using System;

using System.IO;

using System.Text;

using System.Web;

using System.Security.Cryptography;

public class Program

{

    protected static string APIKey = "fromnet7";

    protected static string SecretKey = "nei5XieQuoGhah1u";

    protected static string SecretFixed = "@portale_unicoop_tirreno";

    protected static string BaseUrlLocal = "https://local.portale-unicoop.netseven.it";

    protected static string BaseUrlStaging = "https://portale-unicoop.netseven.it";

    protected static string BaseUrlProd = "https://unicooptirreno.it";

    public static void Main()

    {

        // 1) Handle form submit.

        // 2) Get submitted username and password

        // 3) Request access token by calling:

        //    https://<portal>/n7-sso-api/get-access-token/<api-key>

        // 4) Handle json replay

        //    ex: {

        //          "status":"OK",

        //          "error_code":"0000",

        //          "error_message":"",

        //          "data":{

        //              "token":"ODk1YjYzNjY0YjJjNWRlZg==",

        //              "tid":"46"

        //          }

        //         }

        string token = "ODk1YjYzNjY0YjJjNWRlZg==";

        string password = "password-criptata";

        string[] resultLocal = Program.Encrypt(token, password, Program.BaseUrlLocal);

        string[] resultStaging = Program.Encrypt(token, password, Program.BaseUrlStaging);

        string[] resultProd = Program.Encrypt(token, password, Program.BaseUrlProd);

    }

    protected static string[] Encrypt(string token, string clearText, string baseUrl) {

        Console.WriteLine("Encoding for: " + baseUrl);

        byte[] b = Convert.FromBase64String(token);

        string Part0Key = System.Text.Encoding.UTF8.GetString(b);

        string Part1Key = CalculateMD5Hash(Program.SecretKey + Program.SecretFixed);

        Part1Key = Part1Key.Substring(0, 16);

        Console.WriteLine("Key: " + Part0Key + " " + Part1Key);

        string KeyStr = Part0Key + Part1Key;

        //string ivStr = Guid.NewGuid().ToString().Substring(0, 16);

        byte[] key = System.Text.Encoding.UTF8.GetBytes(KeyStr);

        byte[] encryptedBytes = null;

        byte[] bytesToBeEncrypted = System.Text.Encoding.UTF8.GetBytes(clearText);

        string retStr = "";

        string ivStr = "";

        using (MemoryStream ms = new MemoryStream())

        {

            using (RijndaelManaged AES = new RijndaelManaged())

            {

                AES.KeySize = 256;

                AES.BlockSize = 256;

                AES.Key = key;

                AES.Mode = CipherMode.CBC;

                AES.Padding = PaddingMode.PKCS7;

                using (var cs = new CryptoStream(ms, AES.CreateEncryptor(), CryptoStreamMode.Write))

                {

                    cs.Write(bytesToBeEncrypted, 0, bytesToBeEncrypted.Length);

                    cs.Close();

                }

                encryptedBytes = ms.ToArray();

                retStr = Convert.ToBase64String(encryptedBytes);

                ivStr = Convert.ToBase64String(AES.IV);

                string data = HttpUtility.UrlEncode(Part0Key+","+retStr+","+ivStr);

                Console.WriteLine(retStr);

                Console.WriteLine(baseUrl + "/n7-sso-api/test-decrypt2/"+Program.APIKey+"?d="+data);

            }

        }

        Console.WriteLine("***********************");

        return new string[] {retStr, ivStr};

    }

    protected static string CalculateMD5Hash(string input)

    {

        // step 1, calculate MD5 hash from input

        MD5 md5 = System.Security.Cryptography.MD5.Create();

        byte[] inputBytes = System.Text.Encoding.UTF8.GetBytes(input);

        byte[] hash = md5.ComputeHash(inputBytes);

        // step 2, convert byte array to hex string

        StringBuilder sb = new StringBuilder();

        for (int i = 0; i < hash.Length; i++)

        {

            sb.Append(hash[i].ToString("x2"));

        }

        return sb.ToString();

    }

}