Make CBOR and COSE CTS utilities reusable

We need these utilities for tools, and they may prove handy for
production code. Move them into system/security and flesh out the
unit tests.

Test: IdCredSupportTests
Change-Id: I18dd909e46aec5e315adb4358dc23088d70fa899
diff --git a/identity/util/Android.bp b/identity/util/Android.bp
new file mode 100644
index 0000000..71d7718
--- /dev/null
+++ b/identity/util/Android.bp
@@ -0,0 +1,42 @@
+// Copyright 2021 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.
+
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+java_library {
+    name: "identity-credential-util",
+    srcs: [
+        "src/java/**/*.java",
+    ],
+    static_libs: [
+        "androidx.annotation_annotation",
+        "bouncycastle-unbundled",
+        "cbor-java",
+    ],
+}
+
+android_test {
+    name: "identity-credential-util-tests",
+    test_suites: ["general-tests"],
+    srcs: [
+        "test/java/**/*.java",
+    ],
+    static_libs: [
+        "androidx.test.rules",
+        "identity-credential-util",
+        "junit",
+    ],
+}