CreativeCode.JWS HOW-TO

JWS Program.cs

using System;
using System.Text;
using CreativeCode.JWS;
using CreativeCode.JWK;
using CreativeCode.JWK.KeyParts;

namespace JWS_Run
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Implementation of RFC7515 (JSON Web Signature)");

            // A signature key (RSA/EC/OCT) is needed. This implementation always uses JWKs (RFC7517) to supply a key.
            var keyUse = PublicKeyUse.Signature;
            var keyOperations = new HashSet<KeyOperation>(new[] {KeyOperation.ComputeDigitalSignature, KeyOperation.VerifyDigitalSignature});
            var algorithm = Algorithm.ES256;
            var jwk = new JWK(algorithm, keyUse, keyOperations);

            // Provide custom Content-Type and content. "application/fhir+json" is only choosen as an example.
            // Create header based on supplied information. Exceptions may be thrown if required content is not proivided by the JWKProvider
            var joseHeader = new ProtectedJoseHeader(jwk, "application/fhir+json", SerializationOption.JwsCompactSerialization);
            var payload = Encoding.UTF8.GetBytes("payload");
            
            // Initialize JWS
            var jws = new JWS(new []{joseHeader}, payload);

            // Create digital signature
            jws.CalculateSignature();
            var jwsSignature = jws.Export();

            Console.WriteLine("Created JSON Web Signature: " + jwsSignature);
        }
    }
}