Ejemplo de código de validación de token de .net core jwt

Ejemplo 1: validar el token jwt c #

public static Task<IPrincipal> validateToken(string token)
        {
            ClaimsPrincipal principal = getPrincipal(token);
            if (principal == null)
                return null;
            ClaimsIdentity identity = null;
            try
            {
                identity = (ClaimsIdentity)principal.Identity;
                IPrincipal Iprincipal = new ClaimsPrincipal(identity);
                return Task.FromResult(Iprincipal);
            }
            catch (NullReferenceException)
            {
                return Task.FromResult<IPrincipal>(null);
            }
        }

 private static ClaimsPrincipal getPrincipal(string token)
        {
            try
            {
                JwtSecurityTokenHandler tokenHandler = new JwtSecurityTokenHandler();
                JwtSecurityToken jwtToken = (JwtSecurityToken)tokenHandler.ReadToken(token);
                if (jwtToken == null)
                    return null;
                byte[] key = Encoding.ASCII.GetBytes(config.jwtSecret);
                TokenValidationParameters parameters = new TokenValidationParameters()
                {
                    ValidIssuer = config.jwtIssuer,
                    ValidAudience = config.jwtIssuer,
                    ValidateLifetime = true,
                    RequireExpirationTime = true,
                    ValidateIssuer = true,
                    ValidateAudience = true,
                    IssuerSigningKey = new SymmetricSecurityKey(key),
                    ClockSkew = TimeSpan.Zero
                };
                SecurityToken securityToken;
                ClaimsPrincipal principal = tokenHandler.ValidateToken(token,
                      parameters, out securityToken);
                return principal;
            }
            catch
            {
                return null;
            }
  }

Ejemplo 2: validación de jwt token vb.net

class Program {

    static string key = "401b09eab3c013d4ca54922bb802bec8fd5318192b0a75f201d8b3727429090fb337591abd3e44453b954555b7a0812e1081c39b740293f765eae731f5a65ed1";

    static void Main(string[] args) {
        var stringToken = GenerateToken();
        ValidateToken(stringToken);
    }

    private static string GenerateToken() {
        var securityKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(key));

        var credentials = new SigningCredentials(securityKey, SecurityAlgorithms.HmacSha256);

        var header = new JwtHeader(credentials);

        var payload = new JwtPayload {
           { "some ", "hello "},
           { "scope", "world"},
        };

        var secToken = new JwtSecurityToken(header, payload);
        var handler = new JwtSecurityTokenHandler();

        return handler.WriteToken(secToken);

    }

    private static bool ValidateToken(string authToken) {
        var tokenHandler = new JwtSecurityTokenHandler();
        var validationParameters = GetValidationParameters();

        SecurityToken validatedToken;
        IPrincipal principal = tokenHandler.ValidateToken(authToken, validationParameters, out validatedToken);
        Thread.CurrentPrincipal = principal;
        return true;
    }

    private static TokenValidationParameters GetValidationParameters() {
        return new TokenValidationParameters() {
            //NOT A CLUE WHAT TO PLACE HERE
        };
    }
}

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