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PSA operation structures: move less-used fields to the end

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Move fields around to have fewer accesses outside the 128-element Thumb
direct access window.

In psa_hkdf_key_derivation_t, move the large fields (output_block, prk,
hmac) after the state bit-fields. Experimentally, it's slightly better
to put hmac last.

Other operations structures don't go outside the window, at least when not
considering nested structures.

Results (arm-none-eabi-gcc 7.3.1, build_arm_none_eabi_gcc_m0plus build):
library/psa_crypto.o: 16510 -> 16434 (diff: 76)

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2021-11-08 22:12:47 +01:00
parent f303c0ddeb
commit e3d9c9d99b
1 changed files with 3 additions and 3 deletions
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6
include/psa/crypto_struct.h
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@ -186,9 +186,6 @@ typedef struct
{
uint8_t *MBEDTLS_PRIVATE(info);
size_t MBEDTLS_PRIVATE(info_length);
struct psa_mac_operation_s MBEDTLS_PRIVATE(hmac);
uint8_t MBEDTLS_PRIVATE(prk)[PSA_HASH_MAX_SIZE];
uint8_t MBEDTLS_PRIVATE(output_block)[PSA_HASH_MAX_SIZE];
#if PSA_HASH_MAX_SIZE > 0xff
#error "PSA_HASH_MAX_SIZE does not fit in uint8_t"
#endif
@ -196,6 +193,9 @@ typedef struct
uint8_t MBEDTLS_PRIVATE(block_number);
unsigned int MBEDTLS_PRIVATE(state) : 2;
unsigned int MBEDTLS_PRIVATE(info_set) : 1;
uint8_t MBEDTLS_PRIVATE(output_block)[PSA_HASH_MAX_SIZE];
uint8_t MBEDTLS_PRIVATE(prk)[PSA_HASH_MAX_SIZE];
struct psa_mac_operation_s MBEDTLS_PRIVATE(hmac);
} psa_hkdf_key_derivation_t;
#endif /* MBEDTLS_PSA_BUILTIN_ALG_HKDF */