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 = Signature.from_bytes(secure_random(64))
sig2 = Signature.from_bytes(secure_random(64))
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_signature_rs_serialization():
privkey = UmbralPrivateKey.gen_key()
message = b"attack at dawn"
der_sig_bytes = ecdsa_sign(message, privkey)
signature_from_der = Signature.from_bytes(der_sig_bytes, der_encoded=True)
rs_sig_bytes = bytes(signature_from_der)
assert len(rs_sig_bytes) == 64
signature_from_rs = Signature.from_bytes(rs_sig_bytes, der_encoded=False)
assert signature_from_rs == signature_from_der
assert signature_from_rs == der_sig_bytes
assert signature_from_rs.verify(message, privkey.get_pubkey())
def test_split_signature_from_arbitrary_bytes():
how_many_bytes = 10
signature = Signature.from_bytes(secure_random(64))
some_bytes = secure_random(how_many_bytes)
splitter = BytestringSplitter(Signature, (bytes, how_many_bytes))
rebuilt_signature, rebuilt_bytes = splitter(signature + some_bytes)
def sign(self, message: bytes) -> bytes:
"""
Signs a hashed message and returns a signature.
:param message: The message to sign
:return: Signature in bytes
"""
signature_der_bytes = API.ecdsa_sign(message, self._privkey)
return Signature.from_bytes(signature_der_bytes, der_encoded=True)
def test_trying_to_extract_too_many_bytes_raises_typeerror():
how_many_bytes = 10
too_many_bytes = 11
signature = Signature.from_bytes(secure_random(64))
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 test_signature_can_verify():
privkey = UmbralPrivateKey.gen_key()
message = b"attack at dawn"
der_sig_bytes = ecdsa_sign(message, privkey)
signature = Signature.from_bytes(der_sig_bytes, der_encoded=True)
assert signature.verify(message, privkey.get_pubkey())