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Store key sizes in 16 bits in attributes

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This is larger than the maximum key size introduced in the previous
commit, by design.

Make some room for flags (not used yet).
This commit is contained in:
Gilles Peskine 2019-07-30 17:42:47 +02:00
parent c744d99386
commit 68cc433b5b
2 changed files with 18 additions and 7 deletions
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23
include/psa/crypto_struct.h
View file

@ -309,10 +309,17 @@ static inline struct psa_key_policy_s psa_key_policy_init( void )
return( v );
}
/* The type used internally for key sizes.
* Public interfaces use size_t, but internally we use a smaller type. */
typedef uint16_t psa_key_bits_t;
/* The maximum value of the type used to represent bit-sizes.
* This is used to mark an invalid key size. */
#define PSA_KEY_BITS_TOO_LARGE ( (psa_key_bits_t) ( -1 ) )
/* The maximum size of a key in bits.
* This is a whole number of bytes, to facilitate some calculations
* such as the maximum size of key data in storage.
*/
* Currently defined as the maximum that can be represented, rounded down
* to a whole number of bytes.
* This is an uncast value so that it can be used in preprocessor
* conditionals. */
#define PSA_MAX_KEY_BITS 0xfff8
typedef struct
@ -321,10 +328,11 @@ typedef struct
psa_key_lifetime_t lifetime;
psa_key_id_t id;
psa_key_policy_t policy;
size_t bits;
psa_key_bits_t bits;
uint16_t flags;
} psa_core_key_attributes_t;
#define PSA_CORE_KEY_ATTRIBUTES_INIT {0, 0, 0, {0, 0, 0}, 0}
#define PSA_CORE_KEY_ATTRIBUTES_INIT {0, 0, 0, {0, 0, 0}, 0, 0}
struct psa_key_attributes_s
{
@ -426,7 +434,10 @@ static inline psa_key_type_t psa_get_key_type(
static inline void psa_set_key_bits(psa_key_attributes_t *attributes,
size_t bits)
{
attributes->core.bits = bits;
if( bits > PSA_MAX_KEY_BITS )
attributes->core.bits = PSA_KEY_BITS_TOO_LARGE;
else
attributes->core.bits = (psa_key_bits_t) bits;
}
static inline size_t psa_get_key_bits(

2
library/psa_crypto.c
View file

@ -710,7 +710,7 @@ psa_status_t psa_import_key_into_slot( psa_key_slot_t *slot,
/* Ensure that the bytes-to-bit conversion doesn't overflow. */
if( data_length > SIZE_MAX / 8 )
return( PSA_ERROR_NOT_SUPPORTED );
/* Ensure that the key is not overly large. */
/* Ensure that the bit size fits in its representation type. */
if( bit_size > PSA_MAX_KEY_BITS )
return( PSA_ERROR_NOT_SUPPORTED );
status = prepare_raw_data_slot( slot->type, bit_size,