[iOS18] ipsw extract is not working due to Apple Encrypted Archive

[triceratops-with-a-single-horn]

Apple released iOS 18 beta IPSWs today. When I try to run ipsw extract it's failing when it tries to mount the image.

Looking at the file structure it looks like some of the DMG files have .aea extension, which indicates Apple Encrypted Archive per this wiki

➜ ls ./iPhone14,2_18.0_22A5282m_Restore
090-27569-036.dmg.aea        090-28378-068.dmg            BuildManifest.plist          RestoreVersion.plist
090-27766-071.dmg            090-28659-047.dmg            Firmware                     SystemVersion.plist
090-27884-068.dmg            090-28659-047.dmg.aea        Restore.plist                kernelcache.release.iphone14

I tried to decrypt the file using aea command but it's (not surprisingly) giving "-key or -key-value is required" error.

➜ aea decrypt -i 090-28659-047.dmg.aea -o out.dmg
-key or -key-value is required

and trying random keys (again not surprisingly) is not working

➜ aea decrypt -i 090-28659-047.dmg.aea -o out.dmg -key ./key
Failed to unlock container
Error 0xcf058400
Main key derivation failed (-1001)
Main key derivation
unlock container

Steps to reproduce

• Download any of the iOS 18 beta (22A5282m) IPSW files from Apple's downloads page such as this one
• Run ipsw extract /path/to/downloaded/IPSW -d
• Notice the error message ⨯ failed to IPSW FS dmg: failed to mount 090-28659-047.dmg.aea: exit status 1: hdiutil: attach failed - image not recognized

ipsw version
Version: 3.1.492, BuildCommit: 0e84bf8

[blacktop]

Try latest release. Let me know if there's still issues (requires to be ran on darwin due to aea bin requirement (for now))

[blacktop]

darwin no longer a requirement.