adding verification example

addess issue flagged in #41

example/CMakeLists.txt

@@ -8,3 +8,6 @@ target_link_libraries(print-claims jwt-cpp::jwt-cpp)
 
 add_executable(rsa-create rsa-create.cpp)
 target_link_libraries(rsa-create jwt-cpp::jwt-cpp)
+
+add_executable(rsa-verify rsa-verify.cpp)
+target_link_libraries(rsa-verify jwt-cpp::jwt-cpp)

example/rsa-create.cpp

@@ -49,4 +49,4 @@ YwIDAQAB
           .sign(jwt::algorithm::rs256(rsa_pub_key, rsa_priv_key, "", ""));
 
   std::cout << "token:\n" << token << std::endl;
-}
+}

example/rsa-verify.cpp

@@ -0,0 +1,61 @@
+#include <iostream>
+#include <jwt-cpp/jwt.h>
+
+int main(int argc, const char **argv) {
+  std::string rsa_priv_key = R"(-----BEGIN PRIVATE KEY-----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+FNt1aRdSlx4176R3nXyibQA1Vw+ztiUFowiP9WLoM3PtPZwwe4bGHmwGNHPIfwVG
+m+exf9XgKKespYbLhc45tuC08DATnXoYK7O1EnUINSFJRS8cezSI5eHcbQKBgQDC
+PgqHXZ2aVftqCc1eAaxaIRQhRmY+CgUjumaczRFGwVFveP9I6Gdi+Kca3DE3F9Pq
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+rK0/Ikt5ybqUzKCMJZg2VKGTxg==
+-----END PRIVATE KEY-----)";
+  std::string rsa_pub_key = R"(-----BEGIN PUBLIC KEY-----
+MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAuGbXWiK3dQTyCbX5xdE4
+yCuYp0AF2d15Qq1JSXT/lx8CEcXb9RbDddl8jGDv+spi5qPa8qEHiK7FwV2KpRE9
+83wGPnYsAm9BxLFb4YrLYcDFOIGULuk2FtrPS512Qea1bXASuvYXEpQNpGbnTGVs
+WXI9C+yjHztqyL2h8P6mlThPY9E9ue2fCqdgixfTFIF9Dm4SLHbphUS2iw7w1JgT
+69s7of9+I9l5lsJ9cozf1rxrXX4V1u/SotUuNB3Fp8oB4C1fLBEhSlMcUJirz1E8
+AziMCxS+VrRPDM+zfvpIJg3JljAh3PJHDiLu902v9w+Iplu1WyoB2aPfitxEhRN0
+YwIDAQAB
+-----END PUBLIC KEY-----)";
+
+  std::string token =
+      "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXUyJ9.eyJpc3MiOiJhdXRoMCJ9."
+      "VA2i1ui1cnoD6I3wnji1WAVCf29EekysvevGrT2GXqK1dDMc8"
+      "HAZCTQxa1Q8NppnpYV-hlqxh-X3Bb0JOePTGzjynpNZoJh2aHZD-"
+      "GKpZt7OO1Zp8AFWPZ3p8Cahq8536fD8RiBES9jRsvChZvOqA7gMcFc4"
+      "YD0iZhNIcI7a654u5yPYyTlf5kjR97prCf_OXWRn-bYY74zna4p_bP9oWCL4BkaoRcMxi-"
+      "IR7kmVcCnvbYqyIrKloXP2qPO442RBGqU7Ov9"
+      "sGQxiVqtRHKXZR9RbfvjrErY1KGiCp9M5i2bsUHadZEY44FE2jiOmx-"
+      "uc2z5c05CCXqVSpfCjWbh9gQ";
+
+  auto verify = jwt::verify()
+                    .allow_algorithm(jwt::algorithm::rs256(
+                        rsa_pub_key, rsa_priv_key, "", ""))
+                    .with_issuer("auth0");
+
+  auto decoded_token = jwt::decode(token);
+
+  verify.verify(decoded_token);
+}