def _generate_ephemeral_key(self) -> None:
"""
Generate a new ephemeral key if the key was not already set.
:return: None
"""
if self.ephemeral_key is not None:
return
chosen_suite = CipherSuite(self.cipher_suite)
if chosen_suite.dh_curve in [
CoseEllipticCurves.X25519, CoseEllipticCurves.X448
]:
self.ephemeral_key = OKP.generate_key(
CoseAlgorithms.DIRECT,
curve_type=chosen_suite.dh_curve,
key_ops=KeyOps.SIGN)
else:
self.ephemeral_key = EC2.generate_key(
CoseAlgorithms.DIRECT,
curve_type=chosen_suite.dh_curve,
key_ops=KeyOps.SIGN)
def test_okp_key_generation():
key = OKP.generate_key(CoseAlgorithms.EDDSA, KeyOps.SIGN,
CoseEllipticCurves.X25519)
assert isinstance(key, OKP)