Add attestation application id for key attestation
This patch adds functionality for gathering an application id
for the attestation of a key that is bound to an application
in the keystore.
Keystore gathers the information package name, package version,
and signing certificates of the calling app from the package manager.
It then DER encodes the information and appends it to attestation
parameters.
Bug: 22914603
Change-Id: I9fe1d8f97ee1dfa79284bcf751f86631c94d4174
diff --git a/keystore/keystore_attestation_id.h b/keystore/keystore_attestation_id.h
new file mode 100644
index 0000000..55d2c94
--- /dev/null
+++ b/keystore/keystore_attestation_id.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License 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.
+ */
+
+#ifndef KEYSTORE_KEYSTORE_ATTESTATION_ID_H_
+#define KEYSTORE_KEYSTORE_ATTESTATION_ID_H_
+
+#include <utils/Errors.h>
+#include <vector>
+
+namespace android {
+namespace security {
+
+/**
+ * Gathers the attestation id for the application determined by uid by querying the package manager
+ * As of this writing uids can be shared in android, which is why the asn.1 encoded result may
+ * contain more than one application attestation id.
+ *
+ * @returns .first the asn.1 encoded attestation application id if .second is NO_ERROR. If .second
+ * is not NO_ERROR the content of .first is undefined.
+ */
+std::pair<std::vector<uint8_t>, status_t> gather_attestation_application_id(uid_t uid);
+
+} // namespace security
+} // namespace android
+#endif // KEYSTORE_KEYSTORE_ATTESTATION_ID_H_