def test_signature_can_verify():
privkey = UmbralPrivateKey.gen_key()
message = b"peace at dawn"
der_sig_bytes = ecdsa_sign(message, privkey)
assert verify_ecdsa(message, der_sig_bytes, privkey.get_pubkey())
signature = Signature.from_bytes(der_sig_bytes, der_encoded=True)
assert signature.verify(message, privkey.get_pubkey())
def test_actor_with_signing_power_can_sign():
"""
However, simply giving that character a PowerUp bestows the power to sign.
Instead of having a Character verify the signature, we'll use the lower level API.
"""
message = b"Llamas."
signer = Character(crypto_power_ups=[SigningPower], is_me=True,
start_learning_now=False, federated_only=True)
stamp_of_the_signer = signer.stamp
# We can use the signer's stamp to sign a message (since the signer is_me)...
signature = stamp_of_the_signer(message)
# ...or to get the signer's public key for verification purposes.
# (note: we use the private _der_encoded_bytes here to test directly against the API, instead of Character)
verification = api.verify_ecdsa(message, signature._der_encoded_bytes(),
stamp_of_the_signer.as_umbral_pubkey())
assert verification is True