using System;

using System.IO;

using System.Security.Cryptography;

​

public class Program

{

    public static void Main()

        {

            string original = "Here is some data to encrypt!";

​

            // Create a new instance of the Aes

            // class.  This generates a new key and initialization

            // vector (IV).

            using (Aes myAes = Aes.Create())

            {

​

                // Encrypt the string to an array of bytes.

                byte[] encrypted = EncryptStringToBytes_Aes(original, myAes.Key, myAes.IV);

                byte[] copia= null;

                // Decrypt the bytes to a string.

                string roundtrip = DecryptStringFromBytes_Aes(encrypted, myAes.Key, myAes.IV);

​

                //Display the original data and the decrypted data.

                Console.WriteLine("Original:   {0}", original);

                foreach (byte i in encrypted)

                {

                    System.Console.Write("{0} ", i);

                    copia.SetValue("{0} ",i);

                }

                foreach (byte i in copia)

                {

                    System.Console.Write("{0} ", i);

                    copia.SetValue("{0} ",i);

                }

                Console.WriteLine(encrypted.GetValue(1));

                Console.WriteLine("Round Trip: {0}", roundtrip);

            }

        }

        static byte[] EncryptStringToBytes_Aes(string plainText, byte[] Key, byte[] IV)

        {

            // Check arguments.

            if (plainText == null || plainText.Length <= 0)

                throw new ArgumentNullException("plainText");

            if (Key == null || Key.Length <= 0)

                throw new ArgumentNullException("Key");

            if (IV == null || IV.Length <= 0)

                throw new ArgumentNullException("IV");

            byte[] encrypted;

​

            // Create an Aes object

            // with the specified key and IV.

            using (Aes aesAlg = Aes.Create())

            {

                aesAlg.Key = Key;

                aesAlg.IV = IV;

​

                // Create an encryptor to perform the stream transform.

                ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);

​

                // Create the streams used for encryption.

                using (MemoryStream msEncrypt = new MemoryStream())

                {

                    using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))

                    {

                        using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))

                        {

                            //Write all data to the stream.

                            swEncrypt.Write(plainText);

                        }

                        encrypted = msEncrypt.ToArray();

                    }

                }

            }

​

            // Return the encrypted bytes from the memory stream.

            return encrypted;

        }

​

        static string DecryptStringFromBytes_Aes(byte[] cipherText, byte[] Key, byte[] IV)

        {

            // Check arguments.

            if (cipherText == null || cipherText.Length <= 0)

                throw new ArgumentNullException("cipherText");

            if (Key == null || Key.Length <= 0)

                throw new ArgumentNullException("Key");

            if (IV == null || IV.Length <= 0)

                throw new ArgumentNullException("IV");

​

            // Declare the string used to hold

            // the decrypted text.

            string plaintext = null;

​

            // Create an Aes object

            // with the specified key and IV.

            using (Aes aesAlg = Aes.Create())

            {

                aesAlg.Key = Key;

                aesAlg.IV = IV;

​

                // Create a decryptor to perform the stream transform.

                ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);

​

                // Create the streams used for decryption.

                using (MemoryStream msDecrypt = new MemoryStream(cipherText))

                {

                    using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))

                    {

                        using (StreamReader srDecrypt = new StreamReader(csDecrypt))

                        {

​

                            // Read the decrypted bytes from the decrypting stream

                            // and place them in a string.

                            plaintext = srDecrypt.ReadToEnd();

                        }

                    }

                }

            }

​

            return plaintext;

        }

}