def CalculChecksum(adresseChecksum,hexSauvegarde):

    adresseChecksum *= 2

    r = bin(0xFFFF)[2:].zfill(8)

    len = 4336

    while len > 0:

        len -= 1

        t = hexSauvegarde[adresseChecksum:adresseChecksum+2]

        adresseChecksum += 2

        t_bin = bin(int(t,16))[2:].zfill(8)+'00000000'

        r = bin(int(r,2) ^ int(t_bin,2))[2:].zfill(16)

        for d in range(8):

            if r[:1] == '1':

                r = r+'0'

                r = bin(int(r,2) ^ int('00001000000100001',2))[2:].zfill(17)

                r = r[1:]

            else:

                r = r+'0'

                r = r[1:]

    r = bin(int(r,2) ^ int('1111111111111111',2))[2:].zfill(16)

    r = hex(int(r,2))[2:].zfill(4)

    return(r)