Added HIDL based software implementation of gatekeeper

This patch adds a HIDL based software implementation of gatekeeper based
on libgatekeeper.

Also adds OWNER files to the vts test and default implementation
directories.

Test: Manually tested in emulator. Changing passwords and login worked.
      VtsHalGatekeeperV1_0TargetTest
      gatekeeper-software-device-unit-tests
Change-Id: I632aeb6677640c133ec1b79e72568840adbc0550
diff --git a/gatekeeper/1.0/software/SoftGateKeeperDevice.h b/gatekeeper/1.0/software/SoftGateKeeperDevice.h
new file mode 100644
index 0000000..17b474e
--- /dev/null
+++ b/gatekeeper/1.0/software/SoftGateKeeperDevice.h
@@ -0,0 +1,80 @@
+/*
+ * Copyright 2015 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 SOFT_GATEKEEPER_DEVICE_H_
+#define SOFT_GATEKEEPER_DEVICE_H_
+
+#include <android/hardware/gatekeeper/1.0/IGatekeeper.h>
+#include <hidl/Status.h>
+
+#include <memory>
+#include "SoftGateKeeper.h"
+
+namespace android {
+
+/**
+ * Software based GateKeeper implementation
+ */
+class SoftGateKeeperDevice : public ::android::hardware::gatekeeper::V1_0::IGatekeeper {
+  public:
+    SoftGateKeeperDevice() { impl_.reset(new ::gatekeeper::SoftGateKeeper()); }
+
+    // Wrappers to translate the gatekeeper HAL API to the Kegyuard Messages API.
+
+    /**
+     * Enrolls password_payload, which should be derived from a user selected pin or password,
+     * with the authentication factor private key used only for enrolling authentication
+     * factor data.
+     *
+     * Returns: 0 on success or an error code less than 0 on error.
+     * On error, enrolled_password_handle will not be allocated.
+     */
+    ::android::hardware::Return<void> enroll(
+            uint32_t uid, const ::android::hardware::hidl_vec<uint8_t>& currentPasswordHandle,
+            const ::android::hardware::hidl_vec<uint8_t>& currentPassword,
+            const ::android::hardware::hidl_vec<uint8_t>& desiredPassword,
+            enroll_cb _hidl_cb) override;
+
+    /**
+     * Verifies provided_password matches enrolled_password_handle.
+     *
+     * Implementations of this module may retain the result of this call
+     * to attest to the recency of authentication.
+     *
+     * On success, writes the address of a verification token to auth_token,
+     * usable to attest password verification to other trusted services. Clients
+     * may pass NULL for this value.
+     *
+     * Returns: 0 on success or an error code less than 0 on error
+     * On error, verification token will not be allocated
+     */
+    ::android::hardware::Return<void> verify(
+            uint32_t uid, uint64_t challenge,
+            const ::android::hardware::hidl_vec<uint8_t>& enrolledPasswordHandle,
+            const ::android::hardware::hidl_vec<uint8_t>& providedPassword,
+            verify_cb _hidl_cb) override;
+
+    ::android::hardware::Return<void> deleteUser(uint32_t uid, deleteUser_cb _hidl_cb) override;
+
+    ::android::hardware::Return<void> deleteAllUsers(deleteAllUsers_cb _hidl_cb) override;
+
+  private:
+    std::unique_ptr<::gatekeeper::SoftGateKeeper> impl_;
+};
+
+}  // namespace android
+
+#endif  // SOFT_GATEKEEPER_DEVICE_H_