def test_split_two_signatures():
"""
We make two random Signatures and concat them. Then split them and show that we got the proper result.
"""
sig1, sig2 = Signature(secure_random(65)), Signature(secure_random(65))
sigs_concatted = sig1 + sig2
two_signature_splitter = BytestringSplitter(Signature, Signature)
rebuilt_sig1, rebuilt_sig2 = two_signature_splitter(sigs_concatted)
assert (sig1, sig2) == (rebuilt_sig1, rebuilt_sig2)
def test_split_signature_from_arbitrary_bytes():
how_many_bytes = 10
signature = Signature(secure_random(65))
some_bytes = secure_random(how_many_bytes)
splitter = BytestringSplitter(Signature, (bytes, how_many_bytes))
rebuilt_signature, rebuilt_bytes = splitter(signature + some_bytes)
def test_trying_to_extract_too_many_bytes_raises_typeerror():
how_many_bytes = 10
too_many_bytes = 11
signature = Signature(secure_random(65))
some_bytes = secure_random(how_many_bytes)
splitter = BytestringSplitter(Signature, (bytes, too_many_bytes))
with pytest.raises(ValueError):
rebuilt_signature, rebuilt_bytes = splitter(signature + some_bytes, return_remainder=True)
def sign(self, *messages):
"""
Signs a message and returns a signature with the keccak hash.
:param Iterable messages: Messages to sign in an iterable of bytes
:rtype: bytestring
:return: Signature of message
"""
try:
sig_keypair = self._power_ups[SigningPower]
except KeyError as e:
raise NoSigningPower(e)
msg_digest = b"".join(API.keccak_digest(m) for m in messages)
return Signature(sig_keypair.sign(msg_digest))