code: def deserialize(cls, target_class, obj):
          
  
          installation_context = target_class.__new__(target_class)
          private_key_client = security.rsa_key_from_string(
              obj[cls._FIELD_PRIVATE_KEY_CLIENT]
          )
          public_key_client = security.rsa_key_from_string(
              obj[cls._FIELD_PUBLIC_KEY_CLIENT]
          )
          public_key_server = security.rsa_key_from_string(
              obj[cls._FIELD_PUBLIC_KEY_SERVER]
          )
          installation_context.__dict__ = {
              cls._ATTRIBUTE_TOKEN: obj[cls._FIELD_TOKEN],
              cls._ATTRIBUTE_PRIVATE_KEY_CLIENT: private_key_client,
              cls._ATTRIBUTE_PUBLIC_KEY_CLIENT: public_key_client,
              cls._ATTRIBUTE_PUBLIC_KEY_SERVER: public_key_server,
          }
  
          return installation_context
docs: :type target_class: context.InstallationContext|type
          :type obj: dict
  
          :rtype: context.InstallationContext