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psa: Rework psa_cipher_setup (1)

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Rework psa_cipher_setup in preparation of
calling the cipher setup based on cipher.c
through the interface of a PSA driver
cipher_setup entry point.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
This commit is contained in:
Ronald Cron 2020-10-01 16:14:50 +02:00
parent 0ff579590d
commit 590d3e56e9
1 changed files with 17 additions and 10 deletions
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27
library/psa_crypto.c
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@ -3441,6 +3441,12 @@ static psa_status_t psa_cipher_setup( psa_cipher_operation_t *operation,
psa_key_lifetime_is_external( slot->attr.lifetime ) )
goto exit;
psa_key_attributes_t attributes = {
.core = slot->attr
};
const uint8_t *key_buffer = slot->key.data;
psa_key_type_t key_type = attributes.core.type;
/* Proceed with initializing an mbed TLS cipher context if no driver is
* available for the given algorithm & key. */
mbedtls_cipher_init( &operation->ctx.cipher );
@ -3452,8 +3458,9 @@ static psa_status_t psa_cipher_setup( psa_cipher_operation_t *operation,
operation->alg = alg;
operation->mbedtls_in_use = 1;
key_bits = psa_get_key_slot_bits( slot );
cipher_info = mbedtls_cipher_info_from_psa( alg, slot->attr.type, key_bits, NULL );
key_bits = attributes.core.bits;
cipher_info = mbedtls_cipher_info_from_psa( alg, key_type,
key_bits, NULL );
if( cipher_info == NULL )
{
status = PSA_ERROR_NOT_SUPPORTED;
@ -3465,12 +3472,12 @@ static psa_status_t psa_cipher_setup( psa_cipher_operation_t *operation,
goto exit;
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_DES)
if( slot->attr.type == PSA_KEY_TYPE_DES && key_bits == 128 )
if( key_type == PSA_KEY_TYPE_DES && key_bits == 128 )
{
/* Two-key Triple-DES is 3-key Triple-DES with K1=K3 */
uint8_t keys[24];
memcpy( keys, slot->key.data, 16 );
memcpy( keys + 16, slot->key.data, 8 );
memcpy( keys, key_buffer, 16 );
memcpy( keys + 16, key_buffer, 8 );
ret = mbedtls_cipher_setkey( &operation->ctx.cipher,
keys,
192, cipher_operation );
@ -3478,8 +3485,7 @@ static psa_status_t psa_cipher_setup( psa_cipher_operation_t *operation,
else
#endif
{
ret = mbedtls_cipher_setkey( &operation->ctx.cipher,
slot->key.data,
ret = mbedtls_cipher_setkey( &operation->ctx.cipher, key_buffer,
(int) key_bits, cipher_operation );
}
if( ret != 0 )
@ -3507,15 +3513,16 @@ static psa_status_t psa_cipher_setup( psa_cipher_operation_t *operation,
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CBC_NO_PADDING || MBEDTLS_PSA_BUILTIN_ALG_CBC_PKCS7 */
operation->block_size = ( PSA_ALG_IS_STREAM_CIPHER( alg ) ? 1 :
PSA_BLOCK_CIPHER_BLOCK_LENGTH( slot->attr.type ) );
PSA_BLOCK_CIPHER_BLOCK_LENGTH( key_type ) );
if( ( alg & PSA_ALG_CIPHER_FROM_BLOCK_FLAG ) != 0 &&
alg != PSA_ALG_ECB_NO_PADDING )
{
operation->iv_size = PSA_BLOCK_CIPHER_BLOCK_LENGTH( slot->attr.type );
operation->iv_size = PSA_BLOCK_CIPHER_BLOCK_LENGTH( key_type );
}
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_CHACHA20)
else
if( alg == PSA_ALG_STREAM_CIPHER && slot->attr.type == PSA_KEY_TYPE_CHACHA20 )
if( ( alg == PSA_ALG_STREAM_CIPHER ) &&
( key_type == PSA_KEY_TYPE_CHACHA20 ) )
operation->iv_size = 12;
#endif