Talk:Northstar 7D11 (iPhone1,1)

Decryption of Kernelcache

Has anyone had any success decrypting the kernelcache of any of the 3.1.2 or 3.1 firmwares? Using the newest build of xpwntool, I still get thrown an error. Seems it may have to do with the compression of the kernelcache...

~/iPhone1,1_3.1.2_7D11_Restore$ xpwntool kernelcache.release.s5l8900x kernel.bin -iv 25B7F586D184C329D3D05953A6516A36 -k DD03B5B52A53D3582B18A0052EF84038
/home/admin/xpwn/ipsw-patch/img3.c:createAbstractFileFromImg3:613: 9de439b226a7982d45bb64afc9c4f9b1cf955bdcf0f4675e95be7784b3169a4a
/home/admin/xpwn/ipsw-patch/lzssfile.c:createAbstractFileFromComp:112: mismatch: 4073636 7933935 7933952 ba 8a
error: cannot open infile

--Cool name 14:28, 10 October 2009 (UTC)

until 7a341, the last block of the DATA section was not encrypted, since 7c144, it -is- encrypted, this may cause problems in xpwntool.

i wrote my own tools for extracting img3 files, see this page

these don't have problems extracting recent updater files

Itsme 21:01, 10 October 2009 (UTC)

ahh very nice, thank you Itsme. I succeeded in using decodeimg3.pl along with lzssdec to decrypt and unpack the kernel. however, say i have patched the kernel to my liking and want to re-pack and re-encrypt it, do you have any idea how to do this? thanks. --Cool name 00:48, 11 October 2009 (UTC)