add get ArduinoIoTCloud jwt

Author: fabik111

src/utility/SElementArduinoCloudJWT.cpp

@@ -0,0 +1,23 @@
+/*
+  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 "SElementArduinoCloudJWT.h"
+
+constexpr char JWT_HEADER[] = "{\"alg\":\"ES256\",\"typ\":\"JWT\"}";
+String getAIoTCloudJWT(SecureElement &se, String issuer, uint64_t iat, uint8_t slot)
+{
+  SElementJWS jws;
+  String jwtClaim = "{\"iat\":";
+  jwtClaim += String((uint32_t)iat);
+  jwtClaim += ",\"iss\":\"";
+  jwtClaim += issuer;
+  jwtClaim += "\"}";
+  String token = jws.sign(se, slot, JWT_HEADER, jwtClaim.c_str());
+  return token;
+}

src/utility/SElementArduinoCloudJWT.h

@@ -0,0 +1,17 @@
+/*
+  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_AIoTCloud_JWT_H_
+#define SECURE_ELEMENT_AIoTCloud_JWT_H_
+#include "SElementJWS.h"
+
+String getAIoTCloudJWT(SecureElement &se, String issuer, uint64_t iat, uint8_t slot = 1);
+
+#endif