JWT Authentication with RSA Keys

RSAAuth.cs

using System;
using System.Security.Cryptography;
using Microsoft.IdentityModel.JsonWebTokens;
using Microsoft.IdentityModel.Tokens;

public class RSAAuth
{
    [Fact]
    public void RSATest
    {
        var privateKeyBytes = Convert.FromBase64String("MIIEowIBAAKCAQEAyokLGrnqRUToy6kYNe/WyY3d0WEzXaUK+G2M8h4xtKGfPIYR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\nZXmKQ7kTqMt2GwN0uIXPt4W7rxcScaG1WivamJevWIrH/htpSL5s");

        using (var rsa = RSA.Create(2048))
        {
            rsa.ImportRSAPrivateKey(privateKeyBytes, out _);
            var key = new RsaSecurityKey(rsa);
            var handler = new JsonWebTokenHandler();
            var now = DateTime.UtcNow;

            var descriptor = new SecurityTokenDescriptor
            {
                Issuer = "me",
                Audience = "you",
                IssuedAt = now,
                NotBefore = now,
                Expires = now.AddMinutes(5),
                SigningCredentials = new SigningCredentials(key, SecurityAlgorithms.RsaSha256)
            };

            string jwt = handler.CreateToken(descriptor);

            TokenValidationResult result = handler.ValidateToken(jwt,
                new TokenValidationParameters
                {
                    ValidIssuer = "me",
                    ValidAudience = "you",
                    IssuerSigningKey = new RsaSecurityKey(key.Rsa.ExportParameters(false))
                });
        }
    }
}