EncryptionService

.cs

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace Demo
{
    public static class EncryptionService
    {
        private static string EncryptionKey = "some-secret-key-longer-or-equal-to-128-bits";

        public static string Encrypt(string clearText)
        {
            byte[] clearBytes = Encoding.UTF8.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());
                }
            }
            Console.WriteLine(clearText);
            return clearText;
        }
        public static string Decrypt(string cipherText)
        {
            cipherText = cipherText.Replace(" ", "+");
            byte[] cipherBytes = Convert.FromBase64String(cipherText);
            try
            {
                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.UTF8.GetString(ms.ToArray());
                    }
                }
                return cipherText;
            }
            catch (Exception)
            {
                return "Could not decrypt";
                throw;
            }
        }
    }

}