Add JWT class

common/jwt.hpp

@@ -0,0 +1,71 @@
+/***
+    This file is part of snapcast
+    Copyright (C) 2014-2024  Johannes Pohl
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#pragma once
+
+// local headers
+#include "common/json.hpp"
+
+// standard headers
+#include <string>
+
+
+/*
+https://datatracker.ietf.org/doc/html/rfc7518#section-3
+
+   +--------------+-------------------------------+--------------------+
+   | "alg" Param  | Digital Signature or MAC      | Implementation     |
+   | Value        | Algorithm                     | Requirements       |
+   +--------------+-------------------------------+--------------------+
+   | HS256        | HMAC using SHA-256            | Required           |
+   | HS384        | HMAC using SHA-384            | Optional           |
+   | HS512        | HMAC using SHA-512            | Optional           |
+   | RS256        | RSASSA-PKCS1-v1_5 using       | Recommended        |
+   |              | SHA-256                       |                    |
+   | RS384        | RSASSA-PKCS1-v1_5 using       | Optional           |
+   |              | SHA-384                       |                    |
+   | RS512        | RSASSA-PKCS1-v1_5 using       | Optional           |
+   |              | SHA-512                       |                    |
+   | ES256        | ECDSA using P-256 and SHA-256 | Recommended+       |
+   | ES384        | ECDSA using P-384 and SHA-384 | Optional           |
+   | ES512        | ECDSA using P-521 and SHA-512 | Optional           |
+   | PS256        | RSASSA-PSS using SHA-256 and  | Optional           |
+   |              | MGF1 with SHA-256             |                    |
+   | PS384        | RSASSA-PSS using SHA-384 and  | Optional           |
+   |              | MGF1 with SHA-384             |                    |
+   | PS512        | RSASSA-PSS using SHA-512 and  | Optional           |
+   |              | MGF1 with SHA-512             |                    |
+   | none         | No digital signature or MAC   | Optional           |
+   |              | performed                     |                    |
+   +--------------+-------------------------------+--------------------+
+*/
+
+// https://techdocs.akamai.com/iot-token-access-control/docs/generate-jwt-rsa-keys
+using json = nlohmann::json;
+
+class Jwt
+{
+public:
+    Jwt();
+
+    bool decode(const std::string& token);
+
+private:
+    json header_;
+    json payload_;
+};