Keyring base API

src/aws_encryption_sdk/keyring/base.py

@@ -0,0 +1,42 @@
+# Copyright 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"). You
+# may not use this file except in compliance with the License. A copy of
+# the License is located at
+#
+# http://aws.amazon.com/apache2.0/
+#
+# or in the "license" file accompanying this file. This file is
+# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
+# ANY KIND, either express or implied. See the License for the specific
+# language governing permissions and limitations under the License.
+"""Base class interface for Keyrings."""
+
+
+class Keyring(object):
+    """Parent interface for Keyring classes."""
+
+    def on_encrypt(self, encryption_materials):
+        """Generates a data key and encrypts it using all wrapping keys the Keyring is associated with.
+
+        :param encryption_materials: Contains signing key, encryption context and algorithm suite
+                                    required to encrypt data key
+        :type : aws_encryption_sdk.materials_managers.EncryptionMaterials
+        :returns encryption_materials: Contains signing key, unencrypted data key, encrypted data keys,
+                                    encryption context and algorithm suite required to encrypt data key
+        :rtype : aws_encryption_sdk.materials_managers.EncryptionMaterials
+        :raises AttributeError: if encryption materials not available
+        """
+        raise NotImplementedError("Keyring does not implement on_encrypt function")
+
+    def on_decrypt(self, decryption_materials):
+        """Tries to decrypt one of the keys in the list of encrypted data keys using wrapping keys
+            the Keyring is associated with.
+
+        :param decryption_materials: Contains verification key, list of encrypted data keys.
+        :type : aws_encryption_sdk.materials_managers.DecryptionMaterials
+        :returns decryption_materials: Contains verification key, list of encrypted data keys and decrypted data key.
+        :rtype : aws_encryption_sdk.materials_managers.DecryptionMaterials
+        :raises AttributeError: if decryption materials not available
+        """
+        raise NotImplementedError("Keyring does not implement on_decrypt function")