Need some help with the ULL encoding

[chrissdegrece]

After trying for many hours with debugging a3ull I noticed the following:

There is a "code phrase" which is used to decode the ULL files.

That is:

    #### For our everlasting love. From 24 Dec, 1994.###        Ooops. Who are you? You are not supposed to read this message. Please close this, Enjoy our game A3, and always be happy~!

The "decryption" part is starting from the end of the file, a few bytes before the end to be exact.

Then the file is read byte by byte and it goes something like this

current = getbyte from file
previous = current - 1
xorkey1 = substring(<code phrase>,ASCIICODE(previous),1)
result1 = xor previous,xorkey1
xorkey2 = filesize AND 0FF
result2 = xor result1, xorkey2
..........
..........
And I lose it from here

Anyone willing to spend some time in understanding how the stupid ULL works and knows how to use a debugger, let me know.

P.S.
DO NOT ask me how a debugger works, if you know how to use it then contact me.

[MentaL]

[[GM]: Glenox]

try to search please....

[chrissdegrece]

Search where?

[chrissdegrece]

Finally I made it:

http://a3mmorpg.wikia.com/wiki/How_ULL_files_work

[onyourrisk]

Congo for this :) you really done well .