pwgen-asus.py does not generate the correct rescue password for Asus laptop with current date

[witchole]

The python script pwgen-asus.py does not generate the correct rescue password for an Asus ZX553VD-DM640T laptop where the system date is current (2021/12/nn). It does show the BIOS date and "Enter Rescue password" when Alt-R is pressed, but always reports "invalid password".

1. Is it possible that this algorithm is wrong for recent dates, or could this Asus laptop have a different algorithm altogether?
2. The program can be massively simplified with a hard-coded table, as shown below. Dogbert presumably wants to show that s/he knows the original Asus algorithm.

def calculatePassword(date):
    table = ['B', 'L', 'D', 'D', 'B', 'A', '4', 'H',
             '0', 'O', 'L', 'B', '0', 'L', 'B', '2',
             '1', '1', 'C', '9', 'B', 'O', 'A', 'A',
             'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A']
    chksum = int(date.replace("-", ""), 16)
    password = ""
    for i in range(8):
        chksum = 33676 * chksum + 12345
        index = (chksum >> 16) & 31
        password += table[index]
    return password

[witchole]

According to a comment on Dogbert's Blog ASUS created a new BIOS password algorithm that seems to affect systems from around 2014.

I wonder whether the solution "simply" requires a different set of the 3 seed values - currently (11,19,6) - in the initTable() function, or maybe different values to replace 33676 and 12345?

[dogbert]

The vendor might have changed the hashing algorithm - feel free to reverse-engineer it yourself.

Support for EFI bios binaries in various tools (Ghidra and so on) has been vastly improved compared to when I took a shot at this. Hence, it shouldn't be that hard anymore.