1  /// 
   2         /// 256位AES加密   3         /// 
   4         ///    5         /// 
       6         public static string Encrypt(string toEncrypt, string skey, string IV) 7         { 8             //256-AES key       9             //byte[] keyArray = UTF8Encoding.UTF8.GetBytes("12345678123456781234567812345678");10             byte[] keyArray = UTF8Encoding.UTF8.GetBytes(skey);11             byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);12             byte[] ivArray = UTF8Encoding.UTF8.GetBytes(IV);//123456781234567813 14             RijndaelManaged rDel = new RijndaelManaged();15             rDel.Key = keyArray;16             rDel.Mode = CipherMode.CBC;17             rDel.Padding = PaddingMode.PKCS7;18             rDel.IV = ivArray;19 20             ICryptoTransform cTransform = rDel.CreateEncryptor();21             byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);22 23             return Convert.ToBase64String(resultArray, 0, resultArray.Length);24         }

/// 
          /// 256位AES解密          /// 
          ///           /// 
               public static string Decrypt(string toDecrypt, string skey, string IV)        {            //256-AES key            //byte[] keyArray = UTF8Encoding.UTF8.GetBytes("12345678123456781234567812345678");            byte[] keyArray = UTF8Encoding.UTF8.GetBytes(skey);            byte[] toDecryptArray = Convert.FromBase64String(toDecrypt);            byte[] ivArray = UTF8Encoding.UTF8.GetBytes(IV); //1234567812345678            RijndaelManaged rDel = new RijndaelManaged();            rDel.Key = keyArray;            rDel.Mode = CipherMode.CBC;            rDel.Padding = PaddingMode.PKCS7;            rDel.IV = ivArray;            ICryptoTransform cTransform = rDel.CreateDecryptor();            byte[] resultArray = cTransform.TransformFinalBlock(toDecryptArray, 0, toDecryptArray.Length);            return UTF8Encoding.UTF8.GetString(resultArray);        }