Make Keystore2's crypto operations their own crate

This cleanly separates out the underlying C++ code and allows clients
to depend only on the safe wrapper.

Test: keystore2_crypto_test
Test: keystore2_crypto_test_rust
Change-Id: I730ebe22ac66287a5650a36b7aeb61c69172e0f8
diff --git a/keystore2/src/crypto/Android.bp b/keystore2/src/crypto/Android.bp
new file mode 100644
index 0000000..061cf9a
--- /dev/null
+++ b/keystore2/src/crypto/Android.bp
@@ -0,0 +1,84 @@
+// Copyright 2020, 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.
+
+rust_library {
+    name: "libkeystore2_crypto_rust",
+    crate_name: "keystore2_crypto",
+    srcs: ["lib.rs"],
+    rustlibs: [
+        "libkeystore2_crypto_bindgen",
+    ],
+    static_libs: ["libkeystore2_crypto"],
+    shared_libs: ["libcrypto"],
+}
+
+cc_library {
+    name: "libkeystore2_crypto",
+    srcs: [
+        "crypto.cpp",
+        "certificate_utils.cpp",
+    ],
+    export_include_dirs: ["include",],
+    shared_libs: [
+        "libcrypto",
+        "liblog",
+    ],
+}
+
+rust_bindgen {
+    name: "libkeystore2_crypto_bindgen",
+    wrapper_src: "crypto.hpp",
+    crate_name: "keystore2_crypto_bindgen",
+    source_stem: "bindings",
+    host_supported: true,
+}
+
+rust_test {
+    name: "keystore2_crypto_test_rust",
+    crate_name: "keystore2_crypto_test_rust",
+    srcs: ["lib.rs"],
+    test_suites: ["general-tests"],
+    auto_gen_config: true,
+    rustlibs: [
+        "libkeystore2_crypto_bindgen",
+        "libkeystore2_crypto_rust",
+    ],
+    static_libs: [
+        "libkeystore2_crypto",
+    ],
+    shared_libs: [
+        "libc++",
+        "libcrypto",
+	"liblog",
+    ],
+}
+
+cc_test {
+    cflags: [
+        "-Wall",
+        "-Werror",
+        "-Wextra",
+    ],
+    srcs: [
+        "tests/certificate_utils_test.cpp",
+        "tests/gtest_main.cpp",
+    ],
+    static_libs: [
+        "libkeystore2_crypto",
+    ],
+    shared_libs: [
+        "libcrypto",
+    ],
+    name: "keystore2_crypto_test",
+}