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ecc.py: properly handle point at infinity

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This commit is contained in:
SomberNight
2018-06-16 06:34:03 +02:00
parent 1a8e8bc047
commit 59c1d03f01
2 changed files with 53 additions and 6 deletions
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26
lib/tests/test_bitcoin.py
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@@ -125,6 +125,32 @@ class Test_bitcoin(SequentialTestCase):
#print signature
eck.verify_message_for_address(signature, message)
@needs_test_with_all_ecc_implementations
def test_ecc_sanity(self):
G = ecc.generator()
n = G.order()
self.assertEqual(ecc.CURVE_ORDER, n)
inf = n * G
self.assertEqual(ecc.point_at_infinity(), inf)
self.assertTrue(inf.is_at_infinity())
self.assertFalse(G.is_at_infinity())
self.assertEqual(11 * G, 7 * G + 4 * G)
self.assertEqual((n + 2) * G, 2 * G)
self.assertEqual((n - 2) * G, -2 * G)
A = (n - 2) * G
B = (n - 1) * G
C = n * G
D = (n + 1) * G
self.assertFalse(A.is_at_infinity())
self.assertFalse(B.is_at_infinity())
self.assertTrue(C.is_at_infinity())
self.assertTrue((C * 5).is_at_infinity())
self.assertFalse(D.is_at_infinity())
self.assertEqual(inf, C)
self.assertEqual(inf, A + 2 * G)
self.assertEqual(inf, D + (-1) * G)
self.assertNotEqual(A, B)
@needs_test_with_all_ecc_implementations
def test_msg_signing(self):
msg1 = b'Chancellor on brink of second bailout for banks'