如何创建下载的文本文件的SHA256散列

问题描述：

我有一个项目，可以将URL传到一个文件（例如www.documents.com/docName.txt），我想为该文件创建一个散列。我怎么做到这一点。

I have a project where I get the url to a file (e.g. www.documents.com/docName.txt) and I want to create a hash for that file. How can I do this.

FileStream filestream;
SHA256 mySHA256 = SHA256Managed.Create();

filestream = new FileStream(docUrl, FileMode.Open);

filestream.Position = 0;

byte[] hashValue = mySHA256.ComputeHash(filestream);

Label2.Text = BitConverter.ToString(hashValue).Replace("-", String.Empty);

filestream.Close();

这是我必须创建散列的代码。但看到它如何使用文件流它使用存储在硬盘驱动器上的文件（例如c：/documents/docName.txt）但我需要它使用URL到文件而不是驱动器上文件的路径。 p>

This is the code i have to create a hash. But seeing how it uses filestream it uses files stored on the hard drive (e.g. c:/documents/docName.txt) But i need it to work with an url to a file and not the path to a file on the drive.

答

要下载文件，请使用：

To download the file use:

string url = "http://www.documents.com/docName.txt";
string localPath = @"C://Local//docName.txt"

using (WebClient client = new WebClient())
{
    client.DownloadFile(url, localPath);
}

然后阅读您喜欢的文件：

then read the file like you have:

FileStream filestream;
SHA256 mySHA256 = SHA256Managed.Create();

filestream = new FileStream(localPath, FileMode.Open);

filestream.Position = 0;

byte[] hashValue = mySHA256.ComputeHash(filestream);

Label2.Text = BitConverter.ToString(hashValue).Replace("-", String.Empty);

filestream.Close();

如何创建下载的文本文件的SHA256散列

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