def test_symmetric_key_derivation(kid, alg, key_ops, base_iv, k, salt, algo,
ctx_alg, u, v, pub, priv, context, cek):
key = SymmetricKey(kid=kid, alg=alg, key_ops=key_ops, base_iv=base_iv, k=k)
ctx = CoseKDFContext(ctx_alg, u, v, pub, priv)
assert ctx.encode() == context
assert key.hmac_key_derivation(ctx, algo, salt) == cek
def _(cls,
private_key: SymmetricKey,
public_key=None,
alg: Optional['CoseAlgorithms'] = None,
context: 'CoseKDFContext' = None,
curve=None,
salt: bytes = b'',
expose_secret: bool = False):
_ = public_key
_ = curve
kek = private_key.hmac_key_derivation(context, alg, salt)
if expose_secret:
return private_key.private_bytes, kek
else:
return kek