如何使用 C# 验证文件是否是受密码保护的 ZIP 文件

发布于 2024-08-09 04:13:01 字数 192 浏览 2 评论 0原文

给定文件路径，如何验证该文件是否是受密码保护的 zip 文件？

即，我将如何实现这个功能？

bool IsPasswordProtectedZipFile(string pathToFile)

我不需要解压缩该文件——我只需要验证它是否是 ZIP 且已受密码保护。

谢谢

原文

Given a path to a file, how can I validate that the file is a password-protected zip file?

i.e., how would I implement this function?

bool IsPasswordProtectedZipFile(string pathToFile)

I don't need to unzip the file -- I just need to verify that it's a ZIP and has been protected with some password.

Thanks

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情场扛把子 2024-08-16 04:13:01

使用 SharpZipLib，以下代码有效。我所说的作品是指 entry.IsCrypted 根据 zip 文件中第一个条目是否有密码返回 true 或 false。

var file = @"c:\testfile.zip";
FileStream fileStreamIn = new FileStream(file, FileMode.Open, FileAccess.Read);
ZipInputStream zipInStream = new ZipInputStream(fileStreamIn);
ZipEntry entry = zipInStream.GetNextEntry();
Console.WriteLine("IsCrypted: " + entry.IsCrypted);

CodeProject 上有一个关于使用 SharpZipLib 的简单教程。

因此，一个简单的实现看起来像这样：

public static bool IsPasswordProtectedZipFile(string path)
{
    using (FileStream fileStreamIn = new FileStream(path, FileMode.Open, FileAccess.Read))
    using (ZipInputStream zipInStream = new ZipInputStream(fileStreamIn))
    {
        ZipEntry entry = zipInStream.GetNextEntry();
        return entry.IsCrypted;
    }
}

注意，没有真正的错误处理或任何东西......

Using SharpZipLib, the following code works. And by works I mean entry.IsCrypted returns true or false based on whether or not there is a password for the first entry in the zip file.

var file = @"c:\testfile.zip";
FileStream fileStreamIn = new FileStream(file, FileMode.Open, FileAccess.Read);
ZipInputStream zipInStream = new ZipInputStream(fileStreamIn);
ZipEntry entry = zipInStream.GetNextEntry();
Console.WriteLine("IsCrypted: " + entry.IsCrypted);

There's a simple tutorial on using SharpZipLib on CodeProject.

Thus a simple implementation looks something like:

public static bool IsPasswordProtectedZipFile(string path)
{
    using (FileStream fileStreamIn = new FileStream(path, FileMode.Open, FileAccess.Read))
    using (ZipInputStream zipInStream = new ZipInputStream(fileStreamIn))
    {
        ZipEntry entry = zipInStream.GetNextEntry();
        return entry.IsCrypted;
    }
}

Note there's no real error handling or anything...

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情何以堪。 2024-08-16 04:13:01

在 ZIP 存档中，密码不是放在文件上，而是放在文件中的各个条目上。 zip 可能包含一些加密的条目，一些则未加密。下面是一些用于检查 DotNetZip 中条目加密情况的示例代码：

int encryptedEntries = 0;
using (var zip = ZipFile.Read(nameOfZipFile)) 
{
    // check a specific, named entry: 
    if (zip["nameOfEntry.doc"].UsesEncryption)
       Console.WriteLine("Entry 'nameOfEntry.doc' uses encryption"); 

    // check all entries: 
    foreach (var e in zip)
    {
       if (e.UsesEncryption)
       {
           Console.WriteLine("Entry {0} uses encryption", e.FileName); 
           encryptedEntries++; 
       }
    }
}

if (encryptedEntries > 0) 
    Console.WriteLine("That zip file uses encryption on {0} entrie(s)", encryptedEntries);

如果您愿意，可以使用 LINQ：

private bool ZipUsesEncryption(string archiveToRead)
{
    using (var zip = ZipFile.Read(archiveToRead))
    {
        var selection = from e in zip.Entries
            where e.UsesEncryption
            select e;

        return selection.Count > 0;
    }
}

In ZIP archives, the password is not placed on the file, but on the individual entries within the file. A zip can contain some entries encrypted and some not. Here's some example code to check for encryption on entries in DotNetZip:

int encryptedEntries = 0;
using (var zip = ZipFile.Read(nameOfZipFile)) 
{
    // check a specific, named entry: 
    if (zip["nameOfEntry.doc"].UsesEncryption)
       Console.WriteLine("Entry 'nameOfEntry.doc' uses encryption"); 

    // check all entries: 
    foreach (var e in zip)
    {
       if (e.UsesEncryption)
       {
           Console.WriteLine("Entry {0} uses encryption", e.FileName); 
           encryptedEntries++; 
       }
    }
}

if (encryptedEntries > 0) 
    Console.WriteLine("That zip file uses encryption on {0} entrie(s)", encryptedEntries);

If you'd prefer, you can use LINQ:

private bool ZipUsesEncryption(string archiveToRead)
{
    using (var zip = ZipFile.Read(archiveToRead))
    {
        var selection = from e in zip.Entries
            where e.UsesEncryption
            select e;

        return selection.Count > 0;
    }
}

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