using System;

using System.Security.Cryptography;

using System.Text;

using System.IO;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(Encrypt("ANKIT.SIDOLA@SE1.BP.COM"));

        Console.WriteLine(Decrypt("j+kKWRxIpuy2qG5rTNtvI77zXgDFwAR2TyhxSsKGYQu7h6SXqvvNDGAskl354d9Z"));

    }

    public static string Encrypt(string clearText)

    {

        string EncryptionKey = "b14ca5898a4e4133bbce2ea2315a1916";

        byte[] clearBytes = Encoding.Unicode.GetBytes(clearText);

        using (Aes encryptor = Aes.Create())

        {

            Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });

            encryptor.Key = pdb.GetBytes(32);

            encryptor.IV = pdb.GetBytes(16);

            using (MemoryStream ms = new MemoryStream())

            {

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

                {

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

                    cs.Close();

                }

                clearText = Convert.ToBase64String(ms.ToArray());

            }

        }

        return clearText;

    }

    public static string Decrypt(string cipherText)

        {

            string EncryptionKey = "b14ca5898a4e4133bbce2ea2315a1916";

            cipherText = cipherText.Replace(" ", "+");

            byte[] cipherBytes = Convert.FromBase64String(cipherText);

            using (Aes encryptor = Aes.Create())

            {

                Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });

                encryptor.Key = pdb.GetBytes(32);

                encryptor.IV = pdb.GetBytes(16);

                using (MemoryStream ms = new MemoryStream())

                {

                    using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))

                    {

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

                        cs.Close();

                    }

                    cipherText = Encoding.Unicode.GetString(ms.ToArray());

                }

            }

            return cipherText;

        }

}

​

​