Converting node.js Jwt example to .Net - asp.net

Question

I am trying to use a web api. They require that I use Jwt tokens. I am trying to do this in a asp.net 4.5.2 web app on azure. I have downloaded the Microsoft.IdentityModel.Tokens Nuget package and would like to use it to generate the needed tokens.
The web api I am trying to use has an example in node.js on how to generate the proper token. Here is their example:
var jwt = require('jsonwebtoken');
var payload = {
iss: api_key,
exp: ((new Date()).getTime() + 5000)
};
//Automatically creates header, and returns JWT
var token = jwt.sign(payload, api_secret);
All of the examples for the nuget package do a ton more than what is shown in the node.js example. Things like creating a secret value, claims identity, signing credentials and all kinds of other stuff.
I have the api_key value and the api_secret value. Can someone please tell me how to do the same thing using the nuget package as what they show using node.js?

Answer 1

After doing some research I think I have a solution. This is the simplest it gets in c# unfortunately, but I think its a passable solution considering we are talking apples and oranges. It seems C# is twice as verbose about the options and doesn't have sensible defaults for anything.
using System;
using System.IdentityModel.Tokens.Jwt;
using Microsoft.IdentityModel.Tokens;
namespace stackoverflow
{
class Program
{
static void Main(string[] args)
{
String api_key = "apiKey123123";
String api_secret = "401b09eab3c013d4ca54922bb802bec8fd5318192b0a75f201d8b3727429090fb337591abd3e44453b954555b7a0812e1081c39b740293f765eae731f5a65ed1";
var signingKey = Convert.FromBase64String(api_secret);
JwtHeader jwtHeader = new JwtHeader(
new SigningCredentials(
new SymmetricSecurityKey(signingKey),
SecurityAlgorithms.HmacSha256Signature
)
);
JwtPayload jwtPayload = new JwtPayload {
{"iss", api_key},
{"exp", ((DateTimeOffset)DateTime.UtcNow).AddMilliseconds(5000).ToUnixTimeMilliseconds() }
};
var jwt = new JwtSecurityToken(jwtHeader, jwtPayload);
var jwtHandler = new JwtSecurityTokenHandler();
Console.Write(jwtHandler.WriteToken(jwt));
Console.ReadLine();
}
}
}
Only import was this package:
<PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="5.2.1" />