1 files changed, 98 insertions, 0 deletions
diff --git a/src/leap/soledad/common/crypto.py b/src/leap/soledad/common/crypto.py
new file mode 100644
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+++ b/src/leap/soledad/common/crypto.py
@@ -0,0 +1,98 @@
+# -*- 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'