def test_encode_read_length(self):
length_encodings = (
(0, "00"),
(1, "01"),
(38, "26"),
(127, "7f"),
(129, "8181"),
(201, "81c9"),
(65535, "82ffff"),
(65536, "83010000")
)
for value, enc in length_encodings:
self.assertEqual(types.encode_length(value).encode("hex"), enc)
self.assertEqual(types.read_length(enc.decode("hex")), (value, ""))
# Test that the reader stops after the specified number of bytes.
longer = enc + "00"
self.assertEqual(types.read_length(longer.decode("hex")),
(value, "\x00"))
longer = enc + "ff"
self.assertEqual(types.read_length(longer.decode("hex")),
(value, "\xff"))
# And test that it complains when there are not enough bytes.
shorter = enc[:-2]
self.assertRaises(error.ASN1Error,
types.read_length, shorter.decode("hex"))
def test_encode_read_length(self):
length_encodings = (
(0, "00"),
(1, "01"),
(38, "26"),
(127, "7f"),
(129, "8181"),
(201, "81c9"),
(65535, "82ffff"),
(65536, "83010000")
)
for value, enc in length_encodings:
self.assertEqual(types.encode_length(value).encode("hex"), enc)
self.assertEqual(types.read_length(enc.decode("hex")), (value, ""))
# Test that the reader stops after the specified number of bytes.
longer = enc + "00"
self.assertEqual(types.read_length(longer.decode("hex")),
(value, "\x00"))
longer = enc + "ff"
self.assertEqual(types.read_length(longer.decode("hex")),
(value, "\xff"))
# And test that it complains when there are not enough bytes.
shorter = enc[:-2]
self.assertRaises(error.ASN1Error,
types.read_length, shorter.decode("hex"))
def test_read_indefinite_length(self):
indef_length = "80".decode("hex")
self.assertRaises(error.ASN1Error, types.read_length, indef_length)
self.assertEqual(types.read_length(indef_length, strict=False),
(-1, ""))
self.assertEqual(types.read_length(indef_length + "hello", strict=False),
(-1, "hello"))
def test_read_indefinite_length(self):
indef_length = "80".decode("hex")
self.assertRaises(error.ASN1Error, types.read_length, indef_length)
self.assertEqual(types.read_length(indef_length, strict=False),
(-1, ""))
self.assertEqual(types.read_length(indef_length + "hello", strict=False),
(-1, "hello"))