reseting the security db

Author: paul-szczepanek-arm

features/FEATURE_BLE/ble/generic/FileSecurityDb.h

@@ -126,6 +126,8 @@ class FileSecurityDb : public SecurityDb {
 
     virtual void set_restore(bool reload);
 
+    virtual void reset();
+
 private:
     virtual uint8_t get_entry_count();
 

features/FEATURE_BLE/ble/generic/MemorySecurityDb.h

@@ -148,6 +148,16 @@ class MemorySecurityDb : public SecurityDb {
         }
     }
 
+
+    /* saving and loading from nvm */
+
+    virtual void reset() {
+        SecurityDb::reset();
+        for (size_t i = 0; i < MAX_ENTRIES; ++i) {
+            _entries[i] = entry_t();
+        }
+    }
+
 private:
     virtual uint8_t get_entry_count() {
         return MAX_ENTRIES;

features/FEATURE_BLE/ble/generic/SecurityDb.h

@@ -656,6 +656,15 @@ class SecurityDb {
      */
     virtual void set_restore(bool reload) { };
 
+    /**
+     * Reset the databse by removing all information
+     */
+    virtual void reset() {
+        _local_identity = SecurityEntryIdentity_t();
+        _local_csrk = csrk_t();
+        _local_sign_counter = 0;
+    }
+
 private:
     /**
      * Get an entry for a new connection not present in the db yet. This will find a free entry

features/FEATURE_BLE/source/generic/FileSecurityDb.cpp

@@ -304,6 +304,11 @@ void FileSecurityDb::set_restore(bool reload) {
     db_write(&reload, DB_OFFSET_RESTORE);
 }
 
+void FileSecurityDb::reset() {
+    SecurityDb::reset();
+    erase_db_file(_db_file);
+}
+
 /* helper functions */
 
 uint8_t FileSecurityDb::get_entry_count() {

features/FEATURE_BLE/source/generic/GenericSecurityManager.cpp

@@ -116,7 +116,9 @@ ble_error_t GenericSecurityManager::init(
 }
 
 ble_error_t GenericSecurityManager::reset(void) {
+    MBED_ASSERT(_db);
     _pal.reset();
+    _db->reset();
     SecurityManager::reset();
 
     return BLE_ERROR_NONE;