c# - 读取/解密加密的 XML 文件，然后在内部处理

Question

我过去曾使用此代码编写和读取 xml 文件。这次我想写一些加密生成的 XML，然后读取它并在内部处理它。我会发布代码，也许有人可以发现问题。

当我测试解密时，我能够输出一个包含连续空字符代码行的文件。加密文件似乎包含数据，并且大小随数据量的不同而变化。

请帮忙，谢谢!

加密

MemoryStream ms = new MemoryStream();
XmlTextWriter xmlwriter = new XmlTextWriter(ms,Encoding.UTF8);
FileStream EncryptedFileStream = new FileStream(file, FileMode.Create, FileAccess.Write);

DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
DES.Key = ASCIIEncoding.ASCII.GetBytes("AAAAAAAA");
DES.IV = ASCIIEncoding.ASCII.GetBytes("AAAAAAAA");

ICryptoTransform desEncrypt = DES.CreateEncryptor();
CryptoStream cryptostream = new CryptoStream(EncryptedFileStream, desEncrypt, CryptoStreamMode.Write);

/*create working and tested XML data here*/


byte[] bytearray = new byte[ms.Length];


ms.Read(bytearray, 0, bytearray.Length);
cryptostream.Write(bytearray, 0, bytearray.Length);

cryptostream.Close();

EncryptedFileStream.Close();

xmlwriter.Close();
ms.Flush();
ms.Close();

解密

MemoryStream ms = new MemoryStream();
StreamWriter swDecrypt = new StreamWriter(ms);

DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
DES.Key = ASCIIEncoding.ASCII.GetBytes("AAAAAAAA");
DES.IV = ASCIIEncoding.ASCII.GetBytes("AAAAAAAA");

ICryptoTransform desDecrypt = DES.CreateDecryptor();

FileStream fsDecrypt = new FileStream(mstrIndexFile, FileMode.Open, FileAccess.Read);

CryptoStream cryptostreamDecr = new CryptoStream(fsDecrypt, desDecrypt, CryptoStreamMode.Read);

swDecrypt.Write(new StreamReader(cryptostreamDecr).ReadToEnd());
swDecrypt.Flush();
ms.Position = 0;

Answer 1

使用您当前的体系结构，您需要使用刚刚填充数据的 MemoryStream(不要忘记将其位置重置为零并刷新任何待处理的写入)

//I am currently stuck on this point.
swDecrypt.Flush();
ms.Position=0;
XmlTextReader lxmlReader = new XmlTextReader(ms);

但是，我的感觉是您在这里不需要 MemoryStream。相反，只需将 CryptoStream 提供给 XmlTextReader:

CryptoStream cryptostreamDecr = new CryptoStream(.....
XmlTextReader lxmlReader = new XmlTextReader(cryptostreamDecr);