using System;

using System.Collections.Generic;

//using System.Text;

// Need to add a Reference to the System.Web assembly.

using System.Web;

using System.Text.RegularExpressions;

using System.Globalization;

using System.Linq;

using System.Text.RegularExpressions;

using System.Text;

using System.Security.Cryptography;

using System.IO;

using Microsoft.IdentityModel.Tokens;

​

namespace UriEncodingDEMO2

{

    public class Program

    {

        private static readonly byte[] key = Encoding.UTF8.GetBytes("0001028304051996");

        private static readonly byte[] iv = Encoding.UTF8.GetBytes("1011121394152507");

        public static void Main(string[] args)

        {

            var encryptPlainText = "11111275:ppp";          

            var encryptText = Encrypt(encryptPlainText);

            var encryptPlainTextBytes = Encoding.UTF8.GetBytes(encryptText);

            var base64Encrypt = Convert.ToBase64String(encryptPlainTextBytes);

            Console.WriteLine(base64Encrypt);

        }

        public static string Encrypt(string plainText)

        {

            return Convert.ToBase64String(EncryptStringToBytes(plainText));

        }

​

        private static byte[] EncryptStringToBytes(string plainText)

        {

            // 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("key");

            }

            byte[] encrypted;

            // Create a RijndaelManaged object

            // with the specified key and IV.

            using (var rijAlg = new RijndaelManaged())

            {

                rijAlg.Mode = CipherMode.CBC;

                rijAlg.Padding = PaddingMode.PKCS7;

                rijAlg.FeedbackSize = 128;

​

                rijAlg.Key = key;

                rijAlg.IV = iv;

​

                // Create a decrytor to perform the stream transform.

                var encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);

​

                // Create the streams used for encryption.

                using (var msEncrypt = new MemoryStream())

                {

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

                    {

                        using (var 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;

        }

    }

}