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说明

    CAID(China Anonymization ID)是使用iOS系统非隐私参数,用一套统一规则生成的用于匿名化标识苹 果设备的ID。
    在iOS生态中,开发者遵守统一生成规则对同一设备生成的ID相同,开发者之间通过CAID交互即可实现 同一设备的识别,用于满足各业务场景中设备标识的需要。    
    CAID的生成,不采集隐私数据,仅传输加密后的结果,且加密结果不可逆,可有效保护终端用户的隐私 和数据安全。
    因为CAID不依赖于苹果IDFA,能独立于IDFA生成设备标识ID,可作为 iOS14 中设备标识的替代方案, 以及iOS14 以下获取不到IDFA时的补充方案,来提升获取设备ID的成功率。
    本文档将介绍如果获取CAID生成所需的参数,及CAID生成的规则。 本文档适用于iOS 8.0及以上操作系统。

CAID的生成

生成CAID所依赖的设备指纹项

  • 手机型号:例如:iPhone7,2
  • 手机系统版本:例如:12.4.5
  • 硬盘存储容量:例如63989469184
  • 运营商名称:例如:中国联通
  • 系统更新时间:例如:1584021510.578670
  • 系统启动时间:例如:1596547081
  • 手机用户名:例如:rakeen的iphone
  • 手机国家代码:例如:CN
  • 设备内存大小:例如:1037041664

生成CAID的算法

    版本号_md5(硬盘存储容量++手机型号++设备内存大小++手机系统版本++系统更新时间)_md5(md5(手机用户名)++运营商名称++手机国家代码++系统启动时间)
    版本号当前为00,其中的“md5”是指用md5算法对数据进行hash,其结果用16进制表示成长度为32的由[0-9][A-F]组成的字符串(全部使用大写)
    CAID例子:00_6AC3BA5F0D4B9194D3867E2AEC7F5B20_955EAED409D0B4400EB6CBC71094B1F1

CAID在App的客户端的缓存及更新

    可以将CAID缓存在客户端的KeyChain中
    当新生成的CAID与KeyChain中的缓存不一致时,可以通知服务器端进行更新

相关参数获取

所需头文件

    #import <Foundation/Foundation.h>  

    #import <sys/sysctl.h>  

    #import <UIKit/UIDevice.h>  

    #import <CoreTelephony/CTTelephonyNetworkInfo.h>  

    #import <CoreTelephony/CTCarrier.h>  

    #import <CommonCrypto/CommonDigest.h>

`

  1. 手机型号 代码:

     //device model
     + (NSString *) getDeviceModel {
             size_t size;
             sysctlbyname("hw.machine", NULL, &size, NULL, 0);
             char *machine = malloc(size);
             sysctlbyname("hw.machine", machine, &size, NULL, 0); 
             NSString *platform = [NSString stringWithCString:machine
                     encoding:NSUTF8StringEncoding];
             free(machine);
             return platform;
     }
    
  2. 手机系统版本
    代码:

     //device system version
     + (NSString *) getSystemVersion {
             return [NSString stringWithFormat:@"%@",[UIDevice currentDevice].systemVersion]; 
     }
    
  3. 硬盘存储容量 代码:

     //file system size
     +(NSString *)getDiskSize {
             int64_t space = -1;
             NSError *error = nil;
             NSDictionary *attrs = [[NSFileManager defaultManager]
                     attributesOfFileSystemForPath:NSHomeDirectory() error:&error];
             if (!error) {
                     space = [[attrs objectForKey:NSFileSystemSize] longLongValue];
             }
             if(space < 0) { 
                     space = -1;
             }
             return [NSString stringWithFormat:@"%lld",space];
     }
    
  4. 运营商信息 代码:

     //carrier
     +(NSString* )getCarrierName {
             #if TARGET_IPHONE_SIMULATOR
                     return @"SIMULATOR";
             #else
             static dispatch_queue_t _queue;
             static dispatch_once_t once;
             dispatch_once(&once, ^{
                     _queue = dispatch_queue_create([[NSString stringWithFormat:@"com.carr.%@", self] UTF8String], NULL);
             });
             __block NSString *  carr = nil;
             dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
             dispatch_async(_queue, ^(){
                     CTTelephonyNetworkInfo *info = [[CTTelephonyNetworkInfo alloc] init]; CTCarrier *carrier = nil;
                     if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 12.1) {
                             if ([info respondsToSelector:@selector(serviceSubscriberCellularProviders)]) { #pragma clang diagnostic push
                                     #pragma clang diagnostic ignored "-Wunguarded-availability-new"
                                     NSArray *carrierKeysArray = [info.serviceSubscriberCellularProviders.allKeys
                                             sortedArrayUsingSelector:@selector(compare:)];
                                     carrier = info.serviceSubscriberCellularProviders[carrierKeysArray.firstObject]; 
                                     if (!carrier.mobileNetworkCode) {
                                             carrier = info.serviceSubscriberCellularProviders[carrierKeysArray.lastObject];
                                     }
                                     #pragma clang diagnostic pop
                             } 
                     }
                     if(!carrier) {
                             #pragma clang diagnostic push
                             #pragma clang diagnostic ignored "-Wdeprecated-declarations"
                             carrier = info.subscriberCellularProvider; #pragma clang diagnostic pop
                     }
                     if (carrier != nil) {
                             NSString *networkCode = [carrier mobileNetworkCode];
                             NSString *countryCode = [carrier mobileCountryCode];
                             if (countryCode && [countryCode isEqualToString:@"460"] &&networkCode) {
                                     if ([networkCode isEqualToString:@"00"] || [networkCode isEqualToString:@"02"] || [networkCode isEqualToString:@"07"] || [networkCode isEqualToString:@"08"]) {
                                             carr= @"中国移动"; 
                                     }
                                     if ([networkCode isEqualToString:@"01"] || [networkCode isEqualToString:@"06"] || [networkCode isEqualToString:@"09"]) {
                                             carr= @"中国联通"; 
                                     }
                                     if ([networkCode isEqualToString:@"03"] || [networkCode isEqualToString:@"05"] || [networkCode isEqualToString:@"11"]) {
                                             carr= @"中国电信"; 
                                     }
                                     if ([networkCode isEqualToString:@"04"]) { 
                                             carr= @"中国卫通";
                                     }
                                     if ([networkCode isEqualToString:@"20"]) {
                                             carr= @"中国铁通"; 
                                     }
                             }else {
                                     carr = [carrier.carrierName copy];
                             } 
                     }
                     if (carr.length <= 0) { 
                             carr = @"unknown";
                     }
                     dispatch_semaphore_signal(semaphore);
             });
             dispatch_time_t t = dispatch_time(DISPATCH_TIME_NOW, 0.5* NSEC_PER_SEC);
             dispatch_semaphore_wait(semaphore, t);
             return [carr copy];
             #endif
         }
    

5.系统版本更新时间 代码:

    //system update time
    +(NSString *)getSysU {
            NSString *result = nil;
            NSString *information =
                    @"L3Zhci9tb2JpbGUvTGlicmFyeS9Vc2VyQ29uZmlndXJhdGlvblByb2ZpbGVzL1B1YmxpY0luZm8vTU
                            NNZXRhLnBsaXN0";
            NSData *data=[[NSData alloc]initWithBase64EncodedString:information options:0];
            NSString *dataString = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
            NSError *error = nil;
            NSDictionary *fileAttributes = [[NSFileManager defaultManager] attributesOfItemAtPath:dataString error:&error];
            if (fileAttributes) {
                    id singleAttibute = [fileAttributes objectForKey:NSFileCreationDate];
                    if ([singleAttibute isKindOfClass:[NSDate class]]) {
                            NSDate *dataDate = singleAttibute;
                            result = [NSString stringWithFormat:@"%f",[dataDate timeIntervalSince1970]];
                    } 
            }
            return result;
    }

6.手机开机时间(会有秒级误差?) 代码:

    //system boot time
    +(NSString *) getSysB {
            struct timeval boottime;
            int mib[2] = {CTL_KERN, KERN_BOOTTIME};
            size_t size = sizeof(boottime);
            time_t uptime = -1;
            if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 && boottime.tv_sec != 0) {
                    uptime = boottime.tv_sec; 
            }
            NSString *result = [NSString stringWithFormat:@"%ld",uptime];
            return result;
    }

7.手机用户名摘要(MD5后上报) 代码:

    //device user name
    +(NSString *) getDeviceUName {
            NSString *result = [NSString stringWithFormat:@"%@",[UIDevice currentDevice].name];
            return [[self class] getMD5:result ? result : @"unknown"];
    }

8.手机国家代码 代码:

    //country coude
    +(NSString *)getCountryCode {
            NSLocale *currentLocale = [NSLocale currentLocale];
            NSString *countryCode = [currentLocale objectForKey:NSLocaleCountryCode];
            return countryCode;
    }

9.设备内存大小 代码:

    //device RAM
    +(NSString *)getRAM {
            unsigned long long physicalMemory = [[NSProcessInfo processInfo] physicalMemory];
            NSString *strResult = [NSString stringWithFormat:@"%llu",physicalMemory];
            return [strResult copy];
    }

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