TripleDES

3DES encrypt-decrypt.cs

class Program
    {
        static void Main(string[] args)
        {
            string mainkey = "ghRag3Svho6nMYBbyCnEJc4wVRTkGX82";

            string result = Encrypt("EncryptMe", mainkey);

            Console.WriteLine(result);
            Console.ReadKey();
            result = Decrypt(result, mainkey); 

            Console.WriteLine(result);
            Console.ReadKey();
        }

        static string Encrypt(string data, string key)
        {
            MemoryStream ms = new MemoryStream();
            byte[] keyb = Convert.FromBase64String(key);
            TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
            CryptoStream encStream = new CryptoStream(ms, tdes.CreateEncryptor(keyb, tdes.IV), CryptoStreamMode.Write);
            StreamWriter sw = new StreamWriter(encStream);
            sw.Write(data);
            sw.Flush();
            encStream.FlushFinalBlock();
            ms.Seek(0, SeekOrigin.Begin);
            string encText = Convert.ToBase64String(ms.ToArray());
            string ivs = Convert.ToBase64String(tdes.IV);
            string EncryptedData = ivs + ":" + encText;

            return EncryptedData;
        }

        static string Decrypt(string EncryptedData, string Key)
        {
            string Data = string.Empty;

            string[] parts = EncryptedData.Split(':');
            if ((parts.Length != 2))
            {
                throw new ApplicationException("Invalid data");
            }

            byte[] iv = Convert.FromBase64String(parts[0]);
            byte[] datab = Convert.FromBase64String(parts[1]);
            byte[] keyb = Convert.FromBase64String(Key);
            TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
            
            MemoryStream ms = new MemoryStream(datab);
            CryptoStream encStream = new CryptoStream(ms, tdes.CreateDecryptor(keyb, iv), CryptoStreamMode.Read);
            using (StreamReader sr = new StreamReader(encStream))
            {
                Data = sr.ReadToEnd();
            }

            return Data;
        }
    }