code: def _legacy_pubs(buf):
      
      leftover = buf.read()
      if leftover:
          log.warning('skipping leftover: %r', leftover)
      code = util.pack('B', msg_code('SSH_AGENT_RSA_IDENTITIES_ANSWER'))
      num = util.pack('L', 0)  # no SSH v1 keys
      return util.frame(code, num)
docs: SSH v1 public keys are not supported.