xiaomi-purifier-reset-command.py

import sys
import hashlib

# Usage: xiaomi-purifier-pwd.py 04A03CAA1E7080
def getpwd(uid):
    uid = bytearray.fromhex(uid)
    h = bytearray.fromhex(hashlib.sha1(uid).hexdigest())
    pwd = ""
    pwd += "%02X" % h[h[0] % 20]
    pwd += "%02X" % h[(h[0]+5) % 20]
    pwd += "%02X" % h[(h[0]+13) % 20]
    pwd += "%02X" % h[(h[0]+17) % 20]
    return pwd

assert getpwd("04A03CAA1E7080") == "CD91AFCC"
assert getpwd("04112233445566") == "EC9805C8"
print("PWD:", getpwd(sys.argv[1]))

command = "1B%s,3008,A20800000000" % getpwd(sys.argv[1])
print("CMD:", command)