The download (a DRM BB install package) is installed by the game's boot program only when it's
started with -i, which nothing does any more. PPSSPP now installs it itself when the game boots, the
way psheet does. Unpacking the package needs only known keys: a fixed one from psheet, and the
secure install ID, which comes out of the package's MAC.
The module inside is a type 3 PRX whose first step is encrypted for KIRK command 2, with a key
that isn't known. Command 2's result is the same on every PSP, though, so it is now stored for the
EU and US modules (taken on a PSP through sceMesgIns_driver_D062B635, the call the install makes,
and cross-checked against an install). The type 3 decrypt uses it in place of that step, so the
installed module needs no Fuse ID.
--re-decrypt also takes such a package now.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
- Fixes#12343
Killzone: Liberation's Chapter 5 DLC is an installer that the PSP turns
into ms0:/PSP/GAME/<id>/KZL.PRX, which the game loads with
sceKernelLoadModuleDNAS. That file is a PGD around a type 3 PRX (decrypt
mode 18), both keyed to the console that installed it. Its Fuse ID
gives everything needed:
- libkirk: the per-console key derivation, and KIRK commands 3, 5 and 8
built on it (KIRK ROM per uofw, key mesh per psdevwiki).
- PrxDecrypter: type 3, which is type 5 with the first step through
KIRK command 3 (JPCSP's PRX.java), and the DNAS PGD unwrap.
- sceKernelLoadModuleDNAS uses the new FuseID setting (or --fuse-id).
Without one, or with the wrong one, the game falls back to its stock
module and an OSD message says why.
- Headless --re-decrypt takes --re-decrypt-key and --fuse-id, to decrypt
such a file offline.
Verified with a patch installed on a real PSP: the v1.20 module loads,
starts and reads CHAPTER5.BIN. Type 5 output is unchanged (an NPJH50521
PBOOT.PBP decrypts byte-identically). How to install one over PSPLink is
in docs/dnas-patches.md.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
--re-decrypt runs pspDecryptPRX() over a file and unpacks the KL4E/KL3E
stream behind it. This opens up flash0:/kd/resource/*.img, the images the
Media Engine actually runs: they are ordinary tagged containers (tag
862648D1, which PrxDecrypter already has a key for) with the ~PSP
signature blanked, so the normal module loader never touches them.
--re-raw-base analyzes --re-module as a flat code image at a given
address rather than as a PRX. The decrypted ME images are raw MIPS with
no ELF around them; the address they were linked for is recoverable from
their own jal targets (0x08300000 for meimg.img).
Also makes PrxDecrypter.h self-contained - PSP_Header is built from _le
types, so it needs Common/Swap.h rather than relying on the includer.
