hack-different
apple-knowledge
Ruby

A collection of reverse engineered Apple things, as well as a machine-readable database of Apple hardware

Last updated Jul 7, 2026
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README

Apple Data Formats and Knowledge

A collection of reverse engineered Apple formats, protocols, or other interesting bits.

Join us on Discord - Discord Rules

Repo inspired by Papers we Love

Our Tooling Repos

Our Homebrew Tap

Install our tap with brew tap hack-different/homebrew-jailbreak

Information about the maintaining of that tap can be found at homebrew-jailbreak

Contributing and a warning

Linking your Discord and GitHub

We want this collection to be around for new jailbreakers and hobbyists for years to come, so we must say: this collection accepts (with gratitude) pull-requests that improve it, but under no circumstances will a PR based on AppleInternal, or any other copyrighted works protected by the DMCA be accepted. If you need help determining this, tag the PR with license help, join the Discord server, and ask a #Legit or higher role for help.

Violation of the DMCA or Copyright law is the responsibility of the submitter.

Primary Data Source

We attempt to derive from machine sources and produce machine readable files (YAML) in this repo under _data. For information about creating and extending data format see Data Format Guidance.

Updates and additions there should automatically be reflected in the documents

hack-different/apple-knowledge/_data

Another authoritative source of information is the open source code released by Apple themselves at one of the following locations:

Tools

Libraries for Binary Analysis and Modification

See docs/Binary_Tooling

Tools for Binary Analysis and Modification

* alephsecurity/xnu-qemu-arm64-tools * Build iOS on QEMU * onethawt/idaplugins-list * cellebrite-srl/ida_kernelcache * cellebrite-srl/PacExplorer * cellebrite-srl/FunctionInliner * hack-different/iBoot-IDA * matteyeux/ida-iboot-loader * haiyuidesu/sephelper * Cisco-Talos/GhIDA * avast/retdec-idaplugin * cxnder/bn-dyldsharedcache * jonpalmisc/ObjectiveNinja * EliseZeroTwo/iBoot-Binja-Loader * matteyeux/seprom-loader * skr0x1c0/binja_kc * AllsafeCyberSecurity/awesome-ghidra * 0x36/ghidra_kernelcache * QEMU Apple Branch * geohot/qira

Guides and General

OS Internals by Jonathan Levin

Devices

* T2 Dev Team: t8012 / Apple T2 / bridgeOS * Duo Labs: Apple T2 XPC * t2linux/apple-bce-drv
  • Wi-Fi / Bluetooth
* seemoo-lab/frankenstein * seemoo-lab/internalblue * acidanthera/VirtualSMC * t8012/smcutil - Create SMC binaries from update payloads

Kernel General

* Apple's XNU Tarballs * Kernel Programming Guide * IOKit Fundamentals * Virtual Memory System

Protocols / Formats

Bootloader Related

  • EFI
* EFI * NVRAM unlock * apple/darwin-xnu * iBoot Firebloom * OpenJailbreak/iBootRE OS iBoot
  • SecureROM
* SecureROM Binaries
  • TXM - Trusted eXecutation Monitor
* TXM & SPTM

Archive / Disk Formats

  • APFS - Apple Filesystem
* Apple APFS Reference * sgan81/apfs-fuse * libyal/libfsapfs * cugu/apfs.ksy * bxl1989 APFS Remount * iineva/bom
  • pbzx
  • Apple Disk Image - dmg
* jhermsmeier/node-udif * nlitsme/encrypteddmg * darlinghq/darling-dmg
  • Signed System Volumes (SSV) / root_hash

Databases / Serialization

  • Property Lists
* libimobiledevice/libplist
  • iTunes database
* jeanthom/libitlp * josephw/titl *
  • Apple iDevice Backup Format
* rickmark/libibackup * horrorho/InflatableDonkey

Image, Sound and Other Resources

* Using a Custom Startup Sound on a Power Macintosh G3 Blue and White
  • AirPlay2
* mikebrady/shareport-sync

Software Update / Installers

Code and Signature Formats

* sbingner/ldid - Codesign tool * ProcursusTeam/ldid - Alternative to sbingner/ldid with some updates for iOS 15 and general fixes * m4b Mach Binaries * J's Entitlements Database * Levin's Code Signing * Apple CTF / Compact Type Format
  • img4 - Apple signed images, version 4
* TheiPhoneWiki's documentation on IMG4 files * xerub/img4lib * m1stadev/PyIMG4 - A Python library/CLI tool for parsing IMG4 * tihmstar/img4tool * h3adshotzz/img4helper
  • TrustCache - Pre-authorized Binary Hashes
* Apple Platform Security - Trust caches * t8012/go-aapl-integrity * CRKatri/trustcache
  • EALF - eficheck baselines
* t8012/go-aapl-integrity * t8012/efivalidate * EALF
  • ChunkList - Used to verify macOS Recovery / Internet Recovery
* t8012/go-aapl-integrity
  • dyld and DSC (dyld Shared Cache)
* Levin's Dyld * rickmark/yolo_dsc - Used as last resort and depend on Xcode * arandomdev/DyldExtractor - Fixes up linking * dyldsharedcache_util.cpp
  • iBoot LocalPolicy, RemotePolicy and BAA signing
* M1Boot_Policy
  • Rosetta2
* ProjectChampollion
  • Swift
* Swift Mangling

Sandbox or 'Seatbelt'

Secure Enclave Processor

* Mirror of presentation * mwpcheung/AppleSEPFirmware

ARM / x86

  • ARM General
* ARMv8 Overview * ARMv8 ARM ARM (Architecture Reference Manual) * ARMv8-A Tools * ARM Software Standards * Siguza's ARM Bootcamp
  • Apple CPUs
* Asahi: Introduction to Apple Silicon * dougallj's applecpu
  • Compilers
* ARM Clang PAC ABI
  • ARM Mitigations
* APRR * PAN * SPRR & GXF

Hypervisor / Virtualization

  • Apple Hypervisor
* Official documentation * Hypervisor on Apple Silicon

Baseband

  • baseband.yaml in Data Files
  • Qualcomm
* hack-different/apple-baseband * Hexagon DSP * Hexagon SDK * Hexagon QEMU * Binary Ninja Hexagon * Hexag00n * IDA Hexagon * idp_heaxagon

Coprocessors

* 19h/ftab-dump

USB / Wired Protocols / Low Level Hardware

  • Basically all iDevice / iTunes
* libimobiledevice.org * libimobiledevice/libimobiledevice * hack-different/python-libimobiledevice * doronz88/pymobiledevice3
  • DFU / Recovery
* libimoibledevice/libirecovery * Technical analysis of the checkm8 exploit
  • usbmuxd - USB transport for iDevices
* libimobiledevice/usbmuxd * t8012/demuxusb
  • com.apple.restored - iDevice Restore Protocol
* libimobiledevice/idevicerestore
  • UTDM - USB Target Disk Mode
* rickmark/apple_utdm
  • USB-C Power Delivery - Vendor Defined Messages
* USB-C Port Controller (ACE) Secrets * rickmark/macvdmtool
  • Lightning
* http://ramtin-amin.fr/#tristar *
  • NVMe / NAND / PCIe
* *

Network / Wireless / Transit

  • Apple Wi-Fi Password Sharing
* seemoo-lab/openwifipass
  • AWDL - Apple Wireless Distribution Link
* Findings from Ian Beer, Project Zero
  • Bluetooth Bonjour (Service Discovery)
  • iCloud
* nicolas17/mesu-archive * * XPoCe
  • macOS Internet Recovery
* rickmark/applenet_recovery * Internet Recovery

System Configuration and State

  • FDR - Factory Data Restore
  • SysCfg - System Configuration - Serial Number and other Device Info
  • APTicket - The root of an authorized version set

Diagnostic Protocols

  • AWDD - Apple Wireless Diagnostics (misnomer, more than wireless, system trace)
* rickmark/awdd_decode
  • Mojo Serial
* MojoKDP.kext.S
  • Apple "tailspin"
  • Apple tracev3 Unified Logging
* ydkhatri/UnifiedLogReader * dtformats
  • XHC20 USB Capture
*
hack-different/demuxusb/ext/pcapng.h

Jailbreaks

* checkra1n 1337
* 8.0 * 8.1.2 * 8.1.3 * 8.4

Jailbreak Tooling

Jailbreak Slides

X-Plat

* iphonelinux

Safety / Protection

CREDITS

Hack Different - Apple Knowledge is a product of the entire community and belongs to the community. It is facilitated by the volunteer work of the Hack Different moderation team.

If you have issue with the design or workflow of this repository, blame me (rickmark) as I setup and configured most of it. (it me). If you have feedback, join the #apple-knowledge channel of the discord server.

Portions of data and knowledge come from TheiPhoneWiki, libimobiledevice's website, and checkra1n's website, as well as the individuals who brought you those projects (and many more!)

Special mention to Jonathan Levin and Amit Singh for taking the time to publish books on these topics.

OS Internals - User Mode by Levin OS Internals - Kernel Mode by Levin OS Internals - Security by Levin

A list of all projects and their contributors is at CREDITS and is updated by a script. If there are persons not updated due to limitations, please PR the CREDITS page and call them out.

Setting up overcommit, the linters, and the build

Main article is in BUILD

To keep the repo, docs, and data tidy, we use a tool called overcommit` to connect up the git hooks to a set of quality checks. The fastest way to get setup is to run the following to make sure you have all the tools:

brew install hunspell
gem install overcommit bundler
bundle install
overcommit --install

Why not \

Wiki's best serve prose, and part of the goal here is to leverage machine readable and ingestable information with human augmentation wherever possible.

As of 2022, GitHub has 56 million users. That means that there are 56 million people who are able to contribute directly to this repo via a fork and PR, in opposition to wiki's which have a relatively small number of potential editors. The PR process also allows for modifications to be reviewed, commented and debated before inclusion.

License

The contents of this repo are dual-licensed:

Code and data licensed under the MIT license

Documents also licensed under the CC-BY-SA

Creative Commons License{style="border-width:0"} {rel=license} Apple Knowledge{:xmlns:dct="http://purl.org/dc/terms/", :property="dct:title"} by Hack Different{:xmlns:cc="http://creativecommons.org/ns#", :property="cc:attributionName", :rel="cc:attributionURL"} is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License{:rel="license"}

Dedication

Here’s to the crazy ones, the misfits, the rebels, the troublemakers
>
the round pegs in the square holes…
>
the ones who see things differently — they’re not fond of rules…
>
You can quote them, disagree with them, glorify or vilify them, but the only thing you can’t do is ignore them because
they change things…
>
They push the human race forward, and while some may see them as the crazy ones,
>
we see genius,
>
because the ones who are crazy enough to think that they can change the world,
>
are the ones who do.
>
— Steve Jobs, 1997

Also dedicated to the volunteer work of those who use this for good, and deny the shadow to those who seek to harm.

© 2026 GitRepoTrend · hack-different/apple-knowledge · Updated daily from GitHub