def construct(self, tup):
"""Construct a ECDSA key from a tuple of valid ECDSA components.
The curve T must be valid.
:Parameters:
tup : tuple
A tuple of long integers, with 1 or 2 items
in the following order:
1. Public key (*Q*).
2. Private key (*d*). Optional.
:Return: A ECDSA key object (`_ECDSAobj`).
"""
key = _ECDSA.construct(*tup)
return _ECDSAobj(self, key)
def _generate(self, T, randfunc=None, progress_func=None):
rf = self._get_randfunc(randfunc)
obj = _ECDSA.generate_py(T, rf, progress_func)
key = _ECDSA.construct(obj.Q, obj.d)
return _ECDSAobj(self, key)
