DES数据解密

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/// <summary> /// DES数据解密 /// </summary> /// <param name="targetValue"></param> /// <param name="key"></param> /// <returns></returns> public static string Decrypt(string targetValue, string key = "test") {     if (string.IsNullOrEmpty(targetValue))     {         return string.Empty;     }     // 定义DES加密对象     try     {         var des = new DESCryptoServiceProvider();         int len = targetValue.Length / 2;         var inputByteArray = new byte[len];         int x, i;         for (x = 0; x < len; x++)         {             i = Convert.ToInt32(targetValue.Substring(x * 2, 2), 16);             inputByteArray[x] = (byte)i;         }         // 通过两次哈希密码设置对称算法的初始化向量           des.Key = Encoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile                                               (FormsAuthentication.HashPasswordForStoringInConfigFile(key, "md5").                                                    Substring(0, 8), "sha1").Substring(0, 8));         // 通过两次哈希密码设置算法的机密密钥           des.IV = Encoding.ASCII.GetBytes(FormsAuthentication.HashPasswordForStoringInConfigFile                                              (FormsAuthentication.HashPasswordForStoringInConfigFile(key, "md5")                                                   .Substring(0, 8), "md5").Substring(0, 8));         // 定义内存流         var ms = new MemoryStream();         // 定义加密流         var cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);         cs.Write(inputByteArray, 0, inputByteArray.Length);         cs.FlushFinalBlock();         return Encoding.Default.GetString(ms.ToArray());     }     catch     {     }     return string.Empty; }