How to encrypt JWT security token?

Question

I need to secure my web-token with signing and encryption. I wrote the next lines of code:

var tokenHandler = new JwtSecurityTokenHandler();
var tokenDescriptor = new SecurityTokenDescriptor
{
      Subject = new ClaimsIdentity(new[]
         {
             new Claim(ClaimTypes.Name, owner.Name),
             new Claim(ClaimTypes.Role, owner.RoleClaimType),
             new Claim("custom claim type", "custom content")
         }),
      TokenIssuerName = "self",
      AppliesToAddress = "http://www.example.com",
      Lifetime = new Lifetime(now, now.AddSeconds(60 * 3)),
      EncryptingCredentials = new X509EncryptingCredentials(new X509Certificate2(cert)),
      SigningCredentials = new X509SigningCredentials(cert1)
};
var token = (JwtSecurityToken)tokenHandler.CreateToken(tokenDescriptor);            
var tokenString = tokenHandler.WriteToken(token);

So, I am using some certificates, generated with makecert.exe. Then I read token string with another JwtSecurityTokenHandler:

var tokenHandlerDecr = new JwtSecurityTokenHandler();
var tok = tokenHandlerDecr.ReadToken(tokenString);

And token content is not encrypted (I can see json in tok variable under debugger). What am I doing wrong? How to encrypt token data?

Answer 1

My understanding is that Microsoft's JWT implementation doesn't currently support encryption (only signing).