创建C＃OAuth 2客户端

Question

我在C＃中创建自己的OAuth 2.0客户端。它确实有效，但我想知道授权的功能是否正确和安全。我应该做一些数据加密吗？我见过一些OAuth客户端正在进行HMACSHA1加密。对不起，但我是新手。这是代码：

public string getAccessToken()
{
    string uri = "http://192.168.1.89:8080/oauth/token";
    client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(
        "Basic", Convert.ToBase64String(System.Text.ASCIIEncoding.ASCII.GetBytes(
        string.Format("{0}:{1}", client_id, client_secret))));

    client.BaseAddress = new Uri(uri);

    var parameters = new Dictionary<string, string>();
    parameters["password"] = password;
    parameters["username"] = username;
    parameters["grant_type"] = grant_type;
    parameters["scope"] = scope;
    parameters["client_id"] = client_id;
    parameters["client_secret"] = client_secret;

    var response = client.PostAsync(uri, new FormUrlEncodedContent(parameters)).Result;
    Console.WriteLine((response.StatusCode.ToString()));
    string resultContent = response.Content.ReadAsStringAsync().Result;
    Console.WriteLine(resultContent);

    string s = "access_token\":\"";
    string token = resultContent.Substring(resultContent.IndexOf(s) + s.Length, tokenLength);
    return token;
}