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Store the key size in the slot in memory

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There is now a field for the key size in the key slot in memory. Use
it.

This makes psa_get_key_attributes() marginally faster at the expense
of memory that is available anyway in the current memory layout (16
bits for the size, 16 bits for flags). That's not the goal, though:
the goal is to simplify the code, in particular to make it more
uniform between transparent keys (whose size can be recomputed) and
keys in secure elements (whose size cannot be recomputed).

For keys in a secure element, the bit size is now saved by serializing
the type psa_key_bits_t (which is an alias for uint16_t) rather than
size_t.
This commit is contained in:
Gilles Peskine
2019-07-30 21:32:04 +02:00
parent 2431859dc7
commit b46bef2f76
4 changed files with 95 additions and 35 deletions
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9
library/psa_crypto_se.h
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@ -171,4 +171,13 @@ psa_status_t psa_save_se_persistent_data(
*/
psa_status_t psa_destroy_se_persistent_data( psa_key_lifetime_t lifetime );
/** The storage representation of a key whose data is in a secure element.
*/
typedef struct
{
uint8_t slot_number[sizeof( psa_key_slot_number_t )];
uint8_t bits[sizeof( psa_key_bits_t )];
} psa_se_key_data_storage_t;
#endif /* PSA_CRYPTO_SE_H */