/// <summary> /// ASE加解密 /// </summary> public class AESHelper {     /// <summary>     /// 获取密钥     /// </summary>     private static string Key     {         get         {             return "abcdef1234567890";    ////必须是16位         }     }     //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>     /// <returns>将加密后的密文转换为Base64编码，以便显示</returns>     public static string AESEncrypt(string plainText)     {         //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(Key);         des.IV = _key1;         byte[] cipherBytes = null;         using (MemoryStream ms = new MemoryStream())         {             using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))             {                 cs.Write(inputByteArray, 0, inputByteArray.Length);                 cs.FlushFinalBlock();                 cipherBytes = ms.ToArray();//得到加密后的字节数组                 cs.Close();                 ms.Close();             }         }         return Convert.ToBase64String(cipherBytes);     }     /// <summary>     /// AES解密     /// </summary>     /// <param name="cipherText">密文字符串</param>     /// <returns>返回解密后的明文字符串</returns>     public static string AESDecrypt(string showText)     {         byte[] cipherText = Convert.FromBase64String(showText);         SymmetricAlgorithm des = Rijndael.Create();         des.Key = Encoding.UTF8.GetBytes(Key);         des.IV = _key1;         byte[] decryptBytes = new byte[cipherText.Length];         using (MemoryStream ms = new MemoryStream(cipherText))         {             using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Read))             {                 cs.Read(decryptBytes, 0, decryptBytes.Length);                 cs.Close();                 ms.Close();             }         }         return Encoding.UTF8.GetString(decryptBytes).Replace("\0", "");   ///将字符串后尾的'\0'去掉     } }