C# AES加密算法

using System;   
using System.Security.Cryptography;   
using System.Text;   
using System.IO;   
  
namespace GraduationDesign   
{       
    class AESEncryption    
    {           
        //默认密钥向量    
        private static byte[] _key1 = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF, 0x12, 0x34, 0x56,  0x78, 0x90, 0xAB, 0xCD, 0xEF };    
  
        /// <summary>   
        /// AES加密算法   
        /// </summary>   
        /// <param name="plainText">明文字符串</param>   
        /// <param name="strKey">密钥</param>   
        /// <returns>返回加密后的密文字节数组</returns>   
        public static byte[] AESEncrypt(string plainText , string strKey )   
        {   
            //分组加密算法   
            SymmetricAlgorithm des = Rijndael .Create () ;                 
            byte[] inputByteArray =Encoding .UTF8  .GetBytes (plainText ) ;//得到需要加密的字节数组       
                            //设置密钥及密钥向量   
            des.Key =Encoding.UTF8.GetBytes (strKey );   
            des.IV = _key1 ;               
            MemoryStream ms = new MemoryStream();   
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);   
            cs.Write(inputByteArray, 0, inputByteArray.Length);   
            cs.FlushFinalBlock();