def decrypt(self, key: SymmetricKey, alg: Optional['CoseAlgorithms'] = None) -> bytes:
""" Key unwrapping. """
if key is None:
raise CoseIllegalKeyType("COSE Key cannot be None")
return key.key_unwrap(self.payload, alg=alg)
def test_symmetric_key_wrap(kid, alg, key_ops, base_iv, k, pl, algo, ct):
key = SymmetricKey(kid=kid, alg=alg, key_ops=key_ops, base_iv=base_iv, k=k)
assert ct == key.key_wrap(pl, algo)
# switch to another key operation
key.key_ops = KeyOps.UNWRAP
assert pl == key.key_unwrap(ct, algo)