djmarcel
September 3rd, 2003, 11:53 AM
I need help to try a make a operation to get a key, the opertion is it: A PNZ has an extra leading 4 bytes. This is the "key shifter." The rest of the file is the encrypted PNG data.
* The key shifter is in little endian order (intel) 0EEB = EB 0E
* Perform MOD division on the number with offset 0x400 to get the key offset.
* To encrypt: each bit is reversed (10011110 --> 01111001) and then XOR'ed with the key.
the operation is for make it that the pnz files changes in a png files and can do make a changes into file.
* The key shifter is in little endian order (intel) 0EEB = EB 0E
* Perform MOD division on the number with offset 0x400 to get the key offset.
* To encrypt: each bit is reversed (10011110 --> 01111001) and then XOR'ed with the key.
the operation is for make it that the pnz files changes in a png files and can do make a changes into file.