ElinEncoder.cs

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using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
 
public class ElinEncoder
{
    private const string key = "123456789012345678901234";
 
    private const string iv = "12345678";
 
    public static string AesEncrypt(string srcStr)
    {
        TripleDESCryptoServiceProvider tripleDESCryptoServiceProvider = new TripleDESCryptoServiceProvider();
        byte[] bytes = Encoding.UTF8.GetBytes(srcStr);
        MemoryStream memoryStream = new MemoryStream();
        CryptoStream cryptoStream = new CryptoStream(memoryStream, tripleDESCryptoServiceProvider.CreateEncryptor(Encoding.UTF8.GetBytes("123456789012345678901234"), Encoding.UTF8.GetBytes("12345678")), CryptoStreamMode.Write);
        cryptoStream.Write(bytes, 0, bytes.Length);
        cryptoStream.Close();
        byte[] inArray = memoryStream.ToArray();
        memoryStream.Close();
        return Convert.ToBase64String(inArray);
    }
 
    public static string AesDecrypt(string encStr)
    {
        TripleDESCryptoServiceProvider tripleDESCryptoServiceProvider = new TripleDESCryptoServiceProvider();
        byte[] array = Convert.FromBase64String(encStr);
        MemoryStream memoryStream = new MemoryStream();
        CryptoStream cryptoStream = new CryptoStream(memoryStream, tripleDESCryptoServiceProvider.CreateDecryptor(Encoding.UTF8.GetBytes("123456789012345678901234"), Encoding.UTF8.GetBytes("12345678")), CryptoStreamMode.Write);
        cryptoStream.Write(array, 0, array.Length);
        cryptoStream.Close();
        byte[] bytes = memoryStream.ToArray();
        memoryStream.Close();
        return Encoding.UTF8.GetString(bytes);
    }
 
    public static string GetCode(int idBacker, int index)
    {
        return AesEncrypt(idBacker.ToString("0000") + index).TrimEnd('=');
    }
 
    public static string GetID(string code)
    {
        return AesDecrypt(code + "=");
    }
 
    public static bool IsValid(string code)
    {
        try
        {
            int result;
            return int.TryParse(AesDecrypt(code + "="), out result);
        }
        catch
        {
        }
        return false;
    }
}