feat(nvs_flash): Added an API to deregister the NVS security scheme context

Author: laukik-hase

components/nvs_flash/include/nvs_flash.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2015-2023 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2015-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -278,6 +278,13 @@ esp_err_t nvs_flash_read_security_cfg(const esp_partition_t* partition, nvs_sec_
  */
 esp_err_t nvs_flash_register_security_scheme(nvs_sec_scheme_t *scheme_cfg);
 
+/**
+ * @brief Deregister the security scheme previously registered using
+ *        nvs_flash_register_security_scheme
+ *
+ */
+void nvs_flash_deregister_security_scheme(void);
+
 /**
  * @brief   Fetch the configuration structure for the default active
  *          security scheme for NVS encryption

components/nvs_flash/src/nvs_api.cpp

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2015-2024 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2015-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -736,6 +736,11 @@ extern "C" esp_err_t nvs_flash_register_security_scheme(nvs_sec_scheme_t *scheme
     return ESP_OK;
 }
 
+extern "C" void nvs_flash_deregister_security_scheme(void)
+{
+    memset(&nvs_sec_default_scheme_cfg, 0x00, sizeof(nvs_sec_scheme_t));
+}
+
 extern "C" nvs_sec_scheme_t *nvs_flash_get_default_security_scheme(void)
 {
     return &nvs_sec_default_scheme_cfg;

components/nvs_sec_provider/nvs_sec_provider.c

@@ -291,6 +291,7 @@ esp_err_t nvs_sec_provider_deregister(nvs_sec_scheme_t *sec_scheme_handle)
 
     free(sec_scheme_handle);
 
+    nvs_flash_deregister_security_scheme();
     return ESP_OK;
 }