Add hook for signing using secure element

Author: dgreen-arm

library/psa_crypto.c

@@ -2997,6 +2997,7 @@ psa_status_t psa_asymmetric_sign( psa_key_handle_t handle,
 {
     psa_key_slot_t *slot;
     psa_status_t status;
+    const psa_se_drv_table_entry_t *driver = NULL;
 
     *signature_length = signature_size;
 
@@ -3009,6 +3010,24 @@ psa_status_t psa_asymmetric_sign( psa_key_handle_t handle,
         goto exit;
     }
 
+#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
+    driver = psa_get_se_driver_entry( slot->lifetime );
+    if( driver != NULL )
+    {
+        const psa_drv_se_t *drv = psa_get_se_driver_methods( driver );
+        if( drv->asymmetric == NULL ||
+            drv->asymmetric->p_sign == NULL )
+        {
+            status = PSA_ERROR_NOT_SUPPORTED;
+            goto exit;
+        }
+        status = drv->asymmetric->p_sign(
+            slot->data.se.slot_number, alg, hash, hash_length, signature,
+            signature_size, signature_length );
+        goto exit;
+    }
+    else
+#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
 #if defined(MBEDTLS_RSA_C)
     if( slot->type == PSA_KEY_TYPE_RSA_KEY_PAIR )
     {