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John-K / pspdecrypt

Simple tool to decrypt PSP binaries
GNU General Public License v3.0
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Add Vita PSP-Emulator Keys #44

Closed Spenon-dev closed 2 years ago

Spenon-dev commented 2 years ago

Keys to decrypt all firmware prx files of the Vita PSP emulator found in pcff.elf. Verified and tested against all retail firmwares. Should also decrypt all prx files from DEX/TOOL firmwares but not all have been tested.

Closes https://github.com/John-K/pspdecrypt/issues/40

LiEnby commented 2 years ago

i cant seem to decrypt the os0:kd/pcbc.skprx, which is loaded right after pcff.skprx, (if i had to guess id think its probably the IPL ..?) tried?: pspdecrypt -i psvita.ipl --version 661 -o psvita.ipl.dec (where psvita.ipl is segment 1 from pcbc.elf)

actually, i cant decrypt IPL from any psp firmware with this?

Spenon-dev commented 2 years ago

i cant seem to decrypt the os0:kd/pcbc.skprx, which is loaded right after pcff.skprx, (if i had to guess id think its probably the IPL ..?) tried?: pspdecrypt -i psvita.ipl --version 661 -o psvita.ipl.dec (where psvita.ipl is segment 1 from pcbc.elf)

actually, i cant decrypt IPL from any psp firmware with this?

Sorry for the late reply, Yes os0:kd/pcbc.skprx is the IPL. The encryption is unique to the Vita and pspdecrypt does not support it at the moment. Theres a way to decrypt it however.

1) Strip the first 304 Bytes of the pcbc.skprx file.

2) Then use this tool to decrypt it. https://github.com/TheOfficialFloW/VitaMips/tree/master/pcbctool

The XOR key in pcbctool must match the firmware version. You can find the keys here https://playstationdev.wiki/psvitadevwiki/index.php/Keys#ePSP_IPL_Xor_Keys

This functionality could of course be merged into pspdecrypt but I don't know if it is worth the extra complexity for this niche case.