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==== Jak X: Combat Racing ====
==== Jak X: Combat Racing ====
See also [https://jakanddaxter.fandom.com/wiki/Bugs Jak and Daxter games bugs on jakanddaxter.fandom.com].


===== Custom code injection via patch.bin file =====
===== Custom code injection via patch.bin file =====


The game savedata contains a file named patch.bin whose aim is to be loaded at address 0x00C00000 then executed. There is no protection except a CRC32 checksum (with 0xEDB88320 polynomial) and a sort of obfuscated (yet to be understood) format for the patch data. CelesteBlue's hypothesis are:
The game savedata contains a file named patch.bin whose aim is to be loaded at address 0x00C00000 then executed. There is no protection except a CRC32 checksum (with 0xEDB88320 polynomial) and a sort of obfuscated (yet to be understood) format for the patch data.
* some simple but undocumented obfuscation (xor, byte swap, etc.)
* some compression (LZO/miniLZO as in DGO/CGO files, ...)
* some encryption (des/des_ede/desx/rc2/rc5/rc5_64/rc6/gencrypt algorithm with cbc/ecb/cbc_interleaved/cfb/cfb_pipelined/ofb/ofb_pipelined mode and nopad/pad/stream choice of padding)
* some [[DNAS]] check by connecting to SCE remote servers


The patch.bin file must contain a little-endian header of 16 bytes followed by patch data of arbitrary size.
The patch.bin file must contain a little-endian header of 16 bytes followed by patch data of arbitrary size.
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