Question

我有一个使用RijndaelManaged Cipher的DecryptString函数。它的工作时间为99.999％，但它非常具有“IndexOutOfRangeException”异常，并显示“Index超出数组边界”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，然后开始再次工作，没有明显的探索。我所拥有的一个领先是它只是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();
            }
        }

Answer 1

我注意到的一件事是你在关闭finally块中的cryptoStream本身之前关闭了cryptoStream的底层流 - 也许你应该反转这两个语句？

CryptoStream实例关闭时抛出异常

1 个答案: