SecKeyCreateRandomKey for SecureEnclave crash on iOS 13 simulator

Question

jefferson.setiawan OP

Created May ’22

Replies 4

Boosts 0

Views 1.4k

Participants 3

I've encountered strange crash while using SecKeyCreateRandomKey on iOS 13.4 and 13.5 simulators.

I've used that to generate a private key that will stored in Secure Enclave. I think the crash happen on this attribute (needed to store the key to the Secure Enclave).

kSecAttrTokenID as String: kSecAttrTokenIDSecureEnclave,

I've tried enabling Swift Error Breakpoint, Exception Breakpoint, Symbolic Breakpoint, activating address sanitizer and zombie objects but I don't still get any useful information.

This is the repo to reproduce the crash (Make sure you choose iOS 13 simulators) https://github.com/jeffersonsetiawan/SecureEnclaveCrash/

Thank you.

Answered by DTS Engineer in 714594022

It work on ios 15 simulator

OK, then my answer is “Don’t do that.” (-:

Normally I’d suggest that you file a bug against the simulator but that’s not going to get any traction for the iOS 13 simulator.

If the crash is causing you grief — perhaps you rely on the simulator for iOS 13 compatibility testing — add code to your app that, in the simulator build only, disables the Secure Enclave code when running on older versions of iOS.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

Boost

Answer 1

jefferson.setiawan OP

May ’22

Here is the crash Thread 1: EXC_BAD_ACCESS (code=1, address=0x18)

0

Answer 2

DTS Engineer OP

Apple

May ’22

I've encountered strange crash while using SecKeyCreateRandomKey on iOS 13.4 and 13.5 simulators.

So, does that mean that things work on newer simulators?

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

0

Answer 3

MobileTen OP

May ’22

If running on the simulator the MacBook must be equipped with a touch bar or touch id otherwise should be supported on an A7 or later A-series CPU. To prevent the crash on a sim with a touch bar or touch id remove kSecAttrTokenID as String: kSecAttrTokenIDSecureEnclave, or exclude it from sim builds.

https://developer.apple.com/documentation/security/certificate_key_and_trust_services/keys/storing_keys_in_the_secure_enclave

0

Answer 4

DTS Engineer OP

Apple

May ’22

Accepted Answer

It work on ios 15 simulator

OK, then my answer is “Don’t do that.” (-:

Normally I’d suggest that you file a bug against the simulator but that’s not going to get any traction for the iOS 13 simulator.

If the crash is causing you grief — perhaps you rely on the simulator for iOS 13 compatibility testing — add code to your app that, in the simulator build only, disables the Secure Enclave code when running on older versions of iOS.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

0