AuroraMiddleware/mbedtls
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Add stub for new tls12_prf_generate_next_block

Browse Source
This commit is contained in:
Janos Follath 2019-06-17 12:58:10 +01:00
parent 6c6c8fceaa
commit 7742feea53
1 changed files with 44 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
library/psa_crypto.c
View File

@ -4125,6 +4125,50 @@ cleanup:
return( status );
}
#else
static psa_status_t psa_key_derivation_tls12_prf_generate_next_block(
psa_tls12_prf_key_derivation_t *tls12_prf,
psa_algorithm_t alg )
{
psa_algorithm_t hash_alg = PSA_ALG_HKDF_GET_HASH( alg );
uint8_t hash_length = PSA_HASH_SIZE( hash_alg );
psa_status_t status;
/* We can't be wanting more output after block 0xff, otherwise
* the capacity check in psa_key_derivation_output_bytes() would have
* prevented this call. It could happen only if the operation
* object was corrupted or if this function is called directly
* inside the library. */
if( tls12_prf->block_number == 0xff )
return( PSA_ERROR_BAD_STATE );
/* We need a new block */
++tls12_prf->block_number;
tls12_prf->offset_in_block = 0;
/* Recall the definition of the TLS-1.2-PRF from RFC 5246:
*
* PRF(secret, label, seed) = P_<hash>(secret, label + seed)
*
* P_hash(secret, seed) = HMAC_hash(secret, A(1) + seed) +
* HMAC_hash(secret, A(2) + seed) +
* HMAC_hash(secret, A(3) + seed) + ...
*
* A(0) = seed
* A(i) = HMAC_hash( secret, A(i-1) )
*
* The `psa_tls12_prf_key_derivation` structures saves the block
* `HMAC_hash(secret, A(i) + seed)` from which the output
* is currently extracted as `output_block`.
*/
(void) hash_length;
(void) status;
cleanup:
return( PSA_ERROR_NOT_SUPPORTED );
}
#endif /* PSA_PRE_1_0_KEY_DERIVATION */
#if defined(PSA_PRE_1_0_KEY_DERIVATION)