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Work around bug in PSA_MAC_LENGTH()

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Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
This commit is contained in:
Manuel Pégourié-Gonnard 2022-02-01 13:08:21 +01:00
parent 12ec5719e7
commit f6ea19c66c
1 changed files with 6 additions and 7 deletions
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13
programs/psa/hmac_demo.c
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@ -102,11 +102,10 @@ void print_buf( const char *title, uint8_t *buf, size_t len )
psa_status_t hmac_demo(void)
{
psa_status_t status;
#define ALG PSA_ALG_HMAC(PSA_ALG_SHA_256)
const psa_algorithm_t alg = ALG;
// compilers with insufficient C99 support don't accept the const variable
// 'alg' here, so use a macro instead in order to pacify them
uint8_t out[PSA_MAC_LENGTH(PSA_KEY_TYPE_HMAC, 8 * sizeof( key_bytes ), ALG)];
const psa_algorithm_t alg = PSA_ALG_HMAC(PSA_ALG_SHA_256);
uint8_t out[PSA_MAC_MAX_SIZE]; // safe but not optimal
/* PSA_MAC_LENGTH(PSA_KEY_TYPE_HMAC, 8 * sizeof( key_bytes ), alg)
* should work but see https://github.com/ARMmbed/mbedtls/issues/4320 */
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_key_id_t key = 0;
@ -130,14 +129,14 @@ psa_status_t hmac_demo(void)
PSA_CHECK( psa_mac_update( &op, msg1_part1, sizeof( msg1_part1 ) ) );
PSA_CHECK( psa_mac_update( &op, msg1_part2, sizeof( msg1_part2 ) ) );
PSA_CHECK( psa_mac_sign_finish( &op, out, sizeof( out ), &out_len ) );
print_buf( "msg1", out, sizeof( out ) );
print_buf( "msg1", out, out_len );
/* compute HMAC(key, msg2_part1 | msg2_part2) */
PSA_CHECK( psa_mac_sign_setup( &op, key, alg ) );
PSA_CHECK( psa_mac_update( &op, msg2_part1, sizeof( msg2_part1 ) ) );
PSA_CHECK( psa_mac_update( &op, msg2_part2, sizeof( msg2_part2 ) ) );
PSA_CHECK( psa_mac_sign_finish( &op, out, sizeof( out ), &out_len ) );
print_buf( "msg2", out, sizeof( out ) );
print_buf( "msg2", out, out_len );
exit:
psa_mac_abort( &op ); // needed on error, harmless on success