auth.py 文件源码

def _hi(data, salt, iterations):
            """A simple implementation of PBKDF2."""
            mac = hmac.HMAC(data, None, sha1)

            def _digest(msg, mac=mac):
                """Get a digest for msg."""
                _mac = mac.copy()
                _mac.update(msg)
                return _mac.digest()

            from_bytes = _from_bytes
            to_bytes = _to_bytes

            _u1 = _digest(salt + b'\x00\x00\x00\x01')
            _ui = from_bytes(_u1, 'big')
            for _ in range(iterations - 1):
                _u1 = _digest(_u1)
                _ui ^= from_bytes(_u1, 'big')
            return to_bytes(_ui, 20, 'big')