component/bt: support BLE Application Layer Encryption key size check

components/bt/bluedroid/api/include/api/esp_gap_ble_api.h

@@ -287,6 +287,8 @@ typedef enum {
     ESP_BLE_SM_ONLY_ACCEPT_SPECIFIED_SEC_AUTH,
     /* Enable/Disable OOB support */
     ESP_BLE_SM_OOB_SUPPORT,
+    /* Appl encryption key size */
+    ESP_BLE_APP_ENC_KEY_SIZE,
     ESP_BLE_SM_MAX_PARAM,
 } esp_ble_sm_param_t;
 

components/bt/bluedroid/bta/dm/bta_dm_co.c

@@ -51,6 +51,7 @@ tBTE_APPL_CFG bte_appl_cfg = {
     BTM_BLE_MIN_KEY_SIZE,
     BTM_BLE_ONLY_ACCEPT_SPECIFIED_SEC_AUTH_DISABLE,
     BTM_BLE_OOB_DISABLE,
+    BTM_BLE_APPL_ENC_KEY_SIZE,
 };
 #endif
 
@@ -427,6 +428,17 @@ void bta_dm_co_ble_set_min_key_size(UINT8 ble_key_size)
 #endif  ///SMP_INCLUDED == TRUE
 }
 
+void bta_dm_co_ble_set_appl_enc_key_size(UINT8 ble_key_size)
+{
+#if (SMP_INCLUDED == TRUE)
+    if(ble_key_size >= bte_appl_cfg.ble_min_key_size && ble_key_size <= bte_appl_cfg.ble_max_key_size) {
+        bte_appl_cfg.ble_appl_enc_key_size = ble_key_size;
+    } else {
+        APPL_TRACE_ERROR("%s error:Invalid key size value, key_size =%d",__func__, ble_key_size);
+    }
+#endif  ///SMP_INCLUDED == TRUE
+}
+
 void bta_dm_co_ble_set_accept_auth_enable(UINT8 enable)
 {
 #if (SMP_INCLUDED == TRUE)

components/bt/bluedroid/bta/include/bta/bta_dm_co.h

@@ -214,4 +214,6 @@ extern UINT8 bta_dm_co_ble_get_accept_auth_enable(void);
 extern UINT8 bta_dm_co_ble_get_auth_req(void);
 
 extern void bta_dm_co_ble_oob_support(UINT8 enable);
+
+extern void bta_dm_co_ble_set_appl_enc_key_size(UINT8 ble_key_size);
 #endif

components/bt/bluedroid/btc/profile/std/gap/btc_gap_ble.c

@@ -1220,6 +1220,12 @@ void btc_gap_ble_call_handler(btc_msg_t *msg)
                 bta_dm_co_ble_oob_support(enable);
                 break;
             }
+            case ESP_BLE_APP_ENC_KEY_SIZE: {
+                uint8_t key_size = 0;
+                STREAM_TO_UINT8(key_size, value);
+                bta_dm_co_ble_set_appl_enc_key_size(key_size);
+                break;
+            }
             default:
                 break;
         }

components/bt/bluedroid/common/include/common/bte_appl.h

@@ -34,6 +34,7 @@ typedef struct {
     UINT8   ble_min_key_size;
     UINT8   ble_accept_auth_enable;
     UINT8   oob_support;
+    UINT8   ble_appl_enc_key_size;
 #endif
 
 } tBTE_APPL_CFG;

components/bt/bluedroid/stack/gatt/gatt_db.c

@@ -34,6 +34,7 @@
 #include "gatt_int.h"
 #include "stack/l2c_api.h"
 #include "btm_int.h"
+#include "common/bte_appl.h"
 
 /********************************************************************************
 **              L O C A L    F U N C T I O N     P R O T O T Y P E S            *
@@ -124,10 +125,15 @@ static tGATT_STATUS gatts_check_attr_readability(tGATT_ATTR16 *p_attr,
     tGATT_PERM      perm = p_attr->permission;
 
     UNUSED(offset);
+
+#if SMP_INCLUDED == TRUE
+    min_key_size = bte_appl_cfg.ble_appl_enc_key_size;
+#else
     min_key_size = (((perm & GATT_ENCRYPT_KEY_SIZE_MASK) >> 12));
     if (min_key_size != 0 ) {
         min_key_size += 6;
     }
+#endif
 
     if (!(perm & GATT_READ_ALLOWED)) {
         GATT_TRACE_ERROR( "GATT_READ_NOT_PERMIT\n");
@@ -1073,10 +1079,16 @@ tGATT_STATUS gatts_write_attr_perm_check (tGATT_SVC_DB *p_db, UINT8 op_code,
         while (p_attr != NULL) {
             if (p_attr->handle == handle) {
                 perm = p_attr->permission;
+
+            #if SMP_INCLUDED == TRUE
+                min_key_size = bte_appl_cfg.ble_appl_enc_key_size;
+            #else
                 min_key_size = (((perm & GATT_ENCRYPT_KEY_SIZE_MASK) >> 12));
                 if (min_key_size != 0 ) {
                     min_key_size += 6;
                 }
+
+            #endif
                 GATT_TRACE_DEBUG( "gatts_write_attr_perm_check p_attr->permission =0x%04x min_key_size==0x%04x",
                                   p_attr->permission,
                                   min_key_size);

components/bt/bluedroid/stack/include/stack/btm_api.h

@@ -1430,6 +1430,7 @@ typedef UINT8 tBTM_IO_CAP;
 #define BTM_BLE_RESPONDER_KEY_SIZE 15
 #define BTM_BLE_MAX_KEY_SIZE       16
 #define BTM_BLE_MIN_KEY_SIZE       7
+#define BTM_BLE_APPL_ENC_KEY_SIZE  7
 
 typedef UINT8 tBTM_AUTH_REQ;