Some WIP code to deal with img4 files in a decent manner.

Prereq: either libcompression or liblzfse; or build one in-tree (has precedence) git submodule init && git submodule update && make -C lzfse [CC="cross-cc"] [LD="cross-ld"]

Build: make [CC="cross-cc"] [LD="cross-ld"] [CORECRYPTO=1] [COMMONCRYPTO=1] COMMONCRYPTO=1 use Apple CommonCrypto instead of OpenSSL (Darwin-only) CORECRYPTO=1 use the included corecrypto sources (has precedence)

Examples:

./img4 \ -i DeviceTree.n51ap.im4p \ -o dtre.img4 \ -M manifest.im4m \ -N 0x1122334455667788 \ -T rdtr

./img4 \ -i kc_iPhone6,1_9.0_13A344.im4p \ -o krnl.img4 \ -k a6ff60f2fcf3cdcaaf735e1683418ff56828540cd92ac15f3144ed4dc9d5bcb34c01cc8154bc22c3658d82b6c439340b \ -M manifest.im4m \ -N 0x1122334455667788 \ -P kc_iPhone6,1_9.0_13A344.bpatch \ -D \ -T rkrn

Patches for kc_iPhone6,1_9.0_13A344:

AMFI

0x006AF484 0xF6 0xE0 0x006AF485 0x57 0x03 0x006AF486 0xBD 0x00 0x006AF487 0xA9 0x32 0x006AF488 0xF4 0xC0 0x006AF489 0x4F 0x03 0x006AF48A 0x01 0x5F 0x006AF48B 0xA9 0xD6

MAC

0x004823CC 0x00 0x00 0x004823CD 0x05 0x00 0x004823CE 0x40 0x80 0x004823CF 0xF9 0x52

0x00F5595C 0xB2 0x00

0x00F5595D 0x3E 0x00

0x00F5595E 0x00 0x80

0x00F5595F 0x94 0x52

-xerub