![]() On T1, S2, S3, and A9 or later A-series processors, each Secure Enclave S2, Apple S3, Apple A7, or later A-series processors.Īnd you may deduce that any older CPU version has not.Įvery iOS device has a dedicated AES-256 crypto engine built into theĭMA path between the flash storage and main system memory The Secure Enclave is a coprocessor fabricated in the Apple T1, Apple You may note that some devices have a Security Enclave: You may take a look on the iOS Security Guide for businessĪpparently, if you can get the CPU series name, you may also deduce which cryptographic component and how it works from the documentation. (Thus, my question is not a duplicate of this one, as circumstances have since changed.) Also, getting a list of those seems difficult - Apple's open source web site runs an automated process to scrub all ARM-specific code from the OS source they give out publicly in order to make jailbreakers work harder. Mac OS has sysctlbyname with hw.optional.*.īut what about iOS? The iOS kernel has hw.optional.* like Mac OS, but it is locked down in iOS 10. Android has a cpufeatures library (and /proc/cpuinfo still works anyway). On Linux, /proc/cpuinfo is the way to go. In Windows, IsProcessorFeaturePresent works for detecting ARM CPU features. ![]() It is not possible to detect CPU features on ARM without OS cooperation. While x86 CPUs have the cpuid instruction to detect features, even from user mode, the ARM equivalent is privileged. Porting this has been straightforward so far, with Windows, Linux and Android being easy.īut in iOS it does not seem easy. I have some cryptography code that has multiple implementations, selecting which implementation at runtime based on the features of the CPU it is running on.
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