[research]Prototype 2 save CRC(ps3)

[chaoszage]

I read through whole forum and it seems xbox save does not have a crc protection but ps3 save has one,I looked through the game elf(converted from eboot.bin) and here's what I found:

I found the CRC32 table and it is the standard 1,

1st part till the last part
00 00 00 00 04 C1 1D B7 ...(until)... B5 36 5D 03 B1 F7 40 B4

pic below shows this CRCtable is loaded from a function and perform CRC32

pic below saying this CRC32 function is being called several times,and you can see the CRC.bin


weird is why CRC32 result isn't matched,initial value is set..? or there is a particular xor value of final result..? I tried BSD checksum finder,it does not matched no matter what.(bsd crc32 checksum is no problem as I can get the right checksum for other games)

but I can tell

checksum address in CRC.bin: 0x00-0x03

Calculation Range in USERDATA.BIN
Start: 0x00
End: end of file

Files needed are in HERE
contains:
-Prototype 2 decrypted saves(1 is savedata and 1 is profile data),just open with Hex editor to view the data
-Prototype 2 ELF(like xbox xex),just open with IDA Pro to view the data

I need pros help me out about this unknown checksum type. Thanks in advance :)

PS:I do believe Prototype 1 is using the same CRC type.

[matthewjohn]

I read through whole forum and it seems xbox save does not have a crc protection but ps3 save has one,I looked through the game elf(converted from eboot.bin) and here's what I found:

I found the CRC32 table and it is the standard 1,

1st part till the last part
00 00 00 00 04 C1 1D B7 ...(until)... B5 36 5D 03 B1 F7 40 B4

pic below shows this CRCtable is loaded from a function and perform CRC32

pic below saying this CRC32 function is being called several times,and you can see the CRC.bin


weird is why CRC32 result isn't matched,initial value is set..? or there is a particular xor value of final result..? I tried BSD checksum finder,it does not matched no matter what.(bsd crc32 checksum is no problem as I can get the right checksum for other games)

but I can tell

checksum address in CRC.bin: 0x00-0x03

Calculation Range in USERDATA.BIN
Start: 0x00
End: end of file

Files needed are in HERE
contains:
-Prototype 2 decrypted saves(1 is savedata and 1 is profile data),just open with Hex editor to view the data
-Prototype 2 ELF(like xbox xex),just open with IDA Pro to view the data

I need pros help me out about this unknown checksum type. Thanks in advance :)

PS:I do believe Prototype 1 is using the same CRC type.

Message amany he really good with checksums mate he fix all my checksum prblems :)

[chaoszage]

Message amany he really good with checksums mate he fix all my checksum prblems :)

thanks for your reply,I will contact amany right now! :)

PS:anamy liked your post,I assume he/she already read this post..? :D

[matthewjohn]

Lol I can see that lol


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[amany]

after look little save i see on USERDATA you have CRC32big hash start at 0x8 & writes at 0x0

[amany]

i can make a fix

[chaoszage]

amany , here's another decrypted save for comparison if you want.

Download Link

after look little save i see on USERDATA you have CRC32big hash start at 0x8 & writes at 0x0

I could be wrong,if I compare to another decrypted save,address from 0x0 till 0xF is identical,the only difference is the one in CRC.bin

i can make a fix

I am looking forward to this and thanks for taking time by looking at it :D

offset 0x00 : block size
offset 0x08 : CRC32Big hash..? I checked using game genie,this offset does not change at all after modding :(

[amany]

ok i will try on crc.BIn it realy a simple hash for fixe