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我有一个使用 RijndaelManaged Cipher 的 DecryptString 函数。它在 99.999% 的时间都可以工作，但偶尔会引发“IndexOutOfRangeException”异常，并显示“索引超出数组范围”的消息。当它试图关闭 finally 块中的 cryptoStream 时。

当它停止工作时，它将停止工作20分钟左右，然后重新开始工作，没有明显的解释。我确实有一个线索是它只是

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();
            }
        }
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1 回答 1

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我确实注意到的一件事是，您在关闭finally块中的 cryptoStream 本身之前关闭了 cryptoStream 的底层流 - 也许您应该颠倒这两个语句？

于 2012-01-12T10:24:13.387 回答