如何使用 NSFileManager 保护或加密视频文件？

Question

我需要保护 iOS 上文档目录或（库目录）中的文件，尤其是视频。我不希望用户可以通过 Xcode 或 iExplorer 应用程序下载文档目录中的视频。我需要保护库目录中的私有内容（或）如何在从服务器下载后加密视频文件。请帮我解决这个问题。

NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@.mp4",videoUrlName]]];
NSString* path = [NSString stringWithFormat:@"%@.mp4",videoName];
AFDownloadRequestOperation *videoDownloadRequest = [[AFDownloadRequestOperation alloc] initWithRequest:request targetPath:path shouldResume:YES];

[videoDownloadRequest setProgressiveDownloadProgressBlock:^(AFDownloadRequestOperation *operation, NSInteger bytesRead, long long totalBytesRead, long long totalBytesExpected, long long totalBytesReadForFile, long long totalBytesExpectedToReadForFile)
 {
     float progress = totalBytesReadForFile / (float)totalBytesExpectedToReadForFile;
     NSString *progressMessage = [NSString stringWithFormat:@"%@%@ / %@", @"Downloading...", [self fileSizeStringWithSize:totalBytesReadForFile], [self fileSizeStringWithSize:totalBytesExpectedToReadForFile]];
 }];

[videoDownloadRequest setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject)
 {
     UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Message" message:[NSString stringWithFormat:@"%@ has been added to your Playlist",detailCellView.titleLabel.text] delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
     [alertView show];
 }
                                            failure:^(AFHTTPRequestOperation *operation, NSError *error)
 {


 }];
[[NSOperationQueue mainQueue] addOperation:videoDownloadRequest];

Answer 1

您可以使用任何加密算法来加密您的数据。 AES256 是最常用的算法之一。

您可以使用这个使用 AES 的优秀包装器 https://github.com/RNCryptor/RNCryptor

用法也非常简单。

[videoDownloadRequest setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject)
 {
    NSData *data = [[NSFileManager defaultManager] contentsAtPath:path];
    NSString *password = @"Secret password";
    NSData *ciphertext = [RNCryptor encryptData:data password:password];

   [data writeToFile:path atomically:YES];
 }

但请记住，真正的安全取决于您保存密钥的安全程度（即上述情况下的 Secret 密码）

Answer 2

Apple 已阻止从 App Store 下载的应用访问大部分 Apps 目录 Refer this

我们需要在应用提交之前做一件事

https://developer.apple.com/library/ios/qa/qa1719/_index.html

如何使用 NSFileManager 保护或加密视频文件？

How to secure or encrypt video files with NSFileManager?

ios

objective-c

iphone

ios7

ios8