Write private key

esp32_device/main/storage.c

@@ -7,6 +7,7 @@
 #define STORAGE_NAMESPACE "storage"
 
 #define DEV_NAME_KEY "dev_name"
+#define PRIVATE_KEY "prikey"
 
 bool storage_init()
 {
@@ -51,5 +52,35 @@ size_t storage_get_dev_name(char *dest)
 
     ESP_ERROR_CHECK(res);
 
+    return len;
+}
+
+void storage_set_priv_key(unsigned char *key, size_t len)
+{
+    nvs_handle_t my_handle;
+
+    ESP_ERROR_CHECK(nvs_open(STORAGE_NAMESPACE, NVS_READWRITE, &my_handle));
+
+    ESP_ERROR_CHECK(nvs_set_blob(my_handle, PRIVATE_KEY, key, len));
+
+    nvs_close(my_handle);
+}
+
+size_t storage_get_priv_key(unsigned char *key)
+{
+    nvs_handle_t my_handle;
+
+    ESP_ERROR_CHECK(nvs_open(STORAGE_NAMESPACE, NVS_READWRITE, &my_handle));
+
+    size_t len = (key == NULL ? 0 : PRV_KEY_DER_MAX_BYTES);
+    esp_err_t res = nvs_get_blob(my_handle, PRIVATE_KEY, key, &len);
+
+    nvs_close(my_handle);
+
+    if (res == ESP_ERR_NVS_NOT_FOUND || len == 0)
+        return 0;
+
+    ESP_ERROR_CHECK(res);
+
     return len;
 }