How to detect an Iphone X programmatically?

Swift and Objective-C developer tutorial on how to detect if an app is running on iPhone X
12 October 2017   21306

If you have an iOS app, now, with release of iPhone X you can face some new issues. In this tutorial, we will show you how to programmatically detect if an application is running on iPhone X.

Unfortunatelly, there is no direct methods on how to solve this issue. But let's use backdoor. Iphone X screen is 1125px X 2436px. So, we can use this information to solve this task.

Swift 3 and upper

if UIDevice().userInterfaceIdiom == .phone {
        switch UIScreen.main.nativeBounds.height {
        case 1136:
            print("iPhone 5 or 5S or 5C")
        case 1334:
            print("iPhone 6/6S/7/8")
        case 2208:
            print("iPhone 6+/6S+/7+/8+")
        case 2436:
            print("iPhone X")
        default:
            print("unknown")
        }
    }

Objective C

    if([[UIDevice currentDevice]userInterfaceIdiom]==UIUserInterfaceIdiomPhone) {

        switch ((int)[[UIScreen mainScreen] nativeBounds].size.height) {

            case 1136:
                printf("iPhone 5 or 5S or 5C");
                break;
            case 1334:
                printf("iPhone 6/6S/7/8");
                break;
            case 2208:
                printf("iPhone 6+/6S+/7+/8+");
                break;
            case 2436:
                printf("iPhone X");
                break;
            default:
                printf("unknown");
        }
    }

or use screenSize.height as float 812.0f not int 812   

if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
    CGSize screenSize = [[UIScreen mainScreen] bounds].size;
    if (screenSize.height == 812.0f)
        NSLog(@"iPhone X");
}

Notice

DO NOT use the userInterfaceIdiom property to identify the device type, as the apple documentation explains,

For universal applications, you can use this property to tailor the behavior of your application for a specific type of device. For example, iPhone and iPad devices have different screen sizes, so you might want to create different views and controls based on the type of the current device.
 

Apple documentation

This property is just used to identify the running app's view style. However, the iPhone app (not the universal) could be installed in iPad device via App store, in that case, the userInterfaceIdiom will return the UIUserInterfaceIdiomPhone, too.

The right way is to get the machine name via uname.

Google to Introduce Tink Cryptographic Library

Google already uses Tink in projects like AdMob, Google Pay, Google Assistant, Firebase and the Android Search App
31 August 2018   1328

Google introduced the open cryptographic library called Tink with support for Java, C ++ and Objective-C, as well as experimental support for Go and JavaScript. Product primitives use the BoringSSL and the Java Cryptography Architecture framework.

Even small errors in the use of cryptographic methods can have serious consequences, and they are carefully study for decades. Many developers do not have so much time, so when creating a new tool, the company tried to reduce the number of potential errors with cryptographic APIs. Google already uses Tink in projects like AdMob, Google Pay, Google Assistant, Firebase and the Android Search App.

These primitives are used in the core of the library:

  • AEAD (Authenticated Encryption with Associated Data) for symmetric encryption of blocks and data streams over a fixed key. The tool does not require the definition of specific algorithms and their parameters. With it, you can quickly perform encryption and decryption operations:
    import com.google.crypto.tink.Aead;
     import com.google.crypto.tink.KeysetHandle;
     import com.google.crypto.tink.aead.AeadFactory;
     import com.google.crypto.tink.aead.AeadKeyTemplates;
     // 1. Generate the key material.
     KeysetHandle keysetHandle = KeysetHandle.generateNew(
     AeadKeyTemplates.AES256_EAX);
     // 2. Get the primitive.
     Aead aead = AeadFactory.getPrimitive(keysetHandle);
     // 3. Use the primitive.
     byte[] plaintext = ...;
     byte[] additionalData = ...;
     byte[] ciphertext = aead.(plaintext, additionalData);
  • The MAC (Message Authentication Codes) provides message authentication codes.

In Tink, there are functions for creating a digital signature and its verification, as well as the functions of fast hybrid encryption.

Features of work
Each primitive supports stateless mode operation, secure copy operations and the use of keys with a length of 128 bits. The library automatically blocks potentially unsafe operations, for example, downloading keys from unencrypted files on the disk. Tink provides an API for rotating keys and interacting with external key management systems: Google Cloud KMS, Amazon KMS, Android Keystore and Apple iOS KeyChain.

The library has a modular architecture, allows you to connect custom primitives and replace them with existing code files without changing the final applications. From Tink, you can exclude part of the tools. For example, if the program only uses digital signature verification, you can remove symmetric encryption components to reduce the application code size.

In August 2018, the creators of the VPN protocol, WireGuard, announced the creation of the Zinc cryptographic library, which, upon introduction into the core Linux kernel, will accelerate the process of data encryption through a simplified set of crypto algorithms.