in kinto-remote-settings/src/kinto_remote_settings/signer/backends/local_ecdsa.py [0:0]
def __init__(self, private_key=None, public_key=None):
if private_key is None and public_key is None:
msg = "Please, specify either a private_key or public_key location."
raise ValueError(msg)
self.private_key = private_key
self.public_key = public_key