def print_fingerprint(fp: bytes, # Contact's fingerprint
msg: str = '' # Title message
) -> None:
"""Print a formatted message and fingerprint inside the box.
Truncate fingerprint for clean layout with three rows that have
five groups of five numbers. The resulting fingerprint has
249.15 bits of entropy which is more than the symmetric security
of X448.
"""
p_lst = [msg, ''] if msg else []
b10fp = b10encode(fp)[:(3*5*5)]
parts = split_string(b10fp, item_len=(5*5))
p_lst += [' '.join(split_string(p, item_len=5)) for p in parts]
m_print(p_lst, box=True)
def test_b10encode(self):
self.assertEqual(
b10encode(FINGERPRINT_LENGTH * b'a'),
'44046402572626160612103472728795008085361523578694645928734845681441465000289'
)