加密/解密.plist文件ios

时间:2012-12-12 15:51:29

标签: ios encryption plist

我有一个带有一些存储数据的plist并且想加密解密因此使用目标c无法读取。我已经读过关于AES加密等但我想要整个plist加密一些如何不是plist中的字符串....

任何帮助都会非常感激。

3 个答案:

答案 0 :(得分:4)

使用http://blog.objectgraph.com/index.php/2010/04/20/encrypting-decrypting-base64-encode-decode-in-iphone-objective-c/处的代码(您在评论中提供的链接),您可以通过以下方式加密您的plist:

NSData *plistFileData = [NSData dataWithContentsOfFile:plistPath];
NSData *encryptedData = [plistFileData AESEncryptWithPassphrase:password];
[encryptedData writeToFile:encryptedPath atomically:YES];

plistPath 是一个NSString,包含要加密的plist文件的路径
密码是您要使用的加密密钥 encryptedPath 是您要保存加密文件的地方

解密:

NSData *encryptedData = [NSData dataWithContentsOfFile:encryptedPath];
NSData *plistFileData = [plistFileData AESDecryptWithPassphrase:password];
[plistFileData writeToFile:plistPath atomically:YES];

encryptedPath 是一个NSString,包含加密plist文件的路径
密码是您要使用的加密密钥 plistPath 是您要保存解密的plist文件的地方

答案 1 :(得分:3)

这是一个非常简单的答案,希望这可以简化问题,如果有的话;

首先需要下载here的NSData + AES文件。你只需要NSData + AES.h& NSData + AES.m以及cipher.h& cipher.m文件。一旦保管,将文件添加到Xcode项目并删除#import Cocoa / Cocoa.h>来自NSData + AES.h和cipher.h的标题(仅适用于打算为iOS编程的用户,如果是MacOS,请让标题为)。在您获取和编写plist文件的文件中导入NSData + AES.h。

既然已经确定了最初的基础知识,我们就会使用这些重要的文件。您需要了解的是您希望解密和加密数据的方式。在第一次运行时,您需要将plist复制到文档文件夹,然后加密它。注意,如果你复制它并尝试直接解密它将抛出异常,所以为了满足这一点,我们将使用UserDefaults布尔值并在第一次运行时跳过解密。您还需要定义预处理程序指令常量字符串以接受加密和解密的密钥。这是您在DataHandler类中的内容;

    #import <Foundation/Foundation.h>
    #import "NSData+AES.h"
    #define MY_SECRET_KEY   @"MY_SECRET_KEY"

    static NSMutableDictionary *dataDictionary_ = nil;
    static NSMutableDictionary *allSettings_ = nil;

    @implementation DataHandler

    - (id)init
    {
        if(self = [super init])
        {
            [self copyPlistData];
        }
        return self;
    }
    // Encrypt File
    - (NSData*)encryptFile:(NSMutableDictionary *)plistDict
    {
        NSError *err = nil;
        NSData *data = [NSPropertyListSerialization dataWithPropertyList:plistDict format:NSPropertyListXMLFormat_v1_0 options:0 error:&err];
        NSData *file = [data encryptWithString:MY_SECRET_KEY];

        return file;
    }

    // Decrypt File
    - (NSMutableDictionary *)decryptFile:(NSData *)data
    {
        NSError *err = nil;
        NSData* newData = [data decryptWithString:MY_SECRET_KEY];
        NSPropertyListFormat format;
        NSMutableDictionary *file = [NSPropertyListSerialization propertyListWithData:newData options:NSPropertyListMutableContainersAndLeaves format:&format error:&err];

        return file;
    }

    - (void) copyPlistData
    {
        NSError *error;
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsDirectory =  [paths objectAtIndex:0];
        NSString *path = [documentsDirectory stringByAppendingPathComponent: @"myData.plist"];
        NSFileManager *fileManager = [NSFileManager defaultManager];
        BOOL fileExists = [fileManager fileExistsAtPath:path];

        //check if the file exists already in users documents folder
        //if file does not exist copy it from the APPLICATION bundle Plist file
        if (!fileExists)
        {
            NSLog(@"copying database to users documents");
            NSString *pathToSettingsInBundle = [[NSBundle mainBundle] pathForResource:@"mydata" ofType:@"plist"];
            BOOL copySuccess = [fileManager copyItemAtPath:pathToSettingsInBundle toPath:path error:&error];
            if(copySuccess)
            {
                noCopyError_ = YES;
            }
        }
        //if file is already there do nothing
        else
        {
            noCopyError_ = YES;
            NSLog(@"users database already configured");
        }

        BOOL firstRun = [[NSUserDefaults standardUserDefaults] boolForKey:@"IS_FIRST_RUN"];
        if(noCopyError_ && firstRun)
        {
             dataDictionary_ = [self decryptFile:[NSData dataWithContentsOfFile:path]];
        }
        else
        {
             [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"IS_FIRST_RUN"];
             [[NSUserDefaults standardUserDefaults] synchronize];

             NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
             NSString *documentsDirectory = [paths objectAtIndex:0];
             NSString *plistPath = [documentsDirectory stringByAppendingPathComponent:@"mydata.plist"];
             dataDictionary_ = (NSMutableDictionary*)[[NSDictionary alloc ] initWithContentsOfFile:plistPath];
             NSMutableDictionary *data = (NSMutableDictionary*)[dictionaryDATA_ objectForKey:@"Data"];

             allSettings_ = [data objectForKey:@"AllSettings"];
        }
    }

    - (NSMutableDictionary*) properties
    {
        NSMutableDictionary * props = [[NSMutableDictionary alloc]init];
        [props setObject: allSettings_ forKey:@"AllSettings"];

        NSMutableDictionary * data = [NSMutableDictionary dictionaryWithObject:props forKey:@"Data"];
        return data;
    }

    - (void)persistData
    {
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsDirectory =  [paths objectAtIndex:0];
        NSString *plistPath = [documentsDirectory stringByAppendingPathComponent:@"mydata.plist"];

        NSMutableDictionary *dict = [self properties];
        NSData *encryptedDict = [self encryptFile:dict];
        [encryptedDict writeToFile:plistPath atomically:YES];
    }

但是第一次填充dataDictionary_时,我们必须在didFinishLaunching中强制将它保存在AppDelegate.m中:

    DataHandler *dataHandler = [[DataHandler alloc] init];
    [dataHandler persistData];

数据将始终加密,但在copyPlist方法中,您将根据dataDictionary_填充模型并与这些模型进行交互。完成后,您将保留模型并再次加密,因此不会发生错误。这很简单,是一个非常可行的解决方案,没有任何麻烦。欢呼声。

答案 2 :(得分:2)

howanghk提供的链接包含带有错误的代码。在该网页上应用InoriXu提供的修复程序来解决问题。您必须修改加密和解密函数。

所以在一行之后:

const char *password = [pass UTF8String];

添加:

const int passwordLen = [pass length];

改变行:

key[i] = password != 0 ? *password++ : 0;

成:

key[i] = i < passwordLen != 0 ? *password++ : 0;

代码本身仍会添加一些空格填充,但如果你需要它来加密属性列表,你会没事的。