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Decrypting Firmwares
Contents
1.0.x
If you want to decrypt 1.0.x iPhone Ramdisks, you must remove some trash from the beginning of them. You can do this in Terminal.app (on Mac OS X you can find them in /Applications/Utilities/).
- Unzip firmware image (change extension .ipsw to .zip and double click on archive) and find restore ramdisk.
- In Terminal.app, run
dd if=restore_ramdisk.dmg of=restore_ramdisk.stripped.dmg bs=512 skip=4 count=37464 conv=sync
Where restore_ramdisk.dmg is image of restore ramdisk (for example 1.0 iPhone firmware restore ramdisk is 694-5259-38.dmg), and restore_ramdisk.stripped.dmg is 'decrypted' image, that you can mount and explore from Finder.
NOTE: If after mounting stripped ramdisk you see errors, ignore them.
1.1.x
To decrypt the 1.1.x Ramdisks, you must do a little extra work.
- Strip the first 0x800 bytes. (2 kilobytes[1])
- In Terminal.app, run
openssl enc -d -in ramdisk.dmg -out de.dmg -aes-128-cbc -K 188458A6D15034DFE386F23B61D43774 -iv 0
This uses the iPhone's 0x837 key which was first leaked by Zibri and had its purpose revealed on Geohot's (now closed) blog.
2.x+
The ramdisks on 2.x and up firmwares is a simple IMG3 file that you can decrypt using img3decrypt[2] or xpwntool[3]. You must download one of these utilities. For easier access, put them in /usr/local/bin on Unix-based and Linux-based machines or wherever on Windows. If you use Windows, you must use the cd command to navigate to the XPwn directory.
If you're using img3decrypt, run this:
img3decrypt e restore_ramdisk.dmg restore_ramdisk_decrypted.dmg "Ramdisk_IV" "Ramdisk_Key"
If you're using xpwntool, run this:
xpwntool restore_ramdisk.dmg restore_ramdisk_decrypted.dmg -k "Ramdisk_Key" -iv "Ramdisk_IV"
Where restore_ramdisk.dmg is image of restore ramdisk and restore_ramdisk_decrypted.dmg is decrypted image, that you can mount and explore from Finder. "Ramdisk_IV" and "Ramdisk_Key" is the decryption keys that you can find at the VFDecrypt Keys page or in the Info.plist from PwnageTool FirmwareBundles folder.
Because of the new HFS Compression used in Snow Leopard and 3.0 DMGs, you may see zero-sized files in the DMG if you don't use Snow Leopard. In order to extract those, check Talk:Obtaining Decryption Keys.
