UIDevice.uniqueIdentifier replace to Application UUID

UDIDReplace.h

//
//  UDIDReplace.h
//
//  Created by ishinao on 12/02/14.
//
//  fork from
//      https://gist.github.com/1161447
//      https://gist.github.com/1743326
//

#import <Foundation/Foundation.h>
#import <Security/Security.h>    

@interface UIDevice (UDDIReplace)

-(NSString*)uniqueIdentifier;
-(void)resetUniqueIdentifier;

@end

UDIDReplace.m

//
//  UDIDReplace.m
//
//  Created by ishinao on 12/02/14.
//
//  fork from
//      https://gist.github.com/1161447
//      https://gist.github.com/1743326
//

#import "UDIDReplace.h"

static NSString * const UIDIReplace_Key = @"uniqueInstallationIdentifier";

@implementation UIDevice (UDIDReplace)

-(NSString*)uniqueIdentifier {
    NSString *uuidString = nil;
    
    NSDictionary *query = [NSDictionary dictionaryWithObjectsAndKeys:
                           (id)kSecClassGenericPassword,            (id)kSecClass,
                           UIDIReplace_Key,                         (id)kSecAttrGeneric,
                           UIDIReplace_Key,                         (id)kSecAttrAccount,
                           [[NSBundle mainBundle] bundleIdentifier],(id)kSecAttrService,
                           (id)kSecMatchLimitOne,                   (id)kSecMatchLimit,
                           (id)kCFBooleanTrue,                      (id)kSecReturnAttributes,
                           nil];
    NSDictionary *attributes = nil;
    OSStatus result = SecItemCopyMatching((CFDictionaryRef)query, (CFTypeRef *)&attributes);
    if (result == noErr) {
        
        NSMutableDictionary *valueQuery = [NSMutableDictionary dictionaryWithDictionary:attributes];
        [attributes release];
        
        [valueQuery setObject:(id)kSecClassGenericPassword  forKey:(id)kSecClass];
        [valueQuery setObject:(id)kCFBooleanTrue            forKey:(id)kSecReturnData];
        
        NSData *passwordData = nil;
        OSStatus result = SecItemCopyMatching((CFDictionaryRef)valueQuery, (CFTypeRef *)&passwordData);
        if (result == noErr) {
            uuidString = [[[NSString alloc] initWithBytes:[passwordData bytes]
                                                   length:[passwordData length]
                                                 encoding:NSUTF8StringEncoding] autorelease];
            [passwordData release];
            
        }
    }
    
    if (uuidString == nil) {
        CFUUIDRef uuidRef = CFUUIDCreate(kCFAllocatorDefault);
        uuidString = (NSString *)CFUUIDCreateString(kCFAllocatorDefault, uuidRef);
        [uuidString autorelease];
        CFRelease(uuidRef);
        NSMutableDictionary *query = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                      (id)kSecClassGenericPassword,             (id)kSecClass,
                                      UIDIReplace_Key,                          (id)kSecAttrGeneric,
                                      UIDIReplace_Key,                          (id)kSecAttrAccount,
                                      [[NSBundle mainBundle] bundleIdentifier], (id)kSecAttrService,
                                      @"",                                      (id)kSecAttrLabel,
                                      @"",                                      (id)kSecAttrDescription,
                                      nil];
        
        if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 4) {
            [query setObject:(id)kSecAttrAccessibleAfterFirstUnlock forKey:(id)kSecAttrAccessible];
        }
        [query setObject:[uuidString dataUsingEncoding:NSUTF8StringEncoding] forKey:(id)kSecValueData];
        
        OSStatus result = SecItemAdd((CFDictionaryRef)query, NULL);
        if (result != noErr) {
            NSLog(@"[ERROR] Couldn't add the Keychain Item. result = %ld query = %@", result, query);
            return nil;
        }
    }
    
    return uuidString;
}


-(void)resetUniqueIdentifier {
    NSDictionary *query = [NSDictionary dictionaryWithObjectsAndKeys:
                           (id)kSecClassGenericPassword,            (id)kSecClass,
                           UIDIReplace_Key,                         (id)kSecAttrGeneric,
                           UIDIReplace_Key,                         (id)kSecAttrAccount,
                           [[NSBundle mainBundle] bundleIdentifier],(id)kSecAttrService,
                           nil];
    OSStatus result = SecItemDelete((CFDictionaryRef)query);
    if (result == noErr) {
        NSLog(@"[INFO}  Unique Installation Identifier is successfully reset.");
    } else if (result == errSecItemNotFound) {
        NSLog(@"[INFO}  Unique Installation Identifier is successfully reset.");
    } else {
        NSLog(@"[ERROR] Coudn't delete the Keychain Item. result = %ld query = %@", result, query);
    }
}


@end