如何从HttpPostedFileBase文件中获得SHA1和MD5校验和
本文关键字:SHA1 MD5 校验和 HttpPostedFileBase 文件 | 更新日期: 2023-09-27 18:01:38
我想在MVC中获得上传文件的校验和。
当前我正在做这个
public ActionResult Index(HttpPostedFileBase file, string path)
{
if (file != null)
{
string checksumMd5 = HashGenerator.GetChecksum(file.InputStream, HashGenerator.MD5);;
string checksumSha1 = HashGenerator.GetChecksum(file.InputStream, HashGenerator.SHA1);
//other logic follows....
}
但是当我在控制台应用程序中执行并从文件路径读取文件时,
string path = @"C:'Users'anandv4'Desktop'Manifest-5977-681-673.txt";
var md5hash = HashGenerator.GetChecksum(path, HashGenerator.MD5);
var sha1 = HashGenerator.GetChecksum(path, HashGenerator.SHA1);
两者的值不同
生成哈希的代码:
public static string GetChecksum(string fileName, HashAlgorithm algorithm)
{
using (var stream = new BufferedStream(File.OpenRead(fileName), 1000000))
{
return BitConverter.ToString(algorithm.ComputeHash(stream)).Replace("-", string.Empty);
}
}
public static string GetChecksum(Stream stream, HashAlgorithm algorithm)
{
using (stream)
{
return BitConverter.ToString(algorithm.ComputeHash(stream)).Replace("-", string.Empty);
}
}
谁能告诉我这两者的区别是什么?最终,这两个方法都解析为GetChecksum方法
如果要对流进行散列,需要在计算散列之前将流的当前位置设置为0。
file.InputStream.Seek(0, SeekOrigin.Begin);
对我来说,这是一个扩展方法的好地方,例如:
//compute hash using extension method:
string checksumMd5 = file.InputStream.GetMD5hash();
被类支持:
using System;
using System.IO;
public static class Extension_Methods
{
public static string GetMD5hash(this Stream stream)
{
stream.Seek(0, SeekOrigin.Begin);
using (var md5Instance = System.Security.Cryptography.MD5.Create())
{
var hashResult = md5Instance.ComputeHash(stream);
stream.Seek(0, SeekOrigin.Begin);
return BitConverter.ToString(hashResult).Replace("-", "").ToLowerInvariant();
}
}
}