C # basic-MD5 validation

First, preface

MD5 authentication is mainly used to update the file features, the server tells the client to download which update files and provide the client with its MD5 value, the client downloads the update file from the server to the local and calculates the MD5 value of the downloaded file, and the locally received MD5 value is compared to the MD5 value provided by the server. If the same is true, the downloaded file is consistent with the file provided by the server, and if not, the file may be missing after the download and should be discarded or resumed on a breakpoint.

Second, calculate the MD5 value of the file

usingSystem.Security.Cryptography;usingSystem.Text;using(FileStream file =NewFileStream (FilePath, System.IO.FileMode.Open)) {MD5 MD5=NewMD5CryptoServiceProvider (); byte[] Yourfile =Md5.computehash (file); File.       Close (); StringBuilder FileMD5=NewStringBuilder ();  for(inti =0; i < yourfile.length; i++) {filemd5.append (Yourfile[i]. ToString ("X2")); } filemd5.tostring ();}

C # basic-MD5 validation