android/app/src/com/android/bluetooth/btservice/bluetoothKeystore/BluetoothKeystoreNativeInterface.java

/*
 * 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.
 */

package com.android.bluetooth.btservice.bluetoothkeystore;

import android.util.Log;


import java.io.IOException;
import java.security.NoSuchAlgorithmException;

/** Native interface to be used by BluetoothKeystoreService */
public class BluetoothKeystoreNativeInterface {
    private static final String TAG = BluetoothKeystoreNativeInterface.class.getSimpleName();

    private BluetoothKeystoreService mBluetoothKeystoreService = null;

    static {
        classInitNative();
    }

    /**
     * Initializes the native interface.
     *
     * <p>priorities to configure.
     */
    public void init(BluetoothKeystoreService service) {
        mBluetoothKeystoreService = service;
        initNative();
    }

    /**
     * Cleanup the native interface.
     */
    public void cleanup() {
        cleanupNative();
        mBluetoothKeystoreService = null;
    }

    // Callbacks from the native stack back into the Java framework.
    // All callbacks are routed via the Service which will disambiguate which
    // state machine the message should be routed to.

    private void setEncryptKeyOrRemoveKeyCallback(String prefixString, String decryptedString) {
        final BluetoothKeystoreService service = mBluetoothKeystoreService;

        if (service == null) {
            Log.e(
                    TAG,
                    "setEncryptKeyOrRemoveKeyCallback: Event ignored, service not available: "
                            + prefixString);
            return;
        }

        try {
            service.setEncryptKeyOrRemoveKey(prefixString, decryptedString);
        } catch (InterruptedException e) {
            Log.e(TAG, "Interrupted while operating.");
        } catch (IOException e) {
            Log.e(TAG, "IO error while file operating.");
        } catch (NoSuchAlgorithmException e) {
            Log.e(TAG, "encrypt could not find the algorithm: SHA256");
        }
    }

    private String getKeyCallback(String prefixString) {
        final BluetoothKeystoreService service = mBluetoothKeystoreService;

        if (service == null) {
            Log.e(TAG, "getKeyCallback: Event ignored, service not available: " + prefixString);
            return null;
        }

        return service.getKey(prefixString);
    }

    // Native methods that call into the JNI interface
    private static native void classInitNative();
    private native void initNative();
    private native void cleanupNative();
}