当CryptoStream实例关闭时抛出异常

我有一个使用RijndaelManaged密码的DecryptString函数。它的工作时间为99.999％，但非常偶然，它会抛出“IndexOutOfRangeException”异常，并显示消息“索引超出了数组边界”。当它试图关闭finally块中的cryptoStream时。当CryptoStream实例关闭时抛出异常

当它停止工作时，它会停止工作20分钟左右，然后开始再次工作，但不明显的爆炸。其中铅我有是，它只有ST

public string DecryptString(string InputText, string Password) 
     { 
      //checkParamSupplied("InputText", InputText); 
      checkParamSupplied("Password", Password); 

      MemoryStream memoryStream = null; 
      CryptoStream cryptoStream = null; 

      try 
      { 
       RijndaelManaged RijndaelCipher = new RijndaelManaged(); 

       byte[] EncryptedData = Convert.FromBase64String(InputText); 

       byte[] Salt = Encoding.ASCII.GetBytes(Password.Length.ToString()); 

       PasswordDeriveBytes SecretKey = new PasswordDeriveBytes(Password, Salt); 

       // Create a decryptor from the existing SecretKey bytes. 
       ICryptoTransform Decryptor = RijndaelCipher.CreateDecryptor(SecretKey.GetBytes(32), SecretKey.GetBytes(16)); 

       memoryStream = new MemoryStream(EncryptedData); 

       // Create a CryptoStream. (always use Read mode for decryption). 
       cryptoStream = new CryptoStream(memoryStream, Decryptor, CryptoStreamMode.Read); 

       // Since at this point we don't know what the size of decrypted data 
       // will be, allocate the buffer long enough to hold EncryptedData; 
       // DecryptedData is never longer than EncryptedData. 
       byte[] PlainText = new byte[EncryptedData.Length]; 

       // Start decrypting. 
       int DecryptedCount = cryptoStream.Read(PlainText, 0, PlainText.Length); 

       // Convert decrypted data into a string. 
       string DecryptedData = Encoding.Unicode.GetString(PlainText, 0, DecryptedCount); 

       // Return decrypted string. 
       return DecryptedData; 
      } 
      catch (Exception ex) 
      { 
       throw; 
      } 
      finally 
      { 
       //Close both streams. 
       memoryStream.Close(); 
       cryptoStream.Close(); 
      } 
     }

来源

2012-01-12 Jonathan Stanton

乔纳森 - 你的问题是不完整的... – 2012-01-12 10:09:27

文本和代码似乎都被切断了... – 2012-01-12 10:12:36

感谢你的，我的浏览器正在玩。我已经添加了其余的代码。 – 2012-01-12 10:23:02

有一两件事我注意到的是，您要关闭的CryptoStream的底层流在关闭的CryptoStream本身之前在finally块 - 也许你应该扭转这两个语句？

来源

2012-01-12 10:24:13

。用块嵌套（嵌套）也可以防止这种混淆和错误。 – 2012-01-12 10:45:57

当CryptoStream实例关闭时抛出异常

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