
5 changed files with 94 additions and 69 deletions
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4
include/psa/crypto_struct.h
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@ -137,10 +137,12 @@ struct psa_mac_operation_s
* ID value zero means the context is not valid or not assigned to
* any driver (i.e. none of the driver contexts are active). */
unsigned int id;
uint8_t mac_size;
unsigned int is_sign : 1;
psa_driver_mac_context_t ctx;
};
#define PSA_MAC_OPERATION_INIT {0, {0}}
#define PSA_MAC_OPERATION_INIT {0, 0, 0, {0}}
static inline struct psa_mac_operation_s psa_mac_operation_init( void )
{
const struct psa_mac_operation_s v = PSA_MAC_OPERATION_INIT;