fios-wep.py

# Calculate the lower 6 bytes of the WEP key, the upper 4 are from the MAC
# address of the router (1801 or 1F90)

def get_key(essid):
    key = sum(int(val, 36) * (36**idx) for idx, val in enumerate(essid))
    return hex(key)

# >>> print get_key("E3X12")
# 0x349fca

# or as a one liner:
print hex(sum(int(val, 36) * (36**idx) for idx, val in enumerate(essid)))