public override IClaimsIdentity ProcessSignInResponse(string realm, string originalUrl, HttpContextBase httpContext) { var client = new YahooOpenIdClient(); AuthenticationResult result; try { result = client.VerifyAuthentication(httpContext); } catch (WebException wex) { throw new InvalidOperationException(new StreamReader(wex.Response.GetResponseStream()).ReadToEnd(), wex); } var claims = new List<Claim> { new Claim(System.IdentityModel.Claims.ClaimTypes.NameIdentifier, result.ExtraData["email"]) }; foreach (var claim in result.ExtraData) { claims.Add(new Claim("http://schemas.yahoo.com/" + claim.Key, claim.Value)); } return new ClaimsIdentity(claims, "Yahoo"); }