As some of you might already know, I haveve been developing a JJ2 add-on for mIRC.
Now I'm trying to introduce the possibility of joining private servers provided the password.
However, there is a problem I cannot overcome. In oder to check the whether the password is correct or not, jazz sends one UDP packet which comprehends not only the password the user writes but also a byte which varies according to the length of the password, a byte whose value is always (?) x0a AND two bytes whose value depend upon the password but not in some obvious way. Examples:

Pass Byte1 Byte2
a 6d 85
b 6e 86
c 6f 87
1 3d 55
2 3e 56
aa CF 5B
ab d0 5c
ca d1 5f
cb d2 60
bb d1 5e
aaa 36 94
baa 37 97
caa 38 9a
bda 3a 9f
aaaa 98 35
baaa 99 39

Some regularities are easy to deprehend, for instance:
1. It takes into account the ASCII values of each character:
For 'a' (CHR 97), since x6a (1st check byte) = 109 --> 109 - 97 = _12_
For '1' (CHR 49), since x3d = 61 --> 61 - 49 = _12_

Sth similar occurs to the second byte.
2. If we change a byte into the next value (e.g.: an 'a' (x6d) into a 'b' (x6e), the first check byte increments 1 and the second increments according to their position (for the last +1, for the one before the last +2, etc.).

However, this is not enough to comprehend the values those two bytes assume, and I do need to know that so I can reproduce it for any password. Because, unless those two bytes have the correct value the JJ2 server ignores the packet.

So... Help would be welcome.

Thanks in advance,
Cataphract