I would also suggest changing over from uniqueIdentifier to this open source library (2 simple categories really) that utilize the device’s MAC Address along with the App Bundle Identifier to generate a unique ID in your applications that can be used as a UDID replacement.
Keep in mind that unlike the UDID this number will be different for every app.
You simply need to import the included NSString and UIDevice categories and call [[UIDevice currentDevice] uniqueDeviceIdentifier] like so:
#import "UIDevice+IdentifierAddition.h"
#import "NSString+MD5Addition.h"
NSString *iosFiveUDID = [[UIDevice currentDevice] uniqueDeviceIdentifier]
You can find it on Github here:
UIDevice with UniqueIdentifier for iOS 5
Here are the categories (just the .m files - check the github project for the headers):
UIDevice+IdentifierAddition.m
#import "UIDevice+IdentifierAddition.h"
#import "NSString+MD5Addition.h"
#include <sys/socket.h> // Per msqr
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_dl.h>
@interface UIDevice(Private)
- (NSString *) macaddress;
@end
@implementation UIDevice (IdentifierAddition)
////////////////////////////////////////////////////////////////////////////////
#pragma mark -
#pragma mark Private Methods
// Return the local MAC addy
// Courtesy of FreeBSD hackers email list
// Accidentally munged during previous update. Fixed thanks to erica sadun & mlamb.
- (NSString *) macaddress{
int mib[6];
size_t len;
char *buf;
unsigned char *ptr;
struct if_msghdr *ifm;
struct sockaddr_dl *sdl;
mib[0] = CTL_NET;
mib[1] = AF_ROUTE;
mib[2] = 0;
mib[3] = AF_LINK;
mib[4] = NET_RT_IFLIST;
if ((mib[5] = if_nametoindex("en0")) == 0) {
printf("Error: if_nametoindex error\n");
return NULL;
}
if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {
printf("Error: sysctl, take 1\n");
return NULL;
}
if ((buf = malloc(len)) == NULL) {
printf("Could not allocate memory. error!\n");
return NULL;
}
if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
printf("Error: sysctl, take 2");
return NULL;
}
ifm = (struct if_msghdr *)buf;
sdl = (struct sockaddr_dl *)(ifm + 1);
ptr = (unsigned char *)LLADDR(sdl);
NSString *outstring = [NSString stringWithFormat:@"%02X:%02X:%02X:%02X:%02X:%02X",
*ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];
free(buf);
return outstring;
}
////////////////////////////////////////////////////////////////////////////////
#pragma mark -
#pragma mark Public Methods
- (NSString *) uniqueDeviceIdentifier{
NSString *macaddress = [[UIDevice currentDevice] macaddress];
NSString *bundleIdentifier = [[NSBundle mainBundle] bundleIdentifier];
NSString *stringToHash = [NSString stringWithFormat:@"%@%@",macaddress,bundleIdentifier];
NSString *uniqueIdentifier = [stringToHash stringFromMD5];
return uniqueIdentifier;
}
- (NSString *) uniqueGlobalDeviceIdentifier{
NSString *macaddress = [[UIDevice currentDevice] macaddress];
NSString *uniqueIdentifier = [macaddress stringFromMD5];
return uniqueIdentifier;
}
@end
NSString+MD5Addition.m:
#import "NSString+MD5Addition.h"
#import <CommonCrypto/CommonDigest.h>
@implementation NSString(MD5Addition)
- (NSString *) stringFromMD5{
if(self == nil || [self length] == 0)
return nil;
const char *value = [self UTF8String];
unsigned char outputBuffer[CC_MD5_DIGEST_LENGTH];
CC_MD5(value, strlen(value), outputBuffer);
NSMutableString *outputString = [[NSMutableString alloc] initWithCapacity:CC_MD5_DIGEST_LENGTH * 2];
for(NSInteger count = 0; count < CC_MD5_DIGEST_LENGTH; count++){
[outputString appendFormat:@"%02x",outputBuffer[count]];
}
return [outputString autorelease];
}
@end
