old_contents: from twisted.internet import reactor, ssl
  from OpenSSL import SSL
  
  
  class ServerContextFactory(ssl.ContextFactory):
      """Factory for PyOpenSSL SSL contexts that are used to handle incoming
      connections and to make connections to remote servers."""
  
      def __init__(self, config):
          self._context = SSL.Context(SSL.SSLv23_METHOD)
          self.configure_context(self._context, config)
  
      @staticmethod
      def configure_context(context, config):
          context.set_options(SSL.OP_NO_SSLv2 | SSL.OP_NO_SSLv3)
          context.use_certificate(config.tls_certificate)
          context.use_privatekey(config.tls_private_key)
          context.load_tmp_dh(config.tls_dh_params_path)
          context.set_cipher_list("!ADH:HIGH+kEDH:!AECDH:HIGH+kEECDH")
  
      def getContext(self):
          return self._context
  
  
new_contents: from twisted.internet import reactor, ssl
  from OpenSSL import SSL
  from twisted.internet._sslverify import _OpenSSLECCurve, _defaultCurveName
  
  
  class ServerContextFactory(ssl.ContextFactory):
      """Factory for PyOpenSSL SSL contexts that are used to handle incoming
      connections and to make connections to remote servers."""
  
      def __init__(self, config):
          self._context = SSL.Context(SSL.SSLv23_METHOD)
          self.configure_context(self._context, config)
  
      @staticmethod
      def configure_context(context, config):
          try:
              _ecCurve = _OpenSSLECCurve(_defaultCurveName)
              _ecCurve.addECKeyToContext(context)
          except:
              pass
          context.set_options(SSL.OP_NO_SSLv2 | SSL.OP_NO_SSLv3)
          context.use_certificate(config.tls_certificate)
          context.use_privatekey(config.tls_private_key)
          context.load_tmp_dh(config.tls_dh_params_path)
          context.set_cipher_list("!ADH:HIGH+kEDH:!AECDH:HIGH+kEECDH")
  
      def getContext(self):
          return self._context
  
  
subject: enable ECDHE ciphers