using System;

using System.Security.Cryptography;

using System.Text;

​

​

public class EncHelper

{

    string ENCRYPTION_KEY { get; set; }

    static UTF8Encoding UTF = new UTF8Encoding();

     public  void Main(string[] args)

    {

        this.ENCRYPTION_KEY = "2022520552021359";

         this.GetEncryptedString("{\"Username\":\"8141931512\",\"Password\":\"270884\"}");

    }

​

     internal string GetEncryptedString(string InputString)

    {

        byte[] Encrypted_Bytes = Encrypt(InputString);

        string Encrypted_Text = Convert.ToBase64String(Encrypted_Bytes);

        //return HttpUtility.UrlEncode(Encrypted_Text);

        Console.WriteLine (Encrypted_Text);

        return Encrypted_Text;

    }

​

    byte[] Encrypt(string data)

    {

        RijndaelManaged rijndaelCipher = new RijndaelManaged();

        rijndaelCipher.Mode = CipherMode.CBC; //remember this parameter

        rijndaelCipher.Padding = PaddingMode.PKCS7; //remember this parameter

​

        rijndaelCipher.KeySize = 0x80;

        rijndaelCipher.BlockSize = 0x80;

        byte[] pwdBytes = Encoding.UTF8.GetBytes(ENCRYPTION_KEY);

        byte[] keyBytes = new byte[0x10];

        int len = pwdBytes.Length;

​

        if (len > keyBytes.Length)

        {

            len = keyBytes.Length;

        }

​

        Array.Copy(pwdBytes, keyBytes, len);

        rijndaelCipher.Key = keyBytes;

        rijndaelCipher.IV = keyBytes;

        ICryptoTransform transform = rijndaelCipher.CreateEncryptor();

        byte[] plainText = Encoding.UTF8.GetBytes(data);

        return transform.TransformFinalBlock(plainText, 0, plainText.Length);

    }

}

​