Add basic openpgp key handling to Key Manager

1 files changed, 127 insertions, 0 deletions

diff --git a/src/leap/common/keymanager/keys.py b/src/leap/common/keymanager/keys.py
new file mode 100644
index 0000000..13e3c0b
--- /dev/null
+++ b/src/leap/common/keymanager/keys.py
@@ -0,0 +1,127 @@
+# -*- coding: utf-8 -*-
+# keys.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/>.
+
+
+"""
+Abstact key type and wrapper representations.
+"""
+
+
+from abc import ABCMeta, abstractmethod
+
+
+class EncryptionKey(object):
+    """
+    Abstract class for encryption keys.
+
+    A key is "validated" if the nicknym agent has bound the user address to a
+    public key. Nicknym supports three different levels of key validation:
+
+    * Level 3 - path trusted: A path of cryptographic signatures can be traced
+      from a trusted key to the key under evaluation. By default, only the
+      provider key from the user's provider is a "trusted key".
+    * level 2 - provider signed: The key has been signed by a provider key for
+      the same domain, but the provider key is not validated using a trust
+      path (i.e. it is only registered)
+    * level 1 - registered: The key has been encountered and saved, it has no
+      signatures (that are meaningful to the nicknym agent).
+    """
+
+    __metaclass__ = ABCMeta
+
+    def __init__(self, address, key_id=None, fingerprint=None,
+                 key_data=None, length=None, expiry_date=None,
+                 validation=None, first_seen_at=None,
+                 last_audited_at=None):
+        self.address = address
+        self.key_id = key_id
+        self.fingerprint = fingerprint
+        self.key_data = key_data
+        self.length = length
+        self.expiry_date = expiry_date
+        self.validation = validation
+        self.first_seen_at = first_seen_at
+        self.last_audited_at = last_audited_at
+
+    def get_json(self):
+        """
+        Return a JSON string describing this key.
+
+        @return: The JSON string describing this key.
+        @rtype: str
+        """
+        return json.dumps({
+            'address': self.address,
+            'type': str(self.__type__),
+            'key_id': self.key_id,
+            'fingerprint': self.fingerprint,
+            'key_data': self.key_data,
+            'length': self.length,
+            'expiry_date': self.expiry_date,
+            'validation': self.validation,
+            'first_seen_at': self.first_seen_at,
+            'last_audited_at': self.last_audited_at,
+        })
+
+
+#
+# Key wrappers
+#
+
+class KeyTypeWrapper(object):
+    """
+    Abstract class for Key Type Wrappers.
+
+    A wrapper for a certain key type should know how to get and put keys in
+    local storage using Soledad and also how to generate new keys.
+    """
+
+    __metaclass__ = ABCMeta
+
+    @abstractmethod
+    def get_key(self, address):
+        """
+        Get key from local storage.
+
+        @param address: The address bound to the key.
+        @type address: str
+
+        @return: The key bound to C{address}.
+        @rtype: EncryptionKey
+        @raise KeyNotFound: If the key was not found on local storage.
+        """
+
+    @abstractmethod
+    def put_key(self, key):
+        """
+        Put a key in local storage.
+
+        @param key: The key to be stored.
+        @type key: EncryptionKey
+        """
+
+    @abstractmethod
+    def gen_key(self, address):
+        """
+        Generate a new key.
+
+        @param address: The address bound to the key.
+        @type address: str
+        @return: The key bound to C{address}.
+        @rtype: EncryptionKey
+        """
+