def METHOD_NAME(self):
    # DES3 checksum
    kb = h('7A25DF8992296DCEDA0E135BC4046E2375B3C14C98FBC162')
    keyusage = 2
    plain = b'six seven'
    cksum = h('0EEFC9C3E049AABC1BA5C401677D9AB699082BB4')
    k = Key(Enctype.DES3, kb)
    verify_checksum(Cksumtype.SHA1_DES3, k, keyusage, plain, cksum)