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QUOTE said:The checksums in the blockmap/journal entries work as follows:
each byte is the checksum of an encrypted 0x200 bytes large block
to calculate the checksum, a CRC16 of the block (with starting value 0xFFFF) is calculated, and the two bytes of the CRC16 are XORed together to produce the 8bit checksum
ichichfly said:May it is a crc 16 with a xor or something of both bytes.
I think this is the end for this.
since there are 1000 of ways the checkbyte can be calculated
lazymarek said:news at http://www.3dbrew.org/wiki/Savegames:
QUOTEThe checksums in the blockmap/journal entries work as follows:
each byte is the checksum of an encrypted 0x200 bytes large block
to calculate the checksum, a CRC16 of the block (with starting value 0xFFFF) is calculated, and the two bytes of the CRC16 are XORed together to produce the 8bit checksum
haha, niceQUOTE said:omg my gess was right (not good english but right). I thought there are 1000 of possible ways and it is not worth testing omg omg omg
ron975 said:So we know how to calculate the checksums now?
QUOTE said:I think 3 are still missing
2 at the start of the hash block and the one in the DIFI
but the 3ds may don't check them.
Mega-Mario said:Why would Nintendo put in checksums/hashes and not verify them? Such a mistake is rather something Sony would do
And don't forget, even if we find all the checksums/hashes, we still can't have useful exploits! We need knowledge of the hardware first!
Immortal_no1 said:I think i'm overlooking something, i've been through this the last few days and didn't come up with anything, i didn't try this starting 0xFFFF part which must make the difference.... but i can't create the CRC value....
So here's some Data:
a 0x200 byte block that should generate the the value 0x48. Ichi you or someone else please explain the process to generate the CRC.
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
I'll add this to the app asap, as soon as i gain the understanding of what is being said.
What is the Polynomial value used?
silentblue1987 said:You have full permission to shoot me down as necessary but I have a question.
Is it possible that the system is based on unix like coding?
I'm basing this on the previous posts with the plaintext parts.
In unix/linux hidden files are indicated by ".foldername" and ".filename"