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Halve size of mbedtls_error_pair_t

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All PSA crypto error codes fit comfortably in 16 bits and we have no plans
to ever change this. So use 16 bits to store them, which reduces
mbedtls_error_pair_t from 8 bytes to 4 bytes.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2023-05-02 21:38:11 +02:00
parent 8e076e4132
commit b567f8326d
1 changed files with 5 additions and 1 deletions
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6
include/mbedtls/psa_util.h
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@ -345,7 +345,11 @@ extern mbedtls_psa_drbg_context_t *const mbedtls_psa_random_state;
#endif /* !defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG) */
typedef struct {
psa_status_t psa_status;
/* Error codes used by PSA crypto are in -255..-128, fitting in 16 bits. */
int16_t psa_status;
/* Error codes used by Mbed TLS are in one of the ranges
* -127..-1 (low-level) or (-128) * (128..511) (high-level),
* fitting in 16 bits. */
int16_t mbedtls_error;
} mbedtls_error_pair_t;