old_contents: # Copyright (C) 2016 Virgil Security Inc.
  #
  # Lead Maintainer: Virgil Security Inc. <support@virgilsecurity.com>
  #
  # All rights reserved.
  #
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions are
  # met:
  #
  #     (1) Redistributions of source code must retain the above copyright
  #     notice, this list of conditions and the following disclaimer.
  #
  #     (2) Redistributions in binary form must reproduce the above copyright
  #     notice, this list of conditions and the following disclaimer in
  #     the documentation and/or other materials provided with the
  #     distribution.
  #
  #     (3) Neither the name of the copyright holder nor the names of its
  #     contributors may be used to endorse or promote products derived from
  #     this software without specific prior written permission.
  #
  # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR
  # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  # DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  # INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  # (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  # SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  # STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  # IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  # POSSIBILITY OF SUCH DAMAGE.
  import abc
  
  
  class KeyStorage(object):
      """Abstract for classes that represent
          a cryptographic keys storage containers."""
      __metaclass__ = abc.ABCMeta
  
      @abc.abstractclassmethod
      def store(self, key_name, key_value):
          # type: (str, bytes) -> None
          """Stores the key to the given alias."""
          raise NotImplementedError()
  
      @abc.abstractclassmethod
      def load(self, key_name):
          # type: (str) -> bytes
          """The requested key, or None if the given alias does not exist or does
          not identify a key-related entry."""
          raise NotImplementedError()
  
      @abc.abstractclassmethod
      def delete(self, key_name):
          # type: (str) -> None
          """Checks if the given alias exists in this keystorage."""
          raise NotImplementedError()
  
new_contents: # Copyright (C) 2016 Virgil Security Inc.
  #
  # Lead Maintainer: Virgil Security Inc. <support@virgilsecurity.com>
  #
  # All rights reserved.
  #
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions are
  # met:
  #
  #     (1) Redistributions of source code must retain the above copyright
  #     notice, this list of conditions and the following disclaimer.
  #
  #     (2) Redistributions in binary form must reproduce the above copyright
  #     notice, this list of conditions and the following disclaimer in
  #     the documentation and/or other materials provided with the
  #     distribution.
  #
  #     (3) Neither the name of the copyright holder nor the names of its
  #     contributors may be used to endorse or promote products derived from
  #     this software without specific prior written permission.
  #
  # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR
  # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  # DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  # INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  # (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  # SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  # STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  # IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  # POSSIBILITY OF SUCH DAMAGE.
  from abc import abstractmethod
  from abc import ABCMeta
  
  
  class KeyStorage(object):
      """Abstract for classes that represent
          a cryptographic keys storage containers."""
      __metaclass__ = ABCMeta
  
      @abstractmethod
      def store(self, key_name, key_value):
          # type: (str, bytes) -> None
          """Stores the key to the given alias."""
          raise NotImplementedError()
  
      @abstractmethod
      def load(self, key_name):
          # type: (str) -> bytes
          """The requested key, or None if the given alias does not exist or does
          not identify a key-related entry."""
          raise NotImplementedError()
  
      @abstractmethod
      def delete(self, key_name):
          # type: (str) -> None
          """Checks if the given alias exists in this keystorage."""
          raise NotImplementedError()
  
subject: Fix support for python 2.7