SecureElement: add utility class to read and write ArduinoCloud device-id

Author: pennam

src/utility/SElementArduinoCloudDeviceId.cpp

@@ -0,0 +1,39 @@
+/*
+  This file is part of the Arduino_SecureElement library.
+
+  Copyright (c) 2024 Arduino SA
+
+  This Source Code Form is subject to the terms of the Mozilla Public
+  License, v. 2.0. If a copy of the MPL was not distributed with this
+  file, You can obtain one at http://mozilla.org/MPL/2.0/.
+*/
+
+/******************************************************************************
+ * INCLUDE
+ ******************************************************************************/
+
+#include <utility/SElementArduinoCloudDeviceId.h>
+
+int SElementArduinoCloudDeviceId::write(SecureElement & se, String & deviceId, const SElementArduinoCloudSlot idSlot)
+{
+  byte device_id_bytes[ECP256_CERT_COMPRESSED_CERT_SLOT_LENGTH] = {0};
+
+  deviceId.getBytes(device_id_bytes, sizeof(device_id_bytes));
+  
+  if (!se.writeSlot(static_cast<int>(idSlot), device_id_bytes, sizeof(device_id_bytes))) {
+    return 0;
+  }
+  return 1;
+}
+
+int SElementArduinoCloudDeviceId::read(SecureElement & se, String & deviceId, const SElementArduinoCloudSlot idSlot)
+{
+  byte device_id_bytes[ECP256_CERT_COMPRESSED_CERT_SLOT_LENGTH] = {0};
+
+  if (!se.readSlot(static_cast<int>(idSlot), device_id_bytes, sizeof(device_id_bytes))) {
+    return 0;
+  }
+
+  deviceId = String(reinterpret_cast<char *>(device_id_bytes));
+  return 1;
+}

src/utility/SElementArduinoCloudDeviceId.h

@@ -0,0 +1,33 @@
+/*
+  This file is part of the Arduino_SecureElement library.
+
+  Copyright (c) 2024 Arduino SA
+
+  This Source Code Form is subject to the terms of the Mozilla Public
+  License, v. 2.0. If a copy of the MPL was not distributed with this
+  file, You can obtain one at http://mozilla.org/MPL/2.0/.
+*/
+
+#ifndef SECURE_ELEMENT_ARDUINO_CLOUD_DEVICE_ID_H_
+#define SECURE_ELEMENT_ARDUINO_CLOUD_DEVICE_ID_H_
+
+/******************************************************************************
+ * INCLUDE
+ ******************************************************************************/
+
+#include <utility/SElementArduinoCloud.h>
+
+ /******************************************************************************
+ * CLASS DECLARATION
+ ******************************************************************************/
+
+class SElementArduinoCloudDeviceId
+{
+public:
+
+  static int write(SecureElement & se, String & deviceId, const SElementArduinoCloudSlot idSlot);
+  static int read(SecureElement & se, String & deviceId, const SElementArduinoCloudSlot idSlot);
+
+};
+
+#endif /* SECURE_ELEMENT_ARDUINO_CLOUD_DEVICE_ID_H_ */