In 91

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

namespace Core.Utility
{
    public class Encrypt
    {
        private static string superKey = "your key";
        private static string vectoryString = "your vector string";
        private static RijndaelManaged rijndael = new RijndaelManaged();
        private static byte[] key;
        private static byte[] iv;

        private static void InitialKeyAndIV()
        {
            key = new byte[32];
            Array.Copy(Encoding.UTF8.GetBytes(superKey), key, 32);
            iv = new byte[16];
            Array.Copy(Encoding.UTF8.GetBytes(vectoryString), key, 16);
        }

        public static string EncryptInforamtion(string dataString)
        {
            UTF32Encoding utf32Encoding = new UTF32Encoding();

            if (key == null || iv == null)
            {
                InitialKeyAndIV();
            }

            Byte[] returnVal = AESEncrypt(utf32Encoding.GetBytes(dataString), rijndael.CreateEncryptor(key, iv));
            return Convert.ToBase64String(returnVal);
        }

        public static string DecryptInformation(string dataString)
        {
            UTF32Encoding utf32Encoding = new UTF32Encoding();

            if (key == null || iv == null)
            {
                InitialKeyAndIV();
            }

            Byte[] returnVal = AESDencrypt(Convert.FromBase64String(dataString), rijndael.CreateDecryptor(key, iv));

            //因為加解密會對byte[]做填充，所以解完密後要去掉。
            return utf32Encoding.GetString(returnVal).Replace("\0", "");
        }

        /// <summary>
        /// AES 加密
        /// </summary>
        /// <param name="input"></param>
        /// <param name="encryptor"></param>
        /// <returns></returns>
        private static byte[] AESEncrypt(byte[] input, ICryptoTransform encryptor)
        {
            //Encrypt the data.
            MemoryStream msEncrypt = new MemoryStream();
            CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write);

            //Write all data to the crypto stream and flush it.
            csEncrypt.Write(input, 0, input.Length);
            csEncrypt.FlushFinalBlock();

            //Get encrypted array of bytes.
            return msEncrypt.ToArray();
        }

        /// <summary>
        /// AES 解密
        /// </summary>
        /// <param name="input"></param>
        /// <param name="decryptor"></param>
        /// <returns></returns>
        private static byte[] AESDencrypt(byte[] input, ICryptoTransform decryptor)
        {
            //Now decrypt the previously encrypted message using the decryptor
            // obtained in the above step.
            MemoryStream msDecrypt = new MemoryStream(input);
            CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read);

            byte[] fromEncrypt = new byte[input.Length];

            //Read the data out of the crypto stream.
            csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length);


            return fromEncrypt;
        }
    }
}