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Use psa_core_key_attributes_t in key slots in memory

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Change the type of key slots in memory to use
psa_core_key_attributes_t rather than separate fields. The goal is to
simplify some parts of the code. This commit only does the mechanical
replacement, not the substitution.

The bit-field `allocate` is now a flag `PSA_KEY_SLOT_FLAG_ALLOCATED`
in the `flags` field.

Write accessor functions for flags.

Key slots now contain a bit size field which is currently unused.
Subsequent commits will make use of it.
This commit is contained in:
Gilles Peskine
2019-07-30 20:06:31 +02:00
parent 68cc433b5b
commit 8e3387029d
3 changed files with 156 additions and 104 deletions
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60
library/psa_crypto_core.h
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@@ -39,11 +39,7 @@
*/
typedef struct
{
psa_key_type_t type;
psa_key_lifetime_t lifetime;
psa_key_file_id_t persistent_storage_id;
psa_key_policy_t policy;
unsigned allocated : 1;
psa_core_key_attributes_t attr;
union
{
/* Raw-data key (key_type_is_raw_bytes() in psa_crypto.c) */
@@ -69,6 +65,60 @@ typedef struct
} data;
} psa_key_slot_t;
/** Flag for psa_key_slot_t::attr::core::flags indicating that the
* slot is in use. */
#define PSA_KEY_SLOT_FLAG_ALLOCATED ( (uint16_t) 0x0001 )
/** Retrieve flags from psa_key_slot_t::attr::core::flags.
*
* \param[in] slot The key slot to query.
* \param mask The mask of bits to extract.
*
* \return The key attribute flags in the given slot,
* bitwise-anded with \p mask.
*/
static inline uint16_t psa_key_slot_get_flags( const psa_key_slot_t *slot,
uint16_t mask )
{
return( slot->attr.flags & mask );
}
/** Set flags in psa_key_slot_t::attr::core::flags.
*
* \param[in,out] slot The key slot to modify.
* \param mask The mask of bits to modify.
* \param value The new value of the selected bits.
*/
static inline void psa_key_slot_set_flags( psa_key_slot_t *slot,
uint16_t mask,
uint16_t value )
{
slot->attr.flags = ( ( ~mask & slot->attr.flags ) |
( mask & value ) );
}
/** Turn on flags in psa_key_slot_t::attr::core::flags.
*
* \param[in,out] slot The key slot to modify.
* \param mask The mask of bits to set.
*/
static inline void psa_key_slot_set_bits_in_flags( psa_key_slot_t *slot,
uint16_t mask )
{
slot->attr.flags |= mask;
}
/** Turn off flags in psa_key_slot_t::attr::core::flags.
*
* \param[in,out] slot The key slot to modify.
* \param mask The mask of bits to clear.
*/
static inline void psa_key_slot_clear_bits( psa_key_slot_t *slot,
uint16_t mask )
{
slot->attr.flags &= ~mask;
}
/** Completely wipe a slot in memory, including its policy.
*
* Persistent storage is not affected.