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GenPass
GenPass generates the VFDecrypt keys for the filesystem image of an iDevice. It requires either a decrypted restore or update ramdisk.
Note: in the firmwares, the decryption happens in /usr/sbin/asr, which can be found on the ramdisk.
NOTE: I've experienced that running genpass after you've mounted the decrypted ramdisk causes genpass to give a false key.
GenPass Usage
./genpass <platform> <ramdisk> <filesystem>
Platform is the applications processor (i.e.- S5L8900x, S5L8720x, S5L8920x, S5L8922x, S5L8930x)
Source
http://github.com/posixninja/genpass
