def test_sign_invalid_hash(self) -> None:
key = CBitcoinKey('5KJvsngHeMpm884wtkJNzQGaCErckhHJBGFsvd3VyK5qMZXj3hS')
with self.assertRaises(TypeError):
key.sign('0' * 32) # type: ignore
hash = b'\x00' * 32
with self.assertRaises(ValueError):
key.sign(hash[0:-2])
def test_sign(self) -> None:
key = CBitcoinKey('5KJvsngHeMpm884wtkJNzQGaCErckhHJBGFsvd3VyK5qMZXj3hS')
hash = b'\x00' * 32
sig = key.sign(hash)
# Check a valid signature
self.assertTrue(key.pub.verify(hash, sig))
self.assertTrue(IsLowDERSignature(sig))
# Check that invalid hash returns false
self.assertFalse(key.pub.verify(b'\xFF'*32, sig))
# Check that invalid signature returns false.
#
# Note the one-in-four-billion chance of a false positive :)
self.assertFalse(key.pub.verify(hash, sig[0:-4] + b'\x00\x00\x00\x00'))