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+# -*- coding: utf-8 -*-
+# crypto.py
+# Copyright (C) 2013 LEAP
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+
+"""
+Soledad common crypto bits.
+"""
+
+
+#
+# Encryption schemes used for encryption.
+#
+
+class EncryptionSchemes(object):
+
+ """
+ Representation of encryption schemes used to encrypt documents.
+ """
+
+ NONE = 'none'
+ SYMKEY = 'symkey'
+ PUBKEY = 'pubkey'
+
+
+class UnknownEncryptionSchemeError(Exception):
+
+ """
+ Raised when trying to decrypt from unknown encryption schemes.
+ """
+ pass
+
+
+class EncryptionMethods(object):
+
+ """
+ Representation of encryption methods that can be used.
+ """
+
+ AES_256_CTR = 'aes-256-ctr'
+
+
+class UnknownEncryptionMethodError(Exception):
+
+ """
+ Raised when trying to encrypt/decrypt with unknown method.
+ """
+ pass
+
+
+class MacMethods(object):
+
+ """
+ Representation of MAC methods used to authenticate document's contents.
+ """
+
+ HMAC = 'hmac'
+
+
+class UnknownMacMethodError(Exception):
+
+ """
+ Raised when trying to authenticate document's content with unknown MAC
+ mehtod.
+ """
+ pass
+
+
+class WrongMacError(Exception):
+
+ """
+ Raised when failing to authenticate document's contents based on MAC.
+ """
+
+
+#
+# Crypto utilities for a SoledadDocument.
+#
+
+ENC_JSON_KEY = '_enc_json'
+ENC_SCHEME_KEY = '_enc_scheme'
+ENC_METHOD_KEY = '_enc_method'
+ENC_IV_KEY = '_enc_iv'
+MAC_KEY = '_mac'
+MAC_METHOD_KEY = '_mac_method'