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Make HKDF use the generic MAC API

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Such that the underlying HMAC can be accelerated if such a driver is present

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
This commit is contained in:
Steven Cooreman 2021-04-29 19:11:25 +02:00
parent ac8d82a6f8
commit d1ed1d935f
2 changed files with 68 additions and 34 deletions
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2
include/psa/crypto_struct.h
View File

@ -173,7 +173,7 @@ typedef struct
{
uint8_t *info;
size_t info_length;
mbedtls_psa_hmac_operation_t hmac;
psa_mac_operation_t hmac;
uint8_t prk[PSA_HASH_MAX_SIZE];
uint8_t output_block[PSA_HASH_MAX_SIZE];
#if PSA_HASH_MAX_SIZE > 0xff

64
library/psa_crypto.c
View File

@ -3213,7 +3213,7 @@ psa_status_t psa_key_derivation_abort( psa_key_derivation_operation_t *operation
if( PSA_ALG_IS_HKDF( kdf_alg ) )
{
mbedtls_free( operation->ctx.hkdf.info );
status = psa_hmac_abort_internal( &operation->ctx.hkdf.hmac );
status = psa_mac_abort( &operation->ctx.hkdf.hmac );
}
else
#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_HKDF */
@ -3285,6 +3285,7 @@ static psa_status_t psa_key_derivation_hkdf_read( psa_hkdf_key_derivation_t *hkd
size_t output_length )
{
uint8_t hash_length = PSA_HASH_LENGTH( hash_alg );
size_t hmac_output_length;
psa_status_t status;
if( hkdf->state < HKDF_STATE_KEYED || ! hkdf->info_set )
@ -3314,31 +3315,42 @@ static psa_status_t psa_key_derivation_hkdf_read( psa_hkdf_key_derivation_t *hkd
/* We need a new block */
++hkdf->block_number;
hkdf->offset_in_block = 0;
status = psa_hmac_setup_internal( &hkdf->hmac,
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_set_key_type( &attributes, PSA_KEY_TYPE_HMAC );
psa_set_key_bits( &attributes,
PSA_BYTES_TO_BITS( hash_length ) );
psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_SIGN_HASH );
status = psa_driver_wrapper_mac_sign_setup( &hkdf->hmac,
&attributes,
hkdf->prk, hash_length,
hash_alg );
PSA_ALG_HMAC( hash_alg ) );
psa_reset_key_attributes( &attributes );
if( status != PSA_SUCCESS )
return( status );
if( hkdf->block_number != 1 )
{
status = psa_hmac_update_internal( &hkdf->hmac,
status = psa_mac_update( &hkdf->hmac,
hkdf->output_block,
hash_length );
if( status != PSA_SUCCESS )
return( status );
}
status = psa_hmac_update_internal( &hkdf->hmac,
status = psa_mac_update( &hkdf->hmac,
hkdf->info,
hkdf->info_length );
if( status != PSA_SUCCESS )
return( status );
status = psa_hmac_update_internal( &hkdf->hmac,
status = psa_mac_update( &hkdf->hmac,
&hkdf->block_number, 1 );
if( status != PSA_SUCCESS )
return( status );
status = psa_hmac_finish_internal( &hkdf->hmac,
status = psa_mac_sign_finish( &hkdf->hmac,
hkdf->output_block,
sizeof( hkdf->output_block ) );
sizeof( hkdf->output_block ),
&hmac_output_length );
if( status != PSA_SUCCESS )
return( status );
}
@ -3778,33 +3790,55 @@ static psa_status_t psa_hkdf_input( psa_hkdf_key_derivation_t *hkdf,
case PSA_KEY_DERIVATION_INPUT_SALT:
if( hkdf->state != HKDF_STATE_INIT )
return( PSA_ERROR_BAD_STATE );
status = psa_hmac_setup_internal( &hkdf->hmac,
else
{
/* In a scope block due to scope-local attributes variable */
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_set_key_type( &attributes, PSA_KEY_TYPE_HMAC );
psa_set_key_bits( &attributes,
PSA_BYTES_TO_BITS( data_length ) );
psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_SIGN_HASH );
status = psa_driver_wrapper_mac_sign_setup(
&hkdf->hmac,
&attributes,
data, data_length,
hash_alg );
PSA_ALG_HMAC( hash_alg ) );
psa_reset_key_attributes( &attributes );
if( status != PSA_SUCCESS )
return( status );
hkdf->state = HKDF_STATE_STARTED;
return( PSA_SUCCESS );
}
case PSA_KEY_DERIVATION_INPUT_SECRET:
/* If no salt was provided, use an empty salt. */
if( hkdf->state == HKDF_STATE_INIT )
{
status = psa_hmac_setup_internal( &hkdf->hmac,
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_set_key_type( &attributes, PSA_KEY_TYPE_HMAC );
psa_set_key_bits( &attributes, 0 );
psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_SIGN_HASH );
status = psa_driver_wrapper_mac_sign_setup(
&hkdf->hmac,
&attributes,
NULL, 0,
hash_alg );
PSA_ALG_HMAC( hash_alg ) );
psa_reset_key_attributes( &attributes );
if( status != PSA_SUCCESS )
return( status );
hkdf->state = HKDF_STATE_STARTED;
}
if( hkdf->state != HKDF_STATE_STARTED )
return( PSA_ERROR_BAD_STATE );
status = psa_hmac_update_internal( &hkdf->hmac,
status = psa_mac_update( &hkdf->hmac,
data, data_length );
if( status != PSA_SUCCESS )
return( status );
status = psa_hmac_finish_internal( &hkdf->hmac,
status = psa_mac_sign_finish( &hkdf->hmac,
hkdf->prk,
sizeof( hkdf->prk ) );
sizeof( hkdf->prk ),
&data_length );
if( status != PSA_SUCCESS )
return( status );
hkdf->offset_in_block = PSA_HASH_LENGTH( hash_alg );