System 357 pkg decryption

[Arcade-Projects]

Hi all,

I got myself an update usb for a 357 title. Game update files are presented as pkg files, so I think there could be a way to decrypt the game contents directly.

The header block appears to follow the same structure as used in regular ps3 consoles. According to pkg header information documented [url=http://www.psdevwiki.com/ps3/PKG_files#File_Header_2]here[/URL], the packages identified themselves as debug pkg.

Offset 0 1 2 3 4 5 6 7 8 9 A B C D E F

00000000 7F 50 4B 47 00 00 00 01 00 00 00 C0 00 00 00 08 PKG À
00000010 00 00 00 C0 00 00 06 15 00 00 00 00 CB 2D E6 50 À Ë-æP
00000020 00 00 00 00 00 00 01 80 00 00 00 00 CB 2D E4 70 € Ë-äp
00000030 55 50 30 30 30 31 2D 53 43 45 45 58 45 30 30 30 UP0001-SCEEXE000
00000040 5F 30 30 2D 46 55 4C 4C 50 41 43 4B 41 47 45 30 _00-FULLPACKAGE0
00000050 30 30 30 31 00 00 00 00 00 00 00 00 00 00 00 00 0001
00000060 87 0F 10 9B 63 92 AD 1E 7E 71 F1 0E A5 8B 3C F6 ‡ ›c’ ~qñ ¥‹
00000080 D0 0B 97 40 BB 74 09 5D 12 63 8D 7F 58 42 09 4C Ã￾ —@»t ] c XB L
00000090 B6 E3 5A AD F9 05 E5 C6 60 33 D3 EF 7B AB 7D E6 ¶ãZù åÆ`3Óï{«}æ
000000A0 BD 44 84 09 02 46 DA 8C A6 83 E0 84 71 3A 12 1F ½D„ FÚŒ¦ƒà„q:

000000B0 06 74 36 87 F9 E9 B9 4C 35 9C 37 74 56 F3 22 16 t6‡ùé¹L5œ7tVó"

I tried to use tools that supports debug pkg to extract the data, but none of the tools I tried worked. ungpkg crashes after creating a new folder. psn_package_npdrm complains about file being corrupted. pkgview says array out of bound...

Anyone can give any pointers on what I could try next?

Thanks in advance.

EDIT: formatting

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