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Move handling of 'SE' drivers into driver wrappers

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This is a more natural place for handling the drivers belonging to the
'previous' SE driver spec. It makes for a cleaner psa_crypto.c, and
potentially an easier overview of how to migrate from the old SE driver
interface to the 'opaque accelerator' interface.

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
This commit is contained in:
Steven Cooreman 2020-07-17 16:43:05 +02:00
parent d57203d955
commit 7a2505788c
2 changed files with 36 additions and 22 deletions
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23
library/psa_crypto.c
View file

@ -3638,10 +3638,6 @@ psa_status_t psa_sign_hash( psa_key_handle_t handle,
{ {
psa_key_slot_t *slot; psa_key_slot_t *slot;
psa_status_t status; psa_status_t status;
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
const psa_drv_se_t *drv;
psa_drv_se_context_t *drv_context;
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
*signature_length = signature_size; *signature_length = signature_size;
/* Immediately reject a zero-length signature buffer. This guarantees /* Immediately reject a zero-length signature buffer. This guarantees
@ -3671,24 +3667,7 @@ psa_status_t psa_sign_hash( psa_key_handle_t handle,
if( status != PSA_ERROR_NOT_SUPPORTED ) if( status != PSA_ERROR_NOT_SUPPORTED )
goto exit; goto exit;
#if defined(MBEDTLS_PSA_CRYPTO_SE_C) /* If the operation was not supported by any accelerator, try fallback. */
if( psa_get_se_driver( slot->attr.lifetime, &drv, &drv_context ) )
{
if( drv->asymmetric == NULL ||
drv->asymmetric->p_sign == NULL )
{
status = PSA_ERROR_NOT_SUPPORTED;
goto exit;
}
status = drv->asymmetric->p_sign( drv_context,
slot->data.se.slot_number,
alg,
hash, hash_length,
signature, signature_size,
signature_length );
}
else
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
#if defined(MBEDTLS_RSA_C) #if defined(MBEDTLS_RSA_C)
if( slot->attr.type == PSA_KEY_TYPE_RSA_KEY_PAIR ) if( slot->attr.type == PSA_KEY_TYPE_RSA_KEY_PAIR )
{ {

35
library/psa_crypto_driver_wrappers.c
View file

@ -28,9 +28,17 @@
#if defined(MBEDTLS_TEST_HOOKS) #if defined(MBEDTLS_TEST_HOOKS)
#undef MBEDTLS_PSA_CRYPTO_DRIVER_PRESENT #undef MBEDTLS_PSA_CRYPTO_DRIVER_PRESENT
#define MBEDTLS_PSA_CRYPTO_DRIVER_PRESENT #define MBEDTLS_PSA_CRYPTO_DRIVER_PRESENT
#undef MBEDTLS_PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT
#define MBEDTLS_PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT
#include "drivers/test_driver.h" #include "drivers/test_driver.h"
#endif #endif
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
#undef MBEDTLS_PSA_CRYPTO_DRIVER_PRESENT
#define MBEDTLS_PSA_CRYPTO_DRIVER_PRESENT
#include "psa_crypto_se.h"
#endif
/* Include driver definition file for each registered driver */ /* Include driver definition file for each registered driver */
/* Start delegation functions */ /* Start delegation functions */
@ -43,6 +51,30 @@ psa_status_t psa_driver_wrapper_sign_hash( psa_key_slot_t *slot,
size_t *signature_length ) size_t *signature_length )
{ {
#if defined(MBEDTLS_PSA_CRYPTO_DRIVER_PRESENT) #if defined(MBEDTLS_PSA_CRYPTO_DRIVER_PRESENT)
/* Try dynamically-registered SE interface first */
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
const psa_drv_se_t *drv;
psa_drv_se_context_t *drv_context;
if( psa_get_se_driver( slot->attr.lifetime, &drv, &drv_context ) )
{
if( drv->asymmetric == NULL ||
drv->asymmetric->p_sign == NULL )
{
/* Key is defined in SE, but we have no way to exercise it */
return PSA_ERROR_INVALID_ARGUMENT;
}
return( drv->asymmetric->p_sign( drv_context,
slot->data.se.slot_number,
alg,
hash, hash_length,
signature, signature_size,
signature_length ) );
}
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
/* Then try accelerator API */
#if defined(MBEDTLS_PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT)
psa_status_t status = PSA_ERROR_INVALID_ARGUMENT; psa_status_t status = PSA_ERROR_INVALID_ARGUMENT;
psa_key_location_t location = PSA_KEY_LIFETIME_GET_LOCATION(slot->attr.lifetime); psa_key_location_t location = PSA_KEY_LIFETIME_GET_LOCATION(slot->attr.lifetime);
psa_key_attributes_t attributes = { psa_key_attributes_t attributes = {
@ -87,6 +119,9 @@ psa_status_t psa_driver_wrapper_sign_hash( psa_key_slot_t *slot,
/* Key is declared with a lifetime not known to us */ /* Key is declared with a lifetime not known to us */
return status; return status;
} }
#else /* MBEDTLS_PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT */
return PSA_ERROR_NOT_SUPPORTED;
#endif /* MBEDTLS_PSA_CRYPTO_ACCELERATOR_DRIVER_PRESENT */
#else /* MBEDTLS_PSA_CRYPTO_DRIVER_PRESENT */ #else /* MBEDTLS_PSA_CRYPTO_DRIVER_PRESENT */
(void)slot; (void)slot;
(void)alg; (void)alg;