尝试在写入文件时加密NSDictionary [英] Trying to encrypt an NSDictionary when writing to file

问题描述

我正在保存一个NSDictionary到iOS设备上的文件。然而，NSDictionary文件是可读的XML。我不希望人们能够进入和阅读内容，所以我需要能够在加载文件时加密该文件并再次加载。

我目前正在保存文件：

  NSFileManager * fileManager = [NSFileManager defaultManager]; 
如果（！fileManager）
 {
 NSLog（@无法获取文件管理器保存）; 
 return; 
} 
 
 NSArray * paths = NSSearchPathForDirectoriesInDomains（NSDocumentDirectory，NSUserDomainMask，YES）; 
 NSString * documentsDirectory = [paths objectAtIndex：0]; 
 NSString * filePath = [documentsDirectory stringByAppendingPathComponent：@save.dic]; 
 [m_dictionary writeToFile：filePath atomically：YES]; 
  

我正在加载这样的字典：

  NSArray * paths = NSSearchPathForDirectoriesInDomains（NSDocumentDirectory，NSUserDomainMask，YES）; 
 NSString * documentsDirectory = [paths objectAtIndex：0]; 
 NSString * filePath = [documentsDirectory stringByAppendingPathComponent：@save.dic]; 
 m_dictionary = [[NSMutableDictionary alloc] initWithContentsOfFile：filePath]; 
  

任何人都可以告诉我一个很好的加密方式，加密这个吗？

Cheers，
Rich

解决方案

使用 NSKeyedArchiver 从您的字典创建一个 NSData 对象（ NSKeyedArchiver archivedDataWithRootObject：）。然后使用AES加密NSData ，并将其写入您的文件。 / p>

阅读反过来：首先，读取NSData，通过上述链接的方法对其进行解密，然后将解密后的NSData传递给NSKeyedUnarchiver（ NSKeyedUnarchiver unarchiveObjectWithData：），并且您的字典返回。

I'm currently saving an NSDictionary to file on the iOS device. However, NSDictionary files are readable XML. I don't want people to be able to get in and read the contents so I need to be able to encrypt the file on writing and decrypt when loading it back again.

I'm currently saving the file like this:

NSFileManager* fileManager = [NSFileManager defaultManager];
if (!fileManager)
{
    NSLog(@"Failed to get file manager to save.");
    return;
}

NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString* documentsDirectory = [paths objectAtIndex:0];
NSString* filePath = [documentsDirectory stringByAppendingPathComponent:@"save.dic"];
[m_dictionary writeToFile:filePath atomically:YES];

And I'm loading the dictionary like this:

NSArray*  paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString* documentsDirectory = [paths objectAtIndex:0];
NSString* filePath = [documentsDirectory stringByAppendingPathComponent:@"save.dic"];
m_dictionary = [[NSMutableDictionary alloc] initWithContentsOfFile:filePath];

Can anyone tell me a nice way of encrypting\decrypting this?

Cheers, Rich

解决方案

Use a NSKeyedArchiver to create an NSData object from your dictionary (NSKeyedArchiver archivedDataWithRootObject:). Then encrypt the NSData with AES and write that to your file.

Reading takes the reverse: first, read the NSData, decrypt it via the method from the mentioned link, then pass the decrypted NSData to NSKeyedUnarchiver (NSKeyedUnarchiver unarchiveObjectWithData:) and you get your dictionary back.

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