def step1(self, pin):
context = SRPContext(<EOL>'<STR_LIT>', str(pin),<EOL>prime=constants.PRIME_3072,<EOL>generator=constants.PRIME_3072_GEN,<EOL>hash_func=hashlib.sha512)<EOL>self._session = SRPClientSession(<EOL>context, binascii.hexlify(self._auth_private).decode())<EOL>
First pairing step.